CN112741716B

CN112741716B - Multi-section stretching device

Info

Publication number: CN112741716B
Application number: CN201911040422.0A
Authority: CN
Inventors: 黄孟锋
Original assignee: Heshuo Biotech Co ltd
Current assignee: Heshuo Biotech Co ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2024-05-17
Anticipated expiration: 2039-10-29
Also published as: CN112741716A

Abstract

The invention provides a multi-section stretching device, which comprises a stretching module, a first pushing piece, a second pushing piece and a bolt, wherein the first pushing piece and the second pushing piece are arranged at the front end and the rear end of the stretching module, the bolt is screwed between the first sliding piece and the second sliding piece, the first sliding piece and the second sliding piece can be relatively close to each other by screwing the bolt so as to push the stretching module to generate a first section stretching and a second section stretching, the first section stretching is used for transversely stretching the stretching module, the second section stretching is carried out after the first section stretching to the maximum width, and the longitudinal stretching height of the stretching module can be adjusted, so that the stretching module can have larger width no matter how much distance between an upper vertebra and a lower vertebra bone joint is stretched, the stretching module has better supporting effect, and the bone joint contact surface can be prevented from being easily abraded and concave.

Description

Multi-section stretching device

Technical Field

The invention relates to the technical field of the structural aspect of an extension implant, in particular to a multi-section extension device which can ensure that the extension implant has larger width no matter how large the distance between an upper bone section and a lower bone section is extended, has better supporting effect and can prevent the contact surface of the bone section from being easily worn and recessed.

Background

At present, a micro channel is mainly established at an affected part in a minimally invasive operation of an intervertebral fusion operation, then an intervertebral fusion device with small volume is conveyed between upper and lower spinal condyles of the affected part by utilizing an endoscope or X-ray to assist, and then the intervertebral fusion device is longitudinally stretched to be propped against opposite end surfaces of the upper and lower spinal condyles so as to achieve the aim of clinical intervertebral fusion.

One prior art interbody fusion cage, as shown in U.S. US9,883,955B2 and US10,045,858B2, is capable of being expanded in one direction only, and after being longitudinally implanted between the upper and lower spinal levels, is capable of being expanded longitudinally to rest against the upper and lower spinal levels, and at this time, the end surfaces of the upper and lower spinal levels are easily worn by the upper and lower spinal levels to form depressions due to the very small contact area with the upper and lower spinal levels. After being implanted between the upper and lower spinal condyles, the bone segments can be transversely stretched and expanded to increase the contact area, so that the problem of abrasion and depression of the bone segments is solved, but the height of the bone segments cannot be adjusted due to fixation, so that once the distance between the upper and lower spinal condyles of a patient is large, the bone segments cannot be blocked against the opposite end surfaces of the upper and lower spinal condyles, and the aim of intervertebral fusion is lost.

Another prior art interbody fusion cage, as shown in us US8,864,833B2 and US10,098,758B2, can be stretched both longitudinally and laterally, but the height requirement for the longitudinal stretching of the opposite interbody fusion cage is different for each individual body size, illness state and illness part, so that when the interbody fusion cage is implanted between the upper and lower spinal condyles requiring a greater longitudinal stretching height, the interbody fusion cage can be stretched both longitudinally and laterally to a greater extent, without the problem that the end faces of the condyles are easily worn by the condyles to form depressions. However, when the implant is implanted between the upper and lower spinal segments requiring a smaller height of longitudinal extension, the longitudinal extension distance is limited to be only small or even not, and the transverse extension distance is simultaneously linked with the longitudinal extension distance, so that the opposite transverse extension distance is also relatively small or not, and at the moment, the problem that the end surfaces of the segments are easily worn by the segments to form depressions due to insufficient width still exists, which is similar to a dummy. Furthermore, the stretching in the longitudinal direction and the stretching in the transverse direction are performed simultaneously, and the operation resistance is relatively high, so that the problems of poor smoothness, labor saving and the like are also caused.

Disclosure of Invention

The invention aims to provide a multi-section stretching device which solves the technical problems in the prior art.

In order to achieve the above purpose, the invention adopts the following technical scheme:

A multi-segment stent device, comprising:

a stretching module capable of producing longitudinal stretching and transverse stretching;

the first pushing piece is arranged at the front end of the stretching module and is internally provided with a screw hole;

The second pushing piece is arranged at the rear end of the stretching module and is internally provided with a through hole; and

The bolt is provided with a screw rod part and a head part, the screw rod part passes through the through hole of the second pushing piece and is screwed in the screw hole of the first pushing piece, the head part is propped against one side of the second pushing piece opposite to the first pushing piece, the bolt is screwed to enable the first pushing piece and the second pushing piece to be relatively close to each other so as to push the stretching module to generate a first stretch and a second stretch, the first stretch enables the stretching module to transversely stretch to be wide, and the second stretch is carried out after the first stretch reaches the maximum transverse stretch width, so that the longitudinal stretching height of the stretching module can be adjusted.

The multi-section stretching device comprises: the stretching module comprises a first stretching block, a second stretching block, a third stretching block, a fourth stretching block, a first guide block, a second guide block, a third guide block and a fourth guide block, wherein the second stretching block is positioned at the lower side of the first stretching block, the third stretching block is positioned at the left side of the first stretching block, the fourth stretching block is positioned at the lower side of the third stretching block, the first guide block is slidably embedded at the front end surfaces of the first stretching block and the second stretching block, the second guide block is slidably embedded at the rear end surfaces of the first stretching block and the second stretching block, the first stretching block and the second stretching block can be vertically stretched by being vertically and horizontally displaced between the first guide block and the second guide block, the third guide block is slidably embedded at the front end surfaces of the third stretching block and the fourth stretching block, the fourth stretching block is enabled to be vertically displaced between the third stretching block and the fourth stretching block, the first stretching block and the fourth stretching block is enabled to be vertically displaced between the first stretching block and the second stretching block and the fourth stretching block, the first stretching block and the fourth stretching block is enabled to be horizontally displaced between the front end surfaces of the first stretching block and the fourth stretching block.

The multi-section stretching device comprises:

the front and rear ends of the first stretching block are respectively formed with two first inclined planes inclined from bottom to top outwards;

the front end and the rear end of the second stretching block respectively form two second inclined planes which incline outwards from top to bottom;

the front end and the rear end of the third stretching block respectively form two third inclined planes which incline from bottom to top outwards;

the front end and the rear end of the fourth stretching block respectively form a fourth inclined plane which is inclined outwards from top to bottom;

The rear end of the first guide block is provided with a first upper inclined plane and a first lower inclined plane which respectively correspond to the first inclined plane and the second inclined plane of the front end, and the front end of the first guide block is provided with a first front inclined plane which is inclined outwards from back to front;

the front end of the second guide block is provided with a second upper inclined plane and a second lower inclined plane which respectively correspond to the first inclined plane and the second inclined plane at the rear end, and the rear end of the second guide block is provided with a second rear inclined plane which is inclined outwards from front to rear;

the rear end of the third guide block is provided with a third upper inclined plane and a third lower inclined plane which respectively correspond to the third inclined plane and the fourth inclined plane of the front end, and the front end of the third guide block is provided with a third front inclined plane which is inclined outwards from back to front;

The front end of the fourth guide block is provided with a fourth upper inclined plane and a fourth lower inclined plane which respectively correspond to the third inclined plane and the fourth inclined plane at the rear end, and the rear end of the fourth guide block is provided with a fourth rear inclined plane which is inclined outwards from front to back;

Two sides of the first pushing piece are provided with two first pushing piece inclined planes corresponding to the first front inclined planes and the third front inclined planes;

two sides of the second pushing piece are provided with two second pushing piece inclined planes corresponding to the second inclined plane and the fourth inclined plane;

Wherein, between the two first inclined planes and the first upper inclined planes and the first lower inclined planes, between the two second inclined planes and the first lower inclined planes and the second lower inclined planes, between the two third inclined planes and the third upper inclined planes and the fourth upper inclined planes, between the two fourth inclined planes and the third lower inclined planes and the fourth lower inclined planes, and between the two first pushing piece inclined planes and the first front inclined planes and the third front inclined planes, and between the two second pushing piece inclined planes and the second rear inclined planes are respectively provided with concave-convex buckle group structures which can be correspondingly and slidably embedded.

The multi-section stretching device comprises: the two first inclined planes are respectively provided with two first inclined plane guide rails, the two second inclined planes are respectively provided with two second inclined plane guide rails, the two third inclined planes are respectively provided with two third inclined plane guide rails, the two fourth inclined planes are respectively provided with two fourth inclined plane guide rails, the first upper inclined plane is provided with a first upper dovetail groove for the first inclined plane guide rails of the front end to slide and insert therein, the first lower inclined plane is provided with a first lower dovetail groove for the second inclined plane guide rails of the front end to slide and insert therein, the first front inclined plane is provided with a first front dovetail groove, the second upper inclined plane is provided with a second upper dovetail groove for the first inclined plane guide rails of the rear end to slide and insert therein, the second lower inclined plane is provided with a second lower dovetail groove for the second inclined plane guide rails of the rear end to slide and insert therein, the third upper inclined plane is provided with a third upper dovetail groove for the sliding embedding of the third inclined plane guide rail at the front end, the third lower inclined plane is provided with a third lower dovetail groove for the sliding embedding of the fourth inclined plane guide rail at the front end, the third front inclined plane is provided with a third front dovetail groove, the fourth upper inclined plane is provided with a fourth upper dovetail groove for the sliding embedding of the third inclined plane guide rail at the rear end, the fourth lower inclined plane is provided with a fourth lower dovetail groove for the sliding embedding of the fourth inclined plane guide rail at the rear end, the fourth rear inclined plane is provided with a fourth rear dovetail groove, the two first pushing piece guide rails are respectively arranged on the two first pushing piece inclined planes for the sliding embedding of the first front dovetail groove and the third front dovetail groove, and the two second pushing piece guide rails are respectively arranged on the two second pushing piece inclined planes for the sliding embedding of the second dovetail groove and the fourth dovetail groove.

The multi-section stretching device comprises: the lower end of the first front inclined surface is convexly provided with two first front stop blocks, the lower end of the second rear inclined surface is convexly provided with two second rear stop blocks, the rear lower end of the third front inclined surface is convexly provided with two third front stop blocks, the lower end of the fourth rear inclined surface is convexly provided with two fourth rear stop blocks, the upper side surface and the lower side surface of the first pushing piece are respectively provided with two first stop surfaces, the upper side surface and the lower side surface of the second pushing piece are respectively provided with two second stop surfaces, and the two first stop surfaces and the two second stop surfaces can be blocked by the two first front stop blocks, the two third front stop blocks, the two second rear stop blocks and the two fourth rear stop blocks respectively, so that the transverse stretching can not be continued any more, and the limit width of the first section stretching can be reached.

The multi-section stretching device comprises: the rear side of the first pushing piece is convexly extended with a sleeve rod, and the screw hole is arranged in the sleeve rod.

The multi-section stretching device comprises: one end of the loop bar is combined with the first pushing piece in a threaded mode.

The multi-section stretching device comprises: the bottom surface of the first stretching block is provided with a plurality of first guide blocks and a plurality of first guide grooves which are arranged in a staggered way and are trapezoidal, the top surface of the second stretching block is provided with a plurality of second guide grooves and a plurality of second guide blocks which can be correspondingly embedded with the plurality of first guide blocks and the plurality of first guide grooves in an up-and-down sliding way, the bottom surface of the third stretching block is provided with a plurality of third guide blocks and a plurality of third guide grooves which are arranged in a staggered way and are trapezoidal, and the top surface of the fourth stretching block is provided with a plurality of fourth guide grooves and a plurality of fourth guide blocks which can be correspondingly embedded with the plurality of third guide blocks and the plurality of third guide grooves in an up-and-down sliding way.

The multi-section stretching device comprises: the first front dovetail groove, the second rear dovetail groove, the third front dovetail groove and the fourth rear dovetail groove are respectively provided with a limit guide groove, one end of each limit guide groove is open, the other end of each limit guide groove forms a limit stop surface, one ends of the two first pushing piece guide rails and the two second pushing piece guide rails are respectively provided with a convex part in a protruding mode, the four convex parts can slide in the four-pole limit guide grooves respectively, and the four convex parts can be blocked by the limit stop surfaces of the four-pole limit guide grooves respectively, so that the transverse stretching can not be continued any more, and the limit width of the first stretch is further reached.

The multi-section stretching device comprises: the first upper dovetail groove, the first lower dovetail groove, the second upper dovetail groove, the second lower dovetail groove, the third upper dovetail groove, the third lower dovetail groove, the fourth upper dovetail groove and the fourth lower dovetail groove are respectively provided with a limiting guide groove, one end of each limiting guide groove is in an opening shape, the other end of each limiting guide groove forms a clamping surface, one clamping part is respectively arranged at one ends of each of the two first inclined guide rails, the two second inclined guide rails, the two third inclined guide rails and the two fourth guide rails in a protruding mode, eight clamping parts can slide in the eight limiting guide grooves respectively, and the clamping surfaces of the eight limiting guide grooves can block the eight clamping parts, so that the first, second, third and fourth stretching blocks can not be easily separated from the first, second, third and fourth guide blocks when the edge is stretched.

The multi-section stretching device comprises: the device also comprises two guide structures which are respectively arranged between the first stretching block and the third stretching block and between the second stretching block and the fourth stretching block, and can assist the smooth synchronous displacement of the first stretching block, the third stretching block, the second stretching block and the fourth stretching block during stretching.

The multi-section stretching device comprises: the two guide structures comprise a plurality of guide holes and two guide pieces, wherein the guide holes and the two guide pieces respectively transversely penetrate through the first stretching block, the second stretching block, the third stretching block and the fourth stretching block, the two guide pieces are respectively and correspondingly arranged between the first stretching block, the third stretching block and the second stretching block and the fourth stretching block, each guide piece comprises at least one guide rod, and two ends of each guide rod are respectively and telescopically inserted into the corresponding two guide holes.

The multi-section stretching device comprises: the two guide structures comprise a plurality of guide holes and two guide pieces, wherein the guide holes and the two guide pieces respectively transversely penetrate through the first stretching block, the second stretching block, the third stretching block and the fourth stretching block, the two guide pieces are respectively and correspondingly arranged between the first stretching block, the third stretching block and the second stretching block, each guide piece comprises two parallel guide rods and a connecting rod connected with the centers of the two guide rods, and two ends of the two guide rods of the two guide pieces are respectively and telescopically inserted into the corresponding plurality of guide holes.

The multi-section stretching device comprises: the first stretching block, the second stretching block, the third stretching block and the fourth stretching block respectively comprise a front block and a rear block, and the corresponding front block and the rear block are in sliding connection through corresponding inclined connection surfaces, so that the plurality of front blocks and the plurality of rear blocks can be matched with the unevenness of the opposite surfaces of the upper bone section and the lower bone section to sequentially form longitudinal two-section stretching.

The multi-section stretching device comprises: the two corresponding inclined joint surfaces are respectively provided with a dovetail groove and a guide rail which are correspondingly and slidably embedded.

The multi-section stretching device provided by the invention can stretch the first section to the maximum width and stretch the second section to adjust the height, so that the device can stretch the first section to the maximum width to have a larger contact area no matter how high the first section is stretched between the upper vertebra and the lower vertebra, and has a better supporting effect, and can avoid the joint contact surface from being easily worn and recessed, so that the single specification is very suitable for the joint gaps of different statures, different illness states and different diseased positions. In addition, the two-stage stretching can greatly reduce the operation resistance, thereby increasing the smoothness and saving more labor.

Drawings

Fig. 1 is an exploded perspective view of a first embodiment of the present invention.

Fig. 2 is an exploded perspective view of the other side of the first embodiment of the present invention.

Fig. 3 is an enlarged schematic view of a three-dimensional combination of the first embodiment of the present invention.

Fig. 4 is a top view of fig. 3.

Fig. 5 is a front view of fig. 3.

Fig. 6 is a right side view of fig. 3.

Fig. 7 is a schematic view of section A-A of fig. 5.

Fig. 8 is a schematic view of section B-B of fig. 5.

Fig. 9 is a schematic perspective view of the first embodiment of the present invention when the first section is extended.

Fig. 10 is a schematic diagram showing a front view of the first embodiment of the present invention when the first section is extended.

Fig. 11 is an enlarged schematic view of section C-C of fig. 10.

Fig. 12 is a schematic perspective view of the second stage of the first embodiment of the present invention when extended.

Fig. 13 is a schematic diagram showing a front view of the second section of the first embodiment of the present invention when it is extended.

Fig. 14 is an enlarged schematic view of section D-D of fig. 13.

Fig. 15 is an exploded perspective view of a second embodiment of the present invention.

Fig. 16 is an exploded perspective view of the other side of the second embodiment of the present invention.

FIG. 17 is an enlarged perspective view of a second embodiment of the present invention in a fully condensed state.

Fig. 18 is an enlarged perspective view of the second embodiment of the present invention with the first section extended to the limit.

Fig. 19 is an enlarged perspective view of the second embodiment of the present invention in a fully extended state.

FIG. 20 is a schematic cross-sectional view of the second embodiment of the present invention with the first section extended to the limit.

Fig. 21 is an action schematic diagram of a limit structure according to a second embodiment of the present invention.

Fig. 22 is a schematic diagram illustrating the operation of the guiding structure according to the second embodiment of the present invention.

Fig. 23 is an exploded perspective view of a third embodiment of the present invention.

Fig. 24 is a partially exploded perspective enlarged schematic view of a fourth embodiment of the present invention.

Fig. 25 is an enlarged perspective view of a longitudinal two-stage stretched state of a fourth embodiment of the present invention.

Fig. 26 is a schematic view showing an embodiment of longitudinal two-stage stretching according to the fourth embodiment of the present invention.

Fig. 27 is a schematic illustration of the invention applied within a bone.

Reference numerals illustrate: 10 stretching modules; 11a first stretching block; 110a first incline; 111 a first beveled guide rail; 112 a first guide block; 113 a first guide slot; a second stretching block 12; 120 a second bevel; 121. a second inclined guide rail; 122 a second guide slot; 123 second guide blocks; 13 a third stretching block; 130 a third ramp; 131 a third bevel rail; 132 a third guide block; 133 a third guide groove; 14 fourth stretching block; 140. a fourth inclined surface; 141 a fourth ramp rail; 142 fourth guide grooves; 143 a fourth guide block; 15 first guide blocks; 150 a first upper incline; 151 first lower inclined surface; 152 a first upper dovetail slot; 153 first lower dovetail slot; 154. a first front bevel; 155 a first forward dovetail slot; 156 a first positive stop; 16 a second guide block; 160 a second upper incline; 161 a second lower ramp; 162 a second upper dovetail slot; 163 second lower dovetail slot; 164 a second rear ramp; 165 a second rear dovetail slot; 166 a second rear stop; 17 a third guide block; 170 a third upper incline; 171 a third lower incline; 172 third upper dovetail slot; 173 third lower dovetail slot; 174 a third front bevel; 175 a third front dovetail slot; 176 a third positive stop; 18 a fourth guide block; 180 a fourth upper incline; 181 a fourth lower incline; 182. a fourth upper dovetail slot; 183 fourth lower dovetail slot; 184 a fourth rear incline; 185 fourth rear dovetail slot; 186. a fourth rear stopper; 20a first pusher; 21 loop bars; a 22 screw hole; 23a first pusher ramp; 24 a first pusher guide rail; 25 a first stop surface; 30 a second pusher; 31 perforating; 32 a second pusher ramp; 33 a second pusher guide rail; 34 a second stop surface; a 40 bolt; 41 screw section; 42 head; 50 upper condyle; 51 inferior condyle; 60 limit guide slots; 61 limit stop surfaces; 62 convex parts; 70 limiting guide grooves; 71 locking surfaces; 72 a clamping part; 80. a guide structure; 81 guide holes; 810 flanges; 82 guides; 820 guide rods; 821 link; 822 an expansion head; a front block; a1, a miter joint surface; a2, a guide rail; b, a rear block; b1 miter joint; b2 dovetail slots.

Detailed Description

Fig. 1-14 illustrate a first embodiment of the two-stage expansion interbody fusion cage of the present invention.

Referring to fig. 1 to 8, the multi-stage stretching device of the present invention includes a stretching module 10, a first pushing member 20, a second pushing member 30 and a bolt 40, wherein:

The stretching module 10 can generate longitudinal stretching and transverse stretching;

the first pushing member 20 is disposed at the front end of the stretching module 10, and a sleeve rod 21 protrudes from the rear side of the first pushing member 20, and a screw hole 22 is formed in the sleeve rod 21;

The second pushing member 30 is disposed at the rear end of the stretching module 10, and has a through hole 31 therein;

The bolt 40 has a threaded portion 41 and a head 42 with a larger outer diameter, the threaded portion 41 passes through the through hole 31 of the second pushing member 30 and is screwed into the screw hole 22 of the first pushing member 20, and the head 42 abuts against a side of the second pushing member 30 opposite to the first pushing member 20.

Referring to fig. 3, 9 and 12, the bolt 40 is locked to enable the first pushing member 20 and the second pushing member 30 to be relatively close to push the stretching module 10 to generate a first stretch and a second stretch, wherein the first stretch enables the stretching module 10 to stretch laterally, and the second stretch is performed after the first stretch reaches the maximum width, so as to adjust the longitudinal stretching height of the stretching module 10 as required.

The stretching module 10 comprises a first stretching block 11, a second stretching block 12, a third stretching block 13, a fourth stretching block 14, a first guiding block 15, a second guiding block 16, a third guiding block 17 and a fourth guiding block 18, wherein:

The first stretching block 11 has a plurality of protruding teeth formed on its top surface, two first inclined surfaces 110 inclined from bottom to top are formed at the front and rear ends, two first inclined surface guide rails 111 are respectively disposed on the two first inclined surfaces 110, and a plurality of first guide blocks 112 and a plurality of first guide grooves 113 are disposed on the bottom surface in a staggered manner and are trapezoidal.

The second stretching block 12 is located at the lower side of the first stretching block 11, the bottom surface forms a plurality of convex teeth, the front and rear ends respectively form two second inclined planes 120 inclined from top to bottom outwards, two second inclined plane guide rails 121 are respectively arranged on the two second inclined planes 120, and the top surface is provided with a plurality of second guide grooves 122 and a plurality of second guide blocks 123 which can be correspondingly and vertically slid and embedded with the plurality of first guide blocks 112 and the plurality of first guide grooves 113.

The third stretching block 13 is located at the left side of the first stretching block 11, the top surface forms a plurality of convex teeth, the front end and the rear end form two third inclined surfaces 130 inclined from bottom to top outwards respectively, two third inclined surface guide rails 131 are respectively arranged on the two third inclined surfaces 130, and the bottom surface is provided with a plurality of third guide blocks 132 and a plurality of third guide grooves 133 which are staggered and trapezoidal.

The fourth stretching block 14 is located at the lower side of the third stretching block 13, the bottom surface forms a plurality of convex teeth, the front and rear ends form two fourth inclined planes 140 inclined from top to bottom outwards respectively, two fourth inclined plane guide rails 141 are respectively arranged on the two fourth inclined planes 140, and the top surface is provided with a plurality of fourth guide grooves 142 and a plurality of fourth guide blocks 143 which can be correspondingly and vertically slid and embedded with the plurality of third guide blocks 132 and the plurality of third guide grooves 133.

The first guide block 15 is disposed on the front end surfaces of the first and second stretching blocks 11 and 12, a first upper inclined surface 150 and a first lower inclined surface 151 corresponding to the first and second inclined surfaces 110 and 120 of the front end are formed at the rear end, a first upper dovetail groove 152 is disposed on the first upper inclined surface 150 for sliding the first inclined surface guide rail 111 of the front end into the first upper inclined surface, a first lower dovetail groove 153 is disposed on the first lower inclined surface 151 for sliding the second inclined surface guide rail 121 of the front end into the first lower inclined surface guide rail, a first front inclined surface 154 inclined from rear to front to outside is formed at the front end of the first guide block 15, and a first front dovetail groove 155 is disposed on the first front inclined surface 154. Two first front stoppers 156 are disposed at the lower end of the first front inclined surface 154.

The second guide block 16 is disposed on the rear end surfaces of the first and second stretching blocks 11 and 12, a second upper inclined surface 160 and a second lower inclined surface 161 are formed at the front ends thereof, which correspond to the first and second inclined surfaces 110 and 120 at the rear ends respectively, a second upper dovetail groove 162 is disposed on the second upper inclined surface 160 for sliding the first inclined surface guide rail 111 at the rear end therein, a second lower dovetail groove 163 is disposed on the second lower inclined surface 161 for sliding the second inclined surface guide rail 121 at the rear end therein, a second rear inclined surface 164 inclined from front to rear outwards is formed at the rear end of the second guide block 16, and a second rear dovetail groove 165 is disposed on the second rear inclined surface 164. Two second rear stoppers 166 are disposed at the lower end of the second rear inclined surface 164.

The third guide block 17 is disposed on the front end surfaces of the third and fourth stretching blocks 13 and 14, a third upper inclined surface 170 and a third lower inclined surface 171 are formed at the rear ends thereof, which correspond to the third and fourth inclined surfaces 130 and 140 at the front ends respectively, a third upper dovetail groove 172 is disposed on the third upper inclined surface 170 for sliding and embedding the third inclined surface guide rail 131 at the front end therein, a third lower dovetail groove 173 is disposed on the third lower inclined surface 171 for sliding and embedding the fourth inclined surface guide rail 141 at the front end therein, a third front inclined surface 174 inclined from rear to front to outside is formed at the front end of the third guide block 17, and a third front dovetail groove 175 is disposed on the third front inclined surface 174. Two third front stoppers 176 are protruded at the lower end of the third front inclined surface 174.

The fourth guide block 18 is disposed on the rear end surfaces of the third and fourth stretching blocks 13 and 14, a fourth upper inclined surface 180 and a fourth lower inclined surface 181 corresponding to the third and fourth inclined surfaces 130 and 140 respectively are formed at the front end, a fourth upper dovetail slot 182 is disposed on the fourth upper inclined surface 180 for sliding the third inclined surface guide rail 131 at the rear end into the fourth upper inclined surface 180, a fourth lower dovetail slot 183 is disposed on the fourth lower inclined surface 181 for sliding the fourth inclined surface guide rail 141 at the rear end into the fourth lower inclined surface guide rail 181, a fourth rear inclined surface 184 inclined from front to rear to outside is formed at the rear end of the fourth guide block 18, and a fourth rear dovetail slot 185 is disposed on the fourth rear inclined surface 184. Two fourth rear stoppers 186 are protruded from the lower end of the fourth rear inclined surface 184.

The first pushing member 20 has two first pushing member inclined planes 23 corresponding to the first and third front inclined planes 154, 174 on both sides, and two first pushing member guide rails 24 are respectively provided on the two first pushing member inclined planes 23 for sliding and embedding in the first and third front dovetail grooves 155, 175, respectively. Two first stop surfaces 25 are respectively disposed on the upper and lower sides of the first pushing member 20.

The second pushing member 30 has two second pushing member inclined surfaces 32 corresponding to the second and fourth rear inclined surfaces 164, 184 on both sides, and two second pushing member guide rails 33 are respectively provided on the two second pushing member inclined surfaces 32 for sliding and embedding in the second and fourth rear dovetail grooves 165, 185, respectively. Two second stop surfaces 34 are respectively disposed on the upper and lower sides of the second pushing member 30.

Referring to fig. 9-11, the multi-stage stretching device according to the present invention performs a first stage stretching operation, wherein when the bolt 40 is screwed, the first and second stretching blocks 20, 30 are relatively close to push the first, second, third and fourth guiding blocks 15, 16, 17 and 18 synchronously, so that the first, second and third guiding blocks 15, 16 and 17, 18 slide along the two first and second stretching inclined surfaces 23, 32 of the first and second stretching blocks 20, 30 respectively, so that the first, second guiding blocks 15, 16 and the third and fourth guiding blocks 17, 18 drive the first, second stretching blocks 11, 12 and the third and fourth stretching blocks 13, 14 to stretch laterally between the first and second stretching blocks 20, 30 to expand the width.

Referring to fig. 12-14, the second stretching operation of the multi-stage stretching device according to the present invention is to be noted, wherein when the two first stop surfaces 25 and the two second stop surfaces 34 are blocked by the two first front stops 156, the two third front stops 176, the two second rear stops 166, and the two fourth rear stops 186, respectively, the first stretching blocks 11, 12 and the third stretching blocks 13, 14 between the first pushing member 20 and the second pushing member 30 can not be stretched laterally any further, and are stretched laterally to the maximum width (this is the limit width of the first stretching). Then, the bolt 40 is further tightened, the first and second stretching blocks 11 and 12 are displaced along the first upper inclined plane 150 and the first lower inclined plane 151 of the first guide block 15 and the second upper inclined plane 160 and the second lower inclined plane 161 of the second guide block 16 to form longitudinal stretching, and the third and fourth stretching blocks 13 and 14 are displaced along the third upper inclined plane 170 and the third lower inclined plane 171 of the third guide block 17 and the fourth upper inclined plane 180 and the fourth lower inclined plane 181 of the fourth guide block 18 to form longitudinal stretching, so that the purpose of adjusting the height to prop against an upper condyle 50 and a lower condyle 51 is achieved.

The multi-section stretching device provided by the invention is characterized in that the first section stretching is firstly carried out to enable the first section stretching to be transversely stretched to the maximum width, and then the second section stretching is carried out to enable the second section stretching to be longitudinally stretched to adjust the height, so that the multi-section stretching device can transversely stretch to the maximum width to have a larger contact area no matter how high the upper vertebra and the lower vertebra are stretched, has a better supporting effect, can prevent the joint contact surface from being easily abraded and recessed, and is very suitable for joint gaps of different statures, different conditions and different diseased positions. In addition, the two-stage stretching can greatly reduce the operation resistance, thereby increasing the smoothness and saving more labor.

Referring to fig. 15 to 22, a second embodiment of the multi-stage stretching device according to the present invention has the same structure as the first embodiment, and the following differences are provided:

(1) One end of the loop bar 21 of the present embodiment is coupled to the first pushing member 20 in a threaded manner.

(2) The present embodiment does not utilize the two first stop surfaces 25 and the two second stop surfaces 34 of the first embodiment to be blocked by the two first front stops 156, the two third front stops 176, the two second rear stops 166, the two fourth rear stops 186, respectively, as the limit of the first extension, thereby creating the condition for performing the second extension. Instead, in this embodiment, each of the groove bottoms of the first front dovetail groove 155, the first rear dovetail groove 165, the third front dovetail groove 175 and the fourth rear dovetail groove 185 has a limiting guide groove 60, and one end of the limiting guide groove 60 is open, and the other end forms a limiting stop surface 61. A protrusion 62 is protruded at one end of each of the two first pushing member rails 24 and the two second pushing member rails 33, so that the four protrusions 62 can slide in the four-pole limiting guide grooves 60. Referring to fig. 18 and 20, when the bolt 40 is screwed until the four protrusions 62 are respectively blocked by the limit blocking surfaces 61 of the four-pole limit guide groove 60, the first and second stretching blocks 11, 12 and the third and fourth stretching blocks 13, 14 between the first and second sliding blocks 20, 30 cannot continue to stretch laterally, and are stretched laterally to the maximum width (this is the limit width of the first stretch). Then, when the bolt 40 is further tightened, the first and second stretching blocks 11 and 12 are displaced along the first upper inclined surface 150 and the first lower inclined surface 151 of the first guide block 15 and the second upper inclined surface 160 and the second lower inclined surface 161 of the second guide block 16 to form longitudinal stretching, and the third and fourth stretching blocks 13 and 14 are displaced along the third upper inclined surface 170 and the third lower inclined surface 171 of the third guide block 17 and the fourth upper inclined surface 180 and the fourth lower inclined surface 181 of the fourth guide block 18 to form longitudinal stretching, so as to form longitudinal stretching of the second section.

(3) In this embodiment, a limiting guide groove 70 is respectively disposed on the bottom surfaces of the first upper dovetail groove 152, the first lower dovetail groove 153, the second upper dovetail groove 162, the second lower dovetail groove 163, the third upper dovetail groove 172, the third lower dovetail groove 173, the fourth upper dovetail groove 182 and the fourth lower dovetail groove 183, and one end of the limiting guide groove 70 is opened, and the other end forms a locking surface 71. One end of each of the two first inclined guide rails 111, the two second inclined guide rails 121, the two third inclined guide rails 131 and the two fourth guide rails 141 is provided with a clamping portion 72, the eight clamping portion 72 can slide in the eight limiting guide groove 70 respectively, and the eight clamping portion 72 can be blocked by the clamping surface 71 of the eight limiting guide groove 70 so as to prevent the first, second, third and fourth stretching blocks 11, 12, 13 and 14 from separating from the first, second, third and fourth guide blocks 15, 16, 17 and 18 during longitudinal stretching (as shown in fig. 21, the limiting action is illustrated by the third inclined guide rail 131 and the fourth upper dovetail groove 182 in fig. 21, and the limiting actions of other relative positions are the same and are not illustrated).

(4) In this embodiment, two guiding structures 80 are respectively disposed between the first and third stretching blocks 11, 13 and between the second and fourth stretching blocks 12, 14, and the two guiding structures 80 can assist the smooth synchronous displacement of the first and third stretching blocks 11, 13 and the second and fourth stretching blocks 12, 14 during the longitudinal stretching. Referring to fig. 22, the two guide structures 80 include a plurality of guide holes 81 (two illustrated in this embodiment) and two guide members 82 that extend transversely through the first, second, third and fourth stretching blocks 11, respectively. The inner ends of the plurality of guide holes 81 each have a flange 810 of smaller inner diameter. The two guide members 82 are respectively disposed between the first and third stretching blocks 11 and 13 and between the second and fourth stretching blocks 12 and 14, each guide member 82 includes two parallel guide rods 820 and a connecting rod 821 connecting the centers of the two guide rods 820, and two ends of the two guide rods 820 of the two guide members 82 are respectively inserted into the plurality of guide holes 81 in a telescopic manner, two ends of each guide rod 820 are respectively provided with two expansion heads 822 with larger outer diameters and capable of being elastically contracted, and the expansion heads 822 can facilitate the guide rods 820 to penetrate into the guide holes 81 and can be blocked by the flanges 810 to prevent the guide rods 820 from being easily separated from the guide holes 81. Thus, when stretching transversely, the first stretching blocks 11, 13 and the second stretching blocks 12, 14 can be smoothly translated by the two guiding structures 80, respectively, and when stretching longitudinally, the first stretching blocks 11, 13 and the second stretching blocks 12, 14 can be smoothly and synchronously moved up and down by the two guiding structures 80, respectively.

Referring to fig. 23, a third embodiment of the multi-stage stretching device according to the present invention has a structure substantially the same as that of the second embodiment, and the difference is that the two guiding members 82 of the present invention only include two guiding rods 820, respectively, and no connecting rod 821. In this embodiment, the two guiding elements 82 may also include only one, three or more guiding rods 820, respectively, which are simply increased or decreased, so that they will not be further described.

Referring to fig. 24 to 26, a fourth embodiment of the multi-stage stretching apparatus according to the present invention has a structure substantially the same as that of the third embodiment, and the difference is that the first stretching block 11, the second stretching block 12, the third stretching block 13 and the fourth stretching block 14 of the present embodiment respectively comprise a front block a and a rear block b. The corresponding front block a and the corresponding rear block b are connected in a sliding way through corresponding inclined joint surfaces a1 and b1, and corresponding dovetail grooves b2 and guide rails a2 which are correspondingly and slidably embedded are respectively arranged on the corresponding inclined joint surfaces a1 and b1, so that the plurality of front blocks a and the plurality of rear blocks b can be matched with the unevenness of the opposite surfaces of the upper and lower condyles 50 and 51 to form two-section stretching in sequence during longitudinal stretching, and the upper side surfaces and the lower side surfaces of the first stretching block 11, the second stretching block 12, the third stretching block 13 and the fourth stretching block 14 can be correspondingly adjusted to be matched with the shape, the height or the angle of the opposite surfaces of the upper and lower condyles 50 and 51 to obtain good and stable support, and can be further suitable for different conditions.

In the present invention, the first upper dovetail groove 152 and the first inclined guide 111, the first lower dovetail groove 153 and the second inclined guide 121, the second upper dovetail groove 162 and the first inclined guide 111, the second lower dovetail groove 163 and the second inclined guide 121, the third upper dovetail groove 172 and the third inclined guide 131, the third lower dovetail groove 173 and the fourth inclined guide 141, the fourth upper dovetail groove 182 and the third inclined guide 131, the fourth lower dovetail groove 183 and the fourth inclined guide 141, the first and third front dovetail grooves 155 and 175 and the two first push guides 24, the second and fourth rear dovetail grooves 165 and 185 and the two second push guides 33 and the dovetail groove b2 and the guide a2 may be other concave-convex buckle structures capable of being correspondingly slid.

Referring to fig. 27, it is pointed out that the multi-stage stretching device of the present invention can also be applied to bones (such as the vertebral body of the vertebra) for reduction or repair of fracture recesses, but it can also be applied to other relevant parts such as the vertebrae, the bones or the soft tissues (such as reduction or repair of facial recesses) … …, and the materials thereof can be different according to the application positions, for example, metal, polymer materials, PE, silica gel … …, etc.; the transverse implantation or the longitudinal implantation can achieve a plurality of effects and application ranges.

Claims

1. A multi-segment stent device, comprising:

A bolt having a screw portion and a head portion, the screw portion passing through the through hole of the second pushing member and being screwed into the screw hole of the first pushing member, the head portion being abutted against one side of the second pushing member opposite to the first pushing member, tightening the bolt can cause the first pushing piece and the second pushing piece to be relatively close to push the stretching module to generate a first section stretching and a second section stretching, wherein the first section stretching enables the stretching module to transversely stretch to a width, and the second section stretching is performed after the first section stretching to a maximum transverse stretching width, so that the longitudinal stretching height of the stretching module can be adjusted;

The stretching module comprises a first stretching block, a second stretching block, a third stretching block, a fourth stretching block, a first guide block, a second guide block, a third guide block and a fourth guide block, wherein the second stretching block is positioned at the lower side of the first stretching block, the third stretching block is positioned at the left side of the first stretching block, the fourth stretching block is positioned at the lower side of the third stretching block, the first guide block is slidably embedded at the front end surfaces of the first stretching block and the second stretching block, the second guide block is slidably embedded at the rear end surfaces of the first stretching block and the second stretching block, the first guide block and the second stretching block can be longitudinally stretched by upper and lower displacement between the first guide block and the second guide block, the third guide block is slidably embedded at the front end surfaces of the third stretching block and the fourth stretching block, the fourth guide block is slidably embedded at the rear end surfaces of the third stretching block and the fourth stretching block, the third stretching block and the fourth stretching block can be longitudinally embedded between the third stretching block and the fourth stretching block, the fourth stretching block can be longitudinally embedded at the front end surfaces of the third stretching block and the fourth stretching block, the fourth stretching block can be horizontally embedded between the first stretching block and the fourth stretching block, the fourth stretching block can be horizontally displaced between the first stretching block and the fourth stretching block.

2. A multi-segment stent device as defined in claim 1 wherein:

3. A multi-segment stent device as defined in claim 2 wherein: the two first inclined planes are respectively provided with two first inclined plane guide rails, the two second inclined planes are respectively provided with two second inclined plane guide rails, the two third inclined planes are respectively provided with two third inclined plane guide rails, the two fourth inclined planes are respectively provided with two fourth inclined plane guide rails, the first upper inclined plane is provided with a first upper dovetail groove for the first inclined plane guide rails of the front end to slide and insert therein, the first lower inclined plane is provided with a first lower dovetail groove for the second inclined plane guide rails of the front end to slide and insert therein, the first front inclined plane is provided with a first front dovetail groove, the second upper inclined plane is provided with a second upper dovetail groove for the first inclined plane guide rails of the rear end to slide and insert therein, the second lower inclined plane is provided with a second lower dovetail groove for the second inclined plane guide rails of the rear end to slide and insert therein, the third upper inclined plane is provided with a third upper dovetail groove for the sliding embedding of the third inclined plane guide rail at the front end, the third lower inclined plane is provided with a third lower dovetail groove for the sliding embedding of the fourth inclined plane guide rail at the front end, the third front inclined plane is provided with a third front dovetail groove, the fourth upper inclined plane is provided with a fourth upper dovetail groove for the sliding embedding of the third inclined plane guide rail at the rear end, the fourth lower inclined plane is provided with a fourth lower dovetail groove for the sliding embedding of the fourth inclined plane guide rail at the rear end, the fourth rear inclined plane is provided with a fourth rear dovetail groove, the two first pushing piece guide rails are respectively arranged on the two first pushing piece inclined planes for the sliding embedding of the first front dovetail groove and the third front dovetail groove, and the two second pushing piece guide rails are respectively arranged on the two second pushing piece inclined planes for the sliding embedding of the second dovetail groove and the fourth dovetail groove.

4. A multi-segment stent device as defined in claim 3 wherein: the lower end of the first front inclined surface is convexly provided with two first front stop blocks, the lower end of the second rear inclined surface is convexly provided with two second rear stop blocks, the rear lower end of the third front inclined surface is convexly provided with two third front stop blocks, the lower end of the fourth rear inclined surface is convexly provided with two fourth rear stop blocks, the upper side surface and the lower side surface of the first pushing piece are respectively provided with two first stop surfaces, the upper side surface and the lower side surface of the second pushing piece are respectively provided with two second stop surfaces, and the two first stop surfaces and the two second stop surfaces can be blocked by the two first front stop blocks, the two third front stop blocks, the two second rear stop blocks and the two fourth rear stop blocks respectively, so that the transverse stretching can not be continued any more, and the limit width of the first section stretching can be reached.

5. A multi-segment stent device as defined in claim 1 wherein: the rear side of the first pushing piece is convexly extended with a sleeve rod, and the screw hole is arranged in the sleeve rod.

6. The multi-segment stent device of claim 5, wherein: one end of the loop bar is combined with the first pushing piece in a threaded mode.

7. A multi-segment stent device as defined in claim 1 wherein: the bottom surface of the first stretching block is provided with a plurality of first guide blocks and a plurality of first guide grooves which are arranged in a staggered way and are trapezoidal, the top surface of the second stretching block is provided with a plurality of second guide grooves and a plurality of second guide blocks which can be correspondingly embedded with the plurality of first guide blocks and the plurality of first guide grooves in an up-and-down sliding way, the bottom surface of the third stretching block is provided with a plurality of third guide blocks and a plurality of third guide grooves which are arranged in a staggered way and are trapezoidal, and the top surface of the fourth stretching block is provided with a plurality of fourth guide grooves and a plurality of fourth guide blocks which can be correspondingly embedded with the plurality of third guide blocks and the plurality of third guide grooves in an up-and-down sliding way.

8. A multi-segment stent device as defined in claim 3 wherein: the first front dovetail groove, the second rear dovetail groove, the third front dovetail groove and the fourth rear dovetail groove are respectively provided with a limit guide groove, one end of each limit guide groove is open, the other end of each limit guide groove forms a limit stop surface, one ends of the two first pushing piece guide rails and the two second pushing piece guide rails are respectively provided with a convex part in a protruding mode, the four convex parts can slide in the four-pole limit guide grooves respectively, and the four convex parts can be blocked by the limit stop surfaces of the four-pole limit guide grooves respectively, so that the transverse stretching can not be continued any more, and the limit width of the first stretch is further reached.

9. A multi-segment stent device as defined in claim 4 or 8 wherein: the first upper dovetail groove, the first lower dovetail groove, the second upper dovetail groove, the second lower dovetail groove, the third upper dovetail groove, the third lower dovetail groove, the fourth upper dovetail groove and the fourth lower dovetail groove are respectively provided with a limiting guide groove, one end of each limiting guide groove is in an opening shape, the other end of each limiting guide groove forms a clamping surface, one clamping part is respectively arranged at one ends of each of the two first inclined guide rails, the two second inclined guide rails, the two third inclined guide rails and the two fourth guide rails in a protruding mode, eight clamping parts can slide in the eight limiting guide grooves respectively, and the clamping surfaces of the eight limiting guide grooves can block the eight clamping parts, so that the first, second, third and fourth stretching blocks can not be easily separated from the first, second, third and fourth guide blocks when the edge is stretched.

10. A multi-segment stent device as defined in claim 1 wherein: the device also comprises two guide structures which are respectively arranged between the first stretching block and the third stretching block and between the second stretching block and the fourth stretching block, and can assist the smooth synchronous displacement of the first stretching block, the third stretching block, the second stretching block and the fourth stretching block during stretching.

11. A multi-segment stent device as defined in claim 10 wherein: the two guide structures comprise a plurality of guide holes and two guide pieces, wherein the guide holes and the two guide pieces respectively transversely penetrate through the first stretching block, the second stretching block, the third stretching block and the fourth stretching block, the two guide pieces are respectively and correspondingly arranged between the first stretching block, the third stretching block and the second stretching block and the fourth stretching block, each guide piece comprises at least one guide rod, and two ends of each guide rod are respectively and telescopically inserted into the corresponding two guide holes.

12. A multi-segment stent device as defined in claim 10 wherein: the two guide structures comprise a plurality of guide holes and two guide pieces, wherein the guide holes and the two guide pieces respectively transversely penetrate through the first stretching block, the second stretching block, the third stretching block and the fourth stretching block, the two guide pieces are respectively and correspondingly arranged between the first stretching block, the third stretching block and the second stretching block, each guide piece comprises two parallel guide rods and a connecting rod connected with the centers of the two guide rods, and two ends of the two guide rods of the two guide pieces are respectively and telescopically inserted into the corresponding plurality of guide holes.

13. A multi-segment stent device as defined in claim 1 wherein: the first stretching block, the second stretching block, the third stretching block and the fourth stretching block respectively comprise a front block and a rear block, and the corresponding front block and the rear block are in sliding connection through corresponding inclined connection surfaces, so that a plurality of front blocks and a plurality of rear blocks can be matched with the unevenness of the opposite surfaces of the upper bone section and the lower bone section to sequentially form longitudinal two-section stretching.

14. A multi-segment stent device as defined in claim 13 wherein: the two corresponding inclined joint surfaces are respectively provided with a dovetail groove and a guide rail which are correspondingly and slidably embedded.