CN212466265U - Local automatic continuous administration supporting rod for femoral head necrosis - Google Patents
Local automatic continuous administration supporting rod for femoral head necrosis Download PDFInfo
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- CN212466265U CN212466265U CN202020661216.3U CN202020661216U CN212466265U CN 212466265 U CN212466265 U CN 212466265U CN 202020661216 U CN202020661216 U CN 202020661216U CN 212466265 U CN212466265 U CN 212466265U
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Abstract
The utility model provides a local automatic support stick that continuously doses of femoral head necrosis, including the barred body, the barred body includes globular stick head and screw thread stick tail, be the cavity in the barred body, first half of institute's cavity is equipped with the medicine carrying chamber, is equipped with the screw hole on the globular stick head, threaded hole is equipped with the head end nut, globular stick head is equipped with a plurality of medicine outlets all around, be equipped with the shutoff material on the medicine outlet, barred body tail end inboard is equipped with nail tail shutoff bolt, is equipped with compression spring fixation nut on the nail tail shutoff bolt, barred body inner chamber rear end is equipped with the piston that pushes away the powder, be equipped with compression spring on the piston that pushes away the powder. The utility model discloses can make the dead femoral head of necrosis when obtaining support bar mechanical support, last at the regional release of femoral head necrosis and restrain the osteolysis medicine, slow down the absorption of the regional necrotic sclerotin of femoral head necrosis, provide sufficient time for the femoral head is restoreed, finally cure femoral head necrosis.
Description
Technical Field
The utility model belongs to the technical field of medical equipment, specifically speaking relates to a local automatic support stick that continuously doses of femoral head necrosis.
Background
Femoral head necrosis is a common disease in clinic, if the femoral head necrosis is not treated, more than 85% of femoral head articular surfaces collapse, pain and disability of patients are caused, joint replacement is finally needed, although the service life of artificial joints is greatly prolonged along with the progress of joint replacement technology, the femoral head necrosis is mostly a young and strong patient, the activity is large, and the long-term failure rate of joint replacement is high. Therefore, the efforts of orthopedists to take measures to protect the femoral head before the femoral head is damaged are the direction of the femoral head necrosis. At present, the treatment of the early femoral head necrosis is mostly carried out by drilling, decompressing, bone grafting and a mode that a supporting rod (a tantalum rod, an autologous or allogenic supporting bone) supports a load bearing area, and a femoral head supporting implant for supporting collapse or necrosis needs to be refilled after dead bones are removed in the operation process. However, because the femoral head necrosis areas and ranges are various, the currently adopted femoral head support rod can only partially support the femoral head, and the bone of the unsupported femoral head necrosis part is still continuously damaged, so that the bone damage speed of part of femoral head necrosis patients is still higher than the repair speed although the femoral head support operation is performed, the femoral head strength is still gradually reduced, finally the femoral head is collapsed, and hip joint replacement is needed. However, the bone absorption inhibitor applied to the whole body cannot reach the lesion area due to poor blood circulation after femoral head ischemia. The disposable internal local medicine for the femoral head can not effectively inhibit the bone destruction of the femoral head due to the short action time of the medicine. In a word, the success rate of the operation of the femoral head support rod with the traditional structure is low.
SUMMERY OF THE UTILITY MODEL
The utility model provides a local automatic support stick that continuously doses of femoral head necrosis for solving above-mentioned problem.
The technical scheme of the utility model is realized like this: a local automatic continuous drug delivery support rod for femoral head necrosis comprises a rod body, wherein the rod body comprises a spherical rod head and a threaded rod tail, a hollow cavity is formed in the rod body, a drug loading cavity is formed in the first half part of the cavity, a threaded hole is formed in the spherical rod head, a head end nut is arranged in the threaded hole, a plurality of drug outlets are formed in the periphery of the spherical rod head, a blocking material is arranged on the drug outlets, a nail tail blocking bolt is arranged on the inner side of the tail end of the rod body, a compression spring fixing nut is arranged on the nail tail blocking bolt, a drug pushing piston is arranged at the rear end of the inner cavity of the rod body, a compression spring is arranged on the drug pushing piston, one end of the compression spring is fixedly connected with the nail tail blocking bolt, the other end of the compression spring is fixedly connected with;
the medicine pushing piston is T-shaped and is matched with the inner cavity of the rod body, and the tail end of the handle part of the medicine pushing piston is provided with threads and is in threaded connection with a compression spring fixing nut;
the outer side of the nail tail plugging bolt is provided with threads which are matched with the internal threads at the tail part of the rod body;
the head end screw cap and the plugging material are both PLGA absorbable materials;
the outer side surface of the rod body is sprayed with strontium-doped hydroxyapatite.
The utility model has the advantages that: the utility model relates to a simple structure, easy and simple to handle medical femoral head support rod can make the dead femoral head of femur when obtaining support rod mechanical support, last at the regional release of femoral head necrosis and restrain the bone destruction medicine, slows down the absorption of the regional necrotic sclerotin of femoral head necrosis, provides sufficient time for the femoral head is restoreed, finally cures the femoral head necrosis.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic cross-sectional view of fig. 1 according to the present invention;
FIG. 3 is a schematic view of the tail structure of the present invention;
fig. 4 is an application schematic diagram of the present invention, and the black circle in the femoral head represents the femoral head weight bearing area, which is the most easily collapsed part of the femoral head necrosis, and is also the expected range of the diffusion of the anti-bone resorption drug of the present invention.
Description of the parts: 1. tail end screw thread, 2, a rod body, 3, a head end screw cap, 4, a medicine outlet, 5, a compression spring fixing nut, 6, a nail tail plugging bolt, 7, a compression spring, 8, a medicine carrying cavity, 9, a medicine pushing piston, 10, a plugging material, 11, a rod head, 12, a rod tail, 13 and a threaded hole.
Detailed Description
For a better understanding and appreciation of the invention, it will be further described in connection with the accompanying drawings: a supporting rod for automatically and continuously feeding medicine to the local part of femoral head necrosis is similar to the traditional femoral head supporting rod in appearance and comprises a rod body 2, a spherical rod head 11 and a rod tail 12 with thick threads. The rod head 11 is hemispherical, the head end is provided with a threaded hole 13 for adding a bone absorption inhibitor (zoledronic acid injection) into the medicine carrying cavity, and the absorbable head end screw cap 3 made of PLGA can be used for sealing after the medicine is added, so that the liquid medicine is prevented from flowing out in the operation process. The side of the head of the rod body is provided with a plurality of groove-shaped medicine outlets 4, and the medicine outlets 4 before the support rod is implanted into the body are plugged by PLGA materials which can be absorbed in the body so as to prevent the medicine liquid from flowing out in the operation process. The lateral surface of the rod tail is provided with a coarse thread, so that the support rod can be screwed into the femoral head, the firmness of the support rod is improved, the support rod is prevented from falling off, the strontium-doped hydroxyapatite is sprayed on the lateral surface of the support rod, the fusion of the long-term support rod and the femoral head is facilitated, and the strontium element can promote the osteogenesis in the femoral head.
The support rod body 2 is hollow, the inner wall is highly polished, friction-free movement of the medicine pushing piston 9 is facilitated, the medicine pushing piston is in a T shape, the body part is matched with the inner cavity of the support rod, the tail end of the handle part is provided with threads and can be connected with the compression spring fixing nut 5, the compression spring 7 is in the maximum compression state, the screw threads are arranged outside the nail tail plugging bolt 6 and can be matched with the internal threads at the tail part of the inner wall of the support rod, the nail tail plugging bolt 6 serves as an acting point for the compression spring 7 to push the medicine pushing piston 9 forwards after being fixed, the center of the nail tail plugging bolt 6 is provided with a hole, the body part of the compression spring fixing nut 5 passes through and is connected with the medicine pushing piston 9 through the threads, the compression spring is located between the medicine pushing piston and the nail tail plugging bolt, one end of the compression spring 7 is fixedly connected with the nail tail plugging bolt 6.
Specifically, the guide pin is driven into the femoral head support rod under perspective, so that the position of the guide pin is located at the center of the femoral head support rod, and the head end of the guide pin is located at the center of the femoral head weight bearing area. Drilling a hole by using a trepan with the diameter smaller than that of the support rod by 1mm, taking out the bone column, unscrewing a head end screw cap 3 made of PLGA material at the head end of the femoral head support rod, filling zoledronic acid injection in a drug-carrying cavity 8 of the femoral head support rod, and screwing the PLGA head end screw cap 3 into a threaded hole 13. The femoral head support rod is driven into the femoral head, and the tail end thread part needs to be screwed in. The position of the femoral head supporting rod is proved to be good through perspective. The compression spring fixing nut 5 is unscrewed, the medicine pushing piston 9 is released, the medicine pushing piston 9 is pushed forwards under the action of the compression spring 7, the pressure of liquid medicine in the medicine carrying cavity 8 is increased, and after the PLGA plugging material 10 at the medicine outlet 4 is quickly absorbed, the zoledronic acid injection in the medicine carrying cavity 8 is gradually diffused to the periphery of a femoral head load bearing area under the action of pressure. Because the tissue in the femoral head has certain resistance, the liquid medicine can not be completely released in a short time, but gradually diffuses towards the periphery of the medicine outlet. The high-concentration zoledronic acid in the femoral head can powerfully inhibit osteoclast and inhibit rapid damage of bone in necrotic femoral head, thereby reducing the risk of collapse of femoral head after femoral head necrosis, striving for time for repairing necrotic bone and maximally improving the success rate of head-protecting treatment of femoral head necrosis.
Claims (5)
1. The utility model provides a local automatic support bar that continuously doses of femoral head necrosis, includes barred body (2), barred body (2) including globular stick head (11) and screw thread stick tail (12), its characterized in that be the cavity in barred body (2), cavity first half is equipped with medicine carrying cavity (8), is equipped with screw hole (13) on globular stick head (11), be equipped with head end nut (3) in screw hole (13), globular stick head (11) are equipped with a plurality of medicine outlets (4) all around, be equipped with shutoff material (10) on medicine outlet (4), barred body (2) tail end inboard is equipped with nail tail shutoff bolt (6), is equipped with compression spring fixation nut (5) on nail tail shutoff bolt (6), barred body (2) inner chamber rear end is equipped with pushes away medicine piston (9), be equipped with compression spring (7) on pushing away medicine piston (9), compression spring (7) one end and nail tail shutoff bolt (6) fixed connection, the other end is fixedly connected with a pushing head of a medicine pushing piston (9), and the medicine pushing piston (9) is connected with a compression spring fixing nut (5).
2. The support rod for automatically and continuously feeding the local femoral head necrosis according to claim 1, wherein the medicine pushing piston (9) is T-shaped and is matched with the inner cavity of the rod body (2), and the tail end of the handle part of the medicine pushing piston (9) is provided with threads and is in threaded connection with the compression spring fixing nut (5).
3. The local automatic continuous administration supporting rod for femoral head necrosis according to claim 1 or 2, characterized in that the nail tail blocking bolt (6) is provided with threads on the outer side and matched with the internal threads on the tail part of the rod body (2).
4. The support rod for local automatic and continuous administration of femoral head necrosis according to claim 1 or 2, wherein the head end nut (3) and the blocking material (10) are both PLGA absorbable materials.
5. The support bar for automatic and continuous local administration of femoral head necrosis according to claim 1 or 2, wherein the outer side surface of the bar body (2) is coated with strontium-doped hydroxyapatite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020661216.3U CN212466265U (en) | 2020-04-27 | 2020-04-27 | Local automatic continuous administration supporting rod for femoral head necrosis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020661216.3U CN212466265U (en) | 2020-04-27 | 2020-04-27 | Local automatic continuous administration supporting rod for femoral head necrosis |
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| Publication Number | Publication Date |
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| CN212466265U true CN212466265U (en) | 2021-02-05 |
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| CN202020661216.3U Active CN212466265U (en) | 2020-04-27 | 2020-04-27 | Local automatic continuous administration supporting rod for femoral head necrosis |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111329624A (en) * | 2020-04-27 | 2020-06-26 | 滨州医学院烟台附属医院 | Local automatic continuous administration supporting rod for femoral head necrosis |
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2020
- 2020-04-27 CN CN202020661216.3U patent/CN212466265U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111329624A (en) * | 2020-04-27 | 2020-06-26 | 滨州医学院烟台附属医院 | Local automatic continuous administration supporting rod for femoral head necrosis |
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