US20190159902A1 - Acetabular cup assembly - Google Patents
Acetabular cup assembly Download PDFInfo
- Publication number
- US20190159902A1 US20190159902A1 US15/825,430 US201715825430A US2019159902A1 US 20190159902 A1 US20190159902 A1 US 20190159902A1 US 201715825430 A US201715825430 A US 201715825430A US 2019159902 A1 US2019159902 A1 US 2019159902A1
- Authority
- US
- United States
- Prior art keywords
- shell
- liner
- wall
- tapered
- inwardly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 239000000463 material Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910010293 ceramic material Inorganic materials 0.000 claims 2
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 239000007943 implant Substances 0.000 description 6
- 210000000689 upper leg Anatomy 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 210000000588 acetabulum Anatomy 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 210000004197 pelvis Anatomy 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 210000004394 hip joint Anatomy 0.000 description 2
- 238000011540 hip replacement Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000399 orthopedic effect Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
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- 239000013589 supplement Substances 0.000 description 2
- 238000001356 surgical procedure Methods 0.000 description 2
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229920010741 Ultra High Molecular Weight Polyethylene (UHMWPE) Polymers 0.000 description 1
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical compound [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 239000000560 biocompatible material Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000010952 cobalt-chrome Substances 0.000 description 1
- 210000001624 hip Anatomy 0.000 description 1
- 230000008407 joint function Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 208000015122 neurodegenerative disease Diseases 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 210000002832 shoulder Anatomy 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools for implanting artificial joints
- A61F2/4603—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4609—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof of acetabular cups
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
- A61F2002/30349—Conically- or frustoconically-shaped protrusion and recess the male and female complementary cones being of different conicities, i.e. for reducing the contact area
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
- A61F2002/305—Snap connection
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
- A61F2002/30538—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting angular orientation
- A61F2002/3054—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting angular orientation about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
Definitions
- the invention relates to acetabular cups, specifically to acetabular cups having a shell and a liner.
- Hip joints are increasingly being used to treat degenerative diseases and other conditions that affect hip, knee, shoulder and other joint function.
- One prevalent use of orthopedic implants is for hip replacement surgeries.
- the hip joint is made up of the spherical head of the femur and the cup-shaped acetabulum of the pelvis.
- a stem is inserted into the femur.
- a ball replicates the spherical head of the femur.
- a cup is implanted into the pelvis to replicate the acetabulum.
- the cup is often made of a shell that is implanted into the pelvis and a liner that sits within the interior of the shell and provides a bearing surface for the ball.
- An acetabular cup assembly comprises a shell, the shell having an inner surface defining an interior space, an outer surface defining an outer surface, a face positioned at an upper end of the shell, and an apex positioned at a lower end of the inner surface.
- the inner surface comprises a tapered inner wall extending from the face toward the apex; a plurality of inwardly-facing recesses provided along the inner surface adjacent the face; a concave portion defined between the tapered inner wall and the apex; and a liner adapted to fit within the interior space and engage the inner surface of the shell establishing an interference fit.
- the plurality of inwardly-facing recesses have a main portion and an asymmetrically-extending portion and interrupt the tapered inner wall.
- the plurality of inwardly-facing recesses also define a segmented portion of the tapered inner wall between each pair of adjacent inwardly-facing recesses.
- Each of the asymmetrically-extending portion extends circumferentially in one direction and is spaced apart from the face resulting in the recesses having an asymmetric shape and the segmented portion of the tapered inner wall has a wide portion between the asymmetrically-extending portion and the face and a narrower portion between the asymmetrically-extending portion and the adjacent inwardly-facing recess.
- a method for implanting an acetabular cup comprises the steps of:
- a shell member having an inner surface defining an interior space and a central axis, an outer surface defining an outer hemispherical surface, a face positioned at an upper end of the shell, and an apex positioned at a lower end of the inner surface, the inner surface comprising a tapered inner wall extending axially, a concave portion defined between the tapered inner wall and the apex, and an annular groove provided between the tapered inner wall and the concave portion and extending at least partially around the inner surface; wherein the tapered inner wall has an inner diameter, at a predefined contact point that is 0.5 to 3.0 mm from the annular groove, that is same as the outside diameter of the annular rib of the liner;
- a liner for axial securement within the internal cavity and having a central liner axis, an outer surface that is configured with a male tapered surface that is compatible with the tapered inner wall, the liner having an annular rib provided at the bottom end of the male tapered surface for being received into the annular groove of the shell member, the central axis coinciding with the central liner axis when the shell member and the liner are assembled;
- FIG. 1 shows a perspective view of an acetabular shell component of the acetabular cup implant system
- FIG. 2 shows a perspective view of a liner component of the acetabular cup implant system
- FIG. 3 shows an exploded axial cross-sectional view of the acetabular cup implant system of the present disclosure
- FIG. 4 shows a detailed view of a portion of the acetabular shell component
- FIG. 5 shows a detailed view of the annular groove provided on the acetabular shell and the annular rib provided on the liner;
- FIG. 6 shows a cross-sectional view of the acetabular shell and the liner with the annular rib of the liner in contact with the tapered inner wall of the shell.
- the present disclosure describes an acetabular cup assembly that can be used in hip replacement surgeries.
- the acetabular cup includes a shell and a liner.
- the shell and the liner include features to ensure that the liner is secured to the shell and that relative movement therebetween is limited.
- the liner can be configured to serve as a bearing for a ball of a femur implant.
- the shell and liner can be provided in multiple sizes to allow the physician to choose the appropriate size based on the patient's anatomy.
- the shell can be compatible with multiple liners. For example, a single shell can be compatible with a ceramic liner, a polymeric liner, a metal liner, and liners of other suitable material.
- the acetabular cup assembly has a shell 100 and a liner 200 .
- the shell 100 has an inner surface 110 defining an interior space 116 .
- the shell 100 also includes an outer surface 122 , which can take the form of a convex surface and can define a hemispherical surface.
- the shell 100 also includes a face 125 positioned at an upper end of the shell 100 .
- the shell can be constructed of any appropriate material.
- the shell 100 can be constructed from titanium, cobalt chromium, stainless steel, or other biocompatible material.
- the outer surface of the shell 100 can be coated with a coating that improves bone ingrowth or improves the retention of the shell 100 in the acetabulum.
- the coating can be a porous coating.
- the coating can be a sintered metal coating, a vapor deposited metal coating, a thermal spray metal coating, or be chemically etched.
- the shell 100 and the liner 200 are symmetric about a central axis A of the assembly.
- the inner surface 110 of the shell 100 includes a tapered inner wall 112 portion extending from the face 125 toward the apex 127 .
- the tapered inner wall is tapered at a first taper angle with respect to the central axis A.
- the liner 200 is adapted to fit within the interior space of the shell 100 and engage the inner surface 110 of the shell 100 and establish an interference fit therebetween.
- the liner has an outer surface 210 with a male tapered surface 212 portion that is tapered at a second taper angle with respect to the central axis of the liner.
- the male tapered surface 212 is configured to engage the tapered inner wall 112 portion of the shell 100 .
- the taper angles of the shell and the liner are selected to promote secure engagement of the two components.
- the first taper angle and the second taper angle are approximately the same as the first taper angle.
- the second taper angle is greater than the first taper angle.
- the first and taper angles are approximately 18°.
- the corner or the edge 126 where the tapered inner wall 112 portion and the face 125 of the shell 100 meet is chamfered,
- the chamfered edge 126 can help guide the insertion of the liner 200 into the shell 100 .
- the inner surface 110 of the shell 100 also includes a plurality of inwardly-facing recesses 130 provided along the inner surface 110 adjacent the face 125 .
- the plurality of inwardly-facing recesses 130 have a main portion 132 and an asymmetrically-extending portion 135 .
- the inwardly-facing recesses are provided for securement of the shell 100 and the liner 200 and the main portion 132 of the inwardly-facing recesses 130 is configured to receive a radial projection 230 (described below) of the liner 200 .
- the inwardly-facing recesses 130 interrupt the tapered inner wall 112 and define a segmented portion 115 of the tapered inner wall 112 between each pair of adjacent inwardly-facing recesses 130 .
- the function of the inwardly-facing recesses 130 will be discussed in more detail below.
- Each of the asymmetrically-extending portions 135 extend circumferentially in one direction. As will be described in more detail below, the asymmetrically-extending portions 135 provide additional means for establishing securement between the shell 100 and the liner 200 by providing interference fitting between the shell and the liner that supplements the locking engagement provided by the annular groove 150 of the shell and the annular rib 250 of the liner described below.
- the asymmetric configuration of the recesses 130 allows provision of the additional interference fitting mechanism between the shell 100 and the liner 200 without sacrificing too much of the tapered inner wall 112 surface. This provides more engagement of the corresponding tapered surfaces between the shell 100 and a ceramic liner which engages the shell via the tapered surfaces only.
- the asymmetrically-extending portions 135 do not extend up to the chamfered edge 126 .
- a portion of the tapered inner wall 112 between the face 125 and each of the asymmetrically-extending portion 135 form a part of the segmented portion 115 which is a wide portion 113 .
- the segmented portion 115 of the tapered inner wall has the wide portion 113 between the asymmetrically-extending portion 135 and the face 125 and a narrower portion 114 between the asymmetrically-extending portion 135 and the adjacent inwardly-facing recess 130 .
- This configuration providing the wide portion 113 near the face 125 along the rim of the shell 100 ensures that a maximum amount of the tapered inner wall 112 surface along the circumference of the shell along the rim is maintained even with the presence of the asymmetrically-extending portions 135 of the recesses 130 .
- the asymmetrically-extending portion 135 is shallower than the main portion 132 .
- the shell 100 can include any number of inwardly-facing recesses 130 . In one embodiment, the shell 100 includes twelve inwardly-facing recesses 130 . In another embodiment, the shell 100 includes ten inwardly-facing recesses 130 . In another embodiment, the shell 100 includes eight inwardly-facing recesses 130 . In another embodiment, the shell 100 includes six inwardly-facing recesses 130 . However, any number of inwardly-facing recesses 130 can be included.
- the inwardly-facing recesses 130 extend from the face 125 down into the shell 100 toward the apex in a direction parallel with the central axis A such that each of the inwardly-facing recesses 130 has a contoured sidewall 137 that extends parallel with the central axis A. Because the tapered inner wall 112 is tapered with respect to the central axis A, the sidewalls 137 of the recesses 130 intersect with the tapered inner wall 112 to form a tapered edge 139 . When the liner 200 is inserted into the shell 100 and fully assembled, the tapered edge 139 engages the liner 200 to form an interference fit and maintain the liner 200 in place in the shell 100 . The tapered edge 139 can form an interference fit with the liner 200 or bite into the liner 200 to secure the liner 200 inside the shell.
- the inner surface 110 also includes a concave portion 117 .
- the concave portion 117 is defined between the tapered inner wall 112 portion and the apex 127 .
- the shell 100 includes an annular groove 150 provided between the tapered inner wall 112 and the concave portion 117 .
- the annular groove 150 extends circumferentially, at least partially, around the inner surface 110 . In some embodiments, the annular groove 150 extends around the entire circumference. In other embodiments, the annular groove 150 can be segmented such that separate portions of the annular groove 150 are disposed around the circumference.
- the annular groove 150 can include any appropriate geometry.
- the annular groove 150 includes a top surface 151 which is oriented substantially perpendicularly to the central axis A. As described below, this ensures that the liner 200 and the annular groove 150 engage in a locking manner and prevents unintended removal of the shell 100 from the liner.
- the annular groove 150 can also include a second surface 152 which is substantially parallel to the central axis. The bottom portion of the annular groove 150 is formed by the concave portion 117 .
- the liners can generally be constructed of any appropriate material such as ceramic, metal, or polymer.
- the liner 200 is constructed of a polymeric material such as polyethylene (PE), ultra-high molecular weight polyethylene (UHMWPE), vitamin-E-doped polyethylene, or any other appropriate polymer.
- PE polyethylene
- UHMWPE ultra-high molecular weight polyethylene
- vitamin-E-doped polyethylene or any other appropriate polymer.
- the liner 200 includes additional features to ensure secure engagement with the shell 100 .
- the liner 200 has at least one radial projection 230 provided about the outer periphery of the liner 200 .
- the radial projections 230 are configured for engaging the plurality of inwardly-facing recesses 130 of the shell 100 .
- Each of the radial projections has a main portion 232 and an asymmetrically-extending portion 235 for engaging the corresponding main portion 132 and the asymmetrically-extending portions 135 of the inwardly-facing recesses 130 .
- the engagement of the main portion 232 of the liner with the corresponding main portions 132 of the shell prevents axial rotation of the liner within the shell when the liner 200 is fit within the shell 100 .
- the asymmetrically-extending portions 235 of the liner 200 and the corresponding asymmetrically-extending portions 135 of the shell 100 engage each other to form an interference fit between the shell and the liner when the liner 200 is fitted within the shell 100 .
- This interference fit between the shell and the liner supplements the securement of the two components provided by the annular rib 250 of the liner and the annular groove 150 of the shell described below.
- the liner also has an annular rib 250 configured to be received into the annular groove 150 of the shell 100 .
- the annular rib 250 and the annular groove 150 engage each other to prevent axial disassembly of the shell 100 and the liner 200 .
- the annular rib 250 has an outside diameter which is equal to an inner diameter of the tapered inner wall 112 of the shell 100 at a predefined contact point X from the annular groove 150 .
- This predefined contact point is determined so that as the liner 200 is being inserted into the shell 100 for locking engagement between the annular rib 250 and the annular groove 150 , the annular rib contacts the tapered inner wall 112 before the annular rib actually reaches the annular groove. This helps to center the liner 200 in the shell 100 as the liner 200 is being inserted into the shell 100 .
- annular rib 250 With the annular rib 250 in contact with the tapered inner wall 112 , continued insertion of the liner 200 into the shell 100 will cause the annular rib 250 of the polymeric liner 200 to elastically deform as the annular rib 250 reaches the fully engaged position with the annular groove 150 .
- the physical engagement of the annular rib 250 with the tapered inner wall 112 works in combination with the funnel-like shape of the tapered inner wall 112 portion in guiding the liner into the locking engagement position in the shell 100 .
- the annular rib 250 engages the annular groove 150 to securely lock the liner 200 in place.
- the predefined contact point X from the annular groove 150 to the contact point between the annular rib 250 and the inner wall 112 can be between approximately 0.5 mm and approximately 3.0 mm. In another embodiment, the predefined contact point is between approximately 1.0 mm and approximately 2.0 mm. In another embodiment, the predefined contact point is between approximately 1.2 mm and approximately 1.6 mm. In a preferred embodiment, the predefined contact point X is 1.4 mm.
- the outside diameter of the annular rib 250 can be less than the diameter of the second surface 152 of the annular groove 150 .
- the first surface 151 of the annular groove 150 prevents the annular rib 250 from exiting the annular groove 150 and, thereby, prevents removal of the liner 200 from the shell 100 .
- the inwardly-facing recesses 130 of the shell 100 engage the radial projections 230 of the liner 200 simultaneously with the engagement of the annular rib 250 with the tapered inner wall 112 .
- the liner 200 is centered within the shell 100 and rotationally aligned due to engagement of the radial projections 230 with the inwardly-facing recesses 130 .
- a method for implanting an acetabular cup includes the step of providing a shell having an inner surface defining an interior space and a central axis and an outer surface defining an outer hemispherical surface.
- the shell also includes a face positioned at an upper end of the shell and an apex positioned at a lower end of the inner surface.
- the inner surface includes a tapered inner wall extending axially and a concave portion defined between the tapered inner wall and the apex.
- the shell also includes an annular groove positioned between the tapered inner wall and the concave portion.
- the tapered inner wall extends at least partially around the inner surface.
- the method further includes providing a liner for axial securement within the internal cavity of the shell.
- the liner has an outer surface that is tapered with respect to a central liner axis. The outer surface is compatible with the tapered inner wall of the shell.
- the liner also has an annular rib at the bottom of the male tapered surface and is configured to be received within the annular groove of the shell. When assembled, the central liner axis coincides with the central axis.
- the method includes centering the liner in the shell by axially inserting the liner into the interior space of the shell until the annular rib of the liner engages the tapered inner wall of the shell.
- the tapered inner wall has a diameter that is equal to the outside diameter of the annular rib.
- the method further includes securing the liner within the shell by further inserting the liner in the axial direction until the annular rib snaps into the annular groove of the shell.
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physical Education & Sports Medicine (AREA)
- Prostheses (AREA)
Abstract
Description
- The invention relates to acetabular cups, specifically to acetabular cups having a shell and a liner.
- Orthopedic implants are increasingly being used to treat degenerative diseases and other conditions that affect hip, knee, shoulder and other joint function. One prevalent use of orthopedic implants is for hip replacement surgeries. The hip joint is made up of the spherical head of the femur and the cup-shaped acetabulum of the pelvis. For replacement of the hip joint, a stem is inserted into the femur. On the proximal end of the stem, a ball replicates the spherical head of the femur. A cup is implanted into the pelvis to replicate the acetabulum. The cup is often made of a shell that is implanted into the pelvis and a liner that sits within the interior of the shell and provides a bearing surface for the ball.
- An acetabular cup assembly according to the present disclosure comprises a shell, the shell having an inner surface defining an interior space, an outer surface defining an outer surface, a face positioned at an upper end of the shell, and an apex positioned at a lower end of the inner surface. The inner surface comprises a tapered inner wall extending from the face toward the apex; a plurality of inwardly-facing recesses provided along the inner surface adjacent the face; a concave portion defined between the tapered inner wall and the apex; and a liner adapted to fit within the interior space and engage the inner surface of the shell establishing an interference fit. The plurality of inwardly-facing recesses have a main portion and an asymmetrically-extending portion and interrupt the tapered inner wall. The plurality of inwardly-facing recesses also define a segmented portion of the tapered inner wall between each pair of adjacent inwardly-facing recesses. Each of the asymmetrically-extending portion extends circumferentially in one direction and is spaced apart from the face resulting in the recesses having an asymmetric shape and the segmented portion of the tapered inner wall has a wide portion between the asymmetrically-extending portion and the face and a narrower portion between the asymmetrically-extending portion and the adjacent inwardly-facing recess.
- A method for implanting an acetabular cup is also disclosed. The method comprises the steps of:
- providing a shell member having an inner surface defining an interior space and a central axis, an outer surface defining an outer hemispherical surface, a face positioned at an upper end of the shell, and an apex positioned at a lower end of the inner surface, the inner surface comprising a tapered inner wall extending axially, a concave portion defined between the tapered inner wall and the apex, and an annular groove provided between the tapered inner wall and the concave portion and extending at least partially around the inner surface; wherein the tapered inner wall has an inner diameter, at a predefined contact point that is 0.5 to 3.0 mm from the annular groove, that is same as the outside diameter of the annular rib of the liner;
- providing a liner for axial securement within the internal cavity and having a central liner axis, an outer surface that is configured with a male tapered surface that is compatible with the tapered inner wall, the liner having an annular rib provided at the bottom end of the male tapered surface for being received into the annular groove of the shell member, the central axis coinciding with the central liner axis when the shell member and the liner are assembled;
- centering the liner in the shell member by inserting the liner in axial direction into the interior space of the shell member until the annular rib of the liner engages the tapered inner wall of the shell before the annular rib snaps into the annular groove of the shell member; and
- securing the liner within the shell member by further inserting the liner in axial direction into the interior space of the shell member until the annular rib snaps into the annular groove of the shell member.
- These and other features and advantages of the present invention will be more fully disclosed in, or rendered obvious by, the following detailed description of the preferred embodiment of the invention, which is to be considered together with the accompanying drawings wherein like numbers refer to like parts and further wherein:
-
FIG. 1 shows a perspective view of an acetabular shell component of the acetabular cup implant system; -
FIG. 2 shows a perspective view of a liner component of the acetabular cup implant system; -
FIG. 3 shows an exploded axial cross-sectional view of the acetabular cup implant system of the present disclosure; -
FIG. 4 shows a detailed view of a portion of the acetabular shell component; -
FIG. 5 shows a detailed view of the annular groove provided on the acetabular shell and the annular rib provided on the liner; -
FIG. 6 shows a cross-sectional view of the acetabular shell and the liner with the annular rib of the liner in contact with the tapered inner wall of the shell. - This description of preferred embodiments is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description of this invention. The drawing figures are not necessarily to scale and certain features of the invention may be shown exaggerated in scale or in somewhat schematic form in the interest of clarity and conciseness. In the description, relative terms such as “horizontal,” “vertical,” “up,” “down,” “top,” and “bottom” as well as derivatives thereof (e.g., “horizontally,” “downwardly,” “upwardly,” etc.) should be construed to refer to the orientation as then described or as shown in the drawing figure under discussion. These relative terms are for convenience of description and normally are not intended to require a particular orientation. Terms including “inwardly” versus “outwardly,” “longitudinal” versus “lateral” and the like are to be interpreted relative to one another or relative to an axis of elongation, or an axis or center of rotation, as appropriate. Terms concerning attachments, coupling and the like, such as “connected” and “interconnected,” refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise. The term “operatively or operably connected” is such an attachment, coupling or connection that allows the pertinent structures to operate as intended by virtue of that relationship. In the claims, means-plus-function clauses, if used, are intended to cover the structures described, suggested, or rendered obvious by the written description or drawings for performing the recited function, including not only structural equivalents but also equivalent structures.
- The present disclosure describes an acetabular cup assembly that can be used in hip replacement surgeries. As described further with reference to the embodiments herein, the acetabular cup includes a shell and a liner. The shell and the liner include features to ensure that the liner is secured to the shell and that relative movement therebetween is limited. The liner can be configured to serve as a bearing for a ball of a femur implant. The shell and liner can be provided in multiple sizes to allow the physician to choose the appropriate size based on the patient's anatomy. The shell can be compatible with multiple liners. For example, a single shell can be compatible with a ceramic liner, a polymeric liner, a metal liner, and liners of other suitable material.
- In one embodiment, as shown in
FIG. 1 , the acetabular cup assembly has ashell 100 and aliner 200. Theshell 100 has aninner surface 110 defining aninterior space 116. Theshell 100 also includes anouter surface 122, which can take the form of a convex surface and can define a hemispherical surface. Theshell 100 also includes aface 125 positioned at an upper end of theshell 100. - The shell can be constructed of any appropriate material. For example, the
shell 100 can be constructed from titanium, cobalt chromium, stainless steel, or other biocompatible material. Additionally, the outer surface of theshell 100 can be coated with a coating that improves bone ingrowth or improves the retention of theshell 100 in the acetabulum. For example, the coating can be a porous coating. The coating can be a sintered metal coating, a vapor deposited metal coating, a thermal spray metal coating, or be chemically etched. - As shown in
FIG. 3 , theshell 100 and theliner 200 are symmetric about a central axis A of the assembly. Theinner surface 110 of theshell 100 includes a taperedinner wall 112 portion extending from theface 125 toward theapex 127. The tapered inner wall is tapered at a first taper angle with respect to the central axis A. - The
liner 200 is adapted to fit within the interior space of theshell 100 and engage theinner surface 110 of theshell 100 and establish an interference fit therebetween. The liner has anouter surface 210 with a maletapered surface 212 portion that is tapered at a second taper angle with respect to the central axis of the liner. The maletapered surface 212 is configured to engage the taperedinner wall 112 portion of theshell 100. The taper angles of the shell and the liner are selected to promote secure engagement of the two components. In one embodiment, the first taper angle and the second taper angle are approximately the same as the first taper angle. In another embodiment, the second taper angle is greater than the first taper angle. In one embodiment, the first and taper angles are approximately 18°. - The corner or the
edge 126 where the taperedinner wall 112 portion and theface 125 of theshell 100 meet is chamfered, The chamferededge 126 can help guide the insertion of theliner 200 into theshell 100. - Referring to
FIG. 4 , theinner surface 110 of theshell 100 also includes a plurality of inwardly-facingrecesses 130 provided along theinner surface 110 adjacent theface 125. The plurality of inwardly-facingrecesses 130 have amain portion 132 and an asymmetrically-extendingportion 135. The inwardly-facing recesses are provided for securement of theshell 100 and theliner 200 and themain portion 132 of the inwardly-facingrecesses 130 is configured to receive a radial projection 230 (described below) of theliner 200. - The inwardly-facing
recesses 130 interrupt the taperedinner wall 112 and define asegmented portion 115 of the taperedinner wall 112 between each pair of adjacent inwardly-facingrecesses 130. The function of the inwardly-facingrecesses 130 will be discussed in more detail below. - Each of the asymmetrically-extending
portions 135 extend circumferentially in one direction. As will be described in more detail below, the asymmetrically-extendingportions 135 provide additional means for establishing securement between theshell 100 and theliner 200 by providing interference fitting between the shell and the liner that supplements the locking engagement provided by theannular groove 150 of the shell and theannular rib 250 of the liner described below. - The asymmetric configuration of the
recesses 130 allows provision of the additional interference fitting mechanism between theshell 100 and theliner 200 without sacrificing too much of the taperedinner wall 112 surface. This provides more engagement of the corresponding tapered surfaces between theshell 100 and a ceramic liner which engages the shell via the tapered surfaces only. - In addition, the asymmetrically-extending
portions 135 do not extend up to the chamferededge 126. Hence, a portion of the taperedinner wall 112 between theface 125 and each of the asymmetrically-extendingportion 135 form a part of thesegmented portion 115 which is awide portion 113. As a result, thesegmented portion 115 of the tapered inner wall has thewide portion 113 between the asymmetrically-extendingportion 135 and theface 125 and anarrower portion 114 between the asymmetrically-extendingportion 135 and the adjacent inwardly-facingrecess 130. This configuration providing thewide portion 113 near theface 125 along the rim of theshell 100 ensures that a maximum amount of the taperedinner wall 112 surface along the circumference of the shell along the rim is maintained even with the presence of the asymmetrically-extendingportions 135 of therecesses 130. In at least one embodiment, the asymmetrically-extendingportion 135 is shallower than themain portion 132. - The
shell 100 can include any number of inwardly-facingrecesses 130. In one embodiment, theshell 100 includes twelve inwardly-facingrecesses 130. In another embodiment, theshell 100 includes ten inwardly-facingrecesses 130. In another embodiment, theshell 100 includes eight inwardly-facingrecesses 130. In another embodiment, theshell 100 includes six inwardly-facingrecesses 130. However, any number of inwardly-facingrecesses 130 can be included. - In one embodiment, the inwardly-facing
recesses 130 extend from theface 125 down into theshell 100 toward the apex in a direction parallel with the central axis A such that each of the inwardly-facingrecesses 130 has a contouredsidewall 137 that extends parallel with the central axis A. Because the taperedinner wall 112 is tapered with respect to the central axis A, thesidewalls 137 of therecesses 130 intersect with the taperedinner wall 112 to form atapered edge 139. When theliner 200 is inserted into theshell 100 and fully assembled, thetapered edge 139 engages theliner 200 to form an interference fit and maintain theliner 200 in place in theshell 100. Thetapered edge 139 can form an interference fit with theliner 200 or bite into theliner 200 to secure theliner 200 inside the shell. - Referring to
FIG. 3 , theinner surface 110 also includes aconcave portion 117. Theconcave portion 117 is defined between the taperedinner wall 112 portion and the apex 127. Theshell 100 includes anannular groove 150 provided between the taperedinner wall 112 and theconcave portion 117. Theannular groove 150 extends circumferentially, at least partially, around theinner surface 110. In some embodiments, theannular groove 150 extends around the entire circumference. In other embodiments, theannular groove 150 can be segmented such that separate portions of theannular groove 150 are disposed around the circumference. - The
annular groove 150 can include any appropriate geometry. In one embodiment, as shown inFIG. 5 , theannular groove 150 includes atop surface 151 which is oriented substantially perpendicularly to the central axis A. As described below, this ensures that theliner 200 and theannular groove 150 engage in a locking manner and prevents unintended removal of theshell 100 from the liner. Theannular groove 150 can also include asecond surface 152 which is substantially parallel to the central axis. The bottom portion of theannular groove 150 is formed by theconcave portion 117. - The liners can generally be constructed of any appropriate material such as ceramic, metal, or polymer. In the embodiments disclosed herein the
liner 200 is constructed of a polymeric material such as polyethylene (PE), ultra-high molecular weight polyethylene (UHMWPE), vitamin-E-doped polyethylene, or any other appropriate polymer. - The
liner 200 includes additional features to ensure secure engagement with theshell 100. Theliner 200 has at least oneradial projection 230 provided about the outer periphery of theliner 200. Theradial projections 230 are configured for engaging the plurality of inwardly-facingrecesses 130 of theshell 100. Each of the radial projections has amain portion 232 and an asymmetrically-extendingportion 235 for engaging the correspondingmain portion 132 and the asymmetrically-extendingportions 135 of the inwardly-facingrecesses 130. The engagement of themain portion 232 of the liner with the correspondingmain portions 132 of the shell prevents axial rotation of the liner within the shell when theliner 200 is fit within theshell 100. The asymmetrically-extendingportions 235 of theliner 200 and the corresponding asymmetrically-extendingportions 135 of theshell 100 engage each other to form an interference fit between the shell and the liner when theliner 200 is fitted within theshell 100. This interference fit between the shell and the liner supplements the securement of the two components provided by theannular rib 250 of the liner and theannular groove 150 of the shell described below. - The liner also has an
annular rib 250 configured to be received into theannular groove 150 of theshell 100. Theannular rib 250 and theannular groove 150 engage each other to prevent axial disassembly of theshell 100 and theliner 200. - Referring to
FIG. 6 , theannular rib 250 has an outside diameter which is equal to an inner diameter of the taperedinner wall 112 of theshell 100 at a predefined contact point X from theannular groove 150. This predefined contact point is determined so that as theliner 200 is being inserted into theshell 100 for locking engagement between theannular rib 250 and theannular groove 150, the annular rib contacts the taperedinner wall 112 before the annular rib actually reaches the annular groove. This helps to center theliner 200 in theshell 100 as theliner 200 is being inserted into theshell 100. With theannular rib 250 in contact with the taperedinner wall 112, continued insertion of theliner 200 into theshell 100 will cause theannular rib 250 of thepolymeric liner 200 to elastically deform as theannular rib 250 reaches the fully engaged position with theannular groove 150. The physical engagement of theannular rib 250 with the taperedinner wall 112 works in combination with the funnel-like shape of the taperedinner wall 112 portion in guiding the liner into the locking engagement position in theshell 100. Upon being fully inserted, theannular rib 250 engages theannular groove 150 to securely lock theliner 200 in place. In one embodiment, the predefined contact point X from theannular groove 150 to the contact point between theannular rib 250 and theinner wall 112 can be between approximately 0.5 mm and approximately 3.0 mm. In another embodiment, the predefined contact point is between approximately 1.0 mm and approximately 2.0 mm. In another embodiment, the predefined contact point is between approximately 1.2 mm and approximately 1.6 mm. In a preferred embodiment, the predefined contact point X is 1.4 mm. - The outside diameter of the
annular rib 250 can be less than the diameter of thesecond surface 152 of theannular groove 150. As a result, with theliner 200 fully inserted in theshell 100, theannular rib 250 can fit within theannular groove 150 in a natural or uncompressed condition. Thefirst surface 151 of theannular groove 150 prevents theannular rib 250 from exiting theannular groove 150 and, thereby, prevents removal of theliner 200 from theshell 100. - In some embodiments, the inwardly-facing
recesses 130 of theshell 100 engage theradial projections 230 of theliner 200 simultaneously with the engagement of theannular rib 250 with the taperedinner wall 112. At this point, theliner 200 is centered within theshell 100 and rotationally aligned due to engagement of theradial projections 230 with the inwardly-facingrecesses 130. - In another embodiment, a method for implanting an acetabular cup, according to the embodiments described above, is provided. The method includes the step of providing a shell having an inner surface defining an interior space and a central axis and an outer surface defining an outer hemispherical surface. The shell also includes a face positioned at an upper end of the shell and an apex positioned at a lower end of the inner surface. The inner surface includes a tapered inner wall extending axially and a concave portion defined between the tapered inner wall and the apex. The shell also includes an annular groove positioned between the tapered inner wall and the concave portion. The tapered inner wall extends at least partially around the inner surface.
- The method further includes providing a liner for axial securement within the internal cavity of the shell. The liner has an outer surface that is tapered with respect to a central liner axis. The outer surface is compatible with the tapered inner wall of the shell. The liner also has an annular rib at the bottom of the male tapered surface and is configured to be received within the annular groove of the shell. When assembled, the central liner axis coincides with the central axis.
- The method includes centering the liner in the shell by axially inserting the liner into the interior space of the shell until the annular rib of the liner engages the tapered inner wall of the shell. At a predefined distance from the annular groove, the tapered inner wall has a diameter that is equal to the outside diameter of the annular rib. As a result, the annular rib contacts the tapered inner wall prior to engaging the annular groove.
- The method further includes securing the liner within the shell by further inserting the liner in the axial direction until the annular rib snaps into the annular groove of the shell.
- While the foregoing description and drawings represent preferred or exemplary embodiments of the present invention, it will be understood that various additions, modifications and substitutions may be made therein without departing from the spirit and scope and range of equivalents of the accompanying claims. In particular, it will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, sizes, and with other elements, materials, and components, without departing from the spirit or essential characteristics thereof. In addition, numerous variations in the methods/processes described herein may be made without departing from the spirit of the invention. One skilled in the art will further appreciate that the invention may be used with many modifications of structure, arrangement, proportions, sizes, materials, and components and otherwise, used in the practice of the invention, which are particularly adapted to specific environments and operative requirements without departing from the principles of the present invention. The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being defined by the appended claims and equivalents thereof, and not limited to the foregoing description or embodiments. Rather, the appended claims should be construed broadly, to include other variants and embodiments of the invention, which may be made by those skilled in the art without departing from the scope and range of equivalents of the invention. All patents and published patent applications identified herein are incorporated herein by reference in their entireties.
Claims (21)
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- 2018-03-06 WO PCT/US2018/021024 patent/WO2019108242A1/en active Application Filing
Cited By (4)
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WO2021158661A1 (en) * | 2020-02-04 | 2021-08-12 | Encore Medical, Lp Dba Djo Surgical | Acetabular cup system |
JP2023513481A (en) * | 2020-02-04 | 2023-03-31 | アンコール メディカル,エルピー ディビーエー ディージェーオー サージカル | acetabular cup system |
US11857422B2 (en) | 2020-02-04 | 2024-01-02 | Encore Medical, Lp | Acetabular cup system |
JP7459266B2 (en) | 2020-02-04 | 2024-04-01 | アンコール メディカル,エルピー ディビーエー ディージェーオー サージカル | Acetabular Cup System |
Also Published As
Publication number | Publication date |
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US10307255B1 (en) | 2019-06-04 |
WO2019108242A1 (en) | 2019-06-06 |
CN111356418A (en) | 2020-06-30 |
CN111356418B (en) | 2021-04-20 |
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