WO2002007652A1 - Bimetal acetabular component construct for hip joint prosthesis - Google Patents
Bimetal acetabular component construct for hip joint prosthesis Download PDFInfo
- Publication number
- WO2002007652A1 WO2002007652A1 PCT/US2001/023126 US0123126W WO0207652A1 WO 2002007652 A1 WO2002007652 A1 WO 2002007652A1 US 0123126 W US0123126 W US 0123126W WO 0207652 A1 WO0207652 A1 WO 0207652A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metal
- construct
- acetabular component
- prosthetic
- component according
- Prior art date
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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
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- 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
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- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
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- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/02—Inorganic materials
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- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
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- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/28—Materials for coating prostheses
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- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
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- 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
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- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
- A61F2002/30016—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in hardness, e.g. Vickers, Shore, Brinell
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- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
- A61F2002/30028—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in tissue ingrowth capacity, e.g. made from both ingrowth-promoting and ingrowth-preventing parts
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Definitions
- This invention relates to surgical apparatus and procedures in general, and more particularly to orthopedic prostheses for restoring the hip joint.
- Joint replacement surgery seeks to replace portions of a joint with prosthetic components so as to provide long-lasting function and pain-free mobility.
- the head of the femur is replaced with a prosthetic femoral stem component
- the socket of the acetabulum is replaced by a prosthetic acetabular cup component, whereby to provide a prosthetic total hip joint.
- a prosthetic total knee joint In the case of a prosthetic total knee joint, the top of the tibia is replaced by a prosthetic tibial component, and the bottom of the femur is replaced by a prosthetic femoral component, whereby to provide a prosthetic total knee joint.
- the present invention is directed to orthopedic prostheses for restoring the hip joint and, in particular, to improved prosthetic acetabular components.
- joint replacement prostheses There is a long and varied history in the use of different materials for joint replacement prostheses. Some early attempts, such as stainless steel hip prostheses, were found to be reasonably successful and are still in use today. Other attempts, such as acrylic femoral head replacements or Teflon ⁇ TMJ" replacements, were found to be unacceptable and have been abandoned.
- the prosthetic femoral stem component typically comprises a metal
- the prosthetic acetabular cup component typically comprises a metal seat with a plastic liner
- the prosthetic tibial component typically comprises a metal base topped with a plastic bearing surface
- the prosthetic femoral component typically comprises a metal.
- the present state of the art is currently dominated by the use of three different materials: titanium and its alloys, cobalt-based alloys and polyethylene plastics.
- the two metallic materials are generally used for structural constructs (e.g., constructs that must carry the loads transmitted through the joint), and polyethylene is generally used as a bearing material in the joints (e.g., to slide or rotate against an opposing metallic component) .
- Ceramic bearing couples have also been used in the art to some extent, but their use is relatively limited due to price and strength considerations.
- the vast majority of structural implant constructs are currently made from either titanium alloys (e.g., Ti6Al4V) or cobalt-based alloys (e.g. CoCr alloys, including CoCrMo alloys) .
- These materials have different advantages and disadvantages. More particularly, titanium alloys generally exhibit relatively high general fatigue strength, relatively low stiffness compared to alternative materials, and excellent biocompatibility properties. 5 Titanium alloys, however, also tend to suffer from notch sensitivity in fatigue, which significantly reduces the fatigue strength of the construct when the surface is notched, roughened or porous-coated. Titanium alloys are also prone to scratching and make
- CoCr alloys generally have relatively high fatigue strengths, are relatively notch insensitive, and are relatively tough and resistant to scratching, thus making them excellent candidates for forming
- CoCr alloys are also relatively stiff, which can cause load pattern problems when coupled with flexible human bones, and they are not as biocompatible as many other alloys due to their chrome, and in some cases nickel,
- hip femoral stem components have also been used on hip femoral stem components. More particularly, hip femoral stem components have been developed which comprise an inner core of CoCr covered with a coating of titanium for bone ingrowth. This layered construction is desirable because stems made entirely of titanium, with titanium ingrowth surfaces, are too weak, while stems that are made entirely of CoCr, with CoCr ingrowth surfaces, do not have adequate biocompatibility.
- the combination of these two materials in a single construct provides a stem that is strong enough and also has a good bone ingrowth surface. Another attempt to improve the biocompatibility of the bone ingrowth surface has been to coat the surface with hydroxyapatite (HA) .
- HA hydroxyapatite
- HA while it yields excellent short term results, has problems with long term stability due to its pH sensitivity. More particularly, the pH of the body may fluctuate due to a variety of conditions such as nutrition and disease, and this can undermine the effectiveness of HA bone ingrowth surface.
- Small abrasive particles can also migrate into the interface between the polyethylene bearing construct and the metal base construct and scratch the metal base construct, particularly where the metal base construct is formed out of titanium. This issue of "backside wear” has been a significant issue for research and debate over the last five years or so.
- This invention provides for a novel orthopedic prosthesis, specifically a prosthetic acetabular component for a prosthetic total hip joint, that comprises two constructs, one being a metal base construct that engages the bone and the other being a polyethylene bearing construct that attaches to the metal base construct and articulates with a prosthetic hip component on the opposing side of the joint.
- the metal base construct is composed of two different metals, one of which engages the bone surface and the other of which engages the polyethylene bearing construct. Each of these metals is selected so that its characteristics are well suited to its particular function.
- the first metal i.e., the one that engages the bone surface
- the second metal i.e., the one that engages the polyethylene bearing construct
- the first metal is selected so as to provide a superior bone-engaging face
- the second metal is selected so as to provide a superior polyethylene-engaging face.
- Fig. 1 is a schematic side view showing a prosthetic total hip joint positioned within a patient' s body
- Fig. 2 is an exploded schematic side view showing the prosthetic acetabular component of the prosthetic total hip joint shown in Fig. 1;
- Fig. 3 is a schematic side view of the prosthetic acetabular component of the prosthetic total hip joint shown in Fig. 1.
- a prosthetic total hip joint 5 which generally, comprises a prosthetic acetabular component 10 seated in a recess contained in a prepared hip 15, and a prosthetic femoral stem component 20 which is secured to the top end of a resected femur 25.
- Prosthetic acetabular component 10 is shown in greater detail in Figs. 2 and 3.
- Prosthetic acetabular component 10 generally comprises a metal base construct 30 and a polyethylene bearing construct 35.
- metal seat base construct 30 comprises a metal seat 40 with a rail 60 defining a 5 groove 65 therein.
- Polyethylene liner construct 35 comprises a domed top surface 75 having an annular flange 85.
- Flange 85 is sized to snap fit in the groove 65 of metal base construct 30, whereby polyethylene bearing construct 10 35 may be secured to metal base construct 30.
- the socket of the acetabulum of hip 15 is removed, metal base construct 30 is secured to hip 15 via screws 55 and press fit with the acetabulum. Then polyethylene liner construct 35 is seated into metal L5 base construct 30 until polyethylene bearing construct 35 engages the metal seat 40.
- metal base construct 30 is formed with a bimetal construction. More particularly, the metal base O construct 30 is composed of two different metals, a first metal 87 which engages hip 15 and a second metal 90 which engages polyethylene liner construct 35. Each of these metals is selected so that its characteristics are well suited to its particular function. More particularly, first metal 87 (i.e., the one that engages hip 15) is selected so as to provide a superior bone-engaging face, while second metal 90 (i.e., the one that engages polyethylene liner construct 35) is selected so as to provide a superior polyethylene-engaging face.
- first metal 87 i.e., the one that engages hip 15
- second metal 90 i.e., the one that engages polyethylene liner construct 35
- base metal construct 10 By combining the different material characteristics of two different metals in base metal construct 10, it is possible to simultaneously form a superior bone-engaging face and a superior polyethylene-engaging face. Among other things, by selecting two appropriate metals for the metal base construct, superior bone ingrowth can be achieved while still avoiding the aforementioned problems with "backside wear".
- a base metal construct 10 may be formed whose bone-engaging surfaces are formed from titanium and whose polyethylene-engaging surfaces are formed from CoCrMo. This construction places a good bone ingrowth metal against the bone and a good polyethylene-engaging metal against the polyethylene, whereby to provide a significantly superior prosthetic acetabular component 10. It is also possible to use other metals that are suitable in both strength, biocompatibility, and joinability to make the bimetal tibial component construct.
- first metal 87 may comprise titanium, titanium alloys, tantalum, tantalum alloys or other metals and/or metal alloys consistent with the present invention.
- first metal 87 is preferably a material which is highly biocompatible and which exhibits good bone ingrowth properties.
- second metal 90 may comprise CoCrMo, cobalt based alloys, stainless steels, zirconium based alloys or other metals and/or metal alloys consistent with the present invention.
- second metal 90 is preferably a material which has relatively high hardness and which is scratch resistant.
- the term bimetal may be defined as a composite of two metals, where each of the metals has a different primary constituent. The bimetal construct can be formed from two different commercially pure metals, from two alloys of different base metals, or a combination thereof.
- the bimetal construct can be fabricated using a variety of techniques.
- the bimetal construct is fabricated using the method disclosed in pending U.S. Patent Application Serial No. 09/079,502, which patent application is hereby incorporated herein by reference.
- the bimetal construct can be fabricated by other techniques such as plasma spray, diffusion bonding, sintering, or metallurgical methods, e.g., such as a method of the sort disclosed in U.S. Patent No. 5,323,954 (Shetty) .
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU2001282946A AU2001282946A1 (en) | 2000-07-20 | 2001-07-19 | Bimetal acetabular component construct for hip joint prosthesis |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21996200P | 2000-07-20 | 2000-07-20 | |
US60/219,962 | 2000-07-20 |
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WO2002007652A1 true WO2002007652A1 (en) | 2002-01-31 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/023126 WO2002007652A1 (en) | 2000-07-20 | 2001-07-19 | Bimetal acetabular component construct for hip joint prosthesis |
Country Status (2)
Country | Link |
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AU (1) | AU2001282946A1 (en) |
WO (1) | WO2002007652A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2408938A (en) * | 2003-12-12 | 2005-06-15 | Roozbeh Shirandami | Improved bearing compound of sandwich construction with layered stiffness for use in joint prosthesis |
US7108720B2 (en) | 2003-03-31 | 2006-09-19 | Depuy Products, Inc. | Reduced wear orthopaedic implant apparatus and method |
US9375316B2 (en) | 2001-02-23 | 2016-06-28 | Biomet Manufacturing, Llc. | Method and apparatus for acetabular reconstruction |
Citations (5)
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US5372130A (en) * | 1992-02-26 | 1994-12-13 | Djs&T Limited Partnership | Face mask assembly and method having a fan and replaceable filter |
US5725597A (en) * | 1995-11-09 | 1998-03-10 | Hwang; Sung Kwan | Artificial hip-joint |
US5879404A (en) * | 1996-04-23 | 1999-03-09 | Biomet Limited | Acetabular cups and methods of their manufacture |
US5938702A (en) * | 1997-10-31 | 1999-08-17 | Sulzer Orthopedics Inc. | Locking mechanism for acetabular cup |
US6087553A (en) * | 1996-02-26 | 2000-07-11 | Implex Corporation | Implantable metallic open-celled lattice/polyethylene composite material and devices |
-
2001
- 2001-07-19 AU AU2001282946A patent/AU2001282946A1/en not_active Abandoned
- 2001-07-19 WO PCT/US2001/023126 patent/WO2002007652A1/en active Application Filing
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US5372130A (en) * | 1992-02-26 | 1994-12-13 | Djs&T Limited Partnership | Face mask assembly and method having a fan and replaceable filter |
US5725597A (en) * | 1995-11-09 | 1998-03-10 | Hwang; Sung Kwan | Artificial hip-joint |
US6087553A (en) * | 1996-02-26 | 2000-07-11 | Implex Corporation | Implantable metallic open-celled lattice/polyethylene composite material and devices |
US5879404A (en) * | 1996-04-23 | 1999-03-09 | Biomet Limited | Acetabular cups and methods of their manufacture |
US5938702A (en) * | 1997-10-31 | 1999-08-17 | Sulzer Orthopedics Inc. | Locking mechanism for acetabular cup |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9375316B2 (en) | 2001-02-23 | 2016-06-28 | Biomet Manufacturing, Llc. | Method and apparatus for acetabular reconstruction |
US7108720B2 (en) | 2003-03-31 | 2006-09-19 | Depuy Products, Inc. | Reduced wear orthopaedic implant apparatus and method |
GB2408938A (en) * | 2003-12-12 | 2005-06-15 | Roozbeh Shirandami | Improved bearing compound of sandwich construction with layered stiffness for use in joint prosthesis |
GB2408938B (en) * | 2003-12-12 | 2006-05-10 | Shirandami Roozbeh | Improved bearing component of sandwich construction with layered stiffness for use in joint prosthesis |
Also Published As
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