Implantable Joint Prosthesis

• US 20090093887A1
• Filed: 12/22/2006
• Published: 04/09/2009
• Est. Priority Date: 01/09/2006
• Status: Abandoned Application

• Current Assignee: Silesco Pty Ltd
• Original Assignee: Silesco Pty Ltd
• Inventors: Walter, William Lindsay, Gillies, Ronald Mark, Donohoo, Shane
• Application Number:
  US12/087,503
• Publication Number:
  US 20090093887A1
• Time in Patent Office: Days
• US Class Current: 623/22.11
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/30721 Accessories
• CPC Class Codes: A61F 2/30724 Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/36 Femoral heads ; Femoral endoprostheses
• CPC Class Codes: A61F 2/3603 implanted without ablation of the whole natural femoral head endoprosthetic cartilage A61F2/30756
• CPC Class Codes: A61F 2/3662 Femoral shafts
• CPC Class Codes: A61F 2/367 Proximal or metaphyseal parts of shafts trochanteric devices connected to said proximal parts A61F2/30739
• CPC Class Codes: A61F 2/3672 Intermediate parts of shafts
• CPC Class Codes: A61F 2/3676 Distal or diaphyseal parts of shafts
• CPC Class Codes: A61F 2/46 Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
• CPC Class Codes: A61F 2/468 Testing instruments for artificial joints for testing non-implantable prostheses A61F2/76
• CPC Class Codes: A61F 2/481 Acoustic or audible means
• CPC Class Codes: A61F 2002/30004 the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
• CPC Class Codes: A61F 2002/30014 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2002/30024 differing in coefficient of friction
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30156 triangular
• CPC Class Codes: A61F 2002/30179 X-shaped
• CPC Class Codes: A61F 2002/302 : toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30322 : differing in surface structures
• CPC Class Codes: A61F 2002/30324 : differing in thickness
• CPC Class Codes: A61F 2002/30331 : made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30332 : Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30367 : with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30387 : Dovetail connection
• CPC Class Codes: A61F 2002/30403 : Longitudinally-oriented cooperating ribs and grooves on mating lateral surfaces of a mainly longitudinal connection
• CPC Class Codes: A61F 2002/30405 : made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30433 : using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30474 : using an intermediate sleeve interposed between both prosthetic parts to be coupled
• CPC Class Codes: A61F 2002/30476 : locked by an additional locking mechanism
• CPC Class Codes: A61F 2002/30495 : using a locking ring
• CPC Class Codes: A61F 2002/30514 : using a locking washer
• CPC Class Codes: A61F 2002/30563 : having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
• CPC Class Codes: A61F 2002/30581 : having a pocket filled with fluid, e.g. liquid
• CPC Class Codes: A61F 2002/30593 : hollow
• CPC Class Codes: A61F 2002/30695 : Sound-damping or noise-reducing means
• CPC Class Codes: A61F 2002/30733 : Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property
• CPC Class Codes: A61F 2002/30779 : arcuate
• CPC Class Codes: A61F 2002/30787 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30789 : perpendicular with respect to each other
• CPC Class Codes: A61F 2002/30795 : Blind bores, e.g. of circular cross-section
• CPC Class Codes: A61F 2002/30822 : Circumferential grooves
• CPC Class Codes: A61F 2002/30827 : Plurality of grooves
• CPC Class Codes: A61F 2002/3083 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30878 : with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30919 : Sleeves
• CPC Class Codes: A61F 2002/30943 : using mathematical models
• CPC Class Codes: A61F 2002/30971 : Laminates, i.e. layered products
• CPC Class Codes: A61F 2002/3241 : having a ring, e.g. for locking the femoral head into the acetabular cup
• CPC Class Codes: A61F 2002/3401 : with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/3406 : Oblong apertures
• CPC Class Codes: A61F 2002/3417 : the outer shell having protrusions on meridian lines, e.g. equidistant fins or wings around the equatorial zone
• CPC Class Codes: A61F 2002/342 : the outer shell having circumferential protrusions parallel to the equatorial plane, e.g. circumferential fins or wings
• CPC Class Codes: A61F 2002/3432 : having apertures for receiving fixation screws
• CPC Class Codes: A61F 2002/3448 : Multiple cups made of three or more concentric shells fitted or nested into one another
• CPC Class Codes: A61F 2002/3611 : Heads or epiphyseal parts of femur
• CPC Class Codes: A61F 2002/3625 : Necks
• CPC Class Codes: A61F 2002/365 : Connections of heads to necks
• CPC Class Codes: A61F 2002/368 : with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow shaft
• CPC Class Codes: A61F 2002/3694 : with longitudinal bores
• CPC Class Codes: A61F 2002/4631 : the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2002/4671 : for measuring resonant frequency
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0041 : using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0008 : elliptical or oval
• CPC Class Codes: A61F 2230/0023 : triangular
• CPC Class Codes: A61F 2230/0058 : X-shaped
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2250/0014 : having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
• CPC Class Codes: A61F 2250/0018 : differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2250/0021 : differing in coefficient of friction
• CPC Class Codes: A61F 2250/0026 : differing in surface structures
• CPC Class Codes: A61F 2250/0036 : differing in thickness
• CPC Class Codes: A61F 2310/00011 : Metals or alloys
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures

Abstract

An implantable joint prosthesis configured such that it does not squeak during movements of a subject. The joint prosthesis includes a means to modify the dynamic response of parts of the prosthesis such the response is not audible to the human ear.

Claims

1. An implantable joint prosthesis comprising:

a first component attachable to a first bone of a recipient; and

a second component attachable to a second bone of a recipient,

wherein said first and second components are arranged to facilitate relative movement between said first and second bone of the recipient, and at least one of said first and/or second components comprises at least one modifying means, said modifying means modifying the first and/or second component such that a dynamic response of at least a part of the first and/or second component to a stimulus is modified.

2. The implantable joint prosthesis of claim 1 wherein the dynamic response comprises a resonant frequency of at least a part of the first and/or second components.

3. The implantable joint prosthesis of claim 1 wherein a magnitude of the dynamic response is modified.

4. The implantable joint prosthesis of claim 3 wherein any noise resulting from a resonance of said at least a part of the first and/or second component is reduced to a level that is not audible to a human.

5. The implantable joint prosthesis of claim 1 wherein a frequency of the dynamic response is modified.

6. The implantable joint prosthesis of claim 5 wherein the frequency of the dynamic response is modified to greater than 7 KHz.

7. The implantable joint prosthesis of claim 5 wherein the frequency of the dynamic response is modified to greater than 10 KHz.

8. The implantable joint prosthesis of claim 5 wherein the frequency of the dynamic response is modified to a range of 10 KHz to 20 KHz.

9. The implantable joint prosthesis of claim 5 wherein the frequency of the dynamic response is modified to a frequency greater than 20 KHz.

10. The implantable joint prosthesis of claim 1 wherein both a magnitude a particular frequency of the dynamic response are modified.

11. The implantable joint prosthesis of claim 1, wherein the implantable joint prosthesis is an an implantable hip prosthesis, wherein said first component comprises a femoral component and said second component comprises an acetabular component having an acetabular cup shaped to receive an insert therein.

12. The implantable joint prosthesis of claim 11 wherein the modifying means comprises one or more shape modifying members of the acetabular component.

13. The implantable joint prosthesis of claim 12 wherein the shape modifying members comprise one or more ribs or struts wherein said ribs or struts extend outwardly from an outer surface of the acetabular component.

14. The implantable joint prosthesis of claim 11 wherein the modifying means comprises at least one stiffness modifying member of the acetabular component.

15. The implantable joint prosthesis of claim 14 wherein the stiffness modifying member comprises one or more ribs or struts wherein said ribs or struts extend outwardly from an outer surface of the acetabular component.

16. The implantable joint prosthesis of claim 14 wherein the stiffness modifying member comprises a ring member that is stiffer than the acetabular cup.

17. The implantable joint prosthesis of claim 16 wherein the ring member is made from the same material as the material of the acetabular cup and includes stiffening features to increase the stiffness of the ring member.

18. The implantable joint prosthesis of claim 17 wherein the stiffening features comprise one or more extension members that extend from the ring member.

19. The implantable joint prosthesis of claim 16 wherein the ring member is made from a different material to the material of the acetabular cup.

20. The implantable joint prosthesis of claim 16 wherein the ring member extends substantially circumferentially around an outer surface of the acetabular cup.

21. The implantable joint prosthesis of claim 11 wherein the modifying means comprises a locking mechanism.

22. The implantable joint prosthesis of claim 21 wherein the locking mechanism comprises a locking member positioned on the insert of the acetabular component and a complementary receiving member on the acetabular cup.

23. An acetabular component of an implantable hip prosthesis, said acetabular component having a main axis and a cup member shaped to receive an insert member substantially therein, wherein the insert member and the cup member are coupled together by a primary locking mechanism, said primary locking mechanism retaining the insert member and the cup member in coupling engagement when said acetabular component is subjected to a load substantially along said main axis;

and

the acetabular component includes a secondary locking mechanism to couple together the insert member and the cup member.

24. The acetabular component of claim 23 wherein said secondary locking mechanism retains the insert member and the cup member in coupling engagement when said acetabular component is subjected to a load that deviates from said main axis.

25. The acetabular component of claim 24 wherein the secondary locking mechanism retains the insert member and the cup member in locking engagement when the load applied to the acetabular component is at an angle to the main axis.

26. The acetabular component of claim 25 wherein the angle of the load is between 1°

and 90°

relative to the main axis.

27. The acetabular component of claim 23 wherein the secondary locking mechanism modifies the dynamic response of at least a part of the acetabular component to a stimulus.

28. The acetabular component of claim 27 wherein the dynamic response comprises the resonant frequency of at least a part of the acetabular component.

29. The acetabular component of claim 23 wherein the secondary locking mechanism comprises a first locking member on the insert member and a second locking member on the cup member.

30. The acetabular component of claim 29 wherein the first locking member comprises an extension member of the insert and the second locking member comprises a recessed portion of the cup member and wherein the recessed portion is substantially configured to receive the extension member.

31. The acetabular component of claim 30 wherein the insert member further includes an intermediate member that extends around at least a portion of an outer surface of the insert member, and the intermediate member comprises said extension member.

32. The acetabular component of claim 23 wherein the secondary locking mechanism comprises at least one stiffness modifying member of the cup member.

33. The acetabular component of claim 32 wherein the stiffness modifying member comprises one or more ribs or struts on an outer surface of the cup member.

34. The acetabular component of claim 32 wherein said stiffness modifying member comprises a ring member stiffer than the cup member.

35. The acetabular component of claim 34 wherein the ring member includes stiffening members.

36. The acetabular component of claim 35 wherein the stiffening members include ribs or struts extending from the ring member

37. The acetabular component of claim 34 wherein the cup member is made of titanium alloy and the ring member is made of a different material to the material of the cup member including cobalt chrome alloy and stainless steel.

38. The acetabular component of claim 34 wherein the ring member extends substantially circumferentially around the entire circumference of the cup member.