Acetabular components that decrease risks of dislocation

• US 20030050703A1
• Filed: 05/15/2002
• Published: 03/13/2003
• Est. Priority Date: 07/31/2000
• Status: Active Grant

• Current Assignee: Massachusetts General Hospital (Mass General Brigham, Inc.)
• Original Assignee: Massachusetts General Hospital (Mass General Brigham, Inc.)
• Inventors: Harris, William H., Hoeffel, Daniel P., Burroughs, Brian R.
• Granted Patent: US 7,169,186 B2
• Time in Patent Office: Days
• US Class Current: 623/22.2
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/34 Acetabular cups
• 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 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/3054 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
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30606 Sets comprising both cemented and non-cemented endoprostheses
• CPC Class Codes: A61F 2002/30685 Means for reducing or preventing the generation of wear particulates
• CPC Class Codes: A61F 2002/3233 having anti-luxation means for preventing complete dislocation of the femoral head from the acetabular cup
• CPC Class Codes: A61F 2002/3241 having a ring, e.g. for locking the femoral head into the acetabular cup
• CPC Class Codes: A61F 2002/3443 with an anti-luxation elevated rim portion, e.g. on the inner shell
• CPC Class Codes: A61F 2002/3446 Single cups
• CPC Class Codes: A61F 2002/349 Shell having a wavy or undulated peripheral rim
• CPC Class Codes: A61F 2002/3493 Spherical shell significantly greater than a hemisphere, e.g. extending over more than 200 degrees
• CPC Class Codes: A61F 2002/3611 Heads or epiphyseal parts of femur
• CPC Class Codes: A61F 2002/3625 Necks
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• 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 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
• CPC Class Codes: A61L 2430/24 : for joint reconstruction
• CPC Class Codes: A61L 27/16 : obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C08L 23/06 : Polyethene

Abstract

The present invention provides monopolar acetabular liners that can enclose a femoral head to form a hip replacement prosthesis, wherein the liner has a rim that creates an orifice, wherein the orifice has a diameter that is smaller than the diameter of the femoral head, and wherein the liner encompasses greater than 50 percent of the volume of the head, wherein a constraining ring can be used in conjunction with the monopolar constrained acetabular liner to provide additional support for the femoral head to stay with the acetabular liner and avoid dislocation. Assemblies, complete prosthetic replacements, and methods of replacing also are provided. Liners and constraining rings having no, one or more recesses also are provided.

Claims

1. A monopolar acetabular liner that can enclose a femoral head to form a hip replacement prostheses, wherein the liner has a rim that creates an orifice, and wherein the orifice has a diameter that is smaller than the diameter of the femoral head.

2. The liner according to claim 1, wherein the rim extends beyond the center line of the head when the head is enclosed by the liner.

3. The liner according to claim 1, wherein the liner comprises polyethylene.

4. The liner according to claim 3, wherein comprises ultra high molecular weight polyethylene.

5. The liner according to claim 4, wherein ultra high molecular weight polyethylene is cross-linked.

6. The liner according to claim 5, wherein the cross-linking is performed via irradiation.

7. The liner according to claim 1, wherein the femoral head has a large diameter.

8. The liner according to claim 1, wherein the liner has at least one recess.

9. A monopolar acetabular assembly comprising

(A) a monopolar acetabular liner that encloses a femoral head, wherein the liner has a rim that creates an orifice, and wherein the orifice has a diameter that is smaller than the diameter of the femoral head;

and

(B) a metal shell.

10. The assembly according to claim 9, wherein the rim extends beyond the center line of the head when the head is enclosed by the liner.

11. The assembly according to claim 9, wherein the metal shell is made of titanium or chrome cobalt.

12. The assembly according to claim 9, wherein the femoral head has a large diameter.

13. The assembly according to claim 9, wherein the liner has at least one recess.

14. A hip joint replacement assembly comprising

(A) a monopolar acetabular liner that encloses a femoral head, wherein the liner has a rim that creates an orifice, and wherein the orifice has a diameter that is smaller than the diameter of the femoral head;

(B) a metal shell; and

(C) a femoral head.

15. The replacement assembly according to claim 14, wherein the femoral head is integral with or modular on a femoral stem.

16. The replacement assembly according to claim 14, wherein the femoral head is made of a cobalt chrome alloy, stainless steel, or ceramic.

17. The replacement assembly according to claim 15, wherein the femoral stem is made of a cobalt chrome alloy, stainless steel, or titanium.

18. The replacement assembly according to claim 14, wherein the rim extends beyond the center line of the head when the head is enclosed by the liner.

19. The replacement assembly according to claim 14, wherein the metal shell is made of titanium, stainless steel, or a cobalt chrome alloy.

20. The replacement assembly according to claim 14, wherein the femoral head has a large diameter.

21. The replacement assembly according to claim 14, wherein the liner has at least one recess.

22. A method of replacing a hip in a patient in need thereof, comprising the step of surgically implanting in a patient a monopolar acetabular liner or monopolar component that can enclose a femoral head to form a hip replacement prostheses, wherein the liner has a rim that creates an orifice, and wherein the orifice has a diameter that is smaller than the diameter of the femoral head.

23. The method according to claim 22, wherein a metal shell also is implanted.

24. The method according to claim 22, wherein a femoral head and stem also are implanted.

25. The method according to claim 22, wherein the rim extends beyond the center line of the head when the head is enclosed by the liner.

26. The method according to claim 22, wherein the liner comprises ultra high molecular weight polyethylene.

27. The method according to claim 26, wherein ultra high molecular weight polyethylene is cross-linked.

28. The method according to claim 27, wherein the cross-linking is performed via irradiation.

29. The method according to claim 22, wherein the femoral head has a large diameter.

30. The method according to claim 22, wherein the liner has at least one recess.

31. A monopolar acetabular liner that can enclose a femoral head to form a hip replacement prostheses, wherein the liner has a rim that creates an orifice and the liner has at least one recess, and wherein the orifice has a diameter that is smaller than the diameter of the femoral head.

32. The monopolar acetabular liner according to claim 31, wherein the liner has at least two recesses.

33. A monopolar acetabular assembly comprising

(A) a monopolar acetabular liner that encloses a femoral head, wherein the liner has a rim that creates an orifice and the liner has at least one recess, and wherein the orifice has a diameter that is smaller than the diameter of the femoral head;

and

(B) a metal shell.

34. The monopolar acetabular assembly according to claim 33, wherein the liner has at least two recesses.

35. A hip joint replacement assembly comprising:

(A) a monopolar acetabular liner that encloses a femoral head, wherein the liner has a rim that creates an orifice and the liner has at least one recess, and wherein the orifice has a diameter that is smaller than the diameter of the femoral head;

(B) a metal shell; and

(C) a femoral head.

36. The hip joint assembly according to claim 35, wherein the liner has at least two recesses.

37. A method of replacing a hip in a patient in need thereof, comprising the step of surgically implanting in a patient a monopolar acetabular liner or monopolar component that can enclose a femoral head to form a hip replacement prostheses, wherein the liner has a rim that creates an orifice and the liner has at least one recess, and wherein the orifice has a diameter that is smaller than the diameter of the femoral head.

38. The method according to claim 37, wherein the liner has at least two recesses.

39. A constraining ring that is used in conjunction with a monopolar constrained acetabular liner or a cut away monopolar constrained acetabular liner, wherein the ring fits around the perimeter of the monopolar constrained acetabular liner, and wherein the ring is set onto the acetabular liner during the operative procedure after the femoral head is reduced into the acetabular liner.

40. The constraining ring according to claim 39, wherein the shape of the ring is circular.

41. The constraining ring according to claim 39, wherein the ring is made of high strength materials such as cobalt chrome alloy, titanium, or stainless steel.

42. The constraining ring according to claim 39, wherein the ring is a single piece.

43. The constraining ring according to claim 39, has no recess.

44. The constraining ring according to claim 39, has at least one recess.

45. The constraining ring according to claim 39, has at least two recesses.

46. The liner according to claim 39, has no recess.

47. The liner according to claim 39, has at least one recess.

48. The liner according to claim 39, has at least two recesses.

49. A monopolar constrained acetabular liner system with constraining ring assembly comprising:

(A) a monopolar acetabular liner that encloses a femoral head, wherein the liner has a rim that creates an orifice, wherein the orifice has a diameter that is smaller than the diameter of the femoral head, wherein a constraining ring fits around the perimeter of the monopolar constrained acetabular liner, wherein the constraining ring is set onto the acetabular liner during the operative procedure after the femoral head is reduced into the acetabular liner; and

(B) a metal shell.

50. The assembly according to claim 49, wherein the constraining ring fastens directly to the polyethylene acetabular liner and has no direct contact with the metal shell into which the liner is set.

51. The assembly according to claim 49, wherein the constraining ring is not dependent on the use of a metal shell hence allowing this system to be used with an acetabular liner which is cemented directly into the acetabulum.

52. The assembly according to claim 49, wherein the constraining ring can be secured to the acetabular liner by means of a number of locking mechanisms.

53. The assembly according to claim 49, wherein the shape of the constraining ring is circular.

54. The assembly according to claim 49, wherein the constraining ring is made of high strength materials such as cobalt chrome alloy, titanium, or stainless steel.

55. The assembly according to claim 49, wherein the constraining ring is a single piece.

56. The assembly according to claim 49, wherein the constraining ring has no recess.

57. The assembly according to claim 49, wherein the constraining ring has at least one recess.

58. The assembly according to claim 49, wherein the constraining ring has at least two recesses.

59. The assembly according to claim 49, wherein the liner has no recess.

60. The assembly according to claim 49, wherein the liner has at least one recess.

61. The assembly according to claim 49, wherein the liner has at least two recesses.

62. A hip joint replacement assembly comprising:

(A) a monopolar acetabular liner that encloses a femoral head, wherein the liner has a rim that creates an orifice, wherein the orifice has a diameter that is smaller than the diameter of the femoral head, wherein a constraining ring fits around the perimeter of the monopolar constrained acetabular liner, wherein the constraining ring is set onto the acetabular liner during the operative procedure after the femoral head is reduced into the acetabular liner;

(B) a metal shell; and

(C) a femoral head.

63. The hip joint assembly according to claim 62, wherein the constraining ring fastens directly to the polyethylene acetabular liner and has no direct contact with the metal shell into which the liner is set.

64. The hip joint assembly according to claim 62, wherein the constraining ring is not dependent on the use of a metal shell hence allowing this system to be used with an acetabular liner which is cemented directly into the acetabulum.

65. The hip joint assembly according to claim 62, wherein the constraining ring can be secured to the acetabular liner by means of a number of locking mechanisms.

66. The hip joint assembly according to claim 62, wherein the shape of the constraining ring is circular.

67. The hip joint assembly according to claim 62, wherein the constraining ring is made of high strength materials such as cobalt chrome alloy, titanium, or stainless steel.

68. The hip joint assembly according to claim 62, wherein the constraining ring is a single piece.

69. The hip joint assembly according to claim 62, wherein the constraining ring has no recess.

70. The hip joint assembly according to claim 62, wherein the constraining ring has at least one recess.

71. The hip joint assembly according to claim 62, wherein the constraining ring has at least two recesses.

72. The hip joint assembly according to claim 62, wherein the liner has no recess.

73. The hip joint assembly according to claim 62, wherein the liner has at least one recess.

74. The hip joint assembly according to claim 62, wherein the liner has at least two recesses.

75. A method of replacing a hip in a patient in need thereof, comprising the step of surgically implanting in a patient a monopolar acetabular liner or monopolar component that can enclose a femoral head to form a hip replacement prostheses, wherein the liner has a rim that creates an orifice, wherein the orifice has a diameter that is smaller than the diameter of the femoral head, wherein a constraining ring is used with the monopolar constrained acetabular liner or a cut away monopolar constrained acetabular liner, wherein the constraining ring fits around the perimeter of the constrained acetabular liner, wherein the constraining ring can be set onto the acetabular liner during the operative procedure after the femoral head is reduced into the acetabular liner.

76. The method according to claim 75, wherein the constraining ring fastens directly to the polyethylene acetabular liner and has no direct contact with the metal shell into which the liner is set.

77. The method according to claim 75, wherein the constraining ring is not dependent on the use of a metal shell hence allowing this system to be used with an acetabular liner which is cemented directly into the acetabulum.

78. The method according to claim 75, wherein the constraining ring can be secured to the acetabular liner by means of a number of locking mechanisms.

79. The method according to claim 75, wherein the shape of the constraining ring is circular.

80. The method according to claim 75, wherein the constraining ring is made of high strength materials such as cobalt chrome alloy, titanium, or stainless steel.

81. The method according to claim 75, wherein the constraining ring is a single piece.

82. The method according to claim 75, wherein the constraining ring has no recess.

83. The method according to claim 75, wherein the constraining ring has at least one recess.

84. The method according to claim 75, wherein the constraining ring has at least two recesses.

85. The method according to claim 75, wherein the liner has no recess.

86. The method according to claim 75, wherein the liner has at least one recess.

87. The method according to claim 75, wherein the liner has at least two recesses.

88. A cut away monopolar constrained acetabular liner system with constraining ring assembly comprising:

a monopolar acetabular liner that encloses a femoral head, wherein the liner has a rim that creates an orifice, wherein the orifice has a diameter that is smaller than the diameter of the femoral head, wherein a constraining ring is used with the monopolar constrained acetabular liner or the cut away monopolar constrained acetabular liner, wherein the constraining ring fits around the perimeter of the constrained acetabular liner, and wherein the constraining ring is set onto the acetabular liner during the operative procedure after the femoral head is reduced into the acetabular liner.

89. The assembly according to claim 88, wherein the constraining ring fastens directly to the polyethylene acetabular liner.

90. The assembly according to claim 88, wherein the constraining ring is not dependent on the use of a metal shell hence allowing this system to be used with an acetabular liner which is cemented directly into the acetabulum.

91. The assembly according to claim 88, wherein the constraining ring can be secured to the acetabular liner by means of a number of locking mechanisms.

92. The assembly according to claim 88, wherein the shape of the constraining ring is circular.

93. The assembly according to claim 88, wherein the constraining ring is made of high strength materials such as cobalt chrome alloy, titanium, or stainless steel.

94. The assembly according to claim 88, wherein the constraining ring is a single piece.

95. The assembly according to claim 88, wherein the constraining ring has no recess.

96. The assembly according to claim 88, wherein the constraining ring has at least one recess.

97. The assembly according to claim 88, wherein the constraining ring has at least two recesses.

98. The assembly according to claim 88, wherein the liner has no recess.

99. The assembly according to claim 88, wherein the liner has at least one recess.

100. The assembly according to claim 88, wherein the liner has at least two recesses.

101. A hip joint replacement assembly comprising:

(A) a monopolar acetabular liner that encloses a femoral head, wherein the liner has a rim that creates an orifice, wherein the orifice has a diameter that is smaller than the diameter of the femoral head, wherein a constraining ring fits around the perimeter of the monopolar constrained acetabular liner, wherein the constraining ring is set onto the acetabular liner during the operative procedure after the femoral head is reduced into the acetabular liner; and

(B) a femoral head.

102. The hip joint assembly according to claim 101, wherein the constraining ring fastens directly to the polyethylene acetabular liner.

103. The hip joint assembly according to claim 101, wherein the constraining ring is not dependent on the use of a metal shell hence allowing this system to be used with an acetabular liner which is cemented directly into the acetabulum.

104. The hip joint assembly according to claim 101, wherein the constraining ring can be secured to the acetabular liner by means of a number of locking mechanisms.

105. The hip joint assembly according to claim 101, wherein the shape of the constraining ring is circular.

106. The hip joint assembly according to claim 101, wherein the constraining ring is made of high strength materials such as cobalt chrome alloy, titanium, or stainless steel.

107. The hip joint assembly according to claim 101, wherein the constraining ring is a single piece.

108. The hip joint assembly according to claim 101, wherein the constraining ring has no.

109. The hip joint assembly according to claim 101, wherein the constraining ring has at least one recess.

110. The hip joint assembly according to claim 101, wherein the constraining ring has at least two recesses.

111. The hip joint assembly according to claim 101, wherein the liner has no recess.

112. The hip joint assembly according to claim 101, wherein the liner has at least one recess.

113. The hip joint assembly according to claim 101, wherein the liner has at least two recesses.

114. A method of replacing a hip in a patient in need thereof, comprising the step of surgically implanting in a patient a monopolar acetabular liner or monopolar component that can enclose a femoral head to form a hip replacement prostheses, wherein the liner has a rim that creates an orifice, wherein the orifice has a diameter that is smaller than the diameter of the femoral head, wherein a constraining ring is used with a monopolar constrained acetabular liner or a cut away monopolar constrained acetabular liner, wherein the constraining ring fits around the perimeter of the constrained liner, wherein the constraining ring can be set onto the acetabular liner during the operative procedure after the femoral bead is reduced into the acetabular liner.

115. The method according to claim 114, wherein the constraining ring fastens directly to the polyethylene acetabular liner.

116. The method according to claim 114, wherein the constraining ring is not dependent on the use of a metal shell hence allowing this system to be used with an acetabular liner which is cemented directly into the acetabulum.

117. The method according to claim 114, wherein the constraining ring can be secured to the acetabular liner by means of a number of locking mechanisms.

118. The method according to claim 114, wherein the shape of the constraining ring is circular.

119. The method according to claim 114, wherein the constraining ring is made of high strength materials such as cobalt chrome alloy, titanium, or stainless steel.

120. The method according to claim 114, wherein the constraining ring is a single piece.

121. The method according to claim 114, wherein the constraining ring has no recess.

122. The method according to claim 114, wherein the constraining ring has at least one recess.

123. The method according to claim 114, wherein the constraining ring has at least two recesses.

124. The method according to claim 114, wherein the liner has no recess.

125. The method according to claim 114, wherein the liner has at least one recess.