Patent US5507823A successfully refreshed from Google Patents.
US5507823A
Expired / Lapsed
US
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Joint prosthesis having PTFE cushion
Assignee: Individual
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Filing: 1994-09-15
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Granted: 1996-04-16
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Expires: 2014-09-15
Abstract
Abstract A joint prosthesis for interconnecting the ends of adjoining bones includes a cushion of expanded PTFE having at least two facets for attachment to the bones. The cushion may or may not include stems for insertion into the bones. An optional sheath surrounds the non-facet surfaces of the cushion for preventing adherence of tissue. The motion of the prosthesis is defined or limited by the orientation of the facets and/or by the porosity of the cushion and/or by an insert within the cushion.
Inventors
- 👤 D. Kenneth Walston
- 👤 Lawrence M. Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4241; A61L; A61L27/00; A61L27/14; A61L27/16; A61F2/30767; A61F2/30907; A61F2/3094; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30006; A61F2002/30011; A61F2002/3006; A61F2002/30069; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30131; A61F2002/30138; A61F2002/30153; A61F2002/30159; A61F2002/30166; A61F2002/30316; A61F2002/30535; A61F2002/30563; A61F2002/30565; A61F2002/30571; A61F2/30771; A61F2002/30878; A61F2002/4251; A61F2002/4256; A61F2002/4258; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0013; A61F2230/0017; A61F2230/0019; A61F2230/0028; A61F2250/00; A61F2250/0014; A61F2250/0015; A61F2250/0023; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49801; Y10T29/49826; Y10T29/49863; Y10T29/4987
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
96 words
A joint prosthesis for replacing a natural joint between a first bone and a second bone which can move relative to the first bone, said prosthesis imitating the motion of the natural joint by interconnecting the adjoining ends of said first bone and said second bone, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene having a first facet for attachment to said first bone and a second facet for attachment to said second bone; wherein said cushion permits a bi-axial motion between said facets and a sideward motion in response to shear forces on said facets.
Claim 2
Dependent Claim
96 words
A joint prosthesis for replacing a natural joint between a first bone and a second bone which can move relative to the first bone, said prosthesis imitating the motion of the natural joint by interconnecting the adjoining ends of said first bone and said second bone, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene having a first facet for attachment to said first bone and a second facet for attachment to said second bone; wherein said cushion permits a bi-axial motion between said facets and a sideward motion in response to shear forces on said facets.
Claim 3
Dependent Claim
18 words
The prosthesis as set forth in claim 1 wherein said first facet is parallel to said second facet.
Claim 4
Dependent Claim
20 words
The prosthesis as set forth in claim 1 wherein said first facet is tilted with respect to said second facet.
Claim 5
Dependent Claim
46 words
The prosthesis as set forth in claim 1 and further comprising: a first stem attached to and extending from said first facet; and a second stem attached to and extending from said second facet; wherein the facets and stems are more rigid than the expanded polytetrafluoroethylene.
Claim 6
Dependent Claim
38 words
The prosthesis as set forth in claim 4 wherein said first stem and said second stem have a cross-section which prevents rotation of said prosthesis when said prosthesis is attached to said first bone and said second bone.
Claim 7
Dependent Claim
20 words
The prosthesis as set forth in claim 4 wherein said first stem and said second stem have a circular cross-section.
Claim 8
Dependent Claim
23 words
The prosthesis as set forth in claim 1 and further comprising: an insert within said cushion for limiting the motion of said cushion.
Claim 9
Dependent Claim
21 words
The prosthesis as set forth in claim 1 wherein said cushion is more porous at said facets than between said facets.
Claim 10
Dependent Claim
21 words
The prosthesis as set forth in claim 1 wherein said cushion is less porous at said facets than between said facets.
Claim 11
Dependent Claim
16 words
The prosthesis as set forth in claim 1 and further including a sheath surrounding said cushion.
Claim 12
Dependent Claim
13 words
The prosthesis as set forth in claim 10 wherein said sheath is non-porous.
Claim 13
Dependent Claim
20 words
The prosthesis as set forth in claim 10 wherein said sheath is characterized by a lower porosity than said cushion.
Claim 14
Dependent Claim
76 words
A joint prosthesis for interconnecting the adjoining ends of a first bone and a second bone, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene; a sheath partially surrounding said cushion, said sheath having a first open end and a second open end; wherein said cushion is adapted to be attached to said first bone through said first open end and said cushion is adapted to be attached to said second bone through said second open end.
Claim 15
Dependent Claim
76 words
A joint prosthesis for interconnecting the adjoining ends of a first bone and a second bone, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene; a sheath partially surrounding said cushion, said sheath having a first open end and a second open end; wherein said cushion is adapted to be attached to said first bone through said first open end and said cushion is adapted to be attached to said second bone through said second open end.
Claim 16
Dependent Claim
13 words
The prosthesis as set forth in claim 13 wherein said sheath is non-porous.
Claim 17
Dependent Claim
20 words
The prosthesis as set forth in claim 13 wherein said sheath is characterized by a lower porosity than said cushion.
Claim 18
Dependent Claim
65 words
A joint prosthesis for interconnecting the adjoining ends of metacarpophalangeal bones, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene having a first facet adapted to be connected to a first metacarpophalangeal bone and a second facet adapted to be connected to a second metacarpophalangeal bone; wherein said cushion is more porous at said facets than between said facets for promoting ingrowth of the metacarpophalangeal bone.
Claim 19
Dependent Claim
65 words
A joint prosthesis for interconnecting the adjoining ends of metacarpophalangeal bones, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene having a first facet adapted to be connected to a first metacarpophalangeal bone and a second facet adapted to be connected to a second metacarpophalangeal bone; wherein said cushion is more porous at said facets than between said facets for promoting ingrowth of the metacarpophalangeal bone.
Claim 20
Dependent Claim
17 words
The prosthesis as set forth in claim 16 and further including a sheath partially surrounding said cushion.
Claim 21
Dependent Claim
13 words
The prosthesis as set forth in claim 17 wherein said sheath is non-porous.
Claim 22
Dependent Claim
17 words
The prosthesis as set forth in claim 17 wherein said sheath is less porous than said facets.
Claim 23
Dependent Claim
139 words
A joint prosthesis for replacing a natural joint between a first bone and a second bone which can move relative to the first bone, said prosthesis imitating the motion of the natural joint by interconnecting the adjoining ends of said first bone and said second bone, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene having a first facet for attachment to said first bone and a second facet for attachment to said second bone; a first stem attached to and extending from said first facet; and a second stem attached to and extending from said second facet; wherein said cushion permits at least bi-axial motion between said facets and a sideward motion in response to shear forces on said facets, said prosthesis further comprising: an insert within said cushion for limiting the motion of said cushion along an axis.
Claim 24
Dependent Claim
139 words
A joint prosthesis for replacing a natural joint between a first bone and a second bone which can move relative to the first bone, said prosthesis imitating the motion of the natural joint by interconnecting the adjoining ends of said first bone and said second bone, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene having a first facet for attachment to said first bone and a second facet for attachment to said second bone; a first stem attached to and extending from said first facet; and a second stem attached to and extending from said second facet; wherein said cushion permits at least bi-axial motion between said facets and a sideward motion in response to shear forces on said facets, said prosthesis further comprising: an insert within said cushion for limiting the motion of said cushion along an axis.
Claim 25
Dependent Claim
21 words
The prosthesis as set forth in claim 20 and further including a sheath surrounding at least a portion of said cushion.
Claim 26
Dependent Claim
107 words
A joint prosthesis for replacing a natural joint between a first bone and a bone which can move relative to the first bone, said prosthesis imitating the motion of the natural joint by interconnecting the adjoining ends of said first bone and said second bone, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene having a first facet for attachment to said first bone and a second facet for attachment to said second bone; a first stem attached to and extending from said first facet; and a second stem attached to and extending from said second facet; and a sheath surrounding at least a portion of said cushion.
Claim 27
Dependent Claim
107 words
A joint prosthesis for replacing a natural joint between a first bone and a bone which can move relative to the first bone, said prosthesis imitating the motion of the natural joint by interconnecting the adjoining ends of said first bone and said second bone, said prosthesis comprising: a cushion of expanded polytetrafluoroethylene having a first facet for attachment to said first bone and a second facet for attachment to said second bone; a first stem attached to and extending from said first facet; and a second stem attached to and extending from said second facet; and a sheath surrounding at least a portion of said cushion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-16 | 1999-10-16 | 2000-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-16 | 2003-10-16 | 2004-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-16 | 2007-10-16 | 2008-04-16 | $7700.00 | Window Closed / Lapsed |