US4488319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of two-stage implantation of a joint prosthesis and prosthetic product
Assignee: Clemson University
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Filing: 1981-10-26
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Granted: 1984-12-18
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Expires: 2001-10-26
Abstract
Abstract A two step surgical technique for implantation of a joint prosthesis. A bone cavity adjacent the effected joint is prepared for receipt of a prosthetic stem having porosities therealong for dynamic bony interfacial fixation and a tip adapted for subsequent removable securement to a joint element. The effected joint is resectioned in a subsequent second surgical technique and the opposing joint component is prepared for receipt of a prosthetic joint. The prosthetic joint is then implanted and removably secured to said previously implanted stem. A two piece implantable prosthesis is also disclosed and claimed.
Inventors
- 👤 Andreas F. von Recum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:37
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3609
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
An improved method for implantation of a joint prosthesis comprising the steps of: (a) surgically implanting of prosthetic stem in a bone cavity adjacent said joint while avoiding disruption of said joint, said stem being adapted for dynamic bony interfacial fixation along at least a portion of the length of same, a tip of said stem being adapted for receipt of a prosthetic joint element; (b) permitting adequate dynamic bony interfacial fixation between said stem and bony tissue within said bone cavity for securement of said stem; and (c) thereafter removing said joint in a second surgical procedure and implanting a prosthetic joint element therefor while securing said joint element to said stem.
Claim 2
Dependent Claim
113 words
An improved method for implantation of a joint prosthesis comprising the steps of: (a) surgically implanting of prosthetic stem in a bone cavity adjacent said joint while avoiding disruption of said joint, said stem being adapted for dynamic bony interfacial fixation along at least a portion of the length of same, a tip of said stem being adapted for receipt of a prosthetic joint element; (b) permitting adequate dynamic bony interfacial fixation between said stem and bony tissue within said bone cavity for securement of said stem; and (c) thereafter removing said joint in a second surgical procedure and implanting a prosthetic joint element therefor while securing said joint element to said stem.
Claim 3
Dependent Claim
54 words
The method as defined in claim 1 wherein said joint is a hip, and said stem is implanted by obtaining direct access to the medullary cavity, reaming said cavity, and force fitting the stem into said cavity, said stem having a porous outer surface along at least a portion of the length of same.
Claim 4
Dependent Claim
45 words
The method as defined in claim 2 wherein after the stem is secured, the joint is approached through a second surgical procedure, the femoral head and neck is removed, and a prosthetic femoral head and neck is implanted, said neck being secured to said stem.
Claim 5
Dependent Claim
30 words
The method as defined in claim 3 wherein after removal of the femoral head and neck, a bony bed is prepared in the femur for receipt of the prosthetic neck.
Claim 6
Dependent Claim
35 words
The method as defined in claim 4 wherein said neck is secured in said bony bed to preclude transmission of rotational forces from the head and neck through the stem onto the stem bone interface.
Claim 7
Dependent Claim
26 words
The method as defined in claim 4 wherein said neck is secured to said stem to preclude against relative rotation of the head and the stem.
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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) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |