US4283799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-coated body implant
Assignee: Massachusetts Institute of Technology
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Filing: 1979-09-10
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Granted: 1981-08-18
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Expires: 1999-09-10
Abstract
Abstract A pre-coated body implant, such as, for example, a hip prosthesis, in which that portion of the implant that attaches to or is inserted into a skeletal member of the body has a pre-coating of a material (e.g., an acrylic material) covering all or most of said portion and bonded thereto.
Inventors
- 👤 George W. Pratt, Jr.
- 👤 Robert Poss
- 👤 Jeremy K. Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:10
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30907; A61L; A61L27/00; A61L27/28; A61L27/34; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30014; A61F2/32; A61F2/36; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2/3662; A61F2002/3678; A61F2002/3686; A61F2250/00; A61F2250/0014; A61F2250/0018; A61F2310/00; A61F2310/00389; A61F2310/00952
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A method of implanting a prosthesis into a skeletal member of a human, that comprises: preparing a cavity in the skeletal member to receive the prosthesis which comprises a stem that is introduced into said cavity, covering the surface of the cavity with a cement coating, applying a cement pre-coating to said stem prior to insertion into said cavity, permitting the cement both in the cavity and on the stem to cure, applying a further quantity of the cement into the cavity and introducing the stem into the cavity.
Claim 2
Independent Claim
89 words
A method of implanting a prosthesis into a skeletal member of a human, that comprises: preparing a cavity in the skeletal member to receive the prosthesis which comprises a stem that is introduced into said cavity, covering the surface of the cavity with a cement coating, applying a cement pre-coating to said stem prior to insertion into said cavity, permitting the cement both in the cavity and on the stem to cure, applying a further quantity of the cement into the cavity and introducing the stem into the cavity.
Claim 3
Dependent Claim
44 words
The method of claim 1 wherein the method further comprises the step of shaping the outer surface of the cement precoating after the precoating is applied so as to enhance bonding and positioning of the prosthesis upon introduction of the stem into the cavity.
Claim 4
Dependent Claim
43 words
The method of claim 1 wherein the step of applying a cement pre-coating to the prosthesis stem further comprises applying a pre-coating having an elastic modulus intermediate that of the stem and that of the cement which is applied to fill the cavity.
Claim 5
Dependent Claim
29 words
The method of claim 1 wherein the step of applying a cement pre-coating to the prosthesis stem further comprises applying a thin methylmethacrylate cement pre-coating to the prosthesis stem.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |