US3924276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgically implantable trapezium prosthesis and method of reconstructing the thumb carpometacarpal joint
Assignee: Individual
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Filing: 1975-02-18
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Granted: 1975-12-09
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Expires: 1995-02-18
Abstract
Abstract A prosthesis for the trapezium of the thumb carpometacarpal joint comprising an integral elastomeric member configured to include a generally cylindrical portion, having extending from one end thereof an elongated, longitudinally extending tapered portion adapted to be embedded into a reamed out-channel in the thumb metacarpal bone, while the opposite end of said cylindrical portion is slightly concave to conform to the navicular bone, and wherein said cylindrical portion includes a transverse aperture. In the subject method following the step of implanting the tapered projection of the subject prosthesis in the thumb metacarpal bone, the axis of the aperture is aligned perpendicular to the plane of the thumb, and a segment of the flexor carpi radialis tendon is then passed over the cylindrical portion of said prosthesis and down through the aperture, and then fixed to the main portion of said tendon, thereby forming a reinforced structure to inhibit dislocation of the prosthesis.
Inventors
- 👤 Richard E Eaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:35
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4241; A61F2/4261; A61F2/08; A61F2/0811; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30069; A61F2002/30108; A61F2002/30199; A61F2002/30224; A61F2002/30299; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30878; A61F2002/4256; A61F2002/4258; A61F2002/4271; A61F2002/4274; A61F2002/4276; A61F2230/00; A61F2230/0063; A61F2230/0069; A61F2230/0093
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A prosthesis for the trapezium of the thumb metacarpal joint comprising an integral, elastomeric member configured to include a generally cylindrical portion, having extending from one end thereof an elongated, longitudinally extending tapered portion, and wherein said cylindrical portion includes a transverse aperture extending through the longitudinal axis of said prosthesis.
Claim 2
Dependent Claim
51 words
A prosthesis for the trapezium of the thumb metacarpal joint comprising an integral, elastomeric member configured to include a generally cylindrical portion, having extending from one end thereof an elongated, longitudinally extending tapered portion, and wherein said cylindrical portion includes a transverse aperture extending through the longitudinal axis of said prosthesis.
Claim 3
Dependent Claim
31 words
A prosthesis for the trapezium of the thumb metacarpal joint as in claim 1 wherein said elongated, longitudinally extending tapered portion is annular in cross section and includes a blunt end.
Claim 4
Dependent Claim
34 words
A prosthesis for the trapezium of the thumb metacarpal joint as in claim 1 wherein the opposite end of said cylindrical portion is slightly concave to conform to the end of the navicular bone.
Claim 5
Dependent Claim
20 words
A prosthesis for the trapezium of the thumb metacarpal joint as in claim 1 wherein said elastomeric is silicone rubber.
Claim 6
Independent Claim
193 words
A method of reconstructing the metacarpal joint of a thumb by surgically implanting an improved trapezium prosthesis having a cylindrical portion to which is integrally connected an elongated tapered portion, and with an aperture extending transversely through said cylindrical portion, comprising the steps of: a. removing the diseased trapezium; b. reaming the medullary canal of the thumb metacarpal bone to fit the elongated tapered portion of said prosthesis; c. inserting the prosthesis elongated tapered portion into said medullary canal, and aligning the aperture in the cylindrical portion of the prosthesis to extend perpendicular to the plane of the thumb nail; d. stripping away approximately a 6 centimeter portion of the flexor carpi radialis tendon, leaving the distal attachment intact adjacent the prosthesis; e. extending the split tendon around the surface of the prosthesis then passing the same through the aperture in the prosthesis to a point intersecting the remaining flexor radialis at tHe palm side of the hand, and suturing said split tendon to the flexor radialis tendon; f. weaving the remaining free end of the tendon in the vicinity of the prosthesis to form a new capsule securing the prosthesis in place.
Claim 7
Independent Claim
193 words
A method of reconstructing the metacarpal joint of a thumb by surgically implanting an improved trapezium prosthesis having a cylindrical portion to which is integrally connected an elongated tapered portion, and with an aperture extending transversely through said cylindrical portion, comprising the steps of: a. removing the diseased trapezium; b. reaming the medullary canal of the thumb metacarpal bone to fit the elongated tapered portion of said prosthesis; c. inserting the prosthesis elongated tapered portion into said medullary canal, and aligning the aperture in the cylindrical portion of the prosthesis to extend perpendicular to the plane of the thumb nail; d. stripping away approximately a 6 centimeter portion of the flexor carpi radialis tendon, leaving the distal attachment intact adjacent the prosthesis; e. extending the split tendon around the surface of the prosthesis then passing the same through the aperture in the prosthesis to a point intersecting the remaining flexor radialis at tHe palm side of the hand, and suturing said split tendon to the flexor radialis tendon; f. weaving the remaining free end of the tendon in the vicinity of the prosthesis to form a new capsule securing the prosthesis in place.
References Cited (Backward Citations)
US3745590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |