US3816854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthesis for total arthroplasty of the elbow joint
Assignee: Individual
•
Filing: 1973-07-03
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Granted: 1974-06-18
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Expires: 1993-07-03
Abstract
Abstract A prosthesis for total replacement arthroplasty of the elbow joint consists of a hinge joint having two intramedullary stems adapted for insertion into the medullary canals of the humerus and the ulna respectively, and which is articulated at the time of operation. The free end of one of the stems is formed with an integral partial cylinder within which is secured a cylindrical bearing member formed of ultra high density polyethylene having an axial bore for receiving a pivot pin carried on the free end of the other stem. A radial slot in the bearing member, of a width slightly less than the diameter of the pivot pin, allows the pin to be snapped into the bore of the bearing member to form the hinge joint.
Inventors
- 👤 A Schlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:37
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3804; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30131; A61F2002/30138; A61F2002/30154; A61F2002/30316; A61F2002/30329; A61F2002/30476; A61F2002/305; A61F2002/30621; A61F2002/30624; A61F2/30767; A61F2/30771; A61F2002/3082; A61F2002/30878; A61F2002/3813; A61F2002/3822; A61F2002/3831; A61F2/46; A61F2002/4631; A61F2220/00; A61F2220/0025; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0013; A61F2230/0017; A61F2230/0021; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
168 words
Prosthesis for total replacement of the elbow joint of humans comprising, first and second elongated stems formed of a metal alloy which is essentially nonreactive with body tissue, said first stem having a U-shaped member integrally joined to and extending from one end thereof, a pivot pin secured to and extending between the arms of said Ushaped member, said second stem having a bearing member integrally joined to one end thereof, said bearing member including a cylindrical non-metallic member having an axial bore of substantially the same diameter as said pivot pin for supporting said pivot pin to form a hinge joint, said non-metallic member having a slot extending radially from the bore to the outer surface thereof and having a width sufficiently smaller than the diameter of said pivot pin that said pin is normally retained in the bore yet allows the pivot pin to be forced through the slot to permit articulation of the hinge joint after insertion of said items in their respective intramedullary canals.
Claim 2
Dependent Claim
168 words
Prosthesis for total replacement of the elbow joint of humans comprising, first and second elongated stems formed of a metal alloy which is essentially nonreactive with body tissue, said first stem having a U-shaped member integrally joined to and extending from one end thereof, a pivot pin secured to and extending between the arms of said Ushaped member, said second stem having a bearing member integrally joined to one end thereof, said bearing member including a cylindrical non-metallic member having an axial bore of substantially the same diameter as said pivot pin for supporting said pivot pin to form a hinge joint, said non-metallic member having a slot extending radially from the bore to the outer surface thereof and having a width sufficiently smaller than the diameter of said pivot pin that said pin is normally retained in the bore yet allows the pivot pin to be forced through the slot to permit articulation of the hinge joint after insertion of said items in their respective intramedullary canals.
Claim 3
Dependent Claim
94 words
Prosthesis in accordance with claim 1, wherein said bearing member comprises a hollow partial cylinder formed of the same material and integrally joined to said second stem with its longitudinal axis perpendicular to the longitudinal axis of the stem, and wherein said cylindrical member is formed of high density polyethylene and is secured within said partial cylinder with the bore coaxial with the axis of the cylinder and with said slot lying in a plane which includes the axis of the cylinder and is substantially perpendicular to the longitudinal axis of said second stem.
Claim 4
Dependent Claim
36 words
Prosthesis in accordance with claim 2, wherein the longitudinal axis of said first stem is offset approximately 7* from an imaginary plane including the longitudinal axis of said second stem and perpendicularly bisecting said pivot pin.
Claim 5
Dependent Claim
39 words
Prosthesis in accordance with claim 3, wherein the bore in said cylindrical member is truncated so as to have a slightly larger diameter at its extremities than at its midpoint for allowing lateral toggle action of the hinge joint.
Claim 6
Dependent Claim
16 words
Prosthesis in accordance with claim 3, wherein said first stem is shorter than said second stem.
Claim 7
Dependent Claim
13 words
Prosthesis in accordance with claim 3, wherein said stems are of square cross-section.
Claim 8
Dependent Claim
73 words
Prosthesis in accordance with claim 2, wherein said hollow partial cylinder has an inner diameter to receive said cylindrical member with a press fit and encompasses an arc of at least 180* and has a plurality of bosses protruding from the inner wall thereof each engaging a respective one of a corresponding number of depressions formed in the outer surface of said cylindrical member for securing said cylindrical member within said partial cylinder.
Claim 9
Dependent Claim
34 words
Prosthesis in accordance with claim 2, wherein said partial cylinder is formed with stops for engaging the arms of said U-shaped member to limit the included angle between the two stems to approximately 180*.
Claim 10
Dependent Claim
139 words
In a prosthesis consisting of a hinge joint having a pivot pin and a bearing member pivotally engaging the pivot pin, an improved bearing member comprising, a hollow partial cylinder formed of a metal alloy which is essentially nonreactive with body tissue, and which encompasses an arc of at least 180*, and a cylindrical member formed of high density polyethylene and having an axial bore and an outer diameter substantially equal to the inner diameter of said partial cylinder secured within said partial cylinder, said partial cylinder having a plurality of bosses protruding from the inner wall thereof and distributed over its arcuate length each engaging a respective one of a corresponding number of similarly distributed depressions formed in the outer surface of said cylindrical member for preventing axial movement of the cylindrical member relative to the partial cylinder.
Claim 11
Dependent Claim
139 words
In a prosthesis consisting of a hinge joint having a pivot pin and a bearing member pivotally engaging the pivot pin, an improved bearing member comprising, a hollow partial cylinder formed of a metal alloy which is essentially nonreactive with body tissue, and which encompasses an arc of at least 180*, and a cylindrical member formed of high density polyethylene and having an axial bore and an outer diameter substantially equal to the inner diameter of said partial cylinder secured within said partial cylinder, said partial cylinder having a plurality of bosses protruding from the inner wall thereof and distributed over its arcuate length each engaging a respective one of a corresponding number of similarly distributed depressions formed in the outer surface of said cylindrical member for preventing axial movement of the cylindrical member relative to the partial cylinder.
References Cited (Backward Citations)
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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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |