US5053036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Point contact bone compression plate
Assignee: Synthes USA LLC
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Filing: 1990-03-08
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Granted: 1991-10-01
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Expires: 2010-03-08
Abstract
Abstract A bone plate for use in osteosynthesis having a plurality of contact elements extending from its lower surface so that contact between plate and bone is reduced to the minimum contact needed during attachment of the plate to a bone.
Inventors
- 👤 Stephan N. Perren
- 👤 Fritz Straumann
- 👤 Franz Sutter
- 👤 Slobodan Tepic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:22
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/80; A61B17/8052; A61B17/8028; A61B17/8033; A61B17/8047; A61B17/809
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
87 words
A compression plate for osteosynthesis, said plate having a longitudinal axis, an upper surface, a lower surface and a plurality of screw holes spaced in the direction of the longitudinal axis, said lower surface being arched concavely transversely to the longitudinal axis of the plate, in combination with open sections along the side edges of the plate between the screw holes, said open sections, with the concave lower surface of the plate, forming studs along the side edges of the lower surface for contact with a bone.
Claim 2
Dependent Claim
87 words
A compression plate for osteosynthesis, said plate having a longitudinal axis, an upper surface, a lower surface and a plurality of screw holes spaced in the direction of the longitudinal axis, said lower surface being arched concavely transversely to the longitudinal axis of the plate, in combination with open sections along the side edges of the plate between the screw holes, said open sections, with the concave lower surface of the plate, forming studs along the side edges of the lower surface for contact with a bone.
Claim 3
Dependent Claim
63 words
A compression plate according to claim 1 wherein said screw holes are conical and traverse said plate between said upper and lower surfaces such that the narrow end of the cone is towards the lower surface, said holes adapted to receive screws having conical heads of a predetermined cone angle, such that the plate will not slide down the heads of the screws.
Claim 4
Dependent Claim
22 words
A bone plate according to claim 2 wherein the taper of the conic section is in the range of 1:5 to 1:20.
Claim 5
Dependent Claim
15 words
A bone plate according to claim 1 wherein one screw hole is a self-compressing hole.
Claim 6
Dependent Claim
26 words
A bone plate according to claim 1 wherein the contact elements are less than 5% of the total area of the lower surface of the plate.
Claim 7
Dependent Claim
26 words
A bone plate according to claim 1 wherein the contact elements are less than 2% of the total area of the lower surface of the plate.
Claim 8
Dependent Claim
107 words
A metallic compression plate for osteosynthesis, said plate having a longitudinal axis, an upper surface, a lower surface, side walls joining said upper and lower surfaces and a plurality of screw holes spaced in the direction of said longitudinal axis, in combination with a plurality of individual, non-metallic, support studs attached to the lower surface of the plate at the sides of said lower surface and longitudinally spaced in the direction of said axis, said studs providing bone contact, at selected points along the sides of said plate, and spacing the central portion of the lower surface of said plate along the longitudinal axis from the bone.
Claim 9
Dependent Claim
107 words
A metallic compression plate for osteosynthesis, said plate having a longitudinal axis, an upper surface, a lower surface, side walls joining said upper and lower surfaces and a plurality of screw holes spaced in the direction of said longitudinal axis, in combination with a plurality of individual, non-metallic, support studs attached to the lower surface of the plate at the sides of said lower surface and longitudinally spaced in the direction of said axis, said studs providing bone contact, at selected points along the sides of said plate, and spacing the central portion of the lower surface of said plate along the longitudinal axis from the bone.
Claim 10
Dependent Claim
24 words
A bone plate according to claim 7 wherein the contact elements comprise studs made of material which is resorbable or dissolvable in body fluids.
Claim 11
Dependent Claim
108 words
A bone plate assembly comprising a compression bone plate and a plurality of bone screws for attaching said plate to a bone, said plate having a longitudinal axis, an upper surface, a lower surface and a plurality of screw holes for receiving said screws, spaced in the direction of the longitudinal axis, said lower surface being arched concavely transversely to the longitudinal axis of the plate, in combination with open sections along the side edges of the plate between the screw holes, said open sections, with the concave undersurface of the plate, forming studs for bone contact along the side edges of the lower surface of the plate.
Claim 12
Dependent Claim
108 words
A bone plate assembly comprising a compression bone plate and a plurality of bone screws for attaching said plate to a bone, said plate having a longitudinal axis, an upper surface, a lower surface and a plurality of screw holes for receiving said screws, spaced in the direction of the longitudinal axis, said lower surface being arched concavely transversely to the longitudinal axis of the plate, in combination with open sections along the side edges of the plate between the screw holes, said open sections, with the concave undersurface of the plate, forming studs for bone contact along the side edges of the lower surface of the plate.
Claim 13
Dependent Claim
25 words
A bone plate assembly according to claim 9 wherein the screws the heads which are expandable by means of a body inserted into said head.
Claim 14
Dependent Claim
37 words
A bone plate assembly according to claim 9 and comprising a body fitted into the screw hole, said body being expandable by a conical screw head which has a cone angle smaller than the resulting friction angle.
Claim 15
Dependent Claim
23 words
A bone plate assembly according to claim 11 wherein the taper of the cone angle is in the range of 1:5 to 1:20.
Claim 16
Dependent Claim
29 words
A bone plate assembly according to claim 9 wherein said screws are of a length that permits engagement of the screw with only one side of the bone cortex.
Claim 17
Dependent Claim
78 words
A compression plate for osteosynthesis, said plate having a longitudinal axis, an upper surface, a lower surface and a plurality of screw holes spaced in the direction of the longitudinal axis, said lower surface being arched concavely, transversely to the longitudinal axis of the plate, in combination with arcuate cut out sections between the holes, the intersection of surfaces formed by said cut out sections and the concave lower surface of the plate forming studs for bone contact.
Claim 18
Dependent Claim
78 words
A compression plate for osteosynthesis, said plate having a longitudinal axis, an upper surface, a lower surface and a plurality of screw holes spaced in the direction of the longitudinal axis, said lower surface being arched concavely, transversely to the longitudinal axis of the plate, in combination with arcuate cut out sections between the holes, the intersection of surfaces formed by said cut out sections and the concave lower surface of the plate forming studs for bone contact.
Claim 19
Dependent Claim
96 words
A compression plate for osteosynthesis, said plate having a longitudinal axis, an upper surface, a concave lower surface, side walls joining said upper and lower surfaces and a plurality of screw holes spaced in the direction of said longitudinal axis, in combination with a plurality of clips removably attached to said plate and spaced along the length of said plate, each of said clips extending across the upper surface of the plate, down the side walls thereof and having elements extending below the lower surface of said plate to provide a limited area of bone contact.
Claim 20
Dependent Claim
96 words
A compression plate for osteosynthesis, said plate having a longitudinal axis, an upper surface, a concave lower surface, side walls joining said upper and lower surfaces and a plurality of screw holes spaced in the direction of said longitudinal axis, in combination with a plurality of clips removably attached to said plate and spaced along the length of said plate, each of said clips extending across the upper surface of the plate, down the side walls thereof and having elements extending below the lower surface of said plate to provide a limited area of bone contact.
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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) | 1994-09-30 | 1995-04-01 | 1995-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-30 | 1999-04-01 | 1999-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-30 | 2003-04-01 | 2003-10-01 | $7700.00 | Window Closed / Lapsed |