US5601553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking plate and bone screw
Assignee: Synthes USA LLC
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Filing: 1994-10-03
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Granted: 1997-02-11
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Expires: 2014-10-03
Abstract
Abstract A bone plate for stabilizing the anterior column of the spine has a lower curved surface and an upper surface having two intersecting planes in each of which is a screw hole, the axes of the holes being skewed relative to one another. A bone screw used to secure the plate, has a single start buttress thread near the tip and a two start machine thread near the head, the threads being continuous and of constant pitch.
Inventors
- 👤 Linda Trebing
- 👤 John Thalgott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:00
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8605; A61B17/14; A61B17/15; A61B17/16; A61B17/17; A61B17/1728; A61B17/70; A61B17/7059; A61B17/80; A61B17/8061; A61B17/8625; A61B17/863; A61B17/1739; A61B17/1757; A61B17/8004; A61B17/8052; A61B17/8057
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
76 words
A bone plate comprising an upper surface and a lower surface for application to a bone, the lower surface being curved to conform to a cylindrical bone and the upper surface having two flat intersecting planes, a first screw hole having an axis normal to one of said intersecting planes and a second screw hole having an axis normal to the other intersecting plane, said planes providing directional guides for insertion of screws in said holes.
Claim 2
Dependent Claim
76 words
A bone plate comprising an upper surface and a lower surface for application to a bone, the lower surface being curved to conform to a cylindrical bone and the upper surface having two flat intersecting planes, a first screw hole having an axis normal to one of said intersecting planes and a second screw hole having an axis normal to the other intersecting plane, said planes providing directional guides for insertion of screws in said holes.
Claim 3
Dependent Claim
22 words
The bone plate claimed in claim 1 and having a third screw hole which is unthreaded and furnished with a camming surface.
Claim 4
Dependent Claim
93 words
A bone plate for stabilizing the anterior column of the spine comprising an elongated body of physiologically acceptable metals having a longitudinal axis having a bottom surface curved about its longitudinal axis and having an anterior edge and a posterior edge extending generally parallel to the longitudinal axis, said anterior edge having a notch and screw holes at the ends of said notch, the posterior edge being concave and extending in a continuous uninterrupted curve in a plane containing the longitudinal axis, there being screw holes at the ends of said posterior edge.
Claim 5
Dependent Claim
93 words
A bone plate for stabilizing the anterior column of the spine comprising an elongated body of physiologically acceptable metals having a longitudinal axis having a bottom surface curved about its longitudinal axis and having an anterior edge and a posterior edge extending generally parallel to the longitudinal axis, said anterior edge having a notch and screw holes at the ends of said notch, the posterior edge being concave and extending in a continuous uninterrupted curve in a plane containing the longitudinal axis, there being screw holes at the ends of said posterior edge.
Claim 6
Dependent Claim
12 words
The bone plate claimed in claim 3, said screw holes being threaded.
Claim 7
Dependent Claim
15 words
The bone plate claimed in claim 4 and comprising a plurality of unthreaded screw holes.
Claim 8
Dependent Claim
32 words
The bone plate claimed in claim 1 wherein said screw holes are threaded to receive locking screws, said plate comprising at least one additional hole, unthreaded, to receive a temporary anchoring screw.
Claim 9
Dependent Claim
28 words
The bone plate claimed in claim 6, said plate having an anterior edge and a posterior edge, said anterior edge having a notch for receiving a manipulation instrument.
Claim 10
Dependent Claim
20 words
The bone plate claimed in claim 7 wherein said posterior edge is concave and extends in a continuous uninterrupted curve.
Claim 11
Dependent Claim
93 words
A bone plate comprising an upper surface and a lower surface, the lower surface being curved for application to a bone and the upper surface having two flat intersecting planes, in combination with at least one screw hole in each of the planes of said upper surface, said screw holes having axes which are skewed with respect to one another and in separate planes, each axis being normal to the plane of the surface on which it is situated, the planes providing a directional guide for insertion of screws into said screw holes.
Claim 12
Dependent Claim
93 words
A bone plate comprising an upper surface and a lower surface, the lower surface being curved for application to a bone and the upper surface having two flat intersecting planes, in combination with at least one screw hole in each of the planes of said upper surface, said screw holes having axes which are skewed with respect to one another and in separate planes, each axis being normal to the plane of the surface on which it is situated, the planes providing a directional guide for insertion of screws into said screw holes.
Claim 13
Dependent Claim
19 words
The bone plate claimed in claim 9 and also including a plurality of elongated screw holes having camming surfaces.
Claim 14
Dependent Claim
98 words
A bone screw comprising a shaft, a head and an unthreaded pointed tip, said shaft having an upper section adjacent the head and a lower cylindrical section adjacent the tip, the lower section having a first unthreaded part next to the tip and a second part having a single start buttress thread, and the upper section having a two-start machine screw thread, the threads taken as a whole being of constant pitch and the lead being continuous over both threads, the minor diameter of said machine screw thread being greater than the minor diameter of said buttress thread.
Claim 15
Dependent Claim
98 words
A bone screw comprising a shaft, a head and an unthreaded pointed tip, said shaft having an upper section adjacent the head and a lower cylindrical section adjacent the tip, the lower section having a first unthreaded part next to the tip and a second part having a single start buttress thread, and the upper section having a two-start machine screw thread, the threads taken as a whole being of constant pitch and the lead being continuous over both threads, the minor diameter of said machine screw thread being greater than the minor diameter of said buttress thread.
Claim 16
Dependent Claim
13 words
The screw claimed in claim 8 and having cutting plates adjacent said tip.
Claim 17
Dependent Claim
57 words
An orthopaedic fixation system for use in spinal surgery comprising a bone plate having a plurality of threaded screw holes for receiving locking screws and a plurality of locking screws, each of said screws having a section of single start buttress threads and a section of two-start machine threads the lead being continuous over said two sections.
Claim 18
Dependent Claim
57 words
An orthopaedic fixation system for use in spinal surgery comprising a bone plate having a plurality of threaded screw holes for receiving locking screws and a plurality of locking screws, each of said screws having a section of single start buttress threads and a section of two-start machine threads the lead being continuous over said two sections.
Claim 19
Dependent Claim
30 words
The orthopaedic fixation system claimed in claim 13 wherein the major diameter of the buttress thread is greater than the minor diameter of the thread in the threaded screw holes.
Claim 20
Dependent Claim
110 words
An orthopedic fixation system for use in spinal surgery comprising a bone plate having a lower surface for application to the spinal column, an upper surface having two flat intersecting planes and a threaded screw hole in each of said planes, each of said screw holes having an axis normal to the plane on which it is situated, in combination with a screw for each of said screw holes, each of said screws having a buttress thread for engagement with cancellous bone and a machine screw thread for engagement with said screw holes and cortical bone, the planes providing a directional guide for insertion of screws into said screw holes.
Claim 21
Dependent Claim
110 words
An orthopedic fixation system for use in spinal surgery comprising a bone plate having a lower surface for application to the spinal column, an upper surface having two flat intersecting planes and a threaded screw hole in each of said planes, each of said screw holes having an axis normal to the plane on which it is situated, in combination with a screw for each of said screw holes, each of said screws having a buttress thread for engagement with cancellous bone and a machine screw thread for engagement with said screw holes and cortical bone, the planes providing a directional guide for insertion of screws into said screw holes.
Claim 22
Independent Claim
81 words
A method for applying a bone plate having a threaded screw hole and an unthreaded screw hole to a bone which comprises positioning said plate adjacent the bone surface, then inserting a bone screw through said unthreaded screw hole into the bone temporarily to fix said plate to the bone and then securing the plate to the bone by inserting a screw through the threaded screw hole in engagement with the threads in said hole and into engagement with said bone.
Claim 23
Independent Claim
81 words
A method for applying a bone plate having a threaded screw hole and an unthreaded screw hole to a bone which comprises positioning said plate adjacent the bone surface, then inserting a bone screw through said unthreaded screw hole into the bone temporarily to fix said plate to the bone and then securing the plate to the bone by inserting a screw through the threaded screw hole in engagement with the threads in said hole and into engagement with said bone.
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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) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |