US5147365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Patellar osteotomy guide
Assignee: Zimmer Inc
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Filing: 1991-08-19
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Granted: 1992-09-15
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Expires: 2011-08-19
Abstract
Abstract A patella osteotomy guide comprising a plier-like appliance with curved jaws for grasping a patient's patella. A row of teeth faces inwardly from the jaws. The teeth are generally of pyramid shape, but a vertex of each tooth lies in a plane containing a bottom side of the respective jaw. Each of the jaws has an integral saw capture slot and the tips of the jaws are extended. A rotating, calibrated stylus measures the position of the patella with respect to the integral saw capture slots. The rotating stylus also functions as a pivot or fulcrum about which the jaws and handles of the osteotomy guide rotate. Handles for the osteotomy guide are offset from the plane of the jaws. The rotating stylus can be displaced up and down and then locked into a selected position using a draw bar and captured balls. A bowed retaining ring imparts a certain amount of pre-load to the stylus and draw bar assembly to hold the assembly in a selected position.
Inventors
- 👤 Steven I. Whitlock
- 👤 Steven G. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:57
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/14; A61B17/15; A61B17/154; A61B17/158; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3877
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
129 words
An apparatus for guiding a sagittal saw during resection of a bone comprising means for gripping the bone; slot means integral with said gripping means for receiving a blade of the sagittal saw and defining a plane of resection for said sagittal saw; and means setting a depth of resection to be made in the bone by the sagittal saw, said depth setting means comprising a stylus for contacting an exposed surface of said bone; means for displacing said stylus in a linear direction substantially perpendicular to said plane of resection; means for locking said stylus at a selected linear displacement; and means for rotating said stylus about an axis parallel to said linear direction, said rotating means being operable independently of said displacing means and said locking means.
Claim 2
Independent Claim
129 words
An apparatus for guiding a sagittal saw during resection of a bone comprising means for gripping the bone; slot means integral with said gripping means for receiving a blade of the sagittal saw and defining a plane of resection for said sagittal saw; and means setting a depth of resection to be made in the bone by the sagittal saw, said depth setting means comprising a stylus for contacting an exposed surface of said bone; means for displacing said stylus in a linear direction substantially perpendicular to said plane of resection; means for locking said stylus at a selected linear displacement; and means for rotating said stylus about an axis parallel to said linear direction, said rotating means being operable independently of said displacing means and said locking means.
Claim 3
Dependent Claim
38 words
The apparatus according to claim 1 wherein the bone gripping means comprise opposed arms, each arm having a jaw and a handle, the opposed arms being pivotally joined at a fulcrum intermediate of said jaw and said handle.
Claim 4
Dependent Claim
60 words
The apparatus according to claim 2 wherein the jaws each comprise a generally planar bottom surface, said bottom surfaces being generally co-planar, and an opposed concave interior surface, said interior surface having a plurality of inwardly directed spikes, each spike defining at least one vertex for gripping the bone, said vertices lying substantially in the plane of said bottom surfaces.
Claim 5
Dependent Claim
36 words
The apparatus according to claim 3 wherein the jaws further comprise an extended tip at an end of the jaw remote from the fulcrum, said tip extending said slot means beyond said opposed concave interior surfaces.
Claim 6
Dependent Claim
45 words
The apparatus according to claim 1 wherein the rotating means comprise a pivoting cylinder having a bore parallel to an axis of said cylinder, said bore defining at least one interior wall and wherein the displacing means comprises a shaft slidably received within said bore.
Claim 7
Dependent Claim
55 words
The apparatus according to claim 5 wherein the shaft comprises an axial bore and wherein the locking means further comprise a draw bar slidably received within said axial bore, at least one means for engaging said interior wall, and means attached to said draw bar for urging said wall engaging means against said interior wall.
Claim 8
Dependent Claim
26 words
The apparatus according to claim 6 wherein the wall engaging means comprise a ball and wherein the urging means comprise a groove in said draw bar.
Claim 9
Dependent Claim
38 words
The apparatus according to claim 7 wherein the bone gripping means comprise opposed arms, each arm having a jaw and a handle, the opposed arms being pivotally joined at a fulcrum intermediate of said jaw and said handle.
Claim 10
Dependent Claim
60 words
The apparatus according to claim 8 wherein the jaws each comprise a generally planar bottom surface, said bottom surfaces being generally co-planar, and an opposed concave interior surface, said interior surface having a plurality of inwardly directed spikes, each spike defining at least one vertex for gripping the bone, said vertices lying substantially in the plane of said bottom surfaces.
Claim 11
Dependent Claim
36 words
The apparatus according to claim 9 wherein the jaws further comprise an extended tip at an end of the jaw remote from the fulcrum, said tip extending said slot means beyond said opposed concave interior surfaces.
Claim 12
Dependent Claim
15 words
The apparatus according to claim 8 wherein said pivoting cylinder is located at said fulcrum.
Claim 13
Dependent Claim
20 words
The apparatus according to claim 11 further comprising means for displacing said handles from a plane defined by said jaws.
Claim 14
Dependent Claim
22 words
The apparatus according to claim 12 wherein said pivoting cylinder further comprises means for providing a resistance to rotation of said cylinder.
Claim 15
Dependent Claim
24 words
The apparatus according to claim 13 wherein the resistance providing means comprise a spring-loaded, bowed split ring engaging an annular groove in said cylinder.
Claim 16
Dependent Claim
60 words
The apparatus according to claim 14 wherein the jaws each comprise a generally planar bottom surface, said bottom surfaces being generally co-planar, and an opposed concave interior surface, said interior surface having a plurality of inwardly directed spikes, each spike defining at least one vertex for gripping the bone, said vertices lying substantially in the plane of said bottom surfaces.
Claim 17
Dependent Claim
36 words
The apparatus according to claim 15 wherein the jaws further comprise an extended tip at an end of the jaw remote from the fulcrum, said tip extending said slot means beyond said opposed concave interior surfaces.
References Cited (Backward Citations)
US4633862A
Cited
US5021055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |