US5135528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hockey stick chisel
Assignee: Individual
•
Filing: 1991-06-04
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Granted: 1992-08-04
•
Expires: 2011-06-04
Abstract
Abstract A medical instrument for performing a vertebral osteotomy comprising an elongated handle member having first and second ends and a curved blade member extending from the second end of the handle, which curved blade member terminates in a chisel at a forward edge. The forward tip of the chisel is chamfered so as to safeguard against contacting the spinal cord during the vertebral osteotomy.
Inventors
- 👤 Frederick Winston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:46
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1662; A61B17/1671; A61B17/1604
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A medical instrument for performing a vertebral osteotomy comprising: an elongated handle member having first and second ends, and a planar curved blade member extending from said second end of said handle and adapted to be inserted between adjacent vertebrae, said curved blade member terminating in a chisel at a forward edge thereof, said chisel having a chamfered non-cutting edge extending generally from said forward edge to an inner side of said chisel.
Claim 2
Dependent Claim
73 words
A medical instrument for performing a vertebral osteotomy comprising: an elongated handle member having first and second ends, and a planar curved blade member extending from said second end of said handle and adapted to be inserted between adjacent vertebrae, said curved blade member terminating in a chisel at a forward edge thereof, said chisel having a chamfered non-cutting edge extending generally from said forward edge to an inner side of said chisel.
Claim 3
Dependent Claim
16 words
The medical instrument of claim 1 wherein said curved blade member tapers gradually to said chisel.
Claim 4
Dependent Claim
20 words
The medical instrument of claim 2 wherein said curved blade member has a radius of curvature of about 0.31 inches.
Claim 5
Dependent Claim
25 words
The medical instrument of claim 2 wherein said curved blade member has a radius of curvature ranging from about 0.2 inches to about 0.5 inches.
Claim 6
Dependent Claim
24 words
The medical instrument of claim 4 wherein said curved blade member has a width dimension ranging from about 0.2 inches to about 0.5 inches.
Claim 7
Dependent Claim
29 words
The medical instrument of claim 5 wherein said curved blade member is oriented with respect to said handle member at an angle ranging between about 30° and about 70°.
Claim 8
Dependent Claim
30 words
The medical instrument of claim 6 wherein a forward tip of said chisel extends from said blade member in an amount ranging from about 0.2 inches to about 0.4 inches.
Claim 9
Dependent Claim
25 words
The medical instrument of claim 5 wherein said curved blade member is oriented with respect to said handle member at an angle of about 45°.
Claim 10
Dependent Claim
22 words
The medical instrument of claim 6 wherein a forward tip of said chisel extends from said blade member by about 0.31 inches.
Claim 11
Dependent Claim
19 words
The medical instrument of claim 4 wherein said curved blade member has a width dimension of about 0.31 inches.
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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) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |