EP0195455B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Cranial screw
Assignee: Codman and Shurtleff Inc
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Filing: 1986-03-21
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Granted: 1990-02-28
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Expires: 2006-03-21
Abstract
No abstract record available.
Inventors
- 👤 Robert George Kraus
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 10:40
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/864; A61B5/00; A61B5/03; A61B5/031; A61B90/00; A61B90/10; A61B90/11; A61B2017/00831; A61B2017/00902; A61B90/03; A61B2090/037; A61B2090/103; A61B2562/00; A61B2562/16; A61B2562/17
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A cranial screw (10) having a hollow shank (12) which has a distal threaded portion (22) for screwing into a hole in the cranium (50), and a first drive head (16), characterized in that said screw (10) has a second drive head (14) separated by a frangible portion (18) from said first drive head (16), which frangible portion (18) breaks at a predetermined maximal torque, and said screw (10) is made of a material which will not show up on an X-ray or a magnetic resonance scan of the cranium (50).
Claim 2
Dependent Claim
91 words
A cranial screw (10) having a hollow shank (12) which has a distal threaded portion (22) for screwing into a hole in the cranium (50), and a first drive head (16), characterized in that said screw (10) has a second drive head (14) separated by a frangible portion (18) from said first drive head (16), which frangible portion (18) breaks at a predetermined maximal torque, and said screw (10) is made of a material which will not show up on an X-ray or a magnetic resonance scan of the cranium (50).
Claim 3
Dependent Claim
23 words
The screw of Claim 1 wherein said frangible portion (18) is made of a different material from the remainder of said screw (10).
Claim 4
Dependent Claim
15 words
The screw of Claim 1 wherein said threaded portion (22) includes a self-tapping thread (24).
Claim 5
Dependent Claim
15 words
The screw of Claim 1 wherein said distal tip (26) is chamfered for easy insertion.
Claim 6
Dependent Claim
14 words
The screw of Claim 1 wherein said lumen is slightly tapered to facilitate molding.
Claim 7
Dependent Claim
30 words
The screw of Claim 1 wherein said proximal portion (20) extends proximally from said insertion drive head (16) and is adapted for connection to equipment external to the cranium (50).
Claim 8
Dependent Claim
19 words
The screw of Claim 6 wherein said extending proximal portion (20) end includes a standard luer lock connection (32).
Claim 9
Dependent Claim
48 words
The screw of Claim 1 wherein the distal portion (22) of said emergency removal drive head (14) is formed into a circular flange (28); and, further including washer (30) to provide a tight seal between said flange (28) and the cranium (50) when said screw (10) is tightened.
Claim 10
Dependent Claim
31 words
The screw of Claim 1 wherein said distal portion (22) includes a first wall thickness and said frangible portion (18) includes a second wall thickness less than said first wall thickness.
References Cited (Backward Citations)
No citation records indexed.
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