EP0451932A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Bone screw
Assignee: Johnson and Johnson Professional Products GmbH
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Filing: 1991-04-10
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Granted: —
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Expires: 2011-04-10
Abstract
Abstract Bone screw (1) formed of a material which is resorbable by the body comprising a recess (5) for the introduction of an insertion tool (8) whose cross-section is non-circular and suited for the transferral of torque, characterised in that the recess (5) for the introduction of the insertion tool (8) is situated in the head (4) of the bone screw (1) and that from the recess (5) there extends a through-going bore (6) for the insertion of a guide pin (9) to the tip (7) of the bone screw (1) and that the bore (6) comprises a round cross-section smaller than the cross-section of the recess (5).
Inventors
- 👤 Hans-Joachim Dr.-Ing. Fischer
- 👤 Curt Dr.-Ing. Kranz
- 👤 Günther Dr.-Ing. Sauer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 02:44
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/864; A61B17/866; A61B17/88; A61B17/8875; A61B17/8605; A61B17/861; A61B2017/00004
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
Bone screw formed of a material resorbable by the body and which comprises a recess for the introduction of an insertion tool whose cross-section is non-circular and is suited for the transferral of torque, characterised in that the recess (5) for the introduction of the insertion tool (8) is situated in the head (4) of the bone screw (1) and the bone screw (1) comprises a through-going bore (6) for the insertion of a guide pin (9) which extends from the recess (5) to the tip (7) of the bone screw (1) and whereby the through-going bore (6) comprises a round, cross-section smaller than the cross-section of the recess (5).
Claim 2
Dependent Claim
20 words
Bone screw according to claim 1, characterised in that the recess (5) is formed in the shape of a cross.
Claim 3
Dependent Claim
34 words
Bone screw according to claim 2, characterised in that the diameter of the through-going bore (6) is essentially equivalent to the length of the diagonal of the central area of said cross-shaped recess (5).
Claim 4
Dependent Claim
36 words
Bone screw according to any one of the preceding claims, characterised in that the mean size of the wall cross-section is essentially constant in the shaft (2) and head (4) region of the bone screw (1).
Claim 5
Dependent Claim
74 words
Bone screw according to any one of the preceding claims, characterised in that the shortest distance from a surface area (10) of the bone screw (1) which is in contact with body fluids to a surface area (11) of the bone screw (1) which is not in contact with body fluids is approximately the same or corresponds to half the distance to another surface area (10) which is also in contact with body fluids.
References Cited (Backward Citations)
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