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EP0023787A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Plugs for the medullary canal of a bone

Assignee: University of Exeter
•
Filing: 1980-07-18
•
Granted: —
•
Expires: 2000-07-18
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Abstract

Abstract An implant 22, e.g. for locating a hip prosthesis, is placed in the medullary canal 18 of a bone 20 (e.g. the femur) and secured by pressurised cement 24. A push-fit plug 10 prevents cement penetrating down the canal. The plug. can be biodegradable so that in time it dissolves away and does not modify the flexural rigidity of the cement/ bone system and the risk of fractures occurring at the level of the plug is reduced. Additionally or alternatively, the outwardly facing end portion 16 of the plug may be generally conical so that the thickness of the cement increases gradually and the flexural rigidity likewise changes gradually.

Inventors

  • 👤 Alan John Clive Lee
  • 👤 Robin Sidney Mackwood Ling

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-25 14:07
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/22; A61L27/225; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30723; A61L27/50; A61L27/58; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30062; A61F2002/30316; A61F2002/30535; A61F2002/30593; A61F2002/30594; A61F2/46; A61F2002/4631; A61F2210/00; A61F2210/0004; A61F2310/00; A61F2310/00005; A61F2310/00365; A61F2310/00377; A61L2430/00; A61L2430/02

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 39 words
- A plug for the medullary canal of a boner having a portion (12) with sides (14) adapted to be a push fit in the medullary canal (18), characterised in that the plug is made of a biodegradable material.
Claim 2
Dependent Claim 39 words
- A plug for the medullary canal of a boner having a portion (12) with sides (14) adapted to be a push fit in the medullary canal (18), characterised in that the plug is made of a biodegradable material.
Claim 3
Dependent Claim 12 words
A plug according to claim 1 having a tapering end portion (16).
Claim 4
Dependent Claim 16 words
A plug according to claim 1 or claim 2 wherein the biodegradable material comprises ox fibrin.
Claim 5
Dependent Claim 15 words
A plug according to claim 3 wherein the biodegradable material contains glycerol as a plasticizer.
Claim 6
Dependent Claim 35 words
A plug for the medullary canal of a bone, comprising a portion (12;30) having sides (14;32) adapted to be a push fit in the medullary canal (18), and characterised by a tapering end portion (16;28).
Claim 7
Dependent Claim 35 words
A plug for the medullary canal of a bone, comprising a portion (12;30) having sides (14;32) adapted to be a push fit in the medullary canal (18), and characterised by a tapering end portion (16;28).
Claim 8
Dependent Claim 10 words
A plug according to claim 5 made from plastics material.
Claim 9
Dependent Claim 28 words
A plug according to claim 5 or claim 6 wherein the portion (30) which has sides adapted to be a push fit in the canal is hollow (34).
Claim 10
Dependent Claim 35 words
A plug according to claim 7 wherein the hollow portion (30) has one or more slits (36) in a longitudinal plane which permit flexing of said sides (32) to facilitate insertion in the canal (18).
Claim 11
Dependent Claim 23 words
A plug according to claim 2 or any one of claims 5 to 8 wherein the tapering end portion (16;28) is generally conical.

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