EP0149527A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fixation of implants in bone
Assignee: University of Exeter
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Filing: 1985-01-10
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Granted: —
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Expires: 2005-01-10
Abstract
Abstract A bone implant assembly having an implant element whereof a stem portion 1 is for insertion into a bone cavity 6, and wedge means 2, 3 for wedging between a proximal region of the cavity wall and the stem 1. The stem is tapered so that deeper insertion urges the wedge means 2, against the wall. The wedge means may comprise lateral (3) and imedia! (2) wedges. Each may comprise a stem engaging portion 9, 10 with a low-friction surface, and an outer, wall engaging portion 7, 8 having a surface adapted for non-slip engagement, being a high friction surface and/or adapted for ingrowth of bone.
Inventors
- 👤 Alan John Clive Lee
- 👤 Robin Sidney Mackwood Ling
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 11:48
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30734; A61F2/30724; A61F2/30767; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/3676; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30153; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0019
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
Bone implant assembly comprising a bone implant element having a stem portion (1;11) for insertion into a bone cavity (6), characterised in that it further includes wedge means (2,3;7-10;13,14;18,19) adapted to engage with respective surfaces both the wall of the cavity (6) and the stem portion (1;11), so as to permit relative displacement of the stem portion (1;11).
Claim 2
Dependent Claim
58 words
Bone implant assembly comprising a bone implant element having a stem portion (1;11) for insertion into a bone cavity (6), characterised in that it further includes wedge means (2,3;7-10;13,14;18,19) adapted to engage with respective surfaces both the wall of the cavity (6) and the stem portion (1;11), so as to permit relative displacement of the stem portion (1;11).
Claim 3
Dependent Claim
34 words
Bone implant assembly according to claim 1 wherein the stem portion (1;11) is tapered to cooperate with the wedge means (2,3;7-10;13,14;18,19) so that its displacement can urge the wedge means against the cavity wall.
Claim 4
Dependent Claim
27 words
Bone implant assembly according to claim 1 or 2 wherein the wedge means has a portion of low-friction, low-wear material (9,10) which provides the stem engaging surface.
Claim 5
Dependent Claim
27 words
Bone implant assembly according to any preceding claim wherein the wedge means (2,3;7-10;13,14;18,19) has a wall engaging surface which is adapted for non-slipping contact with the wall.
Claim 6
Dependent Claim
34 words
Bone implant assembly according to any preceding claim wherein the wedge means comprise two wedge like devices (2,3;7,9 and 8,10), for engaging the lateral (3;8,10) and medial (2;7,9) sides of the stem (1;11) respectively.
Claim 7
Dependent Claim
37 words
Bone implant assembly according to claim 5 wherein the medial wedge like device (2) has lip means (4) for engaging the bone around the mouth of the cavity to prevent it from moving distally down the cavity.
Claim 8
Dependent Claim
23 words
Bone implant assembly according to claim 5 or 6 wherein the wedge means include separate anterior (18) and posterior (19) wedge like devices.
Claim 9
Dependent Claim
51 words
Bone implant assembly according to any preceding claim wherein the wedge means comprise at least one wedge like device which comprises a component (9,10) of a low friction material which provides the stem engaging surface; and an outer portion (7,8) of implant grade metal of the same composition as the stem.
Claim 10
Dependent Claim
30 words
Bone implant assembly according to any preceding claim wherein the wedge means comprises a wedge like device (13,14) which is elongate and has transverse slots (15) whereby it is deformable.
Claim 11
Dependent Claim
24 words
Bone implant assembly according to any preceding claim wherein the wedge means are of adjustable thickness so as to be adaptable to different cavities.
References Cited (Backward Citations)
No citation records indexed.
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