Patent US2916806A successfully refreshed from Google Patents.
EP0145938B1
Expired / Lapsed
EP
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Intramedullary prosthesis
Assignee: Protek AG
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Filing: 1984-11-08
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Granted: 1988-05-18
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Expires: 2004-11-08
Abstract
Abstract 1. Prosthesis stem for cement-free anchorage of an endo-prosthesis into a tubular bone with an anterior, a posterior, a medial and a lateral stem surface, the distal end (9) of said stem being split into a lateral (14) and a medial (15) leg by a slit (13) of the length L running from the distal to the proximal side and from the anterior to the posterior side, characterized in that said slit (13) is displaced medially with regard to the center axis (2) of the distal half of said stem by such an amount that said medial leg (15) is plastically and elastically deformable and said lateral leg (14) is essentially rigid.
Inventors
- 👤 Dan Dr. Weill
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 14:27
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/3676; A61F2/46; A61F2/4603; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30594
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
Prosthesis stem for cement-free anchorage of an endo-prosthesis into a tubular bone with an anterior, a posterior, a medial and a lateral stem surface, the distal end (9) of said stem being split into a lateral (14) and a medial (15) leg by a slit (13) of the length L running from the distal to the proximal side and from the anterior to the posterior side, characterized in that said slit (13) is displaced medially with regard to the center axis (2) of the distal half of said stem by such an amount that said medial leg (15) is plastically and elastically deformable and said lateral leg (14) is essentially rigid.
Claim 2
Dependent Claim
111 words
Prosthesis stem for cement-free anchorage of an endo-prosthesis into a tubular bone with an anterior, a posterior, a medial and a lateral stem surface, the distal end (9) of said stem being split into a lateral (14) and a medial (15) leg by a slit (13) of the length L running from the distal to the proximal side and from the anterior to the posterior side, characterized in that said slit (13) is displaced medially with regard to the center axis (2) of the distal half of said stem by such an amount that said medial leg (15) is plastically and elastically deformable and said lateral leg (14) is essentially rigid.
Claim 3
Dependent Claim
23 words
Prosthesis stem according to claim 1, characterized in that said medial leg (15) has a lower bending strength than said lateral leg (14).
Claim 4
Dependent Claim
53 words
Prosthesis stem according to claim 1 or 2, characterized in that the ratio that the width A of said medial leg (15) measured in medio-lateral direction bears to said length L of said slit (13) is between 1 : 4 and 1 : 10, preferably between 1 : 4.5 and 1 : 5.5.
Claim 5
Dependent Claim
21 words
Prosthesis stem according to one of the claims 1 to 3, characterized in that it is designed as a straight stem.
Claim 6
Dependent Claim
45 words
Prosthesis stem according to one of the claims 1 to 4, characterized in that it widens at least in the distal half of its stem hight measured along the center axis (2) from distal to proximal at least on one side of said axis (2).
Claim 7
Dependent Claim
25 words
Prosthesis stem according to one of the claims 1 to 5, characterized in that said anterior and posterior stem surfaces are parallel to each other.
Claim 8
Dependent Claim
24 words
Prosthesis stem according to one of the claims 1 to 6, characterized in that said slit (13) is parallel to said center axis (2).
References Cited (Backward Citations)
No citation records indexed.
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