Patent EP0543099A2 successfully refreshed from Google Patents.
EP0543099A2
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Implant fixation stem
Assignee: Bristol Myers Squibb Co
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Filing: 1992-09-05
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Granted: —
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Expires: 2012-09-05
Abstract
Abstract An implant fixation stem (2) has a distal portion with a controlled stiffness. In one embodiment the deflection in response to a given force is equal to other similarly designed stems to give a surgeon consistent implantation feedback regardless of implant size. The deflection is preferably provided via a slot (3) in the stem (2), the slot (3) length being determined as a function of the stem's moment of inertia. Alternate embodiments provide for flutes (11,12) of unequal length.
Inventors
- 👤 Nisra Thongpreda
- 👤 Roy Y. Hori
- 👤 Richard F. Kyle
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 13:22
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/3676; A61F2/30767; A61F2/367; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30014; A61F2002/30316; A61F2002/30317; A61F2002/30319; A61F2002/30324; A61F2002/30326; A61F2002/30535; A61F2002/30579; A61F2002/30594; A61F2002/30604; A61F2002/30616; A61F2/30771; A61F2002/3082; A61F2002/30827; A61F2/3609; A61F2002/3625; A61F2002/3627; A61F2002/3631; A61F2002/365; A61F2250/00; A61F2250/0014; A61F2250/0018; A61F2250/0036; A61F2250/0037
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
35 words
A system of stemmed implants, wherein each implant has a portion of its stem that exhibits a predetermined deflection in response to a predetermined force that is substantially equal to that of the other implants.
Claim 2
Dependent Claim
16 words
The system of claim 1 wherein each implant stem has a distal portion containing a slot.
Claim 3
Dependent Claim
15 words
The system of claim 2 wherein the slot is internally chamfered at its distal end.
Claim 4
Dependent Claim
15 words
The system of claim 3 wherein the slot is externally chamfered at its distal end.
Claim 5
Dependent Claim
14 words
The system of claim 4 wherein the slot is cut in the medial-lateral plane.
Claim 6
Dependent Claim
33 words
The system of claim 4 wherein the internal chamfer length is approximately equal to one-half the length of the slot and the external chamfer length is no greater than the internal chamfer length.
Claim 7
Dependent Claim
60 words
A femoral hip implant comprising a stem having an end defining a neck and an opposite rounded end, the rounded end containing a slot defining two sides, one side of the slot further being externally chamfered, the other side of the slot being internally chamfered such that the internal chamfer length is at least as long the external chamfer length.
Claim 8
Dependent Claim
14 words
The implant of claim 7 wherein the slot is cut in the medial-lateral plane.
Claim 9
Dependent Claim
73 words
A hip implant for insertion into a femur, the implant having aspects associated with the medial, lateral, anterior and posterior portions or the femur; the implant comprising a stem having a proximal end defining a neck and an opposite distal end; the stem portion adjacent the distal end containing medial, lateral, anterior and posterior flutes which extend proximally; the medial and lateral flute lengths being shorter than the anterior and posterior flute lengths.
References Cited (Backward Citations)
No citation records indexed.
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