EP0359485A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Modular prosthesis
Assignee: MTG Divestitures LLC
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Filing: 1989-09-08
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Granted: —
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Expires: 2009-09-08
Abstract
Abstract A modular prosthesis 10 features at least one male-female fitting 30, with the female portion 36 being located on one end of one segment 16 of that prosthesis and the mating male portion 34 being located on one end of a second prosthesis segment 18, with at least the proximal part of the male-female fitting 30 having a taper 42, 44. Such a modular prosthesis 10 is especially useful for use as a femoral hip prosthesis having a modulus of elasticity compatible to the modulus of elasticity of bone and having a very close fit to the femoral canal 11 of the patient being treated. The two parts 34, 36 of that fitting 30 can be locked together by a locking mechanism in the form of a novel spacer 24 which also has a taper 56 which mates with the taper 42, 44 of the male-female fitting 30 described above. Multiple modular segments 16, 18, 20 can be assembled together so as to produce a prosthesis as required by the patient.
Inventors
- 👤 Robert V. Kenna
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 05:45
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/3672; A61F2/30721; A61F2/30724; A61F2/367; A61F2/3676; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30014; A61F2002/30316; A61F2002/30329; A61F2002/30383; A61F2002/30426; A61F2002/30476; A61F2002/3049; A61F2002/30535; A61F2002/30537; A61F2002/3055; A61F2002/30599; A61F2002/30604; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2220/00; A61F2220/0025; A61F2250/00; A61F2250/0014; A61F2250/0018; A61F2250/0058; A61F2250/006; A61F2250/0063
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
57 words
A modular prosthesis 10 comprising two stem segments 16, 18, a proximal portion A 16 and a second portion B 18, said portion A 16 being able to be joined to said portion B 18 at point X by a first fitting 30 having a locking mechanism which is held in place by a first spacer 24.
Claim 2
Dependent Claim
57 words
A modular prosthesis 10 comprising two stem segments 16, 18, a proximal portion A 16 and a second portion B 18, said portion A 16 being able to be joined to said portion B 18 at point X by a first fitting 30 having a locking mechanism which is held in place by a first spacer 24.
Claim 3
Dependent Claim
59 words
A device according to claim 1, wherein said prosthesis 10 is a modular femoral hip prosthesis 10 and wherein said first fitting 30 having a locking mechanism comprises a male-female fitting 30 joining the distal end of proximal portion A 16 with the proximal end of second portion B 18 so as to produce a first tapered stem region.
Claim 4
Dependent Claim
48 words
A device according to claim 2 and including also a third portion C 20 which is able to be joined at point Y to said second portion B 18 by a second fitting 32 having a locking mechanism which is held in place by a second spacer 26.
Claim 5
Dependent Claim
46 words
A device according to claim 3, wherein said second fitting 32 comprises a male-female fitting 32 and wherein the distal end of said portion B 18 is joined to the proximal end of third portion C 20 so as to produce a second tapered stem region.
Claim 6
Dependent Claim
28 words
A device according to claim 4, wherein said first spacer 24 has an inner diameter which is tapered so as to mate with said first tapered stem region.
Claim 7
Dependent Claim
22 words
A device according to claim 5, wherein said second spacer 26 has a taper which mates with said second tapered stem region.
Claim 8
Dependent Claim
51 words
A device according to claim 6, and including also a first locking mechanism which comprises a first inwardly directed key 58 located on the inside of and near the proximal end of said first spacer 24 and which can pass along a first groove 46 located within said first fitting 30.
Claim 9
Dependent Claim
30 words
A device according to claim 7, wherein the distal end of said first groove 46 is spaced apart from said first male-female fitting 30 by an angle of about 90°.
Claim 10
Dependent Claim
46 words
A device according to claim 6, and including also a second locking mechanism which comprises a second key 58 which is located near the proximal end of said second spacer 26 and which can pass along a second groove 46 located within said second fitting 32.
Claim 11
Dependent Claim
30 words
A device according to claim 9, wherein said distal end of said second groove 46 is spaced apart from said second male-female fitting 32 by an angle of about 90°.
Claim 12
Dependent Claim
24 words
A device according to claim 10 and including also a third spacer 28 which is located at the distal end of portion C 20.
Claim 13
Dependent Claim
28 words
A device according to claim 11, wherein said third spacer 28 has a taper which mates with the taper of the distal end of said portion C 20.
Claim 14
Dependent Claim
26 words
A device according to claim 3, and including also a third spacer 28 which is positioned at the distal end of said third portion C 20.
Claim 15
Dependent Claim
54 words
A hip prosthesis 10 comprising a first stem portion 16 and a second stem portion 18, said first stem portion 16 and said second stem portion 18 each having a tapered end portion and said first stem portion 16 and said second stem portion 18 being joinable together by means of a dovetail connection.
Claim 16
Dependent Claim
54 words
A hip prosthesis 10 comprising a first stem portion 16 and a second stem portion 18, said first stem portion 16 and said second stem portion 18 each having a tapered end portion and said first stem portion 16 and said second stem portion 18 being joinable together by means of a dovetail connection.
Claim 17
Dependent Claim
34 words
A device according to claim 14, wherein said first stem portion 16 and said second stem portion 18 are lockable together by means of a spacer fitting 24 which has an inner tapered portion.
Claim 18
Dependent Claim
50 words
A device according to claim 15, wherein said spacer fitting 24 has a key 58 which mates into a groove 46 located in the tapered portion of said first stem portion 16 and which can be passed therethrough so as to lock said first fitting 30 within said spacer 24.
Claim 19
Dependent Claim
93 words
A spacer 24 having a tapered inner diameter, wherein said tapered inner diameter mates with the tapered portion of a fitting 30 which joins a first stem portion 16 and a second portion 18 of a prosthesis 10, said spacer 24 having a key 58 which extends inwardly from the inner surface 24 of said spacer and which is adapted to fit within a groove 46 located within the distal end of said first portion 16 so as to lock said first portion 16 to a second portion 18 of said prosthesis 10.
Claim 20
Dependent Claim
93 words
A spacer 24 having a tapered inner diameter, wherein said tapered inner diameter mates with the tapered portion of a fitting 30 which joins a first stem portion 16 and a second portion 18 of a prosthesis 10, said spacer 24 having a key 58 which extends inwardly from the inner surface 24 of said spacer and which is adapted to fit within a groove 46 located within the distal end of said first portion 16 so as to lock said first portion 16 to a second portion 18 of said prosthesis 10.
Claim 21
Independent Claim
167 words
A method of producing a modular femoral hip prosthesis 10 to be implanted into an intramedullary femoral canal 11, said method comprising (1) reaming said intramedullary canal 11 with a reamer which has a largest diameter d; (2) selecting from a supply of right and left hip prosthesis proximal portions a proximal portion 16 as desired, wherein said proximal portion has a first locking portion with a tapered portion and a largest diameter d; (c) selecting a first stem portion 18 having a proximal end which has a second locking portion with a tapered portion and largest diameter d and a distal end which has a third locking portion 36 which has a tapered portion and a largest diameter d′, wherein d is greater than d′; (d) selecting a first spacer 24 having a largest inner diameter d; (e) assembling together said first locking portion and said second locking portion; and (f) placing said first spacer 24 onto said first locking portion and said second locking portion.
Claim 22
Independent Claim
167 words
A method of producing a modular femoral hip prosthesis 10 to be implanted into an intramedullary femoral canal 11, said method comprising (1) reaming said intramedullary canal 11 with a reamer which has a largest diameter d; (2) selecting from a supply of right and left hip prosthesis proximal portions a proximal portion 16 as desired, wherein said proximal portion has a first locking portion with a tapered portion and a largest diameter d; (c) selecting a first stem portion 18 having a proximal end which has a second locking portion with a tapered portion and largest diameter d and a distal end which has a third locking portion 36 which has a tapered portion and a largest diameter d′, wherein d is greater than d′; (d) selecting a first spacer 24 having a largest inner diameter d; (e) assembling together said first locking portion and said second locking portion; and (f) placing said first spacer 24 onto said first locking portion and said second locking portion.
Claim 23
Dependent Claim
119 words
A method according to claim 18, and including also the steps of (g) adding a second stem portion 20 of a femoral hip prosthesis 10 at the distal end of said first stem portion, wherein said second stem portion 20 has a proximal end which has a fourth locking portion 34 with a tapered portion and a largest diameter d′ and a distal end which has a fifth locking portion 38 with a tapered portion and a largest diameter d˝ and then (h) placing a second spacer 26 onto said third locking portion and said fourth locking portion, wherein said second spacer 26 has a tapered portion and a largest inner diameter d′, wherein d′ is greater than d˝.
Claim 24
Dependent Claim
55 words
A method according to claim 19, and including also the step of (i) placing a third spacer 28 onto the distal portion of said second stem portion 20, wherein said third spacer 28 has a largest inner diameter d˝ and a tapered portion which mates with the distal end of said second stem portion 20.
References Cited (Backward Citations)
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