EP0519873B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Joint prosthesis, particularly for the knee
Assignee: Individual
•
Filing: 1992-06-16
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Granted: 1996-12-27
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Expires: 2012-06-16
Abstract
Abstract The joint prosthesis comprises a first prosthetic part (11), an intermediate part (13), a coupling member (15) and a second prosthetic part (17). The first prosthetic part comprises means for anchorage in the bone, e.g. in the femur, and two condyles (19). These condyles (19) articulate with the bearing surfaces (21) of the intermediate part (13). The second prosthetic part (17) possesses a sliding surface (24) and means (25, 27) for anchorage in the bone, e.g., in the tibia. A bore (31) receives a pivot (33) of the coupling member (15). The coupling member (15) possesses a guide part (16) which cooperates with the guide track (35). The movement sequence of the joint prosthesis corresponds largely to the physiological movement sequence of the natural joint. The condyles (19) and the bearing surfaces (21) are used for the articulation movement. The translation movement, e.g. from anterior to posterior, is brought about by the displacement of the intermediate part (13) on the sliding surface (24) due to the coupling member. The pivot (33) permits rotation about the axis (39). <IMAGE>
Inventors
- 👤 André Bähler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 22:50
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3886; A61F2/3868; A61F2/3877; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30383; A61F2002/30387; A61F2002/3039; A61F2002/30398; A61F2002/3881; A61F2220/00; A61F2220/0025
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
191 words
A joint prosthesis, more particularly a knee-joint prosthesis, comprising at least one first prosthesis part (11) comprising an anchoring portion and at least one rotary joint portion (19), a second prosthesis part (17) comprising at least one anchoring portion (25, 27) and one slicing surface (24), an intermediate part (13) pivotable round a pivot (33) and comprising at least one rotary joint portion (21) for co-operating with the corresponding rotary joint portion (19) of the first prosthesis part (11) and adapted to move in translation and also to pivot relative to the first prosthesis part (17), and a coupling means (15) disposed between the second prosthesis part (17) and the intermediate part (13) and the intermediate part (13) and the coupling means (15) co-operate via a guide part (16) and a guide track (35), not slot-shaped, which receives the guide part and in which the guide part can slide with medial and lateral guidance, and either the guide part (16) or the guide track (35) is disposed on the coupling means (15) and the corresponding counterpart, i.e. the guide track or the guide part, is formed on the intermediate part (13).
Claim 2
Dependent Claim
30 words
A joint prosthesis according to claim 1, characterised in that the pivot (33) is disposed on the coupling means (15) and is pivotably mounted in the second prosthesis part (17).
Claim 3
Dependent Claim
26 words
A joint prosthesis according to claim 2, characterised in that the pivot (33) is mounted in a bore (31) which extends in an anchoring portion (25).
Claim 4
Dependent Claim
34 words
A joint prosthesis according to claim 1, characterised in that the pivot (33') is disposed on the second prosthesis part (17), and the coupling means (15) is mounted for pivoting on the pivot (33').
Claim 5
Dependent Claim
33 words
A joint prosthesis according to claim 1, characterised in that the pivot (33) is disposed on the coupling means (15), and the intermediate part (13) is mounted for pivoting on the pivot (33).
Claim 6
Dependent Claim
33 words
A joint prosthesis according to claim 1, characterised in that the pivot (33) is mounted on the second prosthesis part (17), and the intermediate part (13) is mounted for pivoting on the pivot.
Claim 7
Dependent Claim
24 words
A joint prosthesis according to any of claims 1 to 6, characterised in that the guide track (35) is disposed in the sagittal direction.
Claim 8
Dependent Claim
20 words
A joint prosthesis according to claim 7, characterised in that the respective guide track (35) extends in a straight line.
Claim 9
Dependent Claim
24 words
A joint prosthesis according to claim 7, characterised in that the guide track (35) extends in an arc with a medial radius of curvature.
Claim 10
Dependent Claim
31 words
A joint prosthesis according to any of claims 1 to 9, characterised in that the second part (17) has a sliding surface (24) on which the intermediate part (13) is mounted.
Claim 11
Dependent Claim
34 words
A joint prosthesis according to any of claims 1 to 10, characterised in that means (34, 34') are provided for preventing the intermediate part (13) from being lifted off the second prosthesis part (17).
Claim 12
Dependent Claim
36 words
A joint prosthesis according to any of claims 1 to 11, characterised in that the mobility of the intermediate part (13) relative to the coupling means (15) is restricted to motion along the guide track (35).
Claim 13
Dependent Claim
41 words
A joint prosthesis according to any of claims 1 to 12, characterised in that the guide track (35) and the guide part (16) are in the form of a groove and web, a dovetail, a roof or an arcuate enveloping part.
Claim 14
Dependent Claim
27 words
A joint prosthesis according to any of claims 1 to 13, characterised in that the guide track (35) is disposed practically centrally in the intermediate part (13).
Claim 15
Dependent Claim
59 words
A joint prosthesis according to any of claims 1 to 14, characterised in that the rotary joint portion of the first prosthesis part is formed by two condyles (19) and that the rotary joint portion of the intermediate part is formed by two corresponding bearing surfaces (21) for co-operating with the condyles (19) of the first prosthesis part (11).
Claim 16
Dependent Claim
55 words
A joint prosthesis according to any of claims 1 to 15, characterised in that the rotary joint portion of the first prosthesis part (11) is formed by two condyles (19) and that an intermediate part (13) having a bearing surface (21) and common to both condyles (19) is provided for each of the condyles (19).
Claim 17
Dependent Claim
23 words
A joint prosthesis according to claim 16, characterised in that the common intermediate part (13) is guided by two spaced-apart guide tracks (16).
Claim 18
Dependent Claim
60 words
A joint prosthesis according to any of claims 1 to 15, characterised in that the rotary joint portion of the first prosthesis part (11) is formed by a condyle (19) and that the rotary joint portion of the intermediate part (13) is formed by a bearing surface (21) for co-operating with the condyle (19) of the first prosthesis part (11).
Claim 19
Dependent Claim
39 words
A joint prosthesis according to any of claims 1 to 18, characterised in that the condyle (19) on the first prosthesis part (11) is convex and the associated bearing surface (21) on the intermediate part (13) is correspondingly concave.
Claim 20
Dependent Claim
39 words
A joint prosthesis according to any of claims 1 to 18, characterised in that the condyle (19) on the first prosthesis part (11) is concave and the corresponding bearing surface (21) on the intermediate part (13) is correspondingly convex.
Claim 21
Dependent Claim
39 words
A joint prosthesis according to any of claims 1 to 20, characterised in that the bearing surface (21) of the intermediate part (13) is formed by an interchangeable bearing element (13') in a recess (45) in the intermediate part.
Claim 22
Dependent Claim
18 words
A joint prosthesis according to claim 21, characterised in that the recess (45) extends all the way through.
Claim 23
Dependent Claim
20 words
A joint prosthesis according to claim 21, characterised in that the recess (45) does not extend all the way through.
Claim 24
Dependent Claim
30 words
A joint prosthesis according to any of claims 1 to 23, characterised in that the intermediate part (13) is mounted so as to be movable on the sliding surface (24).
Claim 25
Dependent Claim
34 words
A joint prosthesis according to any of claims 1 to 23, characterised in that the intermediate part (13) is held e.g. by the coupling means (15) at a distance from the sliding surface (24).
Claim 26
Dependent Claim
35 words
A joint prosthesis according to any of claims 1 to 25, characterised in that the second part (17) and the intermediate part (13) have a recess (29, 37) for the front and/or rear cruciate ligament.
Claim 27
Dependent Claim
46 words
A joint prosthesis according to claim 1 or 2, characterised in that the coupling means (15) has a stabilising element (36) which co-operates with a stabilising means (14) on the first prosthesis part (11) in order to ensure stability even with absent or weak ligament structures.
Claim 28
Dependent Claim
23 words
A joint prosthesis according to claim 27, characterised in that the rotary joint portion (19) of the first prosthesis part (11) is cylindrical.
Claim 29
Dependent Claim
29 words
A joint prosthesis according to claim 27, characterised in that the rotary joint portion (19) of the first prosthesis part (11) is curved in spherical manner over both condyles.
Claim 30
Dependent Claim
28 words
A joint prosthesis according to claim 27, characterised in that the rotary joint portion (19) of the first prosthesis part (11) has two condyle-like spherically curved surfaces (19).
Claim 31
Dependent Claim
23 words
A joint prosthesis according to any of claims 27 to 30, characterised in that the first prosthesis part (11) is in one piece.
Claim 32
Dependent Claim
27 words
A joint prosthesis according to any of claims 27 to 30, characterised in that the stabilising means (14) is a part mounted on a base part (12).
Claim 33
Dependent Claim
34 words
A joint prosthesis according to any of claims 27 to 32, characterised in that the second prosthesis part (17) and the intermediate part (13) have a recess (29, 37) for the rear cruciate ligament.
Claim 34
Dependent Claim
47 words
A joint prosthesis according to any of claims 1 to 33, characterised in that the connection of the intermediate part (13) to the coupling means (15) is such that the coupling means together with the intermediate part (13) is pivoted relative to the second prosthesis part (17).
References Cited (Backward Citations)
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