EP0194014A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Surgical instruments
Assignee: DePuy International Ltd
•
Filing: 1986-01-27
•
Granted: —
•
Expires: 2006-01-27
Abstract
Abstract A set of surgical instruments for use in the implantation of a knee prosthesis include alignment rods (6, 35) inserted into the femur and tibia, two femoral saw guides 28 and 21 for resecting the femur, and a tibial saw guide 36 for resecting the tibia, a broach 45 and a reamer 42 for cutting recesses in the tibia, a femoral pusher for locating a femoral component of a knee prosthesis over the resected end of the femur, and a tibial impactor for tapping a tibial component home within the tibia.
Inventors
- 👤 Martin Arthur Elloy
- 👤 Robert Johnson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 19:28
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/14; A61B17/15; A61B17/154; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4603; A61F2/461; A61B17/155; A61B17/157; A61B17/16; A61B17/1659; A61B17/1662; A61B17/1675; A61F2002/4687
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
204 words
A set of instruments for use in the surgical implantation of a knee prosthesis, characterised in that the set includes a femoral alignment rod (6) one end of which is for insertion into the medulla of a femur (2) through an access hole (7) located between the femoral condyles (5), said end being sufficiently blunt and said rod being of sufficient flexibility that the rod will not penetrate the bone of the femur but rather bend to travel within the medulla, said rod being however of sufficient resilience to maintain its linearity within the femur as far as possible, said rod being of sufficient length to extend at least beyond the lesser trochanter with the other end of said rod protruding exteriorly from between the femoral condyles (5), the set of instruments further including an angle adaptor (16) having an elongate body portion (17) and also having means (19) to allow the adaptor to be slid over and rotated about the protruding alignment rod with the longitudinal axis of the body portion of the adaptor forming an acute angle with the longitudinal axis of the alignment rod , said angle adaptor also having means (20) rigidly to fix said angle adaptor to the femur.
Claim 2
Dependent Claim
204 words
A set of instruments for use in the surgical implantation of a knee prosthesis, characterised in that the set includes a femoral alignment rod (6) one end of which is for insertion into the medulla of a femur (2) through an access hole (7) located between the femoral condyles (5), said end being sufficiently blunt and said rod being of sufficient flexibility that the rod will not penetrate the bone of the femur but rather bend to travel within the medulla, said rod being however of sufficient resilience to maintain its linearity within the femur as far as possible, said rod being of sufficient length to extend at least beyond the lesser trochanter with the other end of said rod protruding exteriorly from between the femoral condyles (5), the set of instruments further including an angle adaptor (16) having an elongate body portion (17) and also having means (19) to allow the adaptor to be slid over and rotated about the protruding alignment rod with the longitudinal axis of the body portion of the adaptor forming an acute angle with the longitudinal axis of the alignment rod , said angle adaptor also having means (20) rigidly to fix said angle adaptor to the femur.
Claim 3
Dependent Claim
42 words
A set of instruments according to Claim 1, characterised in that the longitudinal axis of the body portion (17) of the angle adaptor (16) forms an angle of between 82° and 84° to the longitudinal axis of the femoral alignment rod (6).
Claim 4
Dependent Claim
41 words
A set of instruments according to Claim 1 or Claim 2 characterised in that the femoral alignment rod (6) is of a sufficient length to extend beyond the lesser trochanter of the femur whilst still protruding from the femoral condyles (5).
Claim 5
Dependent Claim
103 words
A set of surgical instruments according to any of the preceding claims characterised in that the set includes a first femoral saw guide (21) for resecting anterior and posterior portions of the distal end of the femur, the saw guide including means (24) to accommodate the body portion of the angle adaptor, a central slot (25) for slidably accommodating the protruding femoral alignment rod, a pair of upper slots (26) for guiding a saw to resect an anterior portion of the femur, and one or more pairs of lower slots (27) for guiding a saw to resect a posterior portion of the femur.
Claim 6
Dependent Claim
82 words
A set of instruments according to any of the preceding claims characterised in that the set includes a second femoral saw guide (28) for resecting an inferior portion of the distal end of the femur, the saw guide including means (30) to accommodate the body portion of the angle adaptor, a central slot (31) for slidably accommodating the protruding femoral alignment rod, and upper and lower pairs of slots (32) for guiding a saw to resect an inferior portion of the femur.
Claim 7
Dependent Claim
64 words
A set of instruments according to any of the preceding claims characterised in that the set includes a femoral pusher (55) having means (56) to push a femoral component of a knee prosthesis home onto the resected portion of the femur, said pushing means being inclined at an angle of between 82° to 84° to the longitudinal axis of the femoral alignment rod (6).
Claim 8
Dependent Claim
37 words
A femoral component of a knee prosthesis characterised in that it has an opening in its bearing surface through which a femoral alignment rod of a set of instruments as claimed in any of the preceding claims.
Claim 9
Dependent Claim
104 words
- A set of instruments according to any of the preceding claims characterised in that the set includes a tibial alignment rod (35) for insertion into the medulla of the tibia (1) through an access hole (34 )located in the proximal end of the tibia , the rod being of sufficient length so as, when fully inserted, to protrude from said end, and one or more cutting tools (45, 42) for cutting a recess into the tibia, said tool or tools being adapted to rotate about an axis which is parallel to but horizontally displaced from the longitudinal axis of the tibial alignment rod.
Claim 10
Dependent Claim
73 words
A set of instruments according to any of the preceding claims characterised in that the tool or tools includes a mandrel (42a) having an eccentric bore (43) for engaging the tibial alignment rod (35) and having an outer cylindrical surface with a longitudinal axis parallel to but horizontally displaced from the axis of the tibial alignment rod (35), said tool or tools being arranged for rotation about the cylindrical surface of said mandrel.
Claim 11
Dependent Claim
48 words
A set of instruments according to any of the preceding claims characterised in that the tool or tools comprise a reamer (42) for cutting out a surface of revolution in the proximal end to the tibia, and a broach (45) for cutting an axial socket in the tibia.
Claim 12
Dependent Claim
43 words
ll. A set of instruments according to any of the preceding claims characterised in that the tibial alignment rod is of a sufficient length so as to extend close to the ankle joint whilst still protruding from the proximal end of the tibia.
Claim 13
Dependent Claim
73 words
A set of instruments according to any of the preceding claims characterised in that the set includes a tibial saw guide (36) for cutting a tibial plateau on the proximal end of the tibia, the saw guide comprising means (38) to slidably and rotatably accommodate the protruding tibial alignment rod, and a pair of slots (41) to guide a saw to cut a complete tibia plateau on the proximal end of the tibia.
Claim 14
Dependent Claim
48 words
A set of instruments according to any of the preceding claims characterised in that the slots (41) in the tibial saw guide are adjustable in position relative to the tibial alignment rod (35) so as to allow the guide to be rotated about the whole of the tibia.
Claim 15
Dependent Claim
45 words
A set of instruments according to any of the preceding claims characterised in that a constraining member which is in the form of a bifurcated pin for insertion through the tibia to engage a portion of the reamer to prevent excess reaming of the tibia.
Claim 16
Dependent Claim
49 words
A set of instruments according to any of the preceding claims characterised in that the set includes a tibial impactor (52) for pushing a tibial component of a knee prosthesis home within the axial socket, the impactor having an eccentric bore (53) therein to accommodate the tibial alignment rod.
Claim 17
Dependent Claim
35 words
A tibial component of a knee prosthesis characterised in that it has an eccentric bore therein to accommodate a tibial alignment rod of a set of instruments as claimed in any of the preceding claims.
Claim 18
Dependent Claim
62 words
A set of instruments according to any of the preceding claims characterised in that the set includes an alignment rod introducer (10) having means (13) to grip an end of the alignment rod to allow the rod to be inserted into tibial or femoral medulla and thereafter to release the alignment rod when it is in the correct position in the medulla.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.