Modular guide for shaping of femur to accommodate intercondylar stabilizing housing and patellar track of implant
First Claim
1. Surgical instrumentation comprising, in combination:
- (a) a first bracket defining a generally U-shaped structure having an internal surface adapted to be seated on the distal aspect of a resected femur bone and an elongated central opening appointed to expose a selected area of the resected femur, including a curved track for guiding a first shaping tool along a predetermined path for controlled shaping of a curved patellar groove in a first trochlear portion of the selected area exposed through the opening;
(b) a second bracket including a base presenting a proximally-facing contact surface and means for supporting the base in releasable engagement with the track, including a bore extending through the base in a longitudinal direction generally parallel to the long axis of the femur for guiding a second shaping tool in forming a relatively deep recess in a second portion of the selected area exposed through the opening for accommodating an intercondylar stabilized housing of a knee implant in the femur; and
(c) means for accurately aligning the bore relative to the opening whole forming the recess.
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0 Petitions
Accused Products
Abstract
Modular surgical instrumentation and a method of using same is provided, according to the invention. The instrumentation comprises a first bracket defining a generally U-shaped structure having an internal surface adapted to be seated on the distal aspect of a resected femur bone and an elongated central opening appointed to expose a selected area of the resected femur, including a curved track for guiding a first shaping tool along a predetermined path for controlled shaping of a curved patellar groove in a portion of the selected area exposed through the opening. A second bracket defines a linear slotted bore extending generally parallel to the long axis of the femur for guiding a second shaping tool to form a relatively deep recess accommodating an intercondylar stabilizing housing of a knee implant. The second bracket has an internal surface defining a shape adapted for releasable engagement with the curved track, including mechanism for accurately aligning the slotted bore relative to the opening while forming the recess. The method of the invention comprises the steps of seating the first bracket described above on the distal aspect of the resected femur and moving the first shaping tool along the curved track to form a patellar groove in a selected area thereof. The first shaping tool is then withdrawn and, leaving the first bracket in place, the second bracket described above is seated on the curved track so that the slotted bore of the second bracket is accurately aligned with the opening of the first bracket, after which a second shaping tool is introduced through the bore to form a recess accommodating the intercondylar-stabilizing housing of the implant.
520 Citations
11 Claims
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1. Surgical instrumentation comprising, in combination:
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(a) a first bracket defining a generally U-shaped structure having an internal surface adapted to be seated on the distal aspect of a resected femur bone and an elongated central opening appointed to expose a selected area of the resected femur, including a curved track for guiding a first shaping tool along a predetermined path for controlled shaping of a curved patellar groove in a first trochlear portion of the selected area exposed through the opening; (b) a second bracket including a base presenting a proximally-facing contact surface and means for supporting the base in releasable engagement with the track, including a bore extending through the base in a longitudinal direction generally parallel to the long axis of the femur for guiding a second shaping tool in forming a relatively deep recess in a second portion of the selected area exposed through the opening for accommodating an intercondylar stabilized housing of a knee implant in the femur; and (c) means for accurately aligning the bore relative to the opening whole forming the recess. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Surgical instrumentation comprising, in combination:
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(a) a first bracket defining a generallly U-shaped structure having an internal surface adapted to be seated on the distal aspect of a resected femur and an elongated central opening appointed to expose a selected area of the resected femur, including a curved track for guiding a first shaping tool along a predetermined path for controlled shaping of a curved patellar groove in a trochlear portion of the selected area exposed through the opening; (b) a second bracket including a base presenting a proximally-facing contact surface and means for supporting the base in releasable engagement with the track, including a bore extending through the base with a generally cylindrical aperture and a pair of tangentially-formed slots extending the length of the aperture, the aperture having an axis generally parallel to the long axis of the femur and a stop located at a selected depth with the aperture; (c) an end mill which is received within and guided by the aperture for forming a relatively deep recess in the femur to accommodate an intercondylar stabilizing housing of a knee implant, including a shoulder which bottoms-out in the stop, controlling the depth of the recess being thereby formed; (d) a punch having a generally U-shaped cross-section corresponding to that of the slotted aperture and being received therein to cut away the remaining bore for the housing recess, including a sharpened U-shaped edge which bottoms-out a common proximal distance into the femur with the end mill; and (e) means for accurately aligning the bore relative to the opening while forming the recess.
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Specification