- Patent Number:
9,138,241
- Appl. No:
14/035111
- Application Filed:
September 24, 2013
- نبذة مختصرة :
Methods and apparatus provide for modifying a patient's femur to receive a patellofemoral prosthesis, including: a distal punch, an anterior punch and a trochlear punch which are used in well defined orientations to remove material from the femur to accommodate complex geometries of a patellofemoral prosthesis; and optionally a guide operating to engage a distal end of the femur, the guide including a distal slot, an anterior slot and a transverse slot, which ensure that the punches achieve the desired orientations.
- Inventors:
Arthrex, Inc. (Naples, FL, US)
- Assignees:
Arthrex, Inc. (Naples, FL, US)
- Claim:
1. An apparatus for modifying a femur for receiving a patellofemoral prosthesis, the apparatus comprising: a distal punch having a cutting edge sized and shaped to penetrate into a patellar groove of the femur in a distal-proximal direction to produce a distal cut; an anterior punch having a cutting edge sized and shaped to penetrate into the patellar groove of the femur in an anterior-posterior direction to produce an anterior cut; and a trochlear punch having a cutting edge sized and shaped to penetrate through an anterior surface of the femur and through the anterior cut to form a trochlear cut in both an anterior portion and a distal portion of the femur, and a first punch of the distal punch, the anterior punch and the trochlear punch includes a first elongated body extending along a first longitudinal axis and including a first cutting edge extending in a first plane that is transverse to the first longitudinal axis and a second punch of the distal punch, the anterior punch and the trochlear punch includes a second elongated body extending along a second longitudinal axis and including a second cutting edge extending in a second plane that is transverse to the second longitudinal axis of the second punch, wherein the first plane and the second plane are not parallel to each other.
- Claim:
2. The apparatus of claim 1 wherein the cutting edge of the distal punch defines the distal cut as V-shaped when viewed in the distal-proximal direction.
- Claim:
3. The apparatus of claim 2 wherein the V-shaped distal cut includes a rounded inflection region.
- Claim:
4. The apparatus of claim 3 wherein the cutting edge of the trochlear punch defines the trochlear cut as V-shaped when viewed in a transverse direction.
- Claim:
5. The apparatus of claim 4 wherein the V-shaped trochlear cut includes a rounded inflection region.
- Claim:
6. The apparatus of claim 2 wherein the cutting edge of the anterior punch intersects the distal cut to define the anterior cut as V-shaped when viewed in the distal-proximal direction.
- Claim:
7. The apparatus of claim 6 wherein the V-shaped anterior cut includes a rounded inflection region.
- Claim:
8. The apparatus of claim 1 wherein the distal punch includes a depth limiting feature operating to indicate a limit to which the cutting edge of the distal punch should extend in the distal-proximal direction into the femur to define a depth of the distal cut.
- Claim:
9. The apparatus of claim 1 wherein the anterior punch includes a depth limiting feature operating to indicate a limit to which the cutting edge of the anterior punch should extend in the anterior-posterior direction to define an anterior-posterior depth of the anterior cut.
- Claim:
10. The apparatus of claim 1 wherein the trochlear punch is sized and shaped such that, when oriented in a transverse direction, the trochlear cut intersects both the distal cut and the anterior cut.
- Claim:
11. The apparatus of claim 10 wherein the transverse direction extends about 15-45° with respect to at least one of the anterior surface of the femur and the distal-proximal direction.
- Claim:
12. The apparatus of claim 10 wherein the transverse direction extends about 30° with respect to at least one of the anterior surface of the femur and the distal-proximal direction.
- Claim:
13. The apparatus of claim 1 wherein the cutting edge of the distal punch defines a V-shaped edge that includes a rounded inflection region and cutting edge walls that transversely extend from the rounded inflection region in a direction away from one another.
- Claim:
14. The apparatus of claim 1 wherein the distal punch includes a collar proximal to the cutting edge, the collar configured to control a depth of the distal cut.
- Claim:
15. The apparatus of claim 1 wherein the anterior punch includes a collar proximal to the cutting edge, the collar configured to control a depth of the anterior cut.
- Claim:
16. The apparatus of claim 1 wherein the cutting edge of the anterior punch defines a V-shaped edge that includes a rounded inflection region and cutting edge walls that transversely extend from the rounded inflection region in a direction away from one another.
- Claim:
17. The apparatus of claim 1 wherein the trochlear cut includes a concave or grooved cross section.
- Claim:
18. The apparatus of claim 1 wherein the trochlear punch includes a collar proximal to the cutting edge, the collar configured to control a depth of the trochlear cut.
- Claim:
19. The apparatus of claim 1 wherein the cutting edge of the trochlear punch defines a V-shaped edge that includes a rounded inflection region and cutting edge walls that transversely extend from the rounded inflection region in a direction away from one another.
- Patent References Cited:
5405349 April 1995 Burkinshaw et al.
5709689 January 1998 Ferrante et al.
5769854 June 1998 Bastian et al.
2004/0153066 August 2004 Coon et al.
- Other References:
Extended European Search Report dated Jan. 9, 2012 for EP Application No. 11250841.1. cited by applicant
- Assistant Examiner:
Kamikawa, Tracy
- Primary Examiner:
Schaper, Michael T
- Attorney, Agent or Firm:
Carlson, Gaskey & Olds
- الرقم المعرف:
edspgr.09138241
Processing Request
No Comments.