Patellar cutting guide

• US 20060161165A1
• Filed: 03/14/2006
• Published: 07/20/2006
• Est. Priority Date: 05/10/2002
• Status: Active Grant

• Current Assignee: Todd V. Swanson
• Original Assignee: Todd V. Swanson
• Inventors: Swanson, Todd V.
• Granted Patent: US 7,604,639 B2
• Time in Patent Office: Days
• US Class Current: 606/87
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 17/158 Cutting patella
• CPC Class Codes: A61B 2017/564 Methods for bone or joint treatment
• CPC Class Codes: A61B 2034/102 Modelling of surgical devices, implants or prosthesis
• CPC Class Codes: A61B 2034/105 Modelling of the patient, e.g. for ligaments or bones
• CPC Class Codes: A61B 2034/2055 Optical tracking systems
• CPC Class Codes: A61B 2034/2072 Reference field transducer attached to an instrument or patient
• CPC Class Codes: A61B 2090/3983 Reference marker arrangements for use with image guided surgery
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61F 2/3886 for stabilising knees against anterior or lateral dislocations

Abstract

A patellar cutting guide is particularly useful in a method of minimally invasive knee arthroplasty in which an incision is made along the medial or lateral aspect of a patient'"'"'s knee, exposing the knee joint. The patellar cutting guide includes a clamp configured to be located exterior to the knee over the anterior portion of the patella, a stop having at least one portion configured to extend through an incision to a location posterior to the patella, and a cutting guide defining a cutting slot. The clamp may have outwardly extending spikes for passage through the tissue overlying the patella and into engagement with the patella. The stop is movable relative to the clamp and/or cutting guide. In one embodiment, the cutting guide is offset laterally and posteriorly relative to the clamp so that the slot is aligned with a medially or laterally-formed incision in the knee.

Claims

1. A patellar cutting guide for use in resecting a posterior portion of a patella through an incision generally located along the medial or lateral mid-line of a knee, comprising:

a stop for location posterior to a posterior portion of said patella;

a cutting guide, said cutting guide having a generally longitudinal slot therein for accepting a cutting implement for resecting a posterior portion of said patella;

a clamp having at least one spike extending therefrom in a direction of said stop, said spike adapted to penetrate the skin and engage an anterior portion of said patella; and

means for moving said clamp relative to said stop, whereby said clamp and stop may be moved into relative positions in which they secure said patella in a fixed position while said cutting implement is utilized to resect said patella.

2. The patellar cutting guide in accordance with claim 1 wherein said means for moving comprises a pivoting connection of said clamp and stop.

3. The patellar cutting guide in accordance with claim 2 wherein said pivoting connection comprises at least one pin, and including a first lever arm extending from a portion of said clamp opposite said pin and a second lever arm extending from a portion of said stop opposite said pin.

4. The patellar cutting guide in accordance with claim 1 wherein said cutting guide is connected to said clamp.

5. A patellar cutting guide for use in resecting a posterior portion of a patella of a knee of a patient, comprising:

a stop, said stop having a proximal portion and a distal portion, said distal portion configured to be extended through an incision in said knee; and

a body configured to be located exterior to a knee of a patient, said body defining an elongate slot through which a cutting implement may be passed for resecting a posterior portion of said patella, said body further defining a clamp configured to engage said knee at said anterior of said patella, said stop and said body movably connected to one another whereby said stop and body may be moved relative to one another.

6. The patellar cutting guide in accordance with claim 5 wherein said clamp defines a plurality of outwardly extending spikes.

7. The patellar cutting guide in accordance with claim 6 wherein said spikes extend towards said stop.

8. The patellar cutting guide in accordance with claim 5 wherein in said body and said stop are pivotally connected by at least one pin.

9. The patellar cutting guide in accordance with claim 5 wherein said clamp of said body and said stop lie generally in a first plane on at opposing sides of said patella when said cutting guide is in position and said slot is located in a guideway which is located in a second plane which is offset from said first plane.

10. The patellar cutting guide in accordance with claim 5 wherein said slot is defined by a guideway portion of said body.

11. The patellar cutting guide in accordance with claim 5 wherein said clamp and said stop extend outwardly in opposing directions from one another from a point at which said body and stop are connected to one another for relative movement.

12. The patellar cutting guide in accordance with claim 5 wherein said proximal portion of said stop comprises a first lever arm and wherein said body is connected to a second lever arm.

13. A patellar cutting guide for use in resecting the posterior of a patella through a lateral incision in a knee of a patient comprising:

a clamp configured to engage said exterior of said knee overlying said anterior portion of said patella;

a stop having a proximal portion and a distal portion, said proximal portion configured to pass through said lateral incision and engage a posterior portion of said patella while said proximal portion remains exterior to said knee; and

a cutting guide, said cutting guide offset laterally and posteriorly from said clamp, said cutting guide defining a cutting slot, said slot aligned with said lateral incision when said clamp and stop engage said patella.

14. The patellar cutting guide in accordance with claim 13 including one or more spikes extending from said clamp for passage through tissue overlying said anterior portion of said patella and pass into engagement with said patella.

15. The patellar cutting guide in accordance with claim 13 wherein said clamp and cutting guide are defined by a body.

16. The patellar cutting guide in accordance with claim 15 wherein said body defines a lever arm and said lever arm and said distal portion of said stop are movable connected to one another, permitting the relative position of said stop to be changed relative to said body.