LOW PROFILE PATIENT SPECIFIC CUTTING BLOCKS FOR A KNEE JOINT

• US 20110092977A1
• Filed: 03/03/2009
• Published: 04/21/2011
• Est. Priority Date: 03/03/2008
• Status: Active Grant

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Inventors: Mehl, David Timothy, Agnihotri, Aashiish, Salehi, Abraham Biglari, Nadzadi, Mark Ellsworth, Jordan, Jason Sean
• Granted Patent: US 9,033,991 B2
• Time in Patent Office: Days
• US Class Current: 606/88
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 2034/108 Computer aided selection or customisation of medical implants or cutting guides

Abstract

A low profile patient specific cutting block for a knee comprises a plurality of bone interfacing portions and a cutting slot. The plurality of bone interfacing portions are configured to overlie portions of an end of a bone. The bone interfacing portions each have a surface generally a negative of the portion of the bone the bone interfacing portion overlies. The bone interfacing portions are angularly offset from each other such that a first of the bone interfacing portions overlies an anterior portion of the bone and a second of the bone interfacing portions overlies a portion of bone generally perpendicular to the anterior portion of hone. The cutting slot is oriented in a fixed position relative to the bone interfacing portions such that the cutting slot directs a cutting tool at a fixed angle and at a fixed depth from the bone interfacing portions.

Claims

1. A low profile patient specific cutting block for a knee, comprising:

a. a plurality of bone interfacing portions configured to overlie portions of an end of a bone, the bone interfacing portions each having a surface generally a negative of the portion of the bone the bone interfacing portion overlies, the bone interfacing portions being angularly offset from each other such that a first of the bone interfacing portions overlies an anterior portion of the bone and a second of the bone interfacing portions overlies a portion of bone generally perpendicular to the anterior portion of bone; and

b. a cutting slot oriented in a fixed position relative to the bone interfacing portions, such that the cutting slot directs a cutting tool at a fixed angle and at a fixed depth from the bone interfacing portions.

2. The low profile patient specific cutting block of claim 1, wherein the low profile patient specific cutting block is a femoral cutting block and further comprises bosses having a thickness and an aperture extending through the bosses, the aperture having a diameter, the bosses configured to direct a pin through the boss, the thickness of the boss being greater than the diameter of the aperture.

3. The low profile patient specific cutting block of claim 1, wherein the bone interfacing portions are generally oriented in the middle of the low profile patient specific cutting block in an anterior portion of the low profile patient specific cutting block and are oriented medially and laterally at a posterior portion of the low profile patient specific cutting block.

4. The low profile patient specific cutting block of claim 1, wherein the low profile patient specific cutting block is a tibial block and the cutting slot is offset and medialized relative to the tibial bone.

5. The low profile patient specific cutting block of claim 4, further comprising a paddle extending posteriolaterally from a middle portion of the patient specific cutting block, the paddle having a raised portion anteriorly oriented on the low profile patient specific cutting block such that the paddle does not touch the tibia on an anterior proximal surface and does touch the tibia on a posterior proximal surface.

6. A low profile patient specific cutting block for a knee, comprising:

a. a plurality of bone interfacing portions configured to overlie portions of an end of a bone, the bone interfacing portions each having a surface generally a negative of the portion of the bone the bone interfacing portion overlies, the bone interfacing portions being angularly offset from each other such that a first of the bone interfacing portions overlies an anterior portion of the bone and a second of the bone interfacing portions overlies a portion of bone generally perpendicular to the anterior portion of bone; and

b. a cutting slot oriented in a fixed position relative to the bone interfacing portions, such that the cutting slot directs a cutting tool.

7. The low profile patient specific cutting block of claim 6, wherein the low profile patient specific cutting block is a femoral cutting block and further comprises bosses having a thickness and an aperture extending through the bosses, the aperture having a diameter, the bosses configured to direct a pin through the boss, the thickness of the boss being greater than the diameter of the aperture.

8. The low profile patient specific cutting block of claim 6, wherein the bone interfacing portions are generally oriented in the middle of the low profile patient specific cutting block in an anterior portion of the low profile patient specific cutting block and are oriented medially and laterally at a posterior portion of the low profile patient specific cutting block.

9. The low profile patient specific cutting block of claim 6, wherein the low profile patient specific cutting block is a tibial block and the cutting slot is offset and medialized relative to the tibial bone.

10. The low profile patient specific cutting block of claim 9, further comprising a paddle extending posteriolaterally from a middle portion of the patient specific cutting block, the paddle having a raised portion anteriorly oriented on the low profile patient specific cutting block such that the paddle does not touch the tibia on an anterior proximal surface and does touch the tibia on a posterior proximal surface.

11. A low profile patient specific cutting block for a knee, comprising:

a. a plurality of bone interfacing portions configured to overlie portions of an end of a bone, the bone interfacing portions each having a surface generally a negative of the portion of the bone the bone interfacing portion overlies, the bone interfacing portions being angularly offset from each other such that a first of the bone interfacing portions overlies an anterior portion of the bone and a second of the bone interfacing portions overlies a portion of bone generally perpendicular to the anterior portion of bone; and

b. a cutting slot oriented in a fixed position relative to the bone interfacing portions, such that the cutting slot directs a cutting tool, wherein the bone interfacing portions are generally oriented in the middle of the low profile patient specific cutting block in an anterior portion of the low profile patient specific cutting block and are oriented medially and laterally at a posterior portion of the low profile patient specific cutting block.

12. The low profile patient specific cutting block of claim 11, wherein the low profile patient specific cutting block is a femoral cutting block and further comprises bosses having a thickness and an aperture extending through the bosses, the aperture having a diameter, the bosses configured to direct a pin through the boss, the thickness of the boss being greater than the diameter of the aperture.

13. The low profile patient specific cutting block of claim 11, wherein the low profile patient specific cutting block is a tibial block and the cutting slot is offset and medialized relative to the tibial bone.

14. The low profile patient specific cutting block of claim 13, further comprising a paddle extending posteriolaterally from a middle portion of the patient specific cutting block, the paddle having a raised portion anteriorly oriented on the low profile patient specific cutting block such that the paddle does not touch the tibia on an anterior proximal surface and does touch the tibia on a posterior proximal surface.