Bone cutting system for the leg and method therefor

• US 9,615,887 B2
• Filed: 09/13/2013
• Issued: 04/11/2017
• Est. Priority Date: 03/18/2013
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: OrthoSensor, Inc (Stryker Corporation)
• Inventors: Stein, Marc, Roche, Martin
• Primary Examiner(s): Woodall, Nicholas
• Application Number:
  US14/027,104
• Publication Number:
  US 20140276863A1
• Time in Patent Office: 1,306 Days
• CPC Class Codes: A61B 17/154 for preparing bone for knee prosthesis
• 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 2034/102 Modelling of surgical devices, implants or prosthesis
• CPC Class Codes: A61B 2034/104 Modelling the effect of the tool, e.g. the effect of an implanted prosthesis or for predicting the effect of ablation or burring
• CPC Class Codes: A61B 2034/105 Modelling of the patient, e.g. for ligaments or bones
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61B 34/25 User interfaces for surgical systems
• CPC Class Codes: A61B 5/103 Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes A61B5/08 takes precedence; measuring aids for tailors A41H1/00; measuring instruments specially adapted for dentistry A61C19/04
• CPC Class Codes: A61B 5/1036 Measuring load distribution, e.g. podologic studies
• CPC Class Codes: A61B 5/1072 measuring distances on the body, e.g. measuring length, height or thickness A61B5/1076 takes precedence
• CPC Class Codes: A61B 5/1121 Determining geometric values, e.g. centre of rotation or angular range of movement
• CPC Class Codes: A61B 5/45 For evaluating or diagnosing the musculoskeletal system or teeth A61B5/1036, A61B5/1074, A61B7/006 take precedence
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 5/4571 Evaluating the hip
• CPC Class Codes: A61B 5/4585 Evaluating the knee
• CPC Class Codes: A61B 5/4851 Prosthesis assessment or monitoring
• CPC Class Codes: A61B 5/4887 Locating particular structures in or on the body
• CPC Class Codes: A61B 5/686 : Permanently implanted devices, e.g. pacemakers, other stimulators, biochips A61B5/6861 takes precedence
• CPC Class Codes: A61B 90/37 : Surgical systems with images on a monitor during operation
• CPC Class Codes: A61F 2/38 : for elbows or knees
• CPC Class Codes: A61F 2/3836 : Special connection between upper and lower leg, e.g. constrained
• CPC Class Codes: A61F 2/461 : of knees
• CPC Class Codes: A61F 2/4657 : Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2/4684 : Trial or dummy prostheses
• CPC Class Codes: A61F 2002/4658 : for measuring dimensions, e.g. length
• CPC Class Codes: A61F 2002/4668 : for measuring angles
• CPC Class Codes: G06F 3/0481 : based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance

Abstract

A knee bone cut system and method is disclosed. The knee bone cut system supports cutting an anterior portion of a distal end of a femur. The system comprises a sensored insert, a femoral rotation guide, and a remote system to receive and display sensor data. The sensored insert provide data related to load magnitude, position of load, and leg position. The femoral rotation guide has moveable condyles to adjust condyle position in a rapid manner. A pinch mechanism and lock mechanism respectively move the condyles into contact with the sensored insert. Moreover, the femoral rotation guide can be loaded similar to a final installed insert over a range of motion. For example, the patella can be placed on the femoral rotation guide allowing the patella to load the sensored insert. The femoral insert guide includes guide holes that are used in conjunction with a bone cutting jig.

Claims

1. A knee bone cut system comprising:

a sensored insert configured to measure load and position of load;

a femoral rotation guide configured to couple to a distal end of a femur wherein the femoral rotation guide is configured to couple to a knee ioint with a patella reduced over a range of motion, wherein the femoral rotation guide includes adjustable condyles configured to couple to articular surfaces of the sensored insert, wherein the femoral rotation guide includes drill guide holes configured to support cutting block installation to the femur, and wherein a position of at least one drill guide hole is configured to change as the adjustable condyles are adjusted;

and

a remote system configured to receive data from the sensored insert where the remote system is configured monitor load and position of load on the articular surfaces of the sensored insert over the range of motion.

2. The system of claim 1 wherein the condyle adjuster extends from the femoral rotation guide to support patellar movement.

3. The system of claim 2 where the femoral rotation guide includes a pinch mechanism configured to adjust position of the condyles.

4. The system of claim 3 where the femoral rotation guide includes a lock configured to fix a position of the adiustable condyles relative to the distal end of the femur.

5. The system of claim 4 where the locking mechanism clamps a scissor mechanism of the adiustable condyles.

6. The system of claim 5 wherein the pinch mechanism is configured to rotate a condyle about a pivot point when the condyle is not touching a corresponding articular surface of the sensored insert and wherein at least one guide hole rotates with the rotation of the condyle.

7. The system of claim 1 further including a femoral cutting block configured to cut a posterior portion of a distal end of the femur wherein the femoral cutting block couples to the drill guide holes.

8. A knee bone cut system comprising:

a sensored insert configured to measure load and position of load;

a femoral rotation guide configured to couple to a distal end of a femur where the femoral rotation guide configured to reposition condyles wherein the femoral rotation guide includes a condyle adjuster that is configured to rotate a condyle around a pivot point to couple to a corresponding surface on the sensored insert, wherein the femoral rotation guide includes a locking mechanism configured to lock the condyle adiuster after rotating the condyle, and wherein the femoral rotation guide is configured to couple to a knee joint with a patella reduced over a range of motion;

a remote system to configured to receive data from the sensored insert where the remote system is configured to monitor load and position of load on the articular surfaces of the sensored insert.

9. The knee bone cut system of claim 8 where the condyle adjuster extends away from the femoral rotation guide and is configured to allow a patella to be positioned on the femoral rotation guide to apply forces thereto.

10. The knee bone cut system of claim 8 where the femoral rotation guide comprises a polymer material.

11. The knee bone cut system of claim 8 where the femoral rotation guide includes drill guide holes configured to support cutting block installation to the femur.

12. The knee bone cut system of claim 11 further including a femoral cutting block configured to cut a posterior portion of a distal end of the femur wherein the femoral cutting block is configured to couple to the openings drilled using the drill guide holes of the femoral rotation guide.

13. The bone cut system of claim 8 where the femoral rotation guide and the sensored insert are configured to be disposable after surgery.