Soft tissue balancing in robotic knee surgery
AssigneeOrthosoft Inc.
InventorPierre Couture
Life of this patent
Estimating the term…
Abstract
A system and method may be used to evaluate soft tissue. A knee arthroplasty soft tissue evaluation may use an adjustable spacer, such as varying sized physical spacers or an inflatable bladder, along with a sensor to measure force, pressure, gap distance, or the like during a range of motion test. A method may include maintaining an equal pressure or gap distance for a medial component and a lateral component of an adjustable spacer during a range of motion test. Information, including, for example a maximum or minimum gap distance or pressure may be determined during the range of motion test. The determined information may be output for display or used to update a surgical plan.
Claims20
A surgical device for evaluating soft tissue during a surgical procedure comprising:
- a pump to:
- inflate a first adjustable component of an adjustable spacer to separate a femur and a tibia of a knee on a medial side of a patient;
- inflate a second adjustable component of the adjustable spacer to separate the femur and the tibia of the knee on a lateral side of the patient, the second adjustable component independently adjustable to the first adjustable component;
- and
- during a range of motion test, maintain an equal pressure in the first adjustable component and the second adjustable component by allowing a medial gap distance between the femur and the tibia caused by the first adjustable component or a lateral gap distance between the femur and the tibia the second adjustable component to change;
- and
- a processor to:
- determine a maximum gap distance during the range of motion test;
- and
- output the maximum gap distance for display on a user interface.
A surgical device for evaluating soft tissue during a surgical procedure comprising:
- a pump to:
- inflate a first adjustable component of an adjustable spacer to separate a femur and a tibia of a knee on a medial side of a patient;
- inflate a second adjustable component of the adjustable spacer to separate the femur and the tibia of the knee on a lateral side of the patient, the second adjustable component independently adjustable to the first adjustable component;
- during a range of motion test, maintain an equal gap distance between a medial gap of the knee caused by the first adjustable component and a lateral gap of the knee caused by the second adjustable component by increasing or decreasing pressure in the first adjustable component or the second adjustable component;
- a processor to:
- determine a maximum pressure during the range of motion test;
- and
- output the maximum pressure for display on a user interface.
A method comprising:
- inserting a trial between a femur and a tibia of a knee, the trial including a medial spacer of a first height and a lateral spacer of a second height differing from the first height;
- using a pressure sensor device, measuring pressure on a medial side of the knee and a lateral side of the knee throughout a range of motion test with the trial in place;
- determining a maximum pressure during the range of motion test;
- and
- outputting the maximum pressure for display on a user interface.
Dependencies are inferred from the claim text.