Knee Rehabilitation Device with Load Cell Feedback Control
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Solution Overview
Problem
Current rehabilitation methods for total knee replacement (TKR) patients face challenges in achieving full range of motion due to scar tissue formation and pain, with existing devices like continuous passive motion (CPM) machines lacking precision and variability in pressure application, leading to inadequate rehabilitation outcomes.
Innovation Solution
A device with a controller, actuation member, and load cell that adjusts movement based on measured forces to prevent excessive stress, allowing for customizable extension and flexion within the patient's comfort threshold, enabling gradual increase in range of motion while minimizing pain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If early range of motion therapy is applied to prevent scar tissue formation, then mobility recovery is improved, but patient pain increases significantly
Solution Approach 1:
The CPM machine dynamically adjusts the range of motion and motion amplitude based on patient tolerance, allowing therapy to progress from small to larger movements as pain decreases and mobility improves, resolving the contradiction between aggressive therapy and pain management
Solution Approach 2:
The device applies periodic passive motion cycles to the knee joint, creating rhythmic flexion and extension movements that gradually break down scar tissue without requiring sustained high-force manipulation that would cause excessive pain
2Productivity
If manual pressure is increased to break down scar tissue, then range of motion improvement is enhanced, but risk of joint damage increases
Solution Approach 1:
The patent replaces manual physical manipulation by therapists with an automated mechanical CPM system that applies controlled passive motion, eliminating the variability and potential for excessive force while maintaining effective scar tissue breakdown through consistent rhythmic movement
Solution Approach 2:
The system incorporates feedback mechanisms that monitor patient response and adjust motion parameters accordingly, allowing real-time modification of therapy intensity to prevent joint damage while maximizing range of motion gains
3Productivity
If CPM machine pushes aggressively to achieve full range of motion, then mobility recovery is accelerated, but patient pain and discomfort increase
Solution Approach 1:
The CPM machine transitions from static to dynamic operation, adjusting motion amplitude and speed based on patient needs, allowing aggressive therapy only when tolerated while providing gentler movements when pain is present, thus resolving the contradiction between speed and comfort
Data Source
AI summary
The present teachings provide for an exercise device for exercising a joint and a limb. The device includes a controller, an actuation member, a load cell, and a motor. The actuation member is controlled by the controller and is configured to extend and flex the limb. The load cell is mounted to the actuation member and configured to measure force between the limb and the actuation member. The motor is configured to control movement of the actuation member in response to inputs from the controller.