Design and development of touch screen based Continuous Passive Motion device for knee rehabilitation

Continuous Passive Motion (CPM) device is commonly used for knee rehabilitation to recover the range of motion or to lessen edema and swelling of the knee following injuries or surgeries. The objectives of this work are to design and develop a touch screen based CPM device for knee rehabilitation. The device is capable of flexing/extending the knee joint in the range of motion from 0 degrees to 120 degrees with the speed of 30 degrees/minute to 150 degrees/minute. The device consists of a touch screen input/graphic color LCD, a microcontroller, a motor driver, a DC motor, an encoder, two safety sensors, an original point sensor and a mechanical part. The developed CPM device gives better benefits associated with its conventional counterparts since it has a portable size with a smooth motion of the motor system and offers the same anatomical adjustability. With the advantages of a touch screen based controller, the device also provides a user friendly interface for the controller.