US Patent 7850624 Muscle thickness sensor

A muscle thickness sensor for measuring muscle thickness over a bone structure having a resilient frame placed over the muscle of interest and compressible material within the frame to sense muscle contractions. The compressible material is strain sensitive and generates a detectable signal when compressed due to muscle flexure. The sensor is able to differentiate between muscle contraction and muscle relaxation and is generally immune to signal noise caused by movement of bone structure and adjacent muscle groups.