An accelerometer-based, multi-axis physical activity sensor for use with a rate-responsive pacemaker, and a method for fabricating the sensor, are provided. The multi-axis physical activity sensor includes a cantilever beam having a film of a piezoelectric polymer adhered to each surface of an...http://www.google.com.tw/patents/US5833713?utm_source=gb-gplus-share專利 US5833713 - Rate responsive pacemaker having an accelerometer-based physical activity sensor 
