Apparatus for relating pain and activity experienced by a patient comprises: pain transducing means for allowing a patient to select any one pain level from a predetermined number of pain levels and for producing a pain level signal indicative of the selected level; activity transducing means responsive...http://www.google.com.tw/patents/US6168569?utm_source=gb-gplus-share專利 US6168569 - Apparatus and method for relating pain and activity of a patient
