A disposable pricker has a two part body with the parts connected by a hinge (6). A spring (10) and a lancet (1) are entered in one tubular part (7) which is then hinged to a ready position in which the leading end of the lancet, projecting from the tube (7), is confined by guide (17,22) on the other...http://www.google.com.tw/patents/US5100428?utm_source=gb-gplus-share專利 US5100428 - Disposable two part body pricker
