Patent ID: 6652469
Filing Date: 2003-11-25
Classification: A61B

Abstract:
A movement detector pad comprising a pair of flat plates supported spaced apart in juxtaposed facial alignment and disposed in substantially parallel relationship by resilient attachment members secured between said plates at predetermined positions adjacent an outer circumferential edge of said plates, a piezoelectric compression transducer secured between said plates substantially centrally thereof and generating electric signals when said plates are displaced with respect to one another by displacement of an exterior load positioned above a top one of said plates, said top one of said plates being a collector plate and the other plate being a backing plate; said resilient attachment members spring biasing said plates apart and interconnecting said plates in corner areas thereof, said resilient attachment members each has a connector pin connected to one of said plates and extending transversely to an inner surface of said plate, said connector pin having lateral projecting mean spaced a predetermined distance from said inner surface, and a pin receiving hollow node projecting above an inner surface, of the other of said plates and aligned with said connector pin; said hollow node having a flat top wall with a hole therein for receiving said pin therethrough, a ledge formed about said hole by said top wall, said pin extending into said hole with said lateral projecting means captive thereunder and disposed for facial contact with an inner face of said ledge when biased theragainst, and spring means to spring bias said plates apart with said plates being connected together by said connector pin captive in said node with said lateral projecting means biased against said ledge.