Patent ID: 8643478
Filing Date: 2014-02-04
Classification: A61G,A61M,H01H

Abstract:
1. In a pneumatically actuated switching device in a patient call system having a switch device for generating an electrical signal, a mouth pipe unit comprising: a mouth pipe in communication with the air tube for receiving air for activation of the switch device and comprised of a one-piece transparent member; a porous filter structured to be wedged in the mouthpiece and comprised of a relatively, rigid material, and having a pore size ranging from about 90 microns to about 130 microns; wherein the mouth pipe comprises a first diameter section, a transition section and an enlarged second diameter section in communication with the first diameter section and the transition section; wherein the first diameter section, the transition section, and the enlarged second diameter section comprise a continuous airway; and wherein the porous filter is wedged within the enlarged second diameter section of the mouth pipe.