Patent ID: 9714878
Date: 2017-07-25
CPC Classifications: A24F,A61M,G01L,H01H,Y10T

Claim:
1. A pressure sensitive device, comprising: a hollow tube having a longitudinal axis and configured to permit air suction through one end portion of the tube; a ring fixedly mounted in the tube and having a central axis, a first side and a second side, the ring including a dielectric portion parallel to the central axis and between the first side and the second side; a flexible membrane disposed in the tube and mounted directly on a periphery of the ring on the first side, the flexible membrane including a conductive portion; and a perforated membrane disposed in the tube and connected to a periphery of the ring on the second side, the second side being closer to the one end portion that permits air suction therethrough relative to the first side, the perforated membrane being spaced apart and electrically isolated from the flexible membrane by the ring below a threshold pressure differential across the pressure sensitive device within the tube, the perforated membrane including an opening therethrough and a conductive portion facing and corresponding to the conductive portion of the flexible membrane such that a threshold pressure differential along the longitudinal direction of the tube across the pressure sensitive device causes the flexible membrane to be drawn into the perforated membrane by the suction such that deflection between the conductive portions of the flexible membrane and the perforated membrane along the longitudinal direction of the tube changes an electrical property.