Patent ID: 6152135
Filing Date: 2000-11-28
Classification: A61M

Abstract:
A ventilator for patients needing assistance in breathing, comprising:a) a compressor having an air input and an air output, and being arranged to compress said air at said output to a first pressure level;b) a flow valve having an inlet and an outlet, and a valving element interposed therebetween, said air at said first pressure level being applied to said inlet, and said air exiting said outlet at a second pressure level;c) a bypass valve arranged to receive a portion of said air at said first pressure level and to discharge said air into the input side of said compressor when said bypass valve is open;d) said bypass valve being biased with a bias toward the closed position and being further so connected to said outlet of said flow valve that said bypass valve opens whenever said first pressure level exceeds the sum of said bias plus said second pressure level; ande) a conduit arranged to introduce said air exiting said outlet into the lungs of said patient.