Patent ID: 6082357
Filing Date: 2000-07-04
Classification: A61M

Abstract:
A mechanical ventilator comprising a hollow chamber having an interior wall,an air displacement member mounted for oscillating movement in said chamber, said air displacement member having first and second opposed air displacing faces, and a free outer surface between said faces,motor means to oscillate said displacement member in said chamber such that said free outer surface of said displacement member is maintained in closely spaced apart relationship with said interior wall throughout said oscillating movement,first and second variable zones defined in said chamber, said first zone being defined between said first face and said interior wall and said second zone being defined between said second face and said interior wall, andan air outlet and an air inlet in said first variable zone and an air flow port in said second variable zone for flow of air in and out of said second zone, andsaid closely spaced apart relationship being selected such that resistance to air flow between said free outer surface and said interior wall is greater than mechanical impedance of a patient receiving air discharged from said air outlet.