Piston based ventilator
First Claim
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1. A piston based ventilator system for providing breathing gas to a patient airway comprising:
- a source of said gas for providing a supply flow of said breathing gas;
a fixed volume cylinder including first and second cylinder ends and a movable center shaft slidably mounted therein, said first and second cylinder ends comprising first and second self-jigging end caps each defining axially located concentric bearing holes providing a narrow clearance gap between said bearing holes and said movable center shaft, and first and second bearing caps mounted to said first and second end caps, respectively, each of said bearing caps having a close fit opening therethrough for slidably receiving said shaft, and providing means for minimizing leakage of said breathing gas through a gap defined between said shaft and said bearing caps, said cylinder having inlet valve means to allow flow of said gas into said cylinder and outlet valve means allowing flow of said gas to the patient airway;
a piston head fixed to said shaft such that motion of said shaft along said cylinder centerline provides means for moving said piston head longitudinally between said first and said second ends of said cylinder, wherein said movement of said piston head from said first end to said second end displaces a volume of said gas to be delivered to the patient airway and said movement from said second end to said first end causes said gas to be drawn into said cylinder.
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Abstract
A piston based ventilator for delivering breathing gas to the lungs of a patient, and more particularly a piston based ventilator that delivers breathing gas to a patient upon longitudinal movement of a piston rod and associated piston head within a piston cylinder. The piston rod is centrally located within the cylinder and moves along the cylinder in response to direct drive from a motor to move the piston head within the cylinder and displace a volume of gas to be delivered to the patient.
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Citations
7 Claims
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1. A piston based ventilator system for providing breathing gas to a patient airway comprising:
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a source of said gas for providing a supply flow of said breathing gas; a fixed volume cylinder including first and second cylinder ends and a movable center shaft slidably mounted therein, said first and second cylinder ends comprising first and second self-jigging end caps each defining axially located concentric bearing holes providing a narrow clearance gap between said bearing holes and said movable center shaft, and first and second bearing caps mounted to said first and second end caps, respectively, each of said bearing caps having a close fit opening therethrough for slidably receiving said shaft, and providing means for minimizing leakage of said breathing gas through a gap defined between said shaft and said bearing caps, said cylinder having inlet valve means to allow flow of said gas into said cylinder and outlet valve means allowing flow of said gas to the patient airway; a piston head fixed to said shaft such that motion of said shaft along said cylinder centerline provides means for moving said piston head longitudinally between said first and said second ends of said cylinder, wherein said movement of said piston head from said first end to said second end displaces a volume of said gas to be delivered to the patient airway and said movement from said second end to said first end causes said gas to be drawn into said cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification