VENTILATOR WITH PISTON-CYLINDER AND BUFFER VOLUME
First Claim
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1. A mechanical ventilator device, comprising:
- a motor;
a cylinder, including;
a gas inlet;
a gas outlet;
a piston, wherein the motor moves the piston within the cylinder to draw gas in and expel gas from the cylinder;
a buffer volume in communication with the gas outlet of the cylinder, wherein the buffer volume holds pressurized gas delivered to the buffer volume from the gas outlet of the cylinder; and
an outlet valve in communication with the buffer volume, wherein pressurized gas can be selectively released from the buffer volume by operation of the outlet valve.
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Abstract
A mechanical ventilator is provided with a piston-cylinder for performing an air displacement function and a buffer volume and associated output valve for providing an air metering function. The piston-cylinder may comprise a reciprocating arrangement, in which compressed air is supplied to the buffer volume with each stroke of the piston.
170 Citations
20 Claims
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1. A mechanical ventilator device, comprising:
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a motor; a cylinder, including; a gas inlet; a gas outlet; a piston, wherein the motor moves the piston within the cylinder to draw gas in and expel gas from the cylinder; a buffer volume in communication with the gas outlet of the cylinder, wherein the buffer volume holds pressurized gas delivered to the buffer volume from the gas outlet of the cylinder; and an outlet valve in communication with the buffer volume, wherein pressurized gas can be selectively released from the buffer volume by operation of the outlet valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for providing respiratory air to a patient, comprising:
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compressing a molecular oxygen-containing gas by driving a reciprocating piston within a cylinder; charging a buffer volume with compressed molecular oxygen-containing gas supplied from the reciprocation of the piston within the cylinder; and releasing compressed molecular oxygen-containing gas from the buffer volume for delivery to a patient. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for providing mechanical ventilation, comprising:
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compressing molecular oxygen-containing gas by driving a reciprocating piston, including; in a first mode; moving the piston in a first direction within the cylinder; forcing compressed molecular oxygen-containing gas out of a second region of the cylinder on a second side of the piston through a first outlet port; drawing molecular oxygen-containing gas into a first region of the cylinder on a first side of the piston through a first intake port; in a second mode; moving the piston in a second direction within the cylinder; forcing compressed molecular oxygen-containing gas out of the first region of the cylinder on the first side of the piston through a second outlet port; drawing molecular oxygen-containing gas into the second region of the cylinder on the second side of the piston through a second intake port; in both the first and second modes, delivering the compressed molecular oxygen-containing gas to a buffer volume; and releasing compressed molecular oxygen-containing gas from the buffer volume through a variable valve. - View Dependent Claims (18, 19, 20)
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Specification