Gas delivery means
First Claim
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1. A system to cyclically deliver a controlled volume of gas through a line including:
- (a) A variable speed rotary compressor driven by a rotary electric motor to supply pressurized gas;
(b) valve means to direct gas from the compressor to the line during the delivery interval of the cycle, and to divert the gas between such intervals;
(c) control means to drive the compressor motor and to actuate the valve means said control means including;
Means to select and maintain the cycle frequency;
Means to select and control the time of the delivery interval;
Means to select a reference value of the delivered gas volume;
Means to measure the instantaneous flow rate of the gas supplied by the compressor during a delivery interval of the cycle;
Means to compute the average flow rate measurement during the delivery interval to provide a computed value of the delivered gas volume; and
Means to adjust the compressor speed in the next succeeding delivery interval by an increment related to the difference between the computed value of the delivered gas volume and the reference value of delivered gas volume in a direction to reduce the difference between said delivered gas volume and said reference gas volume.
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Abstract
The present invention provides a system that provides a gas delivery system which is capable of cyclically delivering a selectable volume of gas at a predetermined rate for a predetermined interval. This system is useful as a miniature respirator or as a wearable driver for a pneumatic total artificial heart. The system comprises compressor means; valve means to direct gas from the compressor to the line; control means to drive the compressor motor and actuate the valve means; means to measure flow rate and determine delivery volume; and means to adjust the compressor speed.
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Citations
17 Claims
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1. A system to cyclically deliver a controlled volume of gas through a line including:
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(a) A variable speed rotary compressor driven by a rotary electric motor to supply pressurized gas; (b) valve means to direct gas from the compressor to the line during the delivery interval of the cycle, and to divert the gas between such intervals; (c) control means to drive the compressor motor and to actuate the valve means said control means including; Means to select and maintain the cycle frequency; Means to select and control the time of the delivery interval; Means to select a reference value of the delivered gas volume; Means to measure the instantaneous flow rate of the gas supplied by the compressor during a delivery interval of the cycle; Means to compute the average flow rate measurement during the delivery interval to provide a computed value of the delivered gas volume; and Means to adjust the compressor speed in the next succeeding delivery interval by an increment related to the difference between the computed value of the delivered gas volume and the reference value of delivered gas volume in a direction to reduce the difference between said delivered gas volume and said reference gas volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A respirator which comprises:
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(a) outlet means for connection to an inspiration line; (b) a variable speed rotary compressor, driven by an electric compressor motor, to supply air to the said outlet means; (c) directional valve means, between said compressor and said outlet means, said directional valve means having an inlet port connected to said compressor, an outlet port connected to said outlet means, an exhaust port and a sealing poppet to selectively close and open said exhaust port to pass air from said compressor to said outlet means when the valve is closed, and when said valve is open, air is directed from said compressor to said exhaust port; (d) control means including a microcomputer with a connected to said electric compressor motor and to said directional valve means, said control means being adapted to maintain the volume of air delivered to outlet means at a selected value and to close said directional valve means during an inspiration interval; and (e) inspiration volume measuring means connected to said microcomputer for calculation of the volume of air delivered during an inspiration interval, and comparison with a selected reference value;
means for the incremental adjustment of the speed of said electric compressor motor in successive inspiration intervals to reduce the difference between the calculated and said selected reference value. - View Dependent Claims (14, 15, 16, 17)
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Specification