Device for compensating for flow resistance in a ventilator/respirator
AssigneeSiemens Elema AB
InventorsErik Krahbichler, Fredrik Jalde
Life of this patent
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Abstract
A device for compensating for flow resistance in an expiratory section of a ventilator system has a bellows system whose increase in volume during expiration is regulated by a regulatory device and a control unit, so that expired gas fills the bellows system. The increase in volume is regulated according to values measured for pressure so virtually complete compensation for flow resistance is attained. Pressure is measured with a first pressure gauge located by the bellows system, and a second pressure gauge located by the patient. The device can be a separate apparatus which is connectable to a ventilator, or can be totally integrated into the ventilator.
Claims9
A device for compensating for flow resistance in an expiratory section of a breathing assist device, comprising:
- means for determining a pressure in a patient's lungs and for generating an output signal indicative of said pressure;
- a negative pressure generating system which generates a negative pressure relative to said pressure in a patient's lungs, said negative pressure generating system comprising a bellows system connected between a first valve and a second valve;
- and
- control means for controlling said negative pressure generating system for regulating said bellows system during expiratory phases and responsive to said output signal of said means for determining a pressure in a patient's lungs for causing said bellows system to receive expired gas via said first valve for generating a target negative pressure relative to said pressure in a patient's lungs.
A breathing assist system comprising:
- an expiratory section having an expiratory valve;
- means, connected in said expiratory system upstream from said expiratory valve, for compensating for flow resistance in said expiratory system;
- and
- said means for compensating for flow resistance comprising means for determining a pressure in a patient's lungs and for generating an output signal indicative of said pressure;
- a negative pressure generating system which generates a negative pressure relative to said pressure in a patient's lungs, said negative pressure generating system comprising a bellows system connected between a first valve and a second valve;
- and
- control means for controlling said negative pressure generating system for regulating said bellows system during expiratory phases and responsive to said output signal of said means for determining a pressure in a patient's lungs for causing said bellows system to receive expired gas via said first valve for generating a target negative pressure relative to said pressure in a patient's lungs.
Dependencies are inferred from the claim text.