Patent
Detection of bellows collapsed condition in medical ventilator
TLDR
An improved system for determining the collapse of a bellows within a canister as part of a ventilator system for delivering breaths to a patient via a patient circuit is presented in this article.Abstract:
An improved system for the determining the collapse of a bellows within a canister as part of a ventilator system for delivering breaths to a patient via a patient circuit. The system measures the pressure in the bellows canister external of the bellows and measures the pressure within the interior of the bellow. A processor compares the pressures and determines when the pressure within the canister exceeds a predetermined offset in excess of the pressure within the interior of the bellows to conclude that the bellows is in a collapsed condition. In the preferred embodiment, the processor also uses, as input data, the flow delivered by the ventilator to the bellows canister to determine that offset value. When a bellows empty condition is determined, various actions can be taken, among them to signal an alarm and also to change various functions of the ventilator to prevent further difficulties in the overall system. In addition, the recognition of a bellows collapsed condition and an alarm or remedial action provides a safety measure to the patient in the event the pressure sensor that measures the pressure in the patient breathing circuit is missing or fails to a zero level.read more
Citations
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Patent
System and method for adjustable disconnection sensitivity for disconnection and occlusion detection in a patient ventilator
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Flow rate compensation for transient thermal response of hot-wire anemometers
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References
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Patent
Anesthesia rebreathing system
Melvyn L. Henkin,Jordan M. Laby +1 more
TL;DR: An anesthesia rebreathing system as mentioned in this paper includes a single use structural portion (56) and a reusable structural part (50, 52, 54) configured so as to be readily latched together to couple respective fresh gas interface ports (103, 105) and patient overflow ports (108).
Patent
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Erkki Heinonen,Markku Hyvoenen +1 more
TL;DR: In this paper, an apparatus for the regulation of a gas volume delivered to a patient during a respiratory cycle was proposed, which included at least one valve (9 or 8) for discharging some of the propellant gas flown from a source into a gas chamber and a second chamber on the other side of a wall.