Re-breathing apparatus for non-invasive cardiac output, method of operation, and ventilator circuit so equipped
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United States of America Patent
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Oct 14, 2003
Grant Date -
N/A
app pub date -
Oct 21, 1999
filing date -
Oct 21, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A re-breathing apparatus including a novel dual chamber reservoir connected to a ventilator circuit by means of a diverting adapter. The dual chamber reservoir utilizes two gas chambers which can be operated in reciprocating fashion. To accomplish re-breathing, expired gas is drawn into one chamber, while gas is ejected from the other chamber. The expired gas is then ejected into the breathing circuit as the patient inspires, while a charge of fresh gas is drawn into the other chamber. The diverting adaptor minimizes mixing of gases being drawn into and ejected from the two chambers. An advantage of the inventive method is that the total volume of gases in the system can be kept constant throughout re-breathing. The preferred embodiment of the inventive reservoir is a one-piece, blow-molded plastic, bellows-like structure which can be manufactured simply and inexpensively for one-time (disposable) use. Actuation of the system may be performed under microprocessor control.
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