New Clinical Bymixer for Fast-Response, Adjustable Measurement of Mixed Expired Gas Fractions in the Anesthesia Circle Circuit
The new clinical bymixer is constructed from standard anesthesia circuit components, attaches easily to the anesthesia machine's inspired outlet and expired inlet ports, is simple to clean and sterilize, and has no reservoir to trap condensed water vapor from expired gas. Introduction of this new clinical bymixer will facilitate indirect calorimetry during anesthesia and the non-invasive detection of metabolic upset (e.g. onset of anaerobic metabolism) and critical events (e.g. onset of pulmonary embolism).
University of California, Irvine researchers have developed a new bymixer from common components that solves these problems. The technology incorporates a novel, parallel design into a new clinical bymixer, which by-passes a constant fraction of total flow through a mixing chamber. The bymixer provides accurate measurement of mixed expired gas fractions in the anesthesia circle circuit, over a wide range of tidal volume (300-1200 ml), frequency (6-20 breaths/mm), and partial pressure of carbon dioxide (PCO2, 6-50 mm Hg). Simple changes in mixing chamber volume provide adjustable bymixer response time. Fast bymixer response will allow VO2 and CO2 elimination measurements to be updated in less than 1 min (bymixer time constant of 12 sec allows 95% bymixer response by 36 sec).
Patent Number: US7793659B2
Application Number: US2003530602A
Inventor: Breen, Peter H.
Priority Date: 11 Oct 2002
Priority Number: US7793659B2
Application Date: 14 Nov 2005
Publication Date: 14 Sep 2010
IPC Current: A61M001600 | A61M001500
US Class: 12820418 | 12820024
Assignee Applicant: The Regents of the University of California
Title: Bymixer apparatus and method for fast-response, adjustable measurement of mixed gas fractions in ventilation circuits
Usefulness: Bymixer apparatus and method for fast-response, adjustable measurement of mixed gas fractions in ventilation circuits
Summary: Bymixer device used for patients suffering from anesthesia, critical care medicine, ventilation and monitoring of pulmonary function. Used for human or veterinary patients.
Novelty: Bymixer device used for anesthesia on human or veterinary patients, has bypass flow channel formed by flow dividing manifold, comprising orifice, mixing chamber and sampling port
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7793659
Tech ID/UC Case 18875/2003-124-0 Related Cases 2003-124-0
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