Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Patent
1995-07-31
1999-11-23
Lewis, Aaron J.
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
12820417, A61M 1600
Patent
active
059881640
ABSTRACT:
Breathing circuits for medical respiratory devices which have an inspiratory conduit for delivery of respiration-related aeriform substances to a patient, may also have a expiratory conduit, and, in any case are arranged to communicate with a patient interface, such as a wye (14), and have heating means for respiration-related aeriform substances in at least the inspiratory conduit. The heating means may be a heated-liquid heating tube (11) within at least the inspiratory conduit or an electrical heating wire (38) on or in an inspiratory conduit comprising respiratory hose (37). The tube is in circulatory relationship with a heated-liquid reservoir (13) and is arranged internally to contain heated liquid (30) from the reservoir, and to transfer heat from the liquid--by radiation and conduction from the tube wall--to the substances in the conduit. This transferred heat tends to inhibit or to control formation of dangerous aqueous condensate from the substances by compensating heat losses they otherwise sustain, enhancing their capacity to retain water vapor and providing an intra-conduit environment in which the condensate is unlikely to form. A manifold (12) enables the tube to extend to the expiratory conduit.
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Lewis Aaron J.
Ramm Walter C.
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