Bymixer apparatus and method for fast-response, adjustable measurement of mixed gas fractions in ventilation circuits
First Claim
1. A bymixer device that is connectable to a respiratory gas flow conduit in a ventilation circuit used for ventilating a human or veterinary patient, said bymixer device comprising:
- a flow divider for dividing the flow of respiratory gas into first and second streams;
a main flow channel through which the first stream flows;
a bypass flow channel through which the second stream flows;
said bypass flow channel comprising a) a flow restrictor that restricts the flow of gas through the bypass flow channel, b) a mixing chamber positioned upstream of the flow restrictor and c) sampling apparatus for sampling respiratory gas from said mixing chamber.
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Accused Products
Abstract
A bymixer device and method which provides fast-response, accurate measurements of mixed inspired and/or expired gas fractions in open or closed ventilation circuits and/or in circle circuits used in anesthesia and/or critical care. The bymixer device may include a main flow channel and a bypass flow channel. The bypass flow channel includes a flow-restrictor (e.g, an orifice) that partially blocks the flow of respiratory gas through the bypass flow channel, a mixing chamber positioned upstream of the flow restrictor and a sampling apparatus (e.g., a port for withdrawing samples of gas from said mixing chamber and/or sensor(s) positioned within the mixing chamber).
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Citations
35 Claims
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1. A bymixer device that is connectable to a respiratory gas flow conduit in a ventilation circuit used for ventilating a human or veterinary patient, said bymixer device comprising:
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a flow divider for dividing the flow of respiratory gas into first and second streams;
a main flow channel through which the first stream flows;
a bypass flow channel through which the second stream flows;
said bypass flow channel comprising a) a flow restrictor that restricts the flow of gas through the bypass flow channel, b) a mixing chamber positioned upstream of the flow restrictor and c) sampling apparatus for sampling respiratory gas from said mixing chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for sampling mixed respiratory gas in a ventilation circuit for ventilating the lungs of a human or veterinary patient, said ventilation circuit including at least one inspiratory flow conduit through which inspiratory respiratory gas flows for delivery to the patient'"'"'s lungs and at least one expiratory flow conduit through which expired respiratory gas flows after having been expelled from the patient'"'"'s lungs, said method comprising the steps of:
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A. providing a bymixer device having i) a flow dividing manifold for dividing a flow of respiratory gas into first and second flow streams, ii) a main flow channel connected to the inflow manifold such that the first flow stream flows through the main flow channel, iii) a bypass flow channel connected to the inflow manifold such that the second flow stream flows through the bypass flow channel, said bypass flow channel comprising a flow-restrictor that partially blocks the flow of respiratory gas through the bypass flow channel and a mixing chamber positioned upstream of the flow restrictor such that mixed respiratory gas will collect in said mixing chamber. B. attaching the bymixer to either an inspiratory flow conduit or an expiratory flow conduit of the ventilation circuit such that either inspiratory respiratory gas or expiratory respiratory gas flows through the bypass channel and becomes mixed in the mixing chamber. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification