MECHANICAL VENTILATION SYSTEM UTILIZING BIAS VALVE
First Claim
1. An apparatus for use with a gas source for producing gas flow to a receiver circuit, comprising;
- a first valve connected to the receiver circuit;
a control module configured to control the first valve;
a second valve connected between the gas source and the receiver circuit, wherein the second valve is configured to provide an elevated drive pressure at the control module relative to a downstream pressure at the receiver circuit.
7 Assignments
0 Petitions
Accused Products
Abstract
A portable mechanical ventilator having a Roots blower is configured to provide a desired gas flow and pressure to a patient circuit. The mechanical ventilator includes a flow meter operative to measure gas flow produced by the Roots blower and an exhalation control module configured to operate an exhalation valve connected to the patient circuit. A bias valve connected between the Roots blower and the patient circuit is specifically configured to generate a bias pressure relative to the patient circuit pressure at the exhalation control module. The bias valve is further configured to attenuate pulsating gas flow produced by the Roots blower such that gas flowing to the mass flow meter exhibits a substantially constant pressure characteristic. The bias pressure facilitates closing of the exhalation valve at the start of inspiration, regulates positive end expiratory pressure during exhalation, and purges sense lines via a pressure transducer module.
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Citations
36 Claims
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1. An apparatus for use with a gas source for producing gas flow to a receiver circuit, comprising;
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a first valve connected to the receiver circuit; a control module configured to control the first valve; a second valve connected between the gas source and the receiver circuit, wherein the second valve is configured to provide an elevated drive pressure at the control module relative to a downstream pressure at the receiver circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. The apparatus as claimed in claim 310 wherein:
the second valve includes a cylinder and a poppet being configured to be reciprocatively slidable within the cylinder to define a substantially narrow poppet clearance between the poppet and cylinder, and wherein the poppet clearance is sized to generate viscous damping of the pulsating gas flow when gas passes through the poppet clearance during poppet reciprocation.
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13. A ventilator apparatus comprising:
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a patient circuit; a blower assembly that produces a gas flow to the patient circuit; an exhalation valve connected to the patient circuit; an exhalation control module configured to operate the exhalation valve; and a bias valve connected between the blower assembly and the patient circuit, wherein the bias valve is configured to provide a bias pressure to the exhalation control module. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A bias valve apparatus for use with a gas source producing a gas flow and a flow-receiving device fluidly connected to and located downstream of the bias valve apparatus, comprising:
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a gas-receiving end and a gas-excreting end; a valve seat that receives fluid flow from the gas source at the gas receiving end of the bias valve apparatus; a poppet engageable to the valve seat wherein the poppet alternates between closed and open positions for respectively preventing and allowing gas to flow out of the bias valve apparatus; and a spring configured to bias the poppet against the valve seat such that an elevated drive pressure is provided at the gas-receiving end of the bias valve apparatus relative to a downstream pressure of the flow-receiving device. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A ventilator apparatus comprising:
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a blower assembly producing a gas flow; an exhalation control module; an exhalation valve connected to the patient circuit; a patient circuit, wherein the exhalation control module is configured to operate the exhalation valve; and a bias valve comprising; a valve seat connected to the blower assembly; a poppet engageable to the valve seat, wherein the poppet alternates between closed and open positions for respectively preventing and allowing gas to flow from the blower assembly to the patient circuit; and a spring configured to bias the poppet against the valve seat such that a bias pressure is provided at the exhalation control module for regulation of the exhalation valve, wherein the exhalation control module is fluidly connected to one side of the bias valve and the patient circuit is fluidly connected to an opposite side thereof.
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Specification