Mechanical ventilation system utilizing bias valve
First Claim
1. A bias valve apparatus for attenuating pulsating gas flow from a gas source to a flow-receiving device, the bias valve apparatus comprising:
- a housing assembly, comprising;
an annular housing chamber opening to a housing outlet fluidly connected to the flow-receiving device and to a housing inlet fluidly connected to the gas source; and
a housing having a housing sidewall and a housing end wall, the housing inlet being formed on an end opposite the housing end wall, the housing outlet being formed on the housing sidewall;
a hollow cylinder fixedly mounted within the housing assembly and having a cylinder end wall and a cylinder sidewall, the cylinder sidewall being disposed in spaced coaxial relation to the housing sidewall to define the housing chamber therebetween, the cylinder being open on an end coincident with the housing inlet; and
an annular valve seat fixedly mounted to the housing inlet and having a seat interface;
a poppet slid ably disposed within the cylinder and reciprocatively moveable therewithin,wherein;
the poppet includes a poppet side and opposing poppet ends;
a cylinder chamber is defined between the cylinder end wall and one of the poppetends, andthe other one of the poppet ends is configured to be sealingly engageable to the seat interface and defining a seat area; and
a spring having a spring preload sufficient to bias the poppet toward the seat interface; and
wherein the bias valve apparatus is used in conjunction with a ventilator having an exhalation control module fluidly connected to the bias valve apparatus;
wherein the gas source includes a Roots-type blower assembly and the flow-receiving device includes a patient circuit fluidly connected to an opposite side of the bias valve apparatus, andwherein the exhalation control module is configured to operate an exhalation valve connected to the patient 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.
319 Citations
10 Claims
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1. A bias valve apparatus for attenuating pulsating gas flow from a gas source to a flow-receiving device, the bias valve apparatus comprising:
a housing assembly, comprising; an annular housing chamber opening to a housing outlet fluidly connected to the flow-receiving device and to a housing inlet fluidly connected to the gas source; and a housing having a housing sidewall and a housing end wall, the housing inlet being formed on an end opposite the housing end wall, the housing outlet being formed on the housing sidewall; a hollow cylinder fixedly mounted within the housing assembly and having a cylinder end wall and a cylinder sidewall, the cylinder sidewall being disposed in spaced coaxial relation to the housing sidewall to define the housing chamber therebetween, the cylinder being open on an end coincident with the housing inlet; and an annular valve seat fixedly mounted to the housing inlet and having a seat interface;
a poppet slid ably disposed within the cylinder and reciprocatively moveable therewithin,wherein; the poppet includes a poppet side and opposing poppet ends; a cylinder chamber is defined between the cylinder end wall and one of the poppetends, and the other one of the poppet ends is configured to be sealingly engageable to the seat interface and defining a seat area; and a spring having a spring preload sufficient to bias the poppet toward the seat interface; and wherein the bias valve apparatus is used in conjunction with a ventilator having an exhalation control module fluidly connected to the bias valve apparatus; wherein the gas source includes a Roots-type blower assembly and the flow-receiving device includes a patient circuit fluidly connected to an opposite side of the bias valve apparatus, and wherein the exhalation control module is configured to operate an exhalation valve connected to the patient circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A ventilator, comprising:
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a blower assembly for producing a gas flow; an exhalation control module; a patient circuit, the exhalation control module being configured to operate an exhalation valve connected to the patient circuit; a bias valve comprising; a housing assembly comprising; an annular housing chamber that forms a housing outlet fluidly connected to the patient circuit and a housing inlet fluidly connected to the blower assembly; a housing comprising; a housing sidewall; and a housing end wall, wherein the housing inlet is formed on an end of the housing assembly opposite the housing end wall and is connected to the blower assembly, and wherein the housing outlet is formed on the housing sidewall;
a hollow cylinder fixedly mounted within the housing assembly and comprising;
a cylinder end wall; and
a cylinder sidewall,wherein the cylinder sidewall is disposed in spaced coaxial relation to the housing sidewall to define the housing chamber therebetween, and wherein the cylinder is open on an end coincident with the housing inlet; and an annular valve seat fixedly mounted to the housing inlet and having a seat interface; a poppet slidably disposed within the cylinder and reciprocatively moveable therewithin and comprising; a poppet side; and opposing poppet ends, wherein a cylinder chamber is defined between the cylinder end wall and one of the poppet ends, and wherein the other one of the poppet ends is configured to be sealingly engageable to the seat interface to define a seat area; and a biasing member having a spring preload sufficient to bias the poppet toward the seat interface, wherein the exhalation control module is fluidly connected to the bias valve and the patient circuit is fluidly connected to an opposite side thereof.
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Specification