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System and method for monitoring composition in a sidestream system using a disposable sampling chamber

  • US 10,094,810 B2
  • Filed: 11/02/2012
  • Issued: 10/09/2018
  • Est. Priority Date: 11/07/2011
  • Status: Active Grant
First Claim
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1. A detector device configured to measure composition of a flow of breathable gas received from a respiratory circuit, the detector device comprising:

  • a housing;

    a removable flow path element forming an enclosed flow path for the flow of breathable gas, the removable flow path element comprising an inlet, a sampling chamber, a pump section including a membrane and an actuator interface coupled to the membrane, and an outlet, wherein the inlet and the outlet of the removable flow path element are positioned on adjacent sides of the housing;

    a flow path element dock formed by the housing, the flow path element dock being configured to removably engage the removable flow path element;

    a radiation source housed within the housing configured to emit electromagnetic radiation into the sampling chamber of the removable flow path element while the removable flow path element is docked in the flow path element dock;

    a sensor assembly housed within the housing configured such that, while the removable flow path element is docked in the flow path element dock and the radiation source emits electromagnetic radiation into the sampling chamber of the removable flow path element, the sensor assembly receives electromagnetic radiation that has been emitted by the radiation source and has passed through the flow path formed in the removable flow path element, the sensor assembly being further configured to generate an output signal conveying information related to one or more parameters of the received electromagnetic radiation for determining the composition of the breathable gas in the enclosed flow path;

    a pump actuator carried by the housing in a separate portion from the removable flow path element and driven by a pump, the pump actuator being configured to move the membrane in the pump section of the removable flow path element by moving the actuator interface to draw the flow of breathable gas through the enclosed flow path;

    a pressure sensor that contacts the membrane and is configured to measure a flow rate of the flow of breathable gas; and

    a controller housed within the housing configured to control both;

    (i) the pump actuator to maintain the flow rate of the flow of breathable gas through the enclosed flow path; and

    (ii) power provided to the radiation source;

    wherein the housing comprises;

    a first section carrying the pump actuator and a pump motor, the removable flow path element being positioned on the first section; and

    a second section carrying the radiation source, the sensor assembly and the controller, and the second section being configured to pivot with respect to the first section and the removable flow path element.

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