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Flow Sensing for Gas Delivery to a Patient

  • US 20080216833A1
  • Filed: 02/29/2008
  • Published: 09/11/2008
  • Est. Priority Date: 03/07/2007
  • Status: Abandoned Application
First Claim
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1. A pressure support system that delivers a pressurized flow of breathable gas to an airway of a patient, the system comprising:

  • a pressure generator comprising an impeller and a motor, the motor being configured to generate a torque, the impeller being coupled to the motor such that at least a portion of the torque generated by the motor is provided to the impeller to drive the impeller to rotate through a body of breathable gas, wherein as the impeller rotates through the body of breathable gas the gas applies a torque to the impeller and the impeller applies a corresponding force to the body of breathable gas that generates a pressurized flow of breathable gas for delivery to a patient;

    a torque monitor configured to determine information related to the torque generated by the motor;

    a rotation monitor configured to determine information related to a rotational velocity of the impeller and/or the motor; and

    a processor configured to determine one or more parameters of the pressurized flow of breathable gas generated by the pressure generator based on the information determined by the torque monitor and the information determined by the rotation monitor, wherein the determination of the one or more parameters of the pressurized flow of breathable gas includes an adjustment for at least a portion of a difference between the torque generated by the motor and the torque that is applied to the impeller by the body of breathable gas.

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