×

Pressure control in CPAP treatment or assisted respiration

  • US 6,526,974 B1
  • Filed: 08/22/2000
  • Issued: 03/04/2003
  • Est. Priority Date: 09/18/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A controllable flow generator for supplying breathable pressurized gas, the flow generator comprising:

  • a housing with an inlet to receive the gas;

    a blower within the housing in communication with the inlet;

    a motor coupled to drive the blower, thereby pressurizing and providing the received gas to a passageway in communication with the housing; and

    a valving system in communication with the passageway, the valving system including a movable control member within the valving system, an entrance in communication with the passageway, an exiting port, and a vent positioned between the entrance and the exiting port in controlled gas communication with atmosphere, wherein in an inspiratory mode of operation, the movable control member is movable to increase an open area of the entrance while decreasing the open area of the vent, thereby controllably directing the gas introduced into the valving system via the entrance to a desired degree to the exiting port, and in an expiratory mode of operation, the movable control member is movable to increase the open area of the vent while decreasing the open area of the entrance, thereby controllably directing gas introduced into the valving system via the entrance and gas introduced into the valving system via the exiting port to a desired degree to the vent.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×