Abstract:
PROBLEM TO BE SOLVED: To provide faster pressure rise time with increased reliability and less acoustic noise.SOLUTION: A multiple stage variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers (114, 115) in the gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. Thus, the multiple stage blower can provide faster pressure response and desired flow characteristics over a narrower range of motor speeds, resulting in greater reliability and less acoustic noise.
Abstract:
PROBLEM TO BE SOLVED: To provide a reliable air blower of which acoustic noise is low. SOLUTION: The double-ended variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers in a gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. The blower consists of a gas flow path between a gas inlet and a gas outlet, a motor, an impeller assembly which includes a shaft in communication with the motor for conducting rotary motion around a first axis and first and second impellers fixed to be immobile for the axis. Thus, the double-ended blower can provide faster pressure response and desired flow characteristics over a narrower range of motor speeds, resulting in greater reliability and less acoustic noise. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a blower having increased reliability and less acoustic noise.SOLUTION: A double-ended variable-speed system for continuous positive airway pressure (CPAP) ventilation of a patient includes two impellers, which cooperatively pressurize gas to the desired pressure and flow characteristics, in a gas flow path. The blower further includes the gas flow path between a gas inlet and a gas outlet, a motor, and an impeller assembly. The impeller assembly includes a shaft in communication with the motor for rotational motion about a first axis, and first and second impellers fixedly secured to the shaft. Accordingly, a double-ended blower can provide fast pressure response and desired flow characteristics over a narrow range of motor speeds, resulting in increased reliability with less acoustic noise.
Abstract:
PROBLEM TO BE SOLVED: To provide a pressure increase time quicker than ever before, with greater reliability and less acoustic noise. SOLUTION: A multiple stage variable speed blower for continuous positive airway pressure (CPAP) ventilation of patients includes two impellers (114, 115) in the gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. Thus, the multiple stage blower can provide faster pressure response and desired flow characteristics over a narrower range of motor speeds, resulting in greater reliability and less acoustic noise. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To monitor a parameter relating to sleep disordered breathing. SOLUTION: An air delivery system includes a controllable flow generator operable to generate a supply of pressurized breathable gas to be provided to a patient for treatment and a pulse oximeter configured to determine a measure of patient effort during a treatment period and provide a patient effort signal for input to control operation of the flow generator. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system and a method for detecting developing faults in a flow generator or a ventilator in use for a treatment. SOLUTION: A motor current is measured, and torque input by a motor is estimated, and output torque from an impeller is determined (for example, by looking up an estimation and/or reference table from a model from a motor control system). One or more of converters collect useful data for determining input and output torques. A difference between the input torque (to the motor) and the output torque (from the impeller) is calculated. This difference reduces noise by optionally using a low pass filter, and is compared with a predetermined threshold value once or over a predetermined time, and detects serious faults and/or developing faults. When the faults or the developing faults are detected, a user is warned and/or the flow generator becomes a " maintenance " mode. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
A control system (706) provides automated control of gas washout of a patient interface, such as a mask or nasal prongs. A gas washout vent assembly (60) of the system may include a variable exhaust area such as one defined by overlapping apertures of the assembly or a conduit having a variable gas passage channel. The vent assembly may be formed by nested structures, such as conic or cylindrical members, each having an opening of the overlapping apertures. The vent assembly may be attached substantially near or included with the patient interface. An actuator of the assembly, such as a solenoid or voice coil, manipulates an aperture of the vent assembly. The actuator may be configured for control by a controller to change the exhaust area of the vent assembly based on various methodologies including, for example, sleep detection, disordered breathing event detection, rebreathing volume calculation and/or leak detection.
Abstract:
Respiratory pressure treatment apparatus include automated methodologies for controlling changes to pressure in the presence of sleep disordered breathing events. In an example apparatus, various levels of expiratory pressure relief can provide different pressure reductions for patient comfort during expiration (333-A, 333-B, 333-C). The control parameters for these levels may be automatically modified based on the detection of an open airway. Similarly, in some embodiments, the levels may be automatically adjusted based on a detection of persistent obstruction. In still further embodiments, control parameters associated with a rise time of an early portion of an inspiratory pressure treatment may be automatically adjusted upon detection of flow limitation to permit a change to more aggressive waveforms from more comfortable waveforms for the treatment of sleep disordered breathing events.
Abstract:
PROBLEM TO BE SOLVED: To monitor parameters relevant to sleep disordered breathing.SOLUTION: An air delivery system includes: a controllable flow generator operable to generate supply of pressurized breathable gas to be provided to a patient for treatment and a pulse oximeter configured to determine a measure of patient effort during a treatment period and provide a patient effort signal for input to control operation of the flow generator.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and a method for detecting a defect that a flow generator or a ventilator may be deteriorated while being used for a medical treatment.SOLUTION: A motor current is measured, and a torque to be inputted by the motor is estimated so that an output torque from an impeller is determined (e.g., by an estimation from and/or a view of a reference table from the model of a motor control system). One or more converters collects the data which are useful for determining input and output torques. A difference between the input torque (to the motor) and the output torque (from the impeller) is calculated. This difference is reduced in noises by using a low-pass filter arbitrarily, and is compared once or over a predetermined time period with a predetermined threshold value so that a serious trouble and/or a deteriorated trouble are detected. If the trouble or the deteriorated trouble is detected, the user is warned, and/or a flow generator comes into the "reservation" mode.