Cpap apparatus

Patent metadata

Field	Value
Publication number	US-2024082520-A1
Application number	US-202318510999-A
Country	US
Kind code	A1
Filing date	Nov 16, 2023
Priority date	Dec 20, 2017
Publication date	Mar 14, 2024
Grant date	—

Abstract

A CPAP apparatus according to the present disclosure includes a housing, a hose whose one end communicates with a connection portion, a fan configured to expel air flowing in from an intake port, from another end of the hose, a motor and a motor driving unit configured to rotationally drive the fan, a control unit configured to control the motor driving unit, and a flow rate sensor. The control unit includes a command generation unit configured to generate a command value of a rotation number of the fan such that a pressure to be expelled from the other end of the hose becomes a target pressure, and a command correction unit configured to correct the command value based on a flow rate value obtained by the flow rate sensor.

First claim

1 . A CPAP apparatus comprising:
a housing comprising an intake inlet and an exhaust outlet; an air passage comprising a first end connected to the exhaust outlet; a fan configured to expel air from a second end of the air passage, the air flowing into the CPAP apparatus at the intake inlet; a fan driver configured to rotationally drive the fan according to a rotational parameter; a processor configured to control the fan driver; a flow rate sensor configured to measure an air flow rate between the fan and the second end of the air passage; and a pressure sensor configured to measure a pressure of air between the fan and the second end of the air passage, wherein the processor is configured to:
determine a respiration disturbance correction value based on the measured air flow rate,
determine a pressure difference between the measured pressure and a target pressure, and a rotation number correction value based on the determined pressure difference, and
control the fan driver based on a weighted combination of the respiration disturbance correction value and the rotation number correction value, such that a pressure of air delivered to the air passage equals the target pressure.

2 . The CPAP apparatus according to claim 1 , further comprising:
memory configured to store information indicative of a relationship between a pressure of air and a flow rate of air generated by the fan.

3 . The CPAP apparatus according to claim 2 , wherein:
the stored information further relates the pressure of air and the flow rate of air generated by the fan to a corresponding rotational parameter, when the rotational parameter of the fan when the measured air flow rate is less than the rotational parameter of the fan stored in memory and related to the measured air flow rate at the target pressure, the controller is configured to control the fan driver such that the rotational parameter of the fan increases, and when the rotational parameter of the fan when the measured air flow rate is greater than the rotational parameter of the fan stored in memory and related to the measured air flow rate at the target pressure, the controller is configured to control the fan driver such that the rotational parameter of the fan decreases.

4 . The CPAP apparatus according to claim 1 , wherein:
when the measured pressure is less than the target pressure, the controller is configured to control the fan driver such that the rotational parameter of the fan increases, and when the measured pressure is greater than the target pressure, the controller is configured to control the fan driver such that the rotational parameter of the fan increases.

5 . The CPAP apparatus according to claim 1 , wherein the target pressure is a constant value for exhalation and inhalation of a patient.

Assignees

• Murata Manufacturing Co

Inventors

• Tsuji Shigeru
• Hayashi Takanori
• Wada Hiroaki

Classifications

• A61M16/024 Primary

  including calculation means, e.g. using a processor · CPC title

• A61M16/0003 Primary

  Accessories therefor, e.g. sensors, vibrators, negative pressure · CPC title

• A61M16/0066

  Blowers or centrifugal pumps · CPC title

• A61M2016/0027

  pressure meter · CPC title

• A61M2016/003

  with a flowmeter · CPC title