Patent ID: 7975691

Claim:
A CPAP (continuous positive airway pressure) device comprising: an air stream generator for generating positive pressure; a face mask connected to the air stream generator through a flow supply catheter; a pressure sensor measuring pressure in the face mask; a control circuit controlling the air stream generator; and a pressure detection pipe having a first side and a second side, the first side being installed such that a detection hole is located at a connection portion between the face mask and the flow supply catheter in order to directly measure pressure in the face mask, and the second side being connected to the pressure sensor through a through hole formed in the flow supply catheter, wherein the pressure sensor is connected to the second side of the pressure detection pipe to measure pressure of the detection hole formed at the first side of the pressure detection pipe and outputs the measured pressure value to the control circuit, the control circuit distinguishes average positive pressure from pressure caused by spontaneous breathing of patient according to values of the pressure in the face mask, which are input from the pressure sensor, and controls a speed of the air stream generator such that preset positive pressure is supplied to the patient, and the air stream generator generates air stream such that the pressure in the face mask maintains proper positive pressure under a control of the control circuit.