Method and device for estimating air resistant and compliance

• Main Authors: ZHANG KAIJUN, TANG CHAOGEN, LI ZENG, WU HAIBO
• Format: Patent
• Language: English
• Published: 25.11.2015
• Subjects: DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEDICAL OR VETERINARY SCIENCE; SURGERY

The invention relates to a method for estimating air resistant and compliance. The method includes: acquiring in real time a pressure value of a respiratory circuit and a flow speed value thereof; estimating a pressure value in a control period using the acquired pressure value and a first formula; estimating a flow speed value in the control period using the acquired flow speed value and a second formula; using the pressure value in the control period as an output value of a transfer function of a respiratory mechanics model, using the flow speed value in the control period as an input value of the transfer function, and estimating a coefficient of the transfer function; calculating air resistance and compliance of the respiratory circuit according to the coefficient of the transfer function. By using the method, the problem that the flow speed in a sampling period is inconstant due to sensor precision limitations can be solved, and influence caused by mutual interference between decreased flow speed lag and flow speed can be overcome, the air resistance and compliance can be precisely estimated, and effective increase in accuracy of pressure controlled ventilation is guaranteed. In addition, the invention further provides a device for estimating the air resistance and compliance.