Pulmonary pressure and volume measurement

Claim 1

Device for determining static mechanical properties of a paralyzed patient's lung comprising pump means communicating with a paralyzed patient's lung to feed to and withdraw from the patient's lung a predetermined gas volume; pressure sensor means connected to said pump means for sensing the gas pressure in the lung; data processing means for processing the volume and pressure data to result in a continuous generation of volume pressure ratio data for determining static mechanical properties of the paralyzed patient's lung; and control means for controlling the pump means.

Claim 6

A method of determining the mechanical properties of a lung of a paralyzed patient comprising feeding a predetermined gas volume into the lung thereby inflating the lung and thereafter releasing the gas volume, thereby deflating the lung measuring the pressure changes generated in the lung during inflation and deflation so as to obtain data transforming the volume and the measured pressure data into digital form calculating typical or clinically significant volume to pressure ratios, and displaying the result of the calculation.

Claim 7

A method of determining the mechanical properties of a lung of a paralyzed patient comprising feeding a predetermined gas volume into the lung thereby inflating the lung and thereafter releasing the gas volume, thereby deflating the lung measuring the pressure changes generated in the lung during inflation and deflation so as to obtain data transforming the volume and the measured pressure data into digital form calculating typical or clinically significant volume to pressure ratios, and displaying the result of the calculation.

Claim 9

A method of determining the mechanical properties of a paralyzed patient's lung using a pump means having a piston within a cylinder with a predetermined displacement, comprising feeding a predetermined gas volume into the lung thereby inflating the lung and thereafter releasing the gas volume, thereby deflating the lung measuring the pressure changes generated in the lung during inflation and deflation so as to obtain data correcting a volume data according to a formula V.sub.eff =V.sub.step ±0.116V.sub.step -V.sub.comp ·(T/60) wherein V eff is the corrected or compensated volume, V step is the volume displaced by the piston based on the cylinder and piston geometry, V comp is a volume which compensates for the net oxygen loss (CO 2 generation taken in consideration), T is cycle time in seconds calculating typical or clinically significant volume to pressure ratios, and displaying the result of the calculation.

Claim 10

A method of determining the mechanical properties of a paralyzed patient's lung using a pump means having a piston within a cylinder with a predetermined displacement, comprising feeding a predetermined gas volume into the lung thereby inflating the lung and thereafter releasing the gas volume, thereby deflating the lung measuring the pressure changes generated in the lung during inflation and deflation so as to obtain data correcting a volume data according to a formula V.sub.eff =V.sub.step ±0.116V.sub.step -V.sub.comp ·(T/60) wherein V eff is the corrected or compensated volume, V step is the volume displaced by the piston based on the cylinder and piston geometry, V comp is a volume which compensates for the net oxygen loss (CO 2 generation taken in consideration), T is cycle time in seconds calculating typical or clinically significant volume to pressure ratios, and displaying the result of the calculation.