Pulmonary pressure and volume measurement

• US 4,844,085 A
• Filed: 11/14/1988
• Issued: 07/04/1989
• Est. Priority Date: 09/13/1985
• Status: Expired due to Fees

• Current Assignee: Luciano Gattinoni
• Original Assignee: Luciano Gattinoni
• Inventors: Gattinoni, Luciano
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US07/274,696
• Time in Patent Office: 232 Days
• Field of Search: 127/716, 127/720, 127/725
• US Class Current: 600/533
• CPC Class Codes: A61B 5/085 Measuring impedance of respiratory organs or lung elasticity
• CPC Class Codes: A61B 5/091 Measuring volume of inspired or expired gases, e.g. to determine lung capacity

Abstract

A method and a device for measuring mechanical property parameters of the pulmonary system of a patient which comprises;

inflating and deflating the lung with a predetermined gas volume with a pump;

measuring the pressure changes generated in the lung during inflation and deflation with a pressure sensor;

transforming the volume and the measured pressure data into digital form;

calculating typical or clinically significant volume to pressure ratios in a data processor and;

displaying the result of the calculation.

Claims

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.

2. Device according to claim 1, wherein the pump means contains a motor-driven piston pump which is adapted to be connected to the patient'"'"'s lung.

3. Device according to claim 1, wherein the data processing means contain a microprocessor and memory means for permanent storage of program data and for preliminary storage of input and output data.

4. Device according to claim 3 wherein the data processing means moreover contain display and indicating means.

5. 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.

6. Method according claim 5 wherein the inflating and deflating is effected stepwise with incremental volume changes.

7. 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

View Dependent Claims (8)

8. Method according to claim 7 wherein the inflating and deflating is effected stepwise with incremental volume changes.