Title:
BLOODLESS AORTIC BLOOD FLOW MEASURING INSTRUMENT AND METHOD THEREFOR
Document Type and Number:
Japanese Patent JP3192272
Kind Code:
B2
Abstract:
PURPOSE: To enable the bloodless measurement of the blood flow rate of the aorta at a low cost by determining the blood flow rate of the aorta in accordance with the blood pressure difference between the right and left subclavian arteries.
CONSTITUTION: The blood pressures of the right and left subclavian arteries are indirectly measured by tonometer type blood pressure sensors 24 mounted on the arteries of the two pectoral limbs 22, 22 of the patient 20. The signals from the respective blood pressure sensors 24 are processed by sensor control means 26, 26 and are outputted as a blood pressure signal 26a indicating the instantaneous blood pressure value within the radial arteries. The respective blood pressure signals 26a are subjected to equalization processing by equalizing devices 28, 28 and are outputted as equalization signals 28a. In succession, the DC deviation generated between the two blood pressure sensors 24 and 24 is removed by deviation correction devices 30, 30 and a blood pressure difference signal 32a is thereafter outputted via a differential amplifier 32. A pressure/flow rate conversion device 34 converts the blood pressure difference signal 32a indicating the blood pressure drop in the part of about 2cm of the aortic arch existing between the right and left subclavian arteries to the flow rate signal indicating the instantaneous flow rate per-cent of the blood of the part.
Inventors:
Joseph S. Ekar
Application Number:
JP11914593A
Publication Date:
July 23, 2001
Filing Date:
April 21, 1993
Export Citation:
Assignee:
Nippon Colin Co., Ltd.
International Classes:
A61B5/021; A61B5/026; (IPC1-7): A61B5/026
Domestic Patent References:
| JP1204644A | ||||
| JP6331637A | ||||
| JP3162827A | ||||
| JP56128142A | ||||
| JP4916277A | ||||
| JP6060835A | ||||
| JP26005U | ||||
| JP3703U |
Attorney, Agent or Firm:
Haruyuki Ikeda (2 outside)