Patent ID: 11911550
Assignee: TERUMO KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC A  G  H | IPC A  H

Claim 10:
11. A method of detecting blood pressure in an elastically-deformable tube conveying pumped blood in an extracorporeal circulator, comprising the steps of:
capturing a portion of the elastically-deformable tube in a pressure measuring device having a main body portion adapted to detachably and movably mount onto the tube, a polarizer disposed in the main body portion so that light oscillating in a predetermined direction passes therethrough, and an image acquisition unit disposed in the main body portion to acquire image information of a pressure receiver body through the polarizer, wherein the pressure receiver body is arranged to deform according to a pressure of the pumped blood;
pumping the blood through the elastically-deformable tube;
capturing image information of the pressure receiver body through the polarizer as the pressure receiver body is deformed; and
comparing the image information acquired by the image acquisition unit with stored reference image information to determine the blood pressure, wherein the reference image information defines a relationship between deformation represented by the reference image information and corresponding pressure information.