圧力センサ及び造影画像に基づく瞬時血流予備量比の計算方法

Japanese Patent JP7212970

B2

Disclosed is a method for calculating an instantaneous wave-free ratio based on a pressure sensor and angiogram images, comprising: acquiring pressures at the coronary artery ostium of heart by a blood pressure sensor in real-time, and storing the pressure values in a data linked table, and the data linked table being indexed by time and the time and real-time pressure being saved in the form of key-value pairs; finding out corresponding datas from the data queue based on time index using the angiography time as an index value, taking an average value of four wave-free pressure values as a wave-free pressure value Pa; obtaining a time Tn of an end phase of a diastolic period, namely of a wave-free period within one cycle according to the time index within the cycle; obtaining a length L of a segment of a blood vessel through angiogram images of two body positions, and obtaining a blood flow velocity V; calculating a pressure drop ΔP and calculating a pressure Pd which at the distal end of the blood vessel as Pd=Pa-ΔP, and further obtaining the instantaneous wave-free ratio. The present disclosure can accurately obtain the pressure value and the blood flow velocity within one cardiac cycle, greatly improving the accuracy of iFR.

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Fo, Infay
Riu, Kwanzi
Wu, Shin Yun

JP2021547747A

January 26, 2023

May 13, 2019

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Sucho Rainmed Medical Technology Company Limited

A61B5/0215; A61B5/029

JP2015527901A
JP2018534019A
JP2018535816A
JP2018533381A
JP2018500982A
JP2018089364A

Patent Attorney Corporation Asahina Patent Office

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