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Method for measuring fluid velocity and related apparatus

A measurement method and technology for measuring a body, which are applied in the directions of fluid velocity measurement, measurement device, blood flow measurement, etc., to achieve low-cost effects

Inactive Publication Date: 2012-02-15
医疗数据有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0043] However, this technique can only accurately detect the displacement or vibration of the target (pipe 25 in the figure), and the target must be arranged at right angles to the incident laser beam

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  • Method for measuring fluid velocity and related apparatus
  • Method for measuring fluid velocity and related apparatus
  • Method for measuring fluid velocity and related apparatus

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Embodiment Construction

[0073] The method according to the invention makes it possible to measure the average velocity V of the extracorporeal blood fluid or infusion fluid 50 by reverse injection interferometry. H . According to a general embodiment, the method comprises the following steps:

[0074] (a) preparing a conduit 48 comprising said fluid 50 flowing, said conduit 50 being part of an extracorporeal circuit 58 suitable for connection to a patient;

[0075] (b) emit the first laser beam 41 from the laser cavity 40 of the semiconductor laser source 60;

[0076] (c) directing said first laser beam 41 so as to be incident on said fluid 50;

[0077] (d) being reflected by the fluid 50 to generate a second laser beam 45, thereby causing interference with the first laser beam 41 in the laser cavity 40;

[0078] (e) detecting the interference signal via the monitor diode 46; and

[0079] (f) processing said detected interference signal by electronic processing and control circuit 100 .

[0080]...

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PUM

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Abstract

A method for measuring the mean velocity (VH) of an extracorporeal blood fluid or infusion fluid, by means of retroinjection interferometry, comprises the step of emitting a first laser light beam (41), from the laser cavity (40) of a semiconductor laser source (60), reflection of a second laser beam (45) by the fluid (50) and consequent generation of interference with the first laser beam (41) inside the laser cavity (40), detection of the interference signal by a monitoring photodiode (46), and processing, by means of an electronic processing and control circuit (100), of the interference signal detected. The invention also comprises an apparatus (62) for implementing the method described and an extracorporeal circuit (58) comprising said apparatus. The invention also comprises a method for replacing a laser source in said apparatus.

Description

technical field [0001] The invention relates to a method for measuring the velocity of a fluid, in particular an infusion fluid or blood flowing in an extracorporeal circulation circuit, as commonly used in the hygienic field, the following description is made with reference to this field of application only for the sake of simplicity its description. [0002] The invention also relates to a device for carrying out the method. [0003] Measuring fluid velocity is beneficial for obtaining other important measurements such as flow in pipes. Background technique [0004] Sensors without moving parts are known which utilize several physical parameters of the fluid, such as temperature and pressure reflected by acoustic waves or electric charge reflected by electromagnetic waves. [0005] In the biomedical field, where measurements must be performed without affecting the sterility of the fluid under test, the required sensors can either be sterilized and thus have low manufactu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/26A61B5/026A61M1/36
CPCA61M1/3663G01P5/26G01S17/58G01S7/4916
Inventor G·波罗R·波齐A·托里内斯M·莫尔贾L·罗瓦蒂
Owner 医疗数据有限公司