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Method and system for dynamic compensation of bi-directional flow sensor during respiratory therapy

A flow sensor and dynamic compensation technology, applied in the field of life support solutions and clinical systems, can solve the problems of time-consuming and high cost, and difficult calibration of hot wire gas flow sensor

Inactive Publication Date: 2008-02-13
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requirement makes calibration of hot wire gas flow sensors difficult, time consuming, and costly when performing sense resistor replacement

Method used

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  • Method and system for dynamic compensation of bi-directional flow sensor during respiratory therapy
  • Method and system for dynamic compensation of bi-directional flow sensor during respiratory therapy
  • Method and system for dynamic compensation of bi-directional flow sensor during respiratory therapy

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Embodiment Construction

[0017] The structure and principle of operation of a simple bridge circuit of the type employed in the sensor of the present invention is described below with reference to FIG. 1 . The bridge circuit shown in Figure 1 is often referred to as a Wheatstone bridge. The bridge circuit 20 has input terminals A and C connected to a voltage source 22 and a pair of output terminals B and D which are connectable to an output indicating device 24 such as a galvanometer. Bridge arm 26 extends between output A and output B and includes a resistor 28 . Bridge arm 30 extends between output A and output D and includes a resistor 32 . Bridge arm 34 extends between output terminal B and input terminal C and includes resistor 36 . Bridge arm 38 extends between input C and output D and includes a resistor 40 .

[0018] The operation of the bridge circuit 20 is as follows. Assume that resistor 28 has a value of 100 ohms, resistor 36 has a value of 1,000 ohms, resistor 32 has a value of 300 oh...

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Abstract

The method and system includes a flow sensor including two hot wire gas flow sensing elements connected to identical, but independent electronic circuitry, positioned in parallel, transverse to gas flow direction, and separated by a post that serves to shadow the downstream element. The flow sensors are dynamically compensated during respiratory therapy by use of digital to analog conversion, which provides for more accurate identification of flow direction and more accurate gas flow in volume measurements. The method and system incorporates the flow sensors in the y-piece of a breathing circuit.

Description

technical field [0001] The present invention relates to the field of clinical systems. More particularly, the invention relates to the field of life support solutions. Background technique [0002] The present invention relates to gas flow sensors employing heated resistive wires, commonly referred to as hot wire anemometers. Many applications require the measurement of the flow rate of a gas or gas mixture. One such application is in medical instruments, such as respirators, to measure the respiratory flow rate of breathing gas exhaled by a subject. Measuring the flow rate of exhaled breathing gas is particularly difficult due to the wide range of instantaneous gas flow rates during exhalation, changes in the composition of the exhaled breathing gas, exhaled moisture and saliva in the breathing gas. [0003] Hot wire gas flow sensors, or anemometers, have been used as flow sensors for exhaled breathing gas in respirators and similar devices. In the simplest form of this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M16/00
CPCG01F1/72A61B5/0878G01F1/6842
Inventor D·A·克里斯滕森
Owner GENERAL ELECTRIC CO