Flow path sensing for flow therapy devices

By employing a continuous curved flow path and a combination of multiple sensors in the flow therapy device, the measurement anomaly caused by vortexes is solved, achieving high-precision and reliable gas flow measurement with redundancy and calibration functions.

CN114796784BActive Publication Date: 2026-06-26FISHER & PAYKEL HEALTHCARE LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FISHER & PAYKEL HEALTHCARE LTD
Filing Date
2016-12-02
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing flow therapy equipment suffers from vortex generation anomalies when measuring gas flow, affecting measurement accuracy and reliability, and lacks effective calibration and redundancy measures.

Method used

Employing a continuously curved flow path design, combined with an ultrasonic transducer and a heated temperature sensing element, it measures the gas flow rate, temperature, and humidity using gas concentration and pressure sensors for precise measurements. Furthermore, it enhances the accuracy and reliability of the measurements through a calibration system and redundancy measures.

Benefits of technology

It effectively reduces vortices in gas flow, improves the accuracy and reliability of flow measurement, provides redundancy and calibration mechanisms for flow measurement, and ensures high-precision operation of the equipment under different conditions.

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Abstract

Flow path sensing for flow therapy devices is provided that include a sensing chamber that measures the flow of gas provided to a patient. The sensing chamber can be located after a blower and / or a mixer. The sensing chamber can include an ultrasonic transducer, a temperature sensor, a heated temperature sensing element, and / or a gas concentration sensor. The gas flow path used in conjunction with the sensor system prevents the creation of unwanted vortices in the flow of gas that can create anomalies in the flow measurement.
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