Air passage block and end-expiratory carbon dioxide monitoring module manufactured by adopting same

Abstract

The invention relates to an air passage block and an end-expiratory carbon dioxide monitoring module manufactured by adopting the same. In the invention, an air outlet chamber communicated with a vacuum pump component and an air inlet chamber communicated with a carbon dioxide concentration measurement component are arranged in an air passage block body; the air outlet chamber is provided with anair hole communicated with the outside by two parts, the air inlet chamber is provided with an inner side air hole communicated with the outside by two parts respectively and an outer side air hole communicated with the outside by one part, and the outer side of the outer side air hole is also provided with a blind hole which is communicated with the outside by two parts and is not communicated with the air inlet chamber; and a connecting pipe used for generating pressure drop is arranged between the air outlet chamber and the air inlet chamber. As complicated pipeline connection is omitted, the pressure and the flow rate loss of gas expired by a patient is reduced when being transmitted in the monitoring module, and the measurement of carbon dioxide expired by the patient is more accurate. By arranging the connecting pipe used for generating pressure drop, a pressure difference is provided to measure the flow rate, and the whole structure and the installation are simplified. A pressure difference sensor adopts the connection of a flexible PCB plate and a main PCB plate, which obviously saves the space; the vibration damping performance of the vacuum pump component is reliable.

Description

technical field [0001] The invention relates to carbon dioxide monitoring, in particular to an air circuit block and an end-tidal carbon dioxide monitoring module made of the same. Background technique [0002] Partial pressure of end-tidal carbon dioxide (PETCO 2 ) can reflect the patient's metabolism, ventilation and circulation status, and is the sixth basic vital sign besides body temperature, respiration, pulse, blood pressure and arterial oxygen saturation. It is suitable for most people, can carry out carbon dioxide sampling and can accurately determine PETCO 2 The device includes a plug-in end-tidal carbon dioxide monitoring module. Most of these monitoring modules use a Venturi structure with a relative pressure sensor or a dedicated flow sensor to measure the end-tidal carbon dioxide flow. It generally includes a carbon dioxide concentration measurement assembly for measuring the patient's exhaled carbon dioxide concentration, a control PCB with an absolute pres...

AI Technical Summary

Problems solved by technology

Since the carbon dioxide concentration measurement components, absolute pressure sensor, relative pressure sensor and air pump are all connected by rubber hose, many rubber hose joints need to be designed, resulting in complex overall structure and large volume

Moreover, many rubber tubes that are difficult to connect increase the flow area of ​​the patient's exhaled gas, resulting in unnecessary pressure and flow loss, and causing large deviations in the measurement of carbon dioxide concentration, pressure and flow

In addition, most air pumps are directly fixed on metal blocks or PCBs with screws or cable ties, which increases vibration and noise, and the overall safety is poor.

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