An abdominal cavity gas detection device based on low concentration sensing and one-way microfluid channel

Abstract

This invention belongs to the technical field of medical devices and discloses a peritoneal gas detection device based on low-concentration sensing and a unidirectional microfluidic channel, solving the technical problem of low detection accuracy in existing peritoneal free gas detection devices. The device includes a separation component, one end of which is connected to the drainage tube of a postoperative patient for gas-liquid separation of the drainage material; a unidirectional flow channel module, one end of which is connected to the separation component for unidirectional transmission of the separated gas, the unidirectional flow channel module having asymmetric flow resistance characteristics; and a detection module, disposed on the unidirectional flow channel module, for detecting characteristic gas components and their corresponding concentrations in the gas. Therefore, by using the unidirectional flow channel module with its asymmetric flow channel, and utilizing fluid dynamics characteristics, the flow resistance is extremely low during forward flow and increases sharply in the reverse direction due to eddy currents. This effectively blocks the backflow of external air and drainage bag exhaust gas without additional mechanical power, avoiding sample dilution and contamination, thereby improving detection accuracy.

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