# Development of a Non-Contact Flow Sensor Based on a Permanent Magnet Metal Clip for Monitoring Circulation Status

## TL;DR

A non-contact sensor using Lorentz force is developed to monitor liquid flow during medical procedures, offering real-time detection and reusability.

## Contribution

A reusable, non-invasive sensor design for monitoring peritoneal puncture status using Lorentz force and a permanent magnet clip.

## Key findings

- The sensor generated an average voltage of 11.07 μV when liquid was present, indicating flow detection capability.
- The clip design allows for easy attachment and detachment from the drainage tube, enabling reuse.
- Finite element analysis confirmed the sensor's performance for real-time monitoring of peritoneal puncture.

## Abstract

Foreign matter accumulating on catheters during ascites paracentesis in cancer patients can interfere with the procedure. The paracentesis site must be visually inspected by patients or medical staff. We propose a monitoring method using sensors, as they enable real-time, automatic status detection. The proposed design integrates a sensor into the drainage tube to detect liquid flow using the Lorentz force. The sensor consists of a permanent magnet, a yoke, and a signal processing circuit. Mu-metal shields the magnet to prevent interference with surrounding circuits. Physiological saline solution is used as a substitute for bodily fluids. Sensor performance was evaluated via finite element analysis. The Lorentz force generated an average voltage of 11.07 μV when liquid was present, enabling detection of the flow status. The proposed sensor is non-invasive and features a clip design, allowing attachment and detachment from the drainage tube for reuse. Non-invasiveness ensures safety from infection, and reusability can reduce medical costs. This study proposes a sensor for monitoring peritoneal puncture status. By detecting liquid flow using the Lorentz force, the system enables real-time monitoring during the procedure.