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Updated: Feb 27, 2026

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

Kicheol Yoon1,2,3,4, Seung Hee Choi3, Tae-Hyeon Lee3

  • 1Gachon Biomedical Convergence Institute, Gachon University Gil Medical Center, Incheon 21565, Republic of Korea.

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|February 26, 2026
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Summary

This study introduces a novel sensor to monitor ascites paracentesis. The non-invasive device uses the Lorentz force to detect fluid flow in real-time, improving patient safety and reducing costs.

Keywords:
Lorentz forcemu-metalmultiple puncturesnon-contact flow sensorpermanent magnet

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Sensor Technology

Background:

  • Ascites paracentesis procedures can be complicated by foreign matter on catheters.
  • Current monitoring relies on visual inspection, which can be subjective and time-consuming.
  • Real-time, automatic status detection is needed to improve procedural safety and efficiency.

Purpose of the Study:

  • To develop and evaluate a novel sensor for real-time monitoring of peritoneal puncture status during ascites paracentesis.
  • To enable automatic detection of liquid flow, reducing reliance on visual inspection.
  • To create a non-invasive, reusable sensor to enhance patient safety and reduce medical costs.

Main Methods:

  • A sensor integrating a permanent magnet, yoke, and signal processing circuit was designed.
  • Mu-metal shielding was employed to prevent electromagnetic interference.
  • The sensor was tested using physiological saline solution, and its performance was evaluated via finite element analysis.

Main Results:

  • The sensor successfully detected liquid flow using the Lorentz force.
  • An average voltage of 11.07 μV was generated when fluid was present, indicating successful flow detection.
  • Finite element analysis confirmed the sensor's capability for real-time status monitoring.

Conclusions:

  • The proposed Lorentz force-based sensor provides a non-invasive and effective method for monitoring peritoneal puncture.
  • The clip design allows for easy attachment, detachment, and reuse, offering cost-effectiveness.
  • This technology has the potential to improve the safety and efficiency of ascites paracentesis in cancer patients.