A Wireless Bladder Volume Monitoring System Based on Inductive Coupling

By utilizing the strong penetration characteristics of low- and mid-frequency signals, the wireless bladder volume monitoring system based on inductive coupling solves the problems of device size and power consumption limitations, difficulty in matching sensors with muscle tissue, and weak signal penetration ability in existing bladder volume monitoring technologies, thus achieving long-term, stable, and high-precision bladder volume monitoring.

CN121265059BActive Publication Date: 2026-05-26UNIV OF SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF SCI & TECH OF CHINA
Filing Date
2025-11-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing bladder volume monitoring technologies suffer from limitations in device size and power consumption, difficulties in matching sensor mechanical compliance with muscle tissue, weak signal penetration into deep tissues, and low signal-to-noise ratio, making it difficult to achieve long-term, stable, and high-precision bladder volume monitoring.

Method used

A wireless bladder volume monitoring system based on inductive coupling is adopted. Taking advantage of the strong penetration characteristics of low and medium frequency signals, the system detects changes in bladder volume through near-field coupling between a passive LC sensor unit and an external reading coil. The bladder volume is then inverted using an impedance measurement unit. The system does not require an internal power supply, and its flexible packaging provides good tissue compatibility.

Benefits of technology

It achieves long-term, stable, and high-precision bladder volume monitoring, has strong anti-interference capabilities, and the measurement results are not affected by changes in the relative pose of the sensor and the reading coil. It is suitable for long-term wear, has low cost, and long lifespan.

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Abstract

This invention provides a wireless bladder volume monitoring system based on inductive coupling, comprising a passive LC sensor unit attached close to the bladder, an external reading coil integrated into clothing or a belt, and a portable impedance measurement unit located in a clothing pocket. This system utilizes the strong penetrating power of low-to-medium frequency scanning signals to wirelessly monitor the state of the bladder through electromagnetic coupling between the passive LC sensor unit and the external reading coil, effectively overcoming the influence of relative pose changes between the passive LC sensor unit and the external reading coil on the measurement results. This invention obtains the system resonant frequency of the passive LC resonant unit by continuously detecting the impedance at the input terminal of the external reading coil, thereby realizing a wearable, wireless, passive, real-time bladder volume monitoring system. It features a simple structure, high reliability, and portability, making it suitable for long-term monitoring scenarios.
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