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Design and Simulation of an Integrated Wireless Capacitive Sensors Array for Measuring Ventricular Pressure
Natiely Hernández-Sebastián1, Daniela Díaz-Alonso2, Francisco Javier Renero-Carrillo3
1CD-MEMS INAOE, Puebla 72840, Mexico. natiely@inaoep.mx.
Sensors (Basel, Switzerland)
|August 29, 2018
Summary
This study presents a novel wireless touch mode capacitive pressure sensor (TMCPS) for continuous ventricular pressure monitoring. The system achieves a 5-300 mmHg range with high efficiency, offering a robust and low-cost implantable solution.
Area of Science:
- Biomedical Engineering
- Sensor Technology
- Medical Devices
Background:
- Continuous monitoring of ventricular pressure is crucial for managing cardiovascular conditions.
- Existing methods for ventricular pressure monitoring often involve invasive procedures or lack continuous, real-time data.
- A wireless, implantable sensor system offers a promising alternative for improved patient care.
Purpose of the Study:
- To report the novel design of a wireless touch mode capacitive pressure sensor (TMCPS) system.
- To enable full-range continuous monitoring of ventricular pressure.
- To develop a robust, low-cost, and technologically feasible implantable sensor.
Main Methods:
- Designed a TMCPS system with an implantable set and an external reading device.
- Utilized a dual-layer coil for a reliable resonant circuit and inductive coupling.
- Modeled the capacitive array for a 5-300 mmHg pressure range using small deflection regime.
- Calculated electromagnetic alignment for planar coils operating at 13.56 MHz through biological tissues.
- Validated the system using Comsol Multiphysics and CoventorWare simulations.
Main Results:
- Achieved a dynamic and full 5-300 mmHg pressure range.
- Demonstrated 90% power transmission efficiency at a 3.5 cm coil distance.
- Developed an implantable module using aluminum and polyimide for ergonomic, robust, and feasible sensors.
- The design is simplified, low-cost, and utilizes PolyMEMS INAOE technology with low-temperature processing.
Conclusions:
- The novel wireless TMCPS system provides a reliable method for continuous ventricular pressure monitoring.
- The implantable sensor is technologically feasible, robust, and cost-effective.
- This system has the potential to significantly improve the management of cardiovascular diseases.
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