Design and Performance Assessment of Biocompatible Capacitive Pressure Sensors with Circular and Square Geometries...

Area of Science:

• Biomedical Engineering
• Materials Science
• Sensor Technology

Background:

• Accurate blood pressure monitoring is crucial for diagnosing and managing cardiovascular diseases.
• Existing methods for blood pressure measurement have limitations, necessitating the development of novel sensor technologies.
• Biocompatible materials are essential for implantable or wearable medical devices.

Purpose of the Study:

• To design and simulate capacitive pressure sensors using biocompatible materials.
• To evaluate the sensitivity and linearity of different sensor configurations for blood pressure measurement.
• To assess the potential of resonant frequency shifts for real-time arterial blood pressure tracking.

Main Methods:

• Fabrication of capacitive pressure sensors with circular and square geometries using biocompatible materials.
• Simulation of sensor performance using ANSYS Workbench.
• Investigation of the relationship between resonant frequency shifts and arterial blood pressure.
• Measurement of cobalt-chromium stent inductance using an impedance analyzer.

Main Results:

• A circular capacitive pressure sensor with two crescent-shaped slots and a 20 µm PDMS dielectric layer exhibited the highest sensitivity (10.68 fF/mmHg).
• An exceptionally linear response was observed between resonant frequency shifts and arterial blood pressure (Pearson's r = -0.99986, R² = 0.99972).
• The sensor demonstrated high precision for blood pressure measurements.

Conclusions:

• The designed capacitive pressure sensor shows significant promise for accurate and reliable blood pressure monitoring.
• The high linearity and sensitivity confirm its applicability in medical diagnostic tools.
• Further research may explore in-vivo performance and integration with other medical devices.