Semester of Graduation

Spring 2026

Degree

Master of Science in Mechanical Engineering (MSME)

Department

Department of Mechanical & Industrial Engineering

Document Type

Thesis

Abstract

Arteriovenous (AV) grafts are commonly used to provide vascular access for hemodialysis in patients with end-stage renal disease. Despite their widespread use, AV grafts are prone to complications such as stenosis and thrombosis. Early detection of these conditions remains challenging with current monitoring methods too costly or insufficient. This work presents the design, fabrication, and validation of an LC pressure sensor embedded within a model AV graft to enable real-time monitoring. The proposed system integrates a parallel-plate capacitive pressure sensor with a spiral inductor to form an LC circuit embedded within an elastomeric graft wall. The Ecoflex 00-30 dielectric layer compresses under internal pressure, increasing capacitance and decreasing resonant frequency. Wireless readout is achieved through inductive coupling using a Vector Network Analyzer and an external loop antenna. The graft structure was made using Dragon Skin 30 elastomer and compared to a commercial Gore Acuseal Vascular Graft using a biaxial mechanical testing setup to confirm validity of the material selection. Syringe pump experiments showed a consistent inverse relationship between pressure and resonant frequency and an average sensitivity of ~ 0.025 MHz/mmHg over the 75 to 180 mmHg range. Pulsatile pump testing further confirmed adequate dynamic response, as capacitance waveforms closely matched applied pressure oscillations under both normal and elevated peak pressures. Overall, the results demonstrate the feasibility of an LC sensor for passive wireless AV graft monitoring. This approach provides a foundation for future development toward continuous graft surveillance and earlier detection of access issues in hemodialysis patients.

Date

4-13-2026

Committee Chair

Herbert, Robert

LSU Acknowledgement

1

LSU Accessibility Acknowledgment

1

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