Working principle and structural design of the integrated piezoelectric puncture and sensing system (IMAGE)

Beijing Institute of Technology Press Co., Ltd

Working principle and structural design of the integrated piezoelectric puncture and sensing system

Caption

(A) Schematic comparison of the puncture process with and without axial vibration, including 3 stages: pre-puncture (contact compression), puncture (membrane rupture), and post-puncture (insertion into tissue). (B) Exploded view of the piezoelectric actuator–sensor integration, consisting of a substrate, an actuating PZT, and a sensing PZT, clamped together by a ring and coated with silver electrodes. (C1 and C2) Working mechanism of the piezoelectric sensor: (C1) under no external load, no voltage is generated; (C2) under external force while the actuator applies a sinusoidal voltage. (D) Signal flow and circuit design for vibration driving and force sensing. The upper loop represents the actuation path using a DAC and power amplifier, while the lower loop shows the sensing path using a charge amplifier, low-pass filter, and ADC for real-time acquisition of force signals.

Credit

Bingze He, Shanghai Jiao Tong University

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