Abstract
Flexible electronic devices are developing rapidly, especially in medical applications. This paper reports an arrayed flexible piezoelectric micromachined ultrasonic transducer (FPMUT) with a sandwich structure for adjuvant treatment of bone injury. To make the device conformable and stretchable for attaching to the skin surface, the flexible substrate of polydimethylsiloxane (PDMS) was combined with the flexible metal line interconnection between the bulk lead zirconate titanate (PZT) arrays. Simulations and experiments were carried out to verify the resonant frequency and tensile property of the reported FPMUT device. The device had a resonant frequency of 321.15 KHz and a maximum sound pressure level (SPL) of 180.19 dB at the distance of 5 cm in water. In addition, detailed experiments were carried out to test its acoustic performance with different pork tissues, and the results indicated good ultrasound penetration. These findings confirm that the FPMUT shows unique advantages for adjuvant treatment of bone injury.
Highlights
Ultrasound is widely used in the field of medicine, especially in elderly rehabilitation [1,2,3], because of its excellent mechanical effects
The total width of the flexible the two piezoelectric ceramics was 3.25 mm, and the maximum displacement set in the simulation was electrode between the two piezoelectric ceramics was 3.25 mm, and the maximum displacement set
The resonant frequency measured by an impedance analyzer was 321.15 KHz, and it was different from the data measured in air
Summary
Ultrasound is widely used in the field of medicine, especially in elderly rehabilitation [1,2,3], because of its excellent mechanical effects. This includes kidney stone lithotripsy with ultrasonic diagnostic technology and noninvasive tumor therapy with high-intensity focused ultrasound (HIFU) [4,5,6,7,8,9,10]. Recent research on the effect of ultrasound on chondrocyte proliferation and matrix production of human articular cartilage has shown the potential of low-intensity pulsed ultrasound (LIPU) for adjuvant treatment of bone injury [11,12]. The reported ultrasound transducers are both uncomfortable and inconvenient for long-term adjuvant treatment of bone injury
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