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A Wireless Implantable Microsystem for Real-Time Bladder Volume Monitoring
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  • Soumyajit Mandal ,
  • Parisa Dehghanzadeh ,
  • Hossein Zamani ,
  • Sameer Shaik
Soumyajit Mandal
Brookhaven National Laboratory

Corresponding Author:[email protected]

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Parisa Dehghanzadeh
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Hossein Zamani
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Sameer Shaik
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Abstract

This paper describes an implantable wireless microsystem for making embedded ultrasound distance measurements and its applications in real-time bladder volume (BV) estimation. A tuned inductive link at 125 kHz is used for both power transfer and bidirectional data telemetry with the implanted unit. Implant power consumption is minimized by using a single-bit correlation receiver to estimate ultrasound time-of-flight (ToF) from A-mode data acquired by an on-board piezoelectric transducer. In vitro tests of the device (external diameter =30 mm including coil) in saline solution show a maximum operating depth of 3.2 cm from a 10 cm diameter external coil operated at +/-18 V. Wireless BV measurements using both spherical and non-spherical bladder phantoms show estimation errors < 15\% for volumes in the 50-300 mL range.