Development of a fully implantable wireless pressure monitoring system

Abstract

A fully implantable wireless pressure sensor system was developed to monitor bladder pressures in vivo. The system comprises a small commercial pressure die connected via catheter to amplifying electronics, a microcontroller, wireless transmitter, battery, and a personal digital assistant (PDA) or computer to receive the wireless data. The sensor is fully implantable and transmits pressure data once every second with a pressure detection range of 1.5 psi gauge and a resolution of 0.02 psi. In vitro calibration measurements of the device showed a high degree of linearity and excellent temporal response. The implanted device performed continuously in vivo in several porcine studies lasting over 3 days. This system can be adapted for other pressure readings, as well as other vital sign measurements; it represents the first step in developing a ubiquitous sensing platform for telemedicine and remote patient monitoring.

A new catheterless urodynamics measurement method by using an intravesical capsule

“…The catheterless pressure measurement is generally of great interest for many medical applications such as intracranial pressure measurement [3] or real-time blood pressure measurement [4]. Some devices have been designed especially for the intravesical pressure measurement [5][6][7][8]. Implantable measurement systems have to be very small, so that the power supply is one of the most crucial topics.…”

Evaluation of sensitivity and linearity for touch-mode capacitive pressure sensor measuring the inner bladder pressure

“…7 Putting a pressure sensor inside urinary bladder can eliminate patients' discomfort and readily obtain the change in relationship between its pressure and volume. On top of that, this method can provide patients with visual information for more precise control at any time.…”

An embedded multichannel telemetry unit for bone strain monitoring

“…Several efforts to develop wireless sensing or telemetric devices for bone strain monitoring have been reported [7][8][9][10][11][12][13][14][15][16]. These efforts include the design of application specific integrated circuits (ASICs) [7,8] as well as solutions using commercially available electronic components [9][10][11][12][13][14][15][16].…”

“…These efforts include the design of application specific integrated circuits (ASICs) [7,8] as well as solutions using commercially available electronic components [9][10][11][12][13][14][15][16]. The small size of ASICs makes them an attractive solution for an implantable telemetry unit.…”