A mini-invasive multi-function bladder urine pressure measurement system

A mini-invasive system for different purposes of the bladder urine pressure measurement is presented. Not only can the period of measurement be adjusted, the flexibility is also enhanced by using a variable IA (instrumentation amplifier). Because the urine pressure inside the bladder usually does not vary drastically, a long-term mode is required to save the battery power for a reliable observation. Besides, the pressure dynamics in a bladder also could be examined in the continuous mode. The IA amplifies the signal sensed by the pressure sensor, which is then fed into the following ADC (analog-to-digital converter). Owing to the intrinsic 1-atm pressure (one atmospheric pressure) existing inside the bladder and the various resolution requirement for the different applications, the input range of the IA must be able to be adjusted to keep the required linearity. The pressure range of the proposed system is found out to be 10.4 ~ 27.7 Psi with the maximum resolution of 6.75 x 10^-3, which covers the range of all of the known unusual bladder syndromes or complications.