Abstract
For the needs of bladder urinary volume noninvasive monitoring in clinical, we present a noninvasive bladder urinary volume monitoring system based on bio-impedance. The system uses a four-electrode structure,which is composed of a pair of excitation electrodes and a pair of measurement electrodes. The Direct Digital Frequency Synthesis (DDS) is applied to generate a 50 kHz sine current excitation source. The impedance information extracted from phase sensibility demodulation technology is transferred to a computer through Zigbee wireless technology for real-time monitoring. Two experiments are taken to verify the accuracy and feasibility of the system. The experiments results show that the system can accurately measure the corresponding electrical impedance change of the bladder. The system provides a new way to continuously and noninvasively monitor the bladder urinary volume of patients with bladder dysfunction.
Highlights
It is normal that bladder fullness causes an urge to void
For the needs of bladder urinary volume noninvasive monitoring in clinical, we present a noninvasive bladder urinary volume monitoring system based on bio-impedance
The study of Liao et al [9] has proved that bladder urinary volume can be measured by detecting the corresponding electrical impedance changes of bladder
Summary
It is normal that bladder fullness causes an urge to void. for some handicapped with spinal cord injury or some patients with urological disease, this sense will disappear, causing urinary tract infections and urinary reflux even lead to renal failure. In clinic, draining urine out by a catheter inserted in the bladder is the traditional method to solve this problem [1] This method is invasive and may cause urinary tract infection. Another way to deal with this problem is to measure bladder urinary volume by using ultrasound. The study of Liao et al [9] has proved that bladder urinary volume can be measured by detecting the corresponding electrical impedance changes of bladder. A noninvasive bladder urinary volume monitoring system based on bio-impedance has been implemented This system, uses a four-electrode structure and a 50 kHz sine current excitation source, measures the impedance information of bladder real-time with simple operation.
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