Design and Development of a Bladder Volume Determination Device Based on A-mode Ultrasound

Many older adults with Alzheimer's disease and patients with conditions such as spinal nerve injuries have symptoms of urinary incontinence. In order to improve their quality of life, B-mode ultrasound and drainage tubes are often used to measure the urine accumulation in the human bladder. In this paper, an ultrasonic urine system based on A-mode ultrasound is developed for measuring the urine accumulation in the human bladder. The ultrasound urine system contains three parts: the collection device, the mobile terminal, and the upper data processing software. In the collection device, the STM32 microcontroller sends out a pulse signal with a rate of 2.5MHz to excite the ultrasonic transducer through the ultrasonic transmitter circuit. Ultrasonic transducer receives the echo signals by the ultrasonic receiving circuit processing into digital signals, STM32 microcontroller transmits them to the mobile terminal. The mobile terminal transmits the digital signals to the upper data processing software for processing and receives the calculation results for display. We conducted tests on a bladder simulator. We conducted three sets of experiments and measured the transducer to baffle distance of 30mm, 40mm, and 50mm. The accuracy of the system measurements in three sets of experiments were 99.8%, 99.65%, and 99.52%. Experimental results verify the effectiveness of the system.