Dialysate Fluid Flow Control System in Balancing Chamber in Ultrafiltration Process in Hemodialysis

The Indonesian Renal Registry (IRR) states that in 2015 there were 30,554 active dialysis patients with Chronic Kidney Disease (CKD) which is a failure of kidney function to maintain metabolism, fluid and electrolyte balance. In the dialysis process, there is a necessary process called ultrafiltration which uses negative pressure dialysate, which is regulated by using a pump to control the flow rate of the dialysate. This study aimed to develop a method of controlling the flow of dialysate fluid in the ultrafiltration process on a hemodialysis machine. A fuzzy logic controller is used in the system to control the pump based on the flow sensor feedback, and there is also a valve opening and closing mechanism in the chamber using a timer that is adjusted every cycle. The results of a dialysate flow control system using fuzzy logic controller as a pump controller produce an oscillating flow rate at the set point and following the desired range between 300 - 600ml/min, with an error of 2.4%. Moreover, the opening and closing valve mechanism has an accuracy rate of time to work for one cycle with the average Error of 2.075%.