Hemodialysis is recognized as the most effective treatment for patients suffering from acute and chronic renal failure of various etiologies. The dialysis machine functions to replicate the role of the human kidney by extracorporeally circulating the blood through a dialyzer, where solute exchange occurs via an extracorporeal circuit. This process facilitates the removal of metabolic waste products and excess fluid before returning the purified blood to the patient's venous system.
During dialysis treatment, the process cannot be interrupted and it is imperative to ensure that all operational indicators of the dialysis system remain within normal parameters to enhance clinical outcomes. Various sensors, including pressure and temperature sensors, play a critical role in maintaining the integrity and functionality of the dialysis system.
Pressure sensor monitors blood flow pressure
Accurately measuring dialysate and venous pressure is critical to patient safety during dialysis treatment. Currently, some micro pressure sensors, especially MEMS pressure sensors, are used in various fine fluid monitoring devices such as renal dialysis machines.
Application of pressure and temperature sensors in hemodialysis treatment
In this type of instrument, the main function of the pressure sensor is to accurately detect the flow pressure of fluid and blood to ensure that the pressure is maintained within the applicable range and to avoid overpressure or underpressure. Because both overpressure and underpressure will cause blood vessel rupture or bubbles in the pipeline, threatening the safety of patient treatment.
In practical applications, the best way to achieve more accuracy and faster response time is to place the sensing element as close as possible to the location where the liquid flows. At this time, using a pressure sensor with liquid media compatibility can reduce the complexity and cost loss associated with sensor protection design.
Temperature sensor for heating and temperature control of dialysate
In a hemodialysis machine, the normal temperature of the dialysate should be 36.5 to 37.5 degrees Celsius, and is generally set at 37 degrees Celsius. If the temperature is unbalanced, it will cause discomfort or even death to the patient. At this time, it is necessary to monitor the temperature of the dialysate. Usually, there are temperature indicators and thermistors in the dialysate loop of the dialyzer. They are used to monitor the temperature of the dialysate and keep it within a constant range.
In actual applications, in order to provide patients with fluids at the same temperature as body temperature and ensure patient safety, temperature management solutions are used in dialysis machines. By using temperature sensor components such as flexible heating sheets, blood and dialysate can be heated to human body temperature before being re-injected into the patient's body. In this process, the heating controller can accurately control the temperature of the dialysate.