What is conductivity in a hemodialysis machine？
Definition of conductivity in hemodialysis machine:
Conductivity in a hemodialysis machine serves as an indicator of a dialysis solution's electrical conductivity, which indirectly reflects its electrolyte concentration. When conductivity inside the hemodialysis machine exceeds standard levels, it leads to sodium accumulation in the solution, potentially causing hypernatremia and intracellular dehydration in patients. Conversely, when conductivity in the hemodialysis machine falls below normal ranges, it triggers hyponatremia, manifesting as headaches, nausea, chest tightness, low blood pressure, hemolysis, and in severe cases, convulsions, coma, or even fatal outcomes.The hemodialysis machine uses Conductivity sensors continuously monitor the solution's parameters. If readings deviate from preset thresholds, abnormal solutions are automatically discharged through a bypass valve in the hemodialysis machine.
The hemodialysis machine relies on Conductivity sensors operate on this principle by measuring a solution's conductivity to indirectly determine its electrical properties. When the hemodialysis machine is immersed in a solution, ions migrate directionally under an electric field, generating a current. By detecting the current's strength and combining it with known parameters like electrode constants, the hemodialysis machine calculates the solution's conductivity.
The conductivity of dialysis fluid in the hemodialysis machine is determined by the concentrations of various ions including sodium, potassium, calcium, chloride, and magnesium in the solution. Standard hemodialysis machines utilizing carbonate dialysis typically incorporate 2-3 conductivity monitoring modules. These modules first measure the concentration of the A solution, then selectively introduce B solution only when the A solution meets the required concentration. The detected conductivity values in the hemodialysis machine are transmitted to the CPU circuit, where they are compared with preset parameters. This comparison enables precise control of the concentrate preparation system inside the hemodialysis machine, ensuring the dialysis fluid meets all required specifications.
The importance of conductivity in a hemodialysis machine:
The accuracy and stability of dialysate concentration within the hemodialysis machine is the guarantee for patients to achieve adequate dialysis treatment. For the appropriate concentration of dialysate in hemodialysis machine, the method of continuous monitoring of its conductivity is commonly used to control.
Conductivity represents the ability of a measured object to conduct electricity, representing the sum of various ions.
According to the preset value of electrical conductivity, the clinical hemodialysis machine extracts A and B solutions in a certain proportion, adds a quantitative amount of reverse osmosis water into the hemodialysis machine, and mixes them into dialysis fluid. Then the electrical conductivity sensor inside the hemodialysis machine is used to monitor and feedback information.
If the fluid inside the hemodialysis machine is transported to the dialyzer within the set range, if it exceeds the set range, it will not pass through the dialyzer, but be discharged through the bypass system of the hemodialysis machine, while and an alarm signal will be issued.
The accuracy of electrical conductivity is directly related to the treatment effect and life safety of patients.
If the conductivity is too high, the patient will cause high blood pressure due to the high concentration of sodium ions, resulting in hypernatremia, resulting in intracellular dehydration of patients, thirst, dizziness and other symptoms, and coma in severe cases;
On the contrary, if the conductivity of dialysate is too low, the patient will suffer from hypotension caused by low sodium, nausea, vomiting, headache, acute hemolysis, dyspnea and other symptoms, and in severe cases, convulsions, coma and even death may occur.
Conductivity in Chengdu Wesley’s hemodialysis machine:
Dual conductivity and temperature safety monitoring, conductivity is divided into conductivity 1 and conductivity 2, temperature is divided into temperature 1 and temperature 2, the dual monitoring system more comprehensively ensures the safety of dialysis
Conductivity Alarm fault handling in the hemodialysis machine:
|
Possible cause of failure |
Processing step |
| 1.Caused by no liquid A or liquid B | 1.Stable after 10 minutes in liquid A or liquid B |
| 2.The filter of liquid A or liquid B blocked | 2.Clean or replace filter of liquid A or liquid B |
| 3.Abnormal waterway condition of device | 3.Confirm that there is no foreign body plugging at the small hole and confirmconsistent inflow. |
| 4.Air entering | 4.Make sure if there are air entering into liquid A/B pipe |
Post time: Aug-19-2025
