A flow control method of peristaltic pump for blood purification

Abstract

The invention relates to a control method for flow of a blood purification peristaltic pump. The control method includes the steps that (1), a blood purification main system inputs a given blood flow value L'(t) into a flow controller; (2), revolving speed s(t) and pressure difference p(t) of the peristaltic pump are input into the flow controller; (3), a coefficient table is built through the flow controller; (4), a fuzzy controller calculates an output flow value L(t) of the peristaltic pump by reference to the coefficient table; (5), the flow controller performs error calculation on the L(t) and the L'(t) and judges whether an error is smaller than 0.1 or not, if yes, the step (7) is executed, and if not, the step (6) is executed; (6), a PI adjuster is used for adjusting the s(t), and the step (4) is executed; (7), the flow controller inputs a revolving speed signal of the peristaltic pump into the peristaltic pump and meanwhile sends the signal to the blood purification main system to be stored. Compared with the prior art, the control method for the flow of the blood purification peristaltic pump has the advantages of being easy to calculate, high in response speed, high in accuracy and the like and meanwhile can achieve predictive control over the main system and increase reliability of the system.

Description

technical field [0001] The invention relates to the field of blood purification, in particular to a flow control method of a blood purification peristaltic pump. Background technique [0002] The blood purifier is to draw the patient's blood out of the body, remove some pathogenic substances in it, and purify the blood to achieve the purpose of treating diseases. Because the flow rate of the peristaltic pump is a key data for system reference during the blood purification process, the flow controller of the peristaltic pump in the blood purification equipment is one of the key components. The flow measurement of the traditional peristaltic pump is determined according to the pressure difference between the inlet and outlet of the pump or the volume of the fluid flowing through the pump per unit time, so if the flow error of the peristaltic pump is 1ml / min, a system error of 60ml will be introduced in one hour , four hours of treatment time will introduce 240ml of error, whi...

AI Technical Summary

Problems solved by technology

The flow measurement of the traditional peristaltic pump is determined according to the pressure difference between the inlet and outlet of the pump or the volume of the fluid flowing through the pump per unit time, so if the flow error of the peristaltic pump is 1ml / min, a system error of 60ml will be introduced in one hour , the four-hour treatment time will introduce an error of 240ml, which will have an impact on the treatment requirements and effects

In addition, due to the aseptic requirements for the environment, any sensor cannot be in direct contact with the fluid, which brings great difficulties to the control system

Images