Control method for flow of blood purification peristaltic pump

A blood purification and control method technology, applied in pump control, blood pump, machine/engine, etc., can solve the problems of treatment requirements and effect impact, direct contact of sensor fluid, difficult control system, etc., to achieve simplified calculation and response speed block, speed up the response effect

CN103520786AInactive Publication Date: 2014-01-22SHANGHAI UNIV OF ENG SCI +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-01-22
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as figure 1 As shown, a blood purification peristaltic pump flow control method is characterized in that it comprises the following steps:

[0033] (1) The blood purification main system inputs the given blood flow value L'(t) into the flow controller;

[0034] (2) The pump speed measurement unit detects the speed s(t) of the peristaltic pump, and the pressure difference measurement unit detects the pressure difference p(t) at both ends of the peristaltic pump tube, and inputs s(t) and p(t) to the flow controller middle;

[0035] (3) The flow controller constructs a coefficient table according to the linear equation of the output flow of the peristaltic pump;

[0036] (4) The fuzzy controller refers to the coefficient table, calculates the peristaltic pump output flow value L(t) under the current peristaltic pump speed s(t) and...