Injection finishing control method of syringe injection pump

Abstract

The invention discloses an injection finishing control method of a syringe injection pump. The method comprises the following steps that a computer control system is used for controlling the running of a stepping motor; the stepping motor drives a screw rod to rotate through a reduction gearbox; the rotation of the screw rod drives a screw rod nut to axially and linearly move so as to drive a power rod and a push rod to linearly move synchronously; each position in the moving procedure of the push rod corresponds to each displacement signal of a linear displacement sensor, the positions where the push rod is positioned when the injection of the syringe injection pump is finished and is to be finished are exactly defined in advance; and when the push rod moves to the defined positions, the computer control system gives an alarm and prompts. By the method disclosed by the invention, the alarming function when the injection of the injection pump is finished can be realized under different conditions; even though the tail part of a syringe is relatively small and the amount of the injection is less, the alarming function can also be realized when the injection is finished and is to be finished.

Description

technical field [0001] The invention relates to a medical device, in particular to a calibration device and a calibration method for the capacity scale of a syringe injection pump. Background technique [0002] At the end of the syringe injection pump, a stop signal needs to be fed back to the control system, so that the advancing mechanism of the syringe injection pump can run to a specific position. The control system sends a message that the injection is about to be completed or stops. In order to realize the shutdown control, it is necessary An injection completion identification device is arranged in the injector pump. [0003] At present, most of the control schemes for the completion of injection using syringe injection pumps are to set a position detection switch at the end position of the propulsion system operation, and the switch can be a Hall detection switch, a mechanical switch or a photoelectric switch. This solution is to set a switch point. When the propuls...

AI Technical Summary

Problems solved by technology

The position of the alarm point is generally taken near Lmax. When the tail size L of the syringe push rod used is small and the liquid volume is small, there may be a problem that the alarm has not been realized or the injection is about to be completed.

Images