Plunger piston type infusion pump

Abstract

The invention relates to a plunger-type infusion pump which can precisely control the flow quantity and the flow rate of an infusion set. The plunger-type infusion pump is composed of a pump body and a driving mechanism; an upper lock tube piece, an upper plunger group, a lower lock tube piece and a lower plunger are connected with an elastic body and parallelly arranged at the same side surface of a fixed frame of the pump body mechanism, a liner board which is connected with the elastic body is arranged at the opposite surface of the fixed frame, side sliding blocks which are connected with the elastic body are arranged at the two sides of the mechanism, and the four surfaces constitute a rectangular space. A small gear is arranged on the end part of a driving motor, a driving shaft is arranged at the position which is parallel to the side surface of the fixed frame, a big gear and a group of wheels with different distances from profile surfaces to the rotation center are arranged on the shaft, the profile surfaces of the group of the wheels are contacted with the back surfaces of the lock tube pieces and the plungers, thereby allowing various lock tube pieces and plungers to move to the direction of the liner board according to specific rules and further extruding the infusion tube to complete the output of the infusion pump. The plunger-type infusion pump can obtain higher precision of the flow quantity and the flow rate when being used with the disposable commonly used infusion set, thereby having no need of special infusion set and having cheap consumables.

Description

technical field [0001] The invention relates to medical equipment, in particular to a plunger type infusion pump. technical background [0002] The infusion pumps currently used mainly have the following problems: the use of finger-type peristaltic pumps cannot achieve constant pumping volume in one pump pressure cycle. Continuous output, but when the pump is replaced from the last finger pump to the uppermost finger pump, the pump output is lacking, resulting in fluctuations in the pump output, especially in the case of medium and small flow infusions, gap type The situation of infusion is more obvious, and it is difficult to meet the requirements of high-precision infusion. In view of the price, domestic infusion pumps generally do not use special infusion sets for infusion pumps, but ordinary disposable infusion sets produced in accordance with national standards. The elasticity and manufacturing accuracy of the infusion tubes cannot meet the requirements of the infusion...

AI Technical Summary

Problems solved by technology

[0002] The currently used infusion pumps mainly have the following problems: using finger-type peristaltic pumps, the pumping volume cannot be kept constant in one pump pressure cycle. Continuous output, but when the pump’s lowermost finger pump is replaced by the uppermost finger pump, the pump output is lacking, resulting in fluctuations in the pump output, especially in the case of medium and small flow infusions, gap type The situation of infusion is more obvious, and it is difficult to meet the requirements of high-precision infusion

In view of the price, domestic infusion pumps generally do not use special infusion sets for infusion pumps, but use ordinary disposable infusion sets produced in accordance with national standards. The elasticity and manufacturing accuracy of the infusion tubes cannot meet the requirements of the infusion pump for tube extrusion and complete elasticity. The requirement of restoring the original shape, after a certain number of squeezes, the tube cannot return to its original shape, so that after the infusion pump works for a period of time, the pumped flow will gradually decrease, resulting in a decrease in the accuracy of the infusion pump

The elasticity of ordinary domestic disposable infusion tubes changes with the temperature of the environment. When the finger pump leaves the infusion tube, the infusion tube recovers its original shape by its own elasticity, and the amount of liquid in the tube changes as the tube recovers its shape. Changes, resulting in the error of the pump output of the infusion pump changing with the temperature is difficult to eliminate, affecting the infusion accuracy of the infusion pump

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