Pre-injection type infusion pump

Abstract

The invention provides a pre-injection type infusion pump which can precisely control the flux and flowing speed of an infusion apparatus. The infusion pump consists of a pump body, a pre-injection device and a driving mechanism; a driving pump wheel, a driven pump wheel, a ring-shaped belt (chain), a pressure injection roller, a supporting roller and a supporting track are arranged at one side of a mounting bracket of the pump body of an infusion pipe; and the oppositeness of the infusion pipe is provided with a pad plate and a pad plate elastomer. A locking pipe piece, a pre-injection mechanism shell, a pre-injection sliding block and a pre-injection cam are arranged above the driven pump wheel at one side of the mounting bracket of the pump body; the output end of a driving motor is provided with a reducing mechanism, the output end of which is provided with a transmission shaft which is provided with the pre-injection cam and a driving bevel gear; a driven bevel gear is coaxially connected with the driving gear; the driven gear is coaxially connected with the driving pump wheel which drives the ring-shaped belt (chain) to motion, thus driving the pressure injection roller to realize the pumping out function of the liquid; furthermore, the pre-injection device can compensate the elastic recovery quantity of the infusion pipe after rolling by coordinating with the pump body, thus ensuring constant output flux of the infusion pump. The pre-injection typed infusion pump has no special requirements on disposable infusion apparatus.

Description

technical field [0001] The invention relates to medical equipment, in particular to a pre-infusion infusion pump. technical background [0002] The currently used infusion pumps mainly have the following problems: (1) In a pumping cycle, the output flow is not constant; (2) The pumping flow of each pumping cycle is not constant; (3) Environmental factors and actual conditions are not considered. Compensate for flow fluctuations caused by conditional factors. The main reason is that the generally used finger-type peristaltic pump can realize the continuous output of liquid during the wave-like peristaltic downward process of the finger-type pump blades, but when the bottom finger-type pump blade of the pump reaches the uppermost finger-type pump The lack of pumping flow in the process of taking over the slices causes the fluctuation of the pumping flow, especially in the case of medium and small flow infusion, the situation of intermittent infusion is more obvious, and it is...

AI Technical Summary

Problems solved by technology

[0002] The currently used infusion pumps mainly have the following problems: (1) In a pumping cycle, the output flow is not constant; (2) The pumping flow of each pumping cycle is not constant; (3) Environmental factors and actual conditions are not considered. Compensate for flow fluctuations caused by conditional factors

The main reason is that the generally used finger-type peristaltic pump can realize the continuous output of liquid during the wave-like peristaltic downward process of the finger-type pump blades, but when the bottom finger-type pump blade of the pump reaches the uppermost finger-type pump The lack of pumping flow in the process of taking over the slices causes the fluctuation of the pumping flow, especially in the case of medium and small flow infusion, the situation of intermittent infusion is more obvious, and it is impossible to achieve a constant pumping flow within a cycle, which is difficult to meet High-precision infusion requirements

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 precision of the infusion tubes cannot meet the requirements of the infusion pump for squeezing the tubes and completely elastically restoring them to their original shape. It is required that the tube cannot return to its original shape after being squeezed for a certain number of times, 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 domestic ordinary 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. Change, in the case of no compensation, it is difficult to eliminate the error of the pumping flow of the infusion pump with the temperature change, which affects the infusion accuracy of the infusion pump

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