Transmission structure of medical injection pump

Abstract

A transmission structure of a medical injection pump comprises a frame, a slider, a screw rod, a pair of guide rods and a push rod. The frame comprises a bottom plate and a pair of side plates. The side plates are fixedly arranged at two ends of the bottom plate and are perpendicular to the bottom plate. The slider is arranged on the bottom plate of the frame and is perpendicular to the bottom plate. A nut used for being spirally connected with the screw lead is arranged on the upper portion of the slider. A spring seat, a spring mounted on the spring seat and a shifting plate movably connected with the spring are arranged below the nut respectively. Two ends of the screw rod are rotationally connected to the inner side walls of the side plates of the frame respectively. The guide rods are parallelly and fixedly arranged on the inner side walls of the side plates of the frame respectively and between the bottom plate of the frame and the screw rod. The connecting end of the push rod is connected with the slider rotationally. The free end of the push rod penetrates one of the side plates and extends outwardly. A plurality of shifting plate grooves are formed in the outer surface of the push rod at intervals and are meshed with the shifting plate. The transmission structure has the advantage of novelty in design.

Description

【Technical field】 [0001] The invention relates to the field of medical instruments, in particular to a transmission structure of a medical injection pump. 【Background technique】 [0002] At present, the screw and slider of medical syringe pumps at home and abroad mainly include the following two connection methods: [0003] One connection method is the half nut transmission method. Under the action of the spring, the half nut engages with the screw rod, and the nut is manually driven to overcome the spring force to make the nut rotate and then separate the nut from the screw rod. When the manual driving action is terminated , The nut is automatically restored to the connection mode of meshing with the screw rod under the action of the spring force. In this way, the push rod and the slider can be manually driven to clutch the half nut and the screw rod, and for syringes of different lengths, the user can easily adjust the position of the slider and the push head. Its disadv...

AI Technical Summary

Problems solved by technology

Its disadvantages are: a. When manually adjusting the position of the pusher head and the slider, the screw teeth of the nut have a high probability of hitting the screw teeth of the screw rod during the reset process, which is a phenomenon of "tooth collision"

However, since the two cannot be separated, the operator cannot conveniently adjust the position of the push head connected to the slider for syringes of different lengths, and the user experience is poor.

Because the position of the push head cannot be manually adjusted, a motor and a transmission mechanism will be added inside the push head to realize the button-catching needle cylinder, which is complicated to control and high in cost

Therefore, this method is rarely used in the industry

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