Multi-dose adjustable prefillable injection pen

Abstract

The invention discloses a multi-dose adjustable prefillable injection pen. The multi-dose adjustable prefillable injection pen comprises a pen body, an injection push rod, a push rod sleeve, a clutch hub, an end limiting piece and a dose hub. The injection push rod is in threaded connection with the pen body. The push rod sleeve is in sliding fit with the injection push rod along the injection direction and can transmit a torque along the screwing-in direction of the injection push rod. The push rod sleeve is connected with the pen body through a first group of ratchet and pawl mechanism. The clutch hub is in sliding fit with the push rod sleeve along the injection direction. The dose hub is rotationally connected with the pen body through threads. Rotation between the clutch hub and the dose hub is limited through a clamping structure capable of being disengaged along the injection direction. The end limiting piece and the dose hub are supported through a supporting foot capable of elastic-deformation along the injection direction. The clamping structure can be pushed to be disengaged from connection by rotating the dose hub prior to elastic-deformation of supporting foot. The multi-dose adjustable prefillable injection pen can effectively solve problems of inconvenient operation and poor effect of dose adjustment in existing injection pens.

Description

technical field [0001] The invention relates to the technical field of injection equipment, in particular to a multi-dose adjustable prefilled injection pen. Background technique [0002] The current product structure of the injection pen is complex, the number of parts is large, and the processing procedures are many, resulting in low product reliability; some products use glue to bond parts between parts during the processing process, which has biological risks; product parts involve There are many metal products, resulting in an increase in product cost, and the use effect is not good. [0003] To sum up, how to effectively solve the current problems of inconvenient operation of injection pens and poor dosage adjustment effects is an urgent problem for those skilled in the art. Contents of the invention [0004] In view of this, the purpose of the present invention is to provide a multi-dose adjustable pre-filled injection pen, which can effectively solve the problems ...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a multi-dose adjustable pre-filled injection pen, which can effectively solve the problems of inconvenient operation and poor dose adjustment effect of current injection pens.

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