Automatic injection pen

Abstract

The invention provides an automatic injection pen, including an upper housing, a lower housing, a syringe, a piston rod for squeezing an inner space of the syringe, a drive sleeve sleeved with the piston rod, and a trigger sleeve sleeved on the drive sleeve and slidably connected with the upper housing along an axial direction of the upper housing for clamping the piston rod. The triggering sleevearranged inside the lower housing and slidably connected with the lower housing along the axial direction thereof, for pushing the triggering sleeve to move along the axial direction of the upper housing so that the triggering sleeve and the piston rod are disengaged from the clamping connection, and pushing the piston rod to squeeze the syringe barrel through the driving sleeve; the upper housing and the lower housing are pivotally connected in the circumferential direction thereof so that the trigger sleeve can be pushed by the trigger sleeve when the trigger sleeve is in the open positionby relative rotating between the upper housing and the lower housing. Compared with the prior art, the present application can simplify the internal structure of the automatic injection pen and reducethe production cost.

Description

technical field [0001] The invention relates to a medical injection pen, in particular to an automatic injection pen. Background technique [0002] Automatic injection pen, as a commonly used medical device, can replace manual needle insertion, injection, etc., to accurately extrude the required dose. [0003] Among the existing automatic injection pens, for example, the patent application document CN201611226505 discloses a card-type automatic injection pen, which requires the cooperation of a button mechanism, a card-type needle mechanism, and a firing mechanism to realize the release and injection of the needle. , its internal structure is relatively complicated, and its production cost is relatively high, which affects its popularization and application, and increases the burden of users' purchase and use. [0004] Therefore, how to simplify the internal structure of the automatic injection pen and reduce the production cost is an urgent problem to be solved. Contents...

AI Technical Summary

Problems solved by technology

[0003] Among the existing automatic injection pens, for example, the patent application document CN201611226505 discloses a card-type automatic injection pen, which requires the cooperation of a button mechanism, a card-type needle mechanism, and a firing mechanism to realize the release and injection of the needle. , its internal structure is relatively complex and its production cost is high, which affects its promotion and application, and increases the burden of users' purchase and use

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