Injection pen

Abstract

The invention discloses an injection pen. The injection pen comprises a pen holder, the front end portion of the pen holder is provided with a medicine bin, the rear end portion of the pen holder is provided with a trigger, a dosage cylinder, a differential speed rod and a transmission rod are coaxially arranged in the pen holder from outside to inside in sequence, the transmission rod is connected with a key groove of the differential speed rod, the inner wall of the pen holder is provided a limit bump which is matched with the transmission rod, the front end portion of the dosage cylinder is provided with a transmission clutch, the rear end portion of the transmission clutch is provided with a clamping tooth, the transmission rod is provided with an inner ring teeth which is meshed with the clamping teeth in an adaptive mode, the transmission chute and the dosage cylinder can be linked in an unidirectional transmission mode, the front end portion of the dosage cylinder is further provided with a push rod base, the front portion of the push rod base is provided with a push piece, a push rod which is matched with the push piece is coaxially arranged in the push rod base in a thread matched mode, and the push rod base and the transmission rod are linked in an unidirectional transmission mode. The injection pen is convenient and easy to operate, and the dosage of medicine can be controlled accurately.

Description

technical field [0001] The present invention relates to the technical field of medical equipment, in particular to an injection pen. Background technique [0002] An injection pen is a medical device widely used in clinical medicine for drug injection. [0003] At present, disposable sterile syringes are mainly used for drug injection on the market, but the injection process requires hospital visits and operations and injections by professionals. The convenience of operation is not suitable for self-management of most chronic disease patients. Major companies at home and abroad are mostly committed to the fields and directions of needle-free injection, automatic injection, electronic injection pen and pure mechanical injection pen, but these solutions have great defects, low reliability, high cost, and even skin damage after long-term use . At present, the pure mechanical injection pen has the best safety and reliability in the structure of screw drive, clutch drive, and t...

AI Technical Summary

Problems solved by technology

However, most of the existing mechanical injection pen products have cumbersome steps in the injection process, high resistance, and inconvenient operation for patients. Because of the many components and complex structures, there is a high probability of deviation in the injection dose. In addition, the patients are older and less mobile. It is inconvenient to set an easily recognizable measurement display structure and prompts

Images