Pen injector

Abstract

The invention provides a pen injector, which comprises a medicine bottle mounting part, a retaining plug assembly and a metering and injection assembly. The metering and injection assembly comprises a drum support, a push rod drum, a connecting cylinder, a sleeve stud and a push rod, wherein the drum support is tubular, and the inner wall of the drum support is provided with thread-shaped chutes; the push rod drum is movably arranged in the drum support along the axial direction of the drum support; the outer wall of the push rod drum is provided with spiral retaining strips matched with the thread-shaped chutes; the second end of the push rod drum is protruded at the second end of the drum support and is connected with a rotary operation part; the connecting cylinder is arranged in the push rod drum; the first end of the connecting cylinder is abutted with a first limit step; the second end of the connecting cylinder is connected with a press operation part; the sleeve stud and the connecting cylinder are synchronously and rotatablely arranged in the connecting cylinder and are invariable in position along the axial direction and relative to the drum support; the sleeve stud is provided with a threaded through hole; and the push rod movably penetrates in the sleeve stud along the axial direction. The pen injector provided by the invention not only can be recycled and can be regulated in injection quantity but also is simple in operation and convenient in use.

Description

Technical field [0001] The invention relates to the technical field of injection devices, in particular to a pen-type injector. Background technique [0002] In the prior art, many diabetic patients rely on insulin injections for hypoglycemia. Due to their dependence on insulin, the frequency of insulin injections is gradually increased. As a result, more and more patients prefer to inject insulin at home. [0003] The Chinese patent with the application number 200920101143.6 discloses a fully automatic insulin syringe, which achieves the purpose of automatic needle insertion and medicine injection, fast and accurate, without pain. [0004] However, the above syringe has the following defects: [0005] 1. The syringe has no dressing change device, and the syringe needs to be replaced after one use, which causes great waste. [0006] 2. No injection regulating device. Diabetes patients with different degrees of insulin doses are different for each injection, and the syringe has poor ve...

AI Technical Summary

Problems solved by technology

[0005] 1. The syringe does not have a dressing changing device, and the syringe needs to be replaced after one use, which causes great waste

[0006] 2. No injection adjustment device

Diabetic patients of different degrees have different doses of insulin for each injection, and the syringe has poor versatility

And because insulin is expensive, the inability to adjust the dose may cause waste

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