Injection pen

Abstract

The invention provides an injection pen, which comprises a dosage regulating portion and a cartridge portion, wherein the cartridge portion comprises a cartridge shell and a first clutch mechanism; the first clutch mechanism comprises a clutch base, and the clutch base is detachably connected to one end of the cartridge shell; the dosage regulating portion comprises a pen tube, a dial drum, a non-return sleeve, a return screw barrel and a bidirectional screw rod; one end of the pen tube is detachably connected to the clutch base; the dial drum is inserted in the pen tube and the dial drum is in threaded connection to the pen tube; the non-return sleeve is inserted in the dial drum, and a second clutch mechanism is arranged between the inner wall of the dial drum and the upper end of the non-return sleeve; a first pawl mechanism is arranged between the inner wall of the dial drum and the outer wall of the non-return sleeve; the return screw drum is inserted in the non-return sleeve, and the upper end of the return screw barrel is clamped with and connected to the upper end of the non-return sleeve; and a third clutch mechanism is arranged between the lower end of the non-return sleeve and the lower end of the return screw barrel. According to the injection pen disclosed by the invention, resource recycling is achieved, user's purchasing cost is reduced and user's burden is relieved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an injection pen. Background technique [0002] Diabetes is a group of metabolic diseases characterized by hyperglycemia. Hyperglycemia is caused by defective insulin secretion or impaired biological action, or both. There are many treatment methods for diabetes, including drug therapy, exercise therapy, diet therapy and so on. Among them, insulin injection therapy in drug therapy is the most common and effective treatment method, which requires patients to inject insulin regularly and quantitatively. Therefore, the injection pen becomes a tool for patients to inject insulin by themselves. [0003] Injection pens in the prior art include liquid medicine tubes, coiled tubes, clutch tubes, screw rods and nut tubes. A piston is arranged at one end of the screw rod, and the piston is arranged in the liquid medicine pipe. The other end of the screw rod is installed in the...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide an injection pen to solve the problem in the prior art that when the liquid medicine in the liquid medicine tube is injected, the whole injection pen cannot be reused and the liquid medicine tube cannot be replaced, which wastes resources and increases Technical problems that increase the user's purchase cost and increase the user's burden

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