an injection pen

Abstract

The invention relates to an injection pen. The injection pen comprises a refill shell, a push rod, an internal-thread shaft sleeve, a triangular movable racket wheel, a spring and a limiting joint, wherein the push rod penetrates through the refill shell; the internal-thread shaft sleeve, the triangular movable racket wheel and the spring are arranged in the refill shell; the limiting joint is clamped at the lower end of the refill shell; the push rod is provided with screw threads of a certain length; a pawl is attached to the end of the screw threads; the internal-thread shaft sleeve is spirally fixed on the screw threads on the push rod; the triangular movable racket wheel is embedded into the push rod, and is meshed with the pawl on the push rod; the spring is embedded into the push rod; one end of the spring is pressed against the triangular movable racket wheel, and the other end of the spring is pressed against the limiting joint; the limiting joint is connected to the push rod in a sleeving way. The injection pen has the advantages of simple structure, convenience in use and operation, accuracy in injection, low production cost, compact structure and easiness in carrying.

Description

technical field [0001] The invention relates to the field of medical devices, and specifically discloses an injection pen. Background technique [0002] Various syringes are of a great variety on the market, and it mainly has the following disadvantages: [0003] 1. Most of the existing products are controlled by threaded knobs, and the operation is more complicated; [0004] 2. For the one-milliliter cartridge, some existing products use human eyes to directly observe the exhaust, which cannot achieve precise exhaust, which will cause waste of liquid medicine and increase the error during injection. Reduce its injection accuracy; [0005] 3. The product structure is complex and the production cost is high; [0006] 4. The complex structure makes the assembly process too cumbersome and increases the labor intensity; [0007] 5. The existing product has a large size and is not easy to carry. Contents of the invention [0008] The object of the present invention is to p...

AI Technical Summary

Problems solved by technology

[0003] 1. Most of the existing products are controlled by threaded knobs, and the operation is more complicated;

[0004] 2. For the one-milliliter cartridge, some existing products use human eyes to directly observe the exhaust, which cannot achieve accurate exhaust, which will cause waste of liquid medicine and increase the error during injection. Reduce its injection accuracy;

[0005] 3. The product structure is complex and the production cost is high;

[0006] 4. The complex structure makes the assembly process too cumbersome and increases the labor intensity;

[0007] 5. Existing products are large in size and difficult to carry

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