An injection pen with high injection precision

CN115227909BActive Publication Date: 2025-09-23ZHONGSHAN HUIFENG MEDICAL PACKAGING TECH CO LTD
View PDF 2 Cites 0 Cited by

Patent Information

Application Number
CN202210993088.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-18
Publication Date
2025-09-23
Estimated Expiration
2042-08-18

AI Technical Summary

Technical Problem

Existing injection pens have many parts and a complex structure, resulting in low injection accuracy and making it difficult to meet the accuracy requirements of small-dose injections.

Method used

The injection pen structure with a spiral tube, inner tube, knob ring and return spring is adopted. Through threaded connection and clutch teeth, the number of parts is reduced and rotation and axial movement are restricted, thereby improving injection accuracy.

Benefits of technology

It simplifies the assembly process, reduces fitting errors, improves injection accuracy and safety, and is suitable for precise injection of small doses of liquid medicine.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN115227909B_ABST
    Figure CN115227909B_ABST
Patent Text Reader

Abstract

The present invention discloses an injection pen with high injection precision, comprising a pen housing, an injection assembly and a drive assembly within the pen housing. The injection assembly includes a syringe with a piston and a screw. The drive assembly includes a fixed ring fixed within the pen housing, a spiral tube threadedly connected to the fixed ring, and an injection dose limiting structure disposed between the spiral tube and the screw. The spiral tube also includes an inner tube disposed within the spiral tube, a knob ring disposed at the upper end of the spiral tube, a boss disposed at the upper portion of the inner tube, and a first clutch tooth disposed on the lower end surface of the boss. The upper end of the spiral tube abuts against the lower surface of the boss, thereby restricting downward movement of the boss. A second clutch tooth is disposed on the upper end surface of the spiral tube, limiting axial movement and circumferential rotation of the boss between the upper end of the spiral tube and the upper top surface of the knob ring. A return spring is disposed between the upper top surface of the knob ring and the inner tube to press the inner tube downward. The present invention has the advantages of a small number of parts, reduced fitting errors, and improved injection precision.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • End point control method of injector and injector thereof

    CN109663177A

  • Injection pen with high injection precision

    CN219231020U