A scroll spring assembly

CN224387865UActive Publication Date: 2026-06-23ESC MEDTECH (SUZHOU) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ESC MEDTECH (SUZHOU) CO LTD
Filing Date
2025-02-21
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

The torsion springs used in existing injection pens have low energy storage density and cannot provide large torque, making them unsuitable for the injection of highly viscous liquids and large molecule drugs.

Method used

The spiral spring assembly includes a spring seat, a sleeve, and a spiral spring. The inner end of the spiral spring is connected to the sleeve, and the outer end is fixed to the inner wall of the spring seat by a hook. The curvature of the outer end of the spiral spring is not greater than the curvature of the inner wall of the spring seat, providing a large torque energy storage and thrust.

Benefits of technology

The spiral spring assembly can provide greater torque and thrust, meeting the needs of injecting drugs with high viscosity and large molecules, thus improving injection efficiency.

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    Figure CN224387865U_ABST
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Abstract

The utility model discloses a scroll spring assembly, including spring seat, the sleeve is rotationally arranged in spring seat, the inner wall of spring seat and the outer wall of sleeve are set up scroll spring, and the inner end of scroll spring is connected with sleeve, and the outer circumference of sleeve is fixedly set up clamping block, and the inner end of scroll spring is set up and is connected in the clamping hole, and the curvature of the inner end of scroll spring is not less than the curvature of the outer circumference of sleeve, the inner wall of spring seat is fixedly set up and is connected, and the outer end of scroll spring is fixedly set up and is connected, and the curvature of the outer end of scroll spring is not greater than the curvature of spring seat inner wall, the utility model discloses the scroll spring assembly, when carrying out injection, scroll spring assembly provides greater torque, and provides greater thrust for injection, and the demand of solving injection viscosity big drug and macromolecular drug is solved.
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