Separable Safety Injector Sleeve for Needle Disposal
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Solution Overview
Problem
Current safety injectors face challenges with large waste disposal volumes due to the fixed connection of the injection needle and safety sleeve, making disposal difficult and increasing the risk of injury, and they are not suitable for use with fixed injection devices like drip cylinders.
Innovation Solution
A safety injector design where the needle seat and safety sleeve are separable from the injection cylinder, allowing easy assembly, operation, and disposal, with the safety sleeve covering the needle after use to prevent injury and enabling use with fixed injection devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injection needle and safety sleeve are fixedly connected to the injection cylinder, then the safety protection function is improved, but the waste disposal volume increases and disposal difficulty increases
Solution Approach 1:
The device is divided into separable modules: the injection cylinder can be separated from the needle assembly (needle seat + injection needle + safety sleeve). After injection, the needle assembly is detached and disposed of separately from the injection cylinder, reducing waste disposal volume while maintaining safety protection during use
Solution Approach 2:
The needle assembly (including safety sleeve) is extracted as a separate disposable component from the injection cylinder. The safety sleeve remains connected to the needle seat during use for protection, but the entire needle assembly can be removed and discarded separately after use, eliminating the need to dispose of the entire injection device
2Device complexity
If the injection needle is fixed to the injection cylinder, then the structural simplicity is improved, but the adaptability to fixed injection devices deteriorates
Solution Approach 1:
The injection system is segmented into a reusable injection cylinder and a disposable needle assembly. The needle seat includes a connection structure that can be attached to or separated from the injection cylinder, enabling the injection cylinder to be used with different needle assemblies or fixed injection devices as needed
3Reliability
If the safety sleeve covers the injection needle during use, then the safety protection is improved, but the ease of operation deteriorates due to assembly complexity
Solution Approach 1:
The safety sleeve is merged with the needle seat to form an integrated needle assembly. This combination simplifies assembly operations because the safety sleeve and needle seat are pre-assembled as one unit that attaches to the injection cylinder in a single step, rather than requiring separate assembly of multiple components
Data Source
AI summary
A safety injector includes: an injection module having an injection cylinder and a pullable piston rod; a needle module including a needle seat and an injection needle; the needle seat having a seat body and a buckle. In installation state, a safety sleeve covering movably around the injection cylinder between an installation position and a protection position. In the installing position, a first end portion of the safety sleeve is near the buckle and the second end portion thereof is near the handhold portion; while in the protection position, the first end portion is protruded from the injection cylinder for covering the injection needle and the second end portion is near the head portion of the injection cylinder. An inner side of the sleeve body is formed with a first and a second annular flange; and an annular groove is formed therebetween for confining the buckle.