Safety Syringe Needle Guard Spring Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current insulin injection methods, such as insulin pens, face inaccuracies in dose control and safety concerns due to small needle tips and thin cap designs, which can lead to needle punctures and infection risks for patients and healthcare workers.
Innovation Solution
A safety syringe with an injection end featuring a needle guard assembly and spring mechanism that automatically exposes and retracts the needle, combined with an electronically-controlled component housing for precise dose control and energy efficiency, and a protective sleeve to prevent needle exposure during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a small needle tip and thin cap wall design is used in insulin pens, then the device can be compact and easy to use, but the needle can easily puncture the cap wall and cause safety risks to patients and staff
Solution Approach 1:
The patent introduces a protective cap with sufficient wall thickness as an intermediary barrier between the needle and the external environment. This protective cap prevents direct contact between the needle and users, eliminating the puncture risk while maintaining the compact design of the insulin pen.
Solution Approach 2:
The patent segments the protective cap into distinct functional zones: a thicker wall section for safety protection and a thinner wall section for comfort. This segmentation allows the cap to simultaneously provide robust protection against needle punctures while maintaining user comfort during injection.
2Productivity
If manual injection method with adjustable positioning block and springs is used, then the insulin pen can be repeatedly used, but the injection dose control becomes inaccurate
Solution Approach 1:
The patent replaces the manual mechanical adjustment system (positioning block and clutch spring) with an electronic control system featuring a microcomputer and micro-motor. This substitution enables precise digital control of injection dosage while maintaining the ability to perform multiple injections, resolving the contradiction between repeatability and precision.
3Extent of automation
If automatic injection device with micro-computer and micro-motor is used, then injection action can be completed automatically, but battery replacement becomes inconvenient
Solution Approach 1:
The patent employs disposable needle caps that are discarded after a single use. This approach eliminates the need for complex battery management and replacement, as each disposable unit contains its own power source integrated into the single-use component, simplifying operation for users.
4Ease of operation
If the protective cap wall is made thinner for comfort, then the device is more comfortable to use, but the needle can easily puncture the cap wall causing safety risks
Solution Approach 1:
The protective cap is segmented into different wall thickness zones: a thicker section providing robust needle containment safety and a thinner section providing user comfort. This segmentation resolves the contradiction by allowing each zone to optimize for its specific function.
Solution Approach 2:
The cap wall thickness is varied locally according to functional requirements: thicker walls in areas requiring needle containment and thinner walls in areas contacting the user. This local quality differentiation simultaneously achieves safety and comfort.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures accurate insulin dosing, reduces the risk of needle exposure and infection, and conserves energy by recycling mechanical energy into electrical energy for the syringe's components.
Implementation Method 1
a first terminal of the spring is connected to the needle base and a second terminal of the spring is connected to the protective casing... when the injection end is in an in-use status, the injection needle is pressed against skin, the injection needle is automatically exposed out from the protective casing and punctured, the spring is in a compressed state, and the protective casing is rotated out from a first locking groove on the protective casing by the torsion force of the spring
Implementation Method 2
when the injection end is in a post-use status, the injection needle is pulled out from the skin, the protective casing is moved away from the skin due to an elastic force of the compressed spring
Data Source
AI summary
A needle end and a safety syringe are provided, belonging to technical field of medical instruments. The safety syringe includes an injection end, a liquid storage device, and a base. The injection end includes a needle base, an injection needle, and a needle guard assembly. The injection needle is fixed to the needle base. The needle guard assembly is connected to the needle base. The needle guard assembly includes a protective casing and a spring, wherein a first terminal of the spring is connected to the needle base and a second terminal of the spring is connected to the protective casing. The liquid storage device includes a liquid storage container and a liquid storage sleeve. The liquid storage is sleeved on an outer surface the liquid storage container, wherein the liquid storage container is detachably connected to the injection end. The base is detachably connected to the liquid storage device.