Prefilled Syringe Shield Assembly for Secure Needle Locking
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Solution Overview
Problem
Existing prefilled syringes face issues with needle exposure during disposal, posing risks to waste recycling personnel and healthcare workers, and current protective sleeves are prone to detachment and require manual alignment, increasing the risk of needlestick injuries.
Innovation Solution
A prefilled syringe with a shield assembly featuring a mounting part, shield unit, and needle sleeve unit, where the shield unit includes contractile parts that expand and contract to securely shield the needle after use, allowing for one-step exposure and removal without additional unlocking steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective sleeves are used to cover needles after injection, then needle exposure is prevented, but the protective sleeves are prone to detachment during waste transportation
Solution Approach 1:
The protective sleeve is divided into multiple segments that can independently engage with the syringe body, ensuring that if one segment becomes disengaged, other segments maintain the shielding function. This segmentation approach prevents complete failure of the shielding system during waste transportation.
Solution Approach 2:
The protective sleeve is designed to nest within the syringe body structure, with interlocking features that allow the sleeve to be securely positioned within the syringe housing. This nested configuration ensures the protective sleeve remains attached during handling and transportation of waste.
2Manufacturing precision
If protective sleeves are designed to sleeve needles snugly during automated manufacturing, then manufacturing precision is improved, but manual recapping requires additional energy and time
Solution Approach 1:
The protective sleeve is pre-positioned and pre-aligned with the needle during the manufacturing process, so that after injection, the sleeve remains in the correct position for automatic retraction without requiring manual alignment. This preliminary positioning eliminates the time-consuming manual recapping step.
Solution Approach 2:
The protective sleeve is designed to automatically retract and reposition itself after injection without requiring manual intervention. The sleeve uses elastic recovery and mechanical guidance features to self-align and self-position, eliminating the need for nurses to manually recap the needle.
3Ease of manufacture
If protective sleeves are designed as single-use assemblies, then ease of manufacture is improved, but the protective sleeves become difficult to locate after injection
Solution Approach 1:
The protective sleeve incorporates color-coded indicators or visual markers that change or become visible after injection, allowing easy location and tracking of the sleeve's position. This visual information helps healthcare workers quickly identify the status and location of the protective sleeve without requiring complex tracking systems.
4Object-affected harmful factors
If manual recapping of protective sleeves is performed, then needle exposure prevention is achieved, but the risk of needlestick injuries to nurses increases
Solution Approach 1:
The manual mechanical action of recapping the protective sleeve is replaced with an automated mechanical system that uses spring-loaded retraction and motorized positioning. This substitution eliminates the need for nurses to manually handle the protective sleeve near the needle, thereby removing the needlestick injury risk associated with manual recapping.
Solution Approach 2:
An automated mechanism acts as an intermediary between the protective sleeve and the needle, controlling the sleeve's movement and positioning without requiring direct manual contact from nurses. This intermediary system safely manages the protective sleeve's interaction with the needle, preventing needlestick injuries while maintaining needle coverage.
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 shield design effectively prevents needle exposure throughout the disposal process, reduces the risk of needlestick injuries by simplifying the shielding process, and ensures seamless integration with existing syringe designs without interfering with visual inspection.
Implementation Method 1
the contractile part includes a first contractile part and a second contractile part... the inner diameter of the first contractile part and the inner diameter of the second contractile part are allowed to be expanded, and the first contractile part and the second contractile part may contract after the inner diameters are expanded
Data Source
AI summary
The present disclosure belongs to the technical field of medical appliances, and particularly relates to a prefilled syringe with a shield and an assembly thereof, an assembling method for the assembly, and a medicine filling method. By means of a syringe barrel, a mounting part, and a needle, as well as a shield unit sleeved on the main body of the syringe barrel, a syringe barrel flange provided on a needle mounting pipe, and a needle sleeve unit sleeved on the needle mounting pipe, deposited in the shield unit. The present disclosure has the advantages that the opening of the shield and the exposure of the needle can be achieved by means of a one-step upward pushing operation; after the shield is unlocked, the needle sleeve unit can be removed smoothly; when the shield returns to the initial position, the shield is locked with the syringe barrel flange.