Syringe Cap Projections for Even Detachment Tension
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Solution Overview
Problem
Syringe caps with smooth, slippery outer surfaces are difficult to detach from syringe bodies due to uneven tension distribution, leading to potential accidents and user discomfort.
Innovation Solution
A syringe cap design featuring projections with inclined surfaces on its outer circumference, providing a tapered portion and varying heights to ensure secure grip and even tension distribution, facilitating easy detachment while reducing the risk of needle contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the syringe cap is made with a smooth outer circumferential surface, then the manufacturing is simple and the appearance is good, but the syringe cap slips during detachment and is difficult to remove
Solution Approach 1:
The patent applies local quality by providing projections at specific locations on the outer circumferential surface of the cap body. These projections create localized rough areas that enhance grip during detachment, while the rest of the cap body maintains its smooth finish for manufacturing simplicity and aesthetic appearance.
Solution Approach 2:
The patent segments the outer circumferential surface by adding discrete projections rather than making the entire surface rough. This segmentation allows the cap body to be manufactured as a smooth piece with added grip features, combining manufacturing simplicity with improved detachment capability.
2Force
If the cap body is pinched to detach, then the detachment force is applied, but the tension is not transmitted to the entire syringe cap due to the smooth surface
Solution Approach 1:
The projections create localized high-friction areas that effectively transmit the pinching force to the entire cap body. When the user pinches the cap, the projections ensure that the tension is distributed across the whole syringe cap rather than slipping off, improving reliability of force transmission.
3Reliability
If the syringe cap is made detachable, then the needle is protected before use, but the cap may be difficult to detach due to the smooth surface
Solution Approach 1:
The patent maintains the detachable design for needle protection while adding localized projections that facilitate easy detachment. The projections provide grip points that allow users to easily remove the cap without compromising the protective function or creating safety issues.
Data Source
AI summary
Provided is a syringe cap including a projection extending in the circumferential direction of a cap body, wherein the projection includes an apex located radially outward of the cap body from the outer circumferential surface of the cap body, a first inclined surface having a starting end located at the apex and having a terminal end located at a position on the side closer to the proximal end of the cap body than the starting end is, and a second inclined surface having a starting end located at the apex and on the outer circumferential surface of the cap body having a terminal end located at a position on the side closer to the distal end of the cap body than the starting end is, on the outer circumferential surface of the cap body, and the shortest distance from the starting end to the terminal end of the first inclined surface is smaller than the shortest distance from the starting end to the terminal end of the second inclined surface.