Syringe Gasket Pressing Mechanism for Interruptible Dose Control
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Solution Overview
Problem
Existing prefilled syringes do not allow for easy interruption of medicine administration or administration in batches, as the operation continues until the entire contents are discharged.
Innovation Solution
A gasket pressing tool that biases the gasket in a distal end direction, allowing for easy interruption and control of medicine discharge by releasing and re-engaging engagement protrusions using a mechanism with movement restriction members and an operation member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of gaskets are stacked together to form a gasket stack, then the gasket stack can serve multiple injection sites, but the gaskets tend to shift relative to one another causing misalignment
Solution Approach 1:
The gasket stack is segmented into individual gaskets, each with registration features that divide and control the positioning of each component separately, preventing collective shifting while maintaining multi-site functionality
Solution Approach 2:
Registration features act as intermediary elements between the gasket stack and the anvil, providing a mediating mechanism that ensures precise alignment and prevents shifting during the molding process
2Ease of operation
If conventional molding techniques are used with stacked gaskets, then the process is simple, but the gaskets shift relative to one another causing misalignment
Solution Approach 1:
The gasket stack performs self-alignment through integrated registration features that automatically position each gasket correctly without requiring complex external alignment mechanisms or procedures
Solution Approach 2:
Registration features serve as intermediary elements that facilitate precise positioning between the gasket stack and molding apparatus, maintaining simplicity while achieving high alignment precision
3Adaptability or versatility
If gaskets are stacked to create a gasket stack for multiple injection sites, then versatility is improved, but alignment between gaskets becomes difficult to maintain
Solution Approach 1:
Registration features act as intermediary positioning elements that automatically maintain alignment between multiple gaskets in the stack, eliminating the need for manual alignment maintenance while supporting multiple injection sites
Solution Approach 2:
The registration features provide universal alignment functionality across all gaskets in the stack, enabling a single mechanism to maintain precise positioning for multiple injection sites simultaneously
Data Source
Figure 1~3
Figure 4~6
Figure 7
AI summary
A gasket pressing tool 3 includes a syringe attachment member 4 attached to an outer tube 20, a gasket pressing member 8 that presses a gasket 22 of a syringe, a pressing member biasing body 11 accommodated in the gasket pressing member, a biasing body pressing tubular member 6 that accommodates a rear end portion of the pressing member biasing body and has side portions provided with opening portions 64 and 65, and movement restriction members 7a and 7b of the pressing member 8 held by the tubular member 6 and having engagement protrusions 72 that enter through the opening portions 64 and 65 of the tubular member 6. The pressing tool 3 has an engaged state maintaining function for the engagement protrusion 72 of the movement restriction member and the pressing member-side engagement portion 83 of the pressing member 8, and an operation function for the engagement protrusion 72 for releasing the engagement therebetween.