Bellows Syringe Nested Cap for Sterile Fluid Dispensing
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Solution Overview
Problem
Current disposable syringes and fluid delivery systems lack efficient mechanisms for secure attachment and controlled fluid dispensing, particularly in medical applications where sterility and single-use requirements are critical.
Innovation Solution
A bellows syringe system comprising a cap member with a depending skirt portion and a bellows member, where the bellows member is held in a compressed state within the cap member's internal cavity, featuring radially-inward extending tab members for secure attachment to a piston head, and a discharge port mechanism for controlled fluid dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disposable syringe system is used, then sterility and single-use requirements are met, but secure attachment to piston element and controlled fluid dispensing become difficult to achieve
Solution Approach 1:
The bellows member is nested within the cap member's internal cavity in a compressed state. During operation, the bellows expands from this nested configuration to dispense fluid, and then recoils back into the cap member after use. This nesting mechanism enables both secure attachment and controlled dispensing while maintaining sterility.
Solution Approach 2:
The bellows member transitions from a static compressed state held by tab members to a dynamic expanded state during fluid dispensing. The flexible bellows structure allows controlled expansion and contraction, enabling precise fluid delivery while maintaining secure attachment to the piston element throughout the cycle.
2Reliability
If a bellows member is held in compressed state within cap member, then secure attachment is achieved, but device complexity increases
Solution Approach 1:
The bellows member is constructed as a flexible thin-walled structure that can be compressed and expanded. This flexible shell design allows the bellows to be held in a compact compressed state within the cap member using simple tab members, reducing overall device complexity while maintaining secure attachment capabilities.
Solution Approach 2:
The entire syringe system including the bellows member and cap member is designed as a disposable unit. This eliminates the need for complex reusable components and sterilization mechanisms, simplifying the overall device structure while ensuring secure attachment and controlled dispensing for each use.
3Ease of operation
If tab members are used for attachment, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The tab members are designed with specific local geometric features including predetermined break points and engagement surfaces. These localized quality enhancements allow the tabs to provide secure attachment through simple snap-fit engagement, improving ease of operation while keeping manufacturing precision requirements manageable through focused design at critical locations.
Data Source
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AI summary
A bellows assembly for a fluid delivery system is a multi-component device that includes a cylindrical pressure jacket and a bellows syringe that is received within the pressure jacket. The bellows syringe includes a cap member and a bellows member. The bellows syringe in one embodiment is adapted to be secured to the pressure jacket by the cap member. The cap member is formed with a discharge port, which may be formed as conventional luer fitting. The discharge port is disposed coaxially within an annular wall on the outward facing side of the cap member and may be recessed within the annular wall. The bellows member is a hollow body that includes a series of bellows sections or rings. A distal end of the bellow member is formed with a discharge neck terminating in a discharge port, and the proximal end is formed with a closed end wall.