Medical Closure Assembly with Segmented Drive Mechanisms
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Solution Overview
Problem
Current medical closure assemblies fail to provide a secure and reliable fluid-restricting connection for medical fittings, such as pre-loaded syringes and IV bags, while also ensuring that any use or tampering is detectable and preventing reconnection after initial use, and must be cost-effective for widespread adoption.
Innovation Solution
A closure assembly with a cap and base structure that restricts fluid flow, featuring a primary and secondary drive assembly with 'ramp and cliff' mechanisms for secure fastening and unfastening in opposite directions, preventing reconnection by disengaging the primary drive assembly upon reaching a torque limit, ensuring single-use functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closure assembly is designed to prevent reconnection and provide evidence of use, then security and reliability are improved, but device complexity increases
Solution Approach 1:
The closure assembly is divided into distinct functional segments: a cap portion with a primary drive assembly for fastening, a secondary drive assembly for unfastening, and a base portion. The primary and secondary drive assemblies are independently disposed, allowing them to operate separately. This segmentation enables the system to provide secure fastening and unfastening functions while maintaining manageable complexity through modular design.
Solution Approach 2:
The closure assembly incorporates dynamic drive mechanisms that change state based on operational requirements. The primary drive assembly engages during fastening operations, while the secondary drive assembly engages during unfastening operations. This dynamic engagement of different drive mechanisms allows the system to provide secure connection and controlled disconnection functions without requiring both mechanisms to be simultaneously complex.
2Reliability
If a closure assembly provides secure fastening and unfastening mechanisms, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The drive mechanisms are segmented into primary and secondary independent assemblies, each handling one aspect of the operation. The primary drive assembly manages fastening with its own drive segments, while the secondary drive assembly manages unfastening. This segmentation allows each mechanism to be optimized for its specific function, providing secure operation while maintaining simplicity in the overall system architecture.
Solution Approach 2:
The primary and secondary drive assemblies are designed with opposite engagement characteristics. The primary drive assembly facilitates fastening in one rotational direction, while the secondary drive assembly facilitates unfastening in the opposite direction. This inverted design allows for intuitive operation where the user naturally applies force in the appropriate direction, making the operation easier while maintaining secure fastening through the mechanical advantage provided by each drive mechanism.
3Reliability
If a closure assembly is designed for single-use functionality, then security is improved, but manufacturing cost increases
Solution Approach 1:
The closure assembly is manufactured as a segmented system with the cap portion and base portion that can be assembled together. The primary and secondary drive assemblies are independently manufactured components that are then integrated. This segmentation allows for cost-effective manufacturing of individual components that can be produced using standard manufacturing processes, while the assembled system provides the required single-use functionality with its inherent security features.
Solution Approach 2:
The closure assembly is designed as a disposable single-use device that is manufactured cost-effectively and then discarded after one use. The segmented design allows each component to be manufactured efficiently and assembled into a complete unit that provides secure fastening and unfastening capabilities. The system's affordability is maintained through efficient manufacturing of its modular components, making the single-use functional design economically viable.
Data Source
AI summary
A closure assembly for a medical fitting including a cap, connectable in flow restricting relation to the fitting and adjustably connected to an end section having a base removably connected thereto. A primary drive assembly and a secondary drive assembly are each independently disposed in interconnecting relation between the cap and the end section. The primary and secondary drive assemblies are respectively structured to facilitate fastening and unfastening of the fitting and the cap upon oppositely directed, relative rotation between the fitting and the cap in a fastening direction and in an unfastening direction. An exterior housing may be fixedly connected to the end section and includes a hollow interior dimensioned to receive and/or retained the cap and the base therein.