BFS Syringe Cartridge Locking Structure for Sterile Single Use
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Solution Overview
Problem
Existing injectable medicine delivery systems lack features that prevent cross-contamination and ensure sterility, particularly in self-administered single-dose, pre-filled delivery systems, and there is a need for cost-effective and efficient manufacturing of such systems.
Innovation Solution
A syringe cartridge assembly with a compressible cartridge that includes automatic disabling features, such as cooperating structures within the syringe housing and plunger, to prevent removal of the cartridge after use, and a bellows structure that engages with internal annular ribs to secure the cartridge in place, ensuring sterility and preventing reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic disabling features are added to prevent cartridge removal, then sterility and cross-contamination prevention are improved, but device complexity increases
Solution Approach 1:
The disabling feature is segmented into two separate cooperating structures: one structure is integrated into the cartridge, and the other structure is integrated into the syringe housing. This segmentation allows each structure to be relatively simple while collectively providing the disabling function, thus improving sterility without excessively increasing overall device complexity.
Solution Approach 2:
The disabling feature operates automatically through the interaction of the two structures when the cartridge is inserted into the syringe housing, without requiring additional user actions or complex control mechanisms. The system self-regulates to prevent removal, improving sterility while maintaining operational simplicity.
2Reliability
If the bellows structure engages with internal annular ribs to secure the cartridge, then sterility and reuse prevention are improved, but manufacturing complexity increases
Solution Approach 1:
The bellows structure is made from a flexible material that can be formed through conventional manufacturing processes. The flexibility of the material allows the bellows to engage with the internal annular ribs effectively, providing secure cartridge retention and sterility assurance while maintaining ease of manufacture through standard forming techniques.
3Ease of operation
If the plunger includes grasper structure to position the cartridge, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The grasper structure is merged with the plunger as an integrated component rather than a separate mechanism. This merging allows the plunger to perform both its primary function of compressing the bellows and the secondary function of grasping and positioning the cartridge, thereby improving ease of operation while minimizing the increase in device complexity.
Data Source
AI summary
A syringe cartridge assembly includes a syringe housing, a compressible Blow-Fill-Seal (BFS) cartridge at least partially positionable within the syringe housing, and having a fluid agent. In at least some embodiments, the compressible cartridge includes a compressible bellows segment configured to transition between an initial condition and an at least partially compressed condition. A plunger is configured for movement within the syringe housing to cause transition of the compressible bellow segment from the initial condition to the at least partially compressed condition to and push the cartridge into a double-ended cannulated needle of a deliver assembly attached to the syringe housing, causing one end of the needle to penetrate the compressible BFS cartridge and dispense the fluid agent into a patient via the opposing end thereof.