Reconstitution Assembly Triggering Mechanism for Aseptic Drug Mixing
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Solution Overview
Problem
The reconstitution of lyophilized drugs in a home environment is challenging due to the need for precise aseptic manipulation of multiple components, potential air entry into vials creating difficulties, and the risk of user error leading to product waste, especially given the high cost of these drugs.
Innovation Solution
A reconstitution assembly with a housing containing an upper and lower sleeve, a transfer set assembly with opposing spikes for fluid flow, and a triggering mechanism that allows for sterile fluid communication between containers without requiring complex user interaction, ensuring minimal mechanical and user error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reconstitution process is used with multiple components and needles, then sterility can be maintained, but user complexity and difficulty of operation increase significantly
Solution Approach 1:
The patent combines multiple separate components (diluent vial, drug vial, transfer syringe, needle) into a single pre-assembled unit. The housing integrates both vials in fixed positions, and the transfer mechanism is pre-attached, eliminating the need for users to manually assemble multiple sterile components and reducing steps while maintaining sterility throughout the process.
Solution Approach 2:
The device performs preliminary assembly and sterilization of all components before use. The housing, vials, and transfer mechanism are pre-assembled and sterilized together as a complete unit, so that when the user receives the device, it is already in a sterile, ready-to-use state without requiring the user to perform complex assembly steps that could compromise sterility.
2Productivity
If user manually manipulates multiple components sequentially, then reconstitution can be completed, but risk of user error and product waste increases
Solution Approach 1:
The device segments the reconstitution process into automatic stages controlled by the triggering mechanism. The first trigger automatically activates fluid transfer from the diluent vial to the drug vial, and the second trigger automatically initiates mixing. This segmentation eliminates manual intervention during critical fluid transfer steps, reducing user error risk while ensuring complete reconstitution.
Solution Approach 2:
The device performs fluid transfer and mixing operations automatically without requiring precise manual manipulation by the user. The triggering mechanism detects when vials are properly positioned and automatically activates the fluid transfer pump and mixing actions, allowing the system to service itself and reducing dependence on user skill and attention.
3Ease of operation
If vial negative pressure is utilized for automatic fluid transfer, then ease of operation improves, but air entry into vial prior to injection creates difficulties
Solution Approach 1:
The patent introduces a fluid transfer pump as an intermediary mechanism between the diluent vial and drug vial. Instead of relying solely on negative pressure that could allow air entry, the pump actively transfers fluid through sealed pathways. The pump creates controlled suction that maintains positive pressure in the diluent vial, preventing air entry while still enabling automatic fluid transfer when triggered.
4Reliability
If minimal user interaction is provided, then product waste from user error decreases, but device complexity increases
Solution Approach 1:
The device nests multiple functional components within a compact housing structure. The diluent vial and drug vial are nested within the housing in specific orientations, the transfer pump is integrated into the housing, and the triggering mechanism is built into the assembly. This nesting allows the complex device to maintain a compact, manageable form factor while incorporating automated fluid transfer and mixing capabilities that minimize user interaction and prevent product waste.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The assembly facilitates efficient and sterile reconstitution of lyophilized drugs by minimizing user interaction and steps, preventing unintentional tampering, and reducing the risk of air entry, thus ensuring effective reconstitution with minimal product waste.
Implementation Method 1
The second container is disposed with the second seal cap facing upward toward the first seal cap. The contents of the second container are sealed by the second seal cap under a vacuum.
Implementation Method 2
many lyophilized drugs are provided in vials having the interior at a negative pressure relative to the atmosphere. This negative pressure facilitates reconstitution as it compensates for the volume of diluents which is injected into the vial for reconstitution.
Data Source
AI summary
A reconstitution assembly for reconstituting a medication contained in a first container with a diluent contained in a second container, the first container including a first opening sealed with a first penetrable seal cap and the second container including a second opening including a second penetrable seal cap, is described. The assembly comprises: (a) a housing (12, 20, 30) forming a passageway (11), at least a portion of the first container (70) disposed within the passageway (11), the housing moveably retaining the first container in a first resting position, at least a portion of the second container disposed in the passageway (11), the first and second containers (70, 80) arranged such that the first opening of the first container faces the second opening of the second container; (b) a transfer set assembly (40) attached to the housing (12) and positioned between the first container (70) and the second container (80), the transfer set assembly (40) including a first spike (52) extending toward the first penetrable seal cap and a second spike (62) extending toward the second penetrable seal cap, the assembly forming a fluid path (42) extending through at least a portion of the first spike and a portion of the second spike, the first spike not penetrating the first seal cap when the first container is in the first resting position; and (c) a triggering mechanism (100) configured to engage the second container and including a plurality of fingers (102, 104, 106) extending within the passageway (11) to releasably engage the housing and maintain the second container in a second resting position with the second seal not penetrated by the second spike, the fingers configured to be engaged by the first container when the first container moves past a first activated position with at least a portion of the first spike penetrating the first seal cap to establish fluid communication between the interior of the first container and the flow path, the engagement of the first container to the fingers disengaging the fingers from the housing sufficiently to allow the second container to move toward the first container to a second activated position with at least a portion of the second spike penetrating through the second seal cap to establish fluid communication with the flow path.