Intravitreal Fluid Delivery With Separate Priming and Administration
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Solution Overview
Problem
Existing administration devices for intravitreal fluid delivery are not user-friendly, prone to misapplication, misuse, contamination, incorrect dosing, and air bubble inclusion, and have complex manufacturing processes.
Innovation Solution
A mechanical administration device with a dual-actuation mechanism, featuring a first actuation part for priming and a second actuation part for administering, separated by a 90-degree rotation, ensuring intuitive use and minimizing risks of misuse and incorrect dosing, with a securing member to prevent back-movement and provide haptic feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single actuation mechanism is used for both priming and administering, then the device structure is simpler, but the risk of misapplication and incorrect dosing increases
Solution Approach 1:
The actuation mechanism is divided into two separate parts: a first actuation part for priming and a second actuation part for administering. This segmentation ensures that each function has its own dedicated control, preventing misapplication and incorrect dosing while maintaining clear user guidance through distinct mechanical actions.
2Productivity
If priming and administering are combined in one step, then the operation is faster, but the risk of air bubble inclusion and contamination increases
Solution Approach 1:
The administration process is segmented into two distinct steps: priming (removing air bubbles) and administering (delivering the fluid). The first actuation part performs priming by moving the stopper to a first position, while the second actuation part performs administering by moving the stopper to a second position. This sequential separation eliminates air bubbles before fluid delivery, preventing contamination and harmful inclusions.
3Reliability
If a rotation-locked mechanism is added to separate actuation parts, then the safety against misuse improves, but the device complexity increases
Solution Approach 1:
The second actuation part is configured to rotate relative to the retainer, and a rotation-locked mechanism prevents the first actuation part from being actuated unless the second actuation part is in the correct rotational position. This asymmetric design ensures that only the properly oriented actuation can proceed, protecting against misuse while maintaining intuitive user guidance through distinct mechanical actions.
4Manufacturing precision
If multiple actuation steps are introduced, then the precision of fluid delivery improves, but the ease of operation decreases
Solution Approach 1:
The device incorporates haptic feedback through the rotation-locked mechanism, which provides tactile confirmation when the second actuation part is in the correct position for administering. This feedback ensures that users can intuitively understand the proper sequence of operations without complex instructions, maintaining ease of use while achieving precise fluid delivery through the two-step actuation process.
Data Source
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AI summary
An administration device for intravitreal administration of a fluid is proposed, wherein a second actuation part of the administration device is configured to axially block a plunger rod and/or a first actuation part of the administration device, where in the second actuation part is to be actuated in order to axially release the plunger rod and/or the first actuation part such that the first actuation part can be actuated. The administration device comprises a securing member, wherein the securing member is configured to block a back-movement of the plunger rod and/or the first actuation part at least in an initial position and/or in an administration position of the plunger rod and wherein the securing member is configured to block actuation of the second actuation part before reaching the administration position of the plunger rod.