Injection Adapter Retaining Device for Container Stability
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Solution Overview
Problem
The handling of containers in injection and infusion devices is awkward, and there is a risk of air being sucked into the container or the product being expelled during the connection of the plunger to the plunger rod, due to displacement of the plunger within the container.
Innovation Solution
An adapter that creates a product connection between a catheter and a container, featuring a thread for screwing onto the appliance, a stop for fixing the container, a catheter attachment piece, and a product channel, with a retaining device to secure the container against twisting and displacement, allowing for easier and safer insertion without direct handling of the container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the container is handled directly during insertion and plunger connection, then the user can perform the operation, but the handling becomes awkward and there is a risk of air being sucked into the container or product being expelled
Solution Approach 1:
The patent introduces an adapter as an intermediary device between the user's hand and the container. The adapter includes a retaining device that securely holds the container during insertion and plunger connection operations. This mediator allows the user to manipulate the adapter rather than directly handling the container, thereby preventing accidental plunger displacement while maintaining ease of operation. The adapter acts as a buffer that isolates the container from direct user interaction during critical operations.
2Stability of the object's composition
If the container is secured to the adapter with anti-twist protection, then the container position is stabilized, but the device structure becomes more complex
Solution Approach 1:
The patent employs asymmetric features on both the adapter and container to prevent twisting. Specifically, the adapter includes asymmetric retaining elements that engage with corresponding asymmetric features on the container. This asymmetric design creates a mechanically locked configuration that stabilizes the container position and prevents rotation during insertion and plunger connection. The asymmetric features are integrated into the overall adapter structure rather than being separate components, thereby achieving stability without excessive complexity.
3Reliability
If the plunger is screwed onto the plunger rod during container insertion, then the connection is secured, but the plunger may be displaced within the container causing air suction or product expulsion
Solution Approach 1:
The patent implements preliminary action by having the adapter's retaining device secure the container in place before the plunger is screwed onto the plunger rod. The retaining device is designed to hold the container stationary during the entire insertion process, including the plunger connection operation. This preliminary securing action prevents any accidental displacement of the plunger within the container during the screwing operation, thereby eliminating the risk of air suction or product expulsion while maintaining a smooth insertion process.
Data Source
AI summary
An adapter for use with an appliance for administering an injectable product, the adapter serving to create a product connection between a catheter and a product container that can be inserted into the appliance, and including a thread for screwing the adapter to the appliance, a stop for fixing the container in the longitudinal direction of the thread, an attachment piece to which the catheter may be connected, and a product channel that extends through the attachment piece and the thread.