Rotating Cartridge Blocking Mechanism for Injection Pen Safety
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Solution Overview
Problem
Existing devices for administering fluid products, such as injection pens, often face issues with unintentional or premature actuation, which can lead to unsafe administration of medications, especially when using two-chamber carpules where the medication may not be fully mixed.
Innovation Solution
A device for administering a fluid product that includes a housing, an actuating element, a receiving device for the fluid product, and a blocking device. The receiving device is rotatably mounted relative to the housing, allowing the blocking device to be moved from a blocking position to a release position by rotating the receiving device. This design prevents accidental actuation until the medication is fully mixed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking device is added to prevent accidental actuation, then safety is improved, but device complexity increases
Solution Approach 1:
The blocking device is integrated with the receiving device assembly, where the blocking element is combined with the cartridge holder or cap structure. This merging approach allows the blocking function to be achieved without adding a completely separate mechanism, thus improving safety while minimizing the increase in device complexity.
Solution Approach 2:
The blocking device serves multiple functions: it prevents accidental actuation, indicates ready-to-use status, and can be integrated with the cartridge retention mechanism. By designing the blocking element to perform multiple roles within the existing structure, the patent achieves enhanced safety without proportionally increasing device complexity.
2Reliability
If the receiving device is rotatably mounted to enable blocking mechanism, then safety is improved, but ease of operation deteriorates
Solution Approach 1:
The blocking position is automatically established when the receiving device is attached to the housing, eliminating the need for separate blocking actions. The rotational mounting allows the blocking mechanism to be engaged as a preliminary step during the normal assembly process, ensuring safety without adding operational steps that would reduce ease of use.
Solution Approach 2:
The rotatable receiving device provides a dynamic blocking mechanism that can transition between blocked and unblocked states through natural handling motions. The rotational degree of freedom allows the blocking element to be moved out of the blocking position during normal cartridge insertion or removal actions, maintaining ease of operation while ensuring safety when needed.
3Reliability
If a blocking device is implemented, then premature actuation is prevented, but manufacturing complexity increases
Solution Approach 1:
The blocking function is segmented into a separate blocking element that can be independently manufactured and then integrated with the receiving device. This segmentation allows the blocking component to be produced using standard manufacturing processes and assembled into the final device, preventing premature actuation without significantly increasing overall manufacturing complexity.
Solution Approach 2:
The blocking element is nested within or integrated with the receiving device structure, allowing both components to be manufactured and assembled in a compact configuration. This nesting approach enables the blocking mechanism to be incorporated into the existing device architecture without requiring separate manufacturing lines or complex assembly processes.
Data Source
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AI summary
The invention relates to an apparatus for administering a fluid product, comprising a housing (1) for accommodating an administering mechanism, an actuation element (6) for actuating the administering mechanism, a receptacle (2) for holding the fluid product, and a blocking device (5, 23) for blocking the actuation element. The receptacle (2) is mounted so as to be rotatable relative to the housing. The blocking device can be moved from a blocking position into a releasing position by rotating the receptacle relative to the housing.