Intraosseous Device Safety Catch and Cannula Stabilization
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Solution Overview
Problem
Intraosseous injection devices suffer from safety issues, such as accidental activation and instability of the cannula after penetration, leading to potential injury to both patients and operators, as well as inefficiencies in drug administration due to cannula instability.
Innovation Solution
The device incorporates a safety catch mechanism that requires a 90° turn and a secondary mechanism that locks activation until the device is properly positioned against the patient's body, along with a setting assembly that stabilizes the cannula post-activation by separating from the main body and remaining on the patient to maintain the cannula's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device is activated without safety mechanisms, then the operation is simple and fast, but accidental activation and reverse direction activation occur causing injury to operator and patient
Solution Approach 1:
The safety catch must be released before the device can be activated, and the trigger is designed to only pull in one direction. These preliminary safety actions are built into the activation sequence, ensuring that accidental or reverse activation cannot occur while maintaining a relatively simple overall device structure.
Solution Approach 2:
The safety catch acts as an intermediary mechanism between the operator and the activation force. It mediates the activation process by requiring a specific release action before the main spring can drive the needle, preventing direct and potentially unsafe activation.
2Reliability
If the device provides stable support to the cannula after penetration, then drug administration is effective, but the device structure becomes more complex
Solution Approach 1:
The device is divided into separate functional modules: the main body containing the spring and trigger mechanism, and a separate setting assembly that remains on the patient's body after penetration. This segmentation allows the cannula support function to be provided by a dedicated component without complicating the main activation mechanism.
Solution Approach 2:
The setting assembly is designed to be separated from the main device body after penetration and left on the patient's body to continue supporting the cannula. This allows the support function to be maintained without requiring the entire device to remain in place, simplifying the overall device structure while ensuring cannula stability.
Data Source
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Figure 3
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AI summary
The invention relates to a device for the insertion of a cannula into a bone of a patient, which comprises: (a) an activator assembly for activating the device; (b) needle assembly which comprises a stylet and cannula; (c) barrel assembly for containing said stylet and cannula in a loaded state prior to the device activation; and (d) a setting assembly for adjusting the penetration depth of said cannula into the patient's bone.