Rotation-Lock Protection Cap for Lancet Cartridge Safety
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Solution Overview
Problem
Conventional puncture needle cartridges can lead to inadequate hold between the lancet body and the puncture device, resulting in improper puncturing depth and potential exposure of the needle, increasing the risk of needle-stick accidents when the protection cap is removed prematurely.
Innovation Solution
The puncture needle cartridge design includes a protection cap that can only be removed after a predetermined rotation, ensuring the cap is fully disengaged from the lancet body, thus maintaining a secure hold and preventing accidental exposure of the needle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the protection cap is made separable from the lancet body, then the protection cap can be removed after use, but the cap may be removed prematurely before proper rotation, causing inadequate hold and needle exposure
Solution Approach 1:
The patent implements a rotation mechanism that requires the protection cap to be rotated by a predetermined angle before it can be removed from the lancet body. This preliminary rotation action ensures that the cap is intentionally and properly removed only after the user has completed the required rotational movement, preventing premature removal and maintaining adequate hold between the lancet body and puncture device throughout the procedure.
2Ease of operation
If the protection cap is removed while not fully torn from the lancet body, then the cap can be partially removed, but the adequate hold is lost and the needle may be exposed
Solution Approach 1:
The rotation mechanism requires complete rotational movement before the cap can be detached from the lancet body. This preliminary action ensures that the cap is either fully attached or fully removed, eliminating the intermediate state where partial removal could occur and cause needle exposure.
Solution Approach 2:
The patent introduces a rotation mechanism as an intermediary step between the attached and removed states of the protection cap. This intermediary mechanism controls the transition process, ensuring that the cap can only be removed after the predetermined rotation is completed, thereby preventing premature or partial removal that could lead to needle exposure.
3Productivity
If the protection cap is designed to be easily removable, then the cap can be taken off quickly, but the hold between grip part and plunger may be lost
Solution Approach 1:
The rotation mechanism serves as a preliminary action that must be completed before the cap can be removed. While this adds a rotational step to the removal process, it ensures that the hold between the grip part and plunger is maintained throughout the procedure, as the cap remains attached during the rotation and only detaches after the rotation is complete and the hold is confirmed to be adequate.
Data Source
AI summary
A puncture device to which a lancet having a protection cap is installed, where the protection cap can be reliably removed from the lancet with the lancet appropriately held by the puncture device. A first projection or recess is formed in the protection cap, and a second projection or recess is formed in the puncture device. When the protection cap is not rotated a predetermined angle about the axis of the lancet, the first projection or recess and the second projection or recess are engaged with each other to restrict the movement of the protection cap in the direction of the axis of the lancet. Further, when the protection cap is rotated the predetermined angle about the axis of the lancet, the engagement between the first projection or recess and the second projection or recess is released to allow the protection cap to move in the direction of the axis of a lancet body. Also, the protection cap having been rotated the predetermined angle about the axis of the lancet is separated from the lancet.