Adjusting Ring Mechanism for Depth-Settable Safety Lancet
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Solution Overview
Problem
Previous disposable puncture depth adjustable safety lancets often experience false triggering when adjusting the puncture depth, leading to product waste due to the connection of the adjusting head with the trigger.
Innovation Solution
The design includes an adjusting ring that is clearance-fitted with the trigger and connected to the shell in a rotational and fixed manner, allowing for gear switching through a rotational locating structure, ensuring that the rotation of the adjusting ring does not trigger the lancet prematurely, thus changing the puncture depth without causing false activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the adjusting head is connected to the trigger to enable puncture depth adjustment, then the adaptability to different skin types is improved, but false triggering occurs during adjustment
Solution Approach 1:
The patent divides the adjusting mechanism from the trigger mechanism by introducing an adjusting ring that rotates independently on the trigger shaft. The adjusting ring with its beveled edge interacts with the lancet core's collision face to control puncture depth, while the trigger button remains separate for activation. This segmentation eliminates the coupling between adjustment and triggering operations, preventing false activation during depth adjustment.
2Manufacturing precision
If the adjusting head is rotated to adjust puncture depth, then the puncture depth control is improved, but the lancet is triggered earlier causing product waste
Solution Approach 1:
The patent introduces a beveled edge on the adjusting ring as an intermediary element between the rotation adjustment and the lancet core. When the adjusting ring rotates, its beveled edge gradually contacts the collision face on the lancet core's side wing, controlling the exposure depth of the needle tip. This intermediary mechanism allows precise depth adjustment without directly triggering the lancet, preventing premature activation and product waste.
3Ease of operation
If the adjusting head is pressed during rotation, then the puncture depth adjustment is achieved, but the trigger is activated by mistake
Solution Approach 1:
The patent implements a dynamic adjusting ring that can rotate freely during depth adjustment and is only locked in place after adjustment is complete. The adjusting ring's rotational movement during adjustment does not activate the trigger, as the trigger mechanism remains independent. This dynamic design allows easy operation for depth adjustment while maintaining reliability by preventing accidental activation during the adjustment process.
Data Source
AI summary
An improved disposable puncture depth adjustable safety lancet includes a shell, a lancet core, a spring, and a trigger. The shell has an adjusting ring at a front end thereof to adjust a puncture depth, the adjusting ring being sleeved and clearance-fit at an outside of the trigger head. The adjusting ring and the shell are rotationally connected in a peripheral direction and are fixedly connected in an axial direction, and a rotational locating structure is formed by the adjusting ring and the shell in the peripheral direction. The adjusting ring has an inner wall equipped with a rotating step face or rotating bevel, and rotating the adjusting ring locates the adjusting ring in different locating positions. The rotating step face or rotating bevel is configured to meet the collision face of the lancet core in different axial positions, thereby changing the puncture depth of needle tip.