Adjustable Lancet Spring Assembly for Stable Low-Pain Puncture
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Solution Overview
Problem
Existing lancet devices struggle to simultaneously meet the needs of low pain and sufficient blood volume for individuals with different skin types, and often experience needle jitter during puncture, complicating the adjustment of puncture depth.
Innovation Solution
A lancet device with a needle seat, driving core, driving spring, and elastic force adjustment unit that allows for adjustable trigger elastic force and puncture depth, reducing needle jitter and pain through separate components and elastic force adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same elastic force is used for all skin types, then the structure is simple, but it cannot simultaneously meet the needs of low pain and sufficient blood volume
Solution Approach 1:
The patent applies the dynamics principle by making the elastic force adjustable through a spring assembly that can be configured in different states. The spring can be compressed to different degrees or replaced with springs of different force constants, allowing the device to adapt to different skin types (thick/thin, sensitive/insensitive) while maintaining a relatively simple overall structure. This transforms a static elastic force system into a dynamic one that can be adjusted based on user needs.
2Manufacturing precision
If the puncture depth is adjusted by changing the gap between the blocking surface and head cap housing, then the puncture depth can be controlled, but the structure becomes complicated
Solution Approach 1:
The patent applies segmentation by separating the puncture depth control function from the elastic force adjustment function. The puncture depth is controlled by the needle seat's position relative to the needle outlet hole, while the elastic force is controlled by the spring assembly. This segmentation allows each function to be optimized independently, simplifying the overall structure compared to adjusting both parameters through a single complex mechanism.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the spring assembly and needle seat position during device assembly. The puncture depth is determined by the initial positioning of the needle seat on the driving core, and the elastic force is set by pre-compressing the spring or selecting an appropriate spring constant. This eliminates the need for complex real-time adjustment mechanisms during operation.
3Object-affected harmful factors
If the blood taking needle jitters during puncture, then the structure is simple, but the pain increases and blood volume may be insufficient
Solution Approach 1:
The patent applies beforehand cushioning by using the elastic force from the spring assembly to provide a controlled, gradual puncture action. The spring's elastic force cushions the impact during needle insertion, reducing jitter and pain. The elastic force is calibrated to ensure smooth needle delivery without excessive vibration or shock to the user's skin.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides adjustable puncture depth and elastic force, enhancing user comfort by minimizing pain and ensuring sufficient blood volume collection.
Implementation Method 1
a driving spring for providing a trigger elastic force for the driving core
Implementation Method 2
an elastic force adjustment unit for adjusting the axial distance between the two ends of the driving spring to adjust the magnitude of the trigger elastic force
Data Source
AI summary
Disclosed is a lancet device including: a body, having a first end and a second end; a head cap, wherein the first end of the head cap is provided with a needle outlet hole, and the second end of the head cap is connected to the first end of the body; a tail cap, wherein the first end of the tail cap is connected to the second end of the body, and the tail cap is provided with a first spring connecting portion, or the first spring connecting portion is provided in the tail cap; a needle core assembly, at least a part of which is axially guided and located in the body, wherein the needle core assembly includes a needle seat and a blood taking needle, the blood taking needle is provided on the needle seat, and the needle tip of the blood taking needle is adapted to extend out from the needle outlet hole; a trigger assembly, having a driving core acting on the needle seat, wherein the driving core is adapted to drive the needle seat to move toward the needle outlet hole based on a trigger operation, and the driving core is provided with a second spring connecting portion; a driving spring, the both ends of which respectively abut against or are connected with first and second spring connecting portions, wherein the driving spring is located between the first and second spring connecting portions; and an elastic force adjustment unit for adjusting the axial distance between the first and second spring connecting portions to adjust the trigger elastic force of the driving spring.