Blood Lancing Device Automatic Lancet Ejection Mechanism
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Solution Overview
Problem
Conventional blood lancing devices require manual operation for multiple skin pricking, making them inconvenient for repeated use and difficult to handle due to their small size.
Innovation Solution
A blood lancing device with a housing unit, cap, lancet holder, first and second biasing members, and a transmission assembly that allows for automatic movement of the lancet between trigger and pricking positions, enabling repeated skin pricking with minimal user effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual operation is used for repeated skin pricking, then the device can be operated, but the ease of operation deteriorates due to difficult manual handling
Solution Approach 1:
The device uses a spring-loaded mechanism that automatically propels the lancet forward when the trigger is activated. The spring is pre-compressed and stores potential energy, which is converted to kinetic energy to drive the lancet through the skin, eliminating the need for complex manual manipulation during the pricking action itself.
Solution Approach 2:
The spring is pre-compressed before use, storing energy in advance. The lancet is loaded into the device beforehand, and the entire mechanism is prepared for immediate action. When the trigger is pulled, the pre-compressed spring immediately propels the lancet forward without requiring additional manual manipulation during the critical pricking moment.
2Volume of moving object
If the device size is reduced for portability, then the convenience of carrying is improved, but the ease of operation deteriorates due to difficulty in performing manual operations on miniature devices
Solution Approach 1:
The spring-loaded mechanism performs the pricking action automatically once triggered, eliminating the need for complex manual manipulation. This allows the device to be miniaturized while maintaining ease of use, as the user only needs to press a simple trigger button rather than manually operate intricate mechanisms.
Solution Approach 2:
The complex manual manipulation required in larger devices is replaced by a simple spring-loaded mechanical system that automatically performs the pricking action. This substitution allows for device miniaturization while preserving operational simplicity.
3Productivity
If a spring-loaded mechanism is used for automatic lancet ejection, then the productivity is improved by enabling repeated pricking, but the device complexity increases
Solution Approach 1:
The spring-loaded mechanism automatically propels the lancet forward when triggered, enabling rapid repeated pricking without requiring complex manual manipulation for each stroke. The spring is re-compressed automatically after each discharge, allowing the device to be ready for immediate reuse.
Solution Approach 2:
The device is designed for periodic operation where the spring is compressed, discharged, and re-compressed in a repeating cycle. This periodic action pattern enables efficient repeated pricking operations, with each cycle consisting of loading, firing, and resetting phases.
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 facilitates easy and repeated skin pricking operations with automatic movement of the lancet, reducing user anxiety and improving convenience by eliminating the need for manual operation.
Implementation Method 1
a first biasing member disposed between the holder and the positioning portion for biasing the holder to move along the axis away from the positioning portion
Implementation Method 2
a second biasing member disposed between the cap and the housing unit for biasing the cap to move from the retracted position toward the initial position
Data Source
AI summary
A blood lancing device includes a housing unit and a cap. When the cap is disposed at an initial position, a second drive element is blocked by a first drive element from forward movement relative to the first drive element. When the cap is moved from the initial position to a retracted position, the first drive element pushes the second drive element so that the second drive element is deviated from the first drive element when a holder holding a lancet is moved to a trigger position, thereby allowing for a high speed movement of the holder from the trigger position to a pricking position by virtue of biasing action of a first biasing member.