Lancing Device Dual Spring Carriage Oscillation Control
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Solution Overview
Problem
Existing lancing devices with dual spring elements for accelerating and restoring the lancet holder often require complex constructions and oscillate excessively, making them difficult to operate and prepare for subsequent lancing operations.
Innovation Solution
A lancing device with a drive mechanism featuring a carriage unit comprising a spring-tensioning carriage part and a lancing carriage part, where the spring-tensioning carriage part is manually pre-tensionable to reduce the lancing spring element receiving region, allowing for simple preparation and minimizing oscillation by using two separate spring elements for forward and backward movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual spring element system is used to accelerate and restore the lancet holder, then the lancing operation can be performed effectively, but the device construction becomes complex and excessive oscillation occurs
Solution Approach 1:
The drive means is segmented into two functionally independent spring elements: a lancing spring element for accelerating the lancet holder in the lancing direction, and a restoring spring element for accelerating it counter to the lancing direction. This segmentation allows each spring to be optimized for its specific function while simplifying the overall construction and reducing oscillation issues
Solution Approach 2:
The lancing spring element is pre-tensioned within its receiving region by translational displacement of the spring-tensioning carriage part relative to the lancing carriage part before the lancing operation. This preliminary action ensures the spring is properly prepared for the forthcoming operation, eliminating the need for complex adjustment mechanisms during operation
2Ease of operation
If the spring-tensioning carriage part is made manually movable from outside the device, then pre-tensioning becomes simple and operability improves, but the device structure becomes more complex
Solution Approach 1:
The spring-tensioning carriage part serves multiple functions: it holds the lancing spring element, allows manual pre-tensioning from outside the device, and provides the receiving region for the spring. This multi-functionality reduces the need for separate adjustment mechanisms and simplifies the overall device structure
Solution Approach 2:
The carriage unit is designed with nested components where the spring-tensioning carriage part and lancing carriage part are arranged to be displaceable in translation relative to one another, with receiving regions for both spring elements. This nested arrangement allows compact construction while maintaining ease of pre-tensioning operation
3Stability of the object's composition
If separate spring elements are used for forward and backward movements, then oscillation is minimized and reliability improves, but the device complexity increases
Solution Approach 1:
The drive means is divided into two separate spring elements with distinct functions: the lancing spring element for forward acceleration and the restoring spring element for backward acceleration. This segmentation eliminates the oscillation problems associated with single-spring systems while maintaining simple series connection that minimizes structural complexity
Solution Approach 2:
The carriage unit acts as an intermediary structure that houses both spring elements in their respective receiving regions and manages their interaction with the lancet holder. This intermediary structure simplifies the arrangement of the two spring elements and reduces overall device complexity
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 solution simplifies the design and operation of the lancing device, reducing oscillation and enabling easy pre-tensioning of the lancing spring element, ensuring a high spring force for effective lancet operation while minimizing component complexity and enhancing ergonomic handling.
Implementation Method 1
a lancing spring element for accelerating the lancet holder in the lancing direction
Implementation Method 2
a restoring spring element for accelerating the lancet holder counter to the lancing direction
Data Source
AI summary
A lancing device comprising a lancet holder for holding an exchangeable lancet and comprising a drive element for driving the lancet holder. The drive element has two spring elements comprising a lancing spring element for accelerating the lancet holder in the lancing direction and a restoring spring element for accelerating the lancet holder counter to the lancing direction. The drive element has a carriage unit with a spring-tensioning carriage part and a lancing carriage part, and the spring-tensioning carriage part and the lancing carriage part are arranged to be displaceable in translation relative to one another and form a lancing spring element receiving region and a restoring spring element receiving region. The lancing spring element receiving region can be reduced by translational displacement of the spring-tensioning carriage part relative to the lancing carriage part, in order to pre-tension the lancing spring element within the lancing spring element receiving region.