Reusable Blood Lancing Device with Spring Tensioning Lock
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Solution Overview
Problem
Generic lancing devices are typically designed for single use and require re-tensioning of drive springs for repeated use, making them inconvenient and prone to unintentional displacement during the tensioning process.
Innovation Solution
A lancing device with a tensioning mechanism that includes means for axially locking and working to facilitate the re-tensioning of a drive spring, using a combination of spiral springs and a cam track system to ensure reliable and controlled tensioning, preventing unintended movement and allowing for multiple uses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lancing device is designed for single use, then the device structure is simple, but the device cannot be reused requiring disposal after one use
Solution Approach 1:
The tensioning mechanism pre-locks the drive spring in a tensioned state before use, and includes means to maintain this tensioned state across multiple uses. The locking mechanism is pre-configured to automatically secure the spring, eliminating the need for re-tensioning operations between uses and enabling repeated use without additional complexity.
2Adaptability or versatility
If manual retensioning is required for repeated use, then the device can be reused, but the operation becomes complicated and time-consuming
Solution Approach 1:
The tensioning mechanism is designed to automatically maintain the drive spring in a tensioned state through self-locking features. The mechanism includes means that automatically secure the spring tension without requiring user intervention, making the device ready for repeated use immediately after a single initial tensioning operation.
3Reliability
If the drive spring is tensioned manually without locking means, then the device structure is simple, but unintentional displacement occurs during tensioning
Solution Approach 1:
A locking mechanism serves as an intermediary component between the drive spring and the housing. This locking means secures the spring in a tensioned state by engaging with corresponding features on the spring and housing, preventing unintentional displacement while adding minimal structural complexity through a dedicated locking feature.
4Manufacturing precision
If the lancing device lacks a tensioning mechanism with locking means, then the device is simpler, but the lancing depth becomes inconsistent
Solution Approach 1:
The tensioning mechanism pre-sets the drive spring to a precise tensioned state using locking means that secure the spring at a predetermined position. This preliminary action ensures consistent lancing depth by maintaining identical spring tension across multiple uses, with the locking features preventing any variation in spring pre-load that would affect penetration consistency.
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 enables easier and more reliable conversion of the lancing device to a tensioned state, ensuring consistent performance and reducing user discomfort by maintaining a constant penetration depth and minimizing oscillation, thus enhancing user experience and device reliability.
Implementation Method 1
the displaceable holding device is actuated by means of a spring force of a drive spring
Implementation Method 2
the means for performing work have spring elements, preferably two spiral springs
Data Source
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AI summary
The invention relates to a pricking device (1) for taking a blood sample, comprising a movable holding device (5) for pricking means (4), means (12) for driving the movable holding device and a release device (19) for releasing the pricking movement (13) of the pricking means. When the release device has been manually actuated, the movable holding device can be axially moved by a spring force of a drive spring (9) of the drive means (12), and a tensing device (22) for tensing the drive spring. Said tensing device comprises a tensing mechanism (23) comprising means (24) for axially stopping the movable holding device during the tensing of the drive spring and means (25) for working during the tensing of the drive spring enabling said pricking device to be comfortable to use even when being used several times.