Blood Lancing Device Curved Cam Track Kinematics
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Solution Overview
Problem
Existing lancing devices for blood sampling often cause discomfort and risk of re-puncturing due to vibration and pain associated with the lancing movement, as they require complex coupling devices and non-linear movement paths that increase mass acceleration and deceleration.
Innovation Solution
A lancing device with a displaceable holding device guided by a linear guide and driven by a spring mechanism, featuring an endless curved cam track that simplifies movement kinematics, allowing the holding device to move in a single direction, reducing vibration and pain by eliminating oscillation and ensuring a smooth, quick lancing movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If complex coupling devices and non-linear movement paths are used in lancing devices, then the lancing mechanism can be achieved, but vibration and pain increase due to mass acceleration and deceleration
Solution Approach 1:
The patent employs a curved cam track instead of a linear guide path. The cam track's curved geometry converts rotational motion into the required linear lancing motion while maintaining smoother acceleration and deceleration profiles, reducing vibration and discomfort during the lancing process.
Solution Approach 2:
The patent introduces a cam mechanism as an intermediary between the driving force and the lancing needle. The cam track and cam follower convert rotational motion into controlled linear motion, acting as a mediator that smooths out acceleration and deceleration forces, thereby reducing vibration and pain.
2Ease of operation
If additional coupling devices are used to achieve lancing movement, then the lancing function is achieved, but the mass to be accelerated and decelerated increases, causing more vibration and pain
Solution Approach 1:
The patent extracts and eliminates unnecessary coupling devices from the lancing mechanism. By using a direct cam-driven system, it removes intermediate components that would add mass, thereby reducing the amount of mass that needs to be accelerated and decelerated during lancing.
Solution Approach 2:
The curved cam track design allows for a more efficient transmission of force with fewer components. The curvature enables direct conversion of rotational to linear motion, reducing the need for additional coupling devices and minimizing the moving mass involved in the lancing action.
3Device complexity
If the holding device is directly engaged in the curved path of the drive means, then the structural design is simplified and the device can be built flatter, but the lancing movement must be achieved with reduced mass acceleration
Solution Approach 1:
The patent uses a curved cam track that the holding device engages directly. This curved path design simplifies the overall structure by eliminating the need for separate coupling mechanisms while the smooth curvature ensures gentle acceleration and deceleration, maintaining lancing comfort.
Solution Approach 2:
The patent merges the holding device directly with the cam track engagement system. By combining these functions into a single integrated mechanism, the structural design is simplified and flattened, while the cam track's geometry ensures smooth motion that reduces vibration and pain.
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 a more comfortable and efficient blood sampling process with reduced lancing pain and risk of re-puncturing, as the curved cam track facilitates a uniform drive movement and minimizes additional coupling devices, resulting in a faster and more precise lancing action.
Implementation Method 1
the displaceable holding device is driven by a spring mechanism
Data Source
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Figure 7
AI summary
The invention relates to a pricking device (1) for taking a blood sample, comprising a movable holding device (10) for pricking means (5), a linear guide element (11) for guiding the movable holding device, means (12) for driving the movable holding device and a release device (31) for releasing the pricking movement (6) of the pricking means. When the release device has been manually actuated, the movable holding device can be moved in a translatory manner by the drive means. Said drive means comprise a curved path (20) in which the movable holding means is directly engaged, enabling the pricking device to have a particularly simple structure.