Blood Sampling System with Vibration Control Drive Spring
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Solution Overview
Problem
Existing blood sampling devices cause pain and multiple piercings due to vibrations from the drive spring during the lancing process, and complex mechanisms are required to manage the return phase of the lancet, which complicates the design and affects the puncture depth and speed.
Innovation Solution
A blood withdrawal system with a coaxially arranged drive spring that forms an oscillating system with the lancet, featuring a vibration control device (ROTOCOM) that limits, damps, or shifts the oscillation to prevent multiple piercings, allowing the lancet to maintain high-speed penetration during the propulsion phase while controlling vibrations during the return phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drive spring is coupled to the lancet during the entire lancing movement, then the lancet can be driven simply, but the spring vibration causes multiple piercings and additional pain
Solution Approach 1:
The lancing movement is divided into two distinct phases: propulsion phase where the drive spring couples to the lancet, and return phase where the drive spring decouples from the lancet. This segmentation allows the system to achieve simple driving mechanism while preventing vibration-induced multiple piercings during the return phase.
Solution Approach 2:
The harmful vibration effect is extracted and isolated to the return phase by decoupling the drive spring from the lancet during this phase. The drive spring is removed from the lancet coupling during the return phase, eliminating the source of vibration that causes multiple piercings.
2Object-affected harmful factors
If the drive spring is decoupled during the return phase to prevent vibrations, then multiple piercings are avoided, but the lancet penetration speed decreases
Solution Approach 1:
The lancing movement is segmented into propulsion phase (high speed) and return phase (vibration control). During the propulsion phase, the drive spring is coupled to the lancet to achieve high penetration speed. During the return phase, the drive spring is decoupled to control vibrations and prevent multiple piercings. This temporal segmentation allows both high speed and vibration control to coexist.
Solution Approach 2:
The coupling between the drive spring and lancet is made dynamic rather than static. The coupling occurs during the propulsion phase when high speed is needed, and the decoupling occurs during the return phase when vibration control is needed. This dynamic adjustment of the spring-lancet connection allows the system to optimize performance for each phase independently.
3Ease of operation
If a complex return mechanism is added to manage the lancet return phase, then the return movement can be controlled, but the device complexity increases
Solution Approach 1:
The drive spring itself serves the dual function of propelling the lancet during the propulsion phase and providing the return movement during the return phase. By decoupling the drive spring from the lancet during the return phase, the spring naturally returns to its initial position, automatically propelling the lancet back without requiring additional return mechanisms. This self-service approach maintains simplicity while achieving effective return phase control.
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 system ensures quick and painless lancing with controlled oscillations, preventing multiple piercings and maintaining the simplicity and efficiency of the coaxial spring arrangement, allowing for independent puncture depth setting without additional constructive measures.
Implementation Method 1
The lancet drive has a drive spring which is arranged behind the lancet and is coupled to the lancet during the propulsion phase in such a way that the relaxation movement of the drive spring drives the lancet directly
Implementation Method 2
As a result, energy from the lancet can be transferred back to the drive spring and stored in it. The drive spring, which is tensioned again as a result, can again drive the lancet in the direction of the puncture
Implementation Method 3
a vibration control device (ROTOCOM) that limits, damps, or shifts the oscillation to prevent multiple piercings
Data Source
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AI summary
A blood collection system for taking blood from a body part for diagnostic purposes, comprising a housing (2, 36, 50) with a lancet guide (3) by which a lancet (8, 39, 48) is guided along a predetermined insertion path, and a lancet drive (4) for driving a pricking motion of the lancet (8, 39, 48) along the predetermined insertion path. The pricking motion comprises a thrust phase in the insertion direction and, after reaching a reversal point, a subsequent return phase in the opposite direction of insertion.The lancet drive (4) has a drive spring (5,49) which is arranged behind the lancet (8,39,48) and is connected to the lancet (8,39,48) during the propulsion phase of the pricking movement and drives the lancet (8,39,49) in the pricking direction, wherein it has a vibration control device which acts on a vibrating system enclosing the lancet (8,39,48) and the drive spring (5,49) in such a way that its vibration behavior is changed and thereby prevents the lancet (8,39,48) from repeatedly pricking the body part.