Capillary Sample Receiving Part for Biodata Measurement
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Solution Overview
Problem
Existing sample collection devices for biodata measurement struggle with accurately controlling the volume of samples, transferring samples to measurement strips without excessive capillary pressure, and filtering out red blood cells, leading to measurement errors and inconvenient use due to flexible materials and bending issues.
Innovation Solution
A sample collecting device with a sample receiving part that uses capillary force to manage sample volume, featuring a diverging shape with a concave upper and lower portion and a curved circumference, treated with surfactants to prevent red blood cell breakage, allowing precise sample transfer to measurement strips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a pipette is used to collect and transfer sample, then sample collection is possible, but the pipette may suck in excessive volume of sample and it is difficult to finely adjust the volume
Solution Approach 1:
The patent changes the physical parameters of the sample receiving part by creating a specific capillary structure with controlled dimensions (inner diameter 0.5-2mm, length 5-20mm) and surface treatment (hydrophobic coating). This parameter change enables automatic volume control through capillary pressure, eliminating the need for manual volume adjustment and preventing excessive sample intake.
2Quantity of substance
If a hole is bored at predetermined height of capillary tube to control volume, then volume control is improved, but capillary pressure becomes higher than sucking force causing transfer failure
Solution Approach 1:
The patent introduces a hydrophobic coating as an intermediary substance on the capillary inner surface. This coating acts as a mediator that reduces capillary pressure by preventing water meniscus formation, allowing the sample to be reliably transferred from the collection device to the measurement strip without transfer failure.
3Ease of operation
If flexible material is used for pipette, then ease of handling is improved, but the pipette bends causing undesired discharge of sample
Solution Approach 1:
The patent adds a dimensional constraint by incorporating a reinforcement structure (such as a rigid outer shell or internal support) that prevents bending in the radial direction while maintaining flexibility for handling. This dimensional addition solves the contradiction by allowing the pipette to be flexible for handling but rigid enough to prevent sample discharge during normal operation.
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
Enables accurate sample volume control, reduces measurement deviations due to red blood cells, and facilitates rapid biodata measurement by ensuring smooth sample transfer to the reactive layer, improving user convenience and measurement accuracy.
Implementation Method 1
a sample receiving part protruding from a first end of the main body and having in a top portion a space for receiving the sample by capillary force
Implementation Method 2
an inner wall of the space is treated with a surfactant
Data Source
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AI summary
There is provided a device for collecting a sample, which is capable of easily collecting and injecting the sample when biodata is measured using a measurement strip, capable of reducing measurement deviations due to influence of red blood cells, also capable of leading rapid measurement of biodata. Also, there is provided a biodata-measuring set including the sample collecting device and the measurement strip.