Blood Sampling Device Sealing Mechanism
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Solution Overview
Problem
Existing blood sampling devices face issues with blood leakage during transportation and storage, especially under negative pressure conditions, due to deformation of sealing components and incomplete sealing states.
Innovation Solution
A pipette tip-shaped blood sampling device with a cylindrical container and a cap piston-shaped sealing cap, featuring a tapered blood holding part and offset locking and screw parts, which allows for secure sealing and prevention of blood leakage by ensuring proper engagement and contact between the cap and container components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a projection is provided on the bottom cap to seal the bottom opening of the sample collecting device, then sealing performance is improved, but the projection is likely to deform during transportation, causing incomplete sealing and blood leakage
Solution Approach 1:
The sealing function is divided into two independent parts: a projection on the bottom cap and a recess on the bottom of the storage device. This segmentation allows each part to contribute to sealing without bearing the full sealing load alone, reducing deformation risk.
Solution Approach 2:
The recess on the bottom surface of the storage device acts as an intermediary element that receives and protects the projection during assembly and transportation. The recess guides the projection into proper alignment and distributes contact forces, preventing projection deformation while maintaining effective sealing.
2Ease of operation
If the sample collecting device is placed in the test sample storage device before blood collection, then transportation and storage are simplified, but the tip of the sample collecting device may be deformed, causing incomplete sealing
Solution Approach 1:
The sample collecting device is nested within the storage device in a configured state where the tip is positioned away from the bottom cap. This nested arrangement allows compact transportation while preventing tip deformation through proper spatial positioning and protection by the storage device structure.
3Reliability
If the projection is in close contact with the bottom opening to ensure sealing, then sealing is improved, but under negative pressure the projection may not maintain proper contact, causing blood leakage
Solution Approach 1:
The sealing system combines the projection structure with the recess structure to create a composite sealing mechanism. This composite design provides both initial contact sealing and sustained sealing under negative pressure conditions, as the recess maintains proper alignment and contact force on the projection.
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 device effectively prevents blood leakage by ensuring complete sealing of the blood sampler's openings during storage and transportation, even under negative pressure, thereby ensuring safe and easy handling and analysis of collected blood samples.
Implementation Method 1
blood is aspirated into the internal space by the capillary action when the bottom opening is brought into contact with blood
Data Source
AI summary
An exemplary blood sampling device can be provided that can collect a small amount of blood and prevent blood leakage. The exemplary blood sampling device can comprise a pipette tip-shaped blood sampler having an internal space for aspirating and holding blood by the capillary action and having openings at the top and bottom, a cylindrical container capable of accommodating the blood sampler and a cap piston-shaped sealing cap for sealing the container, wherein a receiving part is provided at the bottom of the container and a locking part and a screw part are provided on the upper outer side of the container, and a mandrel extending from the inner upper surface of the sealing cap is provided and a projection and a screw part are provided on the inner side surface of the sealing cap.