Capillary Draining Aid With Deformable Compression Section
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Solution Overview
Problem
Existing pipetting devices face challenges such as premature liquid loss, additional manufacturing steps, and contamination risks due to complex assembly and separate components, particularly with the gas exchange unit.
Innovation Solution
A pipetting device with a cylindrical capillary tube and a one-piece tube holder featuring a deformable compression section, integrated channel and radially widened sections, and a fluid stop that is impermeable to liquids but permeable to gases, allowing for secure attachment and reduced risk of contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate gas exchange unit is attached to the pipe section, then gas exchange function is provided, but assembly complexity increases and risk of liquid leakage occurs
Solution Approach 1:
The gas exchange unit is integrated directly into the tube holder as a single molded piece, eliminating the separate attachment step. The tube holder includes both the liquid-tight channel section and the gas exchange unit with its opening, forming one monolithic structure that prevents liquid leakage while simplifying assembly.
2Productivity
If a piston is used to move within the main body, then liquid dispensing function is achieved, but manufacturing complexity increases due to separate component assembly
Solution Approach 1:
The piston function is integrated into the tube holder structure itself. The tube holder includes a compression section that can be deformed to move the piston, eliminating the need for a separate piston component. This allows the entire liquid dispensing mechanism to be manufactured as a single piece, reducing manufacturing complexity while maintaining dispensing efficiency.
3Volume of moving object
If the common volume of connecting section and radially expanded section is reduced, then device size is minimized, but gas exchange capacity may be compromised
Solution Approach 1:
The tube holder features a radially expanded section with a large opening specifically designed for gas exchange, while the connecting section maintains minimal volume. The gas exchange unit is localized with enhanced dimensions (radial expansion) only where needed for its function, while other sections remain compact. This allows the device to maintain small overall size while ensuring adequate gas exchange capacity through localized volume optimization.
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 simplifies production, enhances user safety, and reduces the risk of contamination by eliminating the need for separate components and complex assembly, while ensuring secure fluid handling and efficient sample collection and dispensing.
Implementation Method 1
the liquid is drawn into the capillary tube by negative pressure or capillary action
Implementation Method 2
a compression section, designed to reduce the overall volume, which is deformable in the longitudinal direction of the tube holder
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a pipetting device (1) for receiving and dispensing medical samples, for example body fluids, comprising a cylindrical capillary tube (3) and a tube holder (2), wherein the tube holder (2) consists of: - a channel section (5) for receiving the capillary tube (3), - a radially expanded section (10) which is provided with an opening (11) facing away from the channel section (5), - a connecting section (6) which forms a flow connection between the channel section (5) and the radially expanded section (10), wherein the common volume of the connecting section (6) and the radially expanded section (10) is a multiple of the capillary volume enclosed by the capillary tube (3) and is reducible.In order to provide a pipetting device that can be manufactured with low production costs, which facilitates handling and increases safety for the user, it is proposed according to the invention that the tube holder (2) is provided with a compression section (12) which is reversibly deformable in the longitudinal direction of the tube holder (2) to reduce the common volume and which is integral with the connecting section (6) and with the radially expanded section (10).