Syringe Mechanical Coupling for Chromatography Purity
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Solution Overview
Problem
Existing syringes for laboratory chromatographic applications face issues with contamination due to adhesive connections, which can outgas volatile organic substances when heated, and are not suitable for solvent environments, failing to ensure fluid purity and strength requirements.
Innovation Solution
A syringe design featuring a radially inward recess on the coupling section and corresponding latching sections on the connecting element for a purely mechanical connection, combined with a clamping device for axial prestress, eliminating the need for adhesives and enhancing tightness through a snap-fit mechanism and partial rotation of the connecting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive bonds are used to connect the needle and syringe body, then the connection strength is improved, but contamination of the sample with volatile organic compounds occurs and the adhesive can be damaged by solvents
Solution Approach 1:
The invention extracts and eliminates the adhesive bonding mechanism from the syringe construction. Instead of using adhesive bonds between the needle hub and syringe body, the patent employs a purely mechanical coupling system with a needle hub featuring radial locking elements that engage with corresponding features on the syringe body, completely removing the source of VOC contamination.
Solution Approach 2:
The invention replaces the chemical bonding mechanism (adhesive) with a mechanical bonding system. The needle hub incorporates radial locking elements that mechanically engage with the syringe body through a snap-fit or interference fit mechanism, providing a solvent-resistant, adhesive-free connection that eliminates contamination while maintaining connection strength.
2Stability of the object's composition
If adhesive bonds are used to connect the needle and syringe body, then the connection is formed, but the adhesives can be damaged by solvents in the sample fluid
Solution Approach 1:
The invention removes adhesive materials from the syringe construction entirely, replacing them with a mechanical coupling system. The needle hub and syringe body are connected through radial locking elements and interference fits that provide solvent-resistant bonding, eliminating the vulnerability to solvent damage while maintaining connection integrity.
Solution Approach 2:
The invention employs composite construction with the needle hub made from materials that provide both mechanical strength and chemical resistance. The coupling mechanism combines rigid locking elements with elastomeric sealing components, creating a composite system that maintains integrity in solvent environments while providing secure mechanical connection.
3Strength
If a clamping screw connection is used between the needle and connecting element, then the connection strength is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The invention extracts and eliminates the clamping screw mechanism from the needle-syringe connection system. Instead of requiring threaded fasteners and assembly operations, the patent employs a snap-fit mechanical coupling where radial locking elements on the needle hub automatically engage with corresponding features on the syringe body during a simple push-on assembly operation.
Solution Approach 2:
The mechanical coupling system is designed to be self-assembling without requiring additional fastening operations. The radial locking elements on the needle hub automatically engage with the syringe body when the needle is inserted, providing self-aligning, tool-free assembly that simplifies manufacturing while maintaining connection strength.
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 mechanical connection ensures high-tightness and purity of the fluid, preventing contamination from adhesives and maintaining integrity in solvent environments, suitable for high-temperature chromatography and high-purity applications.
Implementation Method 1
the connecting section parts are deflectable in a radial direction... During axial sliding onto the coupling section, the connecting section parts bear against the coupling section with their locking section parts, deforming or bending radially outward until the locking section parts or locking sections engage in the recess on the coupling section. During this process, the connecting section parts move radially inwards with a snapping motion due to elastic deformation when they engage.
Data Source
Figure 1~3
Figure 4a~5
Figure 6a~6d
AI summary
The invention relates to a syringe, comprising: a syringe body (12) having an axial inner cavity (16), which extends in the direction of a longitudinal axis (LA) of the syringe body (12) and in which a plunger (14) can be or is accommodated in such a way that the plunger can be moved in the longitudinal direction, and a needle (18), which can be or is connected to the syringe body (12) at a longitudinal end of the syringe body (12), wherein the syringe body (12) has a coupling segment (20) at the needle-side longitudinal end of the syringe body (12), to which coupling segment (20) the needle (18) can be or is fastened by means of a connecting element (22) that can be slid on in the longitudinal direction. According to the invention, at least one radially inward cavity (34) is provided on the coupling segment (20), which cavity can be brought into engagement or is in engagement with at least one corresponding locking segment (32) provided on the connecting element (22).