Introduction to tubing and needles

King Square Technology provides custom inner-wall mirror polishing, precision bending, necking, and spinning of SUS stainless steel tubing across diverse specifications, satisfying critical client requirements for IVD clinical diagnostic sampling needles, reagent probes, and microfluidic transmission systems.

1. High-Precision Inner-Wall Mirror Polishing Technology

In high-throughput automated biochemical and chemiluminescence analyzers, sample probes encounter ultra-trace serum, plasma, reagents, and blood cells. Any micro-fissure, roughness, or burr on the needle's inner surface causes cross-contamination, protein adhesion, and inaccurate dispensing volumes.

King Square implements proprietary mechanical abrasive honing and multi-stage electrochemical finishing processes:

• Super-mirror roughness: The inner surface roughness reaches Ra ≤ 0.1 μm (down to Ra 0.05 μm on request), delivering a glass-smooth fluid path.
• Zero Dead Volume: Ensures uniform fluidic velocity distribution without laminar vortices or stagnant flow zones.
• Trace Carryover Minimization: Carryover rate drops below 0.1 ppm, dramatically exceeding standard clinical diagnostic requirements.

Figure 1: King Square Medical Sampling Needle Precision Processing & Surface Treatment Specifications

2. CNC Spinning, Drawing & Needle Tip Reducing

Through high-precision CNC spinning and progressive drawing techniques, King Square controls wall thickness change below 5% across diameter transitions:

• Outer Diameter Transition: Seamless taper from OD 3.0 mm down to OD 0.35 mm.
• Uniform Wall Thickness: Controlled between 0.10 mm to 0.30 mm without necking defects or micro-cracks.
• Multi-angle Lancet Bevels: Standard 12°, 17°, 30°, and 45° piercing tips, pencil points, and closed-tip side-dispensing holes to pierce blood tube septa cleanly without coring rubber fragments.

Figure 2: Needle Tip Piercing Profiles, Side Holes, and Dimensional Control

3. Coaxial Double-Lumen & Liquid Level Detection Needles

King Square specializes in integrating complex sensing functions into medical needle assemblies:

• Capacitive & Pressure Liquid Level Detection: High-sensitivity gold-plated or silver-plated electrical connectors with shielded coaxial grounding for sub-millimeter meniscus sensing.
• Coaxial Double-Lumen & Multi-Lumen Needles: Concentric inner and outer tubes allowing simultaneous liquid aspiration and air sheath dispensing, or dual reagent pre-mixing.
• Constant Temperature Heated Needles: Built-in heating elements maintaining reagents at a stable 37.0 ± 0.2°C during transfer.

Figure 3: Capacitive Level Detection Integration and Inner Wall Mirror Finish Comparison

Figure 4: Custom Coaxial Reagent Needles, Multi-Lumen Assemblies, and Surface Coatings

4. Technical Specifications Table