Stainless Steel SUS304 Cold Drawn Capillary Tube For High Precision Medical Instruments

Stainless Steel SUS304 Cold Drawn Capillary Tube For High Precision Medical Instruments

The medical stainless steel capillary tube refers to an ultra-precise, small-diameter tubular product made from Austenitic Stainless Steel Medical Grade SUS304 (AISI304). It is manufactured via a cold drawing process to achieve exceptional dimensional accuracy, superior surface finish, and enhanced mechanical properties. The capillary tubes’ outer diameter sizes range from 10 gauge(3.4mm) to 34 gauge(0.18mm). The minimum outer diameter that we can achieve is 0.15mm. These medical stainless steel capillary tubes are generally cut into 2 meter or other fixed length according to clients’ requirements. Our factory has certified with ISO13485 Certificate and can provide both medical capillary tubes and needle tubes.

Key Advantages Of SS Capillary Tubes:

• Biocompatibility: SUS304 is a chromium-nickel stainless steel offering excellent resistance to bodily fluids.
• High Precision & Consistency: Cold drawing and strict process control yield tubes with near-perfect dimensional uniformity.
• Superior Surface Finish: A smooth, defect-free interior is crucial for fluid flow, preventing clotting, and ensuring accurate dosing. A flawless exterior aids in discomfort reduction during insertion.
• Enhanced Mechanical Properties: The cold work hardening during drawing increases tensile strength, yield strength, and hardness, providing necessary rigidity for penetrating tissue.
• Corrosion Resistance: Excellent general corrosion resistance, suitable for saline, and exposure to atmospheric conditions.
• Formability & Weldability: Despite being hardened, SUS304 can still be carefully bent, flared, and welded (e.g., laser welding) to create complex medical device assemblies.

Main Applications:

A. Medical & Surgical Applications (Primary Market):

• Hypodermic Needles: The core application for18-34 gauges .
• IV Catheters: Outer sheaths and inner stylets. 
• Biopsy Needles: For tissue sampling (e.g., core biopsy, fine needle aspiration).
• Surgical Instruments: Components for laparoscopic tools, endoscopic instruments, guide wires, cannulas, and orthopedic drill guides.
• Implantable Device Components: Housing for fluid delivery ports, micro-pumps, and neural probes.
• Dental Instruments: Syringe tips and air/water spray nozzles.
• Ophthalmic Surgery: Micro-tubing for vitreoretinal instruments.

B. Non-Medical Applications:

• Chromatography & Analytical Instruments: As transfer lines, sample probes, and sheath flow tubing in HPLC, GC, and mass spectrometers.
• Precision Fluidics: In inkjet printer heads, precision dosing systems, and laboratory automation.
• Sensor Technology: Sheathing for thermocouples, fiber optics, and pressure sensors.
• Miniature Mechanical Components: Pivot tubes, pneumatic actuators, and bearings in watches, aerospace, and electronics.
• Electronics Cooling: Micro-heat tubes for high-density electronics.