SS304 Welded Stainless Steel Capillary Medical Tube For IV Injection Needle Tube ISO9626

SS304 Welded Stainless Steel Capillary Medical Tube For IV Injection Needle Tube ISO9626

Medical grade capillary tubes refer to a precision, small-diameter, thin-wall tubular products manufactured from SUS304 (also known as SS304 or UNS S30400) austenitic stainless steel. The tube is produced using a longitudinal welding process and is specifically designed to meet the stringent requirements of ISO 9626:2016. This tube is the raw material for hypodermic needles, cannulas, biopsy probes, and other minimally invasive surgical instruments. The tube starts as a flat stainless steel strip which is roll-formed and seam-welded, as opposed to seamless tube (drawn from a solid billet).

Why SUS304 for Medical Tubes?

It offers excellent formability (allowing for cold drawing to capillary sizes), outstanding corrosion resistance to bodily fluids (including saline and blood), and non-reactive behavior with pharmaceutical compounds. Unlike higher grades (e.g., 316L), SUS304 provides an optimal balance of cost, strength, and workability for non-implantable, short-term contact devices.

Key Features of Medical Grade SUS304 Capillary Tubes:

• Tight Dimensional Tolerances (Per ISO 9626)
• Good Resistant to Corrosion
• High Burst Pressure
• Excellent Flexibility & Kink Resistance
• Non-Toxic & Biocompatible
• Good Cleanliness
• Smooth Surface

Different Applications of SUS304 Medical Grade Capillary Tubes:

• Hypodermic Needles: Standard disposable syringes (gauges 14G to 30G). The weld ensures a continuous lumen without flash.
• Dental Needles: Requires extremely sharp, thin walls (often 30G-33G).
• Biopsy Needles: Core biopsy or fine needle aspiration (FNA) tools where the tube acts as both cutter and sample retrieval conduit.
• Cannulas for Ophthalmic Surgery: Micro-cannulas for retinal surgery (e.g., 27G or 30G flexible cannulas).
• Laparoscopic Instruments: Insufflation needles (Veress needles) and suction/irrigation tubes.
• Medicine Infusion Sets: Subcutaneous or intravenous ports where a fixed stainless steel cannula is preferred over a plastic catheter (e.g., insulin pump infusion sets).
• Guidewire Sheaths & Introducers: Thin-walled tubes that provide a pathway for guidewires.
• Medical Device Components: Precision shafts for surgical staplers, endoscopic graspers, and robotic surgical tools.
• Veterinary Needles: Large gauge (14G-18G) disposable needles for animal use.