SUS304 Stainless Steel Back Cut Indwelling Needle Tube For Intravenous Infusion Therapy
SUS304 Stainless Steel Back Cut Indwelling Needle Tube For Intravenous Infusion Therapy
The Medical Stainless Steel Back Cut Indwelling Needle Tube is a high-precision, hollow, thin-walled tubular structure made from SUS304 Medical Grade Austenitic Stainless Steel, manufactured in compliance with the ISO 9626: 2016 international standard. It forms the core metallic needle of an Indwelling Venous Catheter (commonly called an IV cannula). The "back cut" (or "double grind" / "lancet point") refers to a specific grinding technique that creates an ultra-sharp, tri-beveled point with a secondary grind on the underside, significantly reducing penetration force and improving "first-stick" success rates. This indwelling needle tube acts as the initial introducer, puncturing the vein and allowing the over-the-needle flexible catheter to be advanced; the needle is then withdrawn and discarded.
Regular Sizes:
Common sizes for peripheral IV therapy:
| Gauge (G) | Typical Outer Diameter (OD) | Standard Length | Primary Use |
| 14G | 2.10 mm | 45 - 50 mm | Major trauma, rapid high-volume infusion. |
| 16G | 1.60 mm | 45 - 50 mm | Surgery, major bleeding, fast transfusion. |
| 18G | 1.20 mm | 42 - 45 mm | Routine blood transfusion, general fluids. |
| 20G | 0.90 mm | 32 - 38 mm | Most common adult peripheral IV, routine fluids, IV medications. |
| 22G | 0.70 mm | 25 - 32 mm | Pediatrics, elderly, fragile veins, prolonged infusions. |
| 24G | 0.55 mm | 19 - 25 mm | Neonates, pediatric, very small / fragile veins. |
| 26G | 0.45 mm | 19 - 25 mm | Extreme pediatrics / neonatology, superficial micro-veins. |
Key Advantages & Characteristics:
1. SUS304 Stainless Steel Material:
- Excellent Corrosion Resistance: Highly resistant to bodily fluids, saline, and many medications.
- High Strength & Rigidity: Provides necessary column strength for clean puncture without buckling.
- Biocompatibility: Non-toxic, non-reactive, suitable for transient tissue contact.
2. Back-Cut (Tri-Bevel) Point:
- Ultra-Sharpness: Reduces penetration force, minimizing patient tissue damage.
- Clean Entry: Creates a precise slit in the vein wall, aiding catheter advancement and reducing post-removal bleeding.
- Superior Finish: Polished surface minimizes friction ("drag") during insertion and withdrawal.
- Consistency & Reliability: Precision manufacturing ensures every needle performs identically.
Main Injection/Insertion Areas:
1. Peripheral Veins of the Upper Extremities:
- Dorsal metacarpal veins.
- Cephalic vein.
- Basilic vein.
- Median antebrachial vein.
2. Peripheral Veins of the Lower Extremities (less common in adults, used more in infants):
- Dorsal pedal veins.
- Saphenous vein.
- Scalp Veins: Primarily in neonates and infants.
Different Applications:
- Peripheral Intravenous (IV) Therapy
- Standard Peripheral IV Catheters: Most common use.
- Safety IV Catheters: Integrated with needle retraction or shielding mechanisms to prevent needlestick injuries.
- Midline Catheters: Used as the introducer for longer catheters placed in deeper arm veins.
- Winged Infusion Sets ("Butterfly"): Often utilize a 25G or 27G stainless steel needle for short-term or pediatric access.
- Specialized Administration Sets: For specific drugs or therapies requiring reliable venous access.
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