316L Stainless Steel Medical Capillary Tube Grinding Edge Marking Sandblasting

Product Description

316L Stainless Steel Medical Capillary Tube with Ground Bevel, Marking, Sandblasting, End Capping, and Diameter Reduction is a highly processed, multi-functional precision component designed for advanced medical and laboratory fluidic systems. It starts as a high-purity 316L stainless steel capillary tube and undergoes a series of value-added operations: a precision-ground bevel at the tip for sharp penetration or specific fluid egress, permanent laser marking for identification, uniform sandblasting for a cleanable matte finish and enhanced grip, hermetic end capping (sealing) at one terminus, and controlled diameter reduction (necking) along its length for fitting integration or flow control. This integrated processing creates a robust, traceable, and performance-optimized component ready for critical applications.

Product Processing

1. Material Verification & Cutting: Medical-grade 316L stainless steel capillary tubing (ASTM A269) is verified and cut to specified pre-form length.

2. Diameter Reduction (Necking): Using precision rotary swaging or micro-forming, specific sections of the tube are radially compressed to create a reduced outer diameter, often to form a step for an O-ring or to fit into a smaller port.

3. End Capping/Sealing: One end of the tube is hermetically sealed. This is achieved via cold-forming (forging the end into a solid dome) or orbital micro-welding (for the highest integrity seal, especially for pressurized applications).

4. Stress Relief Annealing: After cold working (necking, swaging), the part undergoes a controlled vacuum or inert atmosphere annealing cycle to relieve internal stresses, which is critical for 316L to prevent sensitization and restore corrosion resistance.

5. Bevel Grinding: The open distal end is precision-ground on a CNC micro-grinder to create a sharp, consistent bevel edge. The bevel angle (e.g., 20°, 30°) is tightly controlled for its intended function (piercing, dispensing).

6. Sandblasting (Bead Blasting): The entire external surface is uniformly sandblasted using high-purity, non-contaminating media (e.g., glass beads). This creates a consistent matte finish, removes any scale, and provides an optimal surface for subsequent marking.

7. Passivation: Following sandblasting, the component is chemically passivated per ASTM A967 (Method for 316L) to remove any embedded iron particles and restore the maximum corrosion-resistant passive oxide layer.

8. Laser Marking: A fiber laser system applies permanent, high-contrast markings onto the sandblasted surface. Markings can include part numbers, lot codes, size specifications, or flow direction arrows.

9. Final Cleaning & Inspection: A final precision cleaning (e.g., ultrasonic) removes all processing residues. Each part undergoes 100% dimensional inspection and visual examination. Sealed ends are 100% tested via helium leak detection or pressure decay testing.

Product Applications

• Implantable Drug Delivery Systems: As a fluid conduit or port needle for insulin pumps, intrathecal drug delivery systems, or other implantable devices, where a sealed end, a specific bevel for membrane penetration, and permanent identification are required.

• High-Pressure Chromatography (HPLC/UHPLC): As a custom needle or transfer line with a sealed end for pressure integrity, a reduced diameter for fitting into narrow ports, a beveled tip for septum piercing, and marked for traceability.

• Analytical & Diagnostic Sensor Probes: Sheaths for in-vivo or in-line sensors (e.g., blood gas, glucose) where a sealed tip protects the sensor, a necked section allows for mounting, and a matte finish reduces light reflection.

• Micro-Surgical & Biopsy Tools: Components for specialized handpieces where the capillary acts as a guide or channel, featuring a sharp bevel for entry, a sealed proximal end, and marked for size identification.

• Laboratory Fluidic Manifolds: Custom connectors or injection ports within complex micro-fluidic setups.

Product Technical Parameters (Detailed Table)