Production Process & Quality Control Of PTC Needles

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Despite its apparent simplicity, Chiba needle manufacturing integrates precision tube processing, micro-grinding, surface treatment, and stringent sterile medical device QC.

① Raw Material Selection

Shaft:​ Seamless capillary tube per ASTM F138/F139 (316L or 304 low-carbon stainless); inner surface often electropolished in raw stock

MRI-compatible versions:​ Nitinol (NiTi) or Titanium tube; Ni ion release must comply with ISO 10993-1

Hub:​ Medical-grade polycarbonate (PC) or ABS - transparent, EO/gamma tolerant, DEHP-free

② Tube Cutting & Straightening

High-precision feed cutter → length with processing allowance; cut face perpendicularity error <0.05 mm

Three-roll straightening → full-length deviation ≤0.3 mm to prevent intra-procedural deflection

③ Lumen Conditioning & Deburring

Inner diameter finalized by plug-drawing / burnishing

Both ends chamfered to remove burrs → prevents stylet jamming & tissue tearing

④ Needle Tip Grinding (Critical Process)

External grind to classic 25° bevel​ (or per spec); secondary relief grind (back-cut) optional to reduce insertion force

Fine diamond abrasive / paste polish → microscope-inspected for symmetric bevel, no rolled edge, no micro-chipping

100% tip visual inspection or AOI sampling per SPC

⑤ Shaft Marking & Surface Treatment

Laser-etched centimeter graduations from tip; ink or laser color fill for readability

Optional: passivation (stainless) or dull-coat (Teflon® thin film) to reduce drag

Echo marker: micro-indentation or localized laser texture near tip; platinum/titanium ring on premium lines

Nitinol shafts: electropolish + acid passivation to remove surface-activated nickel layer

⑥ Hub Assembly & Bonding

Needle tube crimped/adhered into Luer-Lock or Luer-Slip hub with medical epoxy or UV adhesive; torque-tested (typically ≥0.5 N·m non-loosening)

Stylet (if included) assembled - stylet tip protrudes 0.5–1 mm beyond cannula tip to aid tissue penetration & prevent lumen clogging

Leak test: air pressure applied → submerged → no bubble emission

⑦ Cleaning & Particulate Control

Multi-stage purified water rinse, ultrasonic cleaning to remove grinding compounds & metal fines

Final rinse tested per USP <788>​ particulate matter limit → mitigates micro-embolism risk

⑧ Sterilization & Packaging

Typically Ethylene Oxide (EO)​ sterilization; validate dose, aeration cycle, EO/ECH residuals (EO ≤ 4 µg/device, ECH ≤ 9 µg/device per ISO 10993-7)

Sterility Assurance Level (SAL) = 10⁻⁶

Tyvek® lid/blister or peel-pouch pack; outer carton with LOT, expiry, Gauge×Length, registration No.

⑨ Quality Management & Release Tests

Full ISO 13485​ QMS; special processes (grinding, assembly, sterilization) validated via IQ/OQ/PQ

Finished product sampling:

Dimensional (OD/ID/bevel angle/length - vision metrology)

Tip morphology (microscopy)

Hub pull-off strength

Lumen patency / flow

Sterility, pyrogen (LAL or rabbit)

Biocompatibility (ISO 10993 cytotoxicity/sensitization/hemolysis - lot sample)

For export: FDA 21 CFR 820 (US) / EU MDR (CE) as applicable

OEM/ODM customization (2D/3D drawing or sample) typically includes Gauge, length, bevel angle, hub color code, echo tip presence, and inclusion of micro-guidewire set. Sampling 4–8 weeks; production lead time varies with volume. Key supplier audit points: valid ISO 13485, NMPA (or equivalent) registration covering intended use, batch traceability, and adverse event history.