Wholesale Cortex Screws Supplier & Factories

Cortex screws are engineered specifically for dense, lamellar diaphyseal bone. They feature a fine pitch (1.25mm–1.75mm), a larger core-to-outer diameter ratio (typically 0.65 to 0.70), and shallower thread depth, which optimizes purchase in dense cortical walls. In contrast, cancellous bone screws feature an aggressive, coarse pitch (2.0mm–3.5mm) and deep threads with a thin core to pack and compress porous, spongy bone tissue in metaphysical and epiphyseal zones. Cortical screws are also fully threaded along their entire length for plate neutralization, though partially threaded versions are employed when lagging without over-drilling.

Medical Grade 5 Titanium alloy (Ti-6Al-4V ELI per ASTM F136 / ISO 5832-3) possesses a modulus of elasticity (~110 GPa) that is significantly closer to human cortical bone (15–25 GPa) than 316LVM stainless steel (~200 GPa). This modulus parity reduces "stress shielding," a phenomenon where overly stiff implants cause neighboring bone resorption. Furthermore, titanium exhibits superior fatigue resistance, unmatched biocompatibility via its spontaneous titanium oxide passivation layer, and full compatibility with magnetic resonance imaging (MRI) with negligible artifact generation. However, 316LVM remains widely favored for cost-sensitive public healthcare tenders and specific temporary trauma scenarios.

Self-tapping cortex screws feature two or three milled cutting flutes at the tip that evacuate cortical bone chips into the flutes as the screw is driven, creating mating female threads in the pre-drilled pilot hole. This eliminates the necessity of a separate bone tap step, shortening operative times and reducing infection risks. To maintain optimal cutting efficiency and prevent flute clogging, ZATH machines clearance pockets behind each cutting edge, ensuring low insertion torque while maintaining high axial holding power across bicortical bone passages.

Standard catalog cortex screws in sterile packaging generally have an MOQ of 50 to 100 units per length size, while non-sterile bulk configurations for caddy sets can be procured with lower minimums when bundled with matching locking plates or surgical instrument sets. For OEM/ODM custom thread designs, specialized anodization color coding, or branded sterile Tyvek pouches, production setups typically require a minimum run of 500 units per specification. Stock items ship within 4 to 6 business days via DHL/FedEx/UPS/TNT air logistics, while custom manufacturing batches are fulfilled in 4 to 6 weeks.

Yes. A primary differentiator of ZATH is our ability to deliver completely matched clinical systems. We manufacture matching surgical instrument sets for small-fragment (Ø2.7mm/Ø3.5mm) and large-fragment (Ø4.5mm) systems. These sets include quick-coupling screwdrivers with Torx/Hex bits, calibrated depth gauges, double-ended drill guides with hardened drill sleeves, countersinks, bone reduction forceps, and custom anodized aluminum sterilization cases.

All ZATH manufacturing facilities in Beijing are certified under ISO 13485 (Medical Devices Quality Management Systems) and audited regularly. Our implants carry Free Sale Certificates (FSC), UDEM CE compliance documentation, and comprehensive testing documentation verifying compliance with ASTM F543 and ISO 5835. Our regulatory affairs team actively assists qualified international distributors in compiling local dossiers to secure rapid import clearance in European, Latin American, Southeast Asian, and Middle Eastern healthcare markets.