Medical-Grade Nitinol Wire: Surface Finish Types and Applications

Nitinol wire, renowned for its superelasticity, shape memory effect, and excellent biocompatibility, is essential in the manufacturing of advanced medical devices. One of the key factors impacting the performance and safety of medical instruments is the surface finish of nitinol wire. Different surface conditions cater to various medical applications, influencing corrosion resistance, flexibility, weldability, and biocompatibility.

At Bokang Titanium, we offer a comprehensive range of nitinol wire surface finishes designed to meet diverse clinical and industrial requirements.

Six Common Types of Nitinol Wire Surface Finishes and Their Applications

1. Black Oxide Surface

• Features: Includes regular black and clean black finishes with an oxide layer.

• Applications: Ideal for preliminary processing of medical instruments and industrial parts.

• Typical Uses: Elastic components, basic medical devices, industrial machinery.

2. Light Oxide Surface

• Features: Gold to brown coloration with a thinner oxide film.

• Applications: Suitable for moderate processing requirements on medical accessories and structural components.

• Typical Uses: Medical fittings, device components.

3. Bright Surface

• Features: Smooth and shiny finish.

• Applications: Preferred for guidewires and retrieval tools used in interventional medicine.

• Typical Uses: Guidewires, interventional devices.

4. Ultra Bright Surface

• Features: Highly polished, mirror-like finish for precision instruments.

• Applications: Used in high-precision interventional devices requiring superior surface quality.

• Typical Uses: Endodontic files, stone retrieval baskets, cardiovascular devices.

5. Polished Surface

• Features: Precision ground for exact dimensional accuracy and smooth texture.

• Applications: Manufacturing of high-precision medical components.

• Typical Uses: Endodontic instruments, precision medical parts.

6. Clean Surface

• Features: Extremely clean, nearly oxide-free surface offering optimal biocompatibility.

• Applications: Specifically for implantable medical devices demanding the highest safety standards.

• Typical Uses: Stents, occluders, implantable tools.

Why Surface Finish Matters

The surface finish of nitinol wire directly affects device performance, biocompatibility, and manufacturing efficiency. Choosing the right finish balances corrosion resistance, flexibility, laser weldability, and cost-effectiveness, ensuring reliability in critical medical applications.

Customization and Quality Assurance

At Bokang Titanium, we provide custom nitinol wire in various diameters, tempers, and surface finishes tailored to your project specifications. All production follows ISO 13485 and ISO 9001 certified processes, guaranteeing consistent quality and regulatory compliance.

Contact Us

Looking for high-quality medical-grade nitinol wire with precise surface finishes?
Contact Bokang Titanium today for samples, custom solutions, and expert technical support tailored to your medical device needs.