Vascular Guidewires

PTFE Coated Guidewire Application's

Vascular Guidewire Coating's

Miller-Stephenson’s renowned PTFE coatings are designed to withstand narrow atherosclerotic vessels within the vasculature while maintaining the reliability, flexibility and durability that is needed for endovascular surgery.  Stainless steel and nitinol are the typical alloys of choice when developing a vascular wire and therefore utilizing our 850G-1025 can offer exceptional application results. Wires come in several different geometries, lengths, diameters, alloy substrates and coating thicknesses to accommodate tortuous vascular anatomy. Our coatings are designed to fortify and encapsulate a vascular wire and provide stability, trackability, reliability and great adhesion to substrate materials.

Nitinol Wire Coating

Nitinol wires are common alloys that are regularly utilized in the medical industry for medical components. These alloys are temperature sensitive and cannot withstand the same intense heat of many current PTFE coatings on the market. This is where Miller-Stephenson offers our 850G-1000 coating that is ideal for low temperature alloys, while still maintaining the strength and durability of the substrate and coating. Our thin film 5-10 micron applications offer the customer the most robust and durable coating without interfering with specialty engineered wire features, like radioopaque marker bands. Our coatings are notoriously known to grip, adhere and conform to unusual geometrical alloy patterns, while still maintaining the radioopacity for intraoperative fluoroscopy.

Nitinol #1Guidewires, Core wires, stents, mandrels, forming mandrels, stone retrieval baskets, Orthodontic wires
Nitinol #2Ideal for applications that require a high loading and unloading plateau stresses at room temperature.
Nitinol #3Applications that require increased alloy stiffness.
Nitinol #4Best cycling performances at body temperature (37°C), for example in orthodontic arch wires.
Nitinol #5 & 6A common application for this alloy is high temperature actuators.
Nitinol #8Ideal for applications that require a phase transformation at body temperature (37°C) 98.6°F
Nitinol #9Used in extremely cold temperature environment applications.

Stainless Steel Wire Coating

All of Miller-Stephenson’s medical PTFE coatings are optimized and designed to bond and encapsulate over stainless steel wire, reducing the coefficient of friction while maintaining a durable robust coating layer. Stainless Steel is the most common alloy substrate material in the medical industry and is provided in various grades, all of which can be coated with our PTFE coatings.

302 Stainless SteelCommonly used for medical stylets, needles, springs, Guidewires..etc
304 Stainless SteelCommonly used to manufacture surgical instruments and specialty surgical supplies
316 Stainless SteelCommonly used for Bone Pins, Skin Closure Staples, Othopaedic cables and suture wire.

Coating Equipment & Application Recommendations

All of our PTFE coatings can be applied via spray, dip or spool-to-spool methods. Proper pre-coating wire cleaning treatment and post-application curing equipment is critical to guarantee performance and durability. Acceptable curing equipment includes high-temperature ovens which can safely maintain temperatures of 246 °C  (475 °F) or utilize IR ovens. This will ensure proper sintering of the coatings onto the wire and promote the best surface characteristics that can be achieved.

ASTM & ISO Standards Met


  • ASTM 1894 Coefficient of Friction
  • ASTM D3359 Adhesion Test
  • ISO 7802 Wire Wrap Test
  • ISO 11070 Corrosion Resistance Test
  • Coated smooth stainless steel panels passed Adhesion test, ASTM-3359
  • Coated stainless steel catheter guidewires passed flexibility/adhesion tests, ISO 7802 Annex F wrapping test
  • Coated stainless steel catheter guidewires passed corrosion resistance, ISO11070 Annex B, saline soak test

All Miller-Stephenson’s formulations generate very uniform thin films which exceed all ISO and ASTM requirements.

Do you currently work with a PTFE coating that isnt meeting your requirements?

Looking to qualify or replace an existing PTFE coating?

With a wide array of coatings, you can qualify a new PTFE coating here. 

Don't have the coating equipment or experience?

This exceptional coating service is offered to any customer or OEM that does not have the ability to coat in-house or is looking to have a complete pre-coated turn-key solution product made and delivered. We offer customers the ability to utilize the coating services of the most highly regarded medical coaters in the United States. They provide strictly medical coating operations on some of the world’s most difficult geometrical device designs.

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