Accentus presents poster at 1st International PEEK Meeting, Philadelphia, PA, USA

01 May 2013

01/05/2013 - Accentus presented a poster, at The Union League, Philadelphia, PA, USA, on Thursday and Friday, April 25 and 26, 2013.
Imparting osseo-integrating properties to the surface of PEEK implants with hydroxyapatite and titanium plasma spray coating while maintaining the substrate material’s original chemical and physical properties

Accentus Medical has developed lower temperature plasma coatings suitable for non-metallic substrates such as Polyetheretherketone (PEEK) resulting in viable hydroxyapatite and titanium coatings processed at sufficiently low temperatures not to affect the substrate structure and composition.

In the quest to develop the next generation of medical implants designers are increasingly looking towards materials that are a better physiological match to the dynamics of the skeletal system. PEEK has emerged as a material of choice, as its biocompatibility and mechanical properties make it well suited to medical device applications. For example, the modulus of elasticity is a close match to that of bone such that PEEK is able to aid in the development of devices to guard against stress shielding. PEEK is also being chosen by designers for its radiolucent properties.

However, PEEK surfaces are not inherently osseo-integrating, so designers need a viable method for applying coatings to be able to enhance the biocompatibility and durability of PEEK manufactured cementless implants, comparable with coatings on metallic implants today.

Thermal plasma spray coatings of titanium, hydroxyapatite and cobalt chrome have a long clinical history in providing an osteo-conductive surface onto metal implant substrates.

The challenge of using thermal plasma spray coatings on non-metallic substrates such as PEEK, which has a relatively low melt temperature, is apparent in the effect of heat on the material crystallinity. Application of the thermal spray can produce changes in the structure and composition of the PEEK substrate. This is especially evident with the higher process temperatures of the hydroxyapatite coatings. Up to now, designers have been forced to take a judgment on the loss of substrate integrity over the benefit of having a plasma coated surface for osseo-integration.

Accentus Medical has overcome these concerns by developing a modification to their established AcusureŽ range of inert / reducing gas plasma spray coatings for metallic implants. The modified AcusureŽ technology enables the deposition of viable hydroxyapatite and titanium coatings at a low enough temperature to produce a coating that meets essential regulatory requirements and that does not impact on the structure and composition of the PEEK substrate. AcusureŽ treated parts have been evaluated by Invibio, the major PEEK supplier, using their proprietary testing methods for PEEK-OPTIMAŽ. Test results show that coating with AcusureŽ reduced temperature method with titanium, hydroxyapatite or combination of both substances do not adversely affect or degrade the substrate. Furthermore, validation testing indicates coating bond strengths that meet the ASTM tensile strength standards.
Accentus Medical is in the process of updating its AcusureŽ regulatory dossiers, including FDA Master File, to include PEEK-OPTIMAŽ as a validated substrate for coating.

Accentus Medical is looking to build relationships with medical device manufacturers who have PEEK implants or PEEK product development programmes underway.

See the abstract attached as a PDF. Please contact James Armstrong if you would like a copy of the Poster. Click

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