Heart Valve Design & Features

Why Use Another Mechanical Valve When...

On-X Aortic Valve Cutaway Image_cropped

No Other Mechanical Valve Has:

  1. 90° leaflets:1 promotes laminar flow
  2. Pure pyrolytic carbon: reduces thrombogenicity2
  3. Flared inlet: organizes flow; prevents pannus

Leaflet Opening Comparisons

On-X Aortic Heart Valve

90º Opening

On-X Aortic Valves have leaflets that can open 90º to promote better laminar flow.

On-X Aortic Heart Valve Flow

Smoother Surface

On-X Aortic Valves have a smoother surface5 on the entire body and leaflets to reduce thrombogenicity.2

Smoother-Surface-ONX_2

Complete Annulus Support

On-X Aortic Valves have a flared inlet designed to prevent pannus and conceal pledgets.

Complete Annulus Support

All Other Bileaflet Aortic Heart Valves

<90º Opening

All other bileaflet aortic valves have leaflets that can only open 78º to 85º.3,4

All Other Bileaflet Aortic Heart Valves

Rougher Surface

All other bileaflet aortic valves have rougher surfaces5 that are more thrombogenic.2

Rougher Surface_2

Incomplete Annulus Support

All other bileaflet aortic valves have an unprotected inlet design that allows for pannus and exposes pledgets.

Incomplete Annulus Support

References

  1. On-X Prosthetic Heart Valve Instructions for Use.
  2. LaGrange L et al., Compatibility of carbon and blood. Hegyeli RJ, Editor, Proceedings, Artificial Heart Program Conference, Washington, DC, June 9-13, 1969, 47-58.
  3. Medtronic Open Pivot Heart Valve Instructions for Use.
  4. Kandemir O et al., St. Jude Medical and Carbomedics mechanical heart valves in the aortic position comparison of long term results. Tex Heart Inst J. 2006; 33: 154–159.
  5. More R and Haubold A. Surface chemistry and surface roughness of clinical pyrocarbons. Cell Mater. 1996;6: 273-79.

The Basics

Medical Information

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