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Mitral Heart Valve with Standard Sewing Ring

Valve Size Catalog Number Tissue Annulus Diameter (mm) Internal Diameter (mm) Sewing Ring Diameter1 (mm) Overall Height (mm) Orifice Height (mm) Internal Orifice Area (cm2)
23 ONXM-233 23 21.4 31 16.1 13.1 3.44
25 ONXM-25 25 23.4 33 17.8 14.2 4.11
27/29 ONXM-27/29 27-29 23.4 34 17.8 14.2 4.11
31/33 ONXM-31/33 31-33 23.4 36 17.8 14.2 4.11


  1. Sewing ring nominal dimensions.
  2. All On-X valve sewing rings are made of polytetrafluoroethylene (PTFE).
  3. Size 23 mitral valves are not available in the United States.

On-X aortic and mitral valves are FDA approved. Not all On-X valve models are available in all markets.
CAUTION: Federal law restricts this device to sale by or on the order of a physician. Refer to the Instructions for Use that accompany each valve for indications, contraindications, warnings, precautions and possible complications.