Table 5 On-X versus SJM design comparison
Feature | On-X Valve (On-X Fig. 1) | SJM Valve (SJM Fig. 2) |
|---|---|---|
Material | Pure pyrolytic carbon | Silicon-alloyed pyrolytic carbon |
Sewing ring position | Supra-annular | Supra-annular |
Valve position | Intra-supra-annular | Supra-annular |
Pannus overgrowth protection | Yes | No |
Orifice length | Longer natural length-to-diameter ratio | Shorter less than natural length-to-diameter ratio |
Pivot design | Actuated by remote center of rotation | Fixed rotation point |
Leakage path | Smooth through contoured pivot with set gap tolerances | Jet through angular pivot |
Closing geometry | Two points at 45° from leaflet tip reducing closing velocity | Single point at tip of leaflet |