Effect of Leaflet Pattering on Mechanical Valve Hydrodynamic Properties / 医学研究杂志

ABSTRACT

Objective To investigate the effects patterned structure located on the surface of mechanical valve leaflet exerted on the hydrodynamic properties of valve prostheses.Methods Bileaflet aortic mechanical valves of GKS 21A and 23 A were randomly selected as the control group,hydrodynamic performance of each valve were assessed,as per ISO5840 by calculating mean transvalvular pressure(MTP),regurgitation fraction(REG),effective orifice area(EOA)and effective orifice area(eLoss).Then,laser etching was applied to construct a parallel-groove array pattern on leaflet surface perpendicular to the direction of the blood flow.The valve was subjected a-gain to the same test,and the data obtained were recorded and analyzed.Results In the pulsating flow test,the MTP of the experimental group was smaller than that of the control group at the same flow rate and size.The RE in GKS 21A experimental group was smaller than that in control group,and the RE in GKS 23A experimental group was larger than that in control group.The EOA in the experimental group was larger than that in the control group at the same flow rate and size.The eLoss in the GKS 21A experimental group was smaller than that in the control group,and the eLoss in the GKS 23A experimental group was larger than that in the control group.Conclusion The parallel-groove array pattern on the surface of the leaflet affected the hemodynamic performance of the valve prostheses.