INSTRUMENT OF PATTERNING CUSP FOR CARDIAC VALVE RECONSTRUCTION AND COMPONENT THEREOF

摘要

In a case of repairing an aortic valve by forming a valve cusp with a biomembrane, the shape and the size of a valve cusp can be determined easily. An instrument including a valve cusp sizer for measuring the size of the valve cusp and a template for scribing lines for the shape of a valve cusp conforming to the measured size of the valve cusp, in which the valve cusp sizer has a plurality of differently-sized sizer blocks attached to each of the top ends of grip members respectively and each sizer block has an arcuate surface formed by cutting each of differently-sized circular cylinders at an angle conforming to the central angle for the commissure portions and, the template is formed with a scribing portion including a substantially semi-circular valve cusp base forming portion.

主权项

1. A method of treatment of abnormal valve cusp syndrome, the method comprising:
excising a plurality of abnormal valve cusps selected from the group of left coronary cusp, right coronary cusp and noncoronary cusp; inserting a cusp sizer at a portion where the plurality of abnormal valve cusps are excised, wherein the cusp sizer comprises a sizer block with an arcuate surface with an angle conforming to the central angle for commissure portions of an aortic valve, the arcuate surface comprising two probe portions disposed on both ends thereof; an upper surface of the sizer block being curved in a concave shape and comprising an index which is a center marker for defining a central point from which stitching is started; measuring the size of the excised valve cusps by: making the sizer block abut the valve annulus of an aorta from which the valve cusps are excised, the central point for the base of each valve cusp between the commissure portions being visible; confirming the two probe portions of the sizer block fit to both of the commissure portions of one of the excised abnormal valve cusps, thereby reading nominal diameter of the cusp sizer; obtaining a new valve cusp formed of a pericardium by: scribing lines for a cusp shape by drawing along an inner peripheral surface of a scribing portion of a template which relates to the nominal diameter to the pericardium; and cutting the pericardium in accordance with the lined cusp shape; dipping the new valve cusp formed of a pericardium in saline; abutting the cusp sizer having the nominal diameter in a manner that the two commissure portions of the excised valve cusp conforms to the two probe portions of the sizer block; putting a thread to a valve annulus at a position indicated by the index; stitching the central point of the base of the valve cusp; and stitching toward the commissure points from the central point, thereby reconstructing the aortic valve.