A cannula assembly having a plurality of outwardly-biased flexible fins capable of inward movement such that the fins converge upon insertion of a trocar device. For example, asynchrony may be measured between the left and right ventricles and within the left ventricle. The internal shutter at the second position is movable to the third position while closing the outlet. An increase in a gain factor of the electrode area is thus dependent upon an associated spacer height and particular number of islands or vias. The mechanism is compact in structure and convenient in operation. The invention further relates to hybrid soybean seeds, plants, and plant parts produced by crossing cultivar S110142 with another soybean cultivar.