There is provided a semiconductor device including a substrate and a semiconductor film deposited on the substrate, characterized in that the semiconductor film has a laterally grown crystal having an end with a surface projection height smaller than the thickness of the semiconductor film. The device includes a left atrial anchor adapted to be placed in a left atrium of the heart, a right atrial anchor adapted to be placed in a right atrium of the heart, and an elongate member adapted to extend through the passageway and connect the left and right atrial anchors. After forming a dielectric layer in the opening, a storage node is formed as a spacer on the dielectric layer on the inner wall of the opening. The abutments are situated at respective distances from the center of the shaft that increase in the direction of the balance spring from the inside to the outside starting at the point of junction between the balance spring and the collet.