A board is provided that includes a pattern to facilitate attachment of the board to a frame structure. An exemplary IC comprises a plurality of composite circuit elements, a state machine element, and a plurality of communication elements. An expandable container is disposed between the bar and the supporting member in a normally non-expanded state. Upon implantation of the prosthesis, each of the engagement arms is at least partially disposed within a respective one of the semilunar sinuses, such that each of the peak complexes is disposed distal to and in rotational alignment with a respective one of the native commissures, and each of the trough complexes is disposed at least partially within the respective one of the semilunar sinuses.