A medical apparatus and method suitable for remodeling a mitral valve annulus adjacent to the coronary sinus. The keypad module includes a keypad module housing and a keypad mounted on the keypad module housing. The invention also includes a method of preventing a Schwann cell from forming a tumor by contacting the cell with an amount of tyrphostin AG825 sufficient to inhibit a receptor selected from ErB2, ErB3, \u03b21 integrins and combinations thereof, so as to prevent phosphorylation of Schwannomin-S815 by one or more endogenous kinases. The structures have horizontal members including apertures that interface with the guiding structures as the horizontal members are lowered into place.