One or more embodiments are directed to optical module assemblies, such as a camera module assembly, and methods of forming same. These multiphasic stimulation pulse waveforms are configured such that they can be substantially rejected within the intracardiac signal sensing circuitry. A left and a right ends of teeth back face end portions of the insulating wire groove seats form two sideward-standing face portions, which correspond to and join each other to form an annularly closed stable joint.