In one embodiment, a method of fabrication an implantable lead for providing electrical pulses to tissue of a patient, the method comprises: (i) providing a sheath of transparent insulative material, wherein the sheath comprises a plurality of lumens； (ii) scanning across the sheath with a confocal displacement meter to generate displacement data； (iii) processing the displacement data, in software executed on a computer system, to generate a representation of an exterior surface and lumens of the sheath； (iv) automatically selecting locations, in software executed on a computer system, on the exterior surface of application of laser pulses to create apertures in the sheath that provide access to respective lumens of the sheath； and (v) applying laser pulses according to the sheath to create the apertures.
