Apparatus and method for monitoring capacitive elements of an implantable medical device system for device failure and responding thereto. Magnetic, piezoelectric or other mechanisms are used to vibrate the end of the fiber and thus create a scanning effect which extends the field of view. The vehicle may also include a second brake input mechanism capable of varying the ratio of the second braking force to the first braking force. By varying the frequency of the two source light waves, the intensity of the combined Raman-scattered light can be modulated to achieve finer resolution. Optionally, permanent sterilization is effected by passing a current through the resilient structure to the tubal walls. The sizes of a major proportion of the zones of resorbable material are from 10 to 500 microns.