an apparatus and method for securing medical devices such as intracerebroventricular and parenchymal catheters and electrical stimulation leads within a cranial burr hole comprising a snap ring assembly selectively secured at the burr hole so that an extension of the assembly , having one or more points of fixation for a catheter or lead , secures a catheter or lead extending through the burr hole at a desired point , thereby minimizing undesirable movement of the positioned medical device . the catheter or lead is secured by opposed edges of bar extensions that are placed about the lead or catheter when the snap ring assembly is squeezed and a space between the edges is opened , but that close upon and hold the catheter or lead when the snap ring is released ; by a scissors - like jaws mechanism operatively coupled to the snap ring assembly which clamps and holds the positioned device ; or by a rigid extension having at least one fixation point through which the catheter or lead passes and at which the catheter or lead is secured .