Patent ID: 8788043

Claim:
A method of delivering a medical device within a brain of a patient, said method comprising: inserting a distal portion of a main cannula into said brain, said main cannula having a longitudinal axis and a lumen; positioning a guiding cannula in said lumen of said main cannula, said guiding cannula comprising a lumen and a distal end portion; adjusting an insertion depth of said guiding cannula, wherein said distal end portion of said guiding cannula is bent as it is advanced from said main cannula, such that a longitudinal angle is formed between a line perpendicular to, and extending through, said longitudinal axis, and said bent distal end portion of said guiding cannula when projected within a plane that includes said line; setting said longitudinal angle by rotating said distal end portion within and relative to said main cannula prior to advancing said distal end portion from said main cannula; and passing a medical device through said lumen of said guiding cannula into said brain.