Abstract: An adjustable ventricular catheter is disclosed. This invention has a proximal catheter in which a distal catheter telescopically slides. The distal catheter is prevented from separating from the proximal catheter in the maximum extended position by locking means. The distal catheter may be further extended, forshortened, or removed by means of a stylet inserted into the hollow of the proximal and distal catheters with flexible projections on the end of the stylet capturing drain holes on the closed end of the distal catheter such that sliding of the stylet moves the distal catheter in a telescoping relationship within the proximal catheter.