title: Failure in placement of trocar-mounted catheters.
abstract: Some commercially available catheters have a trocar with a small knob at the tip. If the catheter is pushed retrograde on the trocar such that the tip lies behind the knob, it may be impossible to advance it again. To avoid this problem, we suggest dilating the track to two French sizes larger than the catheter, using a larger stylet, or using a more rigid catheter.
mesh_terms: D002404:Catheterization / Q000295:instrumentation*; D004322:Drainage / Q000295:instrumentation; D004868:Equipment Failure; D005774:Gastrostomy / Q000295:instrumentation; D006801:Humans; D009403:Nephrostomy, Percutaneous / Q000295:instrumentation