A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
A61M25/00—Catheters; Hollow probes
A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
A61M25/0122—Steering means as part of the catheter or advancing means; Markers for positioning with fluid drive by external fluid in an open fluid circuit