Abstract: Catheters incorporating an electromagnetic field detection device for use in conjunction with a catheter locating apparatus to determine the position of a catheter without the use of X-rays is disclosed. The electromagnetic field detection device includes a pair of leads incorporated into the wall of the catheter and a coil of fine wire located at the distal end of the catheter. In a closed end catheter embodiment, a core of magnetically permeable material is located inside the coil. In an open ended catheter embodiment the core is either omitted or a hollow core is used. In a Venous catheter embodiment, one way valves are located in the sidewall of the catheter near the catheter's distal end. The one way valves permit the injection of fluid into tissue through the catheter while preventing blood from flowing into the catheter.

Abstract: Methods and apparatus for providing suction and/or irrigation in rigid endoscopes used for, e.g., bronchoscopy, esphagoscopy, and sigmoidoscopy are described. The described methods and apparatus permit a user of the endoscope to maintain visual contact with a target area being viewed though the endoscope during suction/irrigation procedures. In accordance with the present invention, the antifog port of a known rigid endoscope assembly is coupled to a suction/irrigation apparatus as opposed to being plugged or coupled to an antifog fluid source. The antifog port is thereby converted into a suction/irrigation port. By providing suction/irrigation via the antifog port, the need to remove the telescope to perform suction and/or the need to use an instrument incorporating a suction channel is eliminated. The suction/irrigation apparatus of the present invention includes an extension tube, a syringe, a valve, e.g., a two way stop cock, and a connecting tube.