Abstract: An apparatus for injecting a fluid into the heart and making temperature measurements within the pulmonary artery comprising an elongated flexible tube having a distal end portion, a temperature sensor mounted on the distal end portion, a peripheral wall, at least one lumen extending longitudinally within the tube and an injectate port opening in the peripheral wall proximally of the temperature sensor. The tube can be advanced through a vein, the right atrium and the right ventricle to place the distal end portion in the pulmonary artery and the injectate port in the right atrium facing generally toward the inferior vena cava. The temperature sensor is oriented on the distal end portion so as to materially reduce the likelihood that it will contact the wall of the pulmonary artery during use.

Abstract: An apparatus for injecting a fluid into the heart and making temperature measurements within the pulmonary artery comprising an elongated flexible tube having a distal end portion, a temperature sensor mounted on the distal end portion, a peripheral wall, at lest one lumen extending longitudinally within the tube and an injectate port opening in the peripheral wall proximally of the temperature sensor. The tube can be advanced through a vein, the right atrium and the right ventricle to place the distal end portion in the pulmonary artery and the injectate port in the right atrium facing generally toward the inferior vena cave. The temperature sensor is oriented on the distal end portion so as to materially reduce the likelihood that it will contact the wall of the pulmonary artery during use.

Abstract: An apparatus for making electrical contact within the heart of a patient for pacing the heart and ECG sensing comprising an elongated tube sized to be received through a vein or artery into the heart and having a peripheral wall, at least one lumen and an opening in the peripheral wall which extends from the lumen to the exterior of the tube. An electrode is mounted in the lumen with the electrode being exposed at the opening. At least one conductive lead is coupled to the electrode and extends proximally within the tube. The tube has a body line, and the electrode extends radially outwardly no farther than the body line.