Abstract: A catheter includes a steering mechanism for manipulating the distal end of the catheter to obtain a plurality of deflection profiles, a torque transfer system to enhance torque transfer from the handle to the distal tip, and a support system to reduce undesirable deformation of the distal-end region during steering. The torque transfer system includes a flat ribbon within the relatively flexible distal-end region to enhance torque transfer through the distal-end region of the catheter. The support system includes a compression cage and longitudinal struts that are located within the distal-end region of the catheter. The support system can support axial loads and deflect laterally in the direction of the steering, thereby reducing the amount of stretching and compression of the catheter sheath within the deflecting region.

Abstract: A small, portable infusion device for ambulatory use by a patient includes an audible enunciator integrated circuit chip. This chip is controlled by a microprocessor to provide output data to an operator, and to work in place of, or in association with a visual output display, such as an LCD screen. The audible data output permits a remote clinician to monitor operation of the pump, and diagnose and correct problems with the pump's operation.