Abstract:
A probe for cardiac diagnosis and/or treatment carries multiple electrodes (26). The catheter (16) has a multiple layer guide body (24) that carries within a relatively small diameter the many electrical conduction wires (38) typically associated with the multiple electrodes (26). The electrical conduction wires (38) are arranged in two or more discrete, electrically insulated layers overlying the guide body (24).
Abstract:
A steerable first catheter (14) directs the introduction of a guide sheath (16), which can otherwise be free of any onboard steering mechanism. The guide sheath (16), in turn, directs the introduction of an electrode carrying second catheter (18), which can likewise be free of any onboard steering mechanism. Use of a guide sheath positioned by a separate, dedicated steering catheter to guide a separate, dedicated steering electrode carrying catheter results in a significant reduction in the overall size of the system components.
Abstract:
An electrode assembly for use in inter-ventricular cardiac mapping includes one or more elongated splines (76) each of which carries a plurality of spaced apart electrodes (22) thereon. The body of each spline is formed of a plurality of alternating electrically conductive layers (86, 98) and the electrically nonconductive layers (88, 100). A separate electrically conductive pathway (94, 102) is provided to connect each of the electrodes to a different one of the conductive layers. Each of the layers is electrically connected to an electrical signal processing device (92) so that signals provided by each of the electrodes can be processed.
Abstract:
An improved assembly (10) for steering and orienting a functional element (20) at the distal end of a catheter tube (12) holds the functional element (20) with its major axis aligned with the axis of the catheter tube (12) for convenient steering to a tissue site. The mechanism can also pivot the functional element (20) in response to an external force to orient the major axis of the functional element generally parallel to the plane of the tissue site, without bending the catheter tube (12).
Abstract:
An improved assembly (10) for steering and orienting a functional element (20) at the distal end of a catheter tube (30) which holds the functional element (20) with its major axis (24) aligned with the axis of the catheter tube (30) for convenient steering to a tissue site (28). The mechanism can also pivot the functional element (20) in response to an external force to orient the major axis (24) of the functional element (20) generally parallel to the plane of the tissue site (28), without bending the catheter tube (30).
Abstract:
Systems for ablating tissue control radiofrequency power to an ablation electrode (16) by relying upon actual phase sensitive power measurements (72), unaffected by phase shifts between radiofrequency voltage and current. The systems also detect these phase differences (70), if they develop and integrate this factor (30) in making their control decisions.
Abstract:
Electrode assemblies and associated systems employ a nonporous wall (22) having an exterior for contacting tissue. The exterior peripherally surrounds an interior area. The wall is essentially free of electrically conductive material. The wall is adapted to assume an expanded geometry having a first maximum diameter and a collapsed geometry having a second maximum diameter less than the first maximum diameter. The assemblies and systems include a lumen (34) that conveys a medium containing ions into the interior area. An element free of physical contact with the wall couples the medium within the interior area to a source of electrical energy to enable ionic transport of electrical energy from the source through the medium to the wall for capacitive coupling to tissue contacting the exterior of the wall.
Abstract:
Systems and methods for heating or ablating tissue use a multifunctional electrode assembly (20). The electrode assembly includes a wall (22) comprising an electrically conductive material peripherally surrounding an interior area. The wall has an interior surface facing the interior area and an oppositely facing exterior surface. A first element operatively associated with the exterior surface of the wall is adapted to carry out a first predetermined electrical transmitting or sensing function affecting body tissue. A second element operatively associated with the interior surface of the wall is adapted to carry out, independent of the first element, a second predetermined electrical transmitting or sensing function affecting body tissue different than the first predetermined electrical function.
Abstract:
Systems for ablating body tissue comprise a family of electrode assemblies. Each electrode assembly (22) includes an extruded wall carrying an amount of electrically conductive material co-extruded within it. The extruded walls possess different electrical resistivity values by virtue of different amounts of electrically conductive material co-extruded within the walls. The systems also include means for specifying, among the family, use of the electrode assemblies according to a function that correlates desired tissue ablation effects with electrical resistivity values of the walls.