Abstract:
Systems (10) for examining heart tissue morphology deploy one or more electrodes (38) into the heart in contact with endocardial tissue. The systems transmit electrical current from the electrodes (38) in paths through the contacted endocardial tissue. Based upon these current transmissions, the systems derive the electrical characteristics of tissue lying in the path. This electrical characteristc can be directly correlated to tissue morphology. The systems maximize surface contact with endocardial tissue, while minimizing contact with the surrounding blood pool, to obtain accurate tissue electrical characteristic measurements.
Abstract:
This invention is a multiple electrode array for ablating tissue that carries at least two electrode segments (26, 27, 28, 29) that are circumferentially spaced form each other. Insulation (30) electrically isolates the separated electrode segments from each other. Signal wires (19) attached to the separated electrode segments convey ablating energy independently to the separated electrode segments. Because of its segmented structure, the array can place only one of the electrode segments in contact with tissue at one time. Because each segment is electrically isolated, and because each segment is independently served by its own signal wire, a physician can operate an ablation energy generator to selectively channel the ablation energy only to the segment actually contacting the tissue.
Abstract:
A device for creating the lesions in body tissue includes a support element having an electromagnetic energy emitting region. When caused to emit electromagnetic energy, the region creates a single continuous lesion that is long and thin, having a lengththat is substantially greater than its width.
Abstract:
An electrode circuit (34) has a distal region (32) for carrying at least one electrode, a proximal region (30) for connection to an external apparatus, and an intermediate region electrically coupling the distal region with the proximal region. At least one, and preferably all, of the regions comprises a flexible ribbon cable having two or more adjacent tracks (T1-T6) of electrical conduction material and adjoining electrical insulating material. Use of ribbon cable makes possible reliable connections without the need for complicated multiplexing schemes at the distal region.
Abstract:
A probe (18) or cardiac diagnosis and/or treatment has a catheter tube (16). The distal end of the catheter tube carries first and second electrode elements (26, 88). The probe includes a mechanism (92) for steering the first electrode element relative to the second electrode element in multiple directions.
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.
Abstract:
Systems and methods analyze bio-potential morphologies in body tissue. The systems and methods use a template of a bio-potential event of known cause in body tissue. The systems and methods compare this template to a sample of a bio-potential event externally triggered in body tissue. The systems and methods generate an output based upon this comparison. The systems and methods can be used to compare an event specific to the template of a cardiac event (T(i)) of known diagnosis to a sample of a placed cardiac event (P(i)). The comparison yields a matching coefficient (MCOEFF(i)) indicating how alike the input sample is to the input template. The matching coefficient can be used by the physician, for example, to aid in the location of sites that are potentially appropriate for ablation.