64 results about "Catheter electrode" patented technology

An electrode coupling output system associated with an electrode catheter that provides indication to the physician via the navigation system, concerning the electrical coupling of an electrode, such as an ablative or mapping electrode, with a patient. The indication may be provided by changing the color or other display characteristics of the electrode on the navigation system display or by way of providing a waveform indicating the electrode coupling. In this manner, electrode coupling information is provided to a physician in a manner that minimizes physician distraction.

Methods, systems, and devices for enhancing the efficiency and efficacy of energy delivery and tissue mapping. One system includes a treatment element having a plurality of electrodes and an energy generator that is configured to deliver electric energy pulses to the electrodes in a variety of patterns. For example, electrodes may be arranged in closely spaced pairs. The energy generator may deliver mapping energy to each electrode in each pair individually to map tissue and may deliver ablation energy to the electrodes in each pair together, such that each pair is treated like a single electrode, to deliver ablation energy, such as bipolar ablation energy between adjacent pairs. One system includes at least one concave electrode, the configuration of which concentrates the energy and drives it deeper into the tissue. One system includes neutral electrodes between active electrodes, the energy generator selectively coupling the neutral electrodes to alter the ablation pattern.

An artery, vein, aneurysms vascular malformation or arterial fistula is occluded through endovascular occlusion by the endovascular insertion of a platinum wire and / or tip into the vascular cavity. The vascular cavity is packed with the tip to obstruct blood flow or access of blood in the cavity such that the blood clots in the cavity and an occlusion if formed. The tip may be elongate and flexible so that it packs the cavity by being folded upon itself a multiple number of times, or may pack the cavity by virtue of a filamentary or fuzzy structure of the tip. The tip is then separated from the wire mechanically or by electrolytic separation of the tip from the wire. The wire and the microcatheter are thereafter removed leaving the tip embedded in the thrombus formed within the vascular cavity. Movement of wire in the microcatheter is more easily tracked by providing a radioopaque proximal marker on the microcatheter and a corresponding indicator marker on the wire. Electrothrombosis is facilitate by placing the ground electrode on the distal end of the microcatheter and flowing current between the microcatheter electrode and the tip.REEAXMINATION RESULTS The questions raised in reexamination request 90 / 007,231, filed Oct. 4, 2004 have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e), for ex parte reexaminations, or the reexamination certificate required by 35 U.S.C. 316 as provided in 37 CFR 1.99(e) for inter partes reexaminations.

A system and method for tracking catheter electrode locations with the body of a patient during an MRI scan sequence includes mitigation logic configured to identify one or more impedance measurements that were taken during potentially noise-inducing conditions (i.e., magnet gradients, RF pulses), and were thus subject to corruption by noise. The mitigation logic is configured to replace the potentially corrupt impedance measurements with previously-obtained impedance measurements taken from an immediately preceding acquisition cycle (e.g., from a previous time-slice).

Provided herein are systems and methods for use in identifying location of electrodes of a catheter within a three-dimensional space. The systems and methods initially predict locations of physical electrodes and / or physical magnetic sensors of the catheter in the three-dimensional space. Impedance and / or magnetic responses are predicted for the predicted locations. Actual measurements / responses (e.g., measured responses) are then obtained for the physical electrodes and / or physical sensors. Based on the predicted responses and the measured responses, the systems and methods generate calculated locations of electrodes and / or sensors in the three-dimensional space. The systems and method utilize information from both the predicted responses and the measured responses to produce the calculated locations, which may have an accuracy that is greater than locations produced by either the predicted responses or the measured responses.

A method and system for detecting a virtual electrode (VE) on a coronary sinus (CS) catheter in a fluoroscopic image sequence is disclosed. User inputs indicating locations of CS catheter electrodes and a location of a VE are received. A catheter electrode model and a VE part model is initialized in a first frame of the fluoroscopic image sequence. The VE is tracked by detecting electrode position candidates and catheter body point candidates in the subsequent frames of the fluoroscopic image sequence using respective trained detectors, tracking the catheter electrode model in the subsequent frames based on the detected electrode position candidates, generating VE part hypotheses in the subsequent frames based on detection of the most proximal electrode (MPE) in each subsequent frame, calculating a probability score for each of the VE part hypotheses, and selecting an VE part hypothesis with the highest probability score.