An apparatus includes a catheter, a sensor, a first pair of wire segments, an artifact reduction feature, and a correction module. The sensor is positioned at a distal end of the catheter and is configured to generate a sensor signal. The first pair of wire segments is coupled with the sensor and extends along the length of the catheter. The artifact reduction feature is positioned proximate to the sensor and includes a second pair of wire segments. The correction module is configured to subtract motion-induced artifacts from signals received from the first pair of wire segments, based on motion-induced artifacts from signals received from the second pair of wire segments, to thereby provide a corrected sensor signal.

A method is provided. The method includes pacing, by electrodes of a catheter, a heart tissue with pulses. The method includes observing, by the electrodes, a period of electrophysiological repolarization for the heart tissue. The period of electrophysiological repolarization is caused by the pacing. The method also includes measuring, by the electrodes, an electrical signal within the heart tissue after the period of electrophysiological repolarization.

A catheter comprising an elongated catheter body, an electrode array distal of the catheter body, the array having a mounting member and at least first and second spine supports. Each spine support includes a base having a planar configuration, and a plurality of spines extending from the base, wherein the first base extends in a first plane and the second base extends in a second plane different from the first plane in the mounting member.

In one exemplary mode, a medical system includes a catheter configured to be inserted into a body part of a living subject, and comprising multiple electrodes configured to contact tissue of the body part, a display, and processing circuitry configured to receive a signal from one of the electrodes, find a noise measurement of the signal, and render to the display a dynamic indication of the noise measurement.

Improved mapping and ablation procedures and corresponding devices are provided. A variety of methods and apparatuses can be used for the treatment of cardiac arrhythmias by identifying the location of an arrhythmia source and ablating that source. The methods and apparatuses can provide an improved means of electrical mapping of the heart to identify the location of the arrhythmia source and advancing an ablation electrode to that location so that it may be ablated.

An apparatus includes a shaft, configured for insertion into a body of a subject, and an expandable element coupled to a distal end of the shaft. The expandable element includes multiple electrodes arranged in a hexagonal grid when the expandable element is expanded. Other embodiments are also described.

A device, system and method for temperature-based lesion formation assessment and mapping functionality using an accessory usable with an over-the-wire balloon catheter. The device may include a first annular element, a plurality of wires coupled to the first annular element, and a second annular element, the plurality of wires passing from the first annular element through the second annular element and into an elongate wire conduit coupled to the second annular element. At least one of the plurality of wires may include at least one temperature sensor and/or at least one mapping electrode. The first annular element coupled to an outer surface of a sheath. As a balloon catheter is advanced out of the sheath lumen, the distal tip of the catheter engages the second annular element and pushes the wires out of the sheath lumen, everting them over the balloon of the catheter.

Systems and methods for measuring and monitoring intracavitary tissue temperature. The system may include a catheter shaft with a circuit board disposed therein, the circuit board having an array of sensors disposed thereon. The catheter shaft may have an opening and an expandable structure surrounding the opening to provide a field of view of the intracavitary tissue for the array of sensors through the opening. The system may include a software-based programming system run on a computer such that a clinician may review information indicative of temperature of the intracavitary tissue, and be alerted if the temperature exceeds a predetermined threshold.

The subject of this disclosure is devices, systems, and uses thereof to treat a plurality of patients for paroxysmal atrial fibrillation. The solution can include delivering a multi-electrode radiofrequency balloon catheter and a multi-electrode diagnostic catheter to one or more targeted pulmonary veins; ablating tissue of the one or more targeted pulmonary veins using the multi-electrode radiofrequency balloon catheter; diagnosing the one or more targeted pulmonary veins using the multi-electrode diagnostic catheter; and achieving at least one of a predetermined clinical effectiveness and acute effectiveness of the method or use based on use of the multi-electrode radiofrequency balloon catheter and the multi-electrode diagnostic catheter in the isolation of the one or more targeted pulmonary veins.

Improved mapping and ablation procedures and corresponding devices are provided. A variety of methods and apparatuses can be used for the treatment of cardiac arrhythmias by identifying the location of an arrhythmia source and ablating that source. The methods and apparatuses can provide an improved means of electrical mapping of the heart to identify the location of the arrhythmia source and advancing an ablation electrode to that location so that it may be ablated.