Abstract: A transmitting element for generating a magnetic field for tracking of an object includes a first spiral trace that extends from a first outer origin inward to a central origin in a first direction. A second spiral trace can extend from the central origin outward to a second outer origin in the first direction. The second spiral trace can extend from the central origin to the second outer origin in the first direction. The first spiral trace and the second spiral trace can be physically connected at the central origin to form the fluorolucent magnetic transmitting element and at least a portion of the first spiral trace overlaps at least a portion of the second spiral trace.

Abstract: A transmitting element for generating a magnetic field for tracking of an object includes a first spiral trace that extends from a first outer origin inward to a central origin in a first direction. A second spiral trace can extend from the central origin outward to a second outer origin in the first direction. The second spiral trace can extend from the central origin to the second outer origin in the first direction. The first spiral trace and the second spiral trace can be physically connected at the central origin to form the fluorolucent magnetic transmitting element and at least a portion of the first spiral trace overlaps at least a portion of the second spiral trace.

Abstract: Methods include capturing intravascular ultrasound images. A drive motor is used to actively drive an ultrasound transducer at a set rotation speed. A temporary sensing window is created in which the ultrasound transducer is driven with a fixed drive signal. A plurality of signals from are received the ultrasound transducer during the temporary sensing window.

Abstract: The present disclosure is directed to a system and method for measuring impedance across a plurality of electrodes and assessing proximity or contact between electrodes of a medical device and patient tissue. In one embodiment, contact is assessed individual electrodes and cardiac tissue using bipolar electrode complex impedance measurements. Initially, baseline impedance values are established for each of the individual electrodes based on the responses of the electrodes to the applied drive signals. After establishing the baseline impedance values a series of subsequent impedance values are measured for each electrode. For each electrode, each subsequent impedance value may be compared to a previous baseline impedance value for that electrode. If a subsequent impedance value is less than the baseline impedance value for a given electrode, the baseline impedance value may be reset to the subsequent impedance value.

Abstract: A transmitting element for generating a magnetic field for tracking of an object includes a first spiral trace that extends from a first outer origin inward to a central origin in a first direction. A second spiral trace can extend from the central origin outward to a second outer origin in the first direction. The second spiral trace can extend from the central origin to the second outer origin in the first direction. The first spiral trace and the second spiral trace can be physically connected at the central origin to form the fluorolucent magnetic transmitting element and at least a portion of the first spiral trace overlaps at least a portion of the second spiral trace.

Abstract: Systems and methods for monitoring return patch impedances are provided. A tissue therapy system includes a catheter comprising at least one electrode, the catheter implantable in a patient, a first return patch electrode configured to be applied to skin of the patient, a second return patch electrode configured to be applied to the skin of the patient, and an impedance measuring circuit lectrically coupled to the at least one catheter electrode, the first return patch electrode, and the second return patch electrode. The impedance measuring circuit is configured to drive currents between the at least one catheter electrode, the first return patch electrode, and the second return patch electrode, detect, using a voltage at the at least one catheter electrode as a reference voltage, voltages generated in response to the driven currents, and measure impedances based on the driven currents and the detected voltages.

Abstract: A transmitting element for generating a magnetic field for tracking of an object includes a first spiral trace that extends from a first outer origin inward to a central origin in a first direction. A second spiral trace can extend from the central origin outward to a second outer origin in the first direction. The second spiral trace can extend from the central origin to the second outer origin in the first direction. The first spiral trace and the second spiral trace can be physically connected at the central origin to form the fluorolucent magnetic transmitting element and at least a portion of the first spiral trace overlaps at least a portion of the second spiral trace.

Abstract: A system and method measures impedance across a plurality of electrodes and assesses proximity or contact between electrodes of a medical device and patient tissue. Contact is assessed between individual electrodes and cardiac tissue using bipolar electrode complex impedance measurements. Initially, baseline impedance values are established for each of the individual electrodes based on the responses of the electrodes to the applied drive signals. After establishing the baseline impedance values a series of subsequent impedance values are measured for each electrode. For each electrode, each subsequent impedance value may be compared to a previous baseline impedance value for that electrode. If a subsequent impedance value is less than the baseline impedance value for a given electrode, the baseline impedance value may be reset to the subsequent impedance value. Such systems and method are particularly applicable to medical devices having numerous electrodes.

Abstract: A system and method measures impedance across a plurality of electrodes and assesses proximity or contact between electrodes of a medical device and patient tissue. Contact is assessed between individual electrodes and cardiac tissue using bipolar electrode complex impedance measurements. Initially, baseline impedance values are established for each of the individual electrodes based on the responses of the electrodes to the applied drive signals. After establishing the baseline impedance values a series of subsequent impedance values are measured for each electrode. For each electrode, each subsequent impedance value may be compared to a previous baseline impedance value for that electrode. If a subsequent impedance value is less than the baseline impedance value for a given electrode, the baseline impedance value may be reset to the subsequent impedance value. Such systems and method are particularly applicable to medical devices having numerous electrodes.

Abstract: The present disclosure is directed to measuring impedance across a plurality of electrode pairs. The disclosed systems and methods may simultaneously provide drive signals between electrode pairs and then sense the voltage signals that develop at the electrodes. Digital signal processing may be used to synchronously demodulate the voltage signal at each electrode to determine impedances at the electrodes. Each electrode pair may be driven at a unique frequency to allow for significantly increasing a number of electrode pairs and/or increasing drive current magnitudes. Synchronous demodulation allows the unique frequencies to be detected independent of each other while minimizing crosstalk. Typically, the drive frequencies are made orthogonal by setting the drive frequencies at harmonics of a common base frequency and measuring a response over an integer number of cycles.

Abstract: The present disclosure is directed to interleaving electrical noise generating operations with impedance measurements in a medical localization system. The systems and methods continuously and simultaneously provide unique frequency drive signals, which are harmonics of a common base frequency, across electrode patches to generate an electrical field. Response signals electrodes in the electric field are measured and synchronously demodulated. A demodulated data stream is then filtered (e.g., decimated) to generate impedance-based values proportional to the location of the electrode for each unique frequency. The demodulated data stream into the filter is paused to allow operation of an electrical noise generating device such a magnetic field-based localization system. More specifically, the data stream is paused for a time period equal to an integer multiple of a base period of the common base frequency. This allows resuming filtering of the demodulated data stream free of any frequency discontinuity.

Abstract: The present disclosure is directed to measuring impedance across a plurality of electrode pairs. The disclosed systems and methods may simultaneously provide drive signals between electrode pairs and then sense the voltage signals that develop at the electrodes. Digital signal processing may be used to synchronously demodulate the voltage signal at each electrode to determine impedances at the electrodes. Each electrode pair may be driven at a unique frequency to allow for significantly increasing a number of electrode pairs and/or increasing drive current magnitudes. Synchronous demodulation allows the unique frequencies to be detected independent of each other while minimizing crosstalk. Typically, the drive frequencies are made orthogonal by setting the drive frequencies at harmonics of a common base frequency and measuring a response over an integer number of cycles.

Abstract: Aspects of the present disclosure are directed to intravascular electrophysiology catheters which utilize electrodes on flexible electronic circuit(s) to facilitate reduced assembly complexity and cost. In one example embodiment, a distal tip assembly of an electrophysiology catheter is disclosed. The distal tip assembly including a catheter shaft, flexible circuitry, and a distal tip coupled to a distal end of the catheter shaft. The catheter shaft includes an outer surface with a trench extending into the outer surface, and the flexible circuitry is inserted into the trench and coupled to the catheter shaft. The flexible circuitry includes one or more electrodes configured and arranged to sense electrophysiological characteristics of tissue.

Abstract: Disclosed herein is an ablation system that includes a catheter electrode, a return patch electrode adapted for attachment to a patient's skin, an ablation generator electrically coupled to the catheter electrode and the return patch electrode and configured to supply ablative energy thereto, and a controller communicatively coupled to the return patch electrode and the ablation generator. The return patch electrode includes a temperature sensing circuit comprising a plurality of discrete temperature sensors arranged across the return patch electrode.

Abstract: The present disclosure is directed to measuring impedance across a plurality of electrode pairs. The disclosed systems and methods may simultaneously provide drive signals between electrode pairs and then sense the voltage signals that develop at the electrodes. Digital signal processing may be used to synchronously demodulate the voltage signal at each electrode to determine impedances at the electrodes. Each electrode pair may be driven at a unique frequency to allow for significantly increasing a number of electrode pairs and/or increasing drive current magnitudes. Synchronous demodulation allows the unique frequencies to be detected independent of each other while minimizing crosstalk. Typically, the drive frequencies are made orthogonal by setting the drive frequencies at harmonics of a common base frequency and measuring a response over an integer number of cycles.

Abstract: A method of detecting a localization element/sheath state change with a localization system includes establishing a localization field using a plurality of localization field generators, obtaining first and second localization signals from first and second catheter-borne localization elements within the localization field, respectively, comparing the quadrature components of the first and second localization signals, and detecting a localization element/sheath state change for one of the catheter-borne localization elements based on the comparison between quadrature components. For example, withdrawal of a localization element into an introducer sheath can be detected when the comparison between quadrature components exceeds a preset amount. Conversely, re-emergence of the localization element from the introducer sheath can be detected when the comparison between quadrature components returns below the preset amount.

Abstract: A multiple thermocouple assembly with a reduced wire count is configured for use in an ablation catheter tip. In at least one embodiment, the assembly comprises a first metal material comprising a plurality of junctions; a plurality of conductors comprising a second metal material, each conductor connected to the first metal material at one of the plurality of junctions; and a common conductor that is physically paired with at least one of the plurality of conductors at a corresponding common conductor junction such that the common conductor forms a thermocouple pair with each of the plurality of conductors.

Abstract: The present disclosure is directed to measuring impedance across a plurality of electrode pairs. The disclosed systems and methods may simultaneously provide drive signals between electrode pairs and then sense the voltage signals that develop at the electrodes. Digital signal processing may be used to synchronously demodulate the voltage signal at each electrode to determine impedances at the electrodes. Each electrode pair may be driven at a unique frequency to allow for significantly increasing a number of electrode pairs and/or increasing drive current magnitudes. Synchronous demodulation allows the unique frequencies to be detected independent of each other while minimizing crosstalk. Typically, the drive frequencies are made orthogonal by setting the drive frequencies at harmonics of a common base frequency and measuring a response over an integer number of cycles.

Abstract: An ablation generator may include an input port for receiving a monitoring signal respective of tissue of the patient and an output port for providing the monitoring signal another device. A filtering circuit may be disposed between the input port and the output port, the filtering circuit configured to present a high impedance at one or more frequencies at or near which a mapping and navigation system associated with the ablation generator transmits a signal. The filtering circuit may additionally or alternatively be provided in a monitoring system or another component in an electrophysiology system.

Abstract: A transmitting element for generating a magnetic field for tracking of an object includes a first spiral trace that extends from a first outer origin inward to a central origin in a first direction. A second spiral trace can extend from the central origin outward to a second outer origin in the first direction. The second spiral trace can extend from the central origin to the second outer origin in the first direction. The first spiral trace and the second spiral trace can be physically connected at the central origin to form the fluorolucent magnetic transmitting element and at least a portion of the first spiral trace overlaps at least a portion of the second spiral trace.