Provided is a multiple-electrode monorail guide catheter for use in vascular insertion, including: an elongated catheter main body having a proximal end and a distal end; a guidewire inlet opening on the distal end; a guidewire outlet opening; an operation tube; a terminal unit on the proximal end; an electrode assembly having a double-lumen structure composed of an outer tube having electrodes on an outer surface of the outer tube and an inner tube independently provided from the outer tube, allowing insertion of a guidewire, having an outer diameter smaller than an inner diameter of the outer tube, and being accommodated within an outer tube lumen; a clearance defined by the outer tube luminal surface and an inner tube outer circumferential surface; and lead wires extending from the electrodes to the terminal unit on the proximal end and being inserted into the lumen of the outer tube.

A system and method for detecting and verifying bradycardia/asystole episodes includes sensing an electrogram (EGM) signal. The EGM signal is compared to a primary threshold to sense events in the EGM signal, and at least one of a bradycardia or an asystole is detected based on the comparison. In response to detecting at least one of a bradycardia or an asystole, the EGM signal is compared to a secondary threshold to sense events under-sensed by the primary threshold. The validity of the bradycardia or the asystole is determined based on the detected under-sensed events.

A catheter has a body including a proximal region, a neck region, and a distal region. A shaping wire is disposed within the distal region to predispose it into at least a partial loop, which may have a fixed or variable radius of curvature. The shaping wire includes a distal portion having a circular transverse cross-sectional shape and a proximal portion having a non-circular (e.g., rectangular) transverse cross-sectional shape. The proximal portion of the shaping wire can have a width-to-thickness ratio of at least about 4, such as about 4.67. A transition portion can promote a gradual transition from the circular to the non-circular transverse cross-sectional shape, for example by increasing a width of the shaping wire by about 0.001″ and/or by decreasing a thickness of the shaping wire by about 0.001″ for every about 0.004″ in length through the transition portion.

A medical device system and method for detecting dislodgement of a ventricular lead determines one or more characteristics of a cardiac signal received via the ventricular lead that are associated with dislodgement of the ventricular lead during atrial fibrillation, and detects dislodgement of the ventricular lead based on the determined characteristics. The medical device and system provides a lead dislodgment alert in response to detecting dislodgement. In some examples, an implantable medical device withholds delivery of a ventricular defibrillation therapy based on detecting dislodgement of the ventricular lead.

Methods, implantable medical devices and systems configured to perform analysis of captured signals from implanted electrodes to identify cardiac arrhythmias. In an illustrative embodiment, signals captured from two or more sensing vectors are analyzed, where the signals are captured with a patient in at least first and second body positions. Analysis is performed to identify primary or default sensing vectors and/or templates for event detection.

Electrodes are used to measure an electrical signal (e.g., an electrogram). One or more filters are applied to the electrical signal to generate one or more filtered signals. Features of the filtered signals are evaluated to assess a sharpness corresponding to the electrical signal. Based on the sharpness, various characteristics of a morphology of the electrogram may be evaluated over a time period.

Diagnostic apparatus (24) includes a sealed case (40), including a biocompatible material and configured for implantation within a body of a human subject (22). At least one antenna (42) is configured to be implanted in the body in proximity to a target tissue (28) and to receive radio frequency (RF) electromagnetic waves propagated through the target tissue and to output a signal in response to the received waves. Processing circuitry (44,46), which is contained within the case, us coupled to receive and process the signal from the antenna so as to derive and output an indication of a characteristic of the target tissue.

Disclosed herein are methods of treating cardiac arrhythmia with electronic monitoring in a timely manner. Also disclosed herein are systems for electronic monitoring of cardiac arrhythmia.

The present disclosure provides a catheter grip device that secures to a catheter shaft and provides easier manipulation of the catheter shaft for the user. For example, the catheter shaft, such as for an Electrophysiology catheter, may insert into a patient's blood vessel. From here, the user, such as the physician, may need to manipulate, re-position, rotate, or otherwise maneuver a distal end of the catheter shaft while inserted inside the patient's blood vessel. In this regard, by the catheter grip being securely attached to the catheter shaft, the user is able to manipulate, rotate, etc. the catheter shaft by rotating and manipulating the catheter grip. The catheter grip reduces strain on the various muscles of the user's hand, and also provides more accurate manipulation of the catheter shaft.

A system and method for mapping an anatomical structure includes sensing activation signals of physiological activity with a plurality of mapping electrodes disposed in or near the anatomical structure. Patterns among the sensed activation signals are identified based on a similarity measure generated between each unique pair of identified patterns which are classified into groups based on a correlation between the corresponding pairs of similarity measures. A characteristic representation is determined for each group of similarity measures and displayed as a summary plot of the characteristic representations.