A system and method for positioning sheaths into the Coronary Sinus using a guiderail catheter.

A medical device system is configured to guide implantation of a pacing electrode for left bundle branch pacing. The system includes a medical device having a processor configured to receive at least one cardiac electrical signal, determine a feature of the cardiac electrical signal, compare the feature to left bundle branch signal criteria, and determine a left bundle branch signal in response to the feature meeting the left bundle branch signal criteria. The system includes a display unit configured to generate a user feedback signal indicating advancement of a pacing electrode into a left portion of a ventricular septum in response to the processor determining the left bundle branch signal.

A medical device system is configured to guide implantation of a pacing electrode for left bundle branch pacing. The system includes a medical device having a processor configured to receive at least one cardiac electrical signal, determine a feature of the cardiac electrical signal, compare the feature to left bundle branch signal criteria, and determine a left bundle branch signal in response to the feature meeting the left bundle branch signal criteria. The system includes a display unit configured to generate a user feedback signal indicating advancement of a pacing electrode into a left portion of a ventricular septum in response to the processor determining the left bundle branch signal.

A leadless pacing device may include a housing having a proximal end and a distal end, and a set of one or more electrodes supported by the housing. The housing may include a first a distal extension extending distally from the distal end thereof. One or more electrodes may be supported by the distal extension. The leadless pacing device may be releasably coupled to an expandable anchor mechanism.

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.

The composite electrode type intracardiac defibrillation catheter of the present invention includes a first electrode group including two or more first electrodes for detecting an electrophysiological electrical signal of a site or a cell group in a heart chamber, and a second electrode group including one or more second electrodes located between adjacent two of the first electrodes for causing an electric current by a high-voltage defibrillation electric shock for defibrillation to flow in a contact site in the heart chamber or in contact sites in the heart chamber and in a vein, and a conductive length of a surface of the second electrode in a longitudinal direction of the catheter shaft is longer than the conductive length of the first electrode.

Devices and methods for treating tricuspid regurgitation (TR) are provided. A clasp or clamp is used to anchor a TR-treatment device to an existing lead of a pacemaker or an implantable cardioverter defibrillator (ICD) that passes through the tricuspid valve. The TR-treatment device can be a balloon occluder that is adjustable by filling or withdrawing filler material from the occluder through a proximal port implanted in the skin of the patient.

Disclosed herein is a catheter for delivering an implantable medical lead to an implantation site near an ostium leading to a proximal region of a coronary sinus. The catheter includes a distal end, a proximal end opposite the distal end, a tubular body extending between the distal and proximal ends, an atraumatic fixation structure defining a distal termination of the distal end, and a lead receiving lumen. The atraumatic fixation structure is configured to enter the ostium and passively pivotally anchor with the proximal region of the coronary sinus. The lead receiving lumen extends along the tubular body from the proximal end to an opening defined in a side of the tubular body near the distal end and proximal the atraumatic fixation structure.

A lead delivery apparatus and a method of delivering a medical lead to an anatomic target site. The method includes inserting a hydraulic plug into an internal delivery lumen of a delivery shaft, and coupling a medical lead to the hydraulic plug. Hydraulic pressure is applied to the hydraulic plug through the delivery lumen, thereby moving the hydraulic plug toward an anatomic target site, and advancing the medical lead toward the target site.

Apparatus and methods are described for use with a blood vessel of a subject. An annular antenna is placed inside the blood vessel such that radial expansion of the antenna is limited by a circumference of the blood vessel. A transmitter generates an inductive current in the antenna, by transmitting RF energy toward the antenna. A control unit measures the inductive current in the antenna, and, in response thereto, determines a physiological parameter of the subject. Other applications are also described.