Embodiments of the present disclosure include a method for determining a shape of a catheter. The method can include receiving a plurality of impedance measurements from a plurality of electrodes disposed on a flexible tip portion of the catheter. The method can include receiving a magnetic position measurement from a magnetic position sensor disposed on a shaft of the catheter. The method can include determining a relationship between each of the plurality of electrodes disposed on the flexible tip portion of the catheter, based on the impedance measurements received from the plurality of electrodes. The method can include predicting a shape of the flexible tip portion of the catheter, based on the determined relationship between each of the plurality of electrodes disposed on the flexible tip portion of the catheter. The method can include determining a shape of the catheter, based on the magnetic position measurement and the predicted shape of the flexible tip portion.

An examination diagnosis device includes a probe, a stress detector and a grip. The probe has an elongated portion and a tip portion, and the tip portion is provided to be bent at one end of the elongated portion. The stress detector is configured to be able to detect a force in an X direction, a force in a Y direction and a force in a Z direction applied to the tip portion of the probe. The tip portion of the probe may be bent in a plane parallel to the X direction and the Z direction. A user allows the tip portion of the probe to come into contact with a joint portion that is a subject of examination and diagnosis while gripping the grip.

Cardiac mapping catheters and methods for using the catheters are described. The catheter can detect the presence, direction and/or source of a depolarization wave front associated with cardiac arrhythmia. A mapping catheter includes a plurality of bipolar electrode pairs in which the members of each pair are opposed to one another across a perimeter, for instance in a circular pattern (compass mode). The spaced arrangement of the electrodes can be utilized to identify directional paths of moving electric fields or wave fronts in any direction passing across the endocardial surface. Double potential (DP) recordings in compass mode can provide a regional assessment for the existence of rotational activity. Simultaneous DP recordings in compass mode, narrow-adjacent bipolar, and unipolar recording provide an accurate assessment of the time, location, and path that a rotational mechanism breaches a perimeter of electrodes. Accurate time, location, and path of perimeter breaches can be used to electrically track rotational mechanisms during atrial fibrillation.

Catheter-based devices and methods for continuously monitoring vascular lumen dimensions, in particular in the inferior vena cava (IVC) for determining heart failure and/or fluid status of a patient. Related therapy systems and methods for integrated monitoring and therapy are also disclosed.

A catheter has a distal assembly with at least one loop with ring electrodes. A single continuous puller wire for bidirectional deflection is pre-bent into two long portions and a U-shape bend therebetween. The U-shape bend is anchored at a distal end of a deflectable section which is reinforced by at least one washer having at least two holes, each hole axially aligned with a respective lumen in the deflectable section. Each hole is centered with a lumen so that each puller wire portion therethrough is straight and subjected to tensile force only. A proximal end of the support member is flattened and serrated to provide a better bonding to the distal end of the deflectable section.

A steerable sheath includes an inner liner extending from a proximal to a distal end of the steerable sheath. The inner liner includes a non-deflectable portion and a deflectable portion. The steerable sheath includes a first pull wire positioned along a first helical path around the circumference of the inner liner from a proximal to a distal end of the non-deflectable portion and along a first straight path from a proximal to a distal end of the deflectable portion. The steerable sheath includes a second pull wire positioned along a second helical path around the circumference of the inner liner from the proximal to the distal end of the non-deflectable portion and along a second straight path from the proximal to the distal end of the deflectable portion. The steerable sheath may also include electrode wires present in a helical or spiral pattern around the circumference of the steerable sheath.

This disclosure relates to electrophysiology cardiac ablation devices, methods, and systems. In particular, this disclosure relates to devices, methods, and systems that create a reversible non-ablative blockade of cardiac tissue, test the cardiac tissue, and ablate the cardiac tissue.

An apparatus includes a handle, a catheter, and an end effector. The catheter extends distally from the handle. The catheter includes a body, a first cable, a second cable, and a third cable. The first cable is positioned in a first lumen of the catheter body and is operable to translate relative to the body of the catheter. The second cable is positioned in a second lumen of the catheter body and is operable to translate relative to the body of the catheter. The third cable is positioned in a third lumen of the catheter body and is operable to translate relative to the body of the catheter. The end effector extends distally from the catheter. The end effector includes at least one electrode.

A catheter has a distal assembly with at least one loop with ring electrodes. A single continuous puller wire for bidirectional deflection is pre-bent into two long portions and a U-shape bend therebetween. The U-shape bend is anchored at a distal end of a deflectable section which is reinforced by at least one washer having at least two holes, each hole axially aligned with a respective lumen in the deflectable section. Each hole is centered with a lumen so that each puller wire portion therethrough is straight and subjected to tensile force only. A proximal end of the support member is flattened and serrated to provide a better bonding to the distal end of the deflectable section.

Methods, systems, devices, assemblies and apparatuses for treatment of hypertension in a patient using renal denervation. The therapeutic assembly includes an energy delivery element. The energy delivery element is configured to provide renal denervation energy to a nerve within a blood vessel of a patient. The therapeutic assembly includes a controller. The controller is coupled to the energy delivery element. The controller is configured to determine that the hypertension in the patient is orthostatic. The controller is configured to apply renal denervation energy to the patient using the energy delivery element.