摘要:
A catheter with a variable circular loop is responsive to a contraction wire for increasing the coiling of the circular loop. The shape of the loop is supported by an elongated member, wherein a radially constrictive sleeve confines the contraction wire to extends immediately alongside the length of elongated member so as to improve uniformity and minimize misshaping of the loop during contraction.
摘要:
A catheter includes a proximal shaft and a distal shaft having differing diameters; often, the distal shaft will have a smaller diameter than the proximal shaft. A coupling joins the distal shaft to the proximal shaft. For example, a proximal portion of the distal shaft can be inserted into the coupling through its distal end, while the proximal portion of the coupling can be inserted into the proximal shaft through its distal end. To provide an atraumatic transition from the distal shaft to the proximal shaft, coupling can taper towards its distal end, for example by using a dome- or frustoconical-shape for the distal portion of the coupling. The exterior of the coupling can be ribbed to facilitate bonding to the proximal shaft. The distal shaft can be formed into at least a partial loop having a fixed or variable radius of curvature.
摘要:
An electrophysiologic device may be constructed with an elongated body having proximal and distal ends a lumen. At least one coil may be formed around a distal portion of the elongated body from a plurality of helical wraps of a continuous wire that extends to the proximal end of the elongated body through the lumen. One or more coils may be provided and each may be configured to function as either a ring electrode or a location sensor.
摘要:
A tissue segmentation device, controller, and methods therefore are disclosed. The device has an active electrode, a return electrode, a mechanical force application mechanism, voltage and current sensors, and a controller. The controller is configured to control a power output of the segmentation device. The controller has a processing component, responsive to the sensors, configured to execute the following: (a) derive a power factor of power applied to the at least one electrode; and (b) responsive to the deriving a power factor, assign a circuit status to a circuit comprising the at least one electrode. IF (PF≈0) and ((Vrms/Irms)≧T), THEN the circuit status is “open”. IF (PF≈0) and ((Vrms/Irms)
摘要:
Disclosed are a radio-frequency ablation catheter having a spiral structure and equipment thereof. The radio-frequency ablation catheter has a long strip-shaped catheter body. A spiral electrode support is arranged at the front end of the catheter body. Multiple electrodes (2) are arranged on the electrode support. A control handle (8, 20) is arranged at the rear end of the catheter body. Wall-attachment adjusting wires (6) having various structures can be arranged in the radio-frequency ablation catheter, so that the radio-frequency ablation catheter having a spiral structure can be adapted to target lumens of different diameters, and so that the electrodes (2) on the electrode support have a good wall-attachment state.
摘要:
An ablation catheter, wherein the catheter includes: a flexible elongated member having a proximal end and a distal end, wherein the elongated member defines an irrigation lumen along its length and the elongated member encapsulates at least one wire; and wherein at least one electrode is attached to the outer surface of the elongated member near to the distal end and the at least one electrode is electrically connected to at least one wire and wherein the at least one electrode includes a plurality of holes that is in fluid communication with the irrigation lumen.
摘要:
Method, system and apparatus to detect, diagnose and treat biological rhythm disorders. In preferred particularly desirable embodiment relating to the real-time detection of heart rhythm disorders, this invention identifies localized sources for complex rhythms including atrial fibrillation to guide the localized application of energy to modify the source and treat the rhythm disorder.
摘要:
The present disclosure provides for a device and methods of use to endoluminally ablate and/or occlude a body vessel using a radiofrequency ("RF") signal and a current to perform resistive heating. The device may have a RF mode and a resistive mode, and may perform each mode in sequential order until the vessel is fully occluded. The device further comprises a control unit to operate the device in its various modes. The device may be provided in a system including an occlusive element, such as a balloon catheter, to prevent blood flow through the ablation/occlusion site.
摘要:
Tissue regions are treated using a multiple lead electrode probe. A plurality of electrodes may be disposed about an elongate shaft. The elongate shaft may be slidably disposed within a lumen of a delivery sheath. One or more probes including one or more electrically active regions may also be slidably disposed within the delivery sheath. The one or more probes may be configured to extend radially about the elongate shaft. The plurality of electrodes and the electrically active regions may be individually connected to a control and power unit through individual channels.