37 results about "Bipolar radiofrequency" patented technology

A method of ablating an epicardial tissue region, including positioning a medical device adjacent the epicardial tissue region, the medical device having a first electrode, a second electrode, and a third electrode located in between the first and second electrodes; delivering an irrigation fluid to the tissue region; and ablating at least a portion of the tissue region by sequentially activating the third electrode in a monopolar radiofrequency delivery mode and activating the first and second electrodes in a bipolar radiofrequency delivery mode.

Methods and apparatus for treatment of layered tissue defects such as a patent foramen ovale provide for applying energy to tissues adjacent to the PFO with a closure device that substantially closes the PFO. Apparatus generally includes an elongate flexible member having a proximal end and a distal end and an energy transmission member deployable from the elongate flexible member. The energy transmission member applies energy to the layered tissue defect at a first position and a second position adjacent to the first position so as to substantially close the layered tissue defect along at least a portion of the defect. Applied energy may be monopolar or bipolar radiofrequency energy or any other suitable energy, such as laser, microwave, ultrasound, resistive heating, direct heat energy, cryogenic or the like. PFO closure via energy-based approaches of the invention may help prevent stroke, treat migraine headache, and possibly treat or prevent other medical conditions.

Methods and apparatus for treatment of patent foramen ovale (PFO) provide for applying energy to tissues adjacent the PFO with a catheter device to substantially close the PFO acutely. Apparatus generally includes a catheter device having at least one energy transmission member at or near its distal end configured to apply energy to PFO tissues to acutely, substantially close the PFO. Applied energy may be monoploar or bipolar radiofrequency energy or any other suitable energy, such as laser, microwave, ultrasound, resistive heating or the like. Some embodiments of a catheter device further include one or more tissue apposition members near the distal end for helping bring PFO tissues together, such as a PFO covering member, a vacuum applying member and/or the like. PFO closure via energy-based approaches of the invention may help prevent stroke, treat migraine headache, and possibly treat or prevent other medical conditions.

Methods and apparatus for treatment of layered tissue defects having a majority of the surfaces of the defect layers in contact generally involve use of a catheter having at least one energy transmission member at its distal end. The distal end of the apparatus also typically has a force applying member which can apply a force to the tissue defect. Often this force is a lateral force or vacuum which helps the tissue to appose itself. An exemplary method of closing a patent foramen ovale (PFO) involves positioning a closure device between layers of the PFO. Energy is then applied to the layered tissue defect with the closure device so as to substantially close the tissue defect. The energy is often monopolar or bipolar radiofrequency energy. A force may also be applied by the closure device to the layered tissue defect so as to bring the layered tissue defect together.

Large tissue regions are treated using pairs of electrode arrays. The electrode arrays may be concave and disposed in tissue so that their concave portions are opposed to each other. Axial conductors may be provided extending from the arrays and toward each other in order to increase the heating of tissues lying along the axis between the deployed electrode arrays. By properly spacing the electrode arrays apart and selecting the diameters of the arrays, desired volumes of tissue may be treated, typically with a bipolar, radiofrequency current.

A system and method for preventing unintended tissue damage from the delivery of unintended bipolar radiofrequency energy. The system may include a multi-electrode ablation device and an RF delivery unit. The RF delivery unit may transmit unipolar energy to the plurality of electrodes, the energy being in phase, with all electrodes delivering the same voltage and being activated at the same time to deliver no bipolar energy. Additionally or alternatively, the RF delivery unit may transmit bipolar energy to the electrodes. Here, voltage differences between each pair of adjacent electrodes may be monitored and the level of bipolar energy being delivered may be calculated. The voltage of energy delivered to at least one electrode in each adjacent electrode pair may be adjusted if the amount of delivered bipolar energy exceeds a safety threshold.

A device is described for treating a nasal airway by modifying a property of a nasal tissue of or near a nasal valve of the airway, without using a surgical incision or an implant, to decrease airflow resistance or perceived airflow resistance in the nasal airway. Various embodiments include an elongate shaft, a bipolar radiofrequency delivery member extending from one end of the shaft, and a handle attached to the elongate shaft at an opposite end from the radiofrequency delivery member. The radiofrequency delivery member is sized to be inserted into a nose and configured to at least temporarily deform the nasal tissue and deliver radiofrequency energy. The radiofrequency delivery member includes two rows of protruding electrodes disposed on a tissue contact surface, and the device is configured to deliver radiofrequency energy from one row of electrodes to the other row of electrodes.

The invention discloses a single-needle bipolar radiofrequency ablation electrode needle which comprises a main electrode needle body and an insulated handle pipe, wherein the front end of the insulated handle pipe is sleeved with the main electrode needle body; the insulated handle pipe is shorter than the main electrode needle body; the main electrode needle body comprises a positive electrode body, an insulator and a negative electrode body; the positive electrode body and the negative electrode body at the end parts of the main electrode needle body are arranged on two sides of the insulator in a bilateral symmetric manner, and the insulator insulates the positive electrode body and the negative electrode body; the insulated handle pipe moves in the length direction of the main electrode needle body, so that bare areas of the positive electrode body and the negative electrode body on the main electrode needle body are changed simultaneously, the electrode needle tip part of the positive electrode body or/and the negative electrode body on the main electrode needle body as well as a to-be-ablated area of the bare area of the positive electrode body or/and the negative electrode body is/are controlled by adjusting the insulated handle pipe, and further, the range of tumor radiofrequency ablation treatment is controlled. The invention provides a bare area adjusting method of the single-needle bipolar radiofrequency ablation electrode needle.

The invention relates to the field of radiofrequency medical devices, and especially relates to a monopolar and bipolar radiofrequency ablation system capable of generating stimulation. The monopolarand bipolar radiofrequency ablation system capable of generating stimulation integrates the stimulation function with the radiofrequency function to overcome a defect that existing heart radiofrequency devices needs the stimulation function, but cannot integrates in the same device in order to make a doctor switch two functions and achieve easy use. The system also can measure the bioelectrical conduction of a measuring machine in the refractory period, and effectively improves the anti-interference ability of an ECG signal by a signal processing circuit.

An electrosurgical forceps device, including a first arm having a first distal end. A second arm having a second distal end is included, the first arm and the second arm being pivotally coupled together. The first arm includes a first electrode at the first distal end and the second arm includes a second electrode at the second distal end. The first electrode and the second electrode are configured to deliver bipolar radiofrequency energy to the tissue. At least one moveable finger grip is disposed on at least one the first arm and the second arm. The device is transitionable between a first configuration, in which the first arm and the second arm are configured to grasp tissue between the first end and the second end, and a second configuration, in which at least one of the first arm and the second arm defines scissors configured to mechanically cut tissue.

The invention provides a bipolar radiofrequency treatment device with the treatment depth self-regulating function. The bipolar radiofrequency treatment device comprises a plurality of bipolar radiofrequency treatment units, each bipolar radiofrequency treatment unit comprises a radio frequency energy generator and a first radiofrequency electrode and a second radiofrequency electrodes which are uniquely connected to the radiofrequency energy generator, the first radiofrequency electrodes and the second radiofrequency electrodes are arranged on the same treatment face in a forward sequence or inverted sequence in the same direction, and the radiofrequency energy generators can exchange the polarities applied to the first radiofrequency electrodes and the second radiofrequency electrodes according to the set requirement. According to the bipolar radiofrequency treatment device, the polarities of the two radiofrequency electrodes on each bipolar radiofrequency treatment unit are controlled, the direction of radiofrequency current is controlled, and the sparse degree and penetration depth of the radiofrequency current under subcutaneous distribution can be improved, so that self-adjustment of the radiofrequency treatment depth is achieved, specific treatment is performed on some symptoms, and therefore the treatment effect and the treatment efficiency are improved.

The present invention provides a bipolar radiofrequency ablation catheter comprising a working catheter and a magnetic catheter. The magnetic catheter comprises a first tube; a magnet; a first electrode; and a first electrode connector, and the working catheter comprises a second tube; a metallic element; a second electrode; and a second electrode connector. According to the present invention, it is possible to create transmural lesions more completely and easily at a thick myocardial region such as left ventricle in which a transmural lesion could not be easily created by using conventional radiofrequency ablation catheters and thus it is expected to increase the treatment efficiency for tachycardia such as ventricular tachycardia and atrial fibrillation.