32 results about "Ablation power" patented technology

A system and method for cardiac mapping and ablation include a multi-electrode catheter introduced percutaneously into a subject's heart and deployable adjacent to various endocardial sites. The electrodes are connectable to a mapping unit, an ablation power unit a pacing unit, all of which are under computer control. Intracardiac electrogram signals emanated from a tachycardia site of origin are detectable by the electrodes. Their arrival times are processed to generate various visual maps to provide real-time guidance for steering the catheter to the tachycardia site of origin. In another aspect, the system also include a physical imaging system which is capable of providing different imaged physical views of the catheter and the heart. These physical views are incorporated into the various visual maps to provide a more physical representation. Once the electrodes are on top of the tachycardia site of origin, electrical energy is supplied by the ablation power unit to effect ablation.

A system for ablation with acoustic feedback comprises: a catheter which includes an elongated catheter body; at least one ablation element to ablate a targeted tissue region; and a pulse-echo ultrasonic transducer arranged to emit and receive an acoustic beam along a centroid in a beam direction, at a transducer beam angle of between about 30 degrees and about 60 degrees relative to a distal direction of the longitudinal axis at a location of intersection between the longitudinal axis and the beam direction of the centroid of the acoustic beam of the ultrasonic transducer, wherein the transducer transmits and receives acoustic pulses to provide lesion information in the targeted tissue region; an ablation power subsystem; an ultrasonic transmit and receive subsystem to operate the ultrasonic transducer; a control subsystem to control operation of the ablation power subsystem and the ultrasonic transmit and receive subsystem; and a display.

Methods and systems are adapted for ablation of target tissue in a living subject by predicting a lesion size that would result from placing an ablation electrode into contact with the target tissue at a particular contact force while applying energy at a given power level for a particular time interval. The prediction involves modeling the lesion size as a non-linear function of the contact force, the power level and the time interval. The prediction may be iterated by varying the contact force, the power level or the time interval until a saturation point is found, beyond which the lesion size does not increase. After it is established that one of the iterations predicts a desired lesion size, ablation of the target tissue may be conducted using the contact force, the power level and the time interval of the one iteration.

The present invention is titled "Systems and Methods for Controlling Catheter Power Based on Contact Force." The present invention discloses a method of controlling ablation power applied to a catheter, the method comprising: receiving, by a controller, a detected contact force from a sensor assembly of the catheter, the sensor assembly configured to detect application to the catheter a contact force of an electrode; controlling, by the controller, power applied to an electrode of the catheter to have a deactivated power level when the detected contact force is less than a first threshold contact force; controlling by the controller to provide The power to the electrodes of the catheter is to have a first power level when the detected contact force is greater than the first threshold contact force; and the power provided to the electrodes of the catheter is controlled by the controller to have a first power level when the detected contact force is greater than the first threshold contact force; There is a deactivated power level when the contact force is greater than the cut-off contact force, the cut-off contact force being greater than the first threshold contact force.

The invention provides a medical catheter head end capable of measuring contact force. The medical catheter head end capable of measuring contact force comprises a head end electrode, a force measuring module and a fixed connection piece. The head end electrode and the force measuring module are fixed together through the fixed connection piece. The force measuring module comprises a slider body, a rigid beam and a supporting piece fixedly connected to the rigid beam. A plurality of stretching slider components are arranged on the slider body. The rigid beam is provided with an inner cavity which is through in the axial direction. A plurality of sliding resistors are arranged on the supporting piece. The slider components correspond to the sliding resistors one to one through resistor probes installed at the tail ends of the components. During a radiofrequency operation, the medical catheter head end capable of measuring contact force judges the ablation depth by measuring pressure of the heart making contact with the catheter head end or artery tissue rich in the sympathetic nerve, reliable contact force data supporting is provided for a doctor, the doctor can select reasonable ablation power and time, and it can be guaranteed that safety of the high radiofrequency ablation operation is improved within a safety value range.

An ablation planning system includes a user interface (104) configured to allow selection of inputs for planning an ablation procedure. The user interface is further configured to include in the input a selection of an ablation probe and one or more combinations of ablation power, duration or parameters applicable to the selected probe to set the size of the ablation volume. The user interface includes a display for presenting an internal image of the patient, the display allowing visualization of the ablation volume for different entry points on the internal image. An optimization engine (106) is coupled to the user interface to receive the input and is configured to output an optimized treatment plan including spatial ablation location and temporal information of ablation to reduce collateral damage, maximize coverage area, and optimize Avoid critical structures in the target volume.

The invention discloses a method for evaluating the lightning current ablation ability of a grounding wire in a transmission line. The method comprises: by testing the relationship between the cross-section size of different wires, the diameter of a single strand of a wire, the magnitude of a lightning current, the type of a lightning current waveform, and the residual breaking force, respectively, and the lightning current ablation ability of a grounding wire in a transmission line , obtaining quantitative evaluation data of 5 aspects, comprehensively evaluating the lightning current ablationability of the grounding wire in the transmission line , and providing technical support for the lightning-proof selection of the grounding wire in the transmission line, therefore ensuring the safeand stable operation of the power grid.

The present invention provides a catheter system that allows proper perfusion maneuvers. The catheter system 5 includes an ablation catheter 1 having an irrigation mechanism, a power supply unit 32 for supplying power for ablation to the ablation catheter 1 , a liquid supply unit 21 for supplying an irrigation liquid to the ablation catheter 1 , and a control unit 35 . When the actual measured power Pm during ablation is in a high power state equal to or greater than the threshold power Pth, the control unit 35 controls a large flow rate operation; traffic action. In addition, when switching from a low power state to a high power state, the small flow rate operation is quickly switched to a large flow rate operation; on the other hand, when switching from a high power state to a low power state, the low power state continues during the transition. In the case of the first standby time, the high flow rate operation is switched to the low flow rate operation after the first standby time is maintained.