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.

The invention provides an output control method and device of radio frequency ablation power, and a radio frequency ablation system. The output control method of radio frequency ablation power comprises the following steps: when a starting signal is received, controlling a radio frequency energy generator to output a preset ablation power, recording the ablation time and obtaining actual ablationparameters, wherein the actual ablation parameters comprise actual impedance; when the actual impedance meets any one of a first preset condition and a second preset condition, controlling the radio frequency energy generator to stop output of the ablation power, recording the sleep time and stopping recording the ablation time; and if the sleep time exceeds a sleep time threshold value, controlling the radio frequency energy generator to continue to output the ablation power again, and continuing to record the ablation time. The first preset condition is R>K1*Rmin1, and the second preset condition is R>K2*Rmin2. The method can enable the impedance of an ablation part to be in an intermittent stable change state, and continuous output of the radio frequency energy can be ensured, so that radio frequency ablation can be relatively and uniformly carried out in a circulating mode.

The invention discloses an ablation simulation method based on data fitting, and the method comprises the steps: calculating the actual measurement average values of short-diameter and long-diameter data of an ablation boundary under the same ablation power and ablation time, carrying out the thermal field simulation of a target region, and taking the short-diameter data as the reference, and taking the long diameter corresponding to a contour line where a temperature threshold is located as a long-diameter simulation value; under low ablation power, establishing a temperature threshold and ablation power relation model; under high ablation power, establishing a temperature threshold and ablation time relation model and a relation model of the correction coefficient and the ablation power; inputting ablation power and ablation time, selecting a temperature threshold and ablation power relation model or a temperature threshold and ablation time relation model according to the ablationpower to obtain a temperature threshold, obtaining a corresponding ablation simulation image according to the temperature threshold, and correcting the long diameter of the ablation simulation image by utilizing a correction coefficient and ablation power relation model. The method can accurately simulate the ablation boundary.

Electrosurgical instruments are configured to provide increased ablative capability without requiring increased current density at the electrode. The electrosurgical instrument includes an elongate probe having a handle portion and a distal end. An electrode is disposed at the distal end and is configured to ablate tissue. The instrument includes an aspiration lumen, e.g., that may open through the electrode, at the distal end to aspirate fluid, tissue debris, and gaseous bubbles through the aspiration lumen. The electrosurgical instrument includes a user operable control (e.g., button) on the handle portion for selectively placing the instrument in boosted ablation mode, which can be achieved by restricting aspiration of fluid through the aspiration lumen, reducing active cooling of the electrode, and causing increased ablative sparking density at the electrode (e.g., by at least 10%, 20%, 35%, or 50%).

The invention provides an electric surgery apparatus and a method for controlling the electric surgery apparatus. A high-frequency ablation power supply (2) is an electric surgery apparatus for bonding biological tissues. The electric surgery apparatus includes a high-frequency power supplying section for supplying a high-frequency power which is applied to biological tissues, a detecting section for detecting the voltage and current of the high-frequency power outputted from the high-frequency power supplying section, an impedance calculating section for calculating from the voltage and current values detected by the detecting section the impedance between a pair of electrodes (3a) which holds the biological tissues and to which the high-frequency power is supplied, and a control section (18) for controlling the supply and substantial stop of the high-frequency power from the high-frequency power supplying section depending on whether or not the impedance calculated by the impedance calculating section has exceeded a predetermined value twice.

Apparatus, consisting of a power supply having a first electrical connection to a relatively high voltage source and connectable to ablation circuitry in a catheter via a second electrical connection. There are rechargeable first and second subsidiary power sources in the power supply. The apparatus also has a control unit, and a first switch alternately connecting the ablation circuitry to the first and second subsidiary power sources responsively to control signals from the control unit. The apparatus also has a second switch alternately connecting one of the first and second subsidiary power sources to the high voltage source for recharging thereof responsively to the control signals while the one of the first and second subsidiary power sources is disconnected from the ablation circuitry and another of the first and second subsidiary power sources is connected to the ablation circuitry by the first switch.

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 belongs to the technical field of medical instruments, and particularly relates to a method capable of predicting arrhythmia radiofrequency ablation injury depth in real time and a radiofrequency ablation instrument. According to the method, a particle swarm optimization back propagation (PSO-BP) neural network is adopted to predict the ablation injury depth, and the quantitative relation between three radiofrequency ablation parameters including ablation time, electrode-tissue contact pressure (CF) and ablation power and the ablation injury depth is established through machine learning; the ablation depth index corresponding to the ablation injury depth is obtained from the three radiofrequency ablation parameters. And then the ablation depth index model is transplanted into a radiofrequency ablation instrument, a doctor is assisted to accurately control the ablation depth in the arrhythmia radiofrequency ablation implementation process, and the method has a clinical application prospect.

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.