42 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 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.

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.

An ablation planning system includes a user interface (104) configured to permit selection of inputs for planning an ablation procedure. The user interface is further configured to incorporate selection of ablation probes and one or more combinations of ablation powers, durations or parameters applicable to selected probes in the inputs to size the ablation volumes. The user interface includes a display for rendering internal images of a patient, the display permitting visualizations of the ablation volumes for different entry points on the internal images. An optimization engine (106) is coupled to the user interface to receive the inputs and is configured to output an optimized therapy plan which includes spatial ablation locations and temporal information for ablation so that collateral damage is reduced, coverage area is maximized and critical structures are avoided in a planned target volume.

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 present invention discloses a transcatheter interventional atrial septostomy device. The transcatheter interventional atrial septostomy device comprises a catheter body and a radially expandable balloon sleeving and fixed on a distal end of the catheter body; the balloon is provided with a stoma portion for passing through atrial septum and radially expanding to open the atrial septum tissue,and the stoma portion is at least provided with electrode assemblies electrically connected to ablation power sources and control mechanisms along a circumferential direction on an outer surface of the balloon; and the catheter body is axially provided with a guide wire chamber with both ends in a penetrating manner and a filling chamber for filling the balloon. Aiming at defects that in the priorart, tear and damage of heart tissues and stoma retraction after surgery are easily caused and arranged shunt devices lead to embolization, the transcatheter interventional atrial septostomy device is controllable in stoma sizes and free of retraction and does not cause the tear and damage of the heart tissues.

The invention provides a medical catheter head end capable of measuring contact force. The medical catheter head end comprises an electrode head and a force measuring device, a plurality of blind holes are formed in the electrode head, the force measuring device comprises a plurality of piezoelectric ceramic spring sensors, a base and a plurality of tail lines, and a plurality of through holes are formed in the base. A deformation member and sensors are combined and simplified to be in a two-in-one mode, so that assembly difficult and error are reduced, and accuracy of a force measuring head end is improved. Pressure when the catheter head end contacts with a heart or arterial tissue rich in sympathetic nerve is measured to ensure the pressure to be within a safe range so as to improve safety of high-radio-frequency ablation operation; during the ablation operation, ablation depth can be judged by measuring the pressure when the catheter head end contacts with the tissue, and reliable data support can be provided for doctors to select reasonable ablation power and time.

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.

The invention discloses a pressure regulator for a heart chamber which comprises a radially contractable and expandable axially penetrating atrial septal passage; a first positioning portion and a second positioning portion respectively abutting against the wall surfaces of both sides of the atrial septum are arranged in the axial direction of the atrial septum passage; at least that first position portion and / or the second positioning portion are provide with an electrically conductive portion abutting against the atrial septum tissue and electrically conducting with the ablation power source, and the electrically conductive portion conduct electricity at least on a surface in contact with the atrial septum tissue. The first positioning portion and / or the second positioning portion are provided with an electrically conductive portion abutting against the atrial septum tissue and electrically conducting with the ablation power source. The invention can prevent the problem that the passage of the atrial septum is closed due to the endothelial creeping of the atrial septum, and avoid the pressure regulating device from losing the function of shunting.

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.

The invention provides a system and a method for controlling a catheter power based on a contact force. A method for controlling an ablation power applied to a catheter includes: receiving, by a controller, a detected contact force from a sensor assembly of the catheter, the sensor assembly being configured to detect a contact force applied to the electrode; controlling, by the controller, a power supplied 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, the power supplied to the electrode of the catheter to have a first power level when the detected contact force is greater than the first threshold contact force; and controlling, by the controller, the power supplied to the electrode of the catheter to have a deactivated power level when the detected contact force is greater than a cutoff contact force, the cutoff 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.

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 invention discloses a magnetic resonance compatibility radio-frequency ablation apparatus and an ablation needle. The ablation apparatus comprises a control module for generating radio-frequency signals, a power module for generating energy, a magnetic compatibility display for conducting display in a magnetic resonance room, a mouse for operating magnetic compatibility and the individual multi-stage ablation needle of compatibility. With the application of the apparatus, by virtue of the mouse and the display, the ablation apparatus can be regulated and controlled by a doctor through a human-computer interaction interface, and magnetic resonance real-time imaging is implemented to judge an ablation process, so that an ablation effect is enhanced and patient's pain is reduced; alternating current is converted into direct current and is supplied; a control board is in charge of controlling output power, and primary filtering is conducted; by virtue of an amplifying plate, the radio-frequency signals are amplified into the radio-frequency energy applicable to ablation; by virtue of a display plate, ablation time, ablation temperature and ablation power are displayed; and the ablation needle is injected with physiological saline in an ablation process, so that an ablation area is improved.

The invention discloses a control method and device of a laser ablation system and a computer readable storage medium, and the method comprises the steps: obtaining a 3D profile diagram of a to-be-processed workpiece, and determining the workpiece information of the to-be-processed workpiece according to the 3D profile diagram, the workpiece information comprises the height and gradient corresponding to the salient point of the to-be-stripped curved surface and the corresponding target position of the salient point in the to-be-processed device; determining ablation power according to the height and the gradient; and performing ablation processing on the target position according to the ablation power. According to the invention, the ablation accuracy of the to-be-processed workpiece is improved.

The invention discloses a control method and device of a laser ablation system and a computer readable storage medium, and the method comprises the steps: obtaining a 3D profile diagram of a to-be-processed workpiece, and determining whether the to-be-processed workpiece has a to-be-stripped curved surface or not according to the 3D profile diagram; when the to-be-processed workpiece has the to-be-stripped deep curved surface, acquiring the height corresponding to the salient point of the to-be-stripped deep curved surface and the material information corresponding to the to-be-processed workpiece; determining the number of ablation times according to the height, and determining the ablation power corresponding to each ablation according to the material information; and controlling the laser ablation system to perform successive ablation on the curved surface to be deepened corresponding to the workpiece to be processed according to the ablation power. According to the invention, the laser ablation accuracy is improved.

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 present invention is entitled "Dynamic Ablation and Sensing Based on Contact of Segmented Electrodes." A system includes an expandable distal tip of a catheter and a processor. The expandable distal tip has a plurality of electrodes configured to be placed in contact with tissue in an organ and to apply ablative power to the tissue. The processor is configured to determine whether physical contact between the electrodes and the tissue meets a predefined contact quality during application of the ablation power, and if the physical contact between the electrodes and the tissue does not meet the predefined contact quality, reuse the electrodes for electrophysiological (EP) sensing.

The invention discloses a microwave ablation and carbonization component regulation and control method based on tissue temperature real-time feedback, which comprises the following steps: S1, analyzing the heat absorption rate of a tissue sample through differential scanning calorimetry to obtain a DSC heat absorption rate curve; s2, acquiring a temperature T1 corresponding to the maximum heat absorption rate according to the heat absorption rate curve, comparing T1 with a tissue carbonization temperature T2, and setting a proper upper limit temperature threshold T3 and a proper lower limit temperature threshold T4; s3, a microwave ablation and real-time temperature monitoring system is built, ablation power P and time t are set, and the temperature T at the energy radiation point of the ablation needle is obtained in real time; s4, if T is larger than or equal to T3, ablating is paused, the ablating time t1 is recorded, if T is smaller than or equal to T4, ablating continues, the ablating time t1 is recorded in an overlapped mode, and ablating is ended until t1 is equal to t. According to the invention, an ablation area is closer to a sphere and is closer to a treatment target pursued by a clinician.

The present invention is entitled "Ablation of low-medium depth lesions in ultrashort duration using ultra-high radiofrequency (RF) power." The present invention discloses a method for ablation of body tissue, the method comprising defining an ultra-high power ultra-short duration (UPUD) ablation protocol, the ultra-high power ultra-short duration (UPUD) ablation protocol specifying an ablation signal having (i) a target ablation power of at least 400 watts and (ii) a pulse duration of no more than three seconds for producing a specified ablation lesion in tissue within a patient's body. Contact is achieved between an ablation probe and the tissue. Using the ablation probe, an ablation signal is applied to the tissue according to the UPUD protocol, the UPUD protocol delivering the ablation signal having the specified target ablation power and duration.

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.

Various aspects of the present invention are directed towards apparatuses, systems, and methods that may include a tissue ablation system. The tissue ablation system may include a plurality of ablation devices, each ablation device being configured to provide ablation energy, at least one ablation generator configured to provide ablation power to at least one of the plurality of ablation devices, and a controller configured to cause each of the plurality of ablation devices to selectively receive ablation power and configured to cycle through activation of a plurality of ablation states.

A method and apparatus for controlling output of radio frequency ablation power, and a radio frequency ablation system. The method for controlling output of radio frequency ablation power comprises: when a starting signal is received, controlling a radio frequency energy generator to output a preset ablation power, recording ablation time, and acquiring an actual ablation parameter (102), wherein the actual ablation parameter comprises the 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 suspend output of the ablation power, recording sleep time, and suspending recording of the ablation time (105); and if the sleep time exceeds a sleep time threshold value, controlling the radio frequency energy generator again to continue to output the ablation power, and continuing to record the ablation time (107), wherein the first preset condition is: R>K1×Rmin1, and the second preset condition is: R>K2×Rmin2. According to the method, the impedance of an ablation part is enabled to be in an intermittent stably-changing state, and continuous output of radio frequency energy can be ensured, such that radio frequency ablation is relatively uniformly performed in a cyclic manner.

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 pulsed field ablation device and a pulsed field ablation control method. The pulsed field ablation device comprises a sleeve, and an impedance detection electrode is arranged at the top end of the sleeve; the deformation supporting body can extend out of the interior of the cannula through deformation and then is unfolded, and a plurality of pulse field ablation electrodes are arranged on the deformation supporting body; the pulse field ablation power supply is used for supplying power to the pulse field ablation electrode; the impedance detection module is used for recording the impedance of the impedance detection electrode; and the switch control module is used for controlling the on-off state of the pulse field ablation power supply according to the magnitude of the impedance detection signal.