28 results about "Tissue impedance" patented technology

The invention discloses a dynamic test method and system for tissue frequency domain impedance characteristics, and belongs to the technical field of medical detection. The system comprises an energy generator, a bipolar scalpel, a signal generator, a radio frequency power amplifier module, a control unit, two loop switches, a sampling probe and a test unit. An electrode of the bipolar scalpel is used for being in contact with a biological tissue to be subjected to frequency domain impedance characteristic testing; the energy generator is connected with the first loop switch and is used for outputting an electric resection / electrocoagulation signal to the biological tissue so as to dynamically reproduce the state change of the biological tissue; and the signal generator inputs a broadband excitation voltage signal to the biological tissue through the radio frequency power amplifier module and the second loop switch. The control unit is used for coordinating on-off of the two loop switches. The sampling probe is used for collecting voltage and current signals of the double electrodes in real time and feeding back the signals to the testing unit. The test unit generates a real-time impedance characteristic spectrogram of the biological tissue along with frequency change. The tissue impedance change can be monitored on line in real time.

Systems and methods for enhancing surgical outcomes by providing generators having optimal RF output for sealing, fusing and / or cutting tissue or vessels under all dynamic conditions are described. Examples of dynamic conditions may include varying tissue impedance load due to electrosurgical operations or tissue affects, any operational conditions and commands determined by the surgeon, surgical procedure and / or device script. This is achieved by implementing a digital closed-loop control system within the electrosurgical generator to regulate voltage, current, and power of the RF output. The digital closed-loop control system may include an RF amplifier for generating RF energy, a feedback system for constantly monitoring the electrical characteristics, e.g., voltage, current, and power, of the supplied RF energy to a connectable electrosurgical instrument and a microcontroller for processing measurement data from the feedback system and adjusting the output of the RF amplifier to meet a desired regulation target under any varying conditions.

The invention discloses an electrosurgical tissue impedance measurement system and method based on frequency domain analysis. The system comprises a main energy generation module, a modulation signal generation module, an output superposition module, a signal acquisition module, an impedance calculation module and a feedback control module. The main energy generation module outputs a high-frequency main waveform for tissue cutting or blood coagulation; the modulation signal generation module is used for generating a modulation signal, and the modulation signal comprises one of a multi-cosine signal or a multi-frequency sweep-frequency signal and a pseudo-random sequence; the output superposition module is used for superposing the modulation signal into the main waveform; the signal acquisition module synchronously acquires tissue voltage and current signals after the modulation signal is loaded; the impedance calculation module is used for performing frequency domain analysis on the voltage and current signals acquired by the signal acquisition module, extracting frequency components corresponding to modulation signals by using fast Fourier transform (FFT), phase lock detection (PLL) or a time-frequency analysis algorithm, and performing frequency domain analysis on multi-cosine signals or frequency sweep signals; by comparing the amplitude ratio and the phase difference of the corresponding frequency components of the modulation signal output end and the response end, the impedance Z = RZ < Z of the measured tissue is inverted according to the known reference impedance, and Z is the impedance of the measured tissue; rZ is the amplitude of the measured impedance and reflects the magnitude of the impedance; < Z represents the phase difference between the voltage and the current; for a pseudo-random sequence signal, a matched filter is used for carrying out related detection on an input signal, and a pseudo-random sequence value is extracted so as to obtain a system signal and control data; a feedback control module adjusts the output power or the cutting / coagulation mode of the electrosurgical equipment in real time according to the tissue impedance obtained through calculation and the dynamic change of the tissue impedance; wherein the dynamic change is a group of dynamic sequence values of the impedance of the measured tissue from the time dimension. By means of the design, real-time accurate measurement can be achieved, the anti-interference capability is high, errors are small, and efficient and safe cutting / blood coagulation can be achieved.

A system includes an energy-based surgical instrument having an end effector with two electrodes. One of the electrodes has multiple electrode portions. A generator coupled to the surgical instrument supplies radio frequency (RF) energy to the electrode portions for a tissue coagulation process, and further supplies RF energy at a higher voltage or current to the other electrode portion for a tissue transection process. Control elements monitor tissue impedance or tissue temperature. Other embodiments are described and claimed in this invention.

The embodiment of the invention discloses a high-frequency electrotome control device and a high-frequency electrotome control system. A specific embodiment of the device comprises a control unit configured to control a high-frequency power generator to output high-frequency electric energy; the data acquisition unit is configured to perform multi-dimensional data acquisition on human tissues; the signal acquisition unit is configured to perform signal acquisition on sound waves and perform feature extraction on sound wave signals; the feature extraction unit is configured to perform feature extraction on the tissue impedance information sequence and the human tissue image sequence; the feature fusion unit is configured to perform feature fusion on the acoustic wave feature tensor, the tissue impedance feature tensor and the human tissue feature tensor; the generation unit is configured to generate a high-frequency electrotome control instruction; and the adjusting unit is configured to adjust the output power and perform waveform modulation on the high-frequency electric energy. According to the implementation mode, excessive heat injury in the operation process can be reduced or the cutting and blood coagulation efficiency can be improved.

The present application relates to the technical field of ultrasonic knife equipment, and discloses a multifunctional ultrasonic dissecting knife, which comprises a piezoelectric transducer, a variable amplitude rod, a frequency generating module, a working head, a detection part and a control part, and further comprises: the detection part is configured to obtain tissue information of a region to be dissected, wherein the tissue information comprises tissue load information and tissue impedance information; the control part is electrically connected with the detection part, the variable amplitude rod, the frequency generating module and the piezoelectric transducer respectively, and is configured to determine a preset output amplitude of the variable amplitude rod according to the tissue information, and determine an electric signal frequency of the frequency generating module according to the output amplitude. By acquiring the tissue load and impedance information in real time, the output amplitude of the variable amplitude rod and the electric signal frequency of the frequency generating module are intelligently adjusted, the dynamic adaptability and precise control of the energy output of the ultrasonic dissecting knife are realized, and the operation efficiency and safety are improved.

The invention provides an electrical stimulation equipment output parameter adaptive adjustment method based on biofeedback, and the method comprises the steps: collecting a baseline interference response signal of a calibration stimulation pulse after the attachment of an electrode assembly is completed, and extracting the amplitude, rising edge slope, decay time, waveform distortion and other reference interference response characteristics. Interference response signals corresponding to the treatment stimulation pulses are collected in real time in the treatment process, and treatment process interference response characteristics corresponding to the reference characteristics are calculated. By comparing the deviation degree of the interference response characteristic and the reference characteristic in the treatment process, the current electrode contact state is dynamically evaluated, the corresponding local tissue impedance state is deduced, and grading recognition of the states such as good contact, general contact and abnormal contact is achieved. On the basis, according to the electrode contact state and the tissue impedance state, the safety upper limits of output parameters of the stimulation current, the stimulation voltage, the pulse conduction time and the waveform rise time are calculated in a self-adaptive mode.

This invention relates to the field of neuroelectric stimulation technology, specifically a method and system for current regulation during neuroelectric stimulation. The method identifies the target nerve location and depth based on tissue impedance distribution data and patient characteristic parameters, using a deep neural network model to obtain a recommended initial stimulation current value and a personalized target amplitude. It acquires the deviation between the evoked potential amplitude and the personalized target amplitude, and analyzes this deviation with waveform characteristic parameters to obtain a first current regulation step value to adjust the coarse stimulation current until the evoked potential amplitude exceeds the personalized target amplitude. At this point, the current coarse stimulation current value is recorded as the optimized stimulation current value, and a comprehensive quality score is obtained. Based on the comprehensive quality score, a second current regulation step value is dynamically calculated to adjust the fine-tuned stimulation current value. When the comprehensive quality score exceeds a preset quality score threshold, the final stimulation current value is obtained. This effectively improves the accuracy of current regulation during neuroelectric stimulation for different patients.

A surgical system includes electrodes configured to deliver radiofrequency energy to tissue, and a processor configured to control delivery of the RF energy with increasing power, monitor tissue impedance, calculate tissue impedance slope, compare the tissue impedance to a predetermined impedance threshold, and compare the tissue impedance slope to a predetermined impedance slope threshold. The processor is configured to, in response to determining that the tissue impedance is not greater than the predetermined impedance threshold or that the tissue impedance slope is not greater than the predetermined impedance slope threshold, control the delivery of the RF energy to continue with increasing power. The processor is also configured to, in response to determining that the tissue impedance is greater than the predetermined impedance threshold and that the tissue impedance slope is greater than the predetermined impedance slope threshold, control the delivery of the RF energy with a predetermined constant voltage.

This invention relates to the field of medical device technology, specifically to an intelligent energy control method and system for an electrosurgical energy platform. The method includes: real-time acquisition of multi-dimensional electrophysiological parameters at the tissue-electrode contact point during electrosurgical procedures, including tissue impedance, voltage, current, and phase difference; inputting the acquired multi-dimensional electrophysiological parameters into a pre-trained tissue type recognition model to identify the currently contacting tissue type and determine its corresponding energy safety threshold; dynamically calculating the optimal energy output parameters based on the identified tissue type and surgical operation mode; and real-time monitoring of tissue state changes, automatically adjusting energy output or triggering a safety protection mechanism when the tissue state reaches a preset critical value. This invention achieves adaptive intelligent control of the electrosurgical energy platform through a combination of multi-parameter fusion sensing and artificial intelligence algorithms, improving surgical safety and accuracy, reducing tissue thermal damage, and lowering the risk of surgical complications.

The invention provides a tissue coagulation state judgment method and system for a high-frequency electrotome, and relates to the technical field of high-frequency electrotomes. The method comprises the following steps: initializing operation parameters; voltage and current between two electrodes of the high-frequency electrotome are collected in real time, real-time impedance of tissue between the two electrodes is calculated, and an impedance sequence in the latest period of time is formed; performing a Mangkendall trend test on the impedance sequence to obtain a standardized statistical magnitude; and judging the change trend of tissue impedance based on the standardized statistics, and determining the tissue coagulation state according to the change trend. According to the method disclosed by the invention, the Mangkendall trend test based on data statistics is adopted, so that the decreasing and increasing trends of tissue impedance and the significance degree of the trends can be effectively judged, and the accuracy and the reliability of judging the tissue coagulation state are improved.

A system includes an energy-based surgical instrument with an end effector having two electrodes. One of the electrodes has multiple electrode portions. A generator coupled to the surgical instrument supplies radio-frequency (RF) energy to an electrode portion for a tissue coagulation process and further supplies RF energy at a higher voltage or current to another electrode portion for a tissue transection process. A control element may monitor tissue impedance or tissue temperature. Other embodiments are described and claimed.

The application discloses a high-frequency electrotome safety system with real-time monitoring function and a control method, relates to the technical field of medical equipment, and comprises: a monitoring unit which collects electrotome output power, current voltage, electrode temperature, tissue impedance and a surgical area image, and the collection frequency is dynamically adjusted according to the surgical stage; a control unit which analyzes multidimensional data, outputs adjustment, early warning and emergency instructions, and coordinates module operation; a power adjustment unit which dynamically adjusts power and adapts to surgical and tissue characteristics; a safety early warning unit which triggers protection through graded early warning; a man-machine interaction unit which displays parameters and supports manual operation; a data storage unit which encrypts and stores data and supports traceability; and a communication unit which transmits data in multiple modes to realize information synchronization. The application realizes real-time monitoring of multiple parameters of the high-frequency electrotome, avoids surgical risks through graded early warning, supports remote monitoring through multiple mode communication, is convenient to operate and adapts to clinical needs, and greatly improves surgical safety and standardization.

A surgical system includes electrodes configured to deliver radiofrequency energy to tissue, and a processor configured to control delivery of the RF energy with increasing power, monitor tissue impedance, calculate tissue impedance slope, compare the tissue impedance to a predetermined impedance threshold, and compare the tissue impedance slope to a predetermined impedance slope threshold. The processor is configured to, in response to determining that the tissue impedance is not greater than the predetermined impedance threshold or that the tissue impedance slope is not greater than the predetermined impedance slope threshold, control the delivery of the RF energy to continue with increasing power. The processor is also configured to, in response to determining that the tissue impedance is greater than the predetermined impedance threshold and that the tissue impedance slope is greater than the predetermined impedance slope threshold, control the delivery of the RF energy with a predetermined constant voltage.

Systems and methods for enhancing surgical outcomes by providing generators having optimal RF output for sealing, fusing and / or cutting tissue or vessels under all dynamic conditions are described. Examples of dynamic conditions may include varying tissue impedance load due to electrosurgical operations or tissue affects, any operational conditions and commands determined by the surgeon, surgical procedure and / or device script. This is achieved by implementing a digital closed-loop control system within the electrosurgical generator to regulate voltage, current, and power of the RF output. The digital closed-loop control system may include an RF amplifier for generating RF energy, a feedback system for constantly monitoring the electrical characteristics, e.g., voltage, current, and power, of the supplied RF energy to a connectable electrosurgical instrument and a microcontroller for processing measurement data from the feedback system and adjusting the output of the RF amplifier to meet a desired regulation target under any varying conditions.

This invention discloses a handheld integrated single-needle jet coagulation device and a safe current control method. The device highly integrates a lithium battery, AC power module, current limiting module, and single-needle jet arc electrode unit into a handheld shell. It can be connected to different working gases and has the advantages of small size, portability, and adaptability to multiple coagulation scenarios. This invention adopts a single-needle jet arc self-selection path mechanism, which autonomously selects the discharge path with the lowest tissue impedance, solves the problem of random current diffusion in multi-electrode systems, avoids local overcurrent burns, and improves coagulation uniformity and operational safety. At the same time, a coagulation impedance-current value mapping model is established to reveal the exponential decay law of coagulation impedance and arc current, achieving accurate current characterization. A dual-threshold reverse control mechanism is proposed, which uses the human body safe current and biomedical effect dual threshold constraints to reverse derive the impedance safety window and quantify the power supply current limiting parameters, thereby improving the coagulation effect while ensuring safety.

This disclosure presents embodiments of a high-frequency electrosurgical unit control device and control system. One specific embodiment of the device includes: a control unit configured to control a high-frequency power generator to output high-frequency electrical energy; a data acquisition unit configured to perform multi-dimensional data acquisition of human tissue; a signal acquisition unit configured to acquire sound waves and extract features from the sound wave signals; a feature extraction unit configured to extract features from tissue impedance information sequences and human tissue image sequences respectively; a feature fusion unit configured to fuse sound wave feature tensors, tissue impedance feature tensors, and human tissue feature tensors; a generation unit configured to generate high-frequency electrosurgical unit control commands; and an adjustment unit configured to adjust the output power and modulate the waveform of the high-frequency electrical energy. This embodiment can reduce excessive thermal damage during surgery or improve cutting and coagulation efficiency.

The utility model belongs to the field of high frequency electrotome control, concretely relates to a handheld bipolar automatic coagulation device, the utility model discloses a handheld bipolar automatic coagulation device utilizes the power module to power supply for the device, is suitable for the convenient use environment of outside. Utilize the tissue control detection module to collect the analog voltage and current signal of target tissue between the clamp in real time and feed back to the controller, the controller generates the tissue impedance state parameter according to the analog voltage and current signal of target tissue of tissue control detection module feedback, and adjusts the PWM duty ratio of PWM driver based on tissue impedance state parameter, and PWM driver controls the output voltage of transformer to clamp through driving MOS tube. The device can automatically judge whether the working power is outputted, and the power required by the coagulation tissue is automatically adjusted in the coagulation process, and the equipment automatically inducts the size of tissue resistance and outputs real-time power, so that the handheld bipolar electrocoagulation can play a more simple and efficient role in various complex treatment scenes.

A system can include excitation pads that can apply an excitation signal to tissue of a patient. The excitation pads can be connected to an electronic circuit that communicates the excitation signal to the excitation pads. The system can include a measurement sensor that can measure voltage of the tissue. The system can include a controller that can determine impedance of the tissue. The controller can be in communication with the excitation pads, the electronic circuit, and the measurement sensor. The controller can generate the excitation signal. The controller can obtain a current measurement of the excitation signal after it has been communicated through at least a portion of the electronic circuit. The current measurement can correspond to the excitation signal before it is applied to the tissue. The controller can determine impedance of the tissue based on the voltage measurement and the current measurement of the excitation signal.

Disclosed is a system for evaluating brain trauma via regional changes in tissue impedance. The present disclosure describes a system for non-invasive intracranial monitoring, comprising two or more affecting electrodes arranged between a conductive location of a cranium of a patient and a location on a scalp of the patient, two or more effected electrodes arranged between the conductive location of the cranium of the patient and the location on the scalp of the patient, and processing circuitry configured to apply an electrical stimulus between the two or more affecting electrodes, measure an electrical stimulus differential between the two or more effected electrodes, calculate, for the two or more effected electrodes, a value of an impedance metric, and identify, based on the calculated value of the impedance metric, a health condition of the patient.

A system includes an energy-based surgical instrument with an end effector having two electrodes. One of the electrodes has multiple electrode portions. A generator coupled to the surgical instrument supplies radio-frequency (RF) energy to an electrode portion for a tissue coagulation process and further supplies RF energy at a higher voltage or current to another electrode portion for a tissue transection process. A control element may monitor tissue impedance or tissue temperature. Other embodiments are described and claimed.

An electrosurgical generator and associated methods determine a real part of the impedance of treated tissue. The electrosurgical generator includes an output stage, a plurality of sensors, and a controller that controls the output stage. The controller includes a signal processor that determines an RMS voltage, an RMS current, an average power, and a real part of the impedance of the treated tissue based on measured voltage and current by using a plurality of averaging filters. The controller controls the output stage to generate electrosurgical energy based on at least the determined real part of the impedance.

The invention provides a hemostasis cutting instrument capable of modulating power density based on contact area difference, which comprises a gun-shaped handle, an instrument rod mounted on the gun-shaped handle and an electrosurgical tool bit mounted at the far end of the instrument rod, the electrosurgical tool bit is of a pincerlike structure and consists of an upper jaw and a lower jaw which can be mutually opened and closed, and the upper jaw is connected with the lower jaw. A conductive structure A is fixedly installed on the inner side of the upper jaw, the conductive structure A is matched with a conductive structure B fixedly installed on the inner side of the lower jaw, a conductive structure C is arranged at the adjacent position or the center position of the conductive structure A, and an insulation structure is fixed between the conductive structure C and the conductive structure A. Under the condition of not depending on an external negative plate and not arranging a mechanical cutting blade, continuous or alternate treatment of blood coagulation and cutting at the tail end of the same instrument is achieved, energy output can be scheduled in combination with the tissue impedance change trend, and the device has the advantages of being high in safety, simplified in structure and high in operation efficiency.

A method and pulsed field ablation (PFA) system configured to provide variable impedance paths for delivery of electric fields to patient tissue using a PFA catheter are disclosed. According to one aspect, a method includes determining a current for each of a plurality of circuit paths, each circuit path including two electrodes. Each current may be determined based at least in part on: a desired voltage between the two electrodes; a tissue impedance between the two electrodes; and a parasitic impedance associated with the circuit path. The method also includes determining at least one of an excitation voltage and an input resistance for each circuit path of the plurality of circuit paths based at least in part on the determined current for the circuit path, parasitic impedances associated with the circuit path and a tissue impedance between the two electrodes in the circuit path.

A radiofrequency tissue ablation system is configured to reduce occurrences of impedance-related stoppages of radiofrequency energy delivery during a radiofrequency tissue ablation procedure. The system includes a radiofrequency generator and one or more processors operatively coupled to the power source and to the one or more temperature sensors. The processor is configured to cause the power source to deliver radiofrequency energy to the electrodes to provide controlled heating of tissue and receive a plurality of temperature measurements from the temperature sensors, calculate a magnitude and a rate of change of tissue impedance based on signals received from the one or more electrodes and determine whether one or more trigger criteria are met. If the one or more trigger criteria are met, the processor causes the power source to temporarily reduce power output to reduce temperature to a lower threshold temperature and to ramp power output.

An impedance-monitoring method, applied to an electrical-stimulation device and a lead, is provided. The electrical-stimulation device stores a first impedance value of the electrical-stimulation device and a second impedance value of the lead. The method includes the following steps: utilizing the electrical-stimulation device to generate an electrical-stimulation signal, and to perform electrical stimulation on a target area using the electrical-stimulation signal; utilizing the electrical-stimulation device to sample the electrical-stimulation signal to calculate a total impedance value corresponding to the electrical-stimulation signal; and utilizing the electrical-stimulation device to calculate a tissue-impedance value according to the total impedance value, the first impedance value of the electrical-stimulation device, and the second impedance value of the lead. The tissue-impedance value is used to calculate the energy value of the electrical-stimulation signal transmitted to the target area.