47 results about "Tissue impedance" patented technology

The invention discloses an intelligent management system and method applied to a radio frequency energy output device, and belongs to the technical field of intelligent management of the radio frequency energy output device.An integrated sensor array is deployed on a radio frequency host and a hand tool electrode, and load voltage, output current, electrode temperature and tissue impedance are synchronously collected; a dynamic thermal impedance collaborative analysis model is constructed after time synchronization alignment, a three-dimensional thermal field simulation map is generated, and a thermal accumulation trend is predicted; a double-layer control framework is constructed, a first control layer generates a dynamic power adjustment rule base based on a preset treatment target and a safety threshold value and outputs an instruction, a second control layer receives the instruction and adjusts output parameters in real time, and a strategy is adjusted by combining a model prediction result in the execution process; meanwhile, the operation state is continuously monitored, a fault classification model is constructed for anomaly detection, a fault source is positioned, and a visual report is generated; and finally, constructing a mapping relation based on historical data, and generating an energy control scheme adapted to individualized requirements through iterative optimization.

The invention discloses a radio frequency ablation electrode control method which comprises the following steps: S1, initializing an ablation temperature target value, a safety limit value and a power adjusting range, and loading a pre-stored anal fistula ablation three-stage feature library and impedance-temperature correlation degree thresholds of all stages; s2, collecting the electrode temperature, the electrode-tissue impedance and the ablation duration in real time, and judging the current ablation stage according to the matching relationship between the ablation duration and the three-stage feature library; s3, formulating a state judgment rule according to the current stage; s4, a fuzzy PID algorithm is adopted to calculate a power basic adjusting amount, a power dynamic compensation amount is calculated, and final output power is determined; and S5, repeating the steps S2-S4 to realize closed-loop control, triggering first-level early warning when the parameters are close to the boundary, triggering second-level alarm when the parameters exceed the safety limit value, and recording abnormal data. The stage adaptability is high, the problem of temperature adjustment lag can be solved, the adjustment precision is accurate enough, and the ablation effect can be improved.

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.

The invention discloses a double-rod current phase difference energy control method and system, and relates to the technical field of electrosurgery, and the method comprises the steps: collecting a tissue impedance signal in real time, carrying out the anti-interference processing of an improved conditioning circuit, and calculating the impedance change rate. And when the change rate exceeds a threshold value, acquiring basic information of the suborgan tissues to carry out phase difference matching so as to obtain an optimal phase difference, and abandoning a single fixed phase difference output mode in the prior art. The phase difference is dynamically adjusted according to the tissue impedance signals collected in real time and the basic information of the suborgan tissue, complex changes of tissue characteristics are accurately adapted, and the problem that phase difference decision-making precision is insufficient is effectively solved. Meanwhile, the thermal injury risk can be remarkably reduced through accurate phase difference control, the operation safety is improved, the operation efficiency is optimized, and more reliable technical support is provided for clinical operation.

An ultrasonic surgical instrument and method for identifying tissue state and energizing the surgical instrument includes an end effector having an ultrasonic blade and an RF electrode, a shaft assembly, a body, and a power controller. A first ultrasonic energy input is configured to be actuated from a first unactuated energy input state to a first actuated energy input state. A trigger input is configured to be actuated from an unactuated trigger input state to an actuated trigger input state. The power controller is operatively connected to the ultrasonic blade, the RF electrode, the first ultrasonic energy input, and the trigger input and configured to direct at least one of the ultrasonic blade or the RF electrode to be selectively driven according to a predetermined drive function based on the tissue impedance, the state of the first energy input, and the state of the trigger input.

The application discloses an intelligent electronic otoscope control system and method based on electrical impedance detection, which contains an ear canal impedance signal collection unit, a weak signal conditioning unit, a multi-modal data processing unit, an intelligent analysis and decision unit, a man-machine interaction presentation unit and a closed-loop automatic control unit. A low-power multi-frequency impedance sensor array collects ear canal tissue impedance data at different frequencies, which is processed by the weak signal conditioning unit. The multi-modal data processing unit, combined with an edge computing gateway, completes analog-to-digital conversion and preliminary fusion. The intelligent analysis and decision unit uses an optimized impedance detection algorithm and a multi-dimensional heterogeneous data analysis model to deeply analyze the data, judges the ear health condition, and visualizes the results through the man-machine interaction presentation unit. The closed-loop automatic control unit realizes automatic adjustment of the detection process. The system and method can accurately detect ear health and improve the efficiency and accuracy of ear disease diagnosis.

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 invention discloses a dual-mode ablation treatment system based on tissue characteristic automatic matching, and the system comprises a power conversion circuit which is used for converting a 220V AC commercial power into a DC power required by the system and meeting the EMC standard; the system control circuit is used for scheduling each module to work, receiving a processing instruction and controlling a machine to respond; the parameter display circuit is used for displaying system parameters and states; the system has the advantages that radiofrequency ablation and microwave ablation technologies are innovatively integrated, tissue impedance signals are collected in real time through the impedance detection circuit, the focus characteristics are automatically judged through the system control circuit, and when impedance is small, the system is automatically switched to a microwave ablation mode; when the impedance is too large, the radio frequency ablation mode is automatically switched to; manual equipment replacement or manual mode switching is not needed, the problem that independent equipment is low in treatment efficiency is solved, and incomplete ablation or normal tissue damage caused by manual judgment deviation is avoided.

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.

The invention provides a voltage-controlled current source electrical stimulation circuit based on a standard 5V process, and the circuit is characterized in that the circuit comprises a voltage-controlled current conversion module, a stacked transistor output and control module, and a charge pump boost circuit module. The circuit works under external 5V power supply, adopts a standard 5V process, and can drive a wide-range load from 1k omega to 5k omega and output a wide-range adjustable current from 50mu A to 2mA. The circuit has the remarkable advantages that the circuit structure is simple, a special high-voltage process or an external high-voltage assembly is not needed, the manufacturing cost and the design complexity are reduced, and high integration and miniaturization are easy to realize. The wide load range characteristic of the circuit can stably drive common dynamic change tissue impedance in bioelectrical stimulation; the wide current output characteristic can adapt to various stimulation intensity schemes. Due to the characteristics, the device is highly matched with electrical stimulation application, and an effective technical approach is provided for developing low-cost and high-performance portable electrical stimulation medical equipment.

The invention discloses an electrotome system and a control method thereof, and belongs to the technical field of medical instruments. The invention aims to solve the problems of slow response and poor precision when an existing electrotome controls energy by adjusting voltage. A first aspect of the present invention provides an electrotome system whose control unit is configured to: calculate tissue impedance () and rate of change thereof; when the rate of change exceeds a predetermined predicted intervention slope, the pulse frequency is predictively adjusted to a safe cooling frequency to actively prevent tissue carbonization before the tissue reaches a carbonization impedance threshold. The second aspect of the invention provides an electrotome system, and the control unit of the electrotome system is configured to adjust the pulse frequency according to a preset lookup table storing the corresponding relation between tissue impedance and target pulse frequency. Energy is controlled by dynamically adjusting the pulse frequency (not voltage), the response speed is high, control is accurate, and the safety, efficiency and accuracy of an operation are remarkably improved through a predictive algorithm or a lookup table scheme.

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.

A method includes: transmitting a first set of radio-frequency (RF) pulses to an implantable wireless stimulator device such that electric currents are created from the first set of RF pulses and flown through a calibrated internal load on the implantable wireless stimulator device; in response to the electric currents flown through a calibrated internal load, recording a first set of RF reflection measurements; transmitting a second set of radio-frequency (RF) pulses to the implantable wireless stimulator device such that stimulation currents are created from the second set of RF pulses and flown through an electrode of the implantable wireless stimulator device to tissue surrounding the electrode; in response to the stimulation currents flown through the electrode to the surrounding tissue, recording a second set of RF reflection measurements; and characterizing an electrode-tissue impedance by comparing the second set of RF reflection measurements with the first set of RF reflections measurements.

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.

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 system for modulating delivery of radiofrequency (RF) power to tissue, the system including an RF applicator configured for being positioned adjacent to tissue, an RF generator electrically coupled to the RF applicator, and a controller operatively coupled to the RF generator. The controller includes a tissue impedance measurement circuit operatively coupled with the RF applicator and configured for measuring an impedance of tissue disposed adjacent to the RF applicator, and a power modulation module configured to cause RF power to be delivered from the RF generator to the tissue disposed adjacent to the RF applicator so that an impedance of the tissue tracks a target tissue impedance as a function of time.

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.

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.

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 provides an electrical stimulation targeted drug delivery and closed-loop control method for sepsis immune regulation and control, and belongs to the technical field of automatic control systems.The electrical stimulation targeted drug delivery and closed-loop control method comprises the steps that immune index data of a patient is monitored in real time, abnormal analysis is conducted on the immune index data, and an inflammation unbalance coefficient is determined; outputting a corresponding electrical stimulation signal according to the inflammation imbalance coefficient; a micro-needle array sensor is adopted to detect local tissue impedance of a drug targeted delivery area, and the optimal administration dosage and administration frequency are generated; based on the optimal administration dosage and the administration frequency, controlling an electric control micropump to execute targeted administration, collecting real-time immune feedback data after administration, calculating an immune adjustment error, and adaptively adjusting electrical stimulation parameters to form closed-loop control; and repeating the above steps until the inflammation imbalance coefficient and the real-time immune feedback data reach a dynamic termination condition, and executing a regulation and control termination program to complete sepsis immune regulation and control. The regulation and control efficiency and safety of sepsis immune imbalance are obviously improved.

The invention relates to the technical field of fistulization devices, in particular to an ileum fistulization device with a stoma monitoring function, which comprises a fixed chassis, a covering assembly and a monitoring assembly. The monitoring assembly comprises a fixing ring; an electrode plate and a photoelectric sensor are arranged at the bottom of the fixing ring; an electric control assembly is arranged on the fixing ring and electrically connected with the electrode plates and the photoelectric sensor through wires. According to the invention, leakage monitoring and ischemia early warning functions are integrated, tissue impedance can be measured through the electrode slice, and leakage can be accurately identified. Meanwhile, the photoelectric sensor is used for monitoring the blood oxygen saturation degree, the oppression ischemia condition can be found in time, and stoma tissue necrosis is prevented. According to the invention, seepage and ischemia states can be monitored in advance according to monitoring data, and the problem that detection and alarm can only be carried out after certain serious consequences are generated by a transmission monitoring device is avoided. The skin injury and infection risk caused by leakage or ischemia of a patient can be remarkably reduced, and the use comfort and life quality of the patient are improved.