CN100457059C - Multi-path radio-frequency smelting therapic equipment - Google Patents

Abstract

A multi-channel RF therapeutic apparatus for continuously eliminating multiple targets in a ring region of venae pulmonales is composed of an amplifier for generating power signals, a microcontroller consisting of central controller and parameter measuring controller, a parameter detector, a display and operation controller, a power switching switch for optical relay, and multiple eliminating electrodes with isolator.

Description

Multi-channel radiofrequency ablation therapy instrument

Technical field

The invention belongs to the electronic therapeutic apparatus in the technical field of biomedical engineering, in particular to a multi-channel radio frequency ablation therapeutic apparatus.

Background technique

With the development of biomedical engineering, cardiac radiofrequency ablation has been more and more widely used in clinical practice. The stability and accuracy of radiofrequency ablation therapy instruments have also been continuously improved. Chinese patent CN254397Y "Temperature-controlled radiofrequency ablation therapy apparatus" provides a radiofrequency ablation therapy apparatus with improved voltage, current and power accuracy and higher integration. However, it has been found in clinical practice in the treatment of atrial fibrillation in recent years that a ring-shaped area of the pulmonary vein needs to be ablated. If the existing single-channel radiofrequency ablation treatment apparatus is used, not only the operation time is long, but also it is difficult to ensure complete and continuous ablation of the annular region. Therefore, there is a need for a multi-channel radiofrequency ablation therapeutic apparatus capable of continuous ablation, more accurate load detection, and higher safety performance.

Contents of the invention

The purpose of the present invention is to provide a multi-channel radiofrequency ablation treatment apparatus, which can determine the number of electrodes used according to the needs of the operation process, perform continuous ablation, and shorten the operation time. The power signal and control parameters of each electrode are isolated and then contacted with the patient to improve the safety of the instrument. According to the requirements of the treatment, the impedance value can be detected more accurately in real time and the power and temperature of each electrode can be accurately determined, so as to improve the therapeutic effect of the operation and reduce the risk of the operation.

The object of the present invention is achieved in this way: a multi-channel radio frequency ablation therapeutic apparatus is composed of radio frequency power signal generation amplifier, microcontroller, parameter detector and display operation controller. A power switching switch is set between the power signal generating amplifier and the externally connected ablation electrodes, and a plurality of ablation electrode connection interfaces are set on the output end of the power switching switch. The micro-controller refers to the central controller micro-controller 1 and the parameter detection controller micro-controller 2 , and the input end of the power switching switch is also connected to the micro-controller 2 . Between the power signal generating amplifier and the power switcher, and between the microcontroller 1 and the microcontroller 2, isolators are provided respectively.

The power switch is a photorelay. The isolator between the power signal generating amplifier and the power switching switch is a transformer. The isolator between microcontroller 1 and microcontroller 2 is a fiber optic isolator. The parameter detection refers to the detection of voltage, current, temperature and impedance under the control of microcontroller 2 . The detection of impedance refers to collecting impedance signals for each electrode respectively, and outputting detection signals after filtering and amplifying.

The impedance detection refers to the collection and detection of electrical signals of each electrode at a fixed frequency and in different time periods. The impedance detection refers to the collection and detection of electrical signals of different frequencies of each electrode in any time period.

That is to say, the impedance detection described above can be completed in two ways, one is a time distribution method, and the other is a frequency distribution method. The impedance detection of the time distribution method means that the impedance detection signal of each electrode adopts the same frequency and works in different time periods, and each electrode only detects the signal of the corresponding time period, thereby completing the impedance detection. The impedance detection of the frequency distribution method means that the impedance detection signals of each electrode use different frequencies, and each electrode only detects the signal of the corresponding frequency, so as to complete the impedance detection. The purpose of frequency allocation and time allocation is to reduce signal interference and radio frequency interference between electrodes, accurately collect signals, and accurately detect impedance. Impedance detection can be performed when the radio frequency is output and when the radio frequency is not output, so as to realize the whole process of impedance detection.

The present invention has the following advantages:

1. Multi-channel electrode ablation has the unique advantage of continuous ablation of multiple targets in circular or patchy areas, which greatly improves the success rate of the operation and shortens the operation time.

2. Due to the use of an effective isolator, the power signal is amplified and isolated by the transformer, and then output to the electrode and then to the patient. The control and parameter signals are isolated by optical fiber through photoelectric conversion and then to the electrode and then to the patient. The safety performance is greatly improved.

3. The impedance of each electrode is detected more accurately in real time throughout the whole process, the accuracy of the therapeutic instrument is greatly improved, and the risk of surgery is greatly reduced.

4. Multi-channel electrode ablation not only has the unique advantage of simultaneous ablation of multiple targets in the pulmonary vein ring area required for cardiac treatment, but also has good effects on interventional ablation of the liver, nerves, intestines and stomach, and five sense organs.

Description of drawings

Fig. 1 is a structural block diagram of the multi-channel radiofrequency ablation apparatus.

Figure 2 shows the use of optical MOS relays as power switching switches.

Fig. 3 is a block diagram of collecting and detecting impedance signals of each electrode.

Fig. 4 is a circuit diagram of impedance signal acquisition and detection.

Fig. 5 is a schematic diagram of a time relationship between the impedance detection signal and the power signal of each electrode in the case of impedance detection in the time distribution mode.

Figure 6 is a schematic diagram using an opto-isolator.

Detailed ways

See attached picture.

Example 1

The multi-channel radio frequency ablation therapeutic apparatus is composed of radio frequency power signal generating amplifier, microcontroller, parameter detection, display, operation control, power switcher and isolator. The multichannel ablation electrodes are connected to the interface of the output end of the power switcher. The microcontroller refers to the central controller microcontroller 1 and the parameter detection controller microcontroller 2 , and the input end of the power switcher is also connected to the microcontroller 2 . The transformer is used as the isolator between the power signal generation amplification and the power switcher, and the optical fiber is used as the isolator for the isolation between microcontroller 1 and microcontroller 2. After isolation, each electrode contacts the patient again, and its safety performance Further improve.

The power distribution of multi-channel electrodes is done by power switching switches. There are n electrodes corresponding to n power switching switches, and the power switching switches corresponding to each electrode can quickly distribute power to each electrode. After passing through the isolator, the power signal output by the power signal generation amplifier is controlled by the control signal generated by the microcontroller 2. According to the control signal, the power signal is switched to each electrode through the optical MOS relay. Since the signal to be switched is a high-power radio frequency signal, at 100K-1MHz, above 100W, and the switching speed is required to be very fast, t<10ms, the power switching switch in this example uses an AQZ264 optical MOS relay.

Another outstanding advantage of the present invention is that the impedance of each electrode is accurately detected in real time throughout the whole process. Different from other radio frequency ablation instruments, this radio frequency ablation instrument specially collects the impedance signal of each electrode itself, and the detection of impedance is controlled by the microcontroller 2 . The microcontroller 2 controls the signal generator in the parameter detector to generate several detection signals and input them to each electrode, and then collects impedance signals. The real-time voltage and current signals of each electrode are collected as the input of the impedance signal, detected and displayed, regardless of whether the radio frequency output or not, the acquisition and detection of the impedance signal can be carried out, thus realizing the real-time detection of the whole process. Compared with the existing ablation apparatus, the detection accuracy of the ablation therapy apparatus is greatly improved. In this embodiment, the impedance signal is collected and detected from the electrical signals of each electrode in different time periods, that is, the impedance signal is collected and detected in a time-allocated manner. Each electrode uses the same fixed frequency, which is selected according to the needs within 10-100KHz. It is known from Figure 3 that after each electrode obtains the voltage and current signals, the output is converted into the required impedance signal after filtering and amplifying. Figure 4 shows the circuit diagram of impedance detection. The collected signal is filtered by R1, C2, R2, C3 and L1, and then sent to the amplifying circuit composed of R3, C4, R4 and U1 to output the amplified impedance signal. The amplifier U1 adopts LF357.

Example 2

The detection of the impedance is still controlled by the microcontroller 2, and the difference from Embodiment 1 is that the acquisition of the impedance signal is carried out in a frequency distribution manner. Each electrode is assigned a fixed frequency, which is selected according to the needs within 10-100KHz, which are different. Each electrode collects the selected signal in a specific frequency band, and only detects the signal of the corresponding frequency. After the acquisition, the circuit shown in Figure 4 still completes the output of the impedance signal.

The purpose of using frequency allocation or time allocation to detect impedance is to reduce the interference of signals between electrodes, accurately collect signals, and accurately detect impedance.

Claims (1)

1 one kinds of multi-path radio-frequency smelting therapic equipments produce amplifier by rf power signal, microcontroller, and parametric detector and demonstration, operation control etc. are partly formed, and it is characterized in that: the impedance detection in the described parametric detector adopts one of following dual mode:

1), to the collection and the detection of the signal of telecommunication of the different time sections of the fixed frequency of each electrode;

2), to the collection and the detection of the signal of telecommunication of the random time section of the different frequency of each electrode.

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