Electric system for oncosurgery

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment and can be used in surgery for dissection and coagulation of soft tissues of organism. Electric system for oncosurgery contains control unit, connected through unit of electrosurgical action with active electrode, current metres, through them with passive electrodes and with current ratio calculator and comparator, with connected to it constant memory unit. In addition system contains connected with each other multi-frequency impedance metre, differentiator, tact generator and decoupler. Multi-frequency impedance metre is connected with its one inlet/outlet through decoupler with active electrode, second outlet of multi-frequency impedance metre is connected through differentiator to comparator. To comparator outlet unit of electrosurgical action is connected; tact generator is connected to inlet of multi-frequency impedance metre, to inlet of decoupler, to comparator and to outlet of unit of electrosurgical action.

EFFECT: possibility to constantly estimate structure, physiological state of biotissue and to determine level of optimal electrosurgical action intensity.

3 cl, 3 dwg

 

The invention relates to medical equipment and can be used in surgery for dissection and coagulation of soft tissues of the body.

Known electrosurgical unit (RU 2154436, AV 18/12 from 20.08.2000 year). This electrosurgical unit contains the power supply, high frequency generator, circuit switching, circuit protection and control, active and passive electrodes, current sensors and voltage control circuit and display. In addition, there is a multiplier to determine the power, Comparators, power supply included power stage, the output of which is connected to the current sensor, and between its two outputs - voltage sensor. The second outputs of the current sensors and voltage are connected to the inputs of the multiplier, the output of which through the first comparator is connected to the input of the power stage of the above power source. A second sensor output voltage is connected via a second comparator with a second input of the power stage of the power source, and the second inputs of the Comparators is connected to the control circuit and display.

The disadvantage of this electrosurgical apparatus is the inability of differentiation of tissues on their structure and physiological States, including healthy and pathological status, for making decisions about the level of required power.

Also known electrical apparatus is khirurgicheskii (EN 2154437, AV 18/12 from 20.08.2000 g), which contains concealer power, high-voltage power supply, a control unit, a low voltage power supply, the first high-frequency pulse Converter, the shaper, the second high-frequency pulse Converter, the third high-frequency pulse Converter, oscillator, power amplifier, the output circuit, active and passive electrodes. The apparatus used concealer power, high voltage power supply and the power supply system based on pulsed high-frequency converters, organized for distribution.

The electrosurgical apparatus (EN 2154437) has the same drawbacks as the previous known electrosurgical unit ((EN 2154436).

A device for cold radiofrequency ablation (EN 2285492, AV 18/18, AV 18/12, AB 5/05 from 20.10.2006,), which contains a source of high frequency current connected to the bipolar electrode placed in a conductive liquid in the cooling unit connected in series with the electrode and measuring the current, the capacitive sensor component of the measurement current, the Comparer and the detector, the unit threshold, the output of which is connected to another input of the comparison, the other output of the sensor of the capacitive component of the measuring unit connected to the measuring input history is Nike high frequency current, and the measuring electrode current is made with possibility of installation on the surface of the bio-object near or around the operating area.

The disadvantages of the known devices include the inability to differentiate types and physiological state of the biological tissue in the operating area based on multifrequency impedancometry, as well as the formation of a certain power effects of RF current to the tissue depending on their electrical parameters (integral of the impedance parameter and coefficient of polarization). In addition, in the known device there is no possibility of determining the speed of movement of the active electrode on the tissue during exposure, which can lead to burns and lack of destructive effects on biological tissue.

Known impedance electrosurgical unit (RU 2204351, AV 18/12 dated 20.05.2003,), which contains the control unit, the unit managed power supply, generators, high and low frequency, is connected through first and second current sensors, the first and second voltage sensors and blocks calculate the impedance at high and low frequencies to the active and passive electrodes. Blocks calculate the impedance connected to the computing unit polarization on Tarasova connected through the block compare to the monitor. The second input unit of comparison associated with posto the NGOs storage device. Electrosurgical unit determines the magnitude of the impedance of the tissue at frequencies of 2 kHz and 440 kHz, calculates the polarization coefficient of the Kpthe tissue, which is equal to the ratio of the magnitudes of the impedances. By comparing the calculated values of the coefficient of polarization Topwith the set defined experimentally and the corresponding healthy or pathological state of the tissue values Topis the identification of physiological condition diagnosed tissues, after which the electrosurgical unit produces power electrosurgical effect corresponding to the received characteristics.

The lack of impedance electrosurgical apparatus (EN 2204351) is that when developing a power electrosurgical effect is not taken into account the speed of movement of the active electrode through the tissue. Another disadvantage is that, if the influence of external factors, when testing biological tissues only two frequencies are likely to get distorted (wrong) value of the impedance of the biological tissue and, accordingly, the polarization coefficient of the Kpthat leads to inaccurate diagnosis of the tissue and, therefore, incorrect formation of the output power of the electrosurgical effect.

The closest analogue of salaamgarage is an electrosurgical unit (RU 2204353, AV 18/12, AV 18/16 from 20.05.2003,). Electrosurgical device includes a control unit, power unit, generator unit, through the current sensor coupled to the active electrode, the sensor voltages included between the transmitter pulse and a persistent storage device (ROM). In addition, the input of the transmitter of the ratio of currents through the measuring current in the circuits of the passive electrodes connected to respective passive electrodes, the output to the first input of the control unit, the output of the transmitter pulse through blocks comparison connected with the second input of the control unit and the second input unit of comparison is connected to ROM.

In electrosurgical apparatus is similar in formation of the electrosurgical power impact takes into account the speed of the active electrode through the tissue. However, the device-analogue has the same drawback, that electrosurgical unit (RU 2204351), namely a low degree of accuracy of diagnosis of various structures and physiological state of tissues. This is because the range of measurement of electrical characteristics produced by the apparatus is not wide enough, and the influence of external factors (electromagnetic interference, topology tissues, various intraoperative status tissues and others) further reduces the accuracy of identification and diagnostic is of biological tissues. The result is inaccurate diagnostics of biological tissues generated by the system device power electrosurgical impact, as well as the duration of the electrosurgical effects that are suboptimal for the operated section of the tissue, which increases the destruction of tissues and leads to the complication of subsequent rehabilitation of the patient.

The task of the claimed invention is to provide an electrical system for oncosurgery, allowing values to be generated power electrosurgical effect, effective for the removal of pathological tissues and sufficient for dissection and coagulation in healthy tissues, by improving the accuracy of diagnosis of tissues of different types and physiological conditions and optimization of cycle time electrosurgical effects on biological tissue.

The essence of the invention lies in the fact that the electrical system for Oncology, containing a control unit, connected through the block electrosurgical effects with the active electrode, measuring the currents through them with passive electrodes and computing the ratio of the currents and block comparison, with the connected unit's permanent memory, introduced interconnected multi-frequency impedance meter, a differentiator, a clock generator and razvyazyvala the device, this multi-frequency impedance meter is connected by its input/output through an isolation device with the active electrode, the second output multi-frequency impedance meter connected through a differentiator to the unit of comparison; to the output of the Comparer is connected to the electrosurgical unit of exposure; a clock generator connected to the input of multi-frequency impedance meter to the input of the isolation device, to the output unit of comparison and to the output of the electrosurgical unit impact.

Multi-frequency impedance meter includes interconnected by means of a signal generator in the frequency range from 0.5 to 2000 kHz, current sensors and voltage, the divider value of the signal register memory.

With the introduction of the proposed electrical system multi-frequency impedance meter, it becomes possible to measure the electrical impedance Z of the tissue at various frequencies f of the pulse in a wide range and the formation of the functional dependence of Z(f).

Introduction to the electrical system of the differentiator provides a calculation based on the measured values Z(f) ratio of polarization Topand the integral of the magnitude of the impedance Zs. Thus, each function Z(f) is not a single value To apas in the case of two-frequency impedance measurements, and a is the set of values of K p, each of which more accurately characterizes a particular type of biological tissue in its particular physiological condition. The computation of the integral of the magnitude of the impedance Zs allows, in case of interference in the electrical system, to discourage private inaccurate values of the impedance Z at certain frequencies, as well as to track changes in the values of Z(f) depending on the physiological state of the tissue.

Thus, a broader set of more accurate and reliable values of the characteristics of the subjects (diagnosed) tissue, allowing more precise diagnosis by comparing the obtained values To privatepand Zs with the given values from the database, different types and physiological state of the tissue. This, in turn, implies that the values Forpand Zs generated power value electrosurgical effect is more optimal for complete removal of pathological tissues and for dissection and coagulation of healthy tissues.

Introduced in electrosurgical system clock generator allows, after receiving them from the power comparison control signal that sets the duration of the loop electrosurgical effect, automatically switch the system to block the lead is anyone forcing and at the end of the loop electrosurgical exposure mode with multi-frequency impedance meter. When this is entered into the system isolation device performs the on/off electrical connection between the active electrode and multi-frequency impedance meter. This automatic control of system operation modes specified by Comparer depending on the value of the velocity of movement of the active electrode and the measured values of impedance, allows to optimize the duration of the loop electrosurgical effects on tissues, i.e. providing such cycle impact output power, which is sufficient for the complete destruction of pathological tissues and, at the same time, eliminates the excessive expansion of the zone of irreversible changes in healthy tissues, which can lead to unnecessarily long lasting effect on biological tissue.

The output control unit of an electrical system for Oncology can be connected to the input of the differentiator. This allows the surgeon with control unit to perform the adjustment calculated by the differentiator values Topand Zs in case of occurrence during the operation of the various intraoperative conditions (bleeding, necrosis etc), when it makes sense to talk about changing Electrophysics the properties of biological tissues. Thereby, decreases the probability of error when diagnosing the type and physiological state of the tissue, and, therefore, further increases the accuracy in determining the mode of electrosurgical effects on biological tissue.

The essence of the invention is illustrated graphic images, in which figure 1 presents a functional diagram of a system for Oncology, figure 2 presents curves that characterize the frequency distribution of electroimpedance muscles when dual frequency (a) and frequency (b) impedancometry, figure 3 presents curves characterizing multi-frequency electroimpedance healthy tissue wall of the small intestine in 2 experiments.

Electrical system for Oncology (figure 1) contains the active electrode 1, an isolation device 2, multi-frequency impedance meter 3, the differentiator 4, block comparison 5, the unit's permanent memory 6, a clock generator 7, the control unit electrical system for Oncology 8, block electrosurgical effects 9, the transmitter of the ratio of the currents of 10, measures the currents 11, 12, 13, passive electrodes 14, 15, 16. The unit's permanent memory 6 stores the following data: the average values of the characteristics of normal and pathological tissues, the power necessary for carrying out electrosurgical effects are provided with the eating of stable optimal hemostasis and ablation in the operating wound, education minimum zone of irreversible changes in the healthy tissues.

When this input-output multi-frequency impedance meter 3 is connected via a decoupling device 2 with the active electrode 1, the second output multi-frequency impedance meter 3 is connected through a differentiator 4-to-block comparison 5; a second input unit of comparison 5 is connected to the unit's permanent memory 6, a third input connected computer ratio of the currents of 10, and connected to the output of the electrosurgical unit impact 9; one of the outputs of the electrosurgical unit impact 9 is connected to the active electrode 1 and to another output - through measuring currents 11, 12, 13 is connected passive electrodes 14, 15, 16 and the transmitter is the ratio of the currents of 10; one of the inputs of the electrosurgical unit impact 9 is connected to the control unit electrical system for Oncology 8, to another input of the oscillator 7; a clock generator 7 connected to the input of multi-frequency impedance meter 3 to the input of the isolation device 2 and to the output of the Comparer 5.

The output control unit of an electrical system for Oncology 8 may be connected to the input of the differentiator 4.

As a decoupling device 2 can be used bi-directional switch. The differentiator 4 can be implemented on the basis of microcontrolle the and. As a unit electrosurgical effects can be used with system generator capacity with adjustable settings.

Multi-frequency impedance meter includes interconnected by means of a signal generator in the frequency range from 0.5 to 2000 kHz, current sensors and voltage, the divider value of the signal register memory (Fig. not shown).

Electrical system for Oncology operates as follows. Multi-frequency impedance meter 3 for measuring the magnitude of electric impedance Z of the tissue in the surgical field between the active electrode 1 and the passive electrodes 14, 15, 16 in the frequency range from 0.5 to 2000 kHz, resulting in a functional relationship (figure 2(b)):

Z(f)=U(f)/I(f).

The differentiator 4 on the basis of the values of Z(f) calculates the formulas electrical parameters Z(f):

private coefficients polarization Top

and integral parameter impedance Zs

where n is the number of frequency measurements,

or

Presented in figure 2 (a, b) curves describing the frequency distribution of electroimpedance muscles when dual frequency (a) and frequency (b) impedancometry illustrate that the function Z(f) is not a single value To apcalculated on the basis of two sacrilegends Z f1and Zf2as in the case of two-frequency impedance measurement (figa), and an integer value set Topcalculated on the basis of several values (Zf1, Zf2...Zfn), each of which more accurately characterizes a particular type of biological tissue in its particular physiological condition.

In the result of interference in the electrical system of the individual impedance values of Z that correspond to specific frequencies can be distorted (figure 3) and, consequently, the accuracy of diagnosis using private coefficients polarization Topcan be reduced. In this case, the calculated integrated value of Zs can eliminate private inaccurate values of the impedance Z at certain frequencies. So, using measurements of the impedance of at least 5-6 reference frequency, the distortion values of the impedance at the two of them, the degree of accuracy of diagnosis by the integral method will be quite high even when using as calculated data values of the impedances corresponding to all frequencies.

When the output control unit of an electrical system for Oncology 8 is connected to the input of the differentiator 4, in case of occurrence during the operation of certain intraoperative conditions (bleeding, necrosis etc), when probably change ELEH the electro physical properties of biological tissues, there is an additional opportunity to make the adjustment calculated by the differentiator 4 values of Kpand Zs. To do this, the surgeon during the operation of the system with individual controls (Fig. not shown)placed on the control unit 8, introduces correction factors Kr and Kz corresponding encountered perioperative conditions against which the differentiator corrects, respectively, of the values Topand Zs:

Calculated and, if necessary, corrected by the differentiator 4 values Topand Zs enter the Comparer 5, in which, by comparing the obtained values Topand Zs values established experimentally and entered into the database of the unit's permanent memory 6, is determined by the type and physiological state of the tissue and is determined by the value of the output power corresponding to a given type and diagnosis of the tissue. The power value is adjusted by block comparison 5 with the light coming from the transmitter of the ratio of currents 10 signal determined by the speed of the active electrode 1 (the speed of the active electrode 1 is determined by computing the ratio of the currents of 10 on the basis of data about the change of currents in the circuits of the passive electrodes 14, 15, 16 recorded is x meters currents 11, 12, 13).

After carrying out the above calculation unit compare 5 generates a modulated signal to the electrosurgical unit impact 9 and defines the value for the output power and, simultaneously, the control signal, the switching clock generator 7 in the mode electrosurgical unit impact 9 and breaks the electrical connection between the active electrode 1 and the multi-frequency impedance meter 3 using decoupling device 2. Block compare 5 sets the length of the loop electrosurgical effect, which is inversely proportional to the speed of the active electrode 1 and is directly proportional to the measured electrical impedance Z. the Modes of operation of the electrosurgical unit exposure 9 (type of dissection and coagulation, as well as the corresponding power level) is determined by the surgeon via the control unit 8.

Thus, by increasing the accuracy of diagnosis of biological tissues and optimization of cycle time electrosurgical impact on the output of the electrosurgical unit impact 9 is formed by the output power of the electrosurgical effect, effective for removal (destruction) of pathological tissues and sufficient for dissection and coagulation in healthy tissues, which is th effect on the operated area of the biological tissue through active 1 passive 14, 15, 16 electrodes.

At the end of the loop electrosurgical impact block compare 5 generates a signal that determines the output power is equal to zero, and, at the same time, a signal for switching the oscillator 7 in the mode of multi-frequency impedance meter 3.

1. Electrical system for Oncology, containing a control unit, connected through the block electrosurgical effects with the active electrode, measuring the currents through them with passive electrodes and computing the ratio of the currents and block comparison with the connected unit's permanent memory, wherein the active electrode through an isolation device connected multi-frequency impedance meter, the output of which is connected to the differentiator, which is connected to one input of the block comparison, to the second input of the multi-frequency impedance meter connected to the oscillator, one of the outputs of which are connected to the electrosurgical unit of exposure, the other output is connected to a decoupling device, and input connected to the Comparer.

2. Electrical system for oncosurgery according to claim 1, characterized in that the control unit is connected to the differentiator.

3. Electrical system for oncosurgery according to claim 1 or 2, characterized in that the multi-frequency measure is ü impedance includes interconnected by means of a signal generator in the frequency range from 0.5 to 2000 kHz, current sensors and voltage, the divider value of the signal register memory.



 

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