CN103519888B - Have radio-frequency electrode and the radiofrequency melting instrument of temp sensing function and survey impedance function concurrently - Google Patents
Have radio-frequency electrode and the radiofrequency melting instrument of temp sensing function and survey impedance function concurrently Download PDFInfo
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- CN103519888B CN103519888B CN201310530007.XA CN201310530007A CN103519888B CN 103519888 B CN103519888 B CN 103519888B CN 201310530007 A CN201310530007 A CN 201310530007A CN 103519888 B CN103519888 B CN 103519888B
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Abstract
The invention provides a kind of radio-frequency electrode and the radiofrequency melting instrument that have temp sensing function concurrently and survey impedance function.Wherein, radio-frequency electrode comprises radio frequency point of release, and radio frequency point of release is simultaneously as impedance measurement point; Meanwhile, radio-frequency electrode is connected with the second material, radio-frequency electrode and the second material form temperature thermocouple, and the second material refers to the material being different from structure radio-frequency electrode material therefor, and the link position of the second material is arranged near radio frequency point of release.This radio-frequency electrode, itself there is the function of radio frequency release and impedance measurement, and carry out temperature survey by the current value measuring radio-frequency electrode and the second material weld interface between the two, achieve radio-frequency (RF) ablation, temperature survey and impedance measurement three zones simultaneously.Use this radio-frequency electrode to form radio frequency ablation system, can save in prior art, be arranged at the temperature sensor near radio-frequency electrode and impedance transducer, thus the overall flexibility of radio-frequency electrode is improved, be convenient to the control of radiofrequency ablation procedures.
Description
Technical field
The present invention relates to a kind of radio-frequency electrode, particularly relate to a kind of radio-frequency electrode having temp sensing function concurrently and survey impedance function, also relate to a kind of radiofrequency melting instrument comprising above-mentioned radio-frequency electrode simultaneously, belong to technical field of medical instruments.
Background technology
Radio-frequency technique is a kind of widely used modern minimal invasive technology.In recent years, radio-frequency technique is widely used in the treatment of the multiple lesion tissue such as heart, cancer and even skin.When it utilizes radio-frequency (RF) energy to act on tissue, temperature field characteristic of comparatively concentrating of decay thus point of care rapidly near conductor, carries out minimally-invasive treatment to focus by tiny catheter type probe.
In radio system, radio-frequency electrode is for contacting or carrying out the Primary Component of radio-frequency (RF) energy release near the tissue that is treated.Radio-frequency electrode is used for radiofrequency signal to change into temperature field, is treated tissue by heat effect.
Owing to being generally positioned at body by ablation tissue, concerning visual, tangible doctor unlike traditional operation, therefore, judge that tissue is melted in the process of state doctor, the measurement of tissue temperature and tissue impedance plays very important effect.In prior art, in various radio frequency ablation system, near radio-frequency electrode, one or more sensors are all installed, typically have temperature sensor and impedance transducer.Wherein, temperature sensing is to monitor tissue by the degree heated, thus controls ablation procedure and judge ablation effect.Impedance monitoring, can also auxiliary judgment probe and the contact condition of in-vivo tissue except similar object, and such as larger in impedance when popping one's head in mobile may be contacted because pop one's head in have departed from tissue, and doctor is adjustable probe positions accordingly.The feedback of electric current and voltage is generally used for computer real-time closed-loop control system to the control of ablation procedure.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of radio-frequency electrode having temp sensing function concurrently and survey impedance function.
Another technical problem to be solved by this invention is to provide a kind of radiofrequency melting instrument comprising above-mentioned radio-frequency electrode.
In order to realize above-mentioned goal of the invention, the present invention adopts following technical proposals:
A kind of radio-frequency electrode, described radio-frequency electrode comprises radio frequency point of release, and described radio frequency point of release is simultaneously as impedance measurement point; Described radio-frequency electrode connects the second material, described radio-frequency electrode and described second material form temperature thermocouple, described second material refers to the material being different from and constructing described radio-frequency electrode material therefor, and the link position of described second material is arranged near described radio frequency point of release.
Wherein more preferably, described second material is connected with described radio-frequency electrode by any one mode in welding, plating, socket or crimping.
Wherein more preferably, described radio-frequency electrode comprises the flap electrode suppor be made up of many lobes radio-frequency electrode, and described radio-frequency electrode comprises exposed radio frequency point of release, and described second material is connected in described radio-frequency electrode.
Or wherein more preferably, described radio-frequency electrode is long puncture needle-like electrode, comprises support guide bonding jumper and puncture radio-frequency electrode; Described second material is connected in described puncture radio-frequency electrode.
Wherein more preferably, described radio-frequency electrode is made up of memorial alloy.
Wherein more preferably, described memorial alloy is any one in Nitinol, corronil, titanium alloy.
Wherein more preferably, described second material is any one in ormolu, platinum alloy, fine copper, nichrome.
Comprise a radiofrequency melting instrument for above-mentioned radio-frequency electrode, comprising: central processing unit, sinusoidal wave generation module, signal amplification module, power amplifier module, switch module, radio-frequency electrode module, output voltage current monitoring module and temperature collect module;
There is module and be connected with described central processing unit in described sine wave, described radio-frequency electrode module is connected with described central processing unit by described switch module, and described sine wave generation module, described signal amplification module, described power amplifier module, described switch module are sequentially connected with described radio-frequency electrode module; Described output voltage current monitoring module is connected with described central processing unit and described power amplifier module respectively, and described temperature collect module is connected with described central processing unit and described switch module respectively;
Described central processing unit controls described switch module and carries out mode of operation switching, described central processing unit controls the sine wave that module generation respective frequencies occurs described sine wave simultaneously, described sine wave is after described signal amplification module amplifying signal, again through described power amplifier module power amplification, finally by transferring to described radio-frequency electrode module after described switch module; When described switch module switches to impedance measurement pattern, described output voltage current monitoring module measures the electric current and voltage feed back to described central processing unit that described power amplifier module exports; When described switch module switches to temperature measurement mode, described temperature collect module gathers the Current calculation temperature in the loop of rf and feeds back to described central processing unit.
Wherein preferably, described switch module comprises three switch element S1, S2 and S3 of being set up in parallel, and described radio-frequency electrode module comprises radio-frequency electrode, the thermocouple be made up of radio-frequency electrode and the second material and external electrode; Three switch elements S1, S2 and S3 are respectively used to realize connecting with radio-frequency electrode wire, thermocouple wire and the wire that is connected with described external electrode; Described radio-frequency electrode wire is simultaneously as thermocouple wire, and described radio-frequency electrode wire and described thermocouple wire are connected with described radio-frequency electrode and the second material be connected in described radio-frequency electrode respectively; When the first switch S 1 in described switch module and second switch S2 connect, described radio-frequency electrode and the second material be connected in described radio-frequency electrode form thermocouple measurement loop; When the first switch S 1 in described switch module and the 3rd switch S 3 are connected, described radio-frequency electrode, described external electrode and human body impedance form radio frequency Releasing loop.
Or wherein preferably, described switch module comprises three switch element S1, S2 and S3 of being set up in parallel, and described radio-frequency electrode module comprises radio-frequency electrode, the thermocouple be made up of radio-frequency electrode and the second material and the second radio-frequency electrode; Three switch elements S1, S2 and S3 are respectively used to realize connecting with radio-frequency electrode wire, thermocouple wire and the wire that is connected with described second radio-frequency electrode; Described radio-frequency electrode wire is simultaneously as thermocouple wire, and described radio-frequency electrode wire and described thermocouple wire are connected with described radio-frequency electrode and the second material be connected in described radio-frequency electrode respectively; When the first switch S 1 in described switch module and second switch S2 connect, described radio-frequency electrode and the second material be connected in described radio-frequency electrode form thermocouple measurement loop; When the first switch S 1 in described switch module and the 3rd switch S 3 are connected, described radio-frequency electrode, described second radio-frequency electrode and human body impedance form radio frequency Releasing loop.
Wherein preferably, described radio frequency Releasing loop is simultaneously as impedance measurement loop; In impedance measurement mode of operation, there is module and launch the sine wave of two different frequencies respectively for measurement impedance in described sine wave.
Wherein preferably, in impedance measurement mode of operation, the sinewave output frequency that module occurs described sine wave is respectively 50KHZ and 100KHZ.
Wherein preferably, in radio frequency release mode of operation, the sinewave output frequency that module occurs described sine wave is 465KHZ.
Wherein preferably, to connect a bridge-type compensating circuit at the cold junction in described temperature survey loop.
Radio-frequency electrode provided by the invention, itself has the function of radio frequency release and impedance measurement, by connecting the second material on its surface, forming thermocouple, achieving radio-frequency (RF) ablation, temperature survey and impedance measurement three zones simultaneously.Use this radio-frequency electrode to form radio frequency ablation system, can save in prior art, be arranged at the temperature sensor near radio-frequency electrode and impedance transducer, thus the overall flexibility of radio-frequency electrode is improved, be convenient to the control of radiofrequency ablation procedures.
Accompanying drawing explanation
Fig. 1 is in the first embodiment, the structural representation of the radio-frequency electrode of flap;
Fig. 2 is in the second embodiment, the structural representation of long puncture needle-like radio-frequency electrode;
Fig. 3 is the open configuration schematic diagram of long puncture needle-like radio-frequency electrode shown in Fig. 2;
Fig. 4 is the principle schematic that the second material is connected with plating mode with radio-frequency electrode;
Fig. 5 is the principle schematic that the second material is connected in socket mode with radio-frequency electrode;
Fig. 6 is the principle schematic that the second material is connected in crimping mode with radio-frequency electrode;
Fig. 7 is the complete machine fundamental diagram of the radiofrequency melting instrument comprising radio-frequency electrode provided by the invention;
Fig. 8 is the operation principle schematic diagram of impedance measurement;
Fig. 9 is the temperature survey schematic diagram with cold-junction compensation circuit;
Figure 10 is that single radio-frequency electrode forms the radio frequency release schematic diagram in loop with external electrode;
Figure 11 is the radio frequency release schematic diagram that Double RF electrode forms loop.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, technology contents of the present invention is described in detail.
Radio-frequency electrode provided by the invention, is intended to realize radio frequency release, impedance measurement and thermometric function simultaneously.The basic function of radio-frequency electrode is radio frequency release, by measuring the electrical impedance of the radio frequency point of release of radio-frequency electrode, can realize impedance measurement function.Simultaneously, this radio-frequency electrode is connected with the second material, second material refers to the material being different from structure radio-frequency electrode material therefor, thus radio-frequency electrode and the second material form a temperature thermocouple, realize temperature survey by the current value measuring the linkage interface between radio-frequency electrode and the second material bi-material.In order to improve in radio frequency operation process, the accuracy of monitoring temperature, the link position of the second material is arranged near radio frequency point of release.
First embodiment:
It is the flap radio-frequency electrode that simultaneously can realize three kinds of functions that first embodiment of the invention provides shown in Fig. 1.In this embodiment, adopt the radio-frequency electrode support of Nitinol structure flap, radio-frequency electrode support is made up of three to eight lobe radio-frequency electrodes 1, the front end of all radio-frequency electrodes 1 is welded in public electrode pad A point jointly, form the front end of radio frequency ablation catheter, the rear end of radio-frequency electrode 1 is fixed on the pipe inner wall of radio frequency ablation catheter.Wherein, the overwhelming majority of every lobe radio-frequency electrode 1 is covered by insulating barrier, and only partial denudation forms radio frequency point of release, and radio frequency point of release is simultaneously as impedance measurement point.In this radio-frequency electrode 1, local is connected with the second material 2 ormolu, and the second material 2 ormolu is connected near radio frequency point of release.As shown in Figure 1, in the present embodiment, ormolu is connected to the front end of radio-frequency electrode Nitinol, near public electrode pad A point.During measuring tempeature, by gathering the current value of the linkage interface B (region see arrow indication in dashed circle in Fig. 1) of Nitinol and ormolu, and obtain temperature value through calculating.
The radio-frequency electrode support of the flap made with Nitinol, can recover the state of bent ridge by moulding its form under body temperature that makes, thus make the radio frequency point of release on support adherent.Guiding catheter is had in the outer setting of radio frequency ablation catheter, when implementing radio-frequency ablation procedure, first target tube chamber is inserted in the front end of guiding catheter, radio frequency ablation catheter is inserted in guiding catheter, by the restriction of guiding catheter tube chamber, now the radio-frequency electrode support 1 of flap is compressed in the front end being also always sent to guiding catheter in guiding catheter, after the radio-frequency electrode support 1 of flap exposes guiding catheter, Nitinol starts form when recovering moulding under the impact of body temperature, drive radio frequency point of release adherent, for radio-frequency (RF) ablation creates conditions.After operation terminates, recession radio frequency ablation catheter in guiding catheter, due to by the restriction of guiding catheter tube chamber, the flap radio-frequency electrode support opened by straightening shrinking, until withdrawn from external.
In this embodiment, radio-frequency electrode 1 is connected with radiofrequency melting instrument with common ground wire 3 respectively by effect line 4.Meanwhile, being connected wire in radio-frequency electrode 1 respectively with on the second material 2, it is connected with the temperature collect module in radiofrequency melting instrument, by gathering the faradic current in measuring circuit, realizing temperature survey.
From explanation above, the flap radio-frequency electrode support be made up of Nitinol can revert to arciform through plasticity form under body temperature, and the radio frequency point of release of flap electrode is closely attached on blood vessel endothelium.Wherein, the overwhelming majority of Nitinol covered by insulating barrier (such as, politef), and only barish metal dots forms radio frequency point of release.Simultaneously, in this embodiment, utilize thermocouple principle, the temperature sensor that metallic copper kirsite forms is welded on Nitinol, change along with temperature is produced electric current in various degree by the interface that Nitinol and ormolu are formed, and carries out temperature survey by gathering this current value.Because exposed Nitinol itself possesses Resistance measurement capability, so the measuring circuit that can directly utilize radio-frequency electrode to form carries out human body impedance measuring, just, when measurement impedance, need the impedance measurement error that the thermometric electric current eliminating metal interface causes.
Second embodiment:
Composition graphs 2 and Fig. 3 known, in a second embodiment, provide the long puncture needle-like radio-frequency electrode simultaneously realizing three kinds of functions, its receiving state, see Fig. 2, opens puncture state see Fig. 3.
In the long puncture needle-like radio-frequency electrode shown in Fig. 2, comprise support guide bonding jumper 10, puncture radio-frequency electrode 11, be connected to the second material 12 in puncture radio-frequency electrode 11, altogether ground wire 13, effect line 14 and extension and contraction control line 15.
Wherein, support guide bonding jumper 10 is rectilinear form as shown in Figure 2 when receiving, and support guide bonding jumper 10 can bend to as shown in Figure 3 when opening arciform.The front end of support guide bonding jumper 10 is fixed on public electrode pad, and form the front end of radio frequency ablation catheter, the rear end of support guide bonding jumper 10 is fixed in the catheter wall of radio frequency ablation catheter.
Puncture radio-frequency electrode 11 comprises tip portion 11A and support section 11B two parts.In the embodiment shown in Figure 2, electrode tip portion 11A is bare metal, forms radio frequency point of release; The outside covering insulating material of electrode support portion 11B.Electrode support portion 11B and support guide bonding jumper 10 are fixed, and electrode tip portion 11A forms free end.When support guide bonding jumper 10 opens and bends to arciform, electrode tip portion 11A is projected on arc, contacts with blood vessel endothelium.
Puncture radio-frequency electrode 11 is connected with the second material 12, second material 12 to be connected near the tip portion 11A of puncture radio-frequency electrode 11, near radio frequency point of release.When the radio-frequency electrode 11 that punctures discharges radio frequency, temperature near puncture radio-frequency electrode 11 changes, there is potential difference in the linkage interface now between puncture radio-frequency electrode 11 and the second material 12, by gathering the current value of the linkage interface of both puncture radio-frequency electrode 11 and the second material 12, obtain temperature value through calculating.
Certainly, puncture radio-frequency electrode 11 removes outside tip portion 11A, electrode support portion 11B also can arrange exposed radio frequency point of release, so the second material 12 is according to the difference of radio frequency point of release setting position, also can be arranged on the support section 11B of puncture radio-frequency electrode 11.
In this puncture needle-like radio-frequency electrode, support guide bonding jumper 10 adopts non-memory alloy to construct.In order to realize opening of support guide bonding jumper 10, in this long puncture needle-like radio-frequency electrode, be provided with extension and contraction control line 15, the front end of extension and contraction control line 15 and the public electrode pad of radio-frequency electrode front end are fixed, and rear end is connected with joystick through radio frequency ablation catheter.In use, by pulling extension and contraction control line 15, opening of support guide bonding jumper 10 is realized.
Extension and contraction control line 15 is made up of the tinsel with certain degree of hardness, during by joystick pushed forward control line, owing to promoting radio frequency ablation catheter to move forward, tractive shrinks support guide bonding jumper, and this retracted position is conducive to radio frequency ablation catheter and is inserted in target tube chamber.When radio frequency ablation catheter arrives target tube chamber, extension and contraction control line 15 is reclaimed backward by joystick, owing to affecting the front end of radio frequency ablation catheter, thus force support guide bonding jumper 10 to be transformed into open configuration from contraction state, now, support guide bonding jumper 10 outwards Peng rises, and makes the puncture radio-frequency electrode 11 of puncture needle-like adherent, for radio-frequency (RF) ablation creates conditions.After operation terminates, by driven forward joystick, support guide bonding jumper 10 is shunk, facilitate radio frequency ablation catheter to withdraw from smoothly external.
In this embodiment, radio-frequency electrode 11 is connected to radiofrequency melting instrument respectively by effect line 14 and common ground wire 13.Meanwhile, being connected wire in radio-frequency electrode 11 respectively with on the second material 12, it is connected with the temperature collect module in radiofrequency melting instrument, by gathering the faradic current in measuring circuit, realizing temperature survey.
In sum, the radio-frequency electrode that above-mentioned two embodiments provide, achieves radio-frequency (RF) ablation, temperature survey and impedance measurement three zones simultaneously.Specifically, this radio-frequency electrode, itself has the function of radio frequency release and impedance measurement, by its surface soldered second material, forms thermocouple, achieves temperature measurement function simultaneously.Use this radio-frequency electrode to form radio frequency ablation system, can save in prior art, be arranged at the temperature sensor near radio-frequency electrode and impedance transducer, thus the overall flexibility of radio-frequency electrode is improved, be convenient to the control of radiofrequency ablation procedures.
It should be noted that, in a first embodiment, by Nitinol structure radio-frequency electrode support, because Nitinol is memorial alloy, when it is in suitable temperature, original solid shape can be reverted to, such as, revert to arc under body temperature, thus realize contact and the laminating of radio-frequency electrode 1 and target tube chamber, therefore in a first embodiment, without the need to arranging the lead-in wire making it distortion for the radio-frequency electrode support that stretches, thus, simplify the structure of electrode.Certainly, radio-frequency electrode 1 can also adopt other memorial alloys to construct, such as, and corronil or titanium alloy.When adopting the structure of other alloys outside memorial alloy radio-frequency electrode support, only need arrange in radio frequency ablation catheter pulls radio-frequency electrode support to realize the lead-in wire heaved, and the set-up mode of lead-in wire can see the setting of extension and contraction control line 15 in the second embodiment.Therefore, the material for constructing radio-frequency electrode 1 in the present invention is not limited to memorial alloy, if by telescopic material make both can, such as use memorial alloy, metal etc.In like manner, in the above-described embodiments, ormolu is used to form temperature thermocouple as the second material 2 with Nitinol, other material can certainly be used, such as fine copper alloy or platinum alloy or nichrome, as long as this second material 2 is different from the material of structure radio-frequency electrode support.
Equally, the shape of radio-frequency electrode is not limited to the shape provided in embodiment, and removing flap that the first embodiment provides and the long puncture needle-like that the second embodiment provides, can also be other shape, such as sacculus shape.That is, the shape of radio-frequency electrode itself does not have impact to realizing three kinds of functions simultaneously, actual to use, and existing any shape can be adopted in prior art to construct radio-frequency electrode provided by the present invention.
Two embodiments are to the introduction having the structure of the radio-frequency electrode of temp sensing function and survey impedance function concurrently provided by the invention above.Mention in the introduction above, second material is connected in radio-frequency electrode, and wherein, the connected mode of the second material can have multiple choices, such as use any one realization in welding, plating, socket or crimping to connect, certainly also do not get rid of other connected modes do not enumerated herein.
In order to ensure thermometric accuracy, the requirement that the switching performance demand fulfillment between the second material 2 and radio-frequency electrode 1 is higher.Such as, when using welding manner to connect, in order to ensure the cleanliness factor of solder side, the mode of pressure welding can be used to weld with radio-frequency electrode 1 the second material 2.Other connected modes as shown in Figures 4 to 6.Wherein, plating mode as shown in Figure 4, first removes the part bed material 1a in radio-frequency electrode 1, then goes out the second material 2 by growth in situ on the electrode material removing bed material; As shown in Figure 5, connect radio-frequency electrode 1 and the second material 2 by a union joint 20, radio-frequency electrode 1 contacts in union joint 20 inner tight with the second material 2 socket mode; Second material 2 as shown in Figure 6, is wrapped in radio-frequency electrode 1 by crimping mode, and in its outer cover a becket 20 ', finally use external force becket 20 ' is crimped on the second material 2, realize the connection between the second material 2 and radio-frequency electrode 1.Above-mentioned four kinds of connected modes belong to and illustrate, do not form the restriction be connected with radio-frequency electrode 1 the second material 2.
Above radio-frequency electrode provided by the invention is illustrated, below in conjunction with Fig. 7 to Figure 11, the structure of radiofrequency melting instrument and measuring principle that comprise this radio-frequency electrode is described.
As shown in Figure 7, in radiofrequency melting instrument, comprise sinusoidal wave generation module 21, signal amplification module 22, power amplifier module 23, switch module 24, radio-frequency electrode module, central processing unit 29, output voltage current monitoring module 30, temperature collect module 31, information display module 32 and control module 33.
Wherein, central processing unit 29 is connected with sine wave generation module 21, information display module 32 and control module 33 respectively; Radio-frequency electrode module is connected with central processing unit 29 by switch module 24; Sinusoidal wave generation module 21, signal amplification module 22, power amplifier module 23, switch module 24 are sequentially connected with radio-frequency electrode module.Output voltage current monitoring module 30 is connected with central processing unit 29 and power amplifier module 23 respectively, and temperature collect module 31 is connected with central processing unit 29 and switch module 24 respectively.
In this radiofrequency melting instrument, central processing unit 29 carries out mode of operation switching for gauge tap module 24, and central processing unit 29 generates different sine waves for controlling the sinusoidal wave module 21 that occurs simultaneously; Central processing unit 29 is also for controlling the data acquisition action of output voltage current monitoring module 30, temperature collect module 31, and control information display module 32 carries out information displaying.Information display module 32 shows for radio frequency parameter and various monitoring result.The related circuit that control module 33 comprises multiple regulating key, button and adapts to it, control module 33 is connected with central processing unit 29, can the parameter of radio frequency ablation procedure be regulated by regulable control module 33.
Radiofrequency melting instrument has three kinds of mode of operations, central processing unit 29 gauge tap module 24 switches to wherein a kind of mode of operation, simultaneously central processing unit 29 controls sinusoidal wave the sine wave that module 21 produces respective frequencies under this functional mode to occur, sinusoidal wave after signal amplification module 22 amplifying signal, again through power amplifier module 23 power amplification, transfer to radio-frequency electrode module finally by after switch module 24; When switch module 24 switches to impedance measurement pattern, output voltage current monitoring module 30 measures the electric current and voltage feed back to central processing unit 29 that power amplifier module 23 exports; When switch module 29 switches to temperature measurement mode, temperature collect module 31 gathers the Current calculation temperature in the loop of rf and feeds back to central processing unit 29.
As shown in Figure 7, in this embodiment, switch module 24 comprises three switch element S1, S2 and S3 of being set up in parallel, and radio-frequency electrode module comprises radio-frequency electrode 26, the thermocouple be made up of radio-frequency electrode 26 and the second material and external electrode 28; Three switch elements S1, S2 and S3 are respectively used to realize connecting with radio-frequency electrode wire 25, thermocouple wire 27 and the wire that is connected with external electrode 28; Radio-frequency electrode wire 25 is simultaneously as thermocouple wire, and radio-frequency electrode wire 25 and thermocouple wire 27 are connected with radio-frequency electrode 26 and the second material be connected in radio-frequency electrode 26 respectively; When the first switch S 1 in switch module 24 and second switch S2 connect, radio-frequency electrode 26 forms thermocouple measurement loop with the second material be connected thereon; When the first switch S 1 in switch module 24 and the 3rd switch S 3 are connected, radio-frequency electrode 26 and external electrode 28 form radio frequency Releasing loop; Radio frequency Releasing loop is simultaneously as impedance measurement loop, and when two kinds of mode of operations, the frequency of the sine wave signal that sinusoidal wave generation module 21 produces is different.Wherein, when radio-frequency (RF) ablation mode of operation, the frequency of sine wave signal is 465KHZ, and when impedance measurement mode of operation, the frequency of sine wave signal is respectively 50khz or 100khz two kinds.
In measurement impedance mode of operation, as shown in Figure 8, the sinusoidal wave module 21 that occurs produces sine wave signal, sine wave signal amplifies and power amplifier module 23 power amplification through signal amplification module 22 signal, after switch module 24, then arrive human body impedance 34 through radio-frequency electrode wire 25, radio-frequency electrode 26.Now, first the sinusoidal wave module 21 that occurs produces that frequency is 50khz, power is the sine wave signal of 1W, and voltage when monitoring unloaded and load by output voltage current monitoring module 30, curent change calculate the impedance of people's body loop; Then, sinusoidal wave generation module 21 output frequency is 100khz, and power is that the sine wave signal of 1W is measured again; Finally, by the human body impedance obtained under two kinds of measuring frequencies, get intermediate value and obtain impedance measurements.
In temperature survey mode of operation, the 3rd switch S 3 in switch module 24 is opened, S1 and S2 closes, switch S 1, S2 connect radio-frequency electrode wire 25 and thermocouple wire 27 respectively, radio-frequency electrode wire 25 is simultaneously as thermocouple wire, thus radio-frequency electrode wire 25, thermocouple wire 27 and the thermocouple that is made up of the second material and radio-frequency electrode form loop.The temperature of thermocouple measurement point is calculated by temperature collect module 31 curent change gathered in above-mentioned loop.As shown in Figure 9, in temperature taking process, the contact point A point that two kinds of different materials are connected to form is the hot junction of thermocouple, and the B point away from radio-frequency electrode is cold junction, also referred to as with reference to end, produce electromotive force and faradic current when A point temperature changes in thermocouple closed circuit.Because ambient temperature is in change, reference temperature(TR) is not absolute standard temperature, therefore, as shown in Figure 9, compensates at a cold junction bridge-type compensating circuit of connecting; When variation of ambient temperature, critesistor R0 resistance also changes, and variations in temperature is directly proportional to electromotive force, and the electromotive force produced during now hot-side temperature change converts corresponding digital quantity to through A/D and carries out Temperature displaying after differential amplifier circuit amplifies.
In radio frequency release mode of operation, the radio frequency load mode of radio-frequency electrode is divided into two kinds, a kind of mode of operation being single radio-frequency electrode of using in above-described embodiment and external electrode and forming loop, another kind is the mode of operation that Double RF electrode forms loop, is described respectively below in conjunction with Figure 10 and Figure 11.
See Figure 10, in mode one, each radio-frequency electrode 26 and external electrode 28 form loop.Time radio frequency loads, the sinusoidal wave frequency that module 21 generation occurs is that the sine wave of 465KHZ is through power amplifier, S1 connection signal, be loaded on electrode point of release by wire, radio-frequency electrode 26 forms loop by human body impedance 34 and external electrode 28, measures output voltage current value can calculate and release energy by output voltage current monitoring module 30.
See Figure 11, in mode two, every two radio-frequency electrodes 28 form a loop.Time radio frequency loads, sinusoidal wave occur frequency that module 21 produces be the sine wave of 465KHZ through power amplifier, S1 connection signal, is loaded on electrode point of release by wire, and two radio-frequency electrodes 26 form complete loops by human body impedance 34.Measure output voltage current value by output voltage current monitoring module 30 can calculate and release energy.
In summary, the radio-frequency electrode having temp sensing function concurrently and survey impedance function provided by the invention, temperature survey is carried out by connecting the second material formation temperature thermocouple in radio-frequency electrode, in conjunction with the radio frequency release of radio frequency point of release itself and the function of impedance measurement, radio frequency, temperature survey and impedance measurement three zones can be realized simultaneously.Use the radio system of this radio-frequency electrode, can save in prior art, be arranged at the temperature sensor near radio-frequency electrode and impedance transducer, thus the overall flexibility of radio-frequency electrode is improved, be convenient to the control of radiofrequency ablation procedures, further, above-mentioned radio-frequency electrode is used to improve the precision of temperature survey and impedance measurement.
Use radiofrequency melting instrument provided by the invention, by the impedance of monitoring radio frequency point of release and the temperature of monitoring near radio frequency point of release, can form quantitative feedback to the radio-frequency (RF) ablation situation of tube chamber inside, the doctor's radio frequency ablation procedure being convenient to perform radio-frequency ablation procedure carries out grasping and parameter adjustment.
Above the temp sensing function that has concurrently provided by the present invention is described in detail with the radio-frequency electrode and radiofrequency melting instrument surveying impedance function.For one of ordinary skill in the art, to any apparent change that it does under the prerequisite not deviating from connotation of the present invention, all by formation to infringement of patent right of the present invention, corresponding legal responsibility will be born.
Claims (14)
1. have a radio-frequency electrode for temp sensing function and survey impedance function concurrently, it is characterized in that:
Described radio-frequency electrode comprises radio frequency point of release, and described radio frequency point of release is simultaneously as impedance measurement point; When measurement impedance, eliminate the impedance measurement error that thermometric electric current causes;
Described radio-frequency electrode connects the second material, described radio-frequency electrode and described second material form temperature thermocouple, described second material refers to the material being different from and constructing described radio-frequency electrode material therefor, and the link position of described second material is arranged near described radio frequency point of release.
2. radio-frequency electrode as claimed in claim 1, is characterized in that:
Described second materials'use pressure welding mode is welded with described radio-frequency electrode, to ensure the cleanliness factor of solder side.
3. radio-frequency electrode as claimed in claim 1, is characterized in that:
Described second material is connected with described radio-frequency electrode by plating mode, wherein first removes the part bed material in described radio-frequency electrode, then goes out described second material by growth in situ on the electrode material removing bed material.
4. radio-frequency electrode as claimed in claim 1, is characterized in that:
Described second material is connected with described radio-frequency electrode by crimping mode, is wherein wrapped in described radio-frequency electrode by described second material, becket on the cover of outside, uses external force to be crimped on described second material by described becket.
5. radio-frequency electrode as claimed in claim 1, is characterized in that:
Described radio-frequency electrode comprises the flap electrode suppor be made up of many lobes radio-frequency electrode, and described radio-frequency electrode comprises exposed radio frequency point of release, and described second material is connected in described radio-frequency electrode.
6. radio-frequency electrode as claimed in claim 1, is characterized in that:
Described radio-frequency electrode is long puncture needle-like electrode, comprises support guide bonding jumper and puncture radio-frequency electrode; Described second material is connected in described puncture radio-frequency electrode.
7. radio-frequency electrode as claimed in claim 1, is characterized in that:
Described radio-frequency electrode is made up of memorial alloy.
8. radio-frequency electrode as claimed in claim 7, is characterized in that:
Described memorial alloy is any one in Nitinol, corronil, titanium alloy.
9. radio-frequency electrode as claimed in claim 8, is characterized in that:
Described second material is any one in ormolu, platinum alloy, fine copper, nichrome.
10. comprise a radiofrequency melting instrument for radio-frequency electrode described in claim 1, it is characterized in that comprising: central processing unit, sinusoidal wave generation module, signal amplification module, power amplifier module, switch module, radio-frequency electrode module, output voltage current monitoring module and temperature collect module;
There is module and be connected with described central processing unit in described sine wave, described radio-frequency electrode module is connected with described central processing unit by described switch module, and described sine wave generation module, described signal amplification module, described power amplifier module, described switch module are sequentially connected with described radio-frequency electrode module; Described output voltage current monitoring module is connected with described central processing unit and described power amplifier module respectively, and described temperature collect module is connected with described central processing unit and described switch module respectively;
Described central processing unit controls described switch module and carries out mode of operation switching, described central processing unit controls the sine wave that module generation respective frequencies occurs described sine wave simultaneously, described sine wave is after described signal amplification module amplifying signal, again through described power amplifier module power amplification, finally by transferring to described radio-frequency electrode module after described switch module; When described switch module switches to impedance measurement pattern, described output voltage current monitoring module measures the electric current and voltage feed back to described central processing unit that described power amplifier module exports; When described switch module switches to temperature measurement mode, described temperature collect module gathers the Current calculation temperature in the loop of rf and feeds back to described central processing unit.
11. radiofrequency melting instruments as claimed in claim 10, is characterized in that:
Described switch module comprises three switch elements be set up in parallel (S1, S2 and S3), and described radio-frequency electrode module comprises radio-frequency electrode, the thermocouple be made up of radio-frequency electrode and the second material and external electrode; Three switch elements (S1, S2 and S3) are respectively used to realize connecting with radio-frequency electrode wire, thermocouple wire and the wire that is connected with described external electrode; Described radio-frequency electrode wire is simultaneously as thermocouple wire, and described radio-frequency electrode wire and described thermocouple wire are connected with described radio-frequency electrode and the second material be connected in described radio-frequency electrode respectively; When the first switch (S1) in described switch module and second switch (S2) are connected, described radio-frequency electrode and the second material be connected in described radio-frequency electrode form thermocouple measurement loop; When the first switch (S1) in described switch module and the 3rd switch (S3) are connected, described radio-frequency electrode, described external electrode and human body impedance form radio frequency Releasing loop.
12. radiofrequency melting instruments as claimed in claim 10, is characterized in that:
Described switch module comprises three switch elements be set up in parallel (S1, S2 and S3), and described radio-frequency electrode module comprises radio-frequency electrode, the thermocouple be made up of radio-frequency electrode and the second material and the second radio-frequency electrode; Three switch elements (S1, S2 and S3) are respectively used to realize connecting with radio-frequency electrode wire, thermocouple wire and the wire that is connected with described second radio-frequency electrode; Described radio-frequency electrode wire is simultaneously as thermocouple wire, and described radio-frequency electrode wire and described thermocouple wire are connected with described radio-frequency electrode and the second material be connected in described radio-frequency electrode respectively; When the first switch (S1) in described switch module and second switch (S2) are connected, described radio-frequency electrode and the second material be connected in described radio-frequency electrode form thermocouple measurement loop; When the first switch (S1) in described switch module and the 3rd switch (S3) are connected, described radio-frequency electrode, described second radio-frequency electrode and human body impedance form radio frequency Releasing loop.
13. radiofrequency melting instruments as described in claim 11 or 12, is characterized in that:
Described radio frequency Releasing loop is simultaneously as impedance measurement loop; In impedance measurement mode of operation, there is module and launch the sine wave of two different frequencies respectively for measurement impedance in described sine wave.
14. radiofrequency melting instruments as described in claim 11 or 12, is characterized in that:
To connect a bridge-type compensating circuit at the cold junction in described temperature survey loop.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310530007.XA CN103519888B (en) | 2013-10-30 | 2013-10-30 | Have radio-frequency electrode and the radiofrequency melting instrument of temp sensing function and survey impedance function concurrently |
| PCT/CN2014/000143 WO2014121664A1 (en) | 2013-02-07 | 2014-02-07 | Radio frequency ablation method, system and radio frequency ablation device thereof |
| JP2015556380A JP6453769B2 (en) | 2013-02-07 | 2014-02-07 | Induction cauterization method, system and induction cautery equipment |
| EP14748628.6A EP2954865B1 (en) | 2013-02-07 | 2014-02-07 | Radio frequency ablation method, system and radio frequency ablation device thereof |
| CN201490000298.XU CN205215353U (en) | 2013-02-07 | 2014-02-07 | Radio frequency melts system and radio frequency melts equipment thereof |
| US14/766,637 US9993291B2 (en) | 2013-02-07 | 2014-02-07 | Radio frequency ablation method, system and radio frequency ablation device thereof |
| MYPI2015702559A MY179432A (en) | 2013-02-07 | 2014-02-07 | Radio frequency ablation method, system and radio frequency ablation device thereof |
| ES14748628T ES2921176T3 (en) | 2013-02-07 | 2014-02-07 | Method, radiofrequency ablation system and radiofrequency ablation device thereof |
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| CN201310530007.XA CN103519888B (en) | 2013-10-30 | 2013-10-30 | Have radio-frequency electrode and the radiofrequency melting instrument of temp sensing function and survey impedance function concurrently |
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