CN204600681U - A kind of microwave ablation therapeutic equipment based on microwave power detection protection microwave melt needle - Google Patents

Abstract

The utility model discloses a kind of microwave ablation therapeutic equipment based on microwave power detection protection microwave melt needle, comprise and being made up of microwave melt needle 1, microwave ablation instrument 6, bonder 2, forward detection processing module 3, oppositely detection processing module 4, signal processing module 5.The microwave power that microwave ablation instrument 6 exports is transported to microwave melt needle 1 through main feeder 23; The microwave power that microwave ablation instrument 6 exports, through forward coupler 21 coupling unit output, through forward detection processing module 3 detection process, obtains microwave output power value; The reflection power of microwave melt needle 1, by reverse coupler 22 coupling unit reflection power, through reverse detection processing module 4 detection process, obtains microwave reflection performance number; Signal processing module 5, according to monitoring microwave output power value and microwave reflection performance number, calculates the energy injecting ablation tissue, the output of adjustment or cut-out microwave ablation therapeutic equipment 1.

Description

A kind of microwave ablation therapeutic equipment based on microwave power detection protection microwave melt needle

Technical field

This utility model relates to a kind of microwave ablation therapeutic equipment with microwave ablation needle protection, particularly relates to a kind of microwave ablation therapeutic equipment based on microwave output power, reflection power detection protection microwave melt needle.

Background technology

It is a kind of Wicresoft's targeted therapy to entity tumor that microwave thermal melts, little to tissue injury in ablation process, not hemorrhage, makes the deactivation of neoplasm in situ Clinical Global, and postoperative rehabilitation is fast, can be misery and financial burden that patient reduces operation.But existing microwave ablation instrument and ablation needle be the following problem of ubiquity when Clinical practice:

1, after water cycle blocking, along with the increase of working time, the temperature of ablation needle head part can raise rapidly.When syringe needle and shank junction temperature are more than more than 250 DEG C (PTFE heatproof is 250 DEG C), the matching materials PTFE of junction is just heated by shape, and cause syringe needle and shank junction standing wave to increase, microwave energy forms echo consumption at standing wave point.Along with the increase of working time, standing wave point temperature raises fast, adds that syringe needle is disconnected to be dropped on by the in-house risk of ablated tumor.

2, matching materials PTFE (politef) texture material of ablation needle syringe needle and shank junction is partially soft, when ablation needle insert organize time as run into certain resistance or syringe needle be subject to the stress in non-parallel direction too large time, easily cause syringe needle to bend.After syringe needle is bending, impedance herein changes, and standing wave becomes large.If continual cure, along with the increase of working time, temperature can raise rapidly.In ablation needle, the dielectric material of coaxial cable is also PTFE, if syringe needle place temperature more than 250 DEG C after, can dielectric material be burnt out.Finally cause syringe needle and shank puncture short, blow syringe needle.

3, existing microwave ablation instrument power stage is all open loop circuit substantially, cannot quantize to know the effective power and reflection power that enter ablated tumor tissue, as arranged the monitoring regulation device of power detection device or a plug-in output at microwave ablation instrumentation control system, real-time detector device microwave output power and microwave melt needle reflection power, and can adjust output according to institute's side data in real time, while avoiding broken needle risk, obtain the microwave radiation energy in being organized by ablated tumor, for clinical ablation range provides the quantitative basis of science.

Utility model content

The purpose of this utility model is the deficiency overcoming prior art, a kind of microwave ablation instrument power detection regulation device is provided, real-time detector device microwave output power and microwave melt needle reflection power, adjust output in real time according to by the condition of ablated tumor, reach the therapeutic effect to the overall deactivation of clinical tumor.This utility model is abnormal at microwave melt needle output, judges when reflection power increases according to reflection power increment value, and increasing progressively as jumped reports to the police at once cuts off microwave power and export, and avoids syringe needle to come off by the tumor tissues that melts.

This utility model adopts following technical scheme:

Ablation power change-detection control section of the present utility model as shown in Figure 1, is made up of bonder 2, forward detection processing module 3, oppositely detection processing module 4, signal processing module 5.

Wherein microwave melt needle 1 is the publication number of the applicant is CN101711705, and the patent No. is 200910234273.1, and denomination of invention is the microwave melt needle in " microwave melt needle and microwave ablation therapeutic equipment thereof ".Microwave ablation instrument 6 is the publication number of the applicant is CN101283926, and the patent No. is 200810024956.X, and denomination of invention is the microwave ablation instrument in " microwave power source and microwave ablation therapeutic equipment thereof ".

This utility model comprises and being made up of microwave melt needle 1, microwave ablation instrument 6, bonder 2, forward detection processing module 3, oppositely detection processing module 4, signal processing module 5.

Forward coupler 21, reverse coupler 22 and directional coupler 23 is included in bonder 2;

The microwave power that microwave ablation instrument 6 exports is transported to microwave melt needle 1 through the directional coupler 23 of bonder 2;

The microwave power that microwave ablation instrument 6 exports is through the forward coupler 21 coupling unit output of bonder 2, through forward detection processing module 3 detection process, after ADC conversion, obtain the digital signal of detection, digital signal is converted to microwave output power value through signal processing module 5;

The reflection power of microwave melt needle 1 is by the reverse coupler 22 coupling unit reflection power of bonder 2, through reverse detection processing module 4 detection process, after ADC conversion, obtain the digital signal of detection, digital signal is converted to microwave reflection performance number by signal processing module 5;

Signal processing module 5 according to the reflection power value of Real-Time Monitoring microwave output power value and microwave melt needle, calculate the actual energy being injected ablation tissue by microwave melt needle 1 in real time, adjustment or cut off the output of microwave ablation therapeutic equipment 1.

In ablation procedure, signal processing module 5 according to the reflection power value of Real-Time Monitoring microwave output power value and microwave melt needle 1, in this, as the foundation of power stage adjustment.And calculate the energy of actual injection ablation tissue in real time.As there are reflection power abnormal conditions in the treatment, output can be cut off immediately, and to user's prompting, avoid ablation needle syringe needle to fuse in the situation of human body.

Ablation power change-detection control device can use independent of microwave ablation therapeutic equipment, also can be embedded into microwave ablation therapeutic equipment and use.

Compared with prior art, this utility model tool has the following advantages:

1, preoperative, signal processing module 5, according to the reflection power value of monitoring microwave output power value and microwave melt needle 1, calculates the standing-wave ratio of ablation needle, judges between microwave melt needle 1 and bonder 2, whether intact each several part connects.The control system of instrument is run under safety condition.

2, in ablation procedure, the output of detection of dynamic, display microwave melt needle 1 and reflection power, extrapolate the ablation needle actual net power size entering human body in change procedure in time according to this, for clinical ablation tumor provides the information of accurate quantification, for realizing the automatic control of thermal energy in microwave ablation process, reaching and reference frame is provided to the conformal accurate treatment of tumor.

3, according to the model of microwave melt needle 1 reflection coefficient Changing Pattern under the different operating state set up; judge real-time microwave melt needle output situation; once there is numerical exception (generation as broken needle phenomenon) rupturing duty and alarm protection; prevent the generation of broken needle phenomenon, improve the safety of Clinical practice.

Accompanying drawing explanation

Fig. 1 is theory diagram of the present utility model.

Fig. 2 is this utility model bonder schematic diagram.

Fig. 3 is this utility model forward check processing module principle block diagram.

Fig. 3-1 is this utility model ATT1 and ATT2 theory diagram.

Fig. 3-2 is this utility model BPF theory diagrams.

Fig. 3-3 is this utility model signal condition theory diagrams.

Fig. 4 is this utility model signal processing module 5 theory diagram.

Fig. 5 is 50W output, ablation needle standing wave/time changing curve figure.

Fig. 6 is 60W output, ablation needle standing wave/time changing curve chart.

Fig. 7 is 70W output, ablation needle standing wave/time changing curve figure.

Detailed description of the invention

Below in conjunction with accompanying drawing and detailed description of the invention, this utility model is described in further detail.

Bonder 2, as shown in Figure 2.Be made up of forward coupler 21, reverse coupler 22, directional coupler 23.Microwave ablation instrument 6 export microwave signal, inputted by Pi, directional coupler 23, from Po export, be sent to microwave melt needle 1.Positive bonder 21, the reverse coupler 22 of bonder 2 adopt microstrip line to form, and coupled modes are parallel coupling.For improving certainty of measurement, reduce forward and reverse coupling, influencing each other between output and reflection power, the degree of coupling is set to and is greater than 10dB, and forward and reverse coupling directionality is better than 30dB.Isolation end is used for bonder 2 and measures directionality in testing, can directly connection standard load.Bonder 2 also can adopt coaxial line, rectangular waveguide, circular waveguide, strip line to form, and coupled modes also can adopt Small aperture coupling, branch's coupling or double T.

The forward and reverse coupled signal of bonder 2 enters forward and reverse detection processing module 3 and 4 respectively.Forward detection processing module 3 is made up of ATT1 31, BPF 32, ATT2 33, cymoscope 34, signal condition 35, ADC 36, as shown in Figure 3.The forward coupled signal of bonder 2 is after ATT1 31 decays, and carry out frequency-selective filtering by BPF 32, BPF 32 selectes the current signal melted in frequency, the out-of-band clutter of filtering.BPF 32 decays signal selected after frequency-selective filtering and link impedance matching by ATT2 33 again, then cymoscope 34 is entered, cymoscope 34 is converted to d. c. voltage signal microwave signal, voltage signal after detection is after signal condition 35 filtering, processing and amplifying, ADC 36 is converted to digital signal d. c. voltage signal, carries out Digital Signal Processing by signal processing module 5.Inverse detection processing module 4 composition and operation principle are with forward check processing module 3.

First forward and reverse coupled output signal enters ATT1 31, as shown in figure 3-1.ATT1 31 is adjusted to suitable level magnitudes the microwave signal of coupling output.ATT1 31 can be made up of voltage-controlled attenuator and biasing circuit, as shown in Fig. 3-1A.Biasing circuit provides bias voltage to voltage-controlled attenuator.Voltage-controlled attenuator regulates the PIN pipe attenuation network of voltage-controlled attenuator inside according to coupled output signal, reaches the adjustment to level magnitudes; ATT1 31 also can be ∏ shape attenuating network (as Fig. 3-1B) or the T-shaped attenuating network (as Fig. 3-1C) of fixed value; Also can be digital pad (as model PE4306, HMC306MS10) or RF VGA (as model ADL5240, HMC993LP5E) etc.

The output signal of ATT1 31 enters BPF32, and as shown in figure 3-2, BPF32 is band filter, and the signal in current microwave ablation special frequency band can be passed through, other useless signal of filtering.BPF32 selects passive filter, shown in figure as left in Fig. 3-2.Can adopt LC wave filter, figure as right in Fig. 3-2 is its equivalent circuit.Also microstrip filter, ceramic filter (as model: 3SMT6-915-T10-C, 3SMT-6-2450-T10-C) and SAW filter (as model: TA0495A, TA0223A) etc. can be used.

ATT2 33 adjusts to applicable cymoscope 34 BPF32 output signal level amplitude and processes in amplitude range, and ATT2 33 composition and operation principle are with ATT1 31.

The effect of cymoscope 34 converts the microwave signal that ATT33 exports to certain amplitude voltage, and cymoscope can be detector diode, and also can be integrated RF cymoscope, integrated cymoscope has ADL5906, AD8313, HMC1020LP4E, LMH2121 etc.

Signal condition 35 cymoscope 34 is changed after voltage signal filtering, after processing and amplifying, output to ADC36 and carry out digital-to-analogue conversion, as shown in Fig. 3-3, signal condition 35 is made up of amplifier A, R1 ~ R3, C1 ~ C2, signal condition 35 pairs of signals carry out scale amplifying, and the effect of the isolation played between cymoscope 34 and ADC36 and impedance matching.Wherein R1, C1, C2 are filter circuit, the magnification ratio coefficient of R2, R3 configuration signal signal condition 35 also can use to be penetrated with carrying out isolating and impedance matching.

ADC 36 is Digital to Analog Converter, and the analogue signal of signal condition 35 is converted to digital signal.ADC 36 according to signal processing controller 42 type, can select built-in ADC.Also external independently ADC chip can be selected, such as AD7724, AD7610, ADS8323 etc.

Forward detection processing module 3 and reverse detection processing module 4 conversion after digital signal carry out Digital Signal Analysis process by signal processing module 5, as shown in Figure 4.Signal processing module 5 is made up of communication module 41, signal processing controller 42, display module 43, acousto-optic hint 44.

The ADC digital signal of detecting circuit according to geophone characteristic, can be carried out Data Analysis Services and performance number demarcation by signal processing controller 42.Output power value and reflection power value is drawn after demarcation.Signal processing controller 42 can use MCU (microcontroller), also can use DSP (digital signal processor).

Signal processing controller 42 according to output power value and reflection power value, calculate energy that microwave melt needle 1 injects ablation tissue for clinical ablation scope and melt the time, the parameter adjustment of power provides reference frame.Calculate by following two kinds of methods:

Method one:

In any instant, microwave radiation is to the net power P of ablation tissue _afor:

P _a=P _o× 10 ^(IL/10)– P _r, unit is W

P _ooutput power value: the performance number of directional coupler output port, by obtaining after forward coupling, detection process, unit is W;

P _rreflection power value: namely microwave melt needle or transmission link reflex to the value of directional coupler output port, by obtaining after reverse coupled, detection process, unit is W;

Link load (Insertion Loss) is IL: directional coupler output port is to the loss of microwave ablation radiation syringe needle transmission link, and unit is dB;

Obtain the net power P entering ablation tissue in the unit interval _aafter, the microwave that can calculate in this moment injects the energy Q of tissue:

Q=P _a× T ₁, unit is J

T ₁: representation unit time value, unit is S.

In ablation procedure, the gross energy injecting tissue is:

$\underset{t=0}{\overset{T}{\Σ}}Qt=Q_1+Q_2+Q_3+Q_4\mathrm{.........}{Q}_T,$ Unit is J

T: the time of expression effect, unit is S.

Method two:

According to recording reflection power P in real time _r, by adjustment output P _o, make output net power P _afor steady state value.

If P _afor constant, reflection power P _rwith output P _ocorresponding relation as follows

P _O＝(P _A+P _R)/10 ^(IL/10)

Can calculate in ablation procedure, microwave injects the energy Q of tissue

Q=P _a× T, unit is J

T: the time of expression effect.

Signal processing controller 42 drives display module 43 to show above-mentioned all parameters, and display module 43 can be LED numeral method, also can be LED lattice display or LCD display.

In ablation procedure, the change of the reflection power of normal microwave melt needle is a gradual process.Along with the increase of the time of melting, tissue water content reduces, carbonization gradually around ablation needle radiation needle track, and the reflection of ablation needle can linear increase gradually.When after arrival certain hour, the tissue characteristics around needle track presents stable state, therefore reflection power also substantially constant.According to above-mentioned characteristic, all size ablation needle " time m-standing-wave ratio " model in different tissues can be created.With the ablation needle of 11mm, microwave ablation instrument exports 50W respectively, 60W, 70W is example, Fig. 5 is the ablation needle standing wave/time changing curve figure of 50W output, ablation needle standing wave/time changing curve the figure of Fig. 6 to be the ablation needle standing wave/time changing curve figure, Fig. 7 of 60W output be 70W output.

In ablation procedure, if reflection power exists abnormal conditions, signal processing controller 42 according to reflected value and persistent period, can be confirmed whether as broken needle reflection.Broken needle reflection in this way, then send cut-out microwave by communication module 41 to microwave ablation instrument 6 immediately and export order.Also directly can pass through control signal, cut off microwave ablation instrument 6 microwave and export.Display module 43 shows corresponding status information, and by acousto-optic hint 44, informs to user.Auditory tone cues in acousto-optic hint 44 can be buzzer, also can be verbal cue.Light prompting medium in acousto-optic hint 44 is LED.

Before ablative surgery, after microwave melt needle 1 is connected to bonder 2, signal processing controller 42 can start output power value and the test of reflection power value, after recording output power value and reflection power value by automatic or manual, by following formula, calculate the standing-wave ratio of ablation needle.

First, computational reflect coefficient ρ:

$\mathrm{\ρ}=\sqrt{\frac{\mathrm{Pr}}{Po}}$

P _o: be the performance number of directional coupler output port, unit is W;

P _r: for microwave melt needle and transmission link reflex to the performance number of directional coupler output port, unit is W;

According to reflection coefficient ρ, calculate standing-wave ratio SWR:

$SWR=\frac{1+\mathrm{\ρ}}{1-\mathrm{\ρ}}$

Signal processing controller 42, according to standing-wave ratio size, can judge whether microwave melt needle 1 is connected normally with each connecting portion.And show standing wave value and status information by display module 43, if exist abnormal, by acousto-optic hint 44, inform to user.

Signal processing controller 42 sends above-mentioned all data to microwave ablation instrument 1 by communication module 41, and communication module 41 can be UART, I ²c, SPI, CAN also can be USB, LAN or LPT communication interface.

Claims (2)

1., based on a microwave ablation therapeutic equipment for microwave power detection protection microwave melt needle, comprise and being made up of microwave melt needle (1), microwave ablation instrument (6), bonder (2), forward detection processing module (3), oppositely detection processing module (4), signal processing module (5);

It is characterized in that:

Forward coupler (21), reverse coupler (22) and directional coupler (23) is included in bonder (2);

The directional coupler (23) of the microwave power that microwave ablation instrument (6) exports through bonder (2) is transported to microwave melt needle (1);

The microwave power that microwave ablation instrument (6) exports is through forward coupler (21) the coupling unit output of bonder (2), through forward detection processing module (3) detection process, after ADC conversion, obtain the digital signal of detection, digital signal is converted to microwave output power value through signal processing module (5);

The reflection power of microwave melt needle (1) is by reverse coupler (22) the coupling unit reflection power of bonder (2), through the detection process of reverse detection processing module (4), after ADC conversion, obtain the digital signal of detection, digital signal is converted to microwave reflection performance number by signal processing module (5);

Signal processing module (5) is according to the reflection power value of monitoring microwave output power value and microwave melt needle, calculate the actual energy being injected ablation tissue by microwave melt needle (1) in real time, the output of adjustment or cut-out microwave ablation therapeutic equipment (1).

2. a kind of microwave ablation therapeutic equipment based on microwave power detection protection microwave melt needle according to claim 1, it is characterized in that the forward and reverse coupling of forward coupler (21) and reverse coupler (22), the degree of coupling between output and reflection power is set to and is greater than 10dB; Forward and reverse coupling directionality is better than 30dB.