CN212234674U - Microwave ablation therapeutic instrument - Google Patents
Microwave ablation therapeutic instrument Download PDFInfo
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- CN212234674U CN212234674U CN201920297149.9U CN201920297149U CN212234674U CN 212234674 U CN212234674 U CN 212234674U CN 201920297149 U CN201920297149 U CN 201920297149U CN 212234674 U CN212234674 U CN 212234674U
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Abstract
The utility model relates to a microwave ablation therapeutic apparatus with a brand new structure, which comprises a therapeutic apparatus body and a microwave ablation needle, wherein the microwave ablation needle is arranged on an interface arranged on the therapeutic apparatus body, the therapeutic apparatus body comprises a microwave power source, a microwave tuning device, the input end of the microwave tuning device is connected with the microwave power source, the output end of the microwave tuning device is connected with the microwave ablation needle, the microwave tuning device comprises a circulator and a signal processing unit, the circulator is provided with a first port, a second port and a third port, the first port is connected with the microwave power source, the second port is connected with the microwave ablation needle, and the third port is connected with the signal processing unit. Is easy to popularize.
Description
Technical Field
The utility model relates to a therapeutic device, in particular to a microwave ablation therapeutic instrument which can automatically change output power according to the characteristics of receptor tissues.
Background
With the development of modern high and new technologies, microwave thermotherapy and microwave coagulation are widely used in the medical research and clinical fields, and meanwhile, the theoretical research and clinical treatment are continuously, deeply and gradually improved. The microwave thermosetting technology is applied to the microwave tumor ablation in medical clinic, and is characterized in that a microwave antenna with a small diameter is inserted into tumor tissue, microwave energy is radiated and directly acts on the tumor tissue, and the temperature of a microwave heat effect area (commonly called a heat field) can reach dozens of degrees centigrade or even hundreds of degrees centigrade within tens of minutes or even minutes, so that the tumor is solidified and necrotized, and the treatment purpose of inactivating the tumor in situ is achieved. The microwave ablation mainly utilizes the comprehensive effect of microwave heating and dipole heating, so that the heating efficiency is high, the speed is high, the tissue necrosis in a coagulation area is uniform and thorough, the curative effect is obvious, the operation is simple and convenient, the wound is small, and the microwave ablation can be more widely applied to the minimally invasive treatment of solid tumors.
At present, microwave ablation needle bodies and microwave ablation needle controllers produced by different manufacturers on the market are not completely compatible, when the microwave ablation needle bodies and the microwave ablation needle controllers produced by different manufacturers are adopted, the conditions of equipment incompatibility and control failure can occur, a series of faults are caused, even if the microwave ablation needle bodies and the microwave ablation needle controllers produced by the same manufacturers are used, the matching performance is still unsatisfactory, the microwave power output to the ablation needles is still reflected to the ablation equipment by 20-30 percent, and because the body conditions of patients are different, the conditions of receptor tissues are different from one another, the reflection can reach 50 percent or more, the treatment effect is necessarily greatly reduced, in order to ensure the treatment effect, the working power of the microwave ablation needles is inevitably required to be improved, higher working temperature is inevitably brought by overhigh power, the microwave ablation needles are easy to break due to overheating, threatens the safety of patients and even causes medical accidents.
Disclosure of Invention
An object of the utility model is to provide a can adjust output's microwave ablation therapeutic instrument by oneself according to patient's organism actual conditions and ablation needle body actual work specification.
The utility model discloses a following technical means realizes: a microwave ablation therapeutic apparatus comprises a therapeutic apparatus body and a microwave ablation needle, wherein the microwave ablation needle is arranged on an interface arranged on the therapeutic apparatus body, the therapeutic apparatus body comprises a microwave power source and a microwave tuning device, the input end of the microwave tuning device is connected with the microwave power source, the output end of the microwave tuning device is connected with the microwave ablation needle, the microwave tuning device comprises a circulator and a signal processing unit, the circulator is provided with a first port, a second port and a third port, the first port is connected with the microwave power source, the second port is connected with the microwave ablation needle, the third port is connected with the signal processing unit, microwave power input from the first port is mainly output to the microwave ablation needle from the second port to generate a heat effect, and reflected power and residual power fed back from the microwave ablation needle are input into the signal processing unit from the third port to be processed, and controlling the output power of the second port in real time. Through the identification of the feedback power, the optimal working power of the ablation needle is directly and effectively obtained, the energy utilization rate is maximized, and the risk of the ablation needle being broken due to overhigh power is avoided.
Furthermore, the signal processing unit comprises a signal receiving part, a judging part and a signal transmitting part, wherein the signal receiving part is connected with the third port of the circulator through a cable, a signal received by the signal receiving part is sent into the judging part to be analyzed and judged, and then the obtained judging part sends a corresponding control signal into the microwave power source through the signal transmitting part to correspondingly control the output power of the microwave power source.
The utility model discloses still include the manual control unit, the manual control unit is direct to be connected with the microwave power source. And the signal processing unit is provided with a change-over switch for changing the control mode. The manual control unit is used, so that the operation can be directly carried out on the premise of determining the working power, the identification action of the signal processing unit is omitted, and the service life of the signal processing unit is prolonged.
Furthermore, the circulator comprises two groups of ferrite disks and three groups of microstrip lines, the two groups of the ferrite disks are arranged and tightly attached to each other, the microstrip lines are arranged on the contact surface of the ferrite disks, the three groups of the microstrip lines are arranged, the included angle between every two of the three groups of the microstrip lines is 120 degrees, the tail ends of the microstrip lines are provided with interfaces, and the outer sides of the ferrite disks are provided with grounding plates.
Preferably, an indicator is connected to the signal processing unit. The microwave working frequency at the moment can be clearly known after the indicator is connected, so that an operator can conveniently and directly know the working condition of the microwave ablation needle, the microwave radiation energy in the ablated tissue can be directly obtained through the indicator, and a scientific quantitative basis is provided for the clinical ablation range.
Compared with the prior art, the utility model, its simple structure, the security is high, can realize output's oneself adaptation, has guaranteed the normal work of melting the needle, and its cost is lower, easily promotes.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a structural diagram of the circulator of the present invention;
FIG. 3 is a schematic diagram of circulator parameters and power flow.
Wherein, the device comprises a 1-ferrite wafer, a 2-microstrip line and a 3-grounding plate.
Detailed Description
The invention is described in further detail below with reference to the drawings in the specification:
the utility model relates to a microwave tumor ablation surgical instrument, in particular to a microwave ablation therapeutic instrument with a brand new structure, which comprises a therapeutic instrument body and a microwave ablation needle, wherein the microwave ablation needle is arranged on an interface arranged on the therapeutic instrument body, the therapeutic instrument body comprises a microwave power source, a microwave tuning device, the input end of the microwave tuning device is connected with the microwave power source, the output end of the microwave tuning device is connected with the microwave ablation needle, the microwave tuning device comprises a circulator and a signal processing unit, the circulator is provided with a first port, a second port and a third port, the first port is connected with the microwave power source, the second port is connected with the microwave ablation needle, the third port is connected with the signal processing unit, the microwave power input from the first port is mainly output from the second port to the microwave ablation needle to generate heat effect, the circulator is a coaxial circulator, and the working frequency of the circulator is 2400MHz-2600 MHz.
The circulator comprises a ferrite wafer 1 and microstrip lines 2, wherein the ferrite wafer 1 is provided with two groups and is arranged in a close fit manner, the microstrip lines 2 are arranged on a contact surface of the ferrite wafer 1, the microstrip lines 2 are provided with three groups, the included angle between every two of the three groups of microstrip lines 2 is 120 degrees, the tail end of each microstrip line 2 is provided with an interface, and the outer side of the ferrite wafer 1 is provided with an earth plate 3.
In the present invention, the ferrite wafer 1 constitutes a resonant cavity, and can generate the lowest order single mode electromagnetic field varying according to cosine (or sine), which is determined by its structural size and ferrite material characteristics. When a bias magnetic field is applied to the ferrite, this single-mode electromagnetic field splits into two resonant modes, the resonant frequencies of which are slightly different. The operating frequency is selected such that the two mode electromagnetic fields overlap and add at the output and cancel at the isolated end, thereby achieving directional transmission of electromagnetic energy.
The three-port device can realize matching at each port simultaneously, thereby realizing no loss. For a lossless three-port device whose sum of the squares of the modes of the three elements of each row (or each column) of the scattering matrix is equal to 1, the scattering matrix of such an ideal circulator is typically of the form:
this means that power flow can be conducted from the first port to the second port, from the second port to the third port and from the third port to the first port, but not necessarily in the reverse direction. The circulator used by the machine adopts a permanent magnet as a bias field. The microwave power of microwave power source output carries the first port of circulator through the main feeder, and the overwhelming majority of its microwave power can be exported through the second port, and the fractional power can "leak" to the third port (this is caused because the isolation nonideal of circulator), and the microwave power of second port output feeds the microwave ablation needle through the connector and produces the fuel factor, the utility model discloses in, microwave power transmission direction be clockwise, first port, second port and third port clockwise setting promptly.
Since the output of the microwave ablation needle for the microwave power cannot be perfectly matched, especially when the microwave ablation needle is in a treatment state in the subject, the mismatch will be different due to the difference of the tissue of the subject. Thereby causing the power reflected by the microwave ablation needle to the second port to also vary. The reflected power input by the second port is output through the third port, and enters the signal processing unit together with the leaked power due to non-ideal isolation degree for relevant data processing. Before the microwave ablation needle is connected, the matched load can be connected firstly, and because the reflection coefficient of the matched load is very small, the reflection power is also very small, and the system calibration can be carried out before the operation. The processing data and calibration data of the signal processing unit can be used for evaluating the power energy received by different receptor tissues through the microwave ablation needle.
Furthermore, the signal processing unit comprises a signal receiving part, a judging part and a signal transmitting part, wherein the signal receiving part is connected with the third port of the circulator through a cable, a signal received by the signal receiving part is sent into the judging part to be analyzed and judged, and then the obtained judging part sends a corresponding control signal into the microwave power source through the signal transmitting part to correspondingly control the output power of the microwave power source.
Specifically, a table is arranged in the judging part, after the judging part receives a feedback signal transmitted from the second port, the signal is matched with data in the table to obtain an output power value under the signal intensity, and then the power value is input into a microwave power source through the signal transmitting part to adjust the output power of the microwave power source.
The utility model discloses still include the manual control unit, the manual control unit is direct to be connected with the microwave power source. And the signal processing unit is provided with a change-over switch for changing the control mode. The manual control unit is used, so that the operation can be directly carried out on the premise of determining the working power, the identification action of the signal processing unit is omitted, and the service life of the signal processing unit is prolonged.
Preferably, an indicator is connected to the signal processing unit. The microwave working frequency at the moment can be clearly known after the indicator is connected, so that an operator can conveniently and directly know the working condition of the microwave ablation needle, the microwave radiation energy in the ablated tissue can be directly obtained through the indicator, and a scientific quantitative basis is provided for the clinical ablation range.
The present invention is explained in detail below by way of specific examples:
firstly, the power output from the microwave power source to the port 1 of the circulator is defined as P01Output power of port 2 is P02The power reflected from the ablation needle to port 2 is Pr2The output power leaked from the port due to the non-ideal circulator isolation is P03；
From a theoretical value, P can be characterized by the following equation based on the S parameter of the circulator02And P03And P01The relationship of (1):
P02＝P01(S21)2
when the port 2 is connected into the ablation needle to cause reflection, the reflected power P is providedr2，Considering S32The influence of (a) on the performance of the device,
P03＝P01(S31)2+ Pr2(S32)2
S21、S32respectively representing the transmission loss of ports 1-2 and 2-3 of the circulator in forward transmission, and S is small because the transmission loss of the circulator is21、S32Typically close to 1.
And S31Characterizing the isolation, S, of circulator port 3 to port 131Typically very small, typically when the isolation is 20 dB; (S)31）2Is 0.01; when the isolation is 30dB, (S)31）20.001, and so on. The utility model discloses well insertion loss, isolation all are the intrinsic parameter of circulator, all can measure by the experiment very conveniently.
Before actual use, the ablator is calibrated, specifically, a matched load is connected to the port 2 of the circulator, the power output from the port 2 is absorbed by the load completely and is not reflected, but the input power of the port 1 is leaked at the port 3 due to the non-ideal isolation of the circulator, the power output from the port 3 due to the leakage has a fixed proportional relation with the power of the port 1, the isolation of the circulator is related to the isolation, which is similar to the relation between the coupling end and the input end of a directional coupler with loose coupling, that is, only a small part of the power is coupled (or leaked) from the main transmission channel, and the coupling (or isolation) can be measured and quantitatively characterized.
Can be written as P03＝P01（S31）2Therefore P is03And P01The difference is a fixed multiple, and the difference can be displayed and stored after the detection and amplification processing.
Secondly, connecting an ablation needle to the output end of the ablation instrument (namely the port 2 of the circulator), inputting the reflected power caused by the ablation needle to the port 2, and assuming that the reflection coefficient caused by the ablation needle is rho, then reflecting the power Pr2＝ ρ2P02Considering the insertion loss from port 2 to port 3, the reflected power is transmitted to port 3, and the output generated at port 3 is Pn3＝ ρ2P02（S32）2For a circulator, the forward loss is small, so S32And S21As close to 1. Since the reflected power is much larger than the leakage power of the port 3 due to the non-ideal isolation of the circulator (the reflection coefficient is generally 0.2-0.4, even larger than 0.4, and the leakage power or coupling power considered as under the loose coupling condition is generally 0.001-0.01 depending on the isolation), the superposition effect of the original leakage power can be basically ignored when the reflected power is measured. The reflected power at port 3 should first be reduced by the same factor (i.e., S) as the isolation level31Square) and then the ablation needle induced reflection coefficient can be obtained as compared to the power obtained at port 3 at calibration. Namely:
Pn3/P01＝ρ2in which P is01=P03(S31)2
The standing wave ratio can be expressed as VSWR = (1+ ρ)/(1- ρ)
The reflection coefficient rho of the ablation needle can change along with the change of factors such as different characteristics of the inserted tissue, working time of the ablation needle and the like, so that the display of the reflected power on an instrument after detection and amplification can also change continuously. The instrument is provided with a corresponding circuit, when the reflected power reaches a threshold value, a sound or flash display alarm is given, when necessary or the circuit is automatically cut off, the threshold value can be freely adjusted along with the actual situation, the sound alarm mode can adopt a buzzer or a voice sounding device, if the voice sounding device is used, the device can also broadcast the use state of the ablation needle, such as the real-time value of the output power, the working state of the ablation needle and the like, when in daily use, and the circuit is integrated in a signal processing unit.
Third, the net power P into the ablation needlenet：
Pnet＝P02— Pr2
During time t, net power PnetConversion to heat Q, i.e. the integral of net power over time:
Qgeneral assembly＝Pnet TGeneral assembly
The reflected power and the net power of the ablation needle change along with the change of time, and the heat applied to the physiological tissues by the ablation needle is as follows:
Qgeneral assembly＝Pnet1* T1+Pnet2*T2 +...... ＋Pnet n* Tn
The microwave power can be stored and displayed after being processed by detection, amplification and the like, and the time obtained by timing with the system can also be stored and displayed after being processed for the reference of a user during operation.
Claims (5)
1. The utility model provides a microwave ablation therapeutic instrument, includes therapeutic instrument body and microwave ablation needle, microwave ablation needle set up on the interface that therapeutic instrument body set up, its characterized in that: the therapeutic instrument body comprises a microwave power source, a microwave tuning device, wherein the input end of the microwave tuning device is connected with the microwave power source, the output end of the microwave tuning device is connected with a microwave ablation needle, the microwave tuning device comprises a circulator and a signal processing unit, the circulator is provided with a first port, a second port and a third port, the first port is connected with the microwave power source, the second port is connected with the microwave ablation needle, the third port is connected with the signal processing unit, microwave power input from the first port is mainly output to the microwave ablation needle through the second port to generate a heat effect, reflected power and residual power fed back from the microwave ablation needle are input into the signal processing unit through the third port to be processed, and output power of the second port is controlled in real time.
2. A microwave ablation treatment apparatus according to claim 1, wherein: the signal processing unit comprises a signal receiving part, a judging part and a signal transmitting part, wherein the signal receiving part is connected with a third port of the circulator through a cable, a signal received by the signal receiving part is sent into the judging part to be analyzed and judged, and then the obtained judging part sends a corresponding control signal into the microwave power source through the signal transmitting part to correspondingly control the output power of the microwave power source.
3. A microwave ablation treatment apparatus according to claim 1, wherein: the microwave oven also comprises a manual control unit, wherein the manual control unit is directly connected with the microwave power source, and the signal processing unit is provided with a change-over switch for changing the control mode.
4. A microwave ablation treatment apparatus according to claim 1, wherein: the circulator comprises two groups of ferrite wafers and three groups of microstrip lines, the two groups of the ferrite wafers are arranged and tightly attached to each other, the microstrip lines are arranged on the contact surface of the ferrite wafers, the three groups of the microstrip lines form an included angle of 120 degrees between every two of the three groups of the microstrip lines, an interface is arranged at the tail end of each microstrip line, and an earth plate is arranged on the outer side of each ferrite wafer.
5. A microwave ablation treatment apparatus according to claim 1, wherein: an indicator is connected to the signal processing unit.
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| CN201920297149.9U CN212234674U (en) | 2019-03-10 | 2019-03-10 | Microwave ablation therapeutic instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112603531A (en) * | 2020-12-31 | 2021-04-06 | 南京康友医疗科技有限公司 | Method, system and device for preventing ablation needle head from falling off |
| CN113100927A (en) * | 2021-04-08 | 2021-07-13 | 电子科技大学 | Novel directional microwave ablation antenna based on substrate integrated coaxial cable |
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2019
- 2019-03-10 CN CN201920297149.9U patent/CN212234674U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112603531A (en) * | 2020-12-31 | 2021-04-06 | 南京康友医疗科技有限公司 | Method, system and device for preventing ablation needle head from falling off |
| CN112603531B (en) * | 2020-12-31 | 2022-08-16 | 南京康友医疗科技有限公司 | Method, system and device for preventing ablation needle head from falling off |
| CN113100927A (en) * | 2021-04-08 | 2021-07-13 | 电子科技大学 | Novel directional microwave ablation antenna based on substrate integrated coaxial cable |
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