Microwave ablation needle

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a microwave ablation needle. The utility model provides a microwave ablation needle, which aims to solve the problems of skin scald and carbonization of a central area of an ablation focus caused by heat accumulation of a needle point after an ablation needle in the prior art is used for a long time, and comprises an outer shell with an installation space inside, a needle rod is fixedly connected onto the outer shell, and an ablation needle head is arranged at one end of the needle rod. One end of the ablation needle head extends into the ablation needle, the other end of the ablation needle head extends into the mounting space, a cooling system is arranged in the mounting space, a conveying pipeline for conveying a cooling medium is arranged in the needle rod, and an internal temperature measuring ring is arranged between the conveying pipeline and the ablation needle head. The cooling medium can be sent to the ablation needle head through the needle head cooling cavity, so that the heat accumulation condition of the ablation needle head is effectively reduced, the phenomena of skin scald and carbonization of a central area of an ablation focus are reduced, and the shape of a solidification necrosis area of microwave ablation is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, especially relates to a microwave ablation needle. BACKGROUND

[0002] Microwave ablation therapy is a kind of treatment method with high efficiency, fast, uniform heating, complete heat coagulation, convenient use and safety to tumor tissue, and has been widely used in clinic for many years.The microwave energy emitted by microwave ablation therapy instrument is transmitted to the ablation needle and radiated to the tumor lesion tissue, and the microwave makes the ions and polar water molecules in the tissue rotate and vibrate, and rub each other to produce heat effect, so that the tumor cell protein is denatured and coagulated through heat form, which leads to irreversible necrosis, so as to achieve the purpose of tumor treatment.The single microwave ablation needle in the prior art cannot detect the temperature at the needle tip, cannot make real-time adjustment to the temperature change at the needle tip, and needs to be matched with another temperature measuring needle to test the temperature change in the tumor tissue, so that the patient needs to insert the ablation needle and the temperature measuring needle at the same time during the ablation operation, which not only causes secondary puncture injury to the patient, but also increases the operation difficulty of the doctor.

[0003] For example, a kind of microwave ablation needle is disclosed in Chinese invention patent [application number: CN202011479024.1].The invention includes ablation needle main part, the ablation needle main part includes needle head, insulating sleeve, outer needle wall and coaxial cable, the insulating sleeve is arranged on the outside of needle head, the insulating sleeve is connected with outer needle wall, the coaxial cable is arranged in outer needle wall, and the cavity for containing cooling liquid for cooling the coaxial cable is arranged between coaxial cable and outer needle wall;Coaxial cable includes coaxial cable inner core, insulating layer and shielding layer, coaxial cable inner core, insulating layer and shielding layer are arranged from inside to outside coaxial core, and coaxial cable inner core and shielding layer are separated by insulating layer;The coaxial cable inner core forwardly extends to form coaxial cable inner core front end at exposed position, and the coaxial cable inner core front end is fixedly connected with needle head rear end, and metal powder is arranged at the connection between coaxial cable inner core front end and needle head rear end.

[0004] Although the invention has the advantages of ensuring good conductivity and thermal conductivity of the ablation needle, and can bring better effect in suitable application scenarios, the above problems have not been solved. SUMMARY

[0005] The utility model aims at the above problem, and provides a kind of microwave ablation needle.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] A microwave ablation needle comprises an outer shell having an installation space inside, a needle rod fixedly connected to the outer shell, one end of the needle rod being provided with an ablation needle head, the other end extending into the installation space, the ablation needle head being connected to a microwave interface connected to the outer shell through a cable for transmitting microwave signals, a cooling system being provided in the installation space, a delivery pipeline for delivering cooling medium being provided in the needle rod, one end of the delivery pipeline being in communication with the cooling system, and a needle head cooling cavity being provided inside the ablation needle head, the other end of the delivery pipeline being in communication with the needle head cooling cavity.

[0008] In the microwave ablation needle, the cooling system comprises a water return tank and a water inlet tank, a water outlet pipe being connected to the water return tank, and a water inlet pipe being connected to the water inlet tank, the delivery pipeline being in communication with the water return tank and the water inlet tank respectively.

[0009] In the microwave ablation needle, the water return tank and the water inlet tank share one outer shell, and the cavities inside the water return tank and the water inlet tank for storing cooling medium are separated by a water tank separation block.

[0010] In the microwave ablation needle, the delivery pipeline comprises a water inlet pipe, one end of the water inlet pipe being in communication with the water inlet tank, the other end being in communication with the needle head cooling cavity, an outer side wall of the water inlet pipe and an inner side wall of the needle rod forming a water return cavity, one end of the water return cavity being in communication with the water return tank, a through hole being formed in the side wall of the water inlet pipe, and the water inlet pipe being in communication with the water return cavity through the through hole.

[0011] In the microwave ablation needle, the through hole is located on the side of the water inlet pipe close to the ablation needle head, the through hole has a plurality of through holes arranged along the axial line of the water inlet pipe.

[0012] In the microwave ablation needle, an internal temperature measuring ring is arranged between the water inlet pipe and the ablation needle head.

[0013] In the microwave ablation needle, an external temperature measuring ring is arranged between the needle rod and the ablation needle head.

[0014] In the microwave ablation needle, the cable comprises an outer conductor, a dielectric layer and an inner core from outside to inside, one end of the dielectric layer and the inner core extending to the outside of the outer conductor and extending into the ablation needle head, and the outer side surface of the dielectric layer being sealingly connected to the ablation needle head.

[0015] In the microwave ablation needle, a choke coil in a cylindrical structure is fixedly connected to the outer side of the outer conductor.

[0016] In the microwave ablation needle, the axial lines of the outer conductor, the dielectric layer, the inner core, the choke coil and the ablation needle head are coincident.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] 1, the utility model discloses the inside temperature measurement ring of being equipped with at ablation needle head, inside temperature measurement ring can monitor the temperature of cooling medium at ablation needle head in real time, the numerical value is fed back to host computer, when temperature is too high, can pass to the increase motor speed, increase cooling water flow rate, make ablation needle head temperature rapid recovery normal, prevent the carbonization of ablation focus central area caused by ablation needle head temperature too high, when temperature rapid heating reaches the overtemperature threshold value, ablation stops immediately, can prevent the needle breakage caused by ablation needle head because of temperature abnormal rise, greatly increase the operation safety.

[0019] 2, the utility model discloses the choke coil still fixed at the outside of outer conductor, and the choke coil can effectively inhibit the "tail" residual heat of microwave ablation antenna along the needle rod direction, and better microwave waveform is formed.

[0020] 3, the utility model discloses the outside temperature measurement ring between needle rod and ablation needle head, and the outside temperature measurement ring can monitor the temperature outside ablation needle head in real time, and the numerical value is fed back to host computer, when temperature is too high, can pass to the decrease power output, reduce ablation needle head temperature, prevent the carbonization of ablation focus central area caused by ablation needle head temperature too high, when temperature rapid heating reaches the overtemperature threshold value, ablation stops immediately, can prevent the needle breakage caused by ablation needle head because of temperature abnormal rise, greatly increase the operation safety.

[0021] 4, the utility model discloses the cooling medium can be sent to ablation needle head through needle head cooling cavity, effectively reduces the heat accumulation of ablation needle head, reduces the scald of skin and the carbonization phenomenon of ablation focus central area, improves the solidified necrosis area form of microwave ablation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the perspective view of the utility model;

[0023] Figure 2 It is the sectional view of the utility model;

[0024] Figure 3 It is the structure schematic view of part structure of the utility model;

[0025] In the drawing: installation space 1, outer shell 2, needle rod 3, ablation needle head 4, cooling system 5, conveying pipeline 6, needle head cooling cavity 7, cable 8, microwave interface 9, inside temperature measurement ring 10, outside temperature measurement ring 11, backwater tank 51, water inlet tank 52, water outlet pipe 53, first water inlet pipe 54, water tank isolation block 55, second water inlet pipe 61, backwater cavity 62, through -hole 63, outer conductor 81, dielectric layer 82, inner core 83, choke coil 84. DETAILED DESCRIPTION

[0026] The utility model will be further explained in detail in combination with the drawings and specific embodiment.

[0027] In combination Figure 1 And Figure 2 As shown in the microwave ablation needle, the outer shell 2 has an installation space 1 inside, the needle shaft 3 is fixedly connected to the outer shell 2, one end of the needle shaft 3 is provided with an ablation needle head 4, the ablation needle head 4 can be made of ceramic material. The other end extends into the installation space 1, the ablation needle head 4 is connected with the microwave interface 9 connected to the outer shell 2 through the cable 8 for transmitting microwave signals, the installation space 1 is provided with a cooling system 5, the needle shaft 3 is provided with a conveying pipeline 6 for conveying cooling medium, and the cooling medium can be water. One end of the conveying pipeline 6 is communicated with the cooling system 5, and the conveying pipeline 6 further comprises a needle head cooling cavity 7 arranged in the ablation needle head 4, and the other end of the conveying pipeline 6 away from the cooling system 5 is communicated with the needle head cooling cavity 7.

[0028] The utility model discloses, when using, cooling medium is outputted to the conveying pipeline 6 in cooling system 5, and is conveyed to the needle head cooling cavity 7 through the conveying pipeline 6, realizes the cooling of ablation needle head 4. Therefore, the utility model discloses can send cooling medium to ablation needle head 4 through needle head cooling cavity 7, effectively reduces the heat accumulation of ablation needle head 4, reduces skin scald and carbonization phenomenon in the central region of ablation focus, and improves the solidification necrosis area form of microwave ablation.

[0029] As Figure 2 As shown in the figure, the cooling system 5 comprises a water return tank 51 and a water inlet tank 52, a water outlet pipe 53 is communicated on the water return tank 51, a first water inlet pipe 54 is communicated on the water inlet tank 52, and the conveying pipeline 6 is communicated with the water return tank 51 and the water inlet tank 52 respectively.

[0030] Preferably, the water return tank 51 and the water inlet tank 52 share an outer shell, and the cavities in the water return tank 51 and the water inlet tank 52 for storing cooling medium are separated by a water tank separation block 55. In this way, the installation space required can be saved, and the product structure is simplified.

[0031] As Figure 3 As shown in the figure, the conveying pipeline 6 comprises a second water inlet pipe 61, one end of the second water inlet pipe 61 is communicated with the water inlet tank 52, the other end is communicated with the needle head cooling cavity 7, the outer side wall of the second water inlet pipe 61 and the inner side wall of the needle shaft 3 form a water return cavity 62, one end of the water return cavity 62 is communicated with the water return tank 51, and the second water inlet pipe 61 is provided with a through hole 63 in the side wall, and the second water inlet pipe 61 is communicated with the water return cavity 62 through the through hole 63.

[0032] In use, the cooling medium is delivered to the water inlet tank 52 through the first water inlet pipe 54, and then delivered to the needle cooling cavity 7 through the second water inlet pipe 61. After heat exchange, the cooling medium can be discharged into the return water cavity 62 through the through hole 63 and flow back into the return water tank 51, and finally discharged through the water outlet pipe 53.

[0033] Preferably, the through holes 63 are located on the side of the second water inlet pipe 61 near the ablation needle 4, and there are several through holes 63 arranged sequentially along the axis of the second water inlet pipe 61. This can better ensure the smooth flow of the cooling medium in the needle cooling cavity 7.

[0034] like Figure 3 As shown, an internal temperature measuring ring 10 is provided between the second water inlet pipe 61 and the ablation needle 4. This invention provides an internal temperature measuring ring 10 between the second water inlet pipe 61 and the ablation needle 4. The internal temperature measuring ring 10 can monitor the temperature of the cooling medium at the ablation needle 4 in real time and feed the value back to the host. When the temperature is too high, the motor speed and cooling water flow rate can be increased to quickly restore the temperature at the ablation needle 4 to normal, preventing carbonization of the central area of ​​the ablation zone due to excessive temperature. When the temperature rises rapidly to the over-temperature threshold, ablation stops immediately, preventing the ablation needle 4 from breaking due to abnormal temperature rise and greatly increasing surgical safety.

[0035] like Figure 3 As shown, an external temperature measuring ring 11 is provided between the needle rod 3 and the ablation needle 4. This invention provides an external temperature measuring ring 11 between the needle rod 3 and the ablation needle 4. The external temperature measuring ring 11 can monitor the temperature outside the ablation needle 4 in real time and feed the value back to the host. When the temperature is too high, the power output can be reduced to lower the temperature of the ablation needle, preventing carbonization of the central area of ​​the ablation zone due to excessive temperature. When the temperature rises rapidly to the over-temperature threshold, ablation stops immediately, preventing the ablation needle 4 from breaking due to abnormal temperature rise and greatly increasing surgical safety.

[0036] like Figure 3 As shown, the cable 8 comprises, from the outside to the inside, an outer conductor 81, a dielectric layer 82, and an inner core 83. One end of both the dielectric layer 82 and the inner core 83 extends beyond the outer conductor 81 and into the ablation needle 4. The outer surface of the dielectric layer 82 is sealed to the ablation needle 4. The centerlines of the outer conductor 81, dielectric layer 82, inner core 83, choke coil 84, and ablation needle 4 are all coincident.

[0037] Preferably, a choke coil 84 with a cylindrical structure is fixedly connected to the outer side of the outer conductor 81. The choke coil 84 fixed to the outside of the outer conductor 81 effectively suppresses residual heat from the "tail" of the microwave ablation antenna along the needle rod 3, resulting in a better microwave waveform.

[0038] The specific embodiments described herein merely exemplify the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0039] Although the terms such as installation space 1, outer shell 2, needle rod 3, ablation needle head 4, cooling system 5, conveying pipeline 6, needle head cooling cavity 7, cable 8, microwave interface 9, internal temperature measuring ring 10, external temperature measuring ring 11, water return tank 51, water inlet tank 52, water outlet pipe 53, first water inlet pipe 54, water tank isolation block 55, second water inlet pipe 61, water return cavity 62, through hole 63, outer conductor 81, dielectric layer 82, inner core 83, choke coil 84 are used more frequently herein, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any additional limitation by interpreting them is contrary to the spirit of the present application.

Claims

1. A microwave ablation needle, comprising an outer housing (2) with an installation space (1) inside, a needle shaft (3) fixedly connected to the outer housing (2), one end of the needle shaft (3) being provided with an ablation needle head (4), the other end extending into the installation space (1), the ablation needle head (4) being connected to a microwave interface (9) connected to the outer housing (2) through a cable (8) for transmitting microwave signals, a cooling system (5) being provided in the installation space (1), a delivery pipeline (6) for delivering a cooling medium being provided in the needle shaft (3), one end of the delivery pipeline (6) being in communication with the cooling system (5), characterized in that: The temperature measuring ring (10) is arranged between the delivery pipeline (6) and the ablation needle (4).

2. The microwave ablation needle of claim 1, wherein: The needle cooling cavity (7) is arranged in the ablation needle (4), and the delivery pipeline (6) is connected to the needle cooling cavity (7) away from the cooling system (5).

3. A microwave ablation needle as defined in claim 2, wherein: The cooling system (5) comprises a water return tank (51) and a water inlet tank (52), the water outlet pipe (53) is connected to the water return tank (51), the first water inlet pipe (54) is connected to the water inlet tank (52), and the delivery pipeline (6) is connected to the water return tank (51) and the water inlet tank (52) respectively.

4. A microwave ablation needle as defined in claim 3, wherein: The water return tank (51) and the water inlet tank (52) share an outer shell, and the cavities for storing the cooling medium in the water return tank (51) and the water inlet tank (52) are separated by the water tank separation block (55).

5. A microwave ablation needle as defined in claim 3, wherein: The delivery pipeline (6) comprises a second water inlet pipe (61), one end of the second water inlet pipe (61) is connected to the water inlet tank (52), the other end is connected to the needle cooling cavity (7), the outer side wall of the second water inlet pipe (61) and the inner side wall of the needle rod (3) form a water return cavity (62), one end of the water return cavity (62) is connected to the water return tank (51), the side wall of the second water inlet pipe (61) is provided with a through hole (63), the second water inlet pipe (61) is connected to the water return cavity (62) through the through hole (63), and the second water inlet pipe (61) is provided with the internal temperature measuring ring (10) between the second water inlet pipe (61) and the ablation needle (4).

6. A microwave ablation needle as defined in claim 5, wherein: The through hole (63) is located on the side of the second water inlet pipe (61) close to the ablation needle (4), the through hole (63) is provided with a plurality of through holes and is arranged along the axis direction of the second water inlet pipe (61).

7. The microwave ablation needle of claim 1, wherein: The needle rod (3) and the ablation needle (4) are provided with the external temperature measuring ring (11).

8. The microwave ablation needle of claim 1, wherein: The cable (8) comprises an outer conductor (81), a dielectric layer (82) and an inner core (83) from outside to inside, one end of the dielectric layer (82) and the inner core (83) extends to the outside of the outer conductor (81) and extends to the ablation needle (4), and the outer side of the dielectric layer (82) is sealingly connected with the ablation needle (4).

9. A microwave ablation needle as defined in claim 8, wherein: The outer side of the outer conductor (81) is further fixedly connected with a choke coil (84) in a cylindrical structure.

10. A microwave ablation needle as defined in claim 9, wherein: The axis lines of the outer conductor (81), the dielectric layer (82), the inner core (83), the choke coil (84) and the ablation needle (4) are coincident.

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