CN113081250A - Water-cooling microwave ablation needle with external water cavity - Google Patents

Abstract

The invention discloses a water-cooling microwave ablation needle with an external water cavity, wherein one end of an ablation needle tube is connected with a microwave radiation puncture head, the other end of the ablation needle tube is inserted into a handle, the end part of the ablation needle tube in the handle is connected with a switching sleeve, one end of a coaxial cable penetrates through the switching sleeve to extend into the ablation needle tube and contact with the microwave radiation puncture head, the other end of the coaxial cable extends out of the switching sleeve to be connected with a radio frequency connector arranged in the handle, the ablation needle tube comprises an inner tube and an outer tube which are sleeved inside and outside, one end of the ablation needle tube close to the microwave radiation puncture head is communicated with the inner tube and the outer tube, and forms a loop, the external cooling water cavity is connected with an inner layer pipe penetration opening positioned on the adapter sleeve through a water inlet rubber pipe, and is communicated with the inner layer pipe, and a water outlet on the switching sleeve is connected with a drain pipe arranged on the outer wall of the handle through a water outlet rubber pipe. The invention adopts the double-layer tube ablation needle tube, has better cooling effect, smoother heat exchange process in the cooling water backflow process and quicker cooling.

Description

Water-cooling microwave ablation needle with external water cavity

Technical Field

The invention relates to a microwave ablation needle, in particular to a water-cooling microwave ablation needle with an external water cavity.

Background

The microwave thermal ablation therapy is widely applied to clinical tumor treatment nowadays due to the advantages of minimal invasion, small toxic and side effects, wide adaptation and the like, and is particularly applied to common tumors such as liver cancer, lung cancer, kidney cancer and the like. The water cavity for storing cooling water in the microwave ablation needle clinically used at present is often arranged inside the ablation needle.

The traditional microwave ablation needle is characterized in that a capillary tube is inserted into an ablation needle tube to guide cooling water to flow into the front end of the needle body, the cooling water flows back in a pipeline to cool the rod wall of the ablation needle tube, the cooling water flows back into a built-in water cavity, the built-in water cavity cannot observe the flow rate and the water yield of the cooling water visually, and the cooling effect of the needle body cannot be evaluated visually. In addition, the cooling water of the traditional ablation needle flows in through the capillary tube to reach the front end of the needle tube to realize cooling, and the capillary tube is easy to bend and block in the manufacturing process, so that the cooling effect is not ideal.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a water-cooling microwave ablation needle with an external water cavity.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides an external type water-cooling microwave ablation needle in water cavity, includes microwaveradiation puncture head 1, meltsneedle tubing 3,handle 4 and externalcooling water cavity 5, the one end of meltingneedle tubing 3 is connected with microwaveradiation puncture head 1, and the other end of meltingneedle tubing 3 inserts inhandle 4, and the end connection of meltingneedle tubing 3 inhandle 4 hasadapter sleeve 8, and the one end of coaxial cable 7 is passedadapter sleeve 8 and is stretched into in meltingneedle tubing 3 and contact with microwaveradiation puncture head 1, and the other end of coaxial cable 7 stretches outadapter sleeve 8 and arranges theradio frequency joint 9 inhandle 4 and meet, it includesinner tube 302 andouter pipe 301 that is the setting of inside and outside suit to meltneedle tubing 3, and melts the near microwaveradiation puncture head 1's ofneedle tubing 3 one end, communicates with each other betweeninner tube 302 and theouter pipe 301 to form the return circuit, externalcooling water cavity 5 is connected the inner tube penetration mouth that is locatedadapter sleeve 8 throughincome water hose 13, and is communicated with theinner layer pipe 302, and awater outlet 803 on theadapter sleeve 8 is connected with awater outlet pipe 6 arranged on the outer wall of thehandle 4 through a wateroutlet rubber pipe 12.

Further, aninsulating medium sleeve 2 is arranged at the joint of theablation needle tube 3 and the microwaveradiation puncture head 1. One end of the coaxial cable 7 is welded with theradio frequency connector 9, the other end of the coaxial cable 7 is stripped with a certain length of outer skin, a conductor inside the coaxial cable 7 is welded with the microwaveradiation puncture head 1, and then aninsulating medium sleeve 2 is sleeved on the connecting position.

Further, theablation needle tube 3 is a double-layer stainless steel tube, and the coaxial cable 7 is accommodated between anouter layer tube 301 positioned at the outer part and aninner layer tube 302 positioned at the inner part.

Further, the inner diameter of theouter tube 301 is larger than the sum of the outer diameter of theinner tube 302 and the outer diameter of the coaxial cable 7, so as to leave a gap for the backflow of the cooling water.

Furthermore, cooling water flows in from the externalcooling water cavity 5 to theinner pipe 302 through the water inletrubber pipe 13 and the innerpipe penetration port 801 on theadapter sleeve 8, flows into theouter pipe 301 through one end of theablation needle tube 3 close to the microwaveradiation puncture head 1, and is discharged to thedrain pipe 6 through thewater outlet 803 on theadapter sleeve 8 and the wateroutlet rubber pipe 12. The cooling water flows in from theinner layer pipe 302, and flows back through theouter layer pipe 301 due to the separation of theinsulating medium sleeve 2 at one end close to the microwaveradiation puncture head 1, and simultaneously, the temperature of the coaxial cable 7 and the temperature of the outer wall of theablation needle tube 3 are reduced in a heat exchange mode, so that the cooling effect is realized. The coaxial cable 7 is accommodated in theablation needle tube 3, the inner diameter of theablation needle tube 3 is properly larger than the outer diameter of the coaxial cable 7, a water cavity is formed in the hollow part of the ablation needle tube, water in the needle tube is automatically pushed to theadapter sleeve 8 under the pressure of the circulating water pump, and meanwhile heat is taken away by cooling water and theablation needle tube 3 through heat exchange, so that the needle tube is cooled. Theinner layer pipe 302 is externally connected with a waterinlet rubber pipe 13, the water inletrubber pipe 13 passes through an external circulating water pump, cooling water is pumped into theinner layer pipe 302 through the water pump and blocked by theinsulating medium sleeve 2 at the front end, and the gap of theouter layer pipe 301 flows back.

Further, the externalcooling water cavity 5 and thedrain pipe 6 are arranged outside thehandle 4 and used for observing the flow speed and flow rate of the returned cooling water and ensuring smooth circulation of the cooling water.

The water-cooling microwave ablation needle with the external water cavity further comprises atemperature sensor 10, wherein thetemperature sensor 10 is arranged on the outer wall of the joint of theablation needle tube 3 and theadapter sleeve 8; thetemperature sensor 10 is connected with a display screen on the outer wall of thehandle 4 through a temperaturemeasurement connecting wire 11; thetemperature sensor 10 is a 10k omega thermistor, and thetemperature sensor 10 can effectively monitor the temperature of the outer wall of theablation needle tube 3 in the ablation process and indirectly refer to the temperature of the microwaveradiation puncture head 1.

Further, acable penetration hole 802 is further formed in theadapter sleeve 8, and the coaxial cable 7 penetrates into theablation needle tube 3 from thecable penetration hole 802.

Further, the innerpipe penetration hole 801 of theadapter sleeve 8 is butted with theinner pipe 302.

Further, the microwaveradiation puncture head 1 has a needle head in any one of a conical shape, a triangular pyramid shape and an obtuse circle shape, and is made of copper.

Further, the material ofinsulating medium cover 2 is polytetrafluoroethylene, the material ofdrain pipe 6 is PVC,adapter sleeve 8 is epoxy to adopt 3D printing technique to make for the ablation needle tubing and the coaxial cable of encapsulation front end, the cooling water of control backward flow simultaneously flows into external water cavity.

Compared with the prior art, the invention has the following beneficial effects:

the double-layer ablation needle tube is adopted, the cooling effect is better than that of the traditional single-layer ablation needle tube in which a plurality of cooling capillary tubes are inserted, the heat exchange process in the cooling water backflow process is smoother, and the cooling is quicker; compared with the traditional built-in water cavity, the external cooling water cavity has the advantages that the flow speed and the water yield of the return cooling water can be visually observed and controlled; the temperature sensor adopts a thermistor and is attached to the joint of the ablation needle tube and the adapter sleeve, so that the rod temperature monitoring is more accurate.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a cross-sectional view of an ablation needle cannula of the present invention;

FIG. 4 is a cross-sectional view of an ablation needle cannula of the present invention;

FIG. 5 is a cross-sectional view of an adapter sleeve according to the present invention;

wherein: 1-microwave radiation puncture head, 2-insulating medium sleeve, 3-ablation needle tube, 301-outer layer tube, 302-inner layer tube, 4-handle, 5-external cooling water cavity, 6-drain tube, 7-coaxial cable, 8-adapter sleeve, 801-inner layer tube penetration port, 802-cable penetration port, 803-water outlet, 9-radio frequency connector, 10-temperature sensor, 11-temperature measurement connecting line, 12-water outlet rubber tube and 13-water inlet rubber tube.

Detailed Description

The present invention will be further described with reference to the following examples.

As shown in fig. 1-5, a water-cooling microwave ablation needle with an external water cavity comprises a microwaveradiation puncture head 1, anablation needle tube 3, ahandle 4 and an externalcooling water cavity 5, wherein one end of theablation needle tube 3 is connected with the microwaveradiation puncture head 1, the other end of theablation needle tube 3 is inserted into thehandle 4, the end of theablation needle tube 3 in thehandle 4 is connected with aswitching sleeve 8, one end of a coaxial cable 7 penetrates through theswitching sleeve 8 and extends into theablation needle tube 3 and contacts with the microwaveradiation puncture head 1, the other end of the coaxial cable 7 extends out of theswitching sleeve 8 to be connected with aradio frequency connector 9 arranged in thehandle 4, theablation needle tube 3 comprises aninner tube 302 and anouter tube 301 which are sleeved inside and outside, one end of theablation needle tube 3 close to the microwaveradiation puncture head 1 is communicated with theinner tube 302 and theouter tube 301 to form a loop, the externalcooling water cavity 5 is connected with an innertube penetration port 801 arranged on the switchingsleeve 8 through awater inlet hose 13, and is communicated with theinner layer pipe 302, and awater outlet 803 on theadapter sleeve 8 is connected with awater outlet pipe 6 arranged on the outer wall of thehandle 4 through a wateroutlet rubber pipe 12.

And aninsulating medium sleeve 2 is arranged at the joint of theablation needle tube 3 and the microwaveradiation puncture head 1. One end of the coaxial cable 7 is welded with theradio frequency connector 9, the other end of the coaxial cable 7 is stripped with a certain length of outer skin, a conductor inside the coaxial cable 7 is welded with the microwaveradiation puncture head 1, and then aninsulating medium sleeve 2 is sleeved on the connecting position.

Theablation needle tube 3 is a double-layer stainless steel tube, a coaxial cable 7 is accommodated between anouter layer tube 301 positioned outside and aninner layer tube 302 positioned inside, the outer diameter of the coaxial cable 7 is smaller than the gap between theouter layer tube 301 and theinner layer tube 302, and the inner diameter of theouter layer tube 301 is larger than the sum of the outer diameter of theinner layer tube 302 and the outer diameter of the coaxial cable 7, so that a gap for cooling water to flow back is reserved.

The specific flow direction of the cooling water in the invention is as follows: cooling water flows in from the externalcooling water cavity 5 through the water inletrubber tube 13 and the inner layertube penetration port 801 on theadapter sleeve 8 to theinner layer tube 302, flows into theouter layer tube 301 through one end of theablation needle tube 3 close to the microwaveradiation puncture head 1, and is discharged through thewater outlet 803 on theadapter sleeve 8, the wateroutlet rubber tube 12 to thewater discharge tube 6. The cooling water flows in from theinner layer pipe 302, and flows back through theouter layer pipe 301 due to the separation of theinsulating medium sleeve 2 at one end close to the microwaveradiation puncture head 1, and simultaneously, the temperature of the coaxial cable 7 and the temperature of the outer wall of theablation needle tube 3 are reduced in a heat exchange mode, so that the cooling effect is realized. The coaxial cable 7 is accommodated in theablation needle tube 3, the inner diameter of theablation needle tube 3 is properly larger than the outer diameter of the coaxial cable 7, a water cavity is formed in the hollow part of the ablation needle tube, water in the needle tube is automatically pushed to theadapter sleeve 8 under the pressure of the circulating water pump, and meanwhile heat is taken away by cooling water and theablation needle tube 3 through heat exchange, so that the needle tube is cooled. Theinner layer pipe 302 is externally connected with a waterinlet rubber pipe 13, the water inletrubber pipe 13 passes through an external circulating water pump, cooling water is pumped into theinner layer pipe 302 through the water pump and blocked by theinsulating medium sleeve 2 at the front end, and the gap of theouter layer pipe 301 flows back. The externalcooling water cavity 5 and thedrain pipe 6 are arranged outside thehandle 4 and used for observing the flow speed and flow of the returned cooling water and ensuring smooth circulation of the cooling water.

As a preferred scheme, a water-cooling microwave ablation needle with an external water cavity further comprises atemperature sensor 10, wherein thetemperature sensor 10 is arranged on the outer wall of the joint of theablation needle tube 3 and theadapter sleeve 8, and thetemperature sensor 10 is connected with a display screen on the outer wall of thehandle 4 through a temperaturemeasurement connecting line 11. Thetemperature sensor 10 is a 10k omega thermistor, and thetemperature sensor 10 can effectively monitor the temperature of the outer wall of theablation needle tube 3 in the ablation process and indirectly refer to the temperature of the microwaveradiation puncture head 1.

Specifically, theadapter sleeve 8 is further provided with acable penetration hole 802, and the coaxial cable 7 penetrates into theablation needle tube 3 from thecable penetration hole 802; the innerpipe penetration port 801 of theadapter sleeve 8 is butted with theinner pipe 302.

Preferably, the shape of the needle of the microwaveradiation puncture head 1 is any one of a cone, a triangular pyramid and an obtuse circle, and the material is copper; the material ofinsulating medium cover 2 is polytetrafluoroethylene, the material ofdrain pipe 6 is PVC,adapter sleeve 8's material is epoxy to adopt 3D printing technique to make, be used for the ablation needle tubing and the coaxial cable of encapsulation front end, the cooling water inflow external water cavity of the simultaneous control backward flow.

Preferably, thehandle 4 wraps theradio frequency connector 9 and theadapter sleeve 8, and thedrain pipe 6 and the temperature measurement connecting wire 14 are fixed, so that sealing is realized, and the use is convenient.

The ablation needle of the invention firstly welds the microwave radiation puncture head with the coaxial cable inner conductor; then the insulating medium is sleeved on the coaxial cable and fixed at the microwave radiation puncture head for blocking cooling water and simultaneously is a gap for microwave radiation; the coaxial cable passes through the space between the outer layer tube and the inner layer tube of the ablation needle tube, and simultaneously the inner layer tube of the ablation needle tube is ensured to extend out of an inner layertube penetration port 801 reserved on the adapter sleeve; then welding a radio frequency joint at the rear end of the coaxial cable; the temperature sensor is adhered to the joint of the ablation needle tube and the adapter sleeve; after assembly, the rear end of theablation needle tube 3 is arranged in thehandle 4 to realize sealing.

The double-layer ablation needle tube comprises ahandle 4 and anablation needle tube 3, theablation needle tube 3 arranged on the wall of the double-layer tube has a good cooling effect and is simple to assemble, the defect that a capillary tube adopted by a traditional ablation needle is easy to bend and block is overcome, and the externalcooling water cavity 5 has the advantages of flowing speed of return cooling water and visual observation and control of water yield compared with a traditional internal water cavity; thetemperature sensor 10 adopts a thermistor and is attached to the joint of theablation needle tube 3 and theadapter sleeve 8, so that the reference temperature of the ablation part can be indirectly monitored, and the rod temperature monitoring is more accurate.

Compared with the traditional mode that a plurality of cooling capillaries are inserted into a single-layer ablation needle tube, the mode that the ablation needle is cooled through the double-layer ablation needle tube can effectively avoid the problems that the inserted capillaries are easy to bend and block and the cooling effect is poor due to small water flow, and the double-layer ablation needle tube has larger inner-layer tube aperture, harder texture and no risk of bending and blocking. The heat exchange process of the cooling water backflow process is smoother, the cooling is quicker, and the cooling effect is better. Compared with the traditional built-in water cavity, the external water cavity has the advantages of flowing speed of the return cooling water, visual observation and control of water yield.

Compared with the traditional water cooling mode of inserting a capillary tube into the ablation needle tube, the water cooling mode of the ablation needle tube has the advantages that the risk of blockage of the water-cooled capillary tube due to bending of the needle rod is avoided, cooling water circulation is more stable, contact with the rod wall of the ablation needle tube is better, and better cooling effect can be realized; in addition, the cooling water is directly externally connected with the externalcooling water cavity 5 through the adapter sleeve, so that the water cooling conditions including flow velocity, water yield and the like in the ablation process can be visually observed, and the safety and stability of microwave ablation are ensured; the temperature sensor is arranged at the joint of the coaxial cable and the adapter sleeve, so that the temperature of the needle rod (the ablation needle tube 3) in the ablation process can be effectively monitored, and the skin of a patient is prevented from being burnt due to overhigh temperature.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (10)

Translated fromChinese

1.一种水腔外置型水冷微波消融针，其特征在于：包括微波辐射穿刺头(1)、消融针管(3)、手柄(4)和外置冷却水水腔(5)，所述消融针管(3)的一端连接有微波辐射穿刺头(1)，消融针管(3)的另一端插入手柄(4)内，在手柄(4)内的消融针管(3)端部连接有转接套管(8)，同轴电缆(7)的一端穿过转接套管(8)伸入消融针管(3)内并与微波辐射穿刺头(1)相接触，同轴电缆(7)的另一端伸出于转接套管(8)与置于手柄(4)内的射频接头(9)相接，所述消融针管(3)包括呈内外套装设置的内层管(302)和外层管(301)，且消融针管(3)近微波辐射穿刺头(1)的一端，内层管(302)和外层管(301)之间相通，并形成回路，所述外置冷却水水腔(5)通过入水胶管(13)连接位于转接套管(8)上的内层管穿入口(801)，并与内层管(302)连通，所述转接套管(8)上的出水口(803)通过出水胶管(12)连接置于手柄(4)外壁上的排水管(6)。1. A water-cavity external water-cooled microwave ablation needle, characterized in that it comprises a microwave radiation puncture head (1), an ablation needle tube (3), a handle (4) and an external cooling water cavity (5). One end of the needle tube (3) is connected with a microwave radiation puncture head (1), the other end of the ablation needle tube (3) is inserted into the handle (4), and an end of the ablation needle tube (3) in the handle (4) is connected with an adapter sleeve Tube (8), one end of the coaxial cable (7) extends into the ablation needle tube (3) through the adapter sleeve (8) and contacts with the microwave radiation puncture head (1), and the other end of the coaxial cable (7) One end protrudes from the adapter sleeve (8) and is connected to the radio frequency connector (9) placed in the handle (4). A tube (301), and one end of the ablation needle tube (3) near the microwave radiation puncture head (1), the inner tube (302) and the outer tube (301) communicate with each other to form a loop, the external cooling water The cavity (5) is connected to the inner pipe penetration port (801) on the adapter sleeve (8) through the water inlet rubber pipe (13), and is communicated with the inner pipe (302), and the adapter sleeve (8) is connected to the inner pipe (801). The water outlet (803) of the water outlet (803) is connected to the drain pipe (6) placed on the outer wall of the handle (4) through the water outlet hose (12).2.根据权利要求1所述的水腔外置型水冷微波消融针，其特征在于，所述消融针管(3)与微波辐射穿刺头(1)的连接处设置有绝缘介质套(2)。2 . The water-cooled microwave ablation needle with external water cavity according to claim 1 , wherein an insulating medium sleeve ( 2 ) is provided at the connection between the ablation needle tube ( 3 ) and the microwave radiation puncture head ( 1 ). 3 .3.根据权利要求1所述的水腔外置型水冷微波消融针，其特征在于，所述消融针管(3)为双层不锈钢管，位于外部的外层管(301)和位于内部的内层管(302)之间容纳同轴电缆(7)。3. The water-cooled microwave ablation needle with external water cavity according to claim 1, wherein the ablation needle tube (3) is a double-layer stainless steel tube, an outer tube (301) located on the outside and an inner layer tube located on the inside A coaxial cable (7) is accommodated between the tubes (302).4.根据权利要求3所述的水腔外置型水冷微波消融针，其特征在于，所述外层管(301)的内径大于内层管(302)的外径与同轴电缆(7)的外径之和。The water-cooled microwave ablation needle of claim 3, wherein the inner diameter of the outer tube (301) is larger than the outer diameter of the inner tube (302) and the diameter of the coaxial cable (7). Sum of outer diameters.5.根据权利要求3所述的水腔外置型水冷微波消融针，其特征在于，冷却水自外置冷却水水腔(5)经入水胶管(13)、转接套管(8)上的内层管穿入口(801)至内层管(302)流进，经消融针管(3)近微波辐射穿刺头(1)的一端流入外层管(301)，经转接套管(8)上的出水口(803)、出水胶管(12)至排水管(6)排出。5. The water-cavity external water-cooled microwave ablation needle according to claim 3, characterized in that the cooling water flows from the external cooling water cavity (5) through the water inlet hose (13) and the tube on the adapter sleeve (8). The inner tube passes through the inlet (801) to the inner tube (302), and flows into the outer tube (301) through the end of the ablation needle tube (3) near the microwave radiation puncture head (1), and passes through the adapter sleeve (8) The water outlet (803) and the water outlet hose (12) on the upper part are discharged to the drain pipe (6).6.根据权利要求1所述的水腔外置型水冷微波消融针，其特征在于，还包括温度传感器(10)，所述温度传感器(10)设置于消融针管(3)和转接套管(8)连接处外壁，所述温度传感器(10)通过测温连接线(11)连接位于手柄(4)外壁上的显示屏，所述温度传感器(10)为热敏电阻。6 . The water-cooled microwave ablation needle with external water cavity according to claim 1 , further comprising a temperature sensor ( 10 ), wherein the temperature sensor ( 10 ) is arranged on the ablation needle tube ( 3 ) and the adapter sleeve ( 6 . 8) The outer wall of the connection, the temperature sensor (10) is connected to the display screen located on the outer wall of the handle (4) through a temperature measuring connection line (11), and the temperature sensor (10) is a thermistor.7.根据权利要求1所述的水腔外置型水冷微波消融针，其特征在于，所述转接套管(8)上还设置有电缆穿入口(802)，所述同轴电缆(7)自电缆穿入口(802)穿入消融针管(3)内。7. The water-cavity external water-cooled microwave ablation needle according to claim 1, characterized in that, the adapter sleeve (8) is further provided with a cable penetration port (802), and the coaxial cable (7) The ablation needle tube (3) is passed through the cable penetration port (802).8.根据权利要求1所述的水腔外置型水冷微波消融针，其特征在于，所述转接套管(8)上的内层管穿入口(801)与内层管(302)对接。8. The water-cavity external water-cooled microwave ablation needle according to claim 1, wherein the inner tube penetration port (801) on the adapter sleeve (8) is butted with the inner tube (302).9.根据权利要求1所述的水腔外置型水冷微波消融针，其特征在于，所述微波辐射穿刺头(1)的针头形状为圆锥形、三棱锥形、钝圆形中的任意一种，材质为铜。9 . The water-cooled microwave ablation needle with external water cavity according to claim 1 , wherein the shape of the needle of the microwave radiation puncture head ( 1 ) is any one of a cone, a triangular pyramid, and a blunt circle. 10 . , the material is copper.10.根据权利要求1所述的水腔外置型水冷微波消融针，其特征在于，所述绝缘介质套(2)的材质为聚四氟乙烯，所述排水管(6)的材质为PVC，所述转接套管(8)的材质为环氧树脂。10. The water-cavity external water-cooled microwave ablation needle according to claim 1, wherein the insulating medium sleeve (2) is made of polytetrafluoroethylene, the drain pipe (6) is made of PVC, The material of the adapter sleeve (8) is epoxy resin.

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