A temperature-measuring ablation needle with magnetic positioning navigation

Abstract

A magnetic positioning navigation and temperature measurement ablation needle, the ablation needle comprising an ablation needle, a sensor module, an ablation needle body and a handle. The ablation needle comprises an ablation needle tip at the front end and a sensor inside the needle tip, the sensor comprising a magnetic positioning sensor and a thermocouple sensor, the thermocouple sensor being welded together through two temperature measurement signal lines as a temperature measurement point, and the portion of one of the two temperature measurement signal lines close to the temperature measurement point being wound into a magnetic positioning sensor coil. Compared with the prior art, the present invention combines the temperature measurement sensor and the magnetic positioning sensor coil into one by opening a cylindrical hole at the bottom of the needle tip, and fixes it to the ablation needle tip through a heat-conducting potting glue, thereby ensuring both the temperature measurement accuracy and the magnetic positioning accuracy. In addition, the complexity of the overall layout of the cables inside the needle body is reduced, and the production difficulty and production cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an ablation needle with magnetic positioning, navigation and temperature measurement. Background Art

[0002] In traditional radiofrequency ablation surgery, the process of puncturing the lesion with radiofrequency ablation requires doctors to rely on their experience. The accuracy depends on the doctor's experience and varies greatly. In addition, some lesions cannot be seen clearly with the naked eye under ultrasound and are difficult to puncture. Therefore, radiofrequency ablation has begun to use navigation systems more and more to achieve more accurate puncture. When using a navigation system, it is usually necessary to add an optical marker ball or a magnetic induction sensor to the tail of the ablation needle, so that the optical navigation system or the magnetic navigation system can track the tail of the ablation needle and infer the position of the ablation needle tip according to a rigid body or some deformation algorithm. However, due to the uncontrollable deformation of the needle shaft of the ablation needle, the accuracy is not very high.

[0003] To improve the success rate of radiofrequency ablation surgery, the lesion must be penetrated accurately first, and then the lesion must be ablated thoroughly. Accurate penetration of the lesion requires the use of a navigation system. Since magnetic navigation will not be affected by intraoperative optical occlusion, magnetic navigation is commonly used in the ablation field. If magnetic navigation is to be accurate, the magnetic positioning sensor coil must be as close to the needle tip as possible. In order to thoroughly ablate the lesion, it is necessary to at least accurately measure the temperature of the needle tip. Accurate temperature measurement of the needle tip also requires the temperature sensor to be as close to the needle tip as possible. Due to the small space of the ablation needle tip itself, the wires of the magnetic induction coil and the wires of the thermal sensor must be electrically insulated and isolated, so it is difficult to put both of them on the needle tip at the same time. There are also ablation electrode wires and water injection needle cooling pipelines, which make the internal pipeline layout of the needle tip very complicated and difficult to integrate. Summary of the invention

[0004] In view of the above defects in the prior art, the present invention provides a magnetic positioning navigation temperature measurement ablation needle as follows:

[0005] The technical solution of the present invention is achieved in this way:

[0006] A kind of ablation needle with magnetic positioning, navigation and temperature measurement, the ablation needle comprises an ablation needle head, a sensor module, an ablation needle body and a handle, the ablation needle head comprises an ablation needle tip at the front end and a bottom cylindrical part, the ablation needle body comprises an ablation needle outer tube and an ablation needle inner tube welded to the ablation needle head, the sensor module is a magnetic positioning and thermocouple two-in-one sensor, the thermocouple of the sensor module is welded together by two temperature measurement signal lines as a temperature measurement point, the other ends of the two temperature measurement signal lines are connected to an external plug at the rear end of the handle, one of the two temperature measurement signal lines close to the temperature measurement point is wound into a magnetic positioning sensor coil, an ablation electrode welding point is arranged on the ablation needle body, the ablation electrode welding point is connected to the external plug through an ablation needle wire, and the ablation needle inner tube, the ablation needle outer tube and the handle are cooperated with a water cooling system.

[0007] Preferably, a half-open cylindrical hole is arranged in the middle of the bottom of the ablation needle tip, the axis of the cylindrical hole coincides with the center of the bottom of the ablation needle tip, the thermocouple and the magnetic positioning sensor coil are arranged at the front end of the cylindrical hole, the axis of the magnetic positioning sensor coil coincides with the axis of the cylindrical hole, and the cylindrical hole is filled with thermal conductive potting glue.

[0008] Preferably, the external plug includes an ablation host plug and a magnetic navigation host plug, the two temperature measurement signal lines are respectively connected to the ablation host plug, the two temperature measurement signal lines are respectively connected to the magnetic navigation host plug through DC isolation capacitors, and the ablation needle wire is connected to the ablation host plug.

[0009] Preferably, the axis of the magnetic positioning sensor coil coincides with the axis of the ablation needle.

[0010] Preferably, the water cooling system includes a water inlet pipe, a water outlet pipe, a water inlet cavity and a water outlet cavity, and the water inlet pipe, water outlet pipe, water inlet cavity and water outlet cavity are arranged inside the handle, the water inlet pipe and the inner tube of the ablation needle are connected to the water inlet cavity, the water outlet pipe and the outer tube of the ablation needle are connected to the water outlet cavity, and a needle tube end closer is arranged on the outside of the handle.

[0011] Preferably, a first closing piece and a second closing piece are provided in the handle, the first closing piece and the front end area of ​​the handle are the water outlet cavity, and the area between the first closing piece and the second closing piece is the water inlet cavity.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The magnetic positioning navigation and temperature measurement ablation needle of the present invention integrates the temperature measurement sensor and the magnetic positioning sensor coil into the ablation needle tip by opening a cylindrical hole at the bottom of the needle tip, so that the temperature measurement accuracy and positioning accuracy can reach a very high level. Secondly, the signal line of the magnetic navigation and the signal line of the temperature measurement can be shared. For the internal layout of the ablation needle tip, in order to ensure the rigidity, the aperture of the internal cylindrical hole should not be too large (generally the aperture is less than 1mm). By reducing the use of two signal lines, the complexity of the overall layout of the internal pipeline of the needle tip is reduced, and the production difficulty and production cost are reduced. Since the positioning navigation work and the temperature measurement work are in different working periods during the operation, the data transmission between the two will not affect each other through the DC isolation capacitor, and the temperature measurement and magnetic navigation positioning can also be accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the ablation needle with magnetic positioning navigation and temperature measurement of the present invention;

[0015] Figure 2 is a schematic structural diagram of the ablation needle of the present invention;

[0016] Figure 3 This is a schematic diagram of the signal cable connection of the magnetic positioning navigation temperature measurement ablation needle of the present invention.

[0017] In the figure: ablation needle 100, ablation needle tip 110, cylindrical hole 111, bottom cylindrical part 120, thermocouple 210, temperature measurement signal line 220, magnetic positioning sensor coil 230, ablation needle body 300, ablation needle outer tube 310, ablation needle inner tube 320, ablation electrode welding point 330, ablation needle wire 340, handle 400, first sealing piece 410, second sealing piece 420, ablation host plug 510, magnetic navigation host plug 520, water inlet pipe 710, water outlet pipe 720, water inlet cavity 730, water outlet cavity 740, needle tube end sealer 800, insulating sheath 900. DETAILED DESCRIPTION

[0018] The present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] like Figures 1 to 3As shown, an ablation needle with magnetic positioning navigation and temperature measurement, the ablation needle includes an ablation needle head 100, a sensor module, an ablation needle body 300 and a handle 400, the ablation needle head 100 includes an ablation needle tip 110 at the front end and a bottom cylindrical part 120, the ablation needle body 300 includes an ablation needle outer tube 310 and an ablation needle inner tube 320 welded to the ablation needle head 100, the sensor module is a magnetic positioning and thermocouple two-in-one sensor, the thermocouple 210 of the sensor module is welded together by two temperature measurement signal lines 220 as a temperature measurement point, and the other end of the two temperature measurement signal lines 220 An external plug is connected to the rear end of the handle 400, and the part of one of the two temperature measurement signal lines 220 close to the temperature measurement point is wound into a magnetic positioning sensor coil 230, so that the magnetic positioning sensor coil 230 is not far from the ablation needle tip 110, and the deformation of the ablation needle tip 110 during puncture has little effect on the navigation positioning position. An ablation electrode welding point 330 is arranged on the ablation needle body 300, and the ablation electrode welding point 330 is connected to the external plug through an ablation needle wire 340, and the ablation needle inner tube 310, the ablation needle outer tube 320 and the handle 400 are cooperated with a water cooling system. A half-open cylindrical hole 111 is set in the middle of the bottom of the ablation needle tip 110, and the axis of the cylindrical hole 111 coincides with the center of the bottom of the ablation needle tip 110. The thermocouple 210 and the magnetic positioning sensor coil 230 are set at the front end of the cylindrical hole 111, and the axis of the magnetic positioning sensor coil 230 coincides with the axis of the cylindrical hole 111. The cylindrical hole 111 is poured with thermal conductive potting glue, and the magnetic positioning sensor coil 230 is ensured to be at the axis of the cylindrical hole 111 through tooling, and then the thermal conductive potting glue is poured in for curing, so that the thermal conductive potting glue fills the bottom cylindrical hole 111. Since the position of the magnetic positioning sensor coil 230 needs to be fixed relative to the ablation needle tip 110, in order to prevent the position calibration information of the magnetic positioning sensor coil 230 from drifting after leaving the factory and causing inaccurate positioning, at the same time, the temperature measurement point of the thermocouple 210 also needs to be kept close to the RF energy output point of the ablation needle tip 110. Therefore, the thermal conductive potting glue can not only conduct heat, but also fix the magnetic positioning sensor coil 230, and at the same time, it can also isolate the water intrusion caused by the water injection path. The external plug includes an ablation host plug 510 and a magnetic navigation host plug 520. The two temperature measurement signal lines 220 are respectively connected to the ablation host plug 510. The two temperature measurement signal lines 220 are respectively connected to the magnetic navigation host plug 520 through DC isolation capacitors. The ablation needle wire 340 is connected to the ablation host plug 510. During magnetic navigation positioning, the temperature measurement signal line 220 is equivalent to the positioning data line that sends the positioning signal to the magnetic navigation host plug 520. The DC isolation capacitor can filter out the DC signal on the temperature measurement signal line 220. When temperature measurement is required, the magnetic navigation function can be turned off, and the temperature of the ablation needle tip 110 collected by the temperature measurement point of the thermocouple 210 is sent to the ablation host plug 510 through the temperature measurement signal line 220, and the external host can display the measured temperature.The axis of the magnetic positioning sensor coil 230 coincides with the axis of the ablation needle. The water cooling system includes a water inlet pipe 710, a water outlet pipe 720, a water inlet cavity 730 and a water outlet cavity 740, wherein the water inlet pipe 710, the water outlet pipe 720, the water inlet cavity 730 and the water outlet cavity 740 are arranged inside the handle 400, the water inlet pipe 710 and the ablation needle inner tube 320 are connected to the water inlet cavity 730, the water outlet pipe 720 and the ablation needle outer tube 310 are connected to the water outlet cavity 740, and a needle end sealer 800 is arranged outside the handle 400. The handle 400 is provided with a first sealing piece 410 and a second sealing piece 420. The first sealing piece 410 and the front end area of ​​the handle 400 are a water outlet cavity 740, and the area between the first sealing piece 410 and the second sealing piece 420 is a water inlet cavity 730. In order to ensure that the RF energy output is concentrated on the ablation needle tip 110, the ablation needle outer tube 310 is provided with an insulating sheath 900.

[0020] Example

[0021] The ablation needle is made of non-magnetic stainless steel material with a cylindrical bottom and a diameter of 1.5mm. The ablation needle tip is conical, and the height from the ablation needle tip to the bottom of the cylinder is 1.6cm. A cylindrical hole with a half-open bottom and a diameter of 0.8mm is set inside the ablation needle tip. The length of the hole is 1cm. A magnetic positioning sensor coil with a diameter of 0.5mm and a length of 8mm is wound with a copper enameled wire of a metal material conductor. One end of the enameled wire is welded to another metal material conductor nickel-copper alloy wire. The magnetic positioning sensor coil is placed in the cylindrical hole inside the ablation needle tip. The magnetic positioning sensor coil is placed at the center axis position of the cylindrical hole through the glue filling tooling device, and then the thermal conductive potting glue is poured in for curing. Since the magnetic positioning sensor coil needs to be fixed relative to the ablation needle tip, the magnetic positioning sensor coil position calibration information should not drift after leaving the factory, resulting in inaccurate positioning. At the same time, the thermocouple temperature measurement point also needs to be kept close to the RF energy output point of the ablation needle tip. Therefore, the thermal conductive potting glue can not only conduct heat, but also fix the magnetic positioning sensor coil, and at the same time, it can also isolate the water intrusion caused by the water injection path from affecting the positioning accuracy and temperature measurement accuracy.

[0022] The metal ring outside the thermal conductive potting glue at the bottom of the ablation needle tip is welded together with the inner wall of the ablation needle outer tube with an outer diameter of 1.5 mm. The two temperature measurement signal wires inside the ablation needle tip are led out to the needle tube end sealer through the inner tube cavity of the ablation needle inner tube. The outer side of the ablation needle outer tube is tightly connected to the front opening of the needle tube end sealer, the outer side of the ablation needle inner tube is tightly connected to the opening of the first sealing piece, and the water outlet pipe is also tightly connected to another opening of the first sealing piece. In this way, the gap between the outer side of the ablation needle inner tube and the inner side of the outer needle tube is connected to the water outlet pipe as a water outlet channel. A wire is welded at the end of the ablation needle outer tube, which is connected to the ablation host plug as an ablation electrode wire. The second sealing piece is 5mm away from the end of the first sealing piece. The second sealing piece is tightly connected to the water outlet pipe through the water outlet opening, and is tightly connected to the water injection pipe through the water injection pipe opening. A rubber hose is put on the outside of the inner tube of the ablation needle and connected to the water injection pipe. The two temperature measurement signal lines in the inner tube cavity of the ablation needle lead out the signal cable and the ablation needle wire through the signal opening on the second sealing piece. The composite output is output to the ablation host plug, and the cable is sealed with sealant after it is led out. At the end of the needle tube, the two temperature measurement signal lines are connected in parallel and then connected in series with a 0.1uF monolithic capacitor to the magnetic navigation host plug, so that the electromagnetically induced AC signal will not affect the thermocouple DC signal. The capacitor is fixed at the end of the ablation needle. The length of the insulating sheath is set so that the length from the ablation needle tip to the exposed part of the insulating sheath is 2cm.

[0023] Based on the structure of the present invention, it can be known that the ablation needle with magnetic positioning, navigation and temperature measurement of the present invention opens a cylindrical hole at the bottom of the needle tip, and uses the magnetic navigation coil as one pole of the thermocouple to participate in the temperature measurement, which is equivalent to integrating the temperature measurement sensor and the magnetic positioning sensor coil into one into the ablation needle tip. In this way, the signal line of the magnetic navigation and the signal line of the temperature measurement can be shared. Regarding the internal layout of the ablation needle tip, in order to ensure the rigidity, the aperture of the internal cylindrical hole should not be too large (generally the aperture is less than 1 mm). By reducing the use of separately arranged magnetic positioning sensor signal lines, the complexity of the overall layout of the internal pipelines of the needle tip is reduced, and the production difficulty and production cost are reduced. Since the positioning and navigation work and the temperature measurement work are in different periods during the operation, the data transmission between the two will not affect each other, and accurate temperature measurement and magnetic navigation positioning can also be achieved.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical principles of the invention, several improvements and modifications can be made. For example, instead of using DC blocking capacitors, signal relays can be used to isolate and switch the temperature measurement signal and the magnetic navigation signal. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A magnetic positioning navigation temperature measurement ablation needle, characterized in that: The ablation needle comprises an ablation needle head, a sensor module, an ablation needle body and a handle, the ablation needle head comprises an ablation needle tip at the front end and a bottom cylindrical part, the ablation needle body comprises an ablation needle outer tube and an ablation needle inner tube welded to the ablation needle head, the sensor module is a magnetic positioning and thermocouple two-in-one sensor, the thermocouple of the sensor module is welded together through two temperature measurement signal lines as a temperature measurement point, the other ends of the two temperature measurement signal lines are connected to an external plug at the rear end of the handle, one of the two temperature measurement signal lines close to the temperature measurement point is wound into a magnetic positioning sensor coil, an ablation electrode welding point is arranged on the ablation needle body, the ablation electrode welding point is connected to the external plug through an ablation needle wire, and the ablation needle inner tube, the ablation needle outer tube and the handle are cooperatively provided with a water cooling system; A half-open cylindrical hole is set in the middle of the bottom of the ablation needle tip, the axis of the cylindrical hole coincides with the center of the bottom of the ablation needle tip, the thermocouple and the magnetic positioning sensor coil are set at the front end of the cylindrical hole, the axis of the magnetic positioning sensor coil coincides with the axis of the cylindrical hole, and the cylindrical hole is filled with thermal conductive potting glue.

2. The ablation needle with magnetic positioning navigation and temperature measurement as claimed in claim 1, characterized in that: The external plug includes an ablation host plug and a magnetic navigation host plug. The two temperature measurement signal lines are respectively connected to the ablation host plug. The two temperature measurement signal lines are respectively connected to the magnetic navigation host plug through DC isolation capacitors. The ablation needle wire is connected to the ablation host plug.

3. The ablation needle with magnetic positioning navigation and temperature measurement as claimed in claim 2, characterized in that: The axis of the magnetic positioning sensor coil coincides with the axis of the ablation needle.

4. The ablation needle with magnetic positioning navigation and temperature measurement as claimed in claim 2, characterized in that: The water cooling system includes a water inlet pipe, a water outlet pipe, a water inlet cavity and a water outlet cavity. The water inlet pipe, the water outlet pipe, the water inlet cavity and the water outlet cavity are arranged inside the handle. The water inlet pipe and the inner tube of the ablation needle are connected to the water inlet cavity. The water outlet pipe and the outer tube of the ablation needle are connected to the water outlet cavity. A needle tube end closer is arranged on the outside of the handle.

5. The ablation needle with magnetic positioning navigation and temperature measurement as claimed in claim 4, characterized in that: A first closing piece and a second closing piece are arranged in the handle, the first closing piece and the front end area of ​​the handle are the water outlet cavity, and the area between the first closing piece and the second closing piece is the water inlet cavity.

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