Tumor ablation needle

Abstract

The invention provides a tumor ablation needle which comprises an ablation cannula, one end of the ablation cannula is communicated with an ablation cannula, a telescopic shaft is slidably connected into the ablation cannula, the free end of the ablation cannula is rotatably connected with a threaded adjusting knob in threaded connection with the telescopic shaft, and the end, close to the ablation cannula, of the telescopic shaft is connected with a limiting pipe. The end, away from the ablation cannula, of the telescopic shaft is connected with an adjusting shaft, and a plurality of movable sliding holes penetrate through the telescopic shaft and the adjusting shaft. An electrode guide wire is arranged in the movable sliding hole, a heat insulation sleeve corresponding to the electrode guide wire is slidably connected in the movable sliding hole, a plurality of adjusting sliding holes communicating with the movable sliding hole in a one-to-one correspondence mode are inwards formed in the periphery of the adjusting shaft, and the adjusting sliding holes are slidably connected with a threaded connecting shaft used for driving the heat insulation sleeve to slide; and the head end of the electrode guide wire penetrates through the limiting tube and is connected with an ablation wire extending into the ablation cannula. The ablation needle can be adjusted according to the difference of tumor individuals, and the tumor ablation effect and safety are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices and relates to a tumor ablation needle. Background Art

[0002] A tumor ablation needle is a minimally invasive medical device for local treatment of solid tumors. It destroys tumor cells by directly delivering energy (such as radiofrequency, microwave or cryo) into the tumor tissue. With the development of modern medical technology, tumor ablation, as a non-surgical treatment method, has been widely used in clinical practice. It can not only effectively treat various types of tumors, but also reduce the trauma to the patient's body and shorten the recovery time.

[0003] Initially, radiofrequency ablation (RFA) technology was mainly used in tumor ablation needles. This technology relies on the heat generated by high-frequency alternating current to heat and destroy tumor tissue. With the progress of technology, new technologies such as microwave ablation (MWA) and cryoablation have also been introduced into clinical practice. Microwave ablation uses microwave energy to generate higher temperatures, thus achieving more extensive tissue ablation in a shorter time; while cryoablation destroys the structure of tumor cells by forming ice crystals at extremely low temperatures. These technologies have their own advantages and all aim to improve the effectiveness and safety of tumor treatment.

[0004] However, in practical applications, the existing ablation needle technology still has certain limitations. Especially when determining the optimal puncture depth and angle, challenges are faced because the human anatomical structure is complex and diverse, and the location, size and shape of tumors vary, making it difficult to accurately concentrate energy in the tumor area. This situation leads to incomplete tumor ablation in some cases, and the remaining tumor cells may continue to grow and spread. On the other hand, excessive pursuit of the ablation range to ensure complete removal of the tumor may damage normal tissues, especially when important blood vessels, nerves and other vital organs are distributed around the tumor, which is likely to cause unnecessary complications. Summary of the Invention

[0005] The purpose of the present invention is to provide a tumor ablation needle that can adjust the ablation needle according to the individual differences of tumors, effectively improving the effectiveness and safety of tumor ablation.

[0006] To solve the above technical problems, the present invention provides a tumor ablation needle, which includes an ablation sleeve. One end of the ablation sleeve is connected to an ablation cannula with a smaller inner diameter. A telescopic shaft that cannot rotate relative to it is slidably connected inside the ablation sleeve. A threaded adjustment knob is rotatably connected to the free end of the ablation sleeve. An external thread that is threadedly connected to the threaded adjustment knob is provided outside the telescopic shaft. One end of the telescopic shaft close to the ablation cannula is connected to a limit tube that cooperates with the ablation cannula. The other end of the telescopic shaft away from the ablation cannula is connected to an adjustment shaft arranged along its length direction. A plurality of movable sliding holes are opened through the telescopic shaft and the adjustment shaft along their length directions.

[0007] An electrode guide wire is provided in each movable sliding hole. A heat-insulating and insulating sleeve with a shorter length and sleeving the corresponding electrode guide wire is slidably connected in each movable sliding hole. A plurality of adjustment sliding holes corresponding to and communicating with the movable sliding holes one by one are inwardly opened on the outer periphery of the adjustment shaft. Each heat-insulating and insulating sleeve is provided with a threaded connection shaft extending out of the corresponding adjustment sliding hole. Each threaded connection shaft is threadedly connected with a clamping threaded sleeve outside the corresponding adjustment sliding hole. The head end of each electrode guide wire passes through the limit tube and is connected to an ablation wire extending into the ablation cannula. The head end of each ablation wire can extend out of the ablation cannula and bend outward into a J shape. The free end of the adjustment shaft is connected to an adaptive adjustment section. A power connection terminal electrically connected to each electrode guide wire is provided at the free end of the adaptive adjustment section.

[0008] By adopting the above technical solution, during a tumor ablation operation, under medical imaging, first use a puncture needle to puncture to the tumor location, then insert the ablation cannula into the puncture needle and make its tip penetrate out of the puncture needle. Rotate the threaded adjustment knob to drive the telescopic shaft to slide towards the head end relative to the ablation sleeve, push the ablation wire to extend out from the head end of the ablation cannula, and then bend it into a J shape and pierce into the tumor. Observe under medical imaging and adjust the length of each ablation wire. When adjustment is needed, rotate the clamping threaded sleeve to loosen it, then the heat-insulating and insulating sleeve can be pushed to slide along the movable sliding hole by the clamping threaded sleeve, and the ablation wire can be pushed and pulled through the electrode guide wire to adjust the length of all ablation wires extending out, so that the ablation wires evenly cover the inside of the tumor. Finally, connect the power supply through the power connection terminal to make the ablation wire heat up and generate a high temperature of 100°C - 110°C to kill tumor cells, achieving the purpose of precise tumor ablation.

[0009] The present invention is further configured such that a plurality of limit strips arranged along the length direction are provided on the inner wall of the ablation sleeve. Limit sliding grooves corresponding to and slidably connected with the limit strips one by one are opened on the outer wall of the telescopic shaft.

[0010] The present invention is further configured such that the threaded adjustment knob is disposed at the end of the ablation cannula. A connecting ring sleeving the ablation cannula is provided at one end of the threaded adjustment knob close to the ablation cannula. An annular card slot is formed in the inner wall of the connecting ring, and an annular protrusion cooperating with the annular card slot is provided on the outer wall of the ablation cannula.

[0011] The present invention is further configured such that the inner diameter of the limiting tube is equal to the inner diameter of the ablation cannula.

[0012] The present invention is further configured such that each heat insulation and insulation sleeve is made of ceramic material.

[0013] The present invention is further configured such that a plurality of wire bending holes corresponding to and communicating with the movable sliding holes one by one are formed through the adaptive adjustment section, and the inner diameter of each wire bending hole is larger than the inner diameter of the movable sliding hole.

[0014] The present invention is further configured such that the ablation cannula, the ablation cannula, the telescopic shaft, the limiting tube, the adjustment shaft and the adaptive adjustment section are all made of polypropylene material.

[0015] The present invention is further configured such that the ablation cannula has a three-layer structure, including a polypropylene outer layer located on the outer layer, an aerogel layer located in the middle layer, and a polypropylene inner layer located on the inner layer.

[0016] The present invention is further configured such that the thickness of the aerogel layer is 0.5 mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] First, the present invention uses the method of threading the ablation wire in a J shape into the tumor, so that it can be fully distributed in the tumor cells, and uses the method of high-temperature heating to quickly kill the tumor cells, so as to achieve the purpose of precise ablation of the tumor;

[0019] Second, the present invention can individually adjust the extension length of each ablation wire through the clamping threaded sleeve. In the case of tumors with different positions, sizes and shapes, the ablation wires can still be evenly distributed inside the tumor. While fully ablating the tumor cells, it can effectively avoid damaging normal tissues, and can effectively improve the effect and safety of tumor ablation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a partial cross-sectional view for showing the internal structure of the present invention;

[0022] Figure 3 For showing the connection between the ablation cannula and the threaded adjustment knob

[0023] Figure 4 For displaying the telescopic shaft, the adjustment shaft and the electrode guide wire inside the adaptive adjustment section;

[0024] Figure 5 It is a partial cross-sectional view for showing the internal structures of the telescopic shaft, the adjustment shaft and the adaptive adjustment section;

[0025] Figure 6 It is a partial cross-sectional view for showing the three-layer structure of the ablation cannula.

[0026] Wherein, 1 is the ablation cannula; 11 is the ablation cannula; 111 is the polypropylene outer layer; 112 is the aerogel layer; 113 is the polypropylene inner layer; 12 is the limiting strip; 13 is the annular protrusion; 2 is the telescopic shaft; 21 is the limiting sliding groove; 22 is the limiting tube; 3 is the threaded adjustment knob; 31 is the connecting ring; 32 is the annular clamping groove; 33 is the adjustment shaft; 34 is the movable sliding hole; 35 is the adjustment sliding hole; 36 is the adaptive adjustment section; 37 is the guide wire bending hole; 4 is the electrode guide wire; 41 is the heat-insulating and insulating sleeve; 42 is the threaded connecting shaft; 43 is the clamping threaded sleeve; 44 is the ablation wire; 5 is the power connection terminal. Detailed implementation manners

[0027] The following further elaborates on a tumor ablation needle proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0028] Embodiment, referring to Figure 1-6 , a tumor ablation needle, including an ablation cannula 1, one end of the ablation cannula 1 is communicated with an ablation cannula 11 with a smaller inner diameter, a telescopic shaft 2 is slidably connected inside the ablation cannula 1, four limiting strips 12 are arranged on the inner wall of the ablation cannula 1 along its length direction, and four limiting sliding grooves 21 corresponding to the limiting strips 12 are formed on the outer wall of the telescopic shaft 2 for sliding connection, so that the telescopic shaft 2 cannot rotate relative to the ablation cannula 1. One end of the ablation cannula 1 far from the ablation cannula 11 is rotatably connected with a threaded adjustment knob 3. A connecting ring 31 sleeving the ablation cannula 1 is arranged at one end of the threaded adjustment knob 3 close to the ablation cannula 1. An annular clamping groove 32 is formed on the inner wall of the connecting ring 31, and an annular protrusion 13 cooperating with the annular clamping groove 32 is arranged on the outer wall of the ablation cannula 1. An external thread threadedly connected with the threaded adjustment knob 3 is arranged outside the telescopic shaft 2, and the telescopic shaft 2 can be driven to expand and contract relative to the ablation cannula 1 by rotating the threaded adjustment knob 3.

[0029] One end of the telescopic shaft 2 close to the ablation cannula 11 is connected with a limiting tube 22 that cooperates with the ablation cannula 11. The inner diameter of the limiting tube 22 is equal to the inner diameter of the ablation cannula 11. The end of the telescopic shaft 2 far from the ablation cannula 11 is connected with an adjustment shaft 33 arranged along its length direction. Ten circumferentially distributed movable sliding holes 34 are opened through the telescopic shaft 2 and the adjustment shaft 33 along their length directions. A wire electrode 4 is arranged in each movable sliding hole 34. A shorter length of heat-insulating and insulating sleeve 41 that sheathes the corresponding wire electrode 4 is slidably connected in each movable sliding hole 34. Each heat-insulating and insulating sleeve 41 is made of ceramic material. The heat-insulating and insulating sleeve 41 can not only play an insulating role but also isolate the heat generated by the wire electrode 4.

[0030] Ten adjustment sliding holes 35 corresponding to and communicating with the movable sliding holes 34 are inwardly opened on the outer periphery of the adjustment shaft 33. Each heat-insulating and insulating sleeve 41 is externally provided with a threaded connection shaft 42 extending out of the corresponding adjustment sliding hole 35. A clamping threaded sleeve 43 is threadedly connected outside each adjustment sliding hole 35 on each threaded connection shaft 42. Rotating the clamping threaded sleeve 43 to clamp the outer wall of the adjustment shaft 33 plays a role in restricting the heat-insulating and insulating sleeve 41. The head end of each wire electrode 4 passes through the limiting tube 22 and is connected with an ablation wire 44 extending into the ablation cannula 11. The head end of each ablation wire 44 can extend out of the ablation cannula 11 and bend outward into a J shape. The free end of the adjustment shaft 33 is connected with an adaptive adjustment section 36. Ten wire bending holes 37 corresponding to and communicating with the movable sliding holes 34 and allowing the wire electrode 4 to bend inside are opened through the adaptive adjustment section 36. The inner diameter of each wire bending hole 37 is larger than the inner diameter of the movable sliding hole 34. When the wire electrode 4 reciprocally expands and contracts along with the heat-insulating and insulating sleeve 41, it can adaptively bend in the wire bending hole 37. A power connection terminal 5 is arranged at the free end of the adaptive adjustment section 36. The tail end of each wire electrode 4 passes through the adaptive adjustment section 36 and is electrically connected with the power connection terminal 5.

[0031] To avoid electric leakage, the ablation sleeve 1, the ablation cannula 11, the telescopic shaft 2, the limiting tube 22, the adjustment shaft 33 and the adaptive adjustment section 36 are all made of polypropylene material. At the same time, the ablation cannula 11 has a three-layer structure, including a polypropylene outer layer 111 located on the outer layer, an aerogel layer 112 located in the middle layer, and a polypropylene inner layer 113 located on the inner layer. The thickness of the aerogel layer 112 is 0.5 mm. The aerogel has good heat-insulating performance. The introduction of the aerogel can effectively increase the heat-insulating performance of the ablation cannula 11 and prevent the ablation wire 44 from conducting heat to damage normal tissues.

[0032] Usage: When performing tumor ablation surgery, under medical imaging, first use a puncture needle to puncture to the tumor location, then insert the ablation cannula 11 into the puncture needle, pass through and make its tip penetrate out of the puncture needle, rotate the threaded adjustment knob 3, drive the telescopic shaft 2 to slide towards the head end relative to the ablation sleeve 1, push the ablation wire 44 out of the head end of the ablation cannula 11, then bend it into a J shape and pierce it into the tumor. Observe under medical imaging and adjust the length of each ablation wire 44. When adjustment is needed, rotate the clamping threaded sleeve 43 to loosen it, then the heat-insulating and insulating sleeve 41 can be pushed along the movable sliding hole 34 by the clamping threaded sleeve 43, and then the ablation wire 44 is pushed and pulled by the electrode guide wire 4 to adjust the length of all ablation wires 44 extending out, so that the ablation wires 44 evenly cover the inside of the tumor. Finally, connect the power supply through the power connection terminal 5 to make the ablation wire 44 generate heat and produce a high temperature of 100°C - 110°C to kill tumor cells, achieving the purpose of precise tumor ablation.

[0033] It should also be supplemented and explained that all "settings" and similar descriptive words in this application (especially in the specification) express that there is a connection relationship between two structures, but the specific means of connection between the two is not overly limited, and it is usually a conventional connection means, that is, it should be understood that this means is the prior art and does not need to be elaborated too much. For example, "n is provided on m" only expresses that there is an n structure on the m structure, and whether the two are connected by welding, riveting, adhesive bonding or integrally formed is within the protection scope of this application; another example, "y is rotatably provided on x" only expresses that y can rotate relative to x, and as for whether the two are rotatably connected by a bearing, or y directly passes through x and is rotatably connected to x, or other achievable ways, they are all within the protection scope of this application.

[0034] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure are within the protection scope of the claims.

Claims

1. A tumor ablation needle, comprising an ablation sleeve (1), characterized in that: One end of the ablation sleeve (1) is connected to an ablation tube (11) with a smaller inner diameter, a telescopic shaft (2) which cannot rotate relative to the ablation sleeve (1) is slidably connected inside the ablation sleeve (1), a threaded adjustment knob (3) is rotatably connected to the free end of the ablation sleeve (1), an external thread threadedly connected to the threaded adjustment knob (3) is arranged on the outside of the telescopic shaft (2), a limiting tube (22) matched with the ablation tube (11) is connected to the end of the telescopic shaft (2) close to the ablation tube (11), an adjustment shaft (33) arranged along its length direction is connected to the end of the telescopic shaft (2) away from the ablation tube (11), and a plurality of movable sliding holes (34) are arranged along its length direction through the telescopic shaft (2) and the adjustment shaft (33); An electrode guide wire (4) is arranged in each movable sliding hole (34), and a heat-insulating sleeve (41) of shorter length and corresponding to the electrode guide wire (4) is slidably connected in each movable sliding hole (34). A plurality of adjusting sliding holes (35) connected to the movable sliding holes (34) are arranged inwardly on the outer circumference of the adjusting shaft (33), and each heat-insulating sleeve (41) is provided with a threaded connecting shaft (42) extending out of the corresponding adjusting sliding hole (35). Each threaded connecting shaft (42) is connected to the corresponding adjusting sliding hole ( 35) are all threadedly connected to a clamping threaded sleeve (43), the head end of each electrode guide wire (4) passes through the limiting tube (22) and is connected to an ablation wire (44) extending into the ablation tube (11), and the head end of each ablation wire (44) can extend out of the ablation tube (11) and bend outward in a J shape, the free end of the adjustment shaft (33) is connected to an adaptive adjustment section (36), and the free end of the adaptive adjustment section (36) is provided with an electrical terminal (5) electrically connected to each electrode guide wire (4).

2. A tumor ablation needle according to claim 1, characterized in that: The inner wall of the ablation sleeve (1) is provided with a plurality of limit strips (12) arranged along its length direction, and the outer wall of the telescopic shaft (2) is provided with limit sliding grooves (21) which are slidably connected to the limit strips (12) in a one-to-one correspondence.

3. The tumor ablation needle according to claim 1, characterized in that: The threaded adjustment knob (3) is arranged at the end of the ablation sleeve (1), and a connecting ring (31) which covers the ablation sleeve (1) is arranged at one end of the threaded adjustment knob (3) close to the ablation sleeve (1), and an annular groove (32) is provided on the inner wall of the connecting ring (31), and an annular protrusion (13) which cooperates with the annular groove (32) is provided on the outer wall of the ablation sleeve (1).

4. The tumor ablation needle according to claim 1, characterized in that: The inner diameter of the limiting tube (22) is equal to the inner diameter of the ablation cannula (11).

5. The tumor ablation needle according to claim 1, characterized in that: Each heat-insulating sleeve (41) is made of ceramic material.

6. The tumor ablation needle according to claim 1, characterized in that: A plurality of guide wire bending holes (37) are provided through the adaptive adjustment section (36) and are connected to the movable sliding holes (34) in a one-to-one correspondence. The inner diameter of each guide wire bending hole (37) is larger than the inner diameter of the movable sliding hole (34).

7. A tumor ablation needle according to any one of claims 1 to 6, characterized in that: The ablation sleeve (1), the ablation cannula (11), the telescopic shaft (2), the position limiting tube (22), the adjustment shaft (33) and the adaptive adjustment section (36) are all made of polypropylene.

8. The tumor ablation needle according to claim 7, characterized in that: The ablation cannula (11) has a three-layer structure, comprising a polypropylene outer layer (111) located at the outer layer, an aerogel layer (112) located at the middle layer, and a polypropylene inner layer (113) located at the inner layer.

9. The tumor ablation needle according to claim 8, characterized in that: The thickness of the aerogel layer (112) is 0.5 mm.

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