Umbrella-shaped electrode for liver tumor treatment

Abstract

The utility model provides an umbrella-shaped electrode for liver tumor treatment, which comprises an electrode base and an electrode arm assembly, the electrode base is of a tubular structure, the bottom of the electrode arm assembly is fixed in the electrode base in an insulating manner, the electrode arm assembly comprises at least four upward extending electrode arms and at least four downward extending electrode arms, and the electrode arms are fixed on the electrode base. The upper extending electrode arms and the lower extending electrode arms are arranged on the circumference equally-divided angles of a circle with the center line of the electrode base as the vertical line in a staggered mode, the upper extending electrode arms and the lower extending electrode arms are both in an arc shape, and the arc radius of the upper extending electrode arms is larger than that of the lower extending electrode arms. The double-layer arc-shaped electrode arm assemblies with different sizes are designed, so that the shape of a liver tumor which can be ablated is closer to a sphere, tissue blood vessels can be avoided, and the success rate of an operation is improved.

Description

Technical Field

[0001] This utility model relates to the field of radiofrequency ablation technology for tumors, and in particular to an umbrella-shaped electrode for the treatment of liver tumors. Background Technology

[0002] Liver tumors are generally spherical in shape. If the ablation foci are nearly spherical, they can cover the tumor as much as possible, reducing the chance of postoperative tumor recurrence. The size of the ablation foci should also be slightly larger than the maximum diameter of the tumor. The ablation range should include the tumor and 0.5-1.0 cm of surrounding liver tissue to obtain the ablation margin; otherwise, tumor residue is likely to occur. Therefore, the size and shape of the ablation foci under different RFA conditions remains a crucial and fundamental issue in the clinical application of RFA for liver tumors. For a specific radiofrequency ablation instrument, many factors influence the morphology and size of the ablation foci, mainly including the following two aspects: 1. The magnitude of the radiofrequency ablation output energy, including treatment time and output power, which are closely related to the number of electrodes and the length of the exposed electrodes; 2. Factors such as blood supply and metabolism of biological tissues, including the thermal conductivity, electrical conductivity, and density of the tissue.

[0003] Currently, most liver tumor patients in China are diagnosed when the tumors are large. Therefore, clinicians and patients urgently need electrode devices for the effective ablation of tumors larger than 5 cm. Chinese utility model patent CN202044344U discloses a tower-type multi-layer probe radiofrequency ablation electrode device for liver tumor treatment. The device describes a probe that extends from a cannula into a multi-layer tower shape, with 2 to 5 layers. The tower shape can be either upright or inverted, and the distributed shape of each layer of probes is umbrella-shaped when extended. However, the electrode device disclosed in this patent suffers from problems. Its multi-layered needles cause excessive tissue damage during puncture, making it difficult to avoid blood vessels in organs with limited volume, easily leading to bleeding. Furthermore, proximity to blood vessels can cause heat to be carried away by the blood flow, affecting heat accumulation, causing the heat-affected zone to shrink, resulting in insufficient tumor ablation and surgical failure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an umbrella-shaped electrode for the treatment of liver tumors, wherein the electrode arm assembly is designed as a double-layered arc of different sizes, so that the shape of the liver tumor that can be ablated is closer to that of a sphere, thereby avoiding tissue blood vessels and improving the success rate of surgery.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] An umbrella-shaped electrode for treating liver tumors includes an electrode base and an electrode arm assembly. The electrode base is a tubular structure, and the bottom of the electrode arm assembly is insulated and fixed inside the electrode base. The electrode arm assembly includes at least four upper electrode arms and at least four lower electrode arms. The upper and lower electrode arms are staggered on the circumference of a circle perpendicular to the center line of the electrode base, with each angle equally divided. Both the upper and lower electrode arms are arc-shaped, and the arc radius of the upper electrode arms is larger than that of the lower electrode arms.

[0007] Furthermore, it also includes an electrode arm fixing plate, which is slidably disposed within the electrode base, and the lower end of the electrode arm assembly is fixed on the electrode arm fixing plate.

[0008] Furthermore, the number of electrode arm fixing plates is one, and the electrode arm fixing plate has inner ring mounting holes and outer ring mounting holes arranged at staggered equal angles. The upper electrode arm is installed in the inner ring mounting hole, and the lower electrode arm is installed in the outer ring mounting hole.

[0009] Furthermore, it also includes a sleeve base, which is a tubular structure, and the electrode base is fixed to the top of the sleeve base.

[0010] Furthermore, both the upper electrode arm and the lower electrode arm are semi-circular arc-shaped, and the radius of the upper electrode arm is 1.5 to 2.5 times the radius of the lower electrode arm.

[0011] Furthermore, on the horizontal line, the length of the upper electrode arm is 0.7 to 1.2 times the length of the lower electrode arm.

[0012] Furthermore, the upper electrode arm is in the shape of a quarter arc, the lower electrode arm is in the shape of a semi-circular arc, and the radius of the upper electrode arm is 0.7 to 1.2 times the diameter of the lower electrode arm.

[0013] Furthermore, the upper electrode arm is 1 / 4 arc-shaped, the lower electrode arm is 3 / 4 arc-shaped, and the radius of the upper electrode arm is 0.7 to 1.2 times the diameter of the lower electrode arm.

[0014] Furthermore, it also includes a pressure sensor mounted on the head of the electrode arm assembly.

[0015] Furthermore, it also includes a temperature sensor, which is mounted on the head of the electrode arm assembly.

[0016] The beneficial effects of this invention are as follows: by designing the electrode arm assembly into a double-layered arc shape with an upper electrode arm and a lower electrode arm of different sizes, the shape of the liver tumor that can be ablated is closer to that of a sphere, which can avoid tissue blood vessels and improve the success rate of the operation. Attached Figure Description

[0017] Figure 1 This is a specific embodiment of the umbrella-shaped electrode for treating liver tumors according to the present invention;

[0018] Figure 2 This is an embodiment of the present utility model. Figure 1 Schematic diagram of the tumor ablation range corresponding to the umbrella-shaped electrode;

[0019] Figure 3 This is a specific embodiment of the umbrella-shaped electrode for treating liver tumors according to the present invention;

[0020] Figure 4 This is an embodiment of the present utility model. Figure 3 Schematic diagram of the tumor ablation range corresponding to the umbrella-shaped electrode;

[0021] Figure 5 This is a specific embodiment of the umbrella-shaped electrode for treating liver tumors according to the present invention;

[0022] Figure 6 This is an embodiment of the present utility model. Figure 5 A schematic diagram of the simulated tumor ablation range corresponding to the umbrella-shaped electrode;

[0023] Figure 7 This is a top view of the electrode arm fixing plate according to an embodiment of the present invention.

[0024] Label Explanation:

[0025] 1. Electrode base; 2. Upper electrode arm; 3. Lower electrode arm; 4. Electrode arm fixing plate; 5. Sleeve base;

[0026] 41. Inner ring mounting hole; 42. Outer ring mounting hole. Detailed Implementation

[0027] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0028] Please refer to Figures 1 to 7 The embodiments provided by this utility model are as follows:

[0029] An umbrella-shaped electrode for treating liver tumors includes an electrode base 1 and an electrode arm assembly. The electrode base 1 is a tubular structure, and the bottom of the electrode arm assembly is insulated and fixed within the electrode base 1. The electrode arm assembly includes at least four upward electrode arms 2 and at least four downward electrode arms 3. The upward electrode arms 2 and downward electrode arms 3 are staggered on the circumference of a circle perpendicular to the center line of the electrode base 1, with each arm being arc-shaped. The radius of the arc of the upward electrode arm 2 is larger than that of the downward electrode arm 3. During operation, voltage is applied to the upward electrode arms 2, downward electrode arms 3, and electrode base 1. The staggered arrangement of the upward and downward electrode arms 2 and 3 ensures that the liver tumor cells that the electrode arm assembly can ablate are nearly spherical, thereby avoiding tissue blood vessels and improving the success rate of the surgery.

[0030] Furthermore, the upper electrode arm 2 and the lower electrode arm 3 are solid or hollow, and the diameters of the different electrode arms are the same or different. The voltage applied during operation is the same or different, and the selection is based on the shape of the liver tumor, which can meet the needs of more types of spherical liver tumor cells.

[0031] Further, see Figure 7 As shown, it also includes an electrode arm fixing plate 4, which is slidably disposed within the electrode base 1. The lower end of the electrode arm assembly is fixed to the electrode arm fixing plate 4. The electrode arm fixing plate 4 is made of a high-temperature resistant and insulating ceramic material, such as PA66. The electrode base 1 itself is conductive, and an insulating coating or insulating tube, such as a Teflon coating or a PTFE tube, is added to the outer surface of the electrode base 1 to make its outer surface electrically insulating and self-lubricating, with the aim of reducing resistance during tissue insertion.

[0032] Furthermore, the upper electrode arm 2 and the lower electrode arm 3 are made of copper-plated nickel-titanium alloy with shape memory function. Before the operation, the upper electrode arm 2 and the lower electrode arm 3 are retracted into the electrode base 1. During the operation, after the electrode base 1 is inserted into the human tissue, the electrode arm fixing plate 4 slides forward relative to the electrode base 1 until the upper electrode arm 2 and the lower electrode arm 3 are unfolded into an umbrella shape. When the electrode is working, a certain voltage is applied to the upper electrode arm 2, the lower electrode arm 3 and the electrode base 1 to ablate liver tumor cells. After the tumor cells are eliminated, the electrode arm fixing plate 4 is pulled towards the hand to retract the upper electrode arm 2 and the lower electrode arm 3 into the electrode base 1, and the needle is withdrawn. Voltage is continued to be applied during the needle withdrawal process to suppress needle tract bleeding until the electrode base 1 is withdrawn outside the human body and no voltage is applied, and the operation is completed.

[0033] Furthermore, there is one electrode arm fixing plate 4. The electrode arm fixing plate 4 has inner ring mounting holes 41 and outer ring mounting holes 42 arranged at staggered angles. The upper electrode arm 2 is installed in the inner ring mounting hole 41, and the lower electrode arm 3 is installed in the outer ring mounting hole 42. On the one hand, the upper electrode arm 2 and the lower electrode arm 3 are evenly distributed around the circumference. On the other hand, the diameter of the electrode arm fixing plate 4 and the electrode base 1 is minimized to reduce the pain of the patient during surgery.

[0034] Furthermore, it also includes a cannula base 5, which is a tubular structure, and the electrode base 1 is fixed to the top of the cannula base 5. The cannula base 5 is used to facilitate gripping during surgery.

[0035] Furthermore, it also includes a pressure sensor, which is mounted on the head of the electrode arm assembly to detect the pressure in the tumor cell ablation area.

[0036] Furthermore, it also includes a temperature sensor, which is installed at the head of the electrode arm assembly to detect the temperature of the tumor cell ablation area.

[0037] The following is an example of the specific structure of the umbrella-shaped electrode for liver tumor treatment described in this application:

[0038] For a specific embodiment, see Figure 1 As shown, both the upper electrode arm 2 and the lower electrode arm 3 are semi-circular arc-shaped. The radius of the upper electrode arm 2 is 1.5 to 2.5 times the radius of the lower electrode arm 3. The shape of the liver tumor cells that can be ablated by applying the same voltage and frequency to each of the upper electrode arm 2, lower electrode arm 3, and electrode base 1 is as shown. Figure 2 As shown, it is similar to a hemispherical shape. Of course, each of the upper electrode arm 2, lower electrode arm 3 and electrode base 1 can be subjected to different voltages and frequencies.

[0039] For a specific embodiment, see Figure 3 and Figure 5 As shown, on the horizontal line, the length of the upper electrode arm 2 is 0.7 to 1.2 times the length of the lower electrode arm 3. The shape of the liver tumor cells that can be ablated by applying the same voltage and frequency to each of the upper electrode arm 2, lower electrode arm 3, and electrode base 1 is as follows. Figure 4 and Figure 6 As shown, it is similar to a sphere. Of course, each of the upper electrode arm 2, lower electrode arm 3 and electrode base 1 can be subjected to different voltages and frequencies.

[0040] For a specific embodiment, see Figure 3As shown, the upper electrode arm 2 is a quarter-circular arc, and the lower electrode arm 3 is a semi-circular arc. The radius of the upper electrode arm 2 is 0.7 to 1.2 times the diameter of the lower electrode arm 3. The shape of the liver tumor cells that can be ablated by applying the same voltage and frequency to each of the upper electrode arm 2, lower electrode arm 3, and electrode base 1 is as shown. Figure 4 As shown, it is similar to a sphere. Of course, each of the upper electrode arm 2, lower electrode arm 3 and electrode base 1 can be subjected to different voltages and frequencies.

[0041] For a specific embodiment, see Figure 5 As shown, the upper electrode arm 2 is a 1 / 4 arc shape, and the lower electrode arm 3 is a 3 / 4 arc shape. The radius of the upper electrode arm 2 is 0.7 to 1.2 times the diameter of the lower electrode arm 3. The shape of the liver tumor cells that can be ablated by applying the same voltage and frequency to each of the upper electrode arm 2, lower electrode arm 3, and electrode base 1 is as shown. Figure 6 As shown, it is similar to a sphere. Of course, each of the upper electrode arm 2, lower electrode arm 3 and electrode base 1 can be subjected to different voltages and frequencies.

[0042] In summary, the umbrella-shaped electrode for liver tumor treatment provided by this utility model designs the electrode arm assembly as a double-layered arc shape with different sizes, including a set of upper electrode arms 2 and a set of lower electrode arms 3. The combination of the upper electrode arms 2, the lower electrode arms 3 and the electrode base 1 allows the liver tumor that can be ablated to be closer to a spherical shape, thus avoiding tissue blood vessels and improving the success rate of the operation.

[0043] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An umbrella-shaped electrode for treating liver tumors, characterized in that, The electrode assembly includes an electrode base (1) and an electrode arm assembly. The electrode base (1) is a tubular structure. The bottom of the electrode arm assembly is insulated and fixed inside the electrode base (1). The electrode arm assembly includes at least four upward electrode arms (2) and at least four downward electrode arms (3). The upward electrode arms (2) and downward electrode arms (3) are arranged alternately on the circumference of a circle perpendicular to the center line of the electrode base (1). Both the upward electrode arms (2) and the downward electrode arms (3) are arc-shaped. The arc radius of the upward electrode arm (2) is larger than that of the downward electrode arm (3).

2. The umbrella-shaped electrode for treating liver tumors according to claim 1, characterized in that, It also includes an electrode arm fixing plate (4), which is slidably disposed in the electrode base (1), and the lower end of the electrode arm assembly is fixed on the electrode arm fixing plate (4).

3. The umbrella-shaped electrode for treating liver tumors according to claim 2, characterized in that, The number of electrode arm fixing plates (4) is one. The electrode arm fixing plate (4) is provided with an inner ring mounting hole (41) and an outer ring mounting hole (42) arranged at staggered angles. The upper electrode arm (2) is installed in the inner ring mounting hole (41), and the lower electrode arm (3) is installed in the outer ring mounting hole (42).

4. The umbrella-shaped electrode for treating liver tumors according to claim 1, characterized in that, It also includes a sleeve base (5), which is a tubular structure, and the electrode base (1) is fixed on the top of the sleeve base (5).

5. The umbrella-shaped electrode for treating liver tumors according to claim 1, characterized in that, Both the upper electrode arm (2) and the lower electrode arm (3) are semi-circular arcs, and the radius of the upper electrode arm (2) is 1.5 to 2.5 times the radius of the lower electrode arm (3).

6. The umbrella-shaped electrode for treating liver tumors according to claim 1, characterized in that, On the horizontal line, the length of the upper electrode arm (2) is 0.7 to 1.2 times the length of the lower electrode arm (3).

7. The umbrella-shaped electrode for treating liver tumors according to claim 6, characterized in that, The upper electrode arm (2) is 1 / 4 arc-shaped, and the lower electrode arm (3) is semi-circular arc-shaped. The radius of the upper electrode arm (2) is 0.7 to 1.2 times the diameter of the lower electrode arm (3).

8. The umbrella-shaped electrode for treating liver tumors according to claim 6, characterized in that, The upper electrode arm (2) is 1 / 4 arc-shaped, and the lower electrode arm (3) is 3 / 4 arc-shaped. The radius of the upper electrode arm (2) is 0.7 to 1.2 times the diameter of the lower electrode arm (3).

9. The umbrella-shaped electrode for treating liver tumors according to claim 1, characterized in that, It also includes a pressure sensor mounted on the head of the electrode arm assembly.

10. The umbrella-shaped electrode for treating liver tumors according to claim 1, characterized in that, It also includes a temperature sensor mounted on the head of the electrode arm assembly.

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