Multi-tip extension type radiofrequency ablation electrode needle

Abstract

The invention provides a multi-tip extension type radiofrequency ablation electrode needle. The multi-tip extension type radiofrequency ablation electrode needle comprises a trocar, a handle part and a plurality of control slide blocks, wherein one end of the trocar is provided with a needle outlet; a plurality of electrode auxiliary needles are arranged in the trocar in a penetrating way, can respectively extend out of the needle outlet, and are outwards extended and bent; the electrode auxiliary needles are arranged in the trocar in the circumferential direction; the handle part is fixedly arranged at the other end of the trocar, a plurality of metal slide bars are arranged in the handle part and can slide, one end of each metal slide bar is connected with the corresponding electrode auxiliary needle, and the other end of each metal slide bar is connected with a radiofrequency treatment instrument; the control slide blocks are glidingly arranged on the circumferential wall of the handle part, and are connected with the metal slide bars. The multi-tip extension type radiofrequency ablation electrode needle has the advantages that the needle discharging number, direction and length can be controlled, the directional extension of the electrode auxiliary needles is realized, the electrode needle is suitable for thoroughly ablating tumors under large blood vessels or at the edges of organs, and the operation is simple and convenient.

Description

technical field [0001] The invention relates to an electrode needle, in particular to a multi-needle point extended radiofrequency ablation electrode needle in the field of medical equipment. Background technique [0002] Tumor is a common malignant disease that endangers human health, and the treatment of tumor is an important topic to improve the survival period. In recent years, the local ablation technology for solid tumors represented by radiofrequency ablation technology has developed rapidly. Tumor ablation (tumorablation) is the direct application of chemotherapy or hyperthermia to a certain tumor (or several tumors) to eliminate or completely destroy the tumor, so that the entire tumor, including normal tissues with a thickness of about 0.5cm to 1cm in the periphery, is completely coagulated and necrotic and inactive. , forming a coagulation necrotic sphere that completely covers the entire tumor, and the inactivated tumor is located in it. The effect of this tumor...

AI Technical Summary

Problems solved by technology

[0004] Existing electrode needles for radiofrequency ablation include single-electrode straight needles (that is, single-point straight electrode needles) and multi-electrode straight needles (that is, multi-point straight electrode needles), such as Figure 1 to Figure 2 As shown, both the single-electrode straight needle and the multi-electrode straight needle are straight. When working, one or more electrode needles 1 are simultaneously inserted into the lesion for ablation. However, when the tumor 4 is located deep in the blood vessel 3, as shown in FIG. image 3 As shown, it is difficult for the straight electrode needles 1 to cross the large blood vessels to ablate the deep tumor 4 of the blood vessel 3. If it is desired to distribute multiple straight electrode needles 1 in parallel inside the tumor 4, it is difficult to arrange the needles, and the distance between the electrode needles 1 is not distributed. Uniform and easy to cause uneven heat radiation distribution among the electrode needles 1, affecting the scope of tissue necrosis, resulting in incomplete ablation of the lesion, easy residual tumor 4, and multiple electrode needles 1 will have multiple puncture points, which will bring pain to the patient. It is also easy to puncture blood vessels3, increasing the incidence of bleeding complications. Moreover, multiple tumors are of different sizes, so it is difficult to choose an electrode needle with a fixed ablation range

[0005] Existing electrode needles for radiofrequency ablation also include multi-tip expandable electrode needles, such as Figure 4 to Figure 6 As shown, the multi-tip expandable electrode needle includes a trocar 2 and 8-10 bendable arc-shaped electrode needles 1 inside the trocar 2, and the arc-shaped electrode needle 1 can extend from the end of the trocar 2. It is shown that the expanded shape is umbrella-shaped, anchor-shaped or Christmas tree-shaped, etc., to treat spherical tumors. When working, the trocar 2 is placed in the center of the tumor 4, so that multiple electrode needles 1 are evenly extended to the trocar. In the peripheral area of ​​the tube needle 2, even if all the electrode needles 1 are evenly distributed at 360 degrees in one needle placement operation, and the ablation shape tends to be spherical, it overcomes the deficiency that multiple straight electrode needles need multiple puncture points, and can produce relatively Large and reproducible necrotic foci, but when the tumor 4 is located deep in a large blood vessel, the electrode needle 1 cannot be completely placed in the center of the tumor 4 to cover and ablate the entire tumor 4 while avoiding the blood vessel 3 , resulting in incomplete ablation of the tumor 4, and the plurality of spherically expanded electrode needles 1 easily damage blood vessels 3 and most of the normal tissues, that is, the existing multi-tip expandable electrode needles cannot be expanded in a directional manner, so that the needle exit direction and exit direction The number of needles is uncontrollable

[0006] Taking liver tumors as an example, the existing radiofrequency ablation is a relatively low-risk method for the treatment of liver tumors. The mortality rate is only about 0.3% to 4.5%, and the incidence of serious complications is about 2.2% to 8.9%. important means, however, such as image 3 and Image 6 As shown, due to the irregular shape of the liver 5, there are many blood vessels 3 distributed inside the liver 5, and its surroundings are adjacent to organs such as the gallbladder and gastrointestinal tract, so radiofrequency ablation will be affected by the structure of the electrode needle 1 and the angle of needle placement. Therefore, tumors located below the large blood vessels or at the edge of the liver are difficult to be completely inactivated. Even after radiofrequency treatment, the tumors4 located below the large blood vessels or at the edge of the liver have a higher local recurrence rate than tumors at other locations. 4, the recurrence rate is higher, and the above-mentioned complications are mainly bleeding or peripheral organ damage, which is caused by the mechanical or thermal damage of the electrode against the blood vessel or surrounding structure.

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