Multi-head microwave ablation needle and ablation simulation system establishment method

Abstract

The invention discloses a multi-head microwave ablation needle and an ablation simulation system establishment method. The microwave ablation needle comprises a main needle, an auxiliary needle, a handle and a sliding mechanism, wherein the main needle body is provided with more than one auxiliary needle channel, and the auxiliary needles are arranged in the auxiliary needle channels; the sliding mechanism comprises a sliding block, a connecting rod and a positioning screw; a required temperature field and an electromagnetic field are determined through the tumor solidification area, and a required ablation needle is determined according to the temperature field and the electromagnetic field. Incomplete ablation caused by an ablation gap generated between the auxiliary needle and the main needle can be effectively avoided, tissue fluid containing tumor cells can be prevented from being brought out of an ablation area, and the tumor cells can be completely ablated in the ablation area.

Description

technical field [0001] The invention relates to a tumor microwave ablation needle and a method for establishing an ablation simulation system, belonging to the technical field of medical devices. Background technique [0002] Microwave ablation needles heat tumor tissue through the thermal effect of microwaves to denature and coagulate proteins to achieve the goal of eradicating tumors. Compared with traditional surgical treatment, ablation treatment technology has the advantages of large ablation range and fewer complications, and has become a popular treatment for malignant liver tumors. Conventional treatments. [0003] Microwave ablation needles can usually ablate drop-shaped, spherical, and ellipsoid-shaped tumors. For abnormal-shaped tumors, such as abnormal-shaped tumors with three protrusions, the existing method is to increase the working parameters of the main needle when using one needle, so that The ablation area of ​​the main needle covers the three protrusions...

AI Technical Summary

Problems solved by technology

[0003] Microwave ablation needles can usually ablate drop-shaped, spherical, and ellipsoid-shaped tumors. For abnormal-shaped tumors, such as abnormal-shaped tumors with three protrusions, the existing method is to increase the working parameters of the main needle when using one needle, so that The ablation area of ​​the main needle covers the three protrusions, but the ablation in this way causes the ablation area to be too large

When multiple needles are used, there are two methods, one is to insert the needles at the same time, and the other is to insert the needles at different times and at the same time (the current method uses parallel double needles), and the double needles are inserted into the tumor in parallel. Then ablation is performed. The ablation area of ​​this ablation method is heart-shaped with gaps, resulting in incomplete ablation of the tumor.

In the prior art, the multiple needles used for simultaneous needle insertion are all inserted in parallel, mainly because the ablation area cannot be well determined when the needles are not inserted in parallel, which may cause ablation omission

There are also multi-needle ablation needles in the existing literature, such as Chinese patent 201620915873.X, which discloses a multi-tip extended radiofrequency ablation electrode needle, which adopts multiple electrode sub-needles arranged in the trocar along the circumferential direction, and can control The number of needles, the direction of the needles and the length of the needles realize the directional expansion of the electrode sub-needles, and ablation is performed through the electrode sub-needles during use. Therefore, the design of this ablation needle is similar to the parallel (non-parallel) insertion of multiple needles, and there is a The problem, that is, when ablation, there is a gap after the ablation range of each needle overlaps, and the ablation is not complete

According to the shape of the tumor, one needle is inserted first for ablation, and then another needle is inserted for ablation until the ablation area covers the tumor. The tissue fluid of tumor cells is brought to normal areas or areas that have been ablated, resulting in tumor spread and incomplete ablation

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