Applicator for radiotherapy of anal canal tumors

Abstract

The invention relates to a source applicator for anal canal tumor radiotherapy, the source applicator comprises a cylindrical source applicator body of which the diameter is 3cm, wherein the front end of the source applicator body is a spherical arc, the front segment of the source applicator body is a right cylinder segment of which the length is 8.5cm, the right cylinder segment comprises the spherical arc at the front end, the rear segment of the source applicator body is bent in a manner of a 150-degree arc, the arc length of an introvert of an arc-shaped bent segment is 5cm, the source applicator body is internally and axially provided with three source applying tubes which are eccentrically arranged in a semicircle of the introvert side of the cross section of the source applicator body and distributed in a manner of a circular curve, and the distance between the center of each source applying tube and the outer wall of the introvert side of the source applicator body is 5.5cm; an arc between the circle center of the first source applying tube and the circle center of the second source applying tube is equal to an arc between the circle center of the second source applying tube and the circle center of the third source applying tube, and a central angle corresponding to the arc is 60 degrees. The source applicator has a good radiotherapy effect on nidus that part carcinoma of the anal canal spreads outside the anus edge, reduces the possibility of tumor recurrence and facilitates radical cure of the tumor.

Description

technical field [0001] The invention relates to the field of anal canal cancer treatment, in particular to an applicator for radiotherapy of anal canal tumors. Background technique [0002] Brachytherapy is a form of radiation therapy. It can accurately place the radiation source in or near the malignant tumor, and use high-energy rays to kill tumor cells. It has the advantages of directly killing tumors, good therapeutic effect, and low recurrence rate. Advantages, widely used in the treatment of clinical tumors. The structure of the existing radioactive source carrier-source applicator is a straight tube structure, which can be close to the anal canal cancer lesion in the anus when performing radiotherapy on the anal canal cancer (ie, malignant tumor) lesion in the anus, The effect of radiotherapy is better. However, the cancerous lesions in the anus are very easy to spread outside the anus. When the anal canal cancer lesions in the anus spread to the outside of the anal...

AI Technical Summary

Problems solved by technology

However, the cancerous lesions in the anus are very easy to spread outside the anus. When the anal canal cancer lesions in the anus spread to the outside of the anal edge, a perianal cancer lesion is formed at the anus. The lesions of the perianal cancer in the mouth cannot be close to each other, and there will be a certain distance from the lesions of the perianal cancer, so it is no longer suitable for radiotherapy in this situation.

If the existing straight-tube source applicator is still used to treat perianal cancer with radioactive sources, the radiation dose reaching the lesion will be weakened due to the long distance, which will seriously affect the effect of radiotherapy and cause tumor recurrence; To be able to receive enough radiation, the dose of the radiation source must be increased, which will cause the normal skin tissue near the lesion to be over-irradiated and damaged, causing early complications of radiation

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