After-loading radiotherapy applicator in rectum and vaginal cavity

Abstract

The present invention discloses a rectum and vagina intracavity after-loading radiation treatment radiator which comprises an external pipe one end of which is a circular arc surface while the other end is provided with a closing cap. The intracavity of the external pipe is provided with a radiator duct which is used to discharge radiation source. The intracavity of the external pipe is provided with three radiator ducts in the direction of shaft. The three radiator ducts are eccentricly arranged in a semi-circle on the cross section of the external pipe, and are distributed separately along a semi-circle arc curve. The radian between two adjacent radiator ducts is ranged from 40 to80 degrees. The end in same direction of the three radiator ducts is sealed at the end of external port by the closing cap and stretches outward. The present invention can discharge the radiation source through the three radiator ducts which are arranged eccentricly, can debase the irradiation amount accepted by the normal mucous membrane organization near the tumor in the rectum and vagina and the posterior wall of the bladder, can reduce the incidence rate of radioactivity complicating disease in early days and can improve radiation treatment effect.

Description

Technical field [0001] The invention relates to a device for radiotherapy of cancer, in particular to a post-installation radiotherapy applicator in the rectum and vagina. Background technique [0002] The traditional γ-ray applicator for rectal cavity afterloading treatment is a single-chamber applicator, that is, the applicator has only one applicator tube. For example, the remote-controlled high-dose afterloading machine produced by the Buchler factory has a 6mm inner diameter applicator model LA412 11 and a 4mm inner diameter applicator model LA412 15, both of which are single-cavity sources. The application tube of this kind of applicator is located in the center of the applicator, and several rectal dilators with a diameter of 1.5 cm can be attached to the outside. The Russian Radiation Engineering Research Center once designed the "applicator for rectal neutron afterloading therapy" and won the gold medal of the "Brusel Eureka-94" World Invention, Research and Industrial I...

AI Technical Summary

Problems solved by technology

However, since the source is administered through the source tube located in the center of the source applicator, the whole rectum receives the same irradiation dose during irradiation treatment, and it is difficult to control the irradiation area of ​​the rectum. , normal tissues and organs adjacent to the tumor are often damaged by excessive radiation at the same time, especially after sufficient external radiation and local supplementary internal radiation, severe damage is more likely to occur. In order to avoid this phenomenon, it is difficult to achieve local high dosimetry

Similarly, for radiotherapy of intravaginal tumors, the same problem exists

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