The core technology provides promising Intra-Cavitary Radiotherapy apparatus and system having respectively expanding balloons in which the balloons can be expanded to the desired degree during the treatment for uterine cervical cancer. The apparatus for Intra-Cavitary Radiotherapy makes it possible to reduce geometric error, and can be managed independently so that other organs do not receive unnecessary radiation. Also, the balloons are billowed independently and packed in the vagina so that every treatment is an accurate and reproducible therapy.
Background and unmet needs
The principle of Intra-Cavitary Radiotherapy is that the sources are located proximal to the treatment target and deliver their entire dose within the tumor. It is different with external radiation therapy in that the distance between the source and the target is kept minimal. This could be an advantage in treatment, but also a liability in terms of accurately planning the dose as the applicator, target and critical structures change making the treated dose different from the planned dose. For over 2b stage cervix cancer, it is reported that the case of External Radiation Therapy keeps pace with Intra-Cavitary Radiotherapy can get better treatment effect than one thing. There are factors that restrict the placement of applicators and dose distribution within this process. For example, the position or thickness of the applicator can be changed by gauze packing. Also, it is difficult to obtain better, various and alternative dose distributions, since only three applicators are used in treatment. Also, the factor that only one tandem and two ovoids are used in ICR causes limited dose distribution and irregular dose distribution.
Discovery and Achievements
The Intra-Cavitary Radiotherapy Apparatus and System have expanding balloons which push organs such as the rectum and bladder in order to expand the internal vagina.
A surgeon is able to measure how much the vagina volume has expanded from a scale mark. Therefore, whenever he treats the patient again, he will know exactly how the apparatus should be set-up. Also, the Intra-Cavitary Radiotherapy Apparatus will reduce geometric applicator error from gauze packing or use without gauze packing. This helps to reduce the patient's inconvenience. Besides, inserting extension balloons into the vagina without gauze packing, reduces distance from the radiation source. Accordingly, It doesn't give pretty pain for a patient to get an expanded vagina, so we are able to expect to give them comfortable treatment.
Further, the holder can be formed in the inner surface of the cylinder. Additionally, the tandem and ovoid are installed in the holder, so that it can obtain better, more diverse and alternative dose distributions.
Since Thermo Luminescence Dosimeter (TLD) can be placed in the extension balloons, it allows one to get the value of the real given dose. Consequently, one can expect to obtain a variety type dose distribution and a plenty type dose distribution inside the vagina.