A simple, inexpensive applicator for irradiation of localized areas of the vagina with intracavitary brachytherapy.

PURPOSE

To describe the construction of a simple, inexpensive applicator for irradiation of localized areas of the vagina with intracavitary brachytherapy.

METHODS AND MATERIALS

It was desirable to avoid an interstitial implant in an elderly patient with a stage T2 vaginal cancer. The final phase of radiation therapy was delivered with a custom made intracavitary cylinder that allowed the high-dose area to be limited to the portion of the vagina at high risk for residual disease. The applicator was fabricated from a clear cast acrylic (Lucite) rod with dimensions 3.5 cm diameter x 5.0 cm long. The applicator contained 11 parallel grooves, each 1.8 mm deep x 2.2 mm wide, machined along the surface of the cylinder parallel its long axis at 1.0 cm increments. Plastic needles (15 gauge) were inserted into the grooves along the surface of the acrylic cylinder and held in place with heat shrink tubing. The applicator was easily inserted and positioned without anesthesia. Standard low dose rate 192Ir ribbons were inserted into the plastic needles after positioning the applicator in the vagina.

RESULTS

Construction of this applicator system requires a few weeks notice and approximately $150. Fabrication of the grooved cylinder is a routine task for a workshop with a milling machine. A step-by-step description of how to construct and use the applicator is provided along with the telephone numbers of commercial vendors to call to order all necessary materials.

CONCLUSION

This article describes a simple, inexpensive method for constructing a customized vaginal applicator that can be used to treat a limited area of the vagina with intracavitary brachytherapy.