Electron applicator

US4220866A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Leonhard Taumann · Lafayette, US
• Edgar B. Symmons · Walnut Creek, US

Key dates

• Filing date: Jan 21, 1978
• Grant date: Sep 2, 1980
• Expiry date: Jan 21, 1998

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61N2005/1089
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

In the illustrated embodiment, an electron collimator is to be mounted on the accessory holder of an electron accelerator. In radiation therapy, the down beam end of the applicator is to contact the patient to establish a precise spacing of the electron source therefrom. The legs of the L-shaped collimator plates have rods secured to the corner part thereof which link pairs of overlapping legs to a common carrier for joint lateral adjustment toward and away from the beam axis. The rods slide in apertures in the carrier as the legs are adjusted longitudinally. Cornered wall elements are secured to each collimator plate and overlap each other to surround the beam path, and have in-turned closely overlapping edges which terminate flush with the inner margins of the collimator plates so as to provide further electron collimation and to provide an essentially smooth patient contacting end face.