Microwave networks, waveguides, mixing carts, methods of supplying gas, and gas management systems for radiation therapy machines
AssigneeVarian Medical Systems, Inc.
InventorsOgy Sabev, Flavio Poehlmann-Martins, Reza Alibazi Behbahani
Life of this patent
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Abstract
A microwave network for a radiation therapy machine having a microwave source and a linear accelerator, includes a waveguide configured to connect between the microwave source and the linear accelerator. The waveguide contains at least one of a first gas or a second gas, the first gas being 2,3,3,3-tetrafluoro-2-(trifluoromethyl) propanenitrile and the second gas being 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone.
Claims18
A microwave network for a radiation therapy machine having a microwave source and a linear accelerator, the microwave network comprising:
- a waveguide configured to connect between the microwave source and the linear accelerator,
- a first portion of the waveguide containing at least one of a first gas or a second gas having a first characteristic, the first gas being 2,3,3,3-tetrafluoro-2-(trifluoromethyl) propanenitrile and the second gas being 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone, and
- a second portion of the waveguide containing at least one of the first gas or the second gas having a second characteristic, the second characteristic being different from the first characteristic;
- and
- a gas management device configured to adjust the first characteristic or the second characteristic of the at least one of the first gas or the second gas in the first portion and the second portion.
A mass-flow mixing cart to supply gases to a waveguide for a radiation therapy system, the mass-flow mixing cart comprising:
- a vacuum pump;
- a first valve connected to the vacuum pump, the first valve configured to control a vacuum pressure of at least a portion of the waveguide;
- a second valve configured to control introduction of a first gas into the portion of the waveguide, the first gas being one of 2,3,3,3-tetrafluoro-2-(trifluoromethyl) propanenitrile or 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone;
- and
- a third valve configured to control an introduction of a second gas into the portion of the waveguide, the second gas being a carrier gas.
A method of supplying a gas to a portion of a waveguide for a radiation therapy machine, the method comprising:
- heating a bottle with water from a water supply of the radiation therapy machine, the bottle including a first gas;
- supplying the first gas from the bottle to a piping that is in fluid communication with the portion of the waveguide, the first gas being one of 2,3,3,3-tetrafluoro-2-(trifluoromethyl) propanenitrile or 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone;
- and
- supplying a carrier gas to the piping.
A gas management system for a microwave network including a waveguide, the gas management system comprising:
- a gas management device configured to adjust a characteristic of a gas in the waveguide;
- and
- a first radiofrequency (RF)-blocking interface in fluid communication with the waveguide and with the gas management device, the first RF-blocking interface defining a plurality of vents, the plurality of vents configured to suppress radiofrequency wave from flowing into the gas management device and configured to allow the gas to enter the gas management device.
Dependencies are inferred from the claim text.