US 11,984,292 B2
Radiotherapy device and microwave source thereof
Cheng Ni, Shanghai (CN); Gang Pan, Shanghai (CN); Zhangfan Deng, Shanghai (CN); Mingyuan Song, Shanghai (CN); Zongrui Sun, Shanghai (CN); Haoshan Zhu, Shanghai (CN); Feichao Fu, Shanghai (CN); Jincheng Mei, Shanghai (CN); Chengjia Yuan, Shanghai (CN); Li Wang, Shanghai (CN); Xiaofeng Zhang, Shanghai (CN); and Jianxiong Zou, Shanghai (CN)
Assigned to SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD., Shanghai (CN)
Filed by SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD., Shanghai (CN)
Filed on Dec. 26, 2022, as Appl. No. 18/146,438.
Application 18/146,438 is a continuation of application No. PCT/CN2021/087063, filed on Apr. 13, 2021.
Claims priority of application No. 202010731106.4 (CN), filed on Jul. 27, 2020; application No. 202110184055.2 (CN), filed on Feb. 10, 2021; and application No. 202120513013.4 (CN), filed on Mar. 10, 2021.
Prior Publication US 2023/0154716 A1, May 18, 2023
Int. Cl. H01J 1/22 (2006.01); H01J 35/06 (2006.01)
CPC H01J 1/22 (2013.01) [H01J 35/064 (2019.05)] 20 Claims
OG exemplary drawing
 
1. A microwave source, comprising:
a cathode heater, wherein the cathode heater includes:
a first component including at least one filament, and
a second component enclosing at least a portion of the first component; and
a thermionic emitter configured to release electrons when the thermionic emitter is heated by the cathode heater, wherein at least a portion of the second component of the cathode heater is in contact with the thermionic emitter and the thermionic emitter is configured to surround the cathode heater.