US 12,412,723 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 May 13, 2024, as Appl. No. 18/663,015.
Application 18/663,015 is a continuation of application No. 18/146,438, filed on Dec. 26, 2022, granted, now 11,984,292.
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 2024/0297009 A1, Sep. 5, 2024
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 including a double helix filament, wherein the double helix filament includes a first filament and a second filament; and
a thermionic emitter configured to release electrons when the thermionic emitter is heated by the cathode heater;
wherein when the first filament and the second filament are disposed in a magnetic field and powered by a power source, a first direction of a first current flow in the first filament is opposite to a second direction of a second current flow in the second filament.