US 12,295,713 B2
Permanent current switch apparatus and magnetic resonance imaging apparatus
Toshiki Idemaru, Ako (JP); Dai Yamashiro, Otawara (JP); and Kazuto Nogami, Nasushiobara (JP)
Assigned to CANON MEDICAL SYSTEMS CORPORATION, Otawara (JP)
Filed by CANON MEDICAL SYSTEMS CORPORATION, Otawara (JP)
Filed on Feb. 2, 2023, as Appl. No. 18/163,326.
Claims priority of application No. 2022-031504 (JP), filed on Mar. 2, 2022.
Prior Publication US 2023/0277082 A1, Sep. 7, 2023
Int. Cl. A61B 5/055 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/055 (2013.01) [A61B 5/0013 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A permanent current switch apparatus electrically connected to a superconducting coil via a superconducting wire, the permanent current switch apparatus comprising:
a first parallel structure including a first thermal permanent current switch and a second thermal permanent current switch, the first thermal permanent current switch and the second thermal permanent current switch being electrically connected to the superconducting coil in parallel, and the first thermal permanent current switch and the second thermal permanent current switch being capable of switching between a superconducting state and a normal conducting state; and
a second parallel structure including a third thermal permanent current switch and a fourth thermal permanent current switch, the third thermal permanent current switch and the fourth thermal permanent current switch being electrically connected to the superconducting coil in parallel, the third thermal permanent current switch and the fourth thermal permanent current switch being capable of switching between the superconducting state and the normal conducting state, and the first parallel structure and the second parallel structure being electrically connected to the superconducting coil in series.