US 12,142,421 B2
Apparatus and system to enhance thermal gradients in cryogenic devices
Charles Lucian Dumoulin, Cincinnati, OH (US)
Assigned to CHILDREN'S HOSPITAL MEDICAL CENTER, Cincinnati, OH (US)
Filed by CHILDREN'S HOSPITAL MEDICAL CENTER, Cincinnati, OH (US)
Filed on Sep. 3, 2021, as Appl. No. 17/466,064.
Claims priority of provisional application 63/073,988, filed on Sep. 3, 2020.
Prior Publication US 2022/0068529 A1, Mar. 3, 2022
Int. Cl. H01F 6/04 (2006.01); G01R 33/3815 (2006.01)
CPC H01F 6/04 (2013.01) [G01R 33/3815 (2013.01)] 39 Claims
OG exemplary drawing
 
1. A thermal gradient enhancement system for use with liquid cryogens contained in cryogenic systems employing a cold head deployed in a cold head chamber, said system comprising:
a cold head chamber containing cryogens, the cold head chamber including a cold mass thermal link connected to a cold mass to facilitate heat transfer from the cold mass into the cold head chamber;
a cold head deployed in the cold head chamber above the cold mass thermal link; and
a core disposed around at least a portion of a cold head; and
a cryogen displacement structure extending radially from said core into said cold head chamber and at least partially separating the cryogens below the cryogenic displacement structure from the cryogens above the cryogenic displacement structure to reduce heat exchange between the cryogens below the cryogenic displacement structure and the cryogens above the cryogenic displacement structure.