# US 2018/0024209 A1 · Displacer in magnetic resonance imaging system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024209 A1 - Document ID: US20180024209A1 - Status: Published application - Kind: A1 - Application number: 15/721,801 - Filed: 2017-09-30 - Published: 2018-01-25 - Earliest claimed: 2014-11-04 - Assignees: Shanghai United Imaging Healthcare Co., Ltd. - Applicants: Shanghai United Imaging Healthcare Co., Ltd. - Inventors: Jianfeng LIU; Xingen YU; Lijun ZOU; Jin QIAN; Yong JIANG; Qing NI - Web page: https://patentgrep.com/patent/US20180024209A1 ## CPC - G01R 33/3804: {Additional hardware for cooling or heating of the magnet assembly, for housing a cooled or heated part of the magnet assembly or for temperature control of the magnet assembly} - G01R 33/3815: with superconducting coils, e.g. power supply therefor - H01F 6/04: Cooling - H01F 6/06: Coils, e.g. winding, insulating, terminating or casing arrangements therefor - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract Some embodiments of the present disclosure relate to a displacer for reducing the consumption of a cryogen used in a superconductive magnet device. The displacer may occupy some space within the cryogen storage cavity or limit the cryogen into a relatively small space surrounding a superconductive coil in the cryogen storage cavity. The displacer may also include a displacer cavity that may be vacuum or contain a cryogen or another substance. ## Claims ### Claim at position 1 1-33. (canceled) ### Claim 34 A device comprising: an inner tank configured to accommodate a volume of a cryogen, the inner tank having a first housing and a hollow cavity disposed through the first housing; a shielding housing configured to enclose the first housing, the shielding housing having a second housing and a pipe disposed through the second housing; an outer tank configured to enclose the shielding housing, a vacuumed cavity being formed between the inner tank and the outer tank; and a first tube connecting a first end of the pipe to the inner tank and configured to enable fluid communication between the inner tank and the pipe, wherein at least a part of the pipe is located in the hollow cavity. ### Claim 35 (depends on 34) The device of claim 34, further comprising: a second tube connecting a second end of the pipe to an exterior of the outer tank and configured to enable fluid communication between the pipe and the exterior of the outer tank. ### Claim 36 (depends on 35) The device of claim 35, wherein the first housing includes two end walls and a side wall, and the hollow cavity is formed by two holes located on the side wall of the first housing. ### Claim 37 (depends on 35) The device of claim 35, wherein the first housing includes two end walls and a side wall, and the hollow cavity is formed by a first hole located on the side wall and a second hole located on one of the two end walls. ### Claim 38 (depends on 35) The device of claim 35, wherein the first housing includes two end walls and a side wall, and the hollow cavity is formed by a first hole located on one of the two end walls and a second hole located on the other of the two end walls. ### Claim 39 (depends on 34) The device of claim 34, wherein the hollow cavity has a shape of a cylinder. ### Claim 40 (depends on 39) The device of claim 39, wherein the first housing has a shape of a cylinder, and an axis of the hollow cavity is parallel to an axis of the first housing. ### Claim 41 (depends on 39) The device of claim 39, wherein the first housing has a shape of a cylinder, and an axis of the hollow cavity is perpendicular to an axis of the first housing. ### Claim 42 (depends on 34) The device of claim 34, wherein the cryogen includes liquid helium. ### Claim 43 (depends on 34) The device of claim 34, wherein the pipe accommodates at least one heat exchange plate. ### Claim 44 (depends on 34) The device of claim 34, wherein the first housing accommodates a superconducting coil mounted on a coil former. ### Claim 45 A method for manufacturing a cryostat comprising: cutting two first cut-through holes on a first housing, the first housing being configured to accommodate a volume of a cryogen; inserting a displacer through the two first cut-through holes, the displacer having a hollow cavity with two ends, and an end of the hollow cavity being welded to one of the two first cut-through holes; cutting two second cut-through holes on a second housing which encloses the first housing, a second cut-through hole being disposed to face one of the two first cut-through holes; inserting a pipe through the two second cut-through holes, at least a part of the pipe being located in the hollow cavity of the displacer; and connecting, by a first tube, the pipe to the first housing, wherein the pipe is in fluid communication with the first housing through the first tube. ### Claim 46 (depends on 45) The method of claim 45, further comprising sealing the pipe before inserting the pipe through the two second cut-through holes. ### Claim 47 (depends on 45) The method of claim 45, further comprising sealing the pipe after inserting the pipe through the two second cut-through holes. ### Claim 48 (depends on 45) The method of claim 45, further comprising connecting the pipe to an exterior of the second housing by a second tube. ### Claim 49 (depends on 45) The method of claim 45, wherein the first housing includes two end walls and a side wall, and both of the two first cut-through holes are located on the side wall. ### Claim 50 (depends on 45) The method of claim 45, wherein the first housing includes two end walls and a side wall, one of the two first cut-through holes is located on the side wall, and the other of the two first cut-through holes is located on one of the two end walls. ### Claim 51 (depends on 45) The method of claim 45, wherein the first housing includes two end walls and a side wall, one of the two first cut-through holes is located on one of the two end walls, and the other of the two first cut-through holes is located on the other of the two end walls. ### Claim 52 (depends on 45) The method of claim 45, wherein the displacer has a shape of a cylinder. ### Claim 53 A magnetic resonance imaging system, comprising: a cryostat including: an inner tank configured to accommodate a volume of a cryogen, the inner tank having a first housing and a hollow cavity disposed through the first housing; a shielding housing configured to enclose the first housing, the shielding housing having a second housing and a pipe disposed through the second housing; an outer tank configured to enclose the shielding housing, a vacuumed cavity being formed between the inner tank and the outer tank; and a first tube connecting a first end of the pipe to the inner tank and configured to enable fluid communication between the inner tank and the pipe, wherein at least a part of the pipe is located in the hollow cavity; a first superconducting coil located in the inner tank, the first superconducting coil being configured to generate a static magnetic field; a gradient coil configured to generate a gradient magnetic field; and an RF coil configured to generate or receive an RF pulse.