# US 10,478,541 B2 · Centrifugal pump for medical use and artificial heart assist device having centrifugal pump for medical use > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,478,541 B2 - Document ID: US10478541B2 - Status: Granted - Kind: B2 - Application number: 15/513,816 - Filed: 2015-09-24 - Published: 2017-10-19 - Granted: 2019-11-19 - Earliest claimed: 2014-09-26 - Assignees: Hi-Lex Corporation - Applicants: Hi-Lex Corporation - Inventors: Makoto Teraura - Web page: https://patentgrep.com/patent/US10478541B2 ## CPC - F04D 7/04: the fluids being viscous or non-homogenous - A61M 1/3666: {Cardiac or cardiopulmonary bypass, e.g. heart-lung machines} - A61M 60/109: incorporated within extracorporeal blood circuits or systems - A61M 60/148: in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices - A61M 60/178: drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices - A61M 60/196: replacing the entire heart, e.g. total artificial hearts [TAH] - A61M 60/232: Centrifugal pumps - A61M 60/38: Blood oxygenation - A61M 60/416: transmitted directly by the motor rotor drive shaft - A61M 60/422: the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps - A61M 60/827: Sealings between moving parts - F04D 29/167: {of a centrifugal flow wheel} - A61M 60/829: having a purge fluid supply - A61M 2205/3606: cooled - A61M 2205/366: by liquid heat exchangers - F04D 13/024: {a magnetic coupling} - F05D 2300/507: Magnetic properties - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A centrifugal pump includes a rotating shaft, a pump substrate, a housing and an impeller. The pump substrate has a driving unit configured to rotate the rotating shaft. The housing has an inlet and an outlet and forms a pump chamber with the pump substrate. A body fluid sucked from the inlet flows through the pump chamber. The impeller is housed in the pump chamber and is configured to use the rotating shaft as an axis. The pump substrate has a magnetism generating source. The rotating shaft protrudes into the pump chamber from the pump substrate, and is pivotally supported on the pump substrate. A magnetic fluid is disposed on at least one of spaces formed among the pump substrate, the rotating shaft, and the impeller. ## Claims ### Claim 1 A centrifugal pump for medical use, comprising: a rotating shaft; a pump substrate that has a driving unit configured to rotate the rotating shaft; a housing that has an inlet and an outlet and that forms a pump chamber with the pump substrate, the pump chamber through which a body fluid sucked from the inlet flows; and an impeller that is housed in the pump chamber and that is configured to use the rotating shaft as an axis, wherein the pump substrate has a magnetism generating source, the rotating shaft protrudes into the pump chamber from the pump substrate, and is pivotally supported on the pump substrate, a space is formed between the pump substrate and the impeller and a space is formed between the pump substrate and the rotating shaft, and a magnetic fluid is configured to seal an outer periphery side of the impeller in the space formed between the pump substrate and the impeller. ### Claim 2 (depends on 1) The centrifugal pump for medical use according to claim 1, wherein the driving unit is a motor, and the magnetism generating source is the motor. ### Claim 3 (depends on 2) An artificial heart assist device having the centrifugal pump for medical use according to claim 2, wherein the pump substrate and the housing are capable of being implanted in a human body. ### Claim 4 (depends on 1) An artificial heart assist device having the centrifugal pump for medical use according to claim 1, wherein the driving unit is a motor, and the pump substrate and the housing are capable of being implanted in a human body. ### Claim 5 (depends on 1) The centrifugal pump for medical use according to claim 1, wherein a space is formed between the rotating shaft and the impeller when the rotating shaft has a dual structure. ### Claim 6 (depends on 1) The centrifugal pump for medical use according to claim 1, wherein the magnetism generating source is provided at a position facing the outer periphery side of the impeller.