Patents by Inventor Takehiko Asada
Takehiko Asada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11433229Abstract: A pressure relief valve for a reservoir has a main body with a central chamber defining an outer radial seat, a positive-pressure port with an inner radial seat, and a negative-pressure port comprising an internal passage spanning the outer seat. The sealing disk has an anchor body retained in the central chamber and a flexible diaphragm biased against the outer seat. An axial passage in the anchor body couples the central chamber to ambient atmospheric pressure. The sealing ball is biased against the inner seat. When a pressure inside the reservoir exceeds ambient by a positive-pressure threshold, then the sealing ball lifts off the inner radial seat to exhaust a gas through the positive-pressure port. When the pressure inside the reservoir is below ambient by a negative-pressure threshold, then the diaphragm is lifted off the outer seat to intake atmospheric gas into the reservoir.Type: GrantFiled: June 3, 2020Date of Patent: September 6, 2022Assignee: TERUMO CARDIOVASCULAR SYSTEMS CORPORATIONInventor: Takehiko Asada
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Publication number: 20210381612Abstract: A pressure relief valve for a reservoir has a housing body forming first and second subchambers in fluid communication. A first opening in a bottom surface of the housing body forms a first valve seat. At least one second opening in the bottom surface forms a second valve seat along an outer perimeter. A diaphragm member is biased against the second valve seat and is configured to deflect off of the second valve seat under a negative pressure. A sealing ball is gravitationally biased against the first valve seat and raises off the first valve seat in response to a positive pressure. A cover sheet on an upper surface of the housing body partially encloses the chamber and traps the sealing ball in the first subchamber. The cover sheet includes an aperture aligned with the second subchamber providing an ambient pressure port coupled to ambient atmosphere.Type: ApplicationFiled: November 9, 2020Publication date: December 9, 2021Inventors: Takehiko Asada, Ryan Clingman, Stephen Koellhoffer, Luke Powers
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Publication number: 20210379351Abstract: A pressure relief valve for a reservoir has a main body with a central chamber defining an outer radial seat, a positive-pressure port with an inner radial seat, and a negative-pressure port comprising an internal passage spanning the outer seat. The sealing disk has an anchor body retained in the central chamber and a flexible diaphragm biased against the outer seat. An axial passage in the anchor body couples the central chamber to ambient atmospheric pressure. The sealing ball is biased against the inner seat. When a pressure inside the reservoir exceeds ambient by a positive-pressure threshold, then the sealing ball lifts off the inner radial seat to exhaust a gas through the positive-pressure port. When the pressure inside the reservoir is below ambient by a negative-pressure threshold, then the diaphragm is lifted off the outer seat to intake atmospheric gas into the reservoir.Type: ApplicationFiled: June 3, 2020Publication date: December 9, 2021Inventor: Takehiko Asada
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Patent number: 11191943Abstract: A pressure relief valve for a reservoir has a housing body forming first and second subchambers in fluid communication. A first opening in a bottom surface of the housing body forms a first valve seat. At least one second opening in the bottom surface forms a second valve seat along an outer perimeter. A diaphragm member is biased against the second valve seat and is configured to deflect off of the second valve seat under a negative pressure. A sealing ball is gravitationally biased against the first valve seat and raises off the first valve seat in response to a positive pressure. A cover sheet on an upper surface of the housing body partially encloses the chamber and traps the sealing ball in the first subchamber. The cover sheet includes an aperture aligned with the second subchamber providing an ambient pressure port coupled to ambient atmosphere.Type: GrantFiled: November 9, 2020Date of Patent: December 7, 2021Assignee: TERUMO CARDIOVASCULAR SYSTEMS CORPORATIONInventors: Takehiko Asada, Ryan Clingman, Stephen Koellhoffer, Luke Powers
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Patent number: 8430652Abstract: A blood pump apparatus comprises a housing, a centrifugal pump section including an impeller and rotating inside the housing to feed a fluid by a centrifugal force, an impeller rotational torque generation section for attracting thereto said impeller and rotating said impeller; and a plurality of grooves for hydrodynamic bearing provided on an inner surface of said housing at a side of said impeller rotational torque generation section, each of the grooves for hydrodynamic bearing having a first side and a second side both extending from a periphery of said portion in which a groove for hydrodynamic bearing is formed toward a central side thereof and opposed to each other, a third side connecting one end of said first side and one end of said second side to each other, and a fourth side connecting said other end of said first side and said other end of said second side to each other; said first side and said second side are formed as a circular arc respectively in such a way that centers of said circular arcsType: GrantFiled: May 17, 2010Date of Patent: April 30, 2013Assignees: Terumo Kabushiki Kaisha, NTN CorporationInventors: Mitsutoshi Yaegashi, Takehiko Asada, Takehisa Mori, Takayoshi Ozaki, Kenichi Suzuki
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Publication number: 20100221130Abstract: A blood pump apparatus comprises a housing, a centrifugal pump section including an impeller and rotating inside the housing to feed a fluid by a centrifugal force, an impeller rotational torque generation section for attracting thereto said impeller and rotating said impeller; and a plurality of grooves for hydrodynamic bearing provided on an inner surface of said housing at a side of said impeller rotational torque generation section, each of the grooves for hydrodynamic bearing having a first side and a second side both extending from a periphery of said portion in which a groove for hydrodynamic bearing is formed toward a central side thereof and opposed to each other, a third side connecting one end of said first side and one end of said second side to each other, and a fourth side connecting said other end of said first side and said other end of said second side to each other; said first side and said second side are formed as a circular arc respectively in such a way that centers of said circular arcsType: ApplicationFiled: May 17, 2010Publication date: September 2, 2010Applicants: TERUMO KABUSHIKI KAISHA, NTN CORPORATIONInventors: Mitsutoshi Yaegashi, Takehiko Asada, Takehisa Mori, Takayoshi Ozaki, Kenichi Suzuki
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Patent number: 7748964Abstract: A blood pump apparatus comprises a housing, a centrifugal pump section including an impeller and rotating inside the housing to feed a fluid by a centrifugal force, an impeller rotational torque generation section for attracting thereto said impeller and rotating said impeller; and a plurality of grooves for hydrodynamic bearing provided on an inner surface of said housing at a side of said impeller rotational torque generation section, each of the grooves for hydrodynamic bearing having a first side and a second side both extending from a periphery of said portion in which a groove for hydrodynamic bearing is formed toward a central side thereof and opposed to each other, a third side connecting one end of said first side and one end of said second side to each other, and a fourth side connecting said other end of said first side and said other end of said second side to each other; said first side and said second side are formed as a circular arc respectively in such a way that centers of said circular arcsType: GrantFiled: March 24, 2005Date of Patent: July 6, 2010Assignees: Terumo Kabushiki Kaisha, NTN CorporationInventors: Mitsutoshi Yaegashi, Takehiko Asada, Takehisa Mori, Takayoshi Ozaki, Kenichi Suzuki
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Publication number: 20050287022Abstract: A blood pump apparatus comprises a housing, a centrifugal pump section including an impeller and rotating inside the housing to feed a fluid by a centrifugal force, an impeller rotational torque generation section for attracting thereto said impeller and rotating said impeller; and a plurality of grooves for hydrodynamic bearing provided on an inner surface of said housing at a side of said impeller rotational torque generation section, each of the grooves for hydrodynamic bearing having a first side and a second side both extending from a periphery of said portion in which a groove for hydrodynamic bearing is formed toward a central side thereof and opposed to each other, a third side connecting one end of said first side and one end of said second side to each other, and a fourth side connecting said other end of said first side and said other end of said second side to each other; said first side and said second side are formed as a circular arc respectively in such a way that centers of said circular arcsType: ApplicationFiled: March 24, 2005Publication date: December 29, 2005Applicants: TERUMO KABUSHIKI KAISHA, NTN CORPORATIONInventors: Mitsutoshi Yaegashi, Takehiko Asada, Takehisa Mori, Takayoshi Ozaki, Kenichi Suzuki
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Patent number: 6840735Abstract: A centrifugal fluid pump apparatus includes a control mechanism; and a body 5 including a pump section having an impeller rotating inside a housing; a rotor having an impeller attraction magnet; a motor for rotating the rotor; an impeller attraction electromagnet for attracting the impeller thereto; an impeller-position detection sensor; and a groove for hydrodynamic bearing provided on an inner surface of the housing. The control mechanism has a position sensor output monitoring function or an electromagnet current monitoring function, a motor current monitoring function; and an emergency impeller rotation function. The impeller rotation function operates when the sensors or the electromagnet has a failure by using the position sensor output monitoring function or the electromagnet current monitoring function to rotate the impeller by utilizing the groove for hydrodynamic bearing.Type: GrantFiled: January 9, 2003Date of Patent: January 11, 2005Assignee: Terumo Kabushiki KaishaInventors: Mitsutoshi Yaegashi, Takehiko Asada
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Publication number: 20030152462Abstract: A centrifugal fluid pump apparatus includes a control mechanism; and a body 5 including a pump section having an impeller rotating inside a housing; a rotor having an impeller attraction magnet; a motor for rotating the rotor; an impeller attraction electromagnet for attracting the impeller thereto; an impeller-position detection sensor; and a groove for hydrodynamic bearing provided on an inner surface of the housing. The control mechanism has a position sensor output monitoring function or an electromagnet current monitoring function, a motor current monitoring function; and an emergency impeller rotation function. The impeller rotation function operates when the sensors or the electromagnet has a failure by using the position sensor output monitoring function or the electromagnet current monitoring function to rotate the impeller by utilizing the groove for hydrodynamic bearing.Type: ApplicationFiled: January 9, 2003Publication date: August 14, 2003Inventors: Mitsutoshi Yaegashi, Takehiko Asada