Patents by Inventor Hirofumi Jikuhara
Hirofumi Jikuhara 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: 8439677Abstract: The present invention provides a maintenance apparatus for increasing the service life of a medical handpiece. The maintenance apparatus is provided with a first fluid supply which feeds a maintenance fluid to the bearings of a handpiece, capable of rotatably supporting a rotary tool, and a second fluid supply which feeds the maintenance fluid to the chucking structure of the handpiece, capable of detachably holding the rotary tool.Type: GrantFiled: July 23, 2004Date of Patent: May 14, 2013Assignee: J. Morita Manufacturing CorporationInventors: Makoto Numakawa, Shigehiko Inoue, Makoto Kawakami, Hirofumi Jikuhara
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Publication number: 20110151395Abstract: A light emitting device is provided in a dental handpiece device for illuminating an area in the vicinity of a dental care tool at a tip of the dental handpiece device. The light emitting device includes a light emitting section including a light emitting diode element and an electrode, and an electric power control section for controlling electric power to be supplied to the light emitting diode element via the electrode. The electric power control section includes an electric current restriction element for restricting an amount of electric current to be supplied to the light emitting diode element, and a reverse voltage prevention element for preventing a reverse voltage from being applied to the light emitting diode element.Type: ApplicationFiled: December 22, 2010Publication date: June 23, 2011Applicant: J. MORITA MANUFACTURING CORPORATIONInventors: Kei Ishihara, Makoto Numakawa, Hirofumi Jikuhara
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Publication number: 20100262145Abstract: Provided is a medical cutting device including a housing, a cutting tool, a tool supporting unit and a load detecting unit. The housing supports the tool supporting unit and the load detecting unit. The tool supporting unit supports the cutting tool. The load detecting unit detects a load applied to the cutting tool.Type: ApplicationFiled: April 13, 2010Publication date: October 14, 2010Inventors: Ryosuke Kaji, Hirofumi Jikuhara
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Patent number: 7329123Abstract: A dental cutting device has a head portion (10) which accommodates a rotary cylinder (20) for holding a cutting tool (22), and a turbine blade (21) mounted around and secured on the rotary cylinder (20). Air fed from an air-supply port (24) is blown onto the turbine blade to rotate the same, and the air blown onto the turbine blade is exhausted from the exhaust port (25). The head portion has a first chamber (26) which is located at a portion confronting the outer peripheral end portion of the turbine blade and which extends in a direction orthogonal to the central axis of the rotary cylinder, and second chambers (27, 28) which are located adjacent to one or both ends of the turbine blade along the direction of the central axial and which communicate with the first chamber.Type: GrantFiled: May 9, 2003Date of Patent: February 12, 2008Assignee: J. Morita Manufacturing CorporationInventors: Noriyuki Tanaka, Shozo Nakayama, Hirofumi Jikuhara, Naruo Wada
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Publication number: 20060196728Abstract: The present invention provides a maintenance apparatus for increasing the service life of a medical handpiece. The maintenance apparatus is provided with a first fluid supply which feeds a maintenance fluid to the bearings of a handpiece, capable of rotatably supporting a rotary tool, and a second fluid supply which feeds the maintenance fluid to the chucking structure of the handpiece, capable of detachably holding the rotary tool.Type: ApplicationFiled: July 23, 2004Publication date: September 7, 2006Inventors: Makoto Numakawa, Shigehiko Inoue, Makoto Kawakami, Hirofumi Jikuhara
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Patent number: 7048540Abstract: A air-driven cutting device for medical treatment (a handpiece (10)) comprises a housing (18) for a head portion (14). The housing (18) accommodates a rotary cylinder (60) for holding a cylindrical cutting tool (46) inserted through the tool inlet (42) of the housing, and a turbine blade (62) mounted around and secured on the rotary cylinder. With this arrangement, a compressed air is blown onto the turbine blade to rotate the turbine blade, the rotor and the cutting tool. Particularly, a part or a whole of the end portion of the rotary cylinder in the vicinity of the tool inlet is covered with the cover section (42) of the housing. Therefore, the rotary cylinder does not contact the teeth or the tissues of the buccal cavity.Type: GrantFiled: May 9, 2003Date of Patent: May 23, 2006Assignee: J. Morita Manufacturing CorporationInventors: Hirofumi Jikuhara, Shozo Nakayama, Noriyuki Tanaka
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Publication number: 20040018467Abstract: A dental cutting device has a head portion (10) which accommodates a rotary cylinder (20) for holding a cutting tool (22), and a turbine blade (21) mounted around and secured on the rotary cylinder (20). Air fed from an air-supply port (24) is blown onto the turbine blade to rotate the same, and the air blown onto the turbine blade is exhausted from the exhaust port (25). The head portion has a first chamber (26) which is located at a portion confronting the outer peripheral end portion of the turbine blade and which extends in a direction orthogonal to the central axis of the rotary cylinder, and second chambers (27, 28) which are located adjacent to one or both ends of the turbine blade along the direction of the central axial and which communicate with the first chamber.Type: ApplicationFiled: May 9, 2003Publication date: January 29, 2004Applicant: J. Morita Manufacturing CorporationInventors: Noriyuki Tanaka, Shozo Nakayama, Hirofumi Jikuhara, Naruo Wada
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Publication number: 20040005528Abstract: A air-driven cutting device for medical treatment (a handpiece (10)) comprises a housing (18) for a head portion (14). The housing (18) accommodates a rotary cylinder (60) for holding a cylindrical cutting tool (46) inserted through the tool inlet (42) of the housing, and a turbine blade (62) mounted around and secured on the rotary cylinder. With this arrangement, a compressed air is blown onto the turbine blade to rotate the turbine blade, the rotor and the cutting tool. Particularly, a part or a whole of the end portion of the rotary cylinder in the vicinity of the tool inlet is covered with the cover section (42) of the housing. Therefore, the rotary cylinder does not contact the teeth or the tissues of the buccal cavity.Type: ApplicationFiled: May 9, 2003Publication date: January 8, 2004Applicant: J. Morita Manufacturing CorporationInventors: Hirofumi Jikuhara, Shozo Nakayama, Noriyuki Tanaka
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Patent number: 5993209Abstract: The periodontal pocket measurement apparatus of the present invention comprises a main handpiece unit provided with a cover member for covering the front end portion thereof, an operation member mounted at the front end of the cover member and being slidable in the longitudinal direction of the cover member, a flexible sleeve attached to the operation member and projecting from the front end of the cover member, and a probe attached to the cover member, passing through the sleeve and being exposable at its tip from the tip of the sleeve, being characterized in that the main handpiece unit is provided with energizing means for pushing a movable portion including the operation member and the sleeve toward the front end.Type: GrantFiled: December 9, 1997Date of Patent: November 30, 1999Assignee: Kabushiki Kaisha Morita SeisakushoInventors: Kazunari Matoba, Hirofumi Jikuhara, Hiroaki Kusakabe
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Patent number: 5902108Abstract: An air turbine handpiece comprises a grip portion and a head portion disposed at a tip of the grip portion. In the handpiece, a rotor is disposed in a chamber in the head portion, and a cutting tool is detachably attached to a rotation shaft which is rotated integrally with the rotor. A nozzle opening for injecting air toward a turbine blade portion and an exhaust opening for exhausting the injected air to the outside are opened to the chamber of the head portion. An arc width of the nozzle opening in a circumferential direction is two or more times a height in a direction of a rotation axis of the rotor. The nozzle opening is formed so as to extend in a width direction.Type: GrantFiled: February 24, 1998Date of Patent: May 11, 1999Assignee: J. Morita Manufacturing CorporationInventors: Shozo Nakayama, Haruo Ogawa, Makoto Numakawa, Hirofumi Jikuhara, Hajime Yokota