Patents by Inventor Shigekazu Sekii
Shigekazu Sekii 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: 5373850Abstract: A flow-velocity sensor probe includes a thermistor for generating heat which is placed in a fluid, and a waterproof resin and a metal piece for easily radiating the heat generated by the thermistor. The flow velocity of the fluid is measured continuously from a change of temperature in the thermistor, and the thermistor is provided in close proximity to the metal piece for transmitting the heat to the fluid.Type: GrantFiled: May 21, 1992Date of Patent: December 20, 1994Assignee: Terumo Kabushiki KaishaInventors: Hiromasa Kohno, Kouji Tsuchida, Yoshio Ishitsu, Masaru Kurio, Shigekazu Sekii
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Patent number: 5178803Abstract: A multi-luminal catheter is characterized in that the cross-sectional shape of each lumen at a connection portion for an extension tube is molded in accordance with the outer shape of the extension tube to be connected. Accordingly, smooth and hermetic connection between a catheter body and the extension tube, that has not been accomplished in the past, can be obtained, and the formation of steps of the lumen which increases fluid resistance can be prevented. This mult-luminal catheter can be produced by pressing a core metal having substantially the same shape as that of the outer shape of the extension tube into each lumen of the catheter body at the connection portion for the extension tube and inserting the connection portion for the extension tube into a molding die while heating it.Type: GrantFiled: March 7, 1991Date of Patent: January 12, 1993Assignee: Terumo Kabushiki KaishaInventors: Kouji Tsuchida, Yoshio Ishitsu, Shigekazu Sekii
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Patent number: 5139021Abstract: A biological information measurement apparatus for measuring biological information by contacting a probe with a living body or inserting the probe into the living body includes a biological information detecting circuit for electrically detecting biological information, and a biological information processing circuit for digitally processing the biological information detected. Exchange of signals between the biological information detecting circuit and biological information processing circuit is performed in an electrically isolated state. Preferably, the apparatus is equipped with a first power supply circuit for supplying power solely to the biological information detecting circuit, and a second power supply circuit for supplying power to the first power supply circuit, wherein supply of power from the second power supply circuit to the first power supply circuit is performed in an electrically isolated state.Type: GrantFiled: June 24, 1991Date of Patent: August 18, 1992Assignee: Terumo Kabushiki KaishaInventors: Shigekazu Sekii, Makoto Ikeda, Kouji Tsuchida
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Patent number: 5092333Abstract: A catheter accommodating an electrical wire in the longitudinal direction thereof, wherein an enlargement is provided in at least part of its cavity, and an excess length of wire respect to the catheter in the unstretched state is accommodated slack in the enlargement.Type: GrantFiled: December 21, 1989Date of Patent: March 3, 1992Inventors: Kouji Tsuchida, Yoshio Ishitsu, Shigekazu Sekii
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Patent number: 5080106Abstract: An apparatus for measuring cardiac output designed to prevent measurement errors by eliminating the need for a manufacture step of examining a temperature sensing element during manufacture of the same and, hence, the need for a probe circuit or the like which is a means for effecting correction according to the characteristics of the temperature sensing element.Type: GrantFiled: January 9, 1990Date of Patent: January 14, 1992Assignee: Terumo Kabushiki KaishaInventors: Shigekazu Sekii, Kohji Tsuchida, Yoshio Ishitsu
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Patent number: 5046505Abstract: Disclosed is an apparatus for measuring a cardiac output on the basis of a dilution method.Type: GrantFiled: September 5, 1989Date of Patent: September 10, 1991Assignee: Terumo Kabushiki KaishaInventors: Shigekazu Sekii, Makoto Ikeda, Kouji Tsuchida
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Patent number: 5042976Abstract: A balloon catheter is provided, which comprises a catheter body made of a flexible tube provided with at least one inner channel and with an annular groove formed on an outer surface near the distal end portion of the tube, and a balloon covering the annular groove in such a manner that the outer diameter of the balloon is equal to or smaller than a maximum diameter of the distal end portion of the tube, the balloon being expanded or shrunk through another inner channel. A method of manufacturing the balloon catheter which comprises the steps of reducnig an outer diameter of a distal end portion of the catheter body while keeping a desired inner channel undamaged, mounting a tubular heat-resistant member to a prospective balloon mounting portion of the reduced diameter portion, molding a reduced diameter portion extruded from the heat-resistant member into a spherical shape, and mounting an inflatable balloon to the balloon mounting portion after removing the heat-resistant member.Type: GrantFiled: July 10, 1989Date of Patent: August 27, 1991Assignee: Terumo Kabushiki KaishaInventors: Yoshio Ishitsu, Kouji Tsuchida, Shigekazu Sekii
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Patent number: 5041083Abstract: A multi-luminal catheter of this invention is characterized in that the cross-sectional shape of each lumen at a connection portion for an extension tube is molded in accordance with the outer shape of the extension tube to be connected. Accordingly, smooth and hermetic connection between a catheter body and the extension tube, that has not been accomplished in the past, can be obtained, and the formation of steps of the lumen which increases fluid resistance can be prevented. This multi-luminal catheter can be produced by pressing a core metal having substantially the same shape as that of the outer shape of the extension tube into each lumen of the catheter body at the connection portion for the extension tube and inserting the connection portion for the extension tube into a molding die while heating it.Type: GrantFiled: December 18, 1989Date of Patent: August 20, 1991Assignee: Terumo Kabushiki KaishaInventors: Kouji Tsuchida, Yoshio Ishitsu, Shigekazu Sekii
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Patent number: 4979514Abstract: Disclosed are a cardiac output measurement method and a system for the application of the same, which perform the calibration of cardiac output by employing a blood flow velocity measurement method and perform continuous measurement of cardiac output. The system includes a blood temperature sensing element for sensing blood temperature, a blood temperature measurement circuit for generating a blood temperature signal indicative of the sensed blood temperature, an equilibrium temperature obtaining element capable of sensing cooling temperature of blood flow being heated, and an equilibrium temperature measurement circuit for generating an equilibrium temperature signal indicative of the sensed cooling temperature of blood flow heated.Type: GrantFiled: November 6, 1989Date of Patent: December 25, 1990Assignee: Terumo Kabushiki KaishaInventors: Shigekazu Sekii, Kohji Tsuchida, Yoshio Ishitsu
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Patent number: 4841981Abstract: A catheter introduced into the pulmonary artery for use in measuring cardiac output or blood flow velocity includes temperature sensing device including a temperature sensing element for sensing the temperature of blood in the pulmonary artery diluted by an indicator liquid infused for measurement of cardiac output based on a thermodilution method, and a self-heating thermistor for sensing a signal relating to blood flow velocity near the temperature sensing element, the signal being an equilibrium temperature sensed by the thermistor. The catheter is connected to a cardiac output measurement system adapted to measure cardiac output on the basis of the thermodilution method, measure the blood flow velocity which prevails when the cardiac output is measured, and obtain a parameter which links this blood flow velocity to the cardiac output measured in accordance with the thermodilution method.Type: GrantFiled: March 4, 1987Date of Patent: June 27, 1989Assignee: Terumo CorporationInventors: Susumu Tanabe, Shigekazu Sekii, Kouji Tsuchida, Yoshio Ishizu