Patents by Inventor Yue-Teh Jang
Yue-Teh Jang 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: 6264632Abstract: An intravascular catheter system has a balloon angioplasty device disposed about a common lumen near its distal end. The common lumen is in communication with multiple lumens within a proximal region of the catheter body to allow for positioning of the catheter over a movable guide wire and convenient delivery of imaging or interventional devices to a desired region of the blood vessel being treated.Type: GrantFiled: August 23, 1999Date of Patent: July 24, 2001Assignee: Cardiovascular Imaging Systems, Inc.Inventor: Yue-Teh Jang
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Patent number: 6234971Abstract: An ultrasonic imaging catheter comprises a catheter body having a distal region and proximal region. The distal region has a reduced cross-sectional area compared to that of the proximal region, and the proximal region includes at least two lumens therethrough for accommodating a movable guidewire and a rotatable working element, respectively. The catheter body may be inserted over the moveable guidewire, with the guidewire passing through a lumen in the distal region and the guidewire lumen in the proximal region. After positioning the catheter body, the guidewire can be retracted from the distal region and into the proximal region, leaving the lumen in the distal region available for the rotatable working element. Such a construction allows over-the-wire imaging of the catheter while minimizing the width of the catheter in the distal region which remains available for placement of the working element.Type: GrantFiled: July 13, 1999Date of Patent: May 22, 2001Assignee: Cardiovascular Imaging Systems, Inc.Inventor: Yue-Teh Jang
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Patent number: 6165200Abstract: The invention provides a nested tubing cannula which comprises outer and inner elongate tubular members, both having a proximal end, a distal end, and a lumen therebetween. The inner tubular member is sealed at its distal end and is nested substantially coaxially within the lumen of the outer tubular member, so that the gap between the inner and the outer tubular member defines a second lumen whereas the first lumen is the lumen of the inner tubular member. A tubular sleeve is disposed coaxially between the inner and outer tubular members. A balloon is mounted on a distal region of the outer tubular member and is in communication with the first lumen. The cannula further comprises a port proximal or distal the balloon occluder and is in communication with the second lumen. Methods for making the devices herein are disclosed.Type: GrantFiled: October 19, 1999Date of Patent: December 26, 2000Assignee: SciMed Life Systems, Inc.Inventors: Ross S. Tsugita, Tracy D. Maahs, Yue-Teh Jang
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Patent number: 6074362Abstract: A catheter system has a balloon angioplasty device disposed about a common lumen near its distal end. The balloon catheter is pre-fitted with a stent which is deployed when the balloon is inflated. The common lumen is in communication with multiple lumens within a proximal region of the catheter body to allow for positioning of the catheter over a movable guide wire and convenient delivery of imaging or interventional devices to a desired region of a body passageway being treated. The procedure for stent deployment optionally includes steps of imaging a lumen by ultrasound before and after stent deployment to identify the site at which a stent is needed, to confirm that the stent is being and has been deployed at a longitudinal position which does not overlap a branched segment of the body passageway, and to ensure that the stent has been radially opened to an optimum diameter.Type: GrantFiled: June 23, 1997Date of Patent: June 13, 2000Assignee: Cardiovascular Imaging Systems, Inc.Inventors: Yue-Teh Jang, Stephen M. Salmon, David A. White, Rizza A. Garcia
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Patent number: 6051014Abstract: A percutaneous filtration catheter used to entrap emboli from a patient's aorta and heart during cardiac surgery. The catheter has an elongate member, a proximal end, and a distal end. A balloon occluder is mounted on the distal end of the elongate member and an expandable filter is mounted on the elongate member distal the balloon occluder. Methods for using the devices are also disclosed herein.Type: GrantFiled: October 13, 1998Date of Patent: April 18, 2000Assignee: Embol-X, Inc.Inventor: Yue-Teh Jang
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Patent number: 6042598Abstract: An apparatus and method for treating stenosed blood vessels is provided, more particularly a percutaneous catheter, including a filter for capturing loose embolic material, used to deliver a stent, preferably within the ascending aorta, the aortic arch, or the carotid arteries. The catheter includes an expandable stent deployed on an inflatable balloon, or alternatively a self-expanding stent. A filter assembly is provided either directly on the catheter, or in a separate sheath or on a guidewire. The filter assembly comprises an expansion frame, having filter mesh attached to it, disposed on a guidewire inserted through the catheter or sheath, or alternatively attached directly on a distal region of the catheter. The expansion frame comprises a structure which is activated from a contracted condition into an enlarged condition in a blood vessel, thereby traversing the vessel with the filter mesh. The expansion frame includes biased struts, a mechanically operated frame, and/or a fluid-operated frame.Type: GrantFiled: April 5, 1999Date of Patent: March 28, 2000Assignee: Embol-X Inc.Inventors: Ross S. Tsugita, Tracy D. Maahs, Yue-Teh Jang
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Patent number: 6027520Abstract: An apparatus and method for treating stenosed blood vessels is provided, more particularly a percutaneous catheter, including a filter for capturing loose embolic material, used to deliver a stent, preferably within the ascending aorta, the aortic arch, or the carotid arteries. The catheter includes an expandable stent deployed on an inflatable balloon, or alternatively a self-expanding stent. A filter assembly is provided either directly on the catheter, or in a separate sheath or on a guidewire. The filter assembly comprises an expansion frame, having filter mesh attached to it, disposed on a guidewire inserted through the catheter or sheath, or alternatively attached directly on a distal region of the catheter. The expansion frame comprises a structure which is activated from a contracted condition into an enlarged condition in a blood vessel, thereby traversing the vessel with the filter mesh. The expansion frame includes biased struts, a mechanically operated frame, and/or a fluid-operated frame.Type: GrantFiled: April 5, 1999Date of Patent: February 22, 2000Assignee: Embol-X, Inc.Inventors: Ross S. Tsugita, Tracy D. Maahs, Yue-Teh Jang
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Patent number: 5997523Abstract: An ultrasonic imaging catheter comprises a catheter body having a distal region and proximal region. The distal region has a reduced cross-sectional area compared to that of the proximal region, and the proximal region includes at least two lumens therethrough for accommodating a movable guidewire and a rotatable working element, respectively. The catheter body may be inserted over the moveable guidewire, with the guidewire passing through a lumen in the distal region and the guidewire lumen in the proximal region. After positioning the catheter body, the guidewire can be retracted from the distal region and into the proximal region, leaving the lumen in the distal region available for the rotatable working element. Such a construction allows over-the-wire imaging of the catheter while minimizing the width of the catheter in the distal region which remains available for placement of the working element.Type: GrantFiled: November 13, 1992Date of Patent: December 7, 1999Assignee: Cardiovascular Imaging Systems, Inc.Inventor: Yue-Teh Jang
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Patent number: 5976093Abstract: An ultrasonic imaging catheter comprises a catheter body having a distal region and proximal region. The distal region has a reduced cross-sectional area compared to that of the proximal region, and the proximal region includes at least two lumens therethrough for accommodating a movable guidewire and a rotatable working element, respectively. The catheter body may be inserted over the moveable guidewire, with the guidewire passing through a lumen in the distal region and the guidewire lumen in the proximal region. After positioning the catheter body, the guidewire can be retracted from the distal region and into the proximal region, leaving the lumen in the distal region available for the rotatable working element. Such a construction allows over-the-wire imaging of the catheter while minimizing the width of the catheter in the distal region which remains available for placement of the working element.Type: GrantFiled: April 7, 1994Date of Patent: November 2, 1999Assignee: Cardiovascular Imaging Systems, Inc.Inventor: Yue-Teh Jang
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Patent number: 5941870Abstract: An intravascular catheter system has a balloon angioplasty device disposed about a common lumen near its distal end. The common lumen is in communication with multiple lumens within a proximal region of the catheter body to allow for positioning of the catheter over a movable guide wire and convenient delivery of imaging or interventional devices to a desired region of the blood vessel being treated.Type: GrantFiled: May 21, 1997Date of Patent: August 24, 1999Assignee: Cardiovascualr Imaging Systems, Inc.Inventor: Yue-Teh Jang
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Patent number: 5935114Abstract: A catheter exchange member is provided for reducing exchange time when replacing one catheter (or similar device) with another in the vascular anatomy of a patient. The catheter exchange member includes a tubular body having a proximal and a distal end and a central lumen. A tapered fixture having a distal port and a proximal opening which is larger than the distal port is attached to the tubular body at the distal port. An elongate shaft is attached to and extends proximally from either the tapered fixture or the tubular body. The exchange member is preferably used within a conventional guiding catheter where the tubular body is advanced through a distal end of the guiding catheter and into the coronary artery while the tapered fixture remains in the guiding catheter. This configuration allows various therapeutic and diagnostic devices to be stored within the guiding catheter just proximal to the tapered fixture.Type: GrantFiled: December 9, 1996Date of Patent: August 10, 1999Assignee: Cardiovascular Imaging Systems IncorporatedInventors: Yue-Teh Jang, Richard S. Ginn, Stephen M. Salmon
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Patent number: 5911734Abstract: An apparatus and method for treating stenosed blood vessels is provided, more particularly a percutaneous catheter, including a filter for capturing loose embolic material, used to deliver a stent, preferably within the ascending aorta, the aortic arch, or the carotid arteries. The catheter includes an expandable stent deployed on an inflatable balloon, or alternatively a self-expanding stent. A filter assembly is provided either directly on the catheter, or in a separate sheath or on a guidewire. The filter assembly comprises an expansion frame, having filter mesh attached to it, disposed on a guidewire inserted through the catheter or sheath, or alternatively attached directly on a distal region of the catheter. The expansion frame comprises a structure which is activated from a contracted condition into an enlarged condition in a blood vessel, thereby traversing the vessel with the filter mesh. The expansion frame includes biased struts, a mechanically operated frame, and/or a fluid-operated frame.Type: GrantFiled: May 8, 1997Date of Patent: June 15, 1999Assignee: Embol-X, Inc.Inventors: Ross S. Tsugita, Tracy D. Maahs, Yue-Teh Jang
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Patent number: 5910154Abstract: An apparatus and method for treating stenosed blood vessels is provided, more particularly a percutaneous catheter, including a filter for capturing loose embolic material, used to deliver a stent, preferably within the ascending aorta, the aortic arch, or the carotid arteries. The catheter includes an expandable stent deployed on an inflatable balloon, or alternatively a self-expanding stent. A filter assembly is provided either directly on the catheter, or in a separate sheath or on a guidewire. The filter assembly comprises an expansion frame, having filter mesh attached to it, disposed on a guidewire inserted through the catheter or sheath, or alternatively attached directly on a distal region of the catheter. The expansion frame comprises a structure which is activated from a contracted condition into an enlarged condition in a blood vessel, thereby traversing the vessel with the filter mesh. The expansion frame includes biased struts, a mechanically operated frame, and/or a fluid-operated frame.Type: GrantFiled: February 12, 1998Date of Patent: June 8, 1999Assignee: EMBOL-X, Inc.Inventors: Ross S. Tsugita, Tracy D. Maahs, Yue-Teh Jang
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Patent number: 5895397Abstract: Front-end and side-on intravascular catheters are described that comprise an abrasive head contained substantially within a housing. Aspiration means and flushing means are connected to the region of grinding to remove dislodged debris. A preferred embodiment has the abrasive surface of a rotatable head comprised of diamond powder. Another preferred embodiment has an ultrasonic transducer affixed to the head to permit transluminal imaging of the site of occlusion.Type: GrantFiled: August 30, 1996Date of Patent: April 20, 1999Assignee: Cardiovascular Imaging Systems, Inc.Inventors: Yue-Teh Jang, William Martin Belef
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Patent number: 5879305Abstract: Apparatus and method are described for introducing an imaging catheter to the coronary vasculature. A guiding catheter is introduced so that the distal end of the guiding catheter engages a coronary os. The distal end of the guiding catheter is shaped so that a mark on the distal end is oriented in a predetermined orientation relative to the coronary vasculature. An imaging catheter is then introduced through the guiding catheter and an image of the mark is produced with the imaging catheter while in the guiding catheter. In this manner, the relative orientation of the produced image and the coronary vasculature is known.Type: GrantFiled: October 20, 1997Date of Patent: March 9, 1999Assignee: Cardiovascular Imaging Systems, Inc.Inventors: Paul Yock, Yue-Teh Jang, Stephen M. Salmon
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Patent number: 5799655Abstract: A catheter for ultrasonic imaging has a transducer fixed to a cutter. The transducer is moved longitudinally within an artery while in a fixed radial position. Ultrasonic reflections are received and processed to display a planer or rectangular field of view image area of the artery. Other axial planes of the artery can be imaged by radially turning the transducer to a different angular orientation within the artery and then longitudinally moving the transducer to obtain an image of another planer field of view.Type: GrantFiled: December 5, 1996Date of Patent: September 1, 1998Assignee: Cardiovascular Imaging Systems, Inc.Inventors: Yue-Teh Jang, Axel F. Brisken
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Patent number: 5749848Abstract: A catheter system has a balloon angioplasty device disposed about a common lumen near its distal end. The balloon catheter is pre-fitted with a stent which is deployed when the balloon is inflated. The common lumen is in communication with multiple lumens within a proximal region of the catheter body to allow for positioning of the catheter over a movable guide wire and convenient delivery of imaging or interventional devices to a desired region of a body passageway being treated. The procedure for stent deployment optionally includes steps of imaging a lumen by ultrasound before and after stent deployment to identify the site at which a stent is needed, to confirm that the stent is being and has been deployed at a longitudinal position which does not overlap a branched segment of the body passageway, and to ensure that the stent has been radially opened to an optimum diameter.Type: GrantFiled: November 13, 1995Date of Patent: May 12, 1998Assignee: Cardiovascular Imaging Systems, Inc.Inventors: Yue-Teh Jang, Stephen M. Salmon, David A. White, Rizza A. Garcia
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Patent number: 5724977Abstract: Apparatus and method are described for introducing an imaging catheter to the coronary vasculature. A guiding catheter is introduced so that the distal end of the guiding catheter engages a coronary os. The distal end of the guiding catheter is shaped so that a mark on the distal end is oriented in a predetermined orientation relative to the coronary vasculature. An imaging catheter is then introduced through the guiding catheter and an image of the mark is produced with the imaging catheter while in the guiding catheter. In this manner, the relative orientation of the produced image and the coronary vasculature is known.Type: GrantFiled: September 4, 1996Date of Patent: March 10, 1998Assignee: Cardiovascular Imaging Systems Inc.Inventors: Paul Yock, Yue-Teh Jang, Stephen M. Salmon
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Patent number: 5634464Abstract: A catheter for ultrasonic imaging has a transducer fixed to a cutter. The transducer is moved longitudinally within an artery while in a fixed radial position. Ultrasonic reflections are received and processed to display a planer or rectangular field of view image area of the artery. Other axial planes of the artery can be imaged by radially turning the transducer to a different angular orientation within the artery and then longitudinally moving the transducer to obtain an image of another planer field of view.Type: GrantFiled: June 6, 1995Date of Patent: June 3, 1997Assignee: Cardiovascular Imaging Systems Inc.Inventors: Yue-Teh Jang, Axel F. Brisken
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Patent number: 5620417Abstract: A catheter exchange member is provided for reducing exchange time when replacing one catheter (or similar device) with another in the vascular anatomy of a patient. The catheter exchange member includes a tubular body having a proximal and a distal end and a central lumen. A tapered fixture having a distal port and a proximal opening which is larger than the distal port is attached to the tubular body at the distal port. An elongate shaft is attached to and extends proximally from either the tapered fixture or the tubular body. The exchange member is preferably used within a conventional guiding catheter where the tubular body is advanced through a distal end of the guiding catheter and into the coronary artery while the tapered fixture remains in the guiding catheter. This configuration allows various therapeutic and diagnostic devices to be stored within the guiding catheter just proximal to the tapered fixture.Type: GrantFiled: July 7, 1994Date of Patent: April 15, 1997Assignee: Cardiovascular Imaging Systems IncorporatedInventors: Yue-Teh Jang, Richard S. Ginn, Stephen M. Salmon