Patents by Inventor Thomas Yung-Hui Chien
Thomas Yung-Hui Chien 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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Publication number: 20140336621Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: ApplicationFiled: July 25, 2014Publication date: November 13, 2014Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry A. Fukui, Jeffrey A. Sarge, Lawrence C. Alpert
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Patent number: 8795255Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: GrantFiled: November 12, 2012Date of Patent: August 5, 2014Assignee: Boston Scientific Scimed, Inc.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
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Patent number: 8317772Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: GrantFiled: March 10, 2011Date of Patent: November 27, 2012Assignee: Target Therapeutics, Inc.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
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Publication number: 20110172643Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: ApplicationFiled: March 10, 2011Publication date: July 14, 2011Applicant: TARGET THERAPEUTICS, INC.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
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Patent number: 7909812Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: GrantFiled: September 6, 2006Date of Patent: March 22, 2011Assignee: Target Therapeutics, Inc.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
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Patent number: 7691138Abstract: A catheter comprises a catheter shaft, at least a portion of which defines a medical device receiving region, and at least one sleeve. The at least one sleeve comprises a tubular member constructed and arranged to transition between an extended state and a retracted state. The tubular member has a first portion being engaged to a portion of the catheter shaft adjacent to the medical device receiving region. In the extended state a second portion is constructed and arranged to at least partially overlay the medical device receiving region. In the retraced state the second portion is removed from about the medical device receiving region. At least one of the first portion and the second portion of the tubular member are at least partially constructed from a shape memory material.Type: GrantFiled: December 14, 2004Date of Patent: April 6, 2010Assignee: Boston Scientific Scimed, Inc.Inventors: Eric B. Stenzel, Ronald A. Sahatjian, Sheng-ping Zhong, Kinh-Luan D. Dao, Peter L. Dayton, Daniel J. Kalashian, Stephen Griffin, Thomas Yung-hui Chien
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Patent number: 7338511Abstract: A solid embolic material that is capable of filling irregularly shaped and asymmetrical vascular defects in a controlled and predictable manner, without the difficulties associated with delivery of the embolic material through a microcatheter and containment of the embolic material in a defect. A detachable embolic balloon with optional check valve for maintaining liquid in the balloon prior to curing and optional multi-leaflet covering to prevent the balloon from expanding into the native vascular lumen.Type: GrantFiled: May 24, 2002Date of Patent: March 4, 2008Assignee: Boston Scientific-Scimed, Inc.Inventors: Gregory E. Mirigian, Huey Quoc Chan, Thomas Yung-Hui Chien, Stephen C. Porter, Robert P. Eury
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Patent number: 7104979Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: GrantFiled: February 19, 2002Date of Patent: September 12, 2006Assignee: Target Therapeutics, Inc.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
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Patent number: 6830575Abstract: A catheter comprises a catheter shaft, at least a portion of which defines a medical device receiving region, and at least one sleeve. The at least one sleeve comprises a tubular member constructed and arranged to transition between an extended state and a retracted state. The tubular member has a first portion being engaged to a portion of the catheter shaft adjacent to the medical device receiving region. In the extended state a second portion is constructed and arranged to at least partially overlay the medical device receiving region. In the retraced state the second portion is removed from about the medical device receiving region. At least one of the first portion and the second portion of the tubular member are at least partially constructed from a shape memory material.Type: GrantFiled: May 8, 2002Date of Patent: December 14, 2004Assignee: SciMed Life Systems, Inc.Inventors: Eric B. Stenzel, Ronald A. Sahatjian, Sheng-ping Zhong, Kinh-Luan D. Dao, Peter L. Dayton, Daniel J. Kalashian, Stephen Griffin, Thomas Yung-hui Chien
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Publication number: 20040199201Abstract: Devices and methods for removing a foreign object from a body lumen are disclosed. An embolectomy device can include a filter basket having a plurality of filter struts forming a cage-like structure that can be expanded to circumferentially surround the incoming foreign object. A support frame including a proximal hoop and one or more rail members may be employed to support the filter basket. The support frame and filter basket can be coupled to a pusher wire that can be used to manipulate the device within the body. In certain embodiments, the filter struts may vary in thickness to impart a desired flexibility characteristic to the device. Methods of manufacturing such devices are also disclosed.Type: ApplicationFiled: October 30, 2003Publication date: October 7, 2004Applicant: SCIMED LIFE SYSTEMS, INC.Inventors: James Kellett, Valerie Sontrop, Greg Welsh, Dushyant Jivanlal Shah, Kamal Ramzipoor, Mehran Bashiri, Ajitkumar Nair, Andrew Huffmaster, Thomas Yung-Hui Chien, Mark Minh Phung, Mediko Issakhani
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Publication number: 20030220666Abstract: A solid embolic material that is capable of filling irregularly shaped and asymmetrical vascular defects in a controlled and predictable manner, without the difficulties associated with delivery of the embolic material through a microcatheter and containment of the embolic material in a defect. A detachable embolic balloon with optional check valve for maintaining liquid in the balloon prior to curing and optional multi-leaflet covering to prevent the balloon from expanding into the native vascular lumen.Type: ApplicationFiled: May 24, 2002Publication date: November 27, 2003Applicant: SciMed Life Systems, Inc.Inventors: Gregory E. Mirigian, Huey Quoc Chan, Thomas Yung-Hui Chien, Stephen C. Porter, Robert P. Eury
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Patent number: 6648854Abstract: A single lumen balloon-tipped micro catheter, wherein the distal portion of the shaft is reinforced and extends into the balloon to eliminate abrupt transitions in stiffness in the balloon region. The balloon may be formed of a thermoplastic polyisoprene rubber such as hydrogenated polyisoprene which has superior performance and manufacturing attributes.Type: GrantFiled: May 14, 1999Date of Patent: November 18, 2003Assignee: SciMed Life Systems, Inc.Inventors: Marlowe E. Patterson, Thomas Yung-Hui Chien, Hanh Doan, Hong Doan, Huey Quoc Chan, Henry Nita
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Publication number: 20030212410Abstract: A catheter comprises a catheter shaft, at least a portion of which defines a medical device receiving region, and at least one sleeve. The at least one sleeve comprises a tubular member constructed and arranged to transition between an extended state and a retracted state. The tubular member has a first portion being engaged to a portion of the catheter shaft adjacent to the medical device receiving region. In the extended state a second portion is constructed and arranged to at least partially overlay the medical device receiving region. In the retraced state the second portion is removed from about the medical device receiving region. At least one of the first portion and the second portion of the tubular member are at least partially constructed from a shape memory material.Type: ApplicationFiled: May 8, 2002Publication date: November 13, 2003Inventors: Eric B. Stenzel, Ronald A. Sahatjian, Sheng-Ping Zhong, Kinh-Luan D. Dao, Peter L. Dayton, Daniel J. Kalashian, Stephen Griffin, Thomas Yung-Hui Chien
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Patent number: 6623452Abstract: An intravascular drug delivery balloon catheter incorporating a highly compliant balloon having a plurality of infusion holes. The highly compliant balloon elastically expands at a low inflation pressure (e.g., less than 1.0 ATM), and preferably has a compliance of 2.0 mm/ATM or more at pressures less than 2.0 ATM. A pressure relief valve may be incorporated into the catheter to avoid over pressurization. The infusion holes may be open when the balloon is deflated and may enlarge when the balloon is inflated. The balloon may define a single lobe or two inflatable lobes with the infusion holes disposed therebetween.Type: GrantFiled: December 19, 2000Date of Patent: September 23, 2003Assignee: SciMed Life Systems, Inc.Inventors: Thomas Yung-Hui Chien, Henry Nita, Alain Cornil
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Patent number: 6547804Abstract: A process and apparatus for occluding a vascular site. A catheter having a highly distensible occlusion balloon detachably mounted at a distal end thereof is provided to the vascular site and at least partially filled with an aqueous balloon inflation fluid which allows the balloon placement to be imaged. The balloon is porous to the aqueous inflation fluid and the inflation fluid is gradually displaced through the balloon pores by a liquid filling composition which is solidifiable on contact with the aqueous inflation fluid to produce a mass to which the balloon is nonporous. The filing composition is injected to bring the balloon wall into contact with the vessel wall at the vascular site. The balloon is detached from the catheter after the filling composition has at least substantially solidified and the catheter removed from the body.Type: GrantFiled: December 27, 2000Date of Patent: April 15, 2003Assignee: SciMed Life Systems, Inc.Inventors: Stephen Christopher Porter, Thomas Yung-Hui Chien, Huey Quoc Chan
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Patent number: 6527790Abstract: Improved intravascular balloon catheters for the delivery of embolic agents and devices such as coils to wide-neck aneurysms. In one embodiment, the present invention provides a balloon catheter having a combined guide wire/delivery lumen and a lateral delivery hole. The balloon may comprise a multi-lobed design with the delivery hole disposed between adjacent balloon lobes. The balloon catheter preferably includes a diversion member disposed in the combined lumen to cause the embolic device to divert from the combined lumen, through the delivery hole, and into the wide-neck aneurysm. In another embodiment, the present invention provides a balloon catheter having a shaft including a shaft tube and a co-extending embolic delivery tube. The delivery tube terminates proximal of the distal end of the shaft tube for added flexibility, and the balloon may inflate eccentrically to push the distal opening of the delivery lumen adjacent the opening of the wide-neck aneurysm.Type: GrantFiled: December 7, 2000Date of Patent: March 4, 2003Assignee: SciMed Life Systems, Inc.Inventors: Thomas Yung-Hui Chien, Greg P. Welsh, Huey Quoc Chan
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Publication number: 20020123738Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: ApplicationFiled: February 19, 2002Publication date: September 5, 2002Applicant: Target Therapeutics, Inc.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
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Publication number: 20020082638Abstract: A process and apparatus for occluding a vascular site. A catheter having a highly distensible occlusion balloon detachably mounted at a distal end thereof; is provided to the vascular site and at least partially filled with an aqueous balloon inflation fluid which allows the balloon placement to be imaged. The balloon is porous to the aqueous inflation fluid and the inflation fluid is gradually displaced through the balloon pores by a liquid filling composition which is solidifiable on contact with the aqueous inflation fluid to produce a mass to which the balloon is nonporous. The filling composition is injected to bring the balloon wall into contact with the vessel wall at the vascular site. The balloon is detached from the catheter after the filling composition has at least substantially solidified and the catheter removed from the body.Type: ApplicationFiled: December 27, 2000Publication date: June 27, 2002Inventors: Stephen Christopher Porter, Thomas Yung-Hui Chien, Huey Quoc Chan
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Publication number: 20020077594Abstract: An intravascular drug delivery balloon catheter incorporating a highly compliant balloon having a plurality of infusion holes. The highly compliant balloon elastically expands at a low inflation pressure (e.g., less than 1.0 ATM), and preferably has a compliance of 2.0 mm/ATM or more at pressures less than 2.0 ATM. A pressure relief valve may be incorporated into the catheter to avoid over pressurization. The infusion holes may be open when the balloon is deflated and may enlarge when the balloon is inflated. The balloon may define a single lobe or two inflatable lobes with the infusion holes disposed therebetween.Type: ApplicationFiled: December 19, 2000Publication date: June 20, 2002Applicant: SciMed Life Systems, Inc.Inventors: Thomas Yung-Hui Chien, Henry Nita, Alain Cornil
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Publication number: 20020072763Abstract: Improved intravascular balloon catheters for the delivery of embolic agents and devices such as coils to wide-neck aneurysms. In one embodiment, the present invention provides a balloon catheter having a combined guide wire/delivery lumen and a lateral delivery hole. The balloon may comprise a multi-lobed design with the delivery hole disposed between adjacent balloon lobes. The balloon catheter preferably includes a diversion member disposed in the combined lumen to cause the embolic device to divert from the combined lumen, through the delivery hole, and into the wide-neck aneurysm. In another embodiment, the present invention provides a balloon catheter having a shaft including a shaft tube and a co-extending embolic delivery tube. The delivery tube terminates proximal of the distal end of the shaft tube for added flexibility, and the balloon may inflate eccentrically to push the distal opening of the delivery lumen adjacent the opening of the wide-neck aneurysm.Type: ApplicationFiled: December 7, 2000Publication date: June 13, 2002Applicant: SciMed Life Systems, Inc.Inventors: Thomas Yung-Hui Chien, Greg P. Welsh, Huey Quoc Chan