Patents by Inventor Randy S. Chan
Randy S. Chan 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: 20080287908Abstract: Substance delivering spacer devices may comprise expandable reservoirs that are implantable in paranasal sinuses and other cavities, openings and passageways of the body to maintain patency and to provide sustained local delivery of a therapeutic or diagnostic substance. Also provided are sinus penetrator devices and systems for performing ethmoidotomy procedures or for creating other openings in the walls of paranasal sinuses or other anatomical structures.Type: ApplicationFiled: April 9, 2008Publication date: November 20, 2008Applicant: Acclarent, Inc.Inventors: Ketan P. Muni, Hung V. Ha, John Y. Chang, Randy S. Chan, Nga K. Van, Joshua Makower, William M. Facteau, Howard L. Levine
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Patent number: 7419497Abstract: Devices, systems and methods for stenting, spacing, draining, ventilating and/or delivering drugs and other therapeutic or diagnostic substances to desired locations within the bodies of human or non-human animal subjects, including methods and systems for treating paranasal sinusitis and ethmoid disease.Type: GrantFiled: October 4, 2006Date of Patent: September 2, 2008Assignee: Acclarent, Inc.Inventors: Ketan P. Muni, Hung V. Ha, John H. Morriss, William E. Bolger, William M. Facteau, Joshua Makower, John Y. Chang, Randy S. Chan, Nga K. Van, Anton G. Clifford
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Publication number: 20080015540Abstract: Devices, systems and methods for stenting, spacing, draining, ventilating and/or delivering drugs and other therapeutic or diagnostic substances to desired locations within the bodies of human or non-human animal subjects, including methods and systems for treating paranasal sinusitis and ethmoid disease.Type: ApplicationFiled: October 4, 2006Publication date: January 17, 2008Applicant: Acclarent, Inc.Inventors: Ketan P. Muni, Hung V. Ha, John H. Morriss, William E. Bolger, William M. Facteau, Joshua Makower, John Y. Chang, Randy S. Chan, Nga K. Van, Anton G. Clifford
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Patent number: 6602228Abstract: An improved guidewire for advancing a catheter within a body lumen which has a high strength proximal portion, a distal portion formed of superelastic alloy and a connector formed of superelastic alloy to provide torque transmitting coupling between the distal end of the proximal portion and the proximal end of the distal portion. The superelastic alloy elements are preferably cold worked and then heat treated at a temperature well above the austenite-to-martensite transformation temperature, while being subjected to longitudinal stresses equal to about 5 to about 50% of the room temperature yield stress to impart to the metal a straight “memory.” The guiding member using such improved material exhibits a stress induced austenite-to-martensite phase transformation at an exceptionally high constant yield strength of at least 70 ksi for solid members and at least 50 ksi for tubular members with a broad recoverable strain of at least about 4% during the phase transformation.Type: GrantFiled: December 10, 2001Date of Patent: August 5, 2003Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Leonard Nanis, Robert M. Abrams, Randy S. Chan, Janet Walsh Burpee, Clifford Teoh
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Patent number: 6551350Abstract: The invention consists of an endoluminal prosthesis adapted for placement at a bifurcation site within the body. The stent or stent-graft may be constructed to have segments of differing structural properties. A section of the stent-graft may be constructed to have a single-lumen tubular stent member covering a multilumen graft member. The stent-graft may comprise at least two modular components adapted for in situ assembly. An extended cylindrical interference fit may be used to seal the modular components.Type: GrantFiled: December 23, 1996Date of Patent: April 22, 2003Assignee: Gore Enterprise Holdings, Inc.Inventors: Troy Thornton, Randy S. Chan, Lilip Lau
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Publication number: 20020165603Abstract: The invention consists of an endoluminal prosthesis adapted for placement at a bifurcation site within the body. The stent or stent-graft may be constructed to have segments of differing structural properties. A section of the stent-graft may be constructed to have a single-lumen tubular stent member covering a multilumen graft member. The stent-graft may comprise at least two modular components adapted for in situ assembly. An extended cylindrical interference fit may be used to seal the modular components.Type: ApplicationFiled: July 1, 2002Publication date: November 7, 2002Inventors: Troy Thornton, Randy S. Chan, Lilip Lau
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Publication number: 20020099436Abstract: The invention consists of an endoluminal prosthesis adapted for placement at a bifurcation site within the body. The stent or stent-graft may be constructed to have segments of differing structural properties. A section of the stent-graft may be constructed to have a single-lumen tubular stent member covering a multilumen graft member. The stent-graft may comprise at least two modular components adapted for in situ assembly. An extended cylindrical interference fit may be used to seal the modular components.Type: ApplicationFiled: November 5, 2001Publication date: July 25, 2002Inventors: Troy Thornton, Randy S. Chan, Lilip Lau
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Publication number: 20020087099Abstract: An improved guidewire for advancing a catheter within a body lumen which has a high strength proximal portion, a distal portion formed of superelastic alloy and a connector formed of superelastic alloy to provide torque transmitting coupling between the distal end of the proximal portion and the proximal end of the distal portion. The superelastic alloy elements are preferably cold worked and then heat treated at a temperature well above the austenite-to-martensite transformation temperature, while being subjected to longitudinal stresses equal to about 5 to about 50% of the room temperature yield stress to impart to the metal a straight “memory.” The guiding member using such improved material exhibits a stress induced austenite-to-martensite phase transformation at an exceptionally high constant yield strength of at least 70 ksi for solid members and at least 50 ksi for tubular members with a broad Recoverable strain of at least about 4% during the phase transformation.Type: ApplicationFiled: December 10, 2001Publication date: July 4, 2002Inventors: Leonard Nanis, Robert M. Abrams, Randy S. Chan, Janet Walsh Burpee, Clifford Teoh
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Patent number: 6413270Abstract: The invention consists of an endoluminal prosthesis adapted for placement at a bifurcation site within the body. The stent or stent-graft may be constructed to have segments of differing structural properties. A section of the stent-graft may be constructed to have a single-lumen tubular stent member covering a multilumen graft member. The stent-graft may comprise at least two modular components adapted for in situ assembly. An extended cylindrical interference fit may be used to seal the modular components.Type: GrantFiled: December 23, 1996Date of Patent: July 2, 2002Assignee: Gore Enterprise Holdings, Inc.Inventors: Troy Thornton, Randy S. Chan, Lilip Lau
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Patent number: 6379369Abstract: An improved guidewire for advancing a catheter within a body lumen which has a high strength proximal portion, a distal portion formed of superelastic alloy and a connector formed of superelastic alloy to provide torque transmitting coupling between the distal end of the proximal portion and the proximal end of the distal portion. The superelastic alloy elements are preferably cold worked and then heat treated at a temperature well above the austenite-to-martensite transformation temperature, while being subjected to longitudinal stresses equal to about 5 to about 50% of the room temperature yield stress to impart to the metal a straight “memory.” The guiding member using such improved material exhibits a stress induced austenite-to-martensite phase transformation at an exceptionally high constant yield strength of at least 70 ksi for solid members and at least 50 ksi for tubular members with a broad recoverable strain of at least about 4% during the phase transformation.Type: GrantFiled: December 2, 1997Date of Patent: April 30, 2002Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Robert M. Abrams, Randy S. Chan, Janet Walsh Burpee, Clifford Teoh
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Publication number: 20020029077Abstract: A delivery system including a restraining member maintains a collapsed implant in its collapsed state for delivery through a small passageway to a desired site in a mammalian body. Once the implant is positioned at the desired site, the restraining member is released so that the stent may expand or be expanded to its expanded state. In a preferred embodiment, the restraining member comprises a sheet of material that surrounds at least a portion of the collapsed stent. Portions of the restraining member are releasably coupled to one another with a low profile thread-like member or suture.Type: ApplicationFiled: November 5, 2001Publication date: March 7, 2002Inventors: Eric W. Leopold, Joseph C. Trautman, Troy Thornton, Randy S. Chan, Suresh S. Pai, Thomas G. Breton
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Patent number: 6352561Abstract: A delivery system including a restraining member maintains a collapsed implant in its collapsed state for delivery through a small passageway to a desired site in a mammalian body. Once the implant is positioned at the desired site, the restraining member is released so that the stent may expand or be expanded to its expanded state. In a preferred embodiment, the restraining member comprises a sheet of material that surrounds at least a portion of the collapsed stent. Portions of the restraining member are releasably coupled to one another with a low profile thread-like member or suture.Type: GrantFiled: December 23, 1996Date of Patent: March 5, 2002Assignee: W. L. Gore & AssociatesInventors: Eric W. Leopold, Joseph C. Trautman, Troy Thornton, Randy S. Chan, Suresh S. Pai, Thomas G. Breton
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Patent number: 5695111Abstract: An improved guidewire for advancing a catheter within a body lumen which has a high strength proximal portion, a distal portion formed of superelastic alloy and a connector formed of superelastic alloy to provide torque transmitting coupling between the distal end of the proximal portion and the proximal end of the distal portion. The superelastic alloy elements are preferably cold worked and then heat treated at a temperature well above the austenite-to-martensite transformation temperature, while being subjected to longitudinal stresses equal to about 5 to about 50% of the room temperature yield stress to impart to the metal a straight "memory." The guiding member using such improved material exhibits a stress induced austenite-to-martensite phase transformation at an exceptionally high constant yield strength of at least 70 ksi for solid members and at least 50 ksi for tubular members with a broad recoverable strain of at least about 4% during the phase transformation.Type: GrantFiled: July 15, 1994Date of Patent: December 9, 1997Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Leonard Nanis, Robert M. Abrams, Randy S. Chan, Janet Walsh Burpee, Clifford Teoh
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Patent number: 5341818Abstract: An improved guidewire for advancing a catheter within a body lumen which has a high strength proximal portion, a distal portion formed of superelastic alloy and a connector formed of superelastic alloy to provide a torque transmitting coupling between the distal end of the proximal portion and the proximal end of the distal portion. The superelastic alloy elements are preferably cold worked and then heat treated at a temperature well above the austenite-to-martensite transformation temperature, while being subjected to longitudinal stresses equal to about 5 to about 50% of the room temperature yield stress to impart to the metal a straight "memory". The guiding member using such improved material exhibits a stress induced austenite-to-martensite phase transformation at an exceptionally high constant yield strength of at least 70 ksi for solid members and at least 50 ksi for tubular members with a broad recoverable strain of at least about 4% during the phase transformation.Type: GrantFiled: December 22, 1992Date of Patent: August 30, 1994Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Robert M. Abrams, Randy S. Chan, Janet W. Burpee, Clifford Teoh
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Patent number: 5234002Abstract: A connecting system for making a threaded connection between the proximal end of a guidewire having male threads and the tubular distal end of an extension wire having female threads within the tubular distal end. The female threads are preferably formed by pressing the wall of the tubular member against a threaded mandrel disposed within the inner lumen of the tubular member so that the inwardly projecting surfaces of the dimples formed are deformed against the threaded mandrel.Type: GrantFiled: October 11, 1991Date of Patent: August 10, 1993Assignee: Advanced Cardiovascular Systems, Inc.Inventor: Randy S. Chan