Patents by Inventor David K. Wrolstad
David K. Wrolstad 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: 20140251536Abstract: Apparatuses and methods for joining one or more tubing sections together to form a tubular catheter device, for shaping one or more tubular sections of a catheter device, and/or for fusing elements (e.g., a radiopaque marker) onto a portion of the catheter. Each section of the catheter is typically fabricated independently from the other sections. Subsequently, the separate sections are fused together to form the catheter. The methods described herein allow the various sections of the catheter to be fitted together for fabrication without the use of heat-shrink tubing. The fitted parts are clamped in a die or mold at a temperature at or near room temperature; the die is then rapidly heated to fuse the parts, rapidly cooled back down to a temperature at or about room temperature, and removed from the die.Type: ApplicationFiled: March 8, 2013Publication date: September 11, 2014Applicant: Abbott Cardiovascular Systems, Inc.Inventors: David K. Wrolstad, Justin K. Mann
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Patent number: 8828305Abstract: Methods for fabricating a polymeric stent with improved fracture toughness including radial expansion of a polymer tube and fabricating a stent from the expanded tube are disclosed. The polymer tube is disposed within a mold and may be heated with radiation. The heated tube radially expands within the mold.Type: GrantFiled: September 28, 2012Date of Patent: September 9, 2014Assignee: Abbott Cardiovascular Systems Inc.Inventors: Lothar W. Kleiner, James P. Oberhauser, Thierry Glauser, David K. Wrolstad, Yunbing Wang
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Publication number: 20140142561Abstract: A device for creating an arteriovenous (AV) fistula includes a proximal base having a distal tapered end surface and a distal tip connected to the proximal base and movable relative to the proximal base. The distal tip has a proximal tapered end surface. A first heating assembly, including an energized heating element, is disposed on at least one of the distal tapered end surface and the proximal tapered end surface. A second heating assembly, comprising a passive non-energized heat spreader, is disposed on the other one of the distal tapered end surface and the proximal tapered end surface. The distal tapered end surface and the proximal tapered end surface are adapted to contact opposing sides of a tissue portion to create the fistula. The taper of the proximal tapered end surface matches the taper of the distal tapered end surface, so that the two surfaces match one another and fully engage with one another when engaged.Type: ApplicationFiled: November 14, 2013Publication date: May 22, 2014Applicant: Caymus Medical, Inc.Inventors: Gene Reu, Brad M. Kellerman, David K. Wrolstad
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Publication number: 20140094791Abstract: A system for creating an arteriovenous (AV) fistula comprises a vessel access sheath having a hollow interior and an exit port, a side access needle catheter configured to fit within the hollow interior of the sheath, a needle configured to be inserted into a blood vessel through the side access needle catheter, a toggle delivery catheter configured to fit within the hollow interior of the sheath, and a toggle apparatus configured to be delivered into a vessel through the toggle delivery catheter. The toggle apparatus comprises a shaft and a toggle member pivotably attached to a distal end of the shaft. A source of RF energy or resistive heat energy may be provided for application to the toggle member and/or to a heater insert in the toggle delivery catheter, for the purpose of creating the fistula.Type: ApplicationFiled: December 4, 2013Publication date: April 3, 2014Applicants: BAJA RESEARCH , LLC., CAYMUS MEDICAL, INC.Inventors: Jeffrey E. Hull, Mark A. Ritchart, David K. Wrolstad
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Publication number: 20130281998Abstract: A catheter-based device tracks over a guidewire which has been placed from a first blood vessel into a second blood vessel. The distal tip of the catheter is advanced into the second vessel while a proximal member remains in the first vessel. Matching blunt tapered surfaces on each of the distal tip and the proximal member are clamped together, with adjacent walls of each vessel between them, after which a known, controlled pressure is applied between the two surfaces. Heat energy is then applied to the blunt surfaces for approximately 1-30 seconds to weld the walls of the two vessels together. After coaptation of the vessel walls, the heat is increased to then cut through the vessel walls to create a fistula of the desired size.Type: ApplicationFiled: February 8, 2013Publication date: October 24, 2013Applicants: Baja Research, LLC, Caymus Medical, Inc.Inventors: Brad M. Kellerman, David Trottingwolf Aldridge, David K. Wrolstad, Mark A. Ritchart, Jeffrey E. Hull, Gene Reu
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Patent number: 8308753Abstract: A locking component for locking a medical device onto a guide wire. Such medical devices include, for example, an embolic filter assembly used to capture embolic material that may be created and released into a patient's vasculature during a stenting or angioplasty procedure. The embolic filter assembly tracks along the guide wire, and is delivered to a treatment site where it is locked in place and deployed. The locking component enables the filter assembly to lock onto any standard guide wire, and does not require a modified guide wire that has a specially-designed fitting or stop to accomplish the locking function.Type: GrantFiled: February 25, 2010Date of Patent: November 13, 2012Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Douglas H. Gesswein, David K. Wrolstad, David H. Burkett, Robert C. Esselstein, Kathern J. Lind, Pablito Buan, Robert C. Hazelden, Thomas Tokarchik, III, Ryan Grandfield, Aaron Baldwin, Wayne E. Cornish, Philip Yip
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Patent number: 8303296Abstract: Methods of and systems for fabricating a polymeric stent with improved fracture toughness including radial expansion of a polymer tube along its entire length at the same time and fabricating a stent from the expanded tube are disclosed herein.Type: GrantFiled: July 27, 2011Date of Patent: November 6, 2012Assignee: Abbott Cardiovascular Systems Inc.Inventors: Lothar W. Kleiner, James P. Oberhauser, Thierry Glauser, David K. Wrolstad, Yunbing Wang
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Publication number: 20110306959Abstract: A device for creating an arteriovenous (AV) fistula comprises an elongate member, a distal member connected to the elongate member and movable relative to the elongate member, and a heating member disposed on at least one of the movable distal member and the elongate member. The distal member comprises structure for capturing tissue to be cut to create the fistula, and the heating member is adapted to cut through the tissue to create the fistula. The elongate member comprises an elongate outer tube. A shaft connects the distal member to the elongate member, and is extendable and retractable to extend and retract the distal member relative to the elongate member.Type: ApplicationFiled: June 15, 2011Publication date: December 15, 2011Applicants: BAJA RESEARCH, LLC., CAYMUS MEDICAL, INC.Inventors: Brad M. Kellerman, David Trottingwolf Aldridge, David K. Wrolstad, Mark A. Ritchart, Jeffrey E. Hull
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Publication number: 20110306993Abstract: A system for creating an arteriovenous (AV) fistula comprises a vessel access sheath having a hollow interior and an exit port, a side access needle catheter configured to fit within the hollow interior of the sheath, a needle configured to be inserted into a blood vessel through the side access needle catheter, a toggle delivery catheter configured to fit within the hollow interior of the sheath, and a toggle apparatus configured to be delivered into a vessel through the toggle delivery catheter. The toggle apparatus comprises a shaft and a toggle member pivotably attached to a distal end of the shaft. A source of RF energy or resistive heat energy may be provided for application to the toggle member and/or to a heater insert in the toggle delivery catheter, for the purpose of creating the fistula.Type: ApplicationFiled: June 15, 2011Publication date: December 15, 2011Applicants: BAJA RESEARCH , LLC., CAYMUS MEDICAL, INC.Inventors: Jeffrey E. Hull, Mark A. Ritchart, David K Wrolstad
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Publication number: 20110278771Abstract: Methods of and systems for fabricating a polymeric stent with improved fracture toughness including radial expansion of a polymer tube along its entire length at the same time and fabricating a stent from the expanded tube are disclosed herein.Type: ApplicationFiled: July 27, 2011Publication date: November 17, 2011Applicant: Abbott Cardiovascular Systems Inc.Inventors: Lothar W. Kleiner, James P. Oberhauser, Thierry Glauser, David K. Wrolstad, Yunbing Wang
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Patent number: 8029558Abstract: An improved stent design and stent delivery catheter assembly for repairing a main vessel and a side branch vessel forming a bifurcation. The stent includes rings aligned along a common longitudinal axis and connected by links, where the stent has one or more portals for aligning with and partially expanding into the opening to the side branch vessel. The stent is implanted at a bifurcation so that the main stent section is in the main vessel, and the portal section covers at least a portion of the opening to the side branch vessel. A second stent can be implanted in the side branch vessel and abut the expanded central section to provide full coverage of the bifurcated area in the main vessel and the side branch vessel. Radiopaque markers on the stent and on the tip of the delivery catheter assist in aligning the portal section with the opening to the side branch vessel.Type: GrantFiled: July 7, 2006Date of Patent: October 4, 2011Assignee: Abbott Cardiovascular Systems, Inc.Inventors: Diem Uyen Ta, Caroline Wu, Brenna K. Hearn, Daniel L. Cox, Leonard D. Barbod, Jessie Delgado, Stephen Dirk Pacetti, Thomas Ray Hatten, David K. Wrolstad, Kenneth Kay Armstrong, Darrin J. Kent
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Patent number: 8012402Abstract: Methods of fabricating a polymeric stent with improved fracture toughness including radial expansion of a polymer tube along its entire length at the same time and fabricating a stent from the expanded tube are disclosed herein.Type: GrantFiled: April 15, 2009Date of Patent: September 6, 2011Assignee: Abbott Cardiovascular Systems Inc.Inventors: Lothar W. Kleiner, James P. Oberhauser, Thierry Glauser, David K. Wrolstad, Yunbing Wang
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Publication number: 20110208286Abstract: An improved stent design and stent delivery catheter assembly for repairing a main vessel and a side branch vessel forming a bifurcation. The stent includes rings aligned along a common longitudinal axis and connected by links, where the stent has one or more portals for aligning with and partially expanding into the opening to the side branch vessel. The stent is implanted at a bifurcation so that the main stent section is in the main vessel, and the portal section covers at least a portion of the opening to the side branch vessel. A second stent can be implanted in the side branch vessel and abut the expanded central section to provide full coverage of the bifurcated area in the main vessel and the side branch vessel. Radiopaque markers on the stent and on the tip of the delivery catheter assist in aligning the portal section with the opening to the side branch vessel.Type: ApplicationFiled: May 2, 2011Publication date: August 25, 2011Applicant: ABBOTT CARDIOVASCULAR SYSTEMS INC.Inventors: Diem Uyen Ta, Caroline Wu, Brenna K. Hearn, Daniel L. Cox, Leonardo D. Barbod, Jessie Delgado, Stephen Dirk Pacetti, Thomas Ray Hatten, David K. Wrolstad, Kenneth Kay Armstrong, Darrin J. Kent
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Patent number: 7959667Abstract: An improved stent design and stent delivery catheter assembly for repairing a main vessel and a side branch vessel forming a bifurcation. The stent includes rings aligned along a common longitudinal axis and connected by links, where the stent has one or more portals for aligning with and partially expanding into the opening to the side branch vessel. The stent is implanted at a bifurcation so that the main stent section is in the main vessel, and the portal section covers at least a portion of the opening to the side branch vessel. A second stent can be implanted in the side branch vessel and abut the expanded central section to provide full coverage of the bifurcated area in the main vessel and the side branch vessel. Radiopaque markers on the stent and on the tip of the delivery catheter assist in aligning the portal section with the opening to the side branch vessel.Type: GrantFiled: December 21, 2006Date of Patent: June 14, 2011Assignee: Abbott Cardiovascular Systems Inc.Inventors: Diem Uyen Ta, Caroline Wu, Brenna K. Hearn, Daniel L. Cox, Leonard D. Barbod, Jessie Delgado, Stephen Dirk Pacetti, Thomas Ray Hatten, David K. Wrolstad, Kenneth Kay Armstrong, Darrin J. Kent
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Patent number: 7879065Abstract: A locking component for locking a medical device onto a guide wire. Such medical devices include, for example, an embolic filter assembly used to capture embolic material that may be created and released into a patient's vasculature during a stenting or angioplasty procedure. The embolic filter assembly tracks along the guide wire, and is delivered to a treatment site where it is locked in place and deployed. The locking component enables the filter assembly to lock onto any standard guide wire, and does not require a modified guide wire that has a specially-designed fitting or stop to accomplish the locking function.Type: GrantFiled: January 26, 2007Date of Patent: February 1, 2011Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Douglas H. Gesswein, David K. Wrolstad, David H. Burkett, Robert C. Esselstein, Kathern J. Lind, Pablito Buan, Robert C. Hazelden, Thomas Tokarchik, III, Ryan Grandfield, Aaron Baldwin, Wayne E. Cornish, Philip S. Yip
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Publication number: 20100152769Abstract: A locking component for locking a medical device onto a guide wire. Such medical devices include, for example, an embolic filter assembly used to capture embolic material that may be created and released into a patient's vasculature during a stenting or angioplasty procedure. The embolic filter assembly tracks along the guide wire, and is delivered to a treatment site where it is locked in place and deployed. The locking component enables the filter assembly to lock onto any standard guide wire, and does not require a modified guide wire that has a specially-designed fitting or stop to accomplish the locking function.Type: ApplicationFiled: February 25, 2010Publication date: June 17, 2010Applicant: ADVANCED CARDIOVASCULAR SYSTEMS, INC.Inventors: Douglas H. Gesswein, David K. Wrolstad, David H. Burkett, Robert C. Esselstein, Kathern J. Lind, Pablito Buan, Robert C. Hazelden, Thomas Tokarchik, III, Ryan Grandfield, Aaron Baldwin, Wayne E. Cornish, Philip S. Yip
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Patent number: 7678129Abstract: A locking component for locking a medical device onto a guide wire. Such medical devices include, for example, an embolic filter assembly used to capture embolic material that may be created and released into a patient's vasculature during a stenting or angioplasty procedure. The embolic filter assembly tracks along the guide wire, and is delivered to a treatment site where it is locked in place and deployed. The locking component enables the filter assembly to lock onto any standard guide wire, and does not require a modified guide wire that has a specially-designed fitting or stop to accomplish the locking function.Type: GrantFiled: March 19, 2004Date of Patent: March 16, 2010Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Douglas H. Gesswein, David K. Wrolstad, David H. Burkett, Robert C. Esselstein, Kathern J. Lind, Pablito Buan, Robert C. Hazelden, Thomas Tokarchik, III, Ryan Grandfield, Aaron Baldwin, Wayne E. Cornish, Philip S. Yip
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Publication number: 20100025894Abstract: Methods of fabricating a polymeric stent with improved fracture toughness including radial expansion of a polymer tube along its entire length at the same time and fabricating a stent from the expanded tube are disclosed herein.Type: ApplicationFiled: April 15, 2009Publication date: February 4, 2010Applicant: Abbott Cardiovascular Inc.Inventors: Lothar W. Kleiner, James P. Oberhauser, Thierry Glauser, David K. Wrolstad, Yunbing Wang
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Publication number: 20080009933Abstract: An improved stent design and stent delivery catheter assembly for repairing a main vessel and a side branch vessel forming a bifurcation. The stent includes rings aligned along a common longitudinal axis and connected by links, where the stent has one or more portals for aligning with and partially expanding into the opening to the side branch vessel. The stent is implanted at a bifurcation so that the main stent section is in the main vessel, and the portal section covers at least a portion of the opening to the side branch vessel. A second stent can be implanted in the side branch vessel and abut the expanded central section to provide full coverage of the bifurcated area in the main vessel and the side branch vessel. Radiopaque markers on the stent and on the tip of the delivery catheter assist in aligning the portal section with the opening to the side branch vessel.Type: ApplicationFiled: December 21, 2006Publication date: January 10, 2008Inventors: Diem Uyen Ta, Caroline Wu, Brenna K. Hearn, Daniel L. Cox, Leonard D. Barbod, Jessie Delgado, Stephen Dirk Pacetti, Thomas Ray Hatten, David K. Wrolstad, Kenneth Kay Armstrong, Darrin J. Kent
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Publication number: 20080009932Abstract: An improved stent design and stent delivery catheter assembly for repairing a main vessel and a side branch vessel forming a bifurcation. The stent includes rings aligned along a common longitudinal axis and connected by links, where the stent has one or more portals for aligning with and partially expanding into the opening to the side branch vessel. The stent is implanted at a bifurcation so that the main stent section is in the main vessel, and the portal section covers at least a portion of the opening to the side branch vessel. A second stent can be implanted in the side branch vessel and abut the expanded central section to provide full coverage of the bifurcated area in the main vessel and the side branch vessel. Radiopaque markers on the stent and on the tip of the delivery catheter assist in aligning the portal section with the opening to the side branch vessel.Type: ApplicationFiled: July 7, 2006Publication date: January 10, 2008Inventors: Diem Uyen Ta, Caroline Wu, Brenna K. Hearn, Daniel L. Cox, Leonard D. Barbod, Jessie Delgado, Stephen Dirk Pacetti, Thomas Ray Hatten, David K. Wrolstad, Kenneth Kay Armstrong, Darrin J. Kent