Patents by Inventor Daniel L. Schumann
Daniel L. Schumann 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: 8882786Abstract: Systems for closure of a physical anomaly. Closure is accomplished by a closure body with an exterior surface. The exterior surface contacts the opening of the anomaly and closes the anomaly. The closure body has a primary shape for closing the anomaly and a secondary shape for being positioned in the physical anomaly. The closure body preferably comprises a shape memory polymer.Type: GrantFiled: February 17, 2004Date of Patent: November 11, 2014Assignee: Lawrence Livermore National Security, LLC.Inventors: Jane P. Bearinger, Duncan J. Maitland, Daniel L. Schumann, Thomas S. Wilson
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Patent number: 7744604Abstract: A system for removing matter from a conduit. The system includes the steps of passing a transport vehicle and a shape memory polymer material through the conduit, transmitting energy to the shape memory polymer material for moving the shape memory polymer material from a first shape to a second and different shape, and withdrawing the transport vehicle and the shape memory polymer material through the conduit carrying the matter.Type: GrantFiled: June 30, 2005Date of Patent: June 29, 2010Assignee: Lawrence Livermore National Security, LLCInventors: Duncan Maitland, William J. Benett, Jane P. Bearinger, Thomas S. Wilson, Ward Small, IV, Daniel L. Schumann, Wayne A. Jensen, Jason M. Ortega, John E. Marion, III, Jeffrey M. Loge
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Publication number: 20100010437Abstract: A steerable catheter having a catheter tip connected to an elongated catheter body, with the catheter tip having an elastomeric cylindrical body and one or more steering lumens each offset from the longitudinal axis of the elastomeric cylindrical body and extending substantially the length of the elastomeric cylindrical body so that increasing the internal pressure of one or more of the steering lumens using, for example, a pneumatic or hydraulic pressure source or heating a thermally expandable media in the steering lumens, operates to curl the longitudinal axis of the elastomeric cylindrical body towards the internally pressurized steering lumen or lumens for steering the catheter tip.Type: ApplicationFiled: July 13, 2009Publication date: January 14, 2010Inventors: Robin R. Miles, Daniel L. Schumann, Mark A. Pearson, Dawn Hilken
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Patent number: 7291154Abstract: An actuator system is provided for acting upon a material in a vessel. The system includes an optical fiber and a shape memory polymer material operatively connected to the optical fiber. The shape memory polymer material is adapted to move from a first shape for moving through said vessel to a second shape where it can act upon said material.Type: GrantFiled: November 13, 2003Date of Patent: November 6, 2007Assignee: The Regents of the University of CaliforniaInventors: Duncan J. Maitland, Abraham P. Lee, Daniel L. Schumann, Dennis L. Matthews, Derek E. Decker, Charles A. Jungreis
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Publication number: 20040133231Abstract: An actuator system is provided for acting upon a material in a vessel. The system includes an optical fiber and a shape memory polymer material operatively connected to the optical fiber. The shape memory polymer material is adapted to move from a first shape for moving through said vessel to a second shape where it can act upon said material.Type: ApplicationFiled: November 13, 2003Publication date: July 8, 2004Applicant: The Regents of the University of CaliforniaInventors: Duncan J. Maitland, Abraham P. Lee, Daniel L. Schumann, Dennis L. Matthews, Derek E. Decker, Charles A. Jungreis
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Patent number: 6740094Abstract: An actuator system is provided for acting upon a material in a vessel. The system includes an optical fiber and a shape memory polymer material operatively connected to the optical fiber. The shape memory polymer material is adapted to move from a first shape for moving through said vessel to a second shape where it can act upon said material.Type: GrantFiled: January 16, 2001Date of Patent: May 25, 2004Assignee: The Regents of the University of CaliforniaInventors: Duncan J. Maitland, Abraham P. Lee, Daniel L. Schumann, Dennis L. Matthews, Derek E. Decker, Charles A. Jungreis
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Publication number: 20030236533Abstract: A system for removing an occlusion from a vessel. The system utilizes a shape memory polymer device for acting upon the occlusion. A transport vehicle moves a shape memory material through the vessel. The shape memory material is adapted to move from a first unexpanded coil shape to move through or around the occlusion, to a second expanded coil shape for acting upon the occlusion. A heat transfer mechanism is operatively connected to the shape memory material and is adapted to transfer heat to the shape memory material to move the shape memory material from the first shape to the second shape. The transport vehicle and the shape memory polymer material is withdrawn through the conduit carrying the occlusion matter. The system may include a second shape memory polymer device situated so that the occlusion material is gripped from both sides to facilitate removal.Type: ApplicationFiled: June 20, 2002Publication date: December 25, 2003Applicant: The Regents of the University of CaliforniaInventors: Thomas S. Wilson, Duncan Maitland, Daniel L. Schumann, Steve L. Little, Paul E. Ahre
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Publication number: 20020095169Abstract: An actuator system is provided for acting upon a material in a vessel. The system includes an optical fiber and a shape memory polymer material operatively connected to the optical fiber. The shape memory polymer material is adapted to move from a first shape for moving through said vessel to a second shape where it can act upon said material.Type: ApplicationFiled: January 16, 2001Publication date: July 18, 2002Applicant: The Regents of the University of CaliforniaInventors: Duncan J. Maitland, Abraham P. Lee, Daniel L. Schumann, Dennis L. Matthews, Derek E. Decker, Charles A. Jungreis
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Patent number: 6370757Abstract: A method and apparatus for loading deposit material, such as an embolic coil, into a shape memory polymer (SMP) gripping/release mechanism. The apparatus enables the application of uniform pressure to secure a grip by the SMP mechanism on the deposit material via differential pressure between, for example, vacuum within the SMP mechanism and hydrostatic water pressure on the exterior of the SMP mechanism. The SMP tubing material of the mechanism is heated to above the glass transformation temperature (Tg) while reshaping, and subsequently cooled to below Tg to freeze the shape. The heating and/or cooling may, for example, be provided by the same water applied for pressurization or the heating can be applied by optical fibers packaged to the SMP mechanism for directing a laser beam, for example, thereunto. At a point of use, the deposit material is released from the SMP mechanism by reheating the SMP material to above the temperature Tg whereby it returns to its initial shape.Type: GrantFiled: May 10, 2000Date of Patent: April 16, 2002Assignee: The Regents of the University of CaliforniaInventors: Abraham P. Lee, William J. Benett, Daniel L. Schumann, Peter A. Krulevitch, Joseph P. Fitch
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Patent number: 6328069Abstract: A device for purging contaminated oil from a lubrication conduit is provided. The device may be used wherever a contaminated fluid or gas is purged from a conduit circuit. The preferred embodiment includes a housing which may be finned to allow the radiating of heat from engine oil to the environment. The housing includes an inlet and a primary and secondary outlet adapted for serial installation in a conduit. The housing is further provided with primary bore and a secondary bore therethrough so as to allow communication between the inlet and the primary and secondary outlets. The primary bore includes a check valve seat with in the housing. The secondary outlet is fitted with a diverter valve seat and a diverter valve to allow a user to selectively open and close the diverter valve. The check valve allows normal oil flow during engine operation when the diverter valve is shut off but closes when a negative pressure exists at the primary outlet with respect to the secondary outlet.Type: GrantFiled: September 8, 2000Date of Patent: December 11, 2001Inventors: Timothy Andrew Schumann, Daniel L Schumann
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Publication number: 20010047579Abstract: A method and apparatus for loading deposit material, such as an embolic coil, into a shape memory polymer (SMP) gripping/release mechanism. The apparatus enables the application of uniform pressure to secure a grip by the SMP mechanism on the deposit material via differential pressure between, for example, vacuum within the SMP mechanism and hydrostatic water pressure on the exterior of the SMP mechanism. The SMP tubing material of the mechanism is heated to above the glass transformation temperature (Tg) while reshaping, and subsequently cooled to below Tg to freeze the shape. The heating and/or cooling may, for example, be provided by the same water applied for pressurization or the heating can be applied by optical fibers packaged to the SMP mechanism for directing a laser beam, for example, thereunto. At a point of use, the deposit material is released from the SMP mechanism by reheating the SMP material to above the temperature Tg whereby it returns to its initial shape.Type: ApplicationFiled: May 10, 2000Publication date: December 6, 2001Inventors: Abraham P. Lee, William J. Benett, Daniel L. Schumann, Peter A. Krulevitch, Joseph P. Fitch
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Patent number: 6240630Abstract: A method and apparatus for loading deposit material, such as an embolic coil, into a shape memory polymer (SMP) gripping/release mechanism. The apparatus enables the application of uniform pressure to secure a grip by the SMP mechanism on the deposit material via differential pressure between, for example, vacuum within the SMP mechanism and hydrostatic water pressure on the exterior of the SMP mechanism. The SMP tubing material of the mechanism is heated to above the glass transformation temperature (Tg) while reshaping, and subsequently cooled to below Tg to freeze the shape. The heating and/or cooling may, for example, be provided by the same water applied for pressurization or the heating can be applied by optical fibers packaged to the SMP mechanism for directing a laser beam, for example, thereunto. At a point of use, the deposit material is released from the SMP mechanism by reheating the SMP material to above the temperature Tg whereby it returns to its initial shape.Type: GrantFiled: December 3, 1997Date of Patent: June 5, 2001Assignee: The Regents of the University of CaliforniaInventors: Abraham P. Lee, William J. Benett, Daniel L. Schumann, Peter A. Krulevitch, Joseph P. Fitch
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Patent number: 6102917Abstract: A system for releasing a target material, such as an embolic coil from an SMP located at the end of a catheter utilizing an optical arrangement for releasing the material. The system includes a laser, laser driver, display panel, photodetector, fiber optics coupler, fiber optics and connectors, a catheter, and an SMP-based gripper, and includes a release sensing and feedback arrangement. The SMP-based gripper is heated via laser light through an optic fiber causing the gripper to release a target material (e.g., embolic coil for therapeutic treatment of aneurysms). Various embodiments are provided for coupling the laser light into the SMP, which includes specific positioning of the coils, removal of the fiber cladding adjacent the coil, a metal coating on the SMP, doping the SMP with a gradient absorbing dye, tapering the fiber optic end, coating the SMP with low refractive index material, and locating an insert between the fiber optic and the coil.Type: GrantFiled: July 15, 1998Date of Patent: August 15, 2000Assignee: The Regents of the University of CaliforniaInventors: Duncan J. Maitland, Abraham P. Lee, Daniel L. Schumann, Luiz Da Silva
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Patent number: 6059815Abstract: Microfabricated therapeutic actuators are fabricated using a shape memory polymer (SMP), a polyurethane-based material that undergoes a phase transformation at a specified temperature (Tg). At a temperature above temperature Tg material is soft and can be easily reshaped into another configuration. As the temperature is lowered below temperature Tg the new shape is fixed and locked in as long as the material stays below temperature Tg. Upon reheating the material to a temperature above Tg, the material will return to its original shape. By the use of such SMP material, SMP microtubing can be used as a retaining/release actuator for the delivery of material, such as embolic coils, for example, through catheters into aneurysms, for example. The microtubing can be manufactured in various sizes and the phase change temperature Tg is determinate for an intended temperature target and intended use. The SMP microtubing can be positioned around or within an end of a deposit material.Type: GrantFiled: April 28, 1998Date of Patent: May 9, 2000Assignee: The Regents of the University of CaliforniaInventors: Abraham P. Lee, Joseph P. Fitch, Daniel L. Schumann, Luiz Da Silva, William J. Benett, Peter A. Krulevitch