Patents by Inventor Da-Yu Chang
Da-Yu Chang 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: 9675453Abstract: A prosthetic heart valve configured to replace a native heart valve and for post-implant expansion and having a valve-type indicator thereon visible from outside the body post-implant. The indicator communicates information about the valve, such as the size or orifice diameter of the valve, and/or that the valve has the capacity for post-implant expansion. The indicator can be an alphanumeric symbol or other symbol or combination of symbols that represent information about the characteristics of the valve such as the valve size. The capacity for post-implant expansion facilitates a valve-in-valve procedure, where the valve-type indicator conveys information to the surgeon about whether the implanted valve is suitable for the procedure and informs the choice of the secondary valve.Type: GrantFiled: November 28, 2016Date of Patent: June 13, 2017Assignee: Edwards Lifesciences CorporationInventors: Jessica Guttenberg, Da-Yu Chang, Derrick Johnson, Brian S. Conklin, Qinggang Zeng, Myron Howanec, Jr., Grace Myong Kim
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Publication number: 20170071732Abstract: A prosthetic heart valve configured to replace a native heart valve and having a support frame configured to be reshaped into an expanded form in order to receive and/or support an expandable prosthetic heart valve therein is disclosed, together with methods of using same. Interlocking members or flexible loops are included to limit expansion of the valve to one or two valve sizes, for example, with a 2-mm gap between each valve size. The valve may include an internal structural band with overlapped free ends having structure for limiting expansion, or external loops of suture may be added to the fabric covering which limits expansion.Type: ApplicationFiled: September 8, 2016Publication date: March 16, 2017Inventors: Brian S. Conklin, Da-Yu Chang
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Publication number: 20170071735Abstract: A prosthetic heart valve configured to replace a native heart valve and for post-implant expansion and having a valve-type indicator thereon visible from outside the body post-implant. The indicator communicates information about the valve, such as the size or orifice diameter of the valve, and/or that the valve has the capacity for post-implant expansion. The indicator can be an alphanumeric symbol or other symbol or combination of symbols that represent information about the characteristics of the valve such as the valve size. The capacity for post-implant expansion facilitates a valve-in-valve procedure, where the valve-type indicator conveys information to the surgeon about whether the implanted valve is suitable for the procedure and informs the choice of the secondary valve.Type: ApplicationFiled: November 28, 2016Publication date: March 16, 2017Inventors: Jessica Guttenberg, Da-Yu Chang, Derrick Johnson, Brian S. Conklin, Qinggang Zeng, Myron Howanec, JR., Grace Myong Kim
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Patent number: 9585752Abstract: A holder for a hybrid heart valve prosthesis that can be quickly and easily implanted during a surgical procedure is provided. The hybrid heart valve includes a non-expandable, non-compressible prosthetic valve and a self-expandable anchoring stent, thereby enabling attachment to the annulus without sutures. A first suture connects the holder to the valve and constricts an inflow end of the anchoring stent. A second suture connects the holder to the valve and extends down three holder legs to loop through fabric on the valve. Both sutures may loop over a single cutting well on the holder so that severing the first and second sutures at the single cutting well simultaneously releases the tension in the first suture, permitting the inflow end of the anchoring stent to expand, and disconnects the valve holder from the prosthetic heart valve.Type: GrantFiled: April 29, 2015Date of Patent: March 7, 2017Assignee: Edwards Lifesciences CorporationInventors: Da-Yu Chang, Hilda Z. Fann
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Patent number: 9555244Abstract: The present invention is an improved package and configuration for an implantable retinal prosthesis. The retinal prosthesis of the present invention includes an electrode array suitable to be mounted in close proximity to a retina, an electronics package and inductive receiving coil mounted next to each other on a strap surrounding the sclera so that the height above the sclera of the prosthesis is minimized.Type: GrantFiled: May 23, 2013Date of Patent: January 31, 2017Assignee: Second Sight Medical Products, Inc.Inventors: Robert J Greenberg, Jerry Ok, Jordan Matthew Neysmith, Kevin Wilkin, Neil Hamilton Talbot, Da-Yu Chang
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Patent number: 9545517Abstract: The present disclosure describes a video device suitable to be word on the head of a user in the form of glasses. The glasses frame supports a camera, active electronics and a battery.Type: GrantFiled: August 8, 2013Date of Patent: January 17, 2017Assignee: Second Sight Medical Products, Inc.Inventors: Robert J Greenberg, Mark S Humayun, Rajat N Agrawal, Kevin Wilkin, James S Little, Da-Yu Chang
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Patent number: 9504566Abstract: A prosthetic heart valve configured to replace a native heart valve and for post-implant expansion and having a valve-type indicator thereon visible from outside the body post-implant. The indicator communicates information about the valve, such as the size or orifice diameter of the valve, and/or that the valve has the capacity for post-implant expansion. The indicator can be an alphanumeric symbol or other symbol or combination of symbols that represent information about the characteristics of the valve such as the valve size. The capacity for post-implant expansion facilitates a valve-in-valve procedure, where the valve-type indicator conveys information to the surgeon about whether the implanted valve is suitable for the procedure and informs the choice of the secondary valve.Type: GrantFiled: June 19, 2015Date of Patent: November 29, 2016Assignee: Edwards Lifesciences CorporationInventors: Jessica Guttenberg, Da-Yu Chang, Derrick Johnson, Brian S. Conklin, Qinggang Zeng, Myron Howanec, Jr., Grace M. Kim
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Publication number: 20160317813Abstract: The present invention is an improved hermetic package for a retinal prosthesis implanted in the human body. The retinal prosthesis includes a flexible circuit electrode array suitable to stimulate the retina while connected to a hermetic package on the outside of the eye, the hermetic package including a cover and a base where the cover is bonded to the base such that the cover and base form the hermetic package.Type: ApplicationFiled: July 11, 2016Publication date: November 3, 2016Applicant: Second Sight Medical Products, Inc.Inventors: Robert J. Greenberg, Jerry Ok, Jordan Neysmith, Kevin Wilkin, Neil Hamilton Talbot, Da-Yu Chang
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Publication number: 20160296331Abstract: A prosthetic heart valve configured to replace a native heart valve and having a support frame configured to be reshaped into an expanded form in order to receive and/or support an expandable prosthetic heart valve therein is disclosed, together with methods of using same. The prosthetic heart valve may be configured to have a generally rigid and/or expansion-resistant configuration when initially implanted to replace a native valve (or other prosthetic heart valve), but to assume a generally expanded form when subjected to an outward force such as that provided by a dilation balloon or other mechanical expander.Type: ApplicationFiled: June 22, 2016Publication date: October 13, 2016Inventors: Visith Chung, Da-Yu Chang, Brian S. Conklin, Grace Myong Kim, Louis A. Campbell, Donald E. Bobo, JR., Myron Howanec, JR., David S. Lin, Peng Norasing, Francis M. Tran, Mark Van Nest, Thomas H. Chien, Harvey H. Chen, Isidro L. Guerrero, Derrick Johnson, Paul A. Schmidt
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Patent number: 9415221Abstract: The present invention is an improved hermetic package for implantation in the human body. The implantable device of the present invention includes an eclectically non-conductive bass including electrically conductive vias through the substrate. A circuit is flip-chip bonded to a subset of the vias. A second circuit is wire bonded to another subset of the vias. Finally, a cover is bonded to the substrate such that the cover, substrate and vias form a hermetic package.Type: GrantFiled: May 28, 2013Date of Patent: August 16, 2016Assignee: Second Sight Medical Products, Inc.Inventors: Robert J Greenberg, Jerry Ok, Jordan Matthew Neysmith, Kevin Wilkin, Neil Hamilton Talbot, Da-Yu Chang
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Publication number: 20160183843Abstract: A valve sizer for determining an appropriate replacement valve size when performing a heart valve replacement procedure is provided. In one version the valve sizer has a hollow shaft with proximal and distal ends. A movable sizing element couples to the distal end of the shaft and is radially expandable between first, contracted and second, expanded positions. An actuator assembly on a handle includes an actuator coupled to a clutch member via a ball-spring-detent clutch. A rod extends through the shaft and maintains a fixed distance between the handle and a distal hub in the sizing element. Movement of the actuator causes axial movement of the shaft, thereby causing radial expansion of sizing petals relative to the hub. The clutch slips when a predetermined reaction force from the surrounding valve annulus is met by the petals.Type: ApplicationFiled: March 7, 2016Publication date: June 30, 2016Inventors: Brian S. Conklin, Da-Yu Chang
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Patent number: 9375310Abstract: A prosthetic heart valve configured to replace a native heart valve and having a support frame configured to be reshaped into an expanded form in order to receive and/or support an expandable prosthetic heart valve therein is disclosed, together with methods of using same. The prosthetic heart valve may be configured to have a generally rigid and/or expansion-resistant configuration when initially implanted to replace a native valve (or other prosthetic heart valve), but to assume a generally expanded form when subjected to an outward force such as that provided by a dilation balloon or other mechanical expander.Type: GrantFiled: December 20, 2013Date of Patent: June 28, 2016Assignee: Edwards Lifesciences CorporationInventors: Visith Chung, Da-Yu Chang, Brian S. Conklin, Grace M. Kim, Louis A. Campbell, Donald E. Bobo, Jr., Myron Howanec, David S. Lin, Peng Norasing, Francis M. Tran, Mark Van Nest, Thomas Y. Chien, Harvey H. Chen, Isidro L. Guerrero, Derrick Johnson, Paul A. Schmidt
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Patent number: 9277996Abstract: A valve sizer for determining an appropriate replacement valve size when performing a heart valve replacement procedure is provided. In one version the valve sizer has a hollow shaft with proximal and distal ends. A movable sizing element couples to the distal end of the shaft and is radially expandable between first, contracted and second, expanded positions. An actuator assembly on a handle includes an actuator coupled to a clutch member via a ball-spring-detent clutch. A rod extends through the shaft and maintains a fixed distance between the handle and a distal hub in the sizing element. Movement of the actuator causes axial movement of the shaft, thereby causing radial expansion of sizing petals relative to the hub. The clutch slips when a predetermined reaction force from the surrounding valve annulus is met by the petals.Type: GrantFiled: August 27, 2013Date of Patent: March 8, 2016Assignee: Edwards Lifesciences CorporationInventors: Brian S. Conklin, Da-Yu Chang
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Publication number: 20150366664Abstract: A prosthetic heart valve configured to replace a native heart valve and for post-implant expansion and having a valve-type indicator thereon visible from outside the body post-implant. The indicator communicates information about the valve, such as the size or orifice diameter of the valve, and/or that the valve has the capacity for post-implant expansion. The indicator can be an alphanumeric symbol or other symbol or combination of symbols that represent information about the characteristics of the valve such as the valve size. The capacity for post-implant expansion facilitates a valve-in-valve procedure, where the valve-type indicator conveys information to the surgeon about whether the implanted valve is suitable for the procedure and informs the choice of the secondary valve.Type: ApplicationFiled: June 19, 2015Publication date: December 24, 2015Inventors: Jessica Guttenberg, Da-Yu Chang, Derrick Johnson, Brian S. Conklin, Qinggang Zeng, Myron Howanec, JR., Grace M. Kim
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Publication number: 20150335892Abstract: A visor for visual stimulation of visually impaired subjects is shown. The visor comprises a frame, a coil, a camera and a mounting system. A connector allows the coil to be positioned along a first direction. A sliding device allows the coil to be positioned along a second direction. Positioning of the visor on a subject's nose allows the coil to be positioned along a third direction. Positioning of the coil along the first, second or third direction is useful to maximize coupling RF coupling between the coil and an internal coil implanted on a subject wearing the visor.Type: ApplicationFiled: August 3, 2015Publication date: November 26, 2015Inventors: Kelly H. McClure, Richard A. Castro, Sanjay Galkwad, Da-Yu Chang, Scott M. Loftin, Rongqing Dai, Robert J. Greenberg
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Publication number: 20150313711Abstract: A holder for a hybrid heart valve prosthesis that can be quickly and easily implanted during a surgical procedure is provided. The hybrid heart valve includes a non-expandable, non-compressible prosthetic valve and a self-expandable anchoring stent, thereby enabling attachment to the annulus without sutures. A first suture connects the holder to the valve and constricts an inflow end of the anchoring stent. A second suture connects the holder to the valve and extends down three holder legs to loop through fabric on the valve. Both sutures may loop over a single cutting well on the holder so that severing the first and second sutures at the single cutting well simultaneously releases the tension in the first suture, permitting the inflow end of the anchoring stent to expand, and disconnects the valve holder from the prosthetic heart valve.Type: ApplicationFiled: April 29, 2015Publication date: November 5, 2015Inventors: Da-Yu Chang, Hilda Z. Fann
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Patent number: 9095709Abstract: A visor for retinal stimulation of visually impaired. The visor comprises a frame, an external coil, a camera and a mounting system. A connector allows the external coil to be positioned along a first direction. A sliding device allows the external coil to be positioned along a second direction. Positioning of the visor on a subject's nose allows the external coil to be positioned along a third direction. Positioning of the external coil along the first, second or third direction is useful to maximize coupling RF coupling between the external coil and an internal coil implanted on a subject wearing the visor.Type: GrantFiled: August 15, 2007Date of Patent: August 4, 2015Assignee: Second Sight Medical Products, Inc.Inventors: Kelly H. McClure, Richard Agustin Castro, Sanjay Gaikwad, Da-Yu Chang, Scott M. Loftin, Rongqing Dai, Robert J. Greenberg
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Publication number: 20150066137Abstract: An inflation system having two pressure vessels integrated into a balloon catheter. A pressurized chamber and a vacuum chamber are integrally attached to proximal end of the balloon catheter and activated by a common valve or switch. Pressure or vacuum is selectively transmitted to the balloon depending on the valve/switch position. The working fluid may be air, or a combination of air and saline with an intermediate piston/cylinder assembly. The balloon catheter may be a part of a heart valve delivery system with a balloon-expandable heart valve crimped onto the balloon.Type: ApplicationFiled: August 27, 2014Publication date: March 5, 2015Inventors: Harvey H. Chen, Andrew Phung, Thomas Chien, Da-Yu Chang
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Publication number: 20150005671Abstract: A heart valve sizer and sizer cover are provided for determining the size of a heart valve annulus. The valve sizer can include a handle, a shaft extending distally from the handle, a sizing element coupled to the distal end of the shaft, the sizing element being movable between a first retracted position and a second expanded position, and a sizer cover. The sizer cover can be formed from a continuous sheet of material configured to surround at least a portion of the sizing element of the heart valve sizer so as to guard against entanglement of the sizing element with structures of a human heart.Type: ApplicationFiled: June 26, 2014Publication date: January 1, 2015Inventors: Gerald B. Gollinger, William A. Maywald, Derrick Johnson, Brian S. Conklin, Ankita Bordoloi, Da-Yu Chang
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Patent number: 8915960Abstract: A prosthetic tricuspid remodeling annuloplasty ring for use in tricuspid valve repairs to provide annular support after reconstructive valve surgery. The ring maintains an optimal annular dimension to prevent excessive dilatation of the natural valve annulus while adapting to the dynamic motion of the tricuspid annulus during the cardiac cycle. An exemplary ring features a waveform contour and may be constructed of a titanium core having a varying cross-section for selective flexibility for good Z-axis or out-of plane movement. The “waveform” contour and selective flexibility of the different segments of this ring are designed to adapt to the complex motion of the annulus. This reduces the stress on the anatomical structures and therefore minimizes the risk of arrhythmia and ring dehiscence.Type: GrantFiled: August 30, 2011Date of Patent: December 23, 2014Assignee: Edwards Lifesciences CorporationInventors: Alain F. Carpentier, William C. Brunnett, Louis A. Campbell, Da-Yu Chang, Steven Ford, John F. Migliazza, Anand Rao