Patents by Inventor Gladwin S. Das

Gladwin S. Das 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).

  • Patent number: 8430934
    Abstract: An occlusion device includes a pair of connected members configured for being situated on opposing sides of a hole in a tissue, wherein the pair of connected members are formed of a material which is bioadsorbable to the tissue. The pair of connected members can include a non-metallic skeleton.
    Type: Grant
    Filed: September 1, 2004
    Date of Patent: April 30, 2013
    Assignee: Regents of the University of Minnesota
    Inventor: Gladwin S. Das
  • Patent number: 8128685
    Abstract: A bifurcated stent 10 and a stent configuration for manufacture of a bifurcated stent 10 are disclosed. The bifurcated stent 10 includes a first mono-tubular stent 12, a second mono-tubular stent 14, and a third mono-tubular stent 16 connected at their proximal ends to form the bifurcated stent 10. The first 12, second 14 and third 16 mono-tubular stents are connected using a first 32, second 34 and third 36 intraconnect extending from the proximal end of the first 12, second 14, and third 16 mono-tubular stents. A reinforcement member 130 may also be provided to reinforce the connection between the intraconnects 32, 34, 36. A reinforcing connector 112, 114, 116 may also be provided.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: March 6, 2012
    Assignee: Stent Tech, Inc
    Inventor: Gladwin S. Das
  • Publication number: 20090131868
    Abstract: Balloon catheters and stent delivery systems for medical treatment of a patient are disclosed. The balloon catheter includes a hub, a shaft and a first balloon and a second balloon. The first distal balloon and the second balloon may have different lengths. The first distal balloon and the second balloon may have different diameters. The first balloon and the second balloon may be configured to receive a bifurcated stent.
    Type: Application
    Filed: March 20, 2007
    Publication date: May 21, 2009
    Inventor: Gladwin S. Das
  • Publication number: 20090132027
    Abstract: A bifurcated stent 10 and a stent configuration for manufacture of a bifurcated stent 10 are disclosed. The bifurcated stent 10 includes a first mono-tubular stent 12, a second mono-tubular stent 14, and a third mono-tubular stent 16 connected at their proximal ends to form the bifurcated stent 10. The first 12, second 14 and third 16 mono-tubular stents are connected using a first 32, second 34 and third 36 intraconnect extending from the proximal end of the first 12, second 14, and third 16 mono-tubular stents. A reinforcement member 130 may also be provided to reinforce the connection between the intraconnects 32, 34, 36. A reinforcing connector 112, 114, 116 may also be provided.
    Type: Application
    Filed: January 31, 2006
    Publication date: May 21, 2009
    Applicant: STENT TECH, INC.
    Inventor: Gladwin S. Das
  • Publication number: 20090062898
    Abstract: Devices and methods for treating bifurcated body vessels, including stenosed, bifurcated coronary arteries. Methods can include advancing a guide catheter to the stenosed bifurcated region, advancing first and second guide wires through the guide catheter into separate vessel regions past the bifurcation, and then withdrawing the guide catheter. The method proceeds by advancing a balloon catheter having a bifurcated stent mounted to a Y-shaped distal balloon region over the guide wires, and positioning the bifurcated stent proximal of and distal to the bifurcation. Inflating the balloons dilates the stenosed region and expands the bifurcated stent. Kits provided by the present invention can include two guide wires, a guide catheter, a balloon catheter having a Y-shaped distal balloon region, and a bifurcated stent configured to be carried over the distal balloon region.
    Type: Application
    Filed: June 25, 2008
    Publication date: March 5, 2009
    Inventor: Gladwin S. Das
  • Publication number: 20090054967
    Abstract: Interconnects 14 for connecting radially expandable segments 12 of stents 10 are disclosed. Interconnects 14 include a proximal connector 44, a first arm 34, a second arm 36, and a distal connector 46. The connectors 44, 46 secure the interconnect 14 to the adjacent radially expandable segments 12. The first arm 34 and the second arm 36 provide expandable elements of the interconnect 14 to confer a degree of axial flexibility between the radially expandable segments 12.
    Type: Application
    Filed: January 30, 2006
    Publication date: February 26, 2009
    Inventor: Gladwin S. Das
  • Publication number: 20080103457
    Abstract: A system and method for treating heart failure, including the direct or indirect delivery of growth factors, or select portions thereof, to the heart in a therapeutic manner to provide sustained release and induce cell proliferation. The growth factors include peptide hormones, and further include particular sequences derived from human insulin like growth factor 1 (hIGF-1). The factors can be delivered to the pericardial space in a vehicle such as a hydrogel and using a device described herein.
    Type: Application
    Filed: January 11, 2006
    Publication date: May 1, 2008
    Applicant: Heart Failure Technologies, Inc. University Enterprise Laboratories (UEL)
    Inventors: Gladwin S. Das, Nezam Haider
  • Publication number: 20070266760
    Abstract: Apparatus and methods for manufacture of bifurcated stents are disclosed. The apparatus can include a base having a first mount, a second mount and a third mount. The first mount, the second mount and the third mount can be configured to secure a first mandrel, a second mandrel and a third mandrel at positions relative to one another. The mandrels may be configured to receive two or more mono-tubular stents so that the stents or components of the stents may be secured to one another to form a bifurcated stent.
    Type: Application
    Filed: May 17, 2006
    Publication date: November 22, 2007
    Inventors: Gladwin S. Das, Gary Oberg
  • Publication number: 20020133222
    Abstract: Expandable stents are disclosed. The stents have a plurality of rings or modules interconnected in series, with selectable links between the rings to provide for articulation. The preferred stent includes a plurality of modules, each of the modules being radially interconnected to form a ring configured to be expandably interconnected and being interconnected to each other in series by respective interconnection bridges. Each ring including a continuous strand of a material, the continuous strand of material being interconnected end to end so as to generally encompass a radial space within the ring. The strand of material being configured to include a repeating series of interconnected repeating W-shaped strand configurations having a repeating dip, rise, dip, rise, loop, dip, rise, dip, rise, loop patterned configuration.
    Type: Application
    Filed: March 11, 2002
    Publication date: September 19, 2002
    Inventor: Gladwin S. Das
  • Patent number: 6077281
    Abstract: The present invention provides a system and a method for closing septal defects and the like. The system includes a closure device having a pair of occluding disks, each disk being formed of a membrane and an elastically deformable frame carried about the periphery of the membrane. The frame, which may be formed of a superelastic material, is capable of being collapsed for passage through a catheter and elastically returning to a predetermined shape for tautly holding the membrane. A central portion of the membrane of each disk is attached to a central portion of the other membrane to define a conjoint disk. The method of the invention involves collapsing the frames of the disks, inserting the closure device into a catheter, and positioning the distal end of the catheter adjacent a septal defect. The first disk is then urged out of the distal end of the catheter to permit its frame to elastically return to a predetermined shape, pulling the membrane taut on one side of the defect.
    Type: Grant
    Filed: April 22, 1999
    Date of Patent: June 20, 2000
    Assignee: Regents of the University of Minnesota
    Inventor: Gladwin S. Das
  • Patent number: 6077291
    Abstract: The present invention provides a system and a method for closing septal defects and the like. The system includes a closure device having a pair of occluding disks, each disk being formed of a membrane and an elastically deformable frame carried about the periphery of the membrane. The frame, which may be formed of a superelastic material, is capable of being collapsed for passage through a catheter and elastically returning to a predetermined shape for tautly holding the membrane. A central portion of the membrane of each disk is attached to a central portion of the other membrane to define a conjoint disk. The method of the invention involves collapsing the frames of the disks, inserting the closure device into a catheter, and positioning the distal end of the catheter adjacent a septal defect. The first disk is then urged out of the distal end of the catheter to permit its frame to elastically return to a predetermined shape, pulling the membrane taut on one side of the defect.
    Type: Grant
    Filed: November 26, 1996
    Date of Patent: June 20, 2000
    Assignee: Regents of the University of Minnesota
    Inventor: Gladwin S. Das
  • Patent number: 5578045
    Abstract: The present invention provides a delivery system for delivering a device for closing septal defects and the like. The system comprises an elongate, flexible urging member for urging the closure device through a catheter and a remotely located control means for advancing the urging member. The control means includes a threaded, generally tubular shaft connected to the urging member and a manually rotatable rotor mounted on the shaft, the rotor having threads which mate with the threads on the shaft so that rotation of the rotor through a known angle will advance the shaft, and hence the urging member, a known distance. In a preferred embodiment, the urging member includes a core wire adapted to retain a closure device prior to final deployment and a release lever for releasing the closure device from the core wire when the closure device is properly positioned.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: November 26, 1996
    Assignee: Regents of the University of Minnesota
    Inventor: Gladwin S. Das
  • Patent number: 5554181
    Abstract: A stent comprising a self-expandable cylindrical body constructed out a single integral piece of material, including a plurality of wavy closed windings and strips interconnecting the windings such that the stent is prevented from stretching longitudinally is provided. The stent is self-expandable from a first radially-constrained, unexpanded diameter to a second, radially-unconstrained, expanded diameter. The stent can be implanted within a body cavity of an animal to maintain patency thereof.
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: September 10, 1996
    Assignee: Regents of the University of Minnesota
    Inventor: Gladwin S. Das
  • Patent number: 5334217
    Abstract: The present invention provides a system and a method for closing septal defects and the like. The system includes a closure device having a pair of occluding disks, each disk being formed of a membrane and an elastically deformable frame carried about the periphery of the membrane. The frame, which may be formed of a superelastic material, is capable of being collapsed for passage through a catheter and elastically returning to a predetermined shape for tautly holding the membrane. A central portion of the membrane of each disk is attached to a central portion of the other membrane to define a conjoint disk. The method of the invention involves collapsing the frames of the disks, inserting the closure device into a catheter, and positioning the distal end of the catheter adjacent a septal defect. The first disk is then urged out of the distal end of the catheter to permit its frame to elastically return to a predetermined shape, pulling the membrane taut on one side of the defect.
    Type: Grant
    Filed: May 14, 1993
    Date of Patent: August 2, 1994
    Assignee: Regents of the University of Minnesota
    Inventor: Gladwin S. Das