Patents by Inventor David Z. J. Chu

David Z. J. Chu 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: 7390298
    Abstract: An expandable surgical retractor for use in minimal incision surgery is disclosed. The retractor consists of a fiber optic central rod surrounded by flexible wires designed to create an open space for visualization and surgical work within an illuminated surgical field. The flexible wires are disposed via selective pressure of the surgeon and are variable in number. The configuration will allow for both forward and back illumination of the surgical field. The expandable surgical retractor allows for surgical visualization in anatomical areas heretofore too complicated for surgical consideration. Other embodiments of the expandable surgical retractor are contemplated wherein a handle with an aperture may replace the central rod. The flexible wires may fit in openings around the aperture. The handle, in this embodiment, may have a light source and may be adapted to be used in select areas of anatomy. Further, the handle may be transparent.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: June 24, 2008
    Assignee: City of Hope
    Inventor: David Z. J. Chu
  • Publication number: 20080119880
    Abstract: A laparoscopic surgical clamp for use in minimally invasive surgical procedures includes an elongated shaft, a first set and a second set of double jaws connected to distal end of shaft and moveable relative to one another, and a double handle assembly operatively connected to at least one of the double jaws. The double jaws include an opened position in which the double jaws are separated and substantially parallel to one another and a closed position in which the double jaws are adjacent and substantially parallel to one another. At least one articulation segment is located on each jaw such that the double jaws may be positioned in a U- or V-shaped configuration when in an articulated position. A plurality of fenestration is located on at least one jaw of the double jaws to allow suturing through the double jaws to secure the surgical clamp to the organ tissue.
    Type: Application
    Filed: November 16, 2006
    Publication date: May 22, 2008
    Inventor: David Z. J. Chu
  • Patent number: 6926724
    Abstract: A temporary biocompatible stent and method for visceral anastomosis. The stent is provided with integral means for maintaining the structural stability of the stent while providing substantial flexibility. The method comprises fitting the luminal stumps of the viscus over either end of a stent of the invention, and joining the ends of each stump together. A short time after completion of the anastomosis, the stent dissolves and is absorbed safely into the body. The stent and method can be beneficially used in laparoscopic or more invasive traditional surgical procedures. The stent and method are particularly well suited for anastomosis of the bowel.
    Type: Grant
    Filed: May 4, 2000
    Date of Patent: August 9, 2005
    Assignee: City of Hope
    Inventor: David Z. J. Chu
  • Publication number: 20040236186
    Abstract: An expandable surgical retractor for use in minimal incision surgery is disclosed. The retractor consists of a fiber optic central rod surrounded by flexible wires designed to create an open space for visualization and surgical work within an illuminated surgical field. The flexible wires are disposed via selective pressure of the surgeon and are variable in number. The configuration will allow for both forward and back illumination of the surgical field. The expandable surgical retractor allows for surgical visualization in anatomical areas heretofore too complicated for surgical consideration. Other embodiments of the expandable surgical retractor are contemplated wherein a handle with an aperture may replace the central rod. The flexible wires may fit in openings around the aperture. The handle, in this embodiment, may have a light source and may be adapted to be used in select areas of anatomy. Further, the handle may be transparent.
    Type: Application
    Filed: December 31, 2003
    Publication date: November 25, 2004
    Inventor: David Z.J. Chu
  • Patent number: 6176834
    Abstract: A minimally invasive biopsy device includes a cylindrical retractor and a cylindrical cutting tool slidingly engaged within the cylindrical retractor. The cylindrical retractor is adapted for insertion in an incision above a lesion to be excised, and separates the walls of the incision to provide access to the tissue to be excised. The cylindrical cutting tool has a cutting means whichmakes a cylindrical incision around the tissue to be excised. The tissue can then be accurately and quickly removed.
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: January 23, 2001
    Assignee: City of Hope
    Inventors: David Z. J. Chu, Todd McCarty
  • Patent number: 5882316
    Abstract: A minimally invasive biopsy device includes a cylindrical retractor and a cylindrical cutting tool slidingly engaged within the cylindrical retractor. The cylindrical retractor is adapted for insertion in an incision above a lesion to be excised, and separates the walls of the incision to provide access to the tissue to be excised. The cylindrical cutting tool has a cutting means which makes a cylindrical incision around the tissue to be excised. The tissue can then be accurately and quickly removed.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: March 16, 1999
    Assignee: City of Hope
    Inventors: David Z. J. Chu, Todd McCarty