Patents by Inventor Premnath Venugopalan

Premnath Venugopalan 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).

  • Radiation and melt treated ultra high molecular weight polyethylene prosthetic devices
    Publication number: 20050010288
    Abstract: A medical prosthesis for use within the body which is formed of radiation treated ultra high molecular weight polyethylene having substantially no detectable free radicals, is described. Preferred prostheses exhibit reduced production of particles from the prosthesis during wear of the prosthesis, and are substantially oxidation resistant. Methods of manufacture of such devices and material used therein are also provided.
    Type: Application
    Filed: October 30, 2003
    Publication date: January 13, 2005
    Inventors: Edward Merrill, William Harris, Murali Jasty, Charles Bragdon, Daniel O'Connor, Premnath Venugopalan
  • Radiation and melt treated ultra high molecular weight polyethylene prosthetic devices
    Patent number: 6786933
    Abstract: A medical prosthesis for use within a body which is formed of radiation treated ultra high molecular weight polyethylene having substantially no detectable free radial. Preferred prosthesis exhibits reduced production of particles from the prosthesis during wear of the prosthesis, and are substantially oxidation resistant. Methods of manufacturing wear resistant medical prosthesis and materials used therein are also provided.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: September 7, 2004
    Assignees: The General Hospital Corporation, Massachusetts Institute of Technology
    Inventors: Edward W. Merrill, William H. Harris, Murali Jasty, Orhun Muratoglu, Charles R. Bragdon, Daniel O. O'Connor, Premnath Venugopalan
  • Radiation and melt treated ultra high molecular weight polyethylene prosthetic device and method
    Patent number: 6641617
    Abstract: A medical prosthesis for use within the body which is formed of radiation treated ultra high molecular weight polyethylene having substantially no detectable free radicals, is described. Preferred prostheses exhibit reduced production of particles from the prosthesis during wear of the prosthesis, and are substantially oxidation resistant. Methods of manufacture of such devices and material used therein are also provided.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: November 4, 2003
    Assignees: The General Hospital Corp., Massachusetts Institute of Technology
    Inventors: Edward W. Merrill, William H. Harris, Murali Jasty, Orhun Muratoglu, Charles R. Bragdon, Daniel O. O'Connor, Premnath Venugopalan
  • Radiation and melt treated ultra high molecular weight polyethylene prosthetic devices
    Publication number: 20030119935
    Abstract: A medical prosthesis for use within the body which is formed of radiation treated ultra high molecular weight polyethylene having substantially no detectable free radicals, is described. Preferred prostheses exhibit reduced production of particles from the prosthesis during wear of the prosthesis, and are substantially oxidation resistant. Methods of manufacture of such devices and material used therein are also provided.
    Type: Application
    Filed: July 18, 2002
    Publication date: June 26, 2003
    Inventors: Edward W. Merrill, William H. Harris, Murali Jasty, Orhun Muratoglu, Charles R. Bragdon, Daniel O. O'Connor, Premnath Venugopalan
  • Radiation and melt treated ultra high molecular weight polyethylene prosthetic devices
    Publication number: 20030105182
    Abstract: A medical prosthesis for use within the body which is formed of radiation treated ultra high molecular weight polyethylene having substantially no detectable free radicals, is described. Preferred prostheses exhibit reduced production of particles from the prosthesis during wear of the prosthesis, and are substantially oxidation resistant. Methods of manufacture of such devices and material used therein are also provided.
    Type: Application
    Filed: July 18, 2002
    Publication date: June 5, 2003
    Inventors: Edward W. Merrill, William H. Harris, Murali Jasty, Orhun Muratoglu, Charles R. Bragdon, Daniel O. O'Connor, Premnath Venugopalan
  • Radiation and melt treated ultra high molecular weight polyethylene prosthetic device
    Publication number: 20030013781
    Abstract: A medical prosthesis for use within the body which is formed of radiation treated ultra high molecular weight polyethylene having substantially no detectable free radicals, is described. Preferred prostheses exhibit reduced production of particles from the prosthesis during wear of the prosthesis, and are substantially oxidation resistant. Methods of manufacture of such devices and material used therein are also provided.
    Type: Application
    Filed: July 18, 2002
    Publication date: January 16, 2003
    Inventors: Edward W. Merrill, William H. Harris, Murali Jasty, Orhun Muratoglu, Charles R. Bragdon, Daniel O. O'Connor, Premnath Venugopalan
  • Process of making ultra high molecular weight polyethylene prosthetic devices
    Patent number: 6464926
    Abstract: The present invention relates to a medical prosthesis for use within the body, which is formed of ultra high molecular weight polyethylene having a polymeric structure with less than about 50% crystallinity, less than about 290 Å lamellar thickness and less than about 940 MPa tensile elastic modulus, so as to reduce production of fine particles from the prosthesis during wear of the prosthesis. The present invention also relates to methods of manufacture of such devices and material used therein.
    Type: Grant
    Filed: April 4, 2000
    Date of Patent: October 15, 2002
    Assignees: The General Hospital Corporation, Massachusetts Institute of Technology
    Inventors: Edward W. Merrill, William H. Harris, Premnath Venugopalan, Murali Jasty, Charles R. Bragdon, Daniel O. O'Connor
  • Radiation and melt treated ultra high molecular weight polyethylene prosthetic devices
    Publication number: 20020007219
    Abstract: A medical prosthesis for use within the body which is formed of radiation treated ultra high molecular weight polyethylene having substantially no detectable free radicals, is described. Preferred prostheses exhibit reduced production of particles from the prosthesis during wear of the prosthesis, and are substantially oxidation resistant. Methods of manufacture of such devices and material used therein are also provided.
    Type: Application
    Filed: January 19, 2001
    Publication date: January 17, 2002
    Inventors: Edward W. Merrill, William H. Harris, Murali Jasty, Orhun Muratoglu, Charles R. Bragdon, Daniel O. O'Connor, Premnath Venugopalan
  • Radiation and melt treated ultra high molecular weight polyethylene prosthetic devices
    Publication number: 20010027345
    Abstract: A medical prosthesis for use within the body which is formed of radiation treated ultra high molecular weight polyethylene having substantially no detectable free radicals, is described. Preferred prostheses exhibit reduced production of particles from the prosthesis during wear of the prosthesis, and are substantially oxidation resistant. Methods of manufacture of such devices and material used therein are also provided.
    Type: Application
    Filed: April 26, 2001
    Publication date: October 4, 2001
    Inventors: Edward W. Merrill, William H. Harris, Murali Jasty, Orhun Muratoglu, Charles R. Bragdon, Daniel O. O'Connor, Premnath Venugopalan
  • Melt-irradiated ultra high molecular weight polyethylene prosthetic devices
    Patent number: 5879400
    Abstract: A medical prosthesis for use within the body which is formed of ultra high molecular weight polyethylene which has a polymeric structure with less than about 50% crystallinity, less than about 290 .ANG. lamellar thickness and less than about 940 MPa tensile elastic modulus, so as to reduce production of fine particles from the prosthesis during wear of the prosthesis, is described. Methods of manufacture of such devices and material used therein are also provided.
    Type: Grant
    Filed: February 13, 1996
    Date of Patent: March 9, 1999
    Assignees: Massachusetts Institute of Technology, The General Hospital Corporation
    Inventors: Edward W. Merrill, William H. Harris, Premnath Venugopalan, Murali Jasty, Charles R. Bragdon, Daniel O. O'Connor