Patents by Inventor Dongxu Piao

Dongxu Piao 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).

  • High-water-containing elastomer medical catheter
    Patent number: 5985394
    Abstract: The present invention provides a process for preparing; a high water-containing elastomer medical catheter and a urinary catheter prepared by the process. The process comprises a) heating a mixture consisting of polyvinyl alcohol, water, sulfoxide and linear alkane, in a sealed vessel with agitating; b) pouring the resulting homogeneous fluid into a mould; c) solidifying the fluid by cooling; d) releasing the solidified fluid from the mould; and e) heat-treating the resulting medical catheter and washing with a polar organic solvent. The medical catheter and the urinary catheter of the present invention have excellent lubricity.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: November 16, 1999
    Assignee: China Rehabilitation Research Center
    Inventors: Lijiang Mao, Yuanjie Hu, Dongxu Piao
  • Process for preparing high water-containing elastomer medical catheter
    Patent number: 5688459
    Abstract: The present invention provides a process for preparing a high water-containing elastomer medical catheter and a urinary catheter prepared by the process. The process is carried out by a) heating a mixture consisting of polyvinyl alcohol, water, sulfoxide and linear alkane, in a sealed vessel with agitating; b) pouring the resulting homogeneous fluid into a mould; c) solidifying the fluid by cooling; d) releasing the solidified fluid from the mould; and e) heat-treating the resulting medical catheter and washing with a polar organic solvent. The medical catheter and the urinary catheter of the present invention have excellent lubricity.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: November 18, 1997
    Assignee: Chin Rehabilitation Research Center
    Inventors: Lijiang Mao, Yuanjie Hu, Dongxu Piao