Patents by Inventor T. Graham Christopher

T. Graham Christopher 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).

  • Urinary catheter with collapsible urethral tube
    Patent number: 4710169
    Abstract: An indwelling urinary catheter having semi-rigid tubular portions for holding open the entrance of the bladder and the urethral exit and a collapsible tubular portion extending through the urethra. The collapsible tube is closed by the normal urethral mechanism and opened upon the flow of urine, thus blocking bacterial migration into the body and avoiding abnormal, continuous distention of the urethra and consequent discomfort to the patient. Avoided, as well, is the transmission of infection occasioned by the sliding motion of rigid-tube catheters within the urethra.
    Type: Grant
    Filed: December 11, 1985
    Date of Patent: December 1, 1987
    Inventor: T. Graham Christopher
  • Urinary catheter with collapsible urethral tube
    Patent number: 4571241
    Abstract: An indwelling urinary catheter having a rigid tubular portion for holding open the entrance of the bladder and a collapsible tubular portion extending through the urethra. The collapsible tube is closed by the normal urethral mechanism and opened upon the flow of urine, thus blocking bacterial migration into the body and avoiding abnormal, continuous distention of the urethra and consequent discomfort to the patient. Avoided, as well, is the transmission of infection occasioned by the sliding motion of rigid tube catheters within the urethra.
    Type: Grant
    Filed: December 16, 1983
    Date of Patent: February 18, 1986
    Inventor: T. Graham Christopher