Patents by Inventor John W. Egolf, Jr.

John W. Egolf, Jr. 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).

  • Method of producing catheter assemblies for prevention of blood leakage
    Patent number: 5156792
    Abstract: A catheter is provided which deters the backflow of blood between the insertion needle and the catheter cannula by forming the distal end of the catheter hub so as to restrict the inner diameter of the catheter cannula to a wiping fit with the engaged insertion needle. In a first embodiment the distal end of the catheter hub is pre-formed to its desired final inner dimension. The distal end of the hub is stretched to an oversize condition, the catheter cannula is attached to the hub, and the distal end of the catheter hub is heated, causing a stress relief of the previously stretched hub. The distal end of the catheter hub returns to its pre-formed dimension which will mechanically restrict the diameter of the catheter cannula at that point to form the wiping fit with the engaged needle.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: October 20, 1992
    Assignee: Critikon, Inc.
    Inventors: Richard G. Holdaway, Julian E. Cannon, Gordon W. Horgen, Anthony Y. Van Heugten, John W. Egolf, Jr.
  • Catheter assemblies for prevention of blood leakage
    Patent number: 5030205
    Abstract: A catheter is provided which deters the backflow of blood between the insertion needle and the catheter cannula by forming the distal end of the catheter hub so as to restrict the inner diameter of the catheter cannula to a wiping fit with the engaged insertion needle. In a first embodiment the distal end of the catheter hub is pre-formed to its desired final inner dimension. The distal end of the hub is stretched to an oversize condition, the catheter cannula is attached to the hub, and the distal end of the catheter hub is heated, causing a stress relief of the previously stretched hub. The distal end of the catheter hub returns to its pre-formed dimension which will mechanically restrict the diameter of the catheter cannula at that point to form the wiping fit with the engaged needle.
    Type: Grant
    Filed: December 18, 1989
    Date of Patent: July 9, 1991
    Assignee: Critikon, Inc.
    Inventors: Richard G. Holdaway, Julian E. Cannon, Gordon W. Horgen, Anthony Y. Van Heugten, John W. Egolf, Jr.