Patents Assigned to High Voltage Engineering Corporation
  • Catheter and the method of making
    Patent number: 4055682
    Abstract: A silicone catheter is rendered hydrophilic by contacting it with N-vinyl pyrrolidone (NVP) in bulk or in solution and exposing the catheter and NVP to ionizing radiation at high dose rate. Penetration of the NVP beyond a thin surface layer is prevented by controlling the dose of ionizing radiation and the concentration of NVP.
    Type: Grant
    Filed: March 25, 1976
    Date of Patent: October 25, 1977
    Assignee: High Voltage Engineering Corporation
    Inventor: Edward Wilson Merrill