Patents by Inventor Bandula Wijayarathna

Bandula Wijayarathna 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).

  • Patent number: 4563181
    Abstract: An intravascular catheter, such as an angiography catheter, has a tubular body portion formed from a nylon such as nylon-11 which has strength and stiffness characteristics providing excellent torqueability, burst strength, and longitudinal rigidity. A soft tubular tip is fused to the end of the body portion to form a continuous tubular catheter. The soft tip is formed from a blend of the nylon of the body portion with an ester linked polyether-polyamide co-polymer which is soft and rubbery to render the tip soft to avoid injury to a blood vessel.
    Type: Grant
    Filed: February 18, 1983
    Date of Patent: January 7, 1986
    Assignee: Mallinckrodt, Inc.
    Inventors: Bandula Wijayarathna, Ronald M. Hopkins
  • Patent number: 4464176
    Abstract: A catheter which is capable of delivering medicine into a blood vessel at a selected point, such as into a coronary artery, includes an outer tube which is joined to the outside diameter of an inner tube by drawing the tubes through a heated die. A distal portion of the outer tube extends beyond the distal end of the inner tube, and the outer tube is formed from a polymeric material having a substantially lower flexural modulus than the polymeric material of the inner tube so that the distal portion is relatively flexible for enabling insertion in a tortuous blood vessel. The inner diameters of the inner tube and the distal portion of the outer tube permit insertion of a guide wire therethrough for aiding in the insertion of the catheter.
    Type: Grant
    Filed: June 4, 1982
    Date of Patent: August 7, 1984
    Assignee: Mallinckrodt, Inc.
    Inventor: Bandula Wijayarathna