Patents by Inventor Donald W. Hegeman

Donald W. Hegeman 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).

  • Publication number: 20030235481
    Abstract: A torque lock/indicator including first and second members and a compression ring for sealingly contacting a surface of the first member. The first member has first and second contact surfaces and structure for generally axially accommodating a connector. The second member has a ring member and a plurality of extensions extending from the ring member, each extension has an angled first contact surface and a second contact surface proximate the first contact surface. The connector is tightened until the compression ring is compressed to a predetermined degree. As the compression ring is being compressed the first member first contact surface is slidingly displaced against the second member contact surface. When the connector has been tightened to a predetermined level of torque, the first member first contact surface has been displaced past the second member first contact surface and the first member second contact surface strikes the second member second contact surface generating a mechanical vibration.
    Type: Application
    Filed: March 27, 2003
    Publication date: December 25, 2003
    Inventors: Matthew J. Dunfee, Donald G. Chase, David A. Gosewisch, Donald W. Hegeman, David D. Schneider, Timothy J. Walker
  • Publication number: 20020076296
    Abstract: A torque lock/indicator including an upper member, and lower member and a compression ring disposed between the upper and lower members. The upper member has at least one extension with an angled contact surface and a locking surface proximate the locking surface. The lower member has an angled, substantially peripheral contact surface and a locking surface proximate the contact surface. An optional cap is provided which is secured to the upper member or the lower member by being interlocked or cemented thereto.
    Type: Application
    Filed: August 27, 2001
    Publication date: June 20, 2002
    Inventors: Matthew J. Dunfee, Donald G. Chase, David A. Gosewisch, Donald W. Hegeman, David D. Schneider
  • Patent number: 6293752
    Abstract: A biological fluid transport device comprises a cutwater at the junction of at least two blood flow paths. The cutwater is substantially straight, substantially vertical, or both. At least one of the fluid paths may be tubular, and in some embodiments all of the fluid paths are tubular. The shear sensitive fluid may be, without limitation, blood, blood-based combinations, cell culture media, cell suspensions, proteins, and microcapsule suspensions. The device may be part of an extracorporeal circuit (e.g., blood during heart-lung bypass procedures or blood processing), but it need not be. Preferred embodiments of the device include, without limitation, kinetic pumps, mass transfer devices, filters, reservoirs, and heat exchangers.
    Type: Grant
    Filed: March 9, 1999
    Date of Patent: September 25, 2001
    Inventors: Cynthia T. Clague, Frank D. Dorman, Robert C. Hamlen, Donald W. Hegeman, III, Timothy A. Miller, Joseph E. Poissant, Richard T. Stone, Michael P Sullivan
  • Patent number: 5971023
    Abstract: A biological fluid transport device comprises a cutwater at the junction of at least two blood flow paths. The cutwater is substantially straight, substantially vertical, or both. At least one of the fluid paths may be tubular, and in some embodiments all of the fluid paths are tubular. The shear sensitive fluid may be, without limitation, blood, blood-based combinations, cell culture media, cell suspensions, proteins, and microcapsule suspensions. The device may be part of an extracorporeal circuit (e.g., blood during heart-lung bypass procedures or blood processing), but it need not be. Preferred embodiments of the device include, without limitation, kinetic pumps, mass transfer devices, filters, reservoirs, and heat exchangers.
    Type: Grant
    Filed: February 12, 1997
    Date of Patent: October 26, 1999
    Assignee: Medtronic, Inc.
    Inventors: Cynthia T. Clague, Frank D. Dorman, Robert C. Hamlen, Donald W. Hegeman, III, Timothy A. Miller, Joseph E. Poissant, Richard T. Stone, Michael P. Sullivan