Patents by Inventor Norman C. Crandall

Norman C. Crandall 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: 4315505
    Abstract: A tracheostomy tube includes an outer cannula and a removable, disposable inner cannula. The inner cannula is provided with a tapered portion located just behind its distal tip which forms simultaneously an air tight seal with the outer cannula and a stop device for preventing the protrusion of the tip substantially beyond the end of the outer cannula. The stop device furthermore compensates for variations in the length of the inner cannula by controlling the position of the tip between a location flush with the end of the outer cannula and one just slightly beyond. A coupling connector is mounted on the proximal end of the inner cannula to provide easy, releasable attachment of the inner cannula to the outer cannula. The inner cannulae are inexpensively constructed from a soft, flexible polyvinyl chloride material and are dimensionally compatible with any particular outer cannula.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: February 16, 1982
    Assignee: Shiley, Inc.
    Inventors: Norman C. Crandall, Robert C. French
  • Patent number: 4009720
    Abstract: A wedge-like seal for use with a tracheotomy tube having an inner cannula and an outer cannula. The seal is integrally formed within the outer end of the inner cannula to provide a tight seal engagement between the inner cannula and the outer cannula as well as between the coupling connector and the inner cannula. Incorporated in the seal is a circular sealing ridge from which depend two frusto-conical shaped sealing surfaces extending in opposite directions from the central ridge. The seal minimizes the force necessary to establish as well as to disengage the sealing contact between the respective tracheotomy tube parts, eliminating possible discomfort to the patient.
    Type: Grant
    Filed: August 14, 1975
    Date of Patent: March 1, 1977
    Assignee: Shiley Laboratories, Inc.
    Inventor: Norman C. Crandall
  • Patent number: D255833
    Type: Grant
    Filed: May 26, 1978
    Date of Patent: July 8, 1980
    Assignee: Shiley Incorporated
    Inventor: Norman C. Crandall