Patents by Inventor Philip L. Ritger

Philip L. Ritger 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: 6217560
    Abstract: Disclosed herein is a luer connector which exhibits an improved engagement force, in comparison to a standard luer connector, when a fluid contaminant is present between the contact surfaces of mated luer fitments. The luer connector of the present invention comprises a textured contact surface which is adapted to trap or channel fluid contaminants away from the contact surfaces of mated luer fitments. Also disclosed herein is a method of making a luer connector with a textured contact surface.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: April 17, 2001
    Inventors: Philip L. Ritger, Miguel Leon
  • Patent number: 6008429
    Abstract: Disclosed herein is a three layered wound dressing delivery system comprising a release layer, and adhesive layer, and a protective layer. The release layer is provided with a cut separating the release layer into two portions. A hinge strip is adhered to the protective layer and release layer along at least one of the lateral edges of their lateral edges.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: December 28, 1999
    Inventor: Philip L. Ritger
  • Patent number: 5851201
    Abstract: Disclosed herein is a luer connector which exhibits an improved engagement force, in comparison to a standard luer connector, when a fluid contaminant is present between the contact surfaces of mated luer fitments. The luer connector of the present invention comprises a textured contact surface which is adapted to trap or channel fluid contaminants away from the contact surfaces of mated luer fitments. Also disclosed herein is a method of making a luer connector with a textured contact surface.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: December 22, 1998
    Assignee: Acacia Laboratories, Inc.
    Inventors: Philip L. Ritger, Miguel Leon
  • Patent number: 5338512
    Abstract: A device including an integrally formed membrane oxygenator and heat exchange device positioned in a single housing. The device includes a thermally conductive body formed with a plurality of blood pathways on its surface, and a gas permeable membrane, or membranes positioned in the housing in substantial contact with the heat exchange body to cover or lie within a portion of each of the pathways. The membrane defines a gas pathway separate from the blood pathway through which a gas is directed. The blood is directed through the individual blood pathways. The device also includes various ports and passageways for delivering the blood to the individual channels, and for collecting and removing the blood from the device.
    Type: Grant
    Filed: March 2, 1993
    Date of Patent: August 16, 1994
    Assignee: Baxter International Inc.
    Inventors: Wilfred F. Mathewson, Richard L. Bringham, Philip L. Ritger, David L. Karshmer
  • Patent number: 5316724
    Abstract: A membrane oxygenator designed to provide blood flow evenly across a gas permeable membrane in a direction substantially perpendicular to the longitudinal direction of the gas permeable membrane. In particular, the present invention is directed to a membrane oxygenator wherein the blood is distributed substantially evenly and at a substantially constant velocity, in a cross-wise direction across the gas permeable membrane. In accordance with a preferred embodiment, the membrane is a bundle of gas permeable hollow fibers with the blood being distributed in a direction substantially perpendicular to the longitudinal direction of the individual hollow fiber membranes.
    Type: Grant
    Filed: September 15, 1992
    Date of Patent: May 31, 1994
    Assignee: Baxter International Inc.
    Inventors: Wilfred F. Mathewson, Richard L. Bringham, Philip L. Ritger, David Karshmer
  • Patent number: 5236665
    Abstract: A hollow fiber membrane fluid treatment apparatus for the transfer of mass or energy through the membrane is disclosed. It is designed particularly, but not only, for use in membrane oxygenators. Hollow fiber membranes extend substantially longitudinally, first inert fibers are spaced between them and also extend substantially longitudinally. Second inert fibers extend generally transverse to the hollow fibers and generally contiguous therewith, so that a first fluid (preferably an oxygen-containing gas) can pass through the hollow fibers and a second fluid (preferably blood) can be passed over their exterior for mass or energy transfer through the membrane.
    Type: Grant
    Filed: November 4, 1992
    Date of Patent: August 17, 1993
    Assignee: Baxter International Inc.
    Inventors: Wilfred F. Mathewson, Philip L. Ritger
  • Patent number: 5232437
    Abstract: Methods and systems for collection of blood components, such as plasma, from donors are provided. One method includes the steps of collecting a unit of whole blood from a donor; forcing the collected blood unit through a plasma separator; accumulating the plasma in a container; and returning concentrated cells to the donor. One system includes a disposable blood collection set and a reusable fixture into which the collection set can be mounted. The fixture is operated by a self-contained energy source, requiring no exterior electrical connection or other external source of energy.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: August 3, 1993
    Assignee: Baxter International Inc.
    Inventors: Michael J. Lysaght, Daniel R. Boggs, Philip L. Ritger, Robert R. Stromberg, Leonard I. Friedman
  • Patent number: 5225161
    Abstract: A device including an integrally formed membrane oxygenator and heat exchange device positioned in a single housing. The device includes a thermally conductive body formed with a plurality of blood pathways on its surface, and a gas permeable membrane, or membranes positioned in the housing in substantial contact with the heat exchange body to cover or lie within a portion of each of the pathways. The membrane defines a gas pathway separate from the blood pathway through which a gas is directed. The blood is directed through the individual blood pathways. The device also includes various ports and passageways for delivering the blood to the individual channels, and for collecting and removing the blood from the device.
    Type: Grant
    Filed: March 10, 1992
    Date of Patent: July 6, 1993
    Assignee: Baxter International Inc.
    Inventors: Wilfred F. Mathewson, Richard L. Bringham, Philip L. Ritger, David L. Karshmer
  • Patent number: 5120501
    Abstract: A device including an integrally formed membrane oxygenator and heat exchange device positioned in a single housing. The device includes a thermally conductive body formed with a plurality of blood pathways on its surface, and a gas permeable membrane, or membranes positioned in the housing in substantial contact with the heat exchange body to cover or lie within a portion of each of the pathways. The membrane defines a gas pathway separate from the blood pathway through which a gas is directed. The blood is directed through the individual blood pathways. The device also includes various ports and passageways for delivering the blood to the individual channels, and for collecting and removing the blood from the device.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: June 9, 1992
    Assignee: Baxter International Inc.
    Inventors: Wifred F. Mathewson, Richard L. Bringham, Philip L. Ritger, David Karshmer
  • Patent number: 4964976
    Abstract: A method and apparatus for optimizing parameters of a hollow membrane filter results in a relatively small filter when a predetermined, substantially constant, driving pressure drop is applied between the inlet and the outlet of the filter. The method includes simultaneous solution of a set of equations to specify fiber length, number and internal diameter. A system including a computer can make optimized filters in response to the determined parameters.
    Type: Grant
    Filed: February 1, 1990
    Date of Patent: October 23, 1990
    Inventors: Michael J. Lysaght, Daniel R. Boggs, Philip L. Ritger
  • Patent number: 4911703
    Abstract: Methods and systems for collection of blood components, such as plasma, from donors are provided. One method includes the steps of collecting a unit of whole blood froma donor; forcing the collected blood unit through a plasma separator; accumulating the plasma in a container; and returning concentrated cells to the donor. One system includes a disposable blood collection set and a reusable fixture into which the collection set can be mounted. The fixture is operated by a self-contained energy source, requiring no exterior electrical connection or other external source of energy.
    Type: Grant
    Filed: January 12, 1989
    Date of Patent: March 27, 1990
    Assignees: Baxter International Inc., American National Red Cross
    Inventors: Michael J. Lysaght, Daniel R. Boggs, Philip L. Ritger, Robert R. Stromberg, Leonard I. Friedman
  • Patent number: 4842576
    Abstract: A system for generating substantially constant fluid pressure is provided for forcing fluid from a variable volume container. The system includes a roller that rotates in response to a constant applied torque to force fluid from the flexible container under a substantially constant pressure. Two spaced apart parallel rollers can exert force on both sides of the container.
    Type: Grant
    Filed: October 15, 1986
    Date of Patent: June 27, 1989
    Assignee: Baxter International Inc.
    Inventors: Michael J. Lysaght, Daniel R. Boggs, Philip L. Ritger