Patents by Inventor William J. Schnell

William J. Schnell 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: 6177049
    Abstract: A tubular set is provided for the extracorporeal treatment of blood, for example hemodialysis. The set comprises a patient arterial line and a patient venous line, each line having a patient connector at one end thereof. Each patient line connects at its other end to a reversing flow valve. The valve also connects to respective first ends of a blood processing unit arterial line and a blood processing unit venous line. Each of the unit lines carry a connector at ends opposed to the first ends for connection respectively to arterial and venous ports of a blood processing device, typically a dialyzer. The reversing flow valve has a first position that respectively connects the patient and unit arterial lines with the patient and unit venous lines. The reversing flow valve has a second position that connects the patient arterial line with the unit venous line, and the unit arterial line with the patient venous line.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: January 23, 2001
    Assignee: DSU Medical Corporation
    Inventors: William J. Schnell, David S. Utterberg, Ting Ting Yu
  • Patent number: 6171484
    Abstract: A flow through bubble trap for fluid flow lines comprises a chamber-defining wall and a flow inlet/outlet tube at least substantially extending through the chamber and open at opposed tube ends to respectively define an inlet and an outlet of the bubble trap. The tube defines a flow inlet port and a flow outlet port within the chamber interior. A flow blocking partition closes the bore of the tube between the flow inlet and outlet ports. Additionally, the chamber defining wall carries a retaining-sealing member for removable, sealing connection with a tube connector of a fluid flow line. The retaining-sealing member is free of fluid flow connection with the interior of the chamber defined by the wall, and thus serves as a seal for connectors on tube ends of a set carrying the bubble trap. Also, the chamber defining wall has a bottom wall that defines a third port.
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: January 9, 2001
    Assignee: DSU Medical Corporation
    Inventors: William J. Schnell, David S. Utterberg
  • Patent number: 6117342
    Abstract: An extracorporeal, flow-through bubble trap for blood lines having improved capabilities at high flow rates and with smaller bubbles. The bubble trap comprises a chamber-defining wall, plus a blood inlet and a blood outlet, each extending through the wall to communicate with the interior of the chamber. The blood outlet connects with the chamber interior adjacent the bottom thereof. The chamber interior has a height that is less than 1.6 times the longest horizontal dimension of the chamber interior. As a result of this, blood flow in the bubble trap chamber is substantially horizontal.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: September 12, 2000
    Assignee: Medisystems Technology Corporation
    Inventors: William J. Schnell, David S. Utterberg
  • Patent number: 6113062
    Abstract: A squeeze clamp for flexible tubing comprises a strip of plastic which is bent back on itself so that the ends are adjacent to each other. The strip defines a pair of spaced apertures to permit a flexible tube to extend through and be carried by the clamp. First and second latches at the respective ends can hold the clamp in a closed position, or it can spring outwardly into an open position. The apertures extend laterally through a first side edge of the strip, with the apertures thus being each located next to a narrow strip portion connected to wider strip portions on either side of the narrow strip portion. At least one of the narrow strip portions extends laterally outwardly beyond the side edge of the rest of the plastic strip for strengthening of the narrow strip portion, to reduce problems of involuntary twisting or torsion as the clamp is closed.
    Type: Grant
    Filed: January 28, 1999
    Date of Patent: September 5, 2000
    Assignee: DSU Medical Corporation
    Inventors: William J. Schnell, David S. Utterberg
  • Patent number: 6090066
    Abstract: An injection site for passing a needle into an enclosed space surrounded by a wall, typically defined by a tubular section incorporated in a tubular set. An aperture in the wall communicates between the enclosed space and the exterior, having an elastic, needle-pierceable member such as a plug occluding the aperture. The plug is exposed to the exterior on one side and defines a route of needle access through the plug and aperture to the enclosed space. A first flange is positioned adjacent to the plug and extends transversely outwardly from the plug. The first flange carries a second flange, which extends longitudinally relative to the plug, and is spaced transversely outwardly from the plug to define a catch area for needles, which catch area surrounds the plug.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: July 18, 2000
    Assignee: DSU Medical Corporation
    Inventor: William J. Schnell
  • Patent number: 6071269
    Abstract: A combined arterial-venous blood flow set comprises connected lengths of flexible tubing for receiving blood from a patient, for conveying the blood to a blood processing device such as a dialyzer or an LDL filter, and for returning the blood to the patient. An optional first bubble trap chamber is connected in series flow between two of the lengths of tubing at a flow position downstream from the patient and upstream from the blood processing device. A second bubble trap chamber is connected in series flow between two of the lengths of tubing at a flow position downstream from the blood processing device and upstream from the patient. A first portion of the tubing which is in a flow position upstream from the blood processing device extends by the second bubble trap chamber, and is physically, laterally connected to it without direct flow connection. This helps to stabilize the positioning of components of the flow set and to reduce confusion in set-up and priming.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: June 6, 2000
    Assignee: Medisystems Technology Corporation
    Inventors: William J. Schnell, David S. Utterberg
  • Patent number: 6051134
    Abstract: A flow through bubble trap comprises a chamber-defining wall having a flow inlet/outlet tube extending through the chamber and open at opposed tube ends. The tube has its bore closed with a partition, with ports in the side wall communicating with the chamber interior on opposite sides of the partition and adjacent to the bottom wall of the chamber.
    Type: Grant
    Filed: May 26, 1999
    Date of Patent: April 18, 2000
    Assignee: Medisystems Technology Corporation
    Inventors: William J. Schnell, David S. Utterberg
  • Patent number: 6042570
    Abstract: A needle point protection sheath comprises a protector tube having a bore for receiving a hollow needle plus a needle hub within the bore. The protector tube has a closure cap at one end thereof and has a retention member at the other end to engage an end of the hub, to prevent the hub from passing out of the other tube end. The cap may carry a sleeve having a needle-pierceable wall at its inner end, or a mass of resilient material which is capable of being penetrated by the needle as the cap is closed, to seal the needle tip and thus prevent the spilling of blood residue when a blood collection needle is being enclosed for protection.
    Type: Grant
    Filed: February 11, 1999
    Date of Patent: March 28, 2000
    Assignee: DSU Medical Corporation
    Inventors: David Bell, William J. Schnell
  • Patent number: 6019824
    Abstract: A tubular set for the conveyance of blood includes flexible set tubing and a bubble trap chamber connected to the tubing for any desired extracorporeal blood transport process. The bubble trap chamber includes a housing defining an outer wall, a flow inlet to the interior of the housing, and a flow outlet at or near the bottom of the housing. The housing also includes an inner wall adjacent to its top. The inner wall is radially inwardly spaced from the outer wall within the chamber, extending circumferentially and generally parallel to the outer wall for at least about 90.degree. of the circumference of the outer wall and preferably at least 180.degree., to define a circumferential passageway between the inner and outer walls. The flow inlet communicates with the circumferential passageway, so that blood can be directed to flow from the inlet horizontally and circumferentially through the passageway to a pair of passageway outlets.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: February 1, 2000
    Assignee: Medisystems Technology Corporation
    Inventor: William J. Schnell
  • Patent number: 6010623
    Abstract: A flow through bubble trap for fluid flow lines comprises a chamber having a substantially flat, lateral side, a first port tube, and a second, opposed port tube. A flow directing baffle system is positioned in the chamber to direct incoming fluid from one of the port tubes into a first, lateral flow direction to allow substantially horizontal fluid flow circulation in the chamber. Fluid flow from the circulating fluid in the chamber enters into the other of the port tubes in a lateral flow direction that is generally the same as the first lateral flow direction, while the baffle system prevents direct flow between the first and second port tubes. The chamber is adaptable to fit with a large variety of conventional dialysis machines and the like, having multi-purpose supplemental access ports, for a simplification of the number of codes necessary for product distribution.
    Type: Grant
    Filed: May 5, 1998
    Date of Patent: January 4, 2000
    Assignee: Medisystems Technology Corporation
    Inventors: William J. Schnell, David S. Utterberg
  • Patent number: 5980741
    Abstract: A flow through bubble trap for fluid flow lines comprises a chamber having a substantially flat, lateral side, a first port tube, and a second, opposed port tube. A flow directing baffle system is positioned in the chamber to direct incoming fluid from one of the port tubes into a first, lateral flow direction to allow substantially horizontal fluid flow circulation in the chamber. Fluid flow from the circulating fluid in the chamber enters into the other of the port tubes in a lateral flow direction that is generally the same as the first lateral flow direction, while the baffle system prevents direct flow between the first and second port tubes. The chamber is adaptable to fit with a large variety of conventional dialysis machines and the like, having multi-purpose supplemental access ports, for a simplification of the number of codes necessary for product distribution.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: November 9, 1999
    Assignee: Medisystems Technology Corporation
    Inventors: William J. Schnell, David S. Utterberg
  • Patent number: 5772638
    Abstract: A medical needle protector sheath having slotted sidewalls to receive a winged needle. The sidewalls define at least one catch projection and preferably one in each sidewall, spaced from closed ends of the slots in the sidewalls, to prevent needle wings occupying the sheath adjacent the closed ends from easily sliding away. The catch projection defines an elongated member having a first end that defines a wing catching tip extending into one of the slots. The elongated member is attached to the sidewall only at an elongated member end that is opposed to the first end. This permits the elongated member to flex in the sidewall plane, providing improved receipt and retention of the needle wings.
    Type: Grant
    Filed: September 17, 1996
    Date of Patent: June 30, 1998
    Assignee: Medisystems Technology Corporation
    Inventors: David S. Utterberg, William J. Schnell
  • Patent number: 5704924
    Abstract: A medical needle protector sheath which comprises a body having a top wall, side walls, an open first end, and slot formed in each side wall to receive a needle wing extending through each of the slots. The slots extend from the first end toward a second sheath end opposed to the first end, with the slots terminating in the side walls at end points which are spaced from the second end. Typically, first portions of the slots adjacent to the end points slope away from the top wall as the slots extend toward the second end. Other portions of the slots slope toward the top wall as the slots extend to the second end. Various improvements are described which result in safer-and easier use of the needle protector sheath.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: January 6, 1998
    Assignee: Medisystems Technology Corporation
    Inventors: David S. Utterberg, William J. Schnell
  • Patent number: 5569298
    Abstract: A surgical instrument has a hollow elongated shaft for insertion into the body, the shaft having a longitudinal axis and supporting a pair of interacting pivotable jaws on its distal end and being connected at its proximal end to a first movable component of an operating handle, with a reciprocable rod located within the shaft. The rod is connected to a second movable component of the handle for reciprocation within the shaft when the first and second components are moved relative to each other. The jaws are pivotally connected by a pivot pin supported on the shaft transversely to the axis. Each of the jaws has a proximal end extending proximally from the pivot pin. Each of the proximal ends is provided with an elongated opening therethrough, each the openings forming an elongated slot oriented at an oblique angle relative to the longitudinal axis of the shaft. The reciprocable rod has a distal end extending into each slot whereby reciprocation of the rod causes the jaws to open and close.
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: October 29, 1996
    Inventor: William J. Schnell
  • Patent number: 5088995
    Abstract: A port and closure assembly for a container is provided. The port and closure assembly includes a port having a tubular portion that extends from a base and terminates at an end including an opening. The tubular portion is divided into an upper and lower section by a pierceable membrane. The upper section including an end that terminates at the opening and including a resealing injection site. A closure member for removably surrounding at least a portion of the end of the port including the opening is provided. The closure includes a sleeve that circumscribes at least a portion of an outer surface of the upper section of the tubular portion. The sleeve is so constructed and arranged as to cause portions of the upper section to contact the resealing member during a sterilization step that softens the portions and further causes the portions of the upper section to retain the resealing injection site within the tubular portion after the portions have hardened.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: February 18, 1992
    Assignee: Baxter International Inc.
    Inventors: Jeffrey Packard, William J. Schnell, Michael W. Scharf
  • Patent number: 4983178
    Abstract: An integrated lancing device comprises a generally U-shaped spring member defining a pair of arms having free ends. A lance blade is carried in transverse position on one of the arms adjacent the free end, the one arm defining a trigger projection typically positioned substantially along the axis of the one arm. The other of the pair of arms carries a trigger member as an integral part thereof, with the trigger member extending toward the trigger projection. The arms may be flexed outwardly into a cocked position and held there by engagement of the trigger projection and trigger member. The integrated lacing device may be triggered to cause the arms to suddenly flex together, causing the lance to strike a part of a patient.
    Type: Grant
    Filed: November 14, 1988
    Date of Patent: January 8, 1991
    Assignee: Invictus, Inc.
    Inventor: William J. Schnell
  • Patent number: 4900389
    Abstract: A method of radio frequency sealing attaches a seal member to a cylindrical, hollow, access port of a container. The method uses two sets of spaced apart die elements to generate an axial electric field along a region where the port and seal member overlap. An external peripheral ring is formed about an exterior surface of the port. The method can be used with containers having a sealed periphery as well as those previously filled with a fluid.
    Type: Grant
    Filed: August 9, 1988
    Date of Patent: February 13, 1990
    Assignee: Baxter Travenol Laboratories, Inc.
    Inventors: William J. Schnell, John M. Munsch, Robert W. Flagler, Eugene Fabisiewicz, Pierre Soubrier
  • Patent number: 4821996
    Abstract: A multi-position rotary valve system is useable with a disposable fluid transfer set for carrying out a sequence of steps to implement a drain and fill procedure in connection with peritoneal dialysis. A method of carrying out peritoneal dialysis includes utilizing a rotary, multi-position, valve system in conjunction with a fluid flow transfer set having a plurality of flexible fluid flow conduits. The valve system provides for systematically opening and closing the respective fluid flow conduits in a predetermined sequence for the purpose of carrying out a drain and fill procedure of the type associated with peritoneal dialysis.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: April 18, 1989
    Assignee: Baxter Travenol Laboratories, Inc.
    Inventors: Marc Bellotti, William J. Schnell, John F. Love, Randy K. Murphey, Larry C. Taylor, Franco Peluso
  • Patent number: 4816221
    Abstract: A method of forming a unitary, sterile fluid dispensing assembly includes forming a fluid-filled container with a vinyl disposing port and forming a fluid transfer set with a vinyl spike connector. The spike connector is inserted into the vinyl disposing port thereby placing the set in fluid flow communication with the fluid in the container. The assembly is sterilized in an autoclave. The heat of sterilization melds at least a surface portion of the vinyl spike connector and softens an interior adjacent surface portion of the port on the container. After sterilization, the transfer set is permanently bonded to the container. The presence of the fluid in the transfer set during sterilization prevents fusing and closing of the lumens of the set due to the heat of sterilization.
    Type: Grant
    Filed: December 8, 1986
    Date of Patent: March 28, 1989
    Assignee: Baxter Travenol Laboratories, Inc.
    Inventors: Roger W. Harvey, William J. Schnell
  • Patent number: 4794926
    Abstract: Described is a lancet cartridge for drawing blood samples from the finger of a patient which includes a first housing for receiving a lancet disk having a plurality of radially extending lancets, each lancet having a tooth projecting from the end thereof, and a second housing engageable with the first housing, the housings being rotatable with respect to each other, the one housing includes a ramp for receiving the end of the lancets whereby the lancet is elevated when the cartridge housing is rotated. A platform is positioned in one of the housings to receive the lancet as it is elevated by the ramp to thereby place the lancet in a cocked position. The second housing member includes at least one opening through which the end of the lancets can project to pierce the patient's finger. A trigger is positioned to be activated when a finger is placed in the opening to release the cocked lancet from the platform and pierce the patient's finger.
    Type: Grant
    Filed: November 24, 1986
    Date of Patent: January 3, 1989
    Assignee: Invictus, Inc.
    Inventors: John M. Munsch, Mark D. Ruby, William J. Schnell, Jimmy L. Miller