Patents Assigned to Medisystems Technology Corporation
  • 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: 6089527
    Abstract: A molded squeeze clamp for tubing which comprises a strip of plastic having first and second ends, the strip being bent back on itself so that the ends are adjacent to each other in the manner of a Halkey-Roberts clamp. The first strip end defines a first latch, for engagement and releasable locking with the second end, and the second end defines a second latch for locking with the first latch. The first end also defines a first projection extending towards the second end to reduce or eliminate a gap between the first and second ends when the clamp is in its unstressed, as-molded, open configuration. The second end defines a second projection to facilitate manual opening of the clamp, the second projection extending in substantially longitudinal relation to the axis of tubing carried in the squeeze clamp.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: July 18, 2000
    Assignee: Medisystems Technology Corporation
    Inventor: David S. Utterberg
  • 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: 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: 5983947
    Abstract: A medical fluid set comprises tubing sections interconnected with at least one tubing connector component which connects the tubing sections together to form the set. The set further comprises external connectors carried on ends of at least some tubing sections of the set. At least one of the tubing connector components or external connectors carry, as an integral part thereof, a retaining-sealing member for removable, sealing connection with at least one of the external connectors. The retaining-sealing member is free of fluid flow connection with the set flow path. Thus, separate or tethered closure caps for external connectors can be dispensed with.
    Type: Grant
    Filed: March 3, 1997
    Date of Patent: November 16, 1999
    Assignee: Medisystems Technology Corporation
    Inventor: 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: 5951529
    Abstract: A needle protector sheath comprises a body having a top wall, sidewalls and open ends. A slot is formed in each sidewall to slidingly receive a needle wing extending through each of the slots. Typically the slots extend through one end of the protector sheath. The protector sheath also defines an open, bottom aperture extending from end to end of the body, to permit the sheath to be laterally applied to tubing connected to a winged needle and to be advanced to a position where the needle tip is recessed in the sheath and the needle wings extend through the slots. In another embodiment an elongated anchor member may extend forwardly from the body to be manually pressed to retain the protector sheath as the needle is being withdrawn from the skin of a patient. The anchor member may have an outer end portion that bends away from the patient in position of use. Also, a novel sheath design and slot arrangement is disclosed.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: September 14, 1999
    Assignee: Medisystems Technology Corporation
    Inventor: David S. Utterberg
  • Patent number: 5895571
    Abstract: A hemodialysis system includes the following: a dialysate handling unit for providing dialysate to the patient. This unit includes a hemodialysis solution pump and apparatus for monitoring hemodialysis solution safety such as a conductivity tester. Additionally a solution heater and appropriate conventional controls can be provided, as well as a proportioning system, an ultrafiltration measuring unit, and other known apparatus for handling dialysis solution. A blood handling unit is also provided, which includes a membrane dialyzer and holder, a blood pump, blood flow tubing and safety equipment for monitoring blood flow as it is pumped through the arterial/venous blood conduit set tubing from the patient, through the membrane dialyzer, and back to the patient. A first conduit is present for conveying fresh dialysate from the dialysate handling unit to the blood handling unit (or directly to the membrane dialyzer).
    Type: Grant
    Filed: October 1, 1997
    Date of Patent: April 20, 1999
    Assignee: Medisystems Technology Corporation
    Inventor: David S. Utterberg
  • Patent number: 5895368
    Abstract: An extracorporeal blood set may be primed with physiological solution for use in a blood transporting process such as hemodialysis. The set comprises tubing having a patient connector on an end thereof, and a first branch tube in connection with a source of the solution. The branch tube connects with the set between the ends of the set. The branch tube also connects with further branch tubing, having a second connector which is capable of sealing connection with the patient connector. The method comprises the steps of connecting the patient connector and the second connector to form a closed loop of tubing. One then passes the solution from the source in flow through the first branch tube and further branch tubing to fill them and the set tubing with the solution. One then disconnects the patient connector for subsequent connection with the vascular system of a patient.
    Type: Grant
    Filed: September 23, 1996
    Date of Patent: April 20, 1999
    Assignee: Medisystems Technology Corporation
    Inventor: David S. Utterberg
  • Patent number: 5881774
    Abstract: A connector for blood or solution sets (including dialysis solution sets) comprises a tube having an open outer end. The tube carries a side arm which extends radially outwardly from the tube. A cap is connected to the side arm by typically an integral plastic living hinge in a position permitting said cap to pivot between a closed position in which said cap closes the open, outer end, and an open position in which the cap is spaced from the open, outer end. The side arm defines an effectively rigid, fixed configuration to position the hinge and cap at a position permitting a directed path of motion between the open position and the closed position.
    Type: Grant
    Filed: January 15, 1997
    Date of Patent: March 16, 1999
    Assignee: Medisystems Technology Corporation
    Inventor: David S. Utterberg
  • Patent number: 5824213
    Abstract: A hemodialysis system comprises the following: a dialysate handling unit for providing dialysate to the patient. This unit comprises a hemodialysis solution pump and apparatus for monitoring hemodialysis solution safety such as a conductivity tester. Additionally a solution heater and appropriate conventional controls can be provided, as well as a proportioning system, an ultrafiltration measuring unit, and other known apparatus for handling dialysis solution. A blood handling unit is also provided, which comprises a membrane dialyzer and holder, a blood pump, blood flow tubing and safety equipment for monitoring blood flow as it is pumped through the arterial/venous blood conduit set tubing from the patient, through the membrane dialyzer, and back to the patient. A first conduit is present for conveying fresh dialysate from the dialysate handling unit to the blood handling unit (or directly to the membrane dialyzer).
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: October 20, 1998
    Assignee: Medisystems Technology Corporation
    Inventor: David S. Utterberg
  • Patent number: 5817043
    Abstract: A flow-through blood treatment device such as a hemodialyzer comprises a housing, a blood inlet, a blood outlet, and at least one membrane in the housing defining a blood flow path between the blood inlet and outlet on one side of the membrane, plus a second flow path defined on the other side of the membrane. At least one of the blood inlet and outlet is connected to blood flow tubing, which blood flow tubing carries a connector spaced from the housing for access to the vascular system of a patient. The blood flow tubing also defines at least one connection site along its length permitting repeated, temporary connection and subsequent disconnection with branch conduits, for connection with sources of additive solutions or measuring devices. Typically, the blood flow tubing is free of permanently attached, flexible branch tubings.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: October 6, 1998
    Assignee: Medisystems Technology Corporation
    Inventor: 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: 5772624
    Abstract: Blood lines for hemodialysis and other blood handling procedures may be reused by placing connectors intermediately along the length of the blood lines so that the lines can be disconnected to separate out reusable portions thereof. Specifically, the bulk of the blood lines used may comprise branchless lengths of tubing which are easily reusable, and may be cleaned and stored along with a dialyzer or similar device by connection to a conventional reuse machine. Also, the connectors on the blood lines which are reused may have first and second sealing surfaces. The first sealing surfaces are used in the connections made to form the blood line in its normal form for use. Then, during cleaning and sterilization for reuse, the reusable connectors can connect first and second lengths of blood lines together making use of a second sealing surface, in which the first sealing surfaces are exposed to cleaning/storing solution to cause cleaning and antibacterial action on the first sealing surfaces.
    Type: Grant
    Filed: July 20, 1995
    Date of Patent: June 30, 1998
    Assignee: Medisystems Technology Corporation
    Inventors: David S. Utterberg, Neil J. Sheehan
  • Patent number: 5769815
    Abstract: A plastic blood chamber comprises a chamber-defining wall having a first blood inlet port adjacent to the end of the chamber and a blood outlet port adjacent typically the opposed end of the chamber. The inlet port is positioned in separate, lateral relation with the chamber, and has a conduit extending longitudinally of the chamber from the inlet port toward a central chamber portion in such separate, lateral relation to the chamber. The conduit curves into communication with the chamber in a transverse direction at an inlet position in the central chamber portion. A second portion of the chamber which is laterally opposed to the inlet position of the conduit defines a sloping shoulder to turn lateral blood flow from the conduit gently upwardly to define a gentle, circulatory flow of blood in an upper portion of the chamber. The chamber upper portion has a wall that carries projections to create blood flow eddys that slow the upward motion of bubbles present.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: June 23, 1998
    Assignee: Medisystems Technology Corporation
    Inventor: David S. Utterberg
  • 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: 5704917
    Abstract: A hollow guard having a wall for receiving and enclosing a medical needle after use. The guard has an open end to allow a needle to be inserted into the guard. An adhesive member has a section typically permanently attached to the wall, with portions of the adhesive member being spaced from the wall, for temporary attachment to a patient's skin to secure the guard on the patient's skin.
    Type: Grant
    Filed: October 3, 1995
    Date of Patent: January 6, 1998
    Assignee: Medisystems Technology Corporation
    Inventor: David S. Utterberg
  • Patent number: 5643190
    Abstract: A flow-through blood treatment device such as a hemodialyzer comprises a housing, a blood inlet, a blood outlet, and at least one membrane in the housing defining a blood flow path between the blood inlet and outlet on one side of the membrane, plus a second flow path defined on the other side of the membrane. At least one of the blood inlet and outlet is connected to blood flow tubing, which blood flow tubing carries a connector spaced from the housing for access to the vascular system of a patient. The blood flow tubing also defines at least one connection site along its length permitting repeated, temporary connection and subsequent disconnection with branch conduits, for connection with sources of additive solutions or measuring devices. Typically, the blood flow tubing is free of permanently attached, flexible branch tubings.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: July 1, 1997
    Assignee: Medisystems Technology Corporation
    Inventor: David S. Utterberg