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: 6685680
    Abstract: A cannula and method for providing an external connection with an implanted artificial port for communicating with a body lumen of a patient. The artificial port has an entrance conduit with an inwardly tapering section. The tapered cannula is sized and proportioned to substantially match and seal with the inwardly tapering section of the entrance conduit. Thus the cannula can form a readily removable seal with the inwardly tapering section. A typical angle of taper is one to three degrees.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: February 3, 2004
    Assignee: DSU Medical Corporation
    Inventors: David S. Utterberg, William J. Schnell
  • Patent number: 6616635
    Abstract: A medical needle protector sheath comprises a tubular body for surrounding and shielding a needle, with the sheath defining an anchor member integrally attached to the front of the body for manual holding, plus a closure cap for the front end which is integrally attached to the body. Also, a manually removable wing member may be carried about the hub of the needle. A tunnel member typically of the inverted U cross section provides longitudinal securance to the needle and hub while penetrating the skin of the patient while at the same time permitting axial rotation of the needle.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: September 9, 2003
    Assignee: DSU Medical Corp.
    Inventors: David Bell, William J. Schnell, David S. Utterberg
  • Publication number: 20030138348
    Abstract: A tubular set portion for circulating blood between a patient and an extracorporeal blood treatment device. The set portion comprises: an arterial tube for conveying blood from a patient toward the blood treatment device; a venous tube for conveying blood from the blood treatment device back towards the patient; and a pair of spaced, transverse tubes that each connect between the arterial tube and the venous tube, each of the tubes being capable of clamp sealing. The arterial and venous tubes are clamp sealable between the spaced, transverse tubes. Flow reversal on the patient's side of this device is possible by appropriate clamping of two opposed tube sections of the rectangular array which may be formed by the joined tube sections, while flow remains unchanged on the side of the tubular set portion that is connected to the extracorporeal blood treatment device.
    Type: Application
    Filed: January 18, 2002
    Publication date: July 24, 2003
    Inventors: David Bell, William J. Schnell, David S. Utterberg
  • Patent number: 6596234
    Abstract: A tubular set is provided for the extracorporeal treatment of blood, for example hemodialysis. The set has 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: July 28, 2000
    Date of Patent: July 22, 2003
    Assignee: DSU Medical Corp.
    Inventors: William J. Schnell, David S. Utterberg, Ting Ting Yu
  • Patent number: 6517522
    Abstract: A medical needle protector sheath comprises a tubular body for surrounding and shielding a needle with the sheath defining an anchor member integrally attached to the front of the body for manual holding, plus a closure cap for the front end which is integrally attached to the body. Also, a manually removable wing member may be carried about the hub of the needle. A tunnel member typically of the inverted U-cross section provides longitudinal securance to the needle and hub while penetrating the skin of the patient while at the same time permitting axial rotation of the needle.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: February 11, 2003
    Assignee: DSU Medical Corporation
    Inventors: David Bell, William J. Schnell, David S. Utterberg
  • Patent number: 6517508
    Abstract: A combined arterial and venous blood tubing set is provided for transport of blood between a patient and a blood processing unit. The set comprises an arterial set component comprising arterial tubing having an arterial patient connector at one end and an arterial unit connector at the other. A venous set component has venous tubing with a venous patient connector at one end and a venous unit connector at the other end. The arterial and venous patient connectors, and the arterial and venous unit connectors, are respectively, substantially, and releasably directly connected to each other. As a result of this, the arterial, and venous set components cooperate to form a loop. Other features of improved sets are also disclosed.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: February 11, 2003
    Assignee: DSU Medical Corporation
    Inventors: David S. Utterberg, William J. Schnell, Keith Andrews
  • Patent number: 6514225
    Abstract: Pressure is sensed in blood flow tubing by placing an aqueous, preferably isotonic, substantially cell-free solution into branch connection tubing that connects in branching relation with the blood flow tubing at one end. The branch connection tubing also connects in use with a pressure transducer unit at its other end. An air volume is maintained, occupying a portion of the branch connection tubing which is adjacent to the other end. One flows positively or negatively pressurized blood through the blood flow tubing, with the result that the pressure of the blood is communicated through the aqueous solution and the air volume in the branch connection tubing to the pressure transducer unit, with the blood being spaced from the air volume. Preferably, substantially all of the branch connection tubing containing the aqueous solution and air volume has an inner diameter of substantially no more than 5 mm.
    Type: Grant
    Filed: July 25, 2000
    Date of Patent: February 4, 2003
    Assignee: DSU Medical Corporation
    Inventors: David S. Utterberg, William J. Schnell
  • Publication number: 20020161322
    Abstract: A combined arterial and venous blood tubing set is provided for transport of blood between a patient and a blood processing unit. The set comprises an arterial set component comprising arterial tubing having an arterial patient connector at one end and an arterial unit connector at the other. A venous set component has venous tubing with a venous patient connector at one end and a venous unit connector at the other end. The arterial and venous patient connectors, and the arterial and venous unit connectors, are respectively, substantially, and releasably directly connected to each other. As a result of this, the arterial, and venous set components cooperate to form a loop. Other features of improved sets are also disclosed.
    Type: Application
    Filed: June 21, 2002
    Publication date: October 31, 2002
    Inventors: David S. Utterberg, William J. Schnell, Keith Andrews
  • Publication number: 20020072718
    Abstract: A tubular medical set as main blood flow tubing, a connected, flexible branch tube, a flow restriction device to suppress pressure pulses. The device is positioned to control flow through the branch tube. The flow restriction device permits substantially free, unhindered flow from the branch tube to the main blood flow tubing, while significantly restricting, but not completely blocking, flow from the main blood flow tubing to the branch tube.
    Type: Application
    Filed: February 13, 2002
    Publication date: June 13, 2002
    Inventors: James M. Brugger, David S. Utterberg, William J. Schnell, G. Keith Andrews
  • Patent number: 6383158
    Abstract: Pressure is sensed in blood flow tubing by placing an aqueous, preferably isotonic, substantially cell-free solution into branch connection tubing that connects in branching relation with the blood flow tubing at one end. The branch connection tubing also connects in use with a pressure transducer unit at its other end. An air volume is maintained, occupying a portion of the branch connection tubing which is adjacent to the other end. One flows positively or negatively pressurized blood through the blood flow tubing, with the result that the pressure of the blood is communicated through the aqueous solution and the air volume in the branch connection tubing to the pressure transducer unit, with the blood being spaced from the air volume. Preferably, substantially all of the branch connection tubing containing the aqueous solution and air volume has an inner diameter of substantially no more than 5 mm.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: May 7, 2002
    Assignee: DSU Medical Corporation
    Inventors: David S. Utterberg, William J. Schnell
  • Publication number: 20020032416
    Abstract: A cannula and method for providing an external connection with an implanted artificial port for communicating with a body lumen of a patient. The artificial port has an entrance conduit with an inwardly tapering section. The tapered cannula is sized and proportioned to substantially match and seal with the inwardly tapering section of the entrance conduit. Thus the cannula can form a readily removable seal with the inwardly tapering section. A typical angle of taper is one to three degrees.
    Type: Application
    Filed: July 16, 2001
    Publication date: March 14, 2002
    Inventors: David S. Utterberg, William J. Schnell
  • Patent number: 6346084
    Abstract: Access pressure for the vascular system is measured through a first tube, which is connected to the vascular system of a patient. The method comprises the following steps: connecting one end of pressure tubing to an outer end of the first tube with a member blocking the flow of blood through at least part of the pressure tubing, while permitting the passage of air therethrough, to attenuate pressure pulses through the tubing. One connects the other end of the tubing to a pressure gauge. Thus, pressure sensed from the vascular system is read by the gauge. Preferably, the internal volume of the pressure tubing is less than the internal volume of the first tube. Thus, pressurized blood entering the first tube as the pressure is read does not advance completely through the first tube.
    Type: Grant
    Filed: January 10, 2000
    Date of Patent: February 12, 2002
    Assignee: DSU Medical Corporation
    Inventors: William J. Schnell, Gary Leeman, David S. Utterberg
  • Publication number: 20020007137
    Abstract: Pressure is sensed in blood flow tubing by placing an aqueous, preferably isotonic, substantially cell-free solution into branch connection tubing (branch tube) that connects in branching relation with the blood flow tubing at one end. The branch connection tubing may also connect in use with a pressure transducer unit at its other end, or pressure may be mechanically indicated. An air volume is maintained, occupying a portion of the branch connection tubing which is adjacent to the other end. One flows positively or negatively pressurized blood through the blood flow tubing, with the result that the pressure of the blood is communicated through the aqueous solution and the air volume in the branch connection tubing to the pressure transducer unit, with the blood being spaced from the air volume. Preferably, substantially all of the branch connection tubing containing the aqueous solution and air volume has an inner diameter of substantially no more than 5 mm.
    Type: Application
    Filed: September 21, 2001
    Publication date: January 17, 2002
    Inventors: David S. Utterberg, William J. Schnell
  • Patent number: 6319465
    Abstract: A tubular set is provided for use with extracorporeal treatment of blood. The set comprises: a flow reversing valve having a patient arterial line and a patient venous line each separately connected to one side of the valve. A unit arterial line and a unit venous line are each separately connected to the other side of the valve. The patient arterial line connects with the unit arterial line in a first position of a valve, and the patient venous line connects with the unit venous line in the same first valve position. The patient arterial line connects with the patient venous line in a second position of a valve, while the patient venous line connects with the unit arterial line in the same second valve position. The flow reversing valve is movable between the first and second positions by relative rotation of part of the valve and adjacent portions of the respective lines.
    Type: Grant
    Filed: June 3, 1999
    Date of Patent: November 20, 2001
    Assignee: DSU Medical Corporation
    Inventors: William J. Schnell, David S. Utterberg, Ting Ting Yu
  • Publication number: 20010031222
    Abstract: A tubular set is provided for use with extracorporeal treatment of blood. The set comprises: a flow reversing valve having a patient arterial line and a patient venous line each separately connected to one side of the valve. A unit arterial line and a unit venous line are each separately connected to the other side of the valve. The patient arterial line connects with the unit arterial line in a first position of a valve, and the patient venous line connects with the unit venous line in the same first valve position. The patient arterial line connects with the patient venous line in a second position of a valve, while the patient venous line connects with the unit arterial line in the same second valve position. The flow reversing valve is movable between the first and second positions by relative rotation of part of the valve and adjacent portions of the respective lines.
    Type: Application
    Filed: May 9, 2001
    Publication date: October 18, 2001
    Inventors: William J. Schnell, David S. Utterberg, Ting Ting Yu
  • Publication number: 20010016714
    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 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: Application
    Filed: February 23, 2001
    Publication date: August 23, 2001
    Inventors: David Bell, William J. Schnell
  • Publication number: 20010003149
    Abstract: A cannula for providing an external connection with an implanted artificial port for communicating with the body lumen of a patient. The artificial port has an entrance conduit with an inwardly tapering section. The tapered cannula is sized and proportioned to substantially match and seal with the inwardly tapering section of the entrance conduit. Thus the cannula can form a readily removable seal with the inwardly tapering section. A typical angle of taper is one to two degrees.
    Type: Application
    Filed: January 30, 2001
    Publication date: June 7, 2001
    Inventors: David S. Utterberg, William J. Schnell
  • Patent number: 6206954
    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: December 22, 1999
    Date of Patent: March 27, 2001
    Assignee: DSU Medical Corporation
    Inventors: William J. Schnell, David S. Utterberg
  • Patent number: 6193694
    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 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 9, 2000
    Date of Patent: February 27, 2001
    Assignee: DSU Medical Corporation
    Inventors: David Bell, William J. Schnell
  • 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