Patents by Inventor Blair D. Walker

Blair D. Walker 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).

  • Publication number: 20080177230
    Abstract: A kit of parts comprises a system and instructions for use for controlling patient temperature which uses a central venous line catheter having a heat exchange element. The central venous line catheter is provided with one or more lumens for providing access to the central blood supply of the patient and with additional lumens for communicating heat exchange fluid to the heat exchange element. Heat exchange fluid temperature is controlled through a feed back loop iii which patient temperature is sensed and used to control a temperature control unit comprising a heating device and/or a cooling device in heat exchange relationship with the heat exchange fluid. A tubing set transports the heat exchange fluid between the central venous line and the temperature control unit, with a pump serving to circulate the fluid in a closed fluid circuit in the system.
    Type: Application
    Filed: January 16, 2008
    Publication date: July 24, 2008
    Inventors: Blair D. Walker, Scott M. Evans, David P. Baiding, Peter Barker
  • Patent number: 7255709
    Abstract: An indwelling heat exchange catheter with integrated temperature sensor includes a catheter tube. A closed loop heat exchanger extends from the catheter tube. A temperature sensor can be integrally formed with the catheter tube such that it is insulated from the closed loop heat exchanger. The indwelling heat exchange catheter can further include a guide-wire tube that extends from the catheter tube and in such a case, the temperature sensor can be affixed to the guide-wire tube. Alternatively, a wire can extend through the catheter tube and the temperature sensor can be affixed to the wire.
    Type: Grant
    Filed: August 6, 2004
    Date of Patent: August 14, 2007
    Assignee: Alsius Corporation
    Inventors: Blair D. Walker, Peter Barker, Hortensia Pompa, Xochitl Huezo, Lynn Miyeko Shimada
  • Patent number: 6893419
    Abstract: A catheter is adapted to exchange heat with a body fluid, such as blood, flowing in a body conduit, such as a blood vessel. The catheter includes a shaft with a heat exchange region disposed at its distal end. This region may include hollow fibers which are adapted to receive a remotely cooled heat exchange fluid preferably flowing in a direction counter to that of the body fluid. The hollow fibers enhance the surface area of contact, as well as the mixing of both the heat exchange fluid and the body fluid. The catheter can be positioned to produce hypothermia in a selective area of the body or alternatively positioned to systemically cool the entire body system.
    Type: Grant
    Filed: September 4, 2001
    Date of Patent: May 17, 2005
    Assignee: Alsius Corp.
    Inventors: Wayne A. Noda, Mike L. Jones, Scott M. Evans, Blair D. Walker, William J. Worthen, Yves Pierre Gobin
  • Publication number: 20040215163
    Abstract: Plural coolant inlet holes are provided into a balloon of a closed loop intravascular cooling catheter to increase the effective surface area of the balloon available for heat exchange. The coolant may be a mixture of water and ethanol.
    Type: Application
    Filed: April 28, 2003
    Publication date: October 28, 2004
    Inventors: Blair D. Walker, Wayne Arthur Noda
  • Patent number: 6726653
    Abstract: A catheter is adapted to exchange heat with a body fluid, such as blood, flowing in a body conduit, such as a blood vessel. The catheter includes a shaft with a heat exchange region disposed at its distal end. This region may include hollow fibers which are adapted to receive a remotely cooled heat exchange fluid preferably flowing in a direction counter to that of the body fluid. The hollow fibers enhance the surface area of contact, as well as the mixing of both the heat exchange fluid and the body fluid. The catheter can be positioned to produce hypothermia in a selective area of the body or alternatively positioned to systemically cool the entire body system.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: April 27, 2004
    Assignee: Alsius Corp.
    Inventors: Wayne A. Noda, Mike L. Jones, Scott M. Evans, Blair D. Walker, William J. Worthen, Yves Pierre Gobin
  • Patent number: 6719724
    Abstract: An intravenous catheter system (apparatus and method) for controlling patient temperature includes a generally tubular elongated body having lumens for circulating a heat exchange fluid in a plurality of heat exchange elements provided at spaced intervals along the length of the elongated body. The heat exchange elements preferably comprise inflatable balloons. Heat exchange occurs between the fluid in the balloons and blood in the blood vessel. Each balloon preferably is sized such that, when inflated, each balloon blocks no more than approximately 30% to 75% of the blood vessel in which it is intubated. The catheter preferably has two to four balloons, each of which may have a different shape. The catheter also preferably has three to five infusion lumens for providing access to the patient's blood at different locations in the patient's bloodstream.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: April 13, 2004
    Assignee: Alsius Corporation
    Inventors: Blair D. Walker, Scott M. Evans, Wayne A. Noda
  • Patent number: 6716188
    Abstract: A catheter is adapted to exchange heat with a body fluid, such as blood, flowing in a body conduit, such as a blood vessel. The catheter includes a shaft with a heat exchange region disposed at its distal end. This region may include hollow fibers which are adapted to receive a remotely cooled heat exchange fluid preferably flowing in a direction counter to that of the body fluid. The hollow fibers enhance the surface area of contact, as well as the mixing of both the heat exchange fluid and the body fluid. The catheter can be positioned to produce hypothermia in a selective area of the body or alternatively positioned to systemically cool the entire body system.
    Type: Grant
    Filed: September 4, 2001
    Date of Patent: April 6, 2004
    Assignee: Alsius Corporation
    Inventors: Wayne A. Noda, Mike L. Jones, Scott M. Evans, Blair D. Walker, William J. Worthen, Yves Pierre Gobin
  • Publication number: 20040059243
    Abstract: An intravascular thermography device comprising an elongate catheter having a distal guidewire port, a proximal guidewire port at a location closer to the distal end of the catheter than the proximal end, and a guidewire lumen. An expansion frame is attached to the catheter. The expansion frame is operable to expand, and has at least one temperature sensor. A capture sheath is slideably disposed about the expansion frame and operable from the proximal end of the catheter to release the expansion frame when the capture sheath is removed from the expansion frame. The capture sheath has a passage in a distal region of the capture sheath, the passage being shaped to align with the proximal guidewire port of the catheter. A registry mechanism is provided to maintain circumferential alignment between the proximal guidewire port and the passage in the distal region of the capture sheath. Methods of use are also disclosed.
    Type: Application
    Filed: September 23, 2002
    Publication date: March 25, 2004
    Applicant: VOLCANO THERAPEUTICS, INC.
    Inventors: Jesus Flores, Tracy D. Maahs, Blair D. Walker
  • Publication number: 20040059244
    Abstract: An intravascular thermography device comprising an elongate catheter having a proximal end, a distal end, a distal guidewire port in a distal region of the catheter, a proximal guidewire port at a location closer to the distal end of the catheter than the proximal end, and a lumen is described. The lumen extends between the proximal guidewire port and the distal guidewire port and is adapted to receive a guidewire. An expansion frame is attached to the catheter at a location distal to the proximal guidewire port. The expansion frame is operable between a contracted condition and an expanded condition, and has at least one temperature sensor. Methods of use are also described.
    Type: Application
    Filed: January 14, 2003
    Publication date: March 25, 2004
    Applicant: Volcano Therapeutics, Inc.
    Inventors: Jesus Flores, Tracy D. Maahs, Blair D. Walker
  • Patent number: 6709448
    Abstract: A heat exchange catheter having an open core includes a catheter body for use in the central vasculature of a patient. The catheter body having a balloon with at least one heat exchange lumen for exchanging heat with flowing blood. The balloon inflates from a collapsed configuration to an inflated configuration. In the inflated configuration the balloon facilitates the flow of heat exchange fluid through the heat exchange lumen, which wraps in a helical pattern to define the open core and to enable blood to flow through the open core during use of the catheter. The open core defines an inside and an outside, the heat exchange lumen has non-contiguous helical winds to allow flowing blood to mix between the inside of the open core and the outside of the open core.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: March 23, 2004
    Assignee: Alsius Corporation
    Inventors: Blair D. Walker, Wayne A. Noda
  • Patent number: 6652565
    Abstract: An introducer sheath for a central venous catheter includes a sheath body and a temperature sensor mounted distally on the body. Either the catheter or sheath has a heat exchange region through which coolant is circulated to effect heat exchange with the body, with the coolant temperature being controlled in response to signals from the temperature sensor. Arterial dialysis heat exchange catheters and jugular bulb heat exchange catheters are also disclosed.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: November 25, 2003
    Assignee: Alsius Corporation
    Inventors: Lynn M. Shimada, William J. Worthen, Scott M. Evans, Xia Luo, Robert Pecor, Blair D. Walker
  • Patent number: 6645234
    Abstract: An intravenous cardiovascular guiding catheter system (apparatus and method) for controlling patient temperature includes a generally tubular elongate body having a guide lumen with a guide duct disposed at the distal tip of the catheter for providing a pathway through which medical apparatus may be advanced in the patient's circulatory system. The catheter also comprises one or more lumens for conveying a heat exchange fluid to one or more heat exchange elements that exchange heat with the patient's blood to control the patient's temperature. The catheter may have an internal heating element that heats or cools the heat exchange fluid. The catheter also preferably has one or more infusion lumens for providing access to the patient's central blood supply. The catheter may be used to treat myocardial infarction.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: November 11, 2003
    Assignee: Alsius Corporation
    Inventors: Scott M. Evans, Blair D. Walker
  • Publication number: 20030208156
    Abstract: A system for controlling patient temperature uses a central venous line catheter having axially spaced distal and proximal heat exchange balloons. The central venous line catheter is provided with one or more lumens for providing access to the central blood supply of the patient, and with additional lumens for communicating heat exchange fluid to the balloons. Heat exchange fluid temperature is controlled through a feed back loop in which patient temperature is sensed and used to control a temperature control unit comprising a heating device and/or a cooling device in heat exchange relationship with the heat exchange fluid. A tubing set transports the heat exchange fluid between the central venous line and the temperature control unit, with a pump serving to circulate the fluid in a closed fluid circuit in the system.
    Type: Application
    Filed: August 13, 2001
    Publication date: November 6, 2003
    Inventors: Nora Tran Pham, Lynn M. Shimada, Scott M. Evans, Blair D. Walker
  • Patent number: 6641603
    Abstract: A intravascular heat exchange catheter includes a catheter body having a proximal end connectable with a heat exchange fluid source and a distal end insertable into the vasculature of a patient to facilitate heat transfer with flowing blood. The core has at least one heat exchange fluid lumen for circulating heat exchange fluid within the catheter body. A heat exchanger, e.g. a balloon surrounds a portion of the proximal end of the catheter. The heat exchanger is in fluid communication with the heat exchange fluid lumen for enabling heat exchange fluid from the heat exchange fluid source to circulate through the core and the balloon. A wire, or similar retainer, wraps around the balloon to seal the balloon against the core, forming at least two heat exchange lumens between the balloon and the core.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: November 4, 2003
    Assignee: Alsius Corporation
    Inventors: Blair D. Walker, Nora T. Pham
  • Publication number: 20030195466
    Abstract: A system for controlling patient temperature uses a central venous line catheter having axially spaced distal and proximal heat exchange balloons. The central venous line catheter is provided with one or more lumens for providing access to the central blood supply of the patient, and with additional lumens for communicating heat exchange fluid to the balloons. Heat exchange fluid temperature is controlled through a feed back loop in which patient temperature is sensed and used to control a temperature control unit comprising a heating device and/or a cooling device in heat exchange relationship with the heat exchange fluid. A tubing set transports the heat exchange fluid between the central venous line and the temperature control unit, with a pump serving to circulate the fluid in a closed fluid circuit in the system.
    Type: Application
    Filed: May 8, 2003
    Publication date: October 16, 2003
    Applicant: Alsius Corporation
    Inventors: Nora Tran Pham, Lynn M. Shimada, Scott M. Evans, Blair D. Walker
  • Patent number: 6620131
    Abstract: A system for controlling patient temperature uses a central venous line catheter having axially spaced distal and proximal heat exchange balloons. The central venous line catheter is provided with one or more lumens for providing access to the central blood supply of the patient, and with additional lumens for communicating heat exchange fluid to the balloons. Heat exchange fluid temperature is controlled through a feed back loop in which patient temperature is sensed and used to control a temperature control unit comprising a heating device and/or a cooling device in heat exchange relationship with the heat exchange fluid. A tubing set transports the heat exchange fluid between the central venous line and the temperature control unit, with a pump serving to circulate the fluid in a closed fluid circuit in the system.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: September 16, 2003
    Assignee: Alsius Corporation
    Inventors: Nora Tran Pham, Lynn M. Shimada, Scott M. Evans, Blair D. Walker
  • Patent number: 6529775
    Abstract: An indwelling RF catheter achieves warming of patients by dielectric heating of blood or other bodily fluids. In one example, the catheter is deployed in a suitable blood vessel, such as the inferior vena cava. The catheter design includes an emitter structure electrically coupled to an RF generator, which provides a source of RF power. The emitter structure, distally located upon the catheter, administers electromagnetic radiation to the blood within the patient, thereby creating heat due to the dielectric qualities of blood. As blood heated by the indwelling RF catheter courses through the patient's body, the patient's body is systemically warmed, raising the body core temperature.
    Type: Grant
    Filed: January 16, 2001
    Date of Patent: March 4, 2003
    Assignee: Alsius Corporation
    Inventors: Mark Evan Whitebook, Blair D. Walker, Scott M. Evans, Lynn M. Shimada
  • Publication number: 20030040782
    Abstract: A heat exchange catheter has a catheter body with an inflow lumen, an outflow lumen, and an infusion lumen. A first heat exchange balloon helically wraps around at least a portion of the catheter body in fluid communication with the inflow lumen. A second heat exchange balloon helically wraps around at least a portion of the catheter body in fluid communication with the outflow lumen. The first and second balloons form a gap there between to facilitate infusion of fluid into the blood stream of the patient via an infusion port formed within the gap.
    Type: Application
    Filed: July 25, 2002
    Publication date: February 27, 2003
    Inventors: Blair D. Walker, Nora Tran Pham, Xochitl Huezo
  • Publication number: 20030040733
    Abstract: A liquid embolic delivery system is provided for trapping an injected liquid embolic composition to prevent the liquid embolic from solidifying or otherwise passing outside of an embolization area. The delivery system includes a catheter for delivery of a liquid embolic composition and a containment member positioned at a distal end of the catheter which is shaped to trap the liquid embolic composition delivered through the lumen of the catheter. The containment member is formed as a brush, nest, sponge, swab, flexible sack, or other shape into and around which the liquid embolic composition is injected. The liquid embolic composition is trapped or meshes with the containment member during solidification containing the liquid embolic and preventing the embolic composition from passing into the blood stream.
    Type: Application
    Filed: September 13, 2002
    Publication date: February 27, 2003
    Inventors: Andrew H. Cragg, Blair D. Walker, John Perl, Michael Jones, George Robert Greene, George Wallace, Richard J. Greff
  • Patent number: 6511468
    Abstract: A liquid embolic delivery system is provided for trapping an injected liquid embolic composition to prevent the liquid embolic from solidifying or otherwise passing outside of an embolization area. The delivery system includes a catheter for delivery of a liquid embolic composition and a containment member positioned at a distal end of the catheter which is shaped to trap the liquid embolic composition delivered through the lumen of the catheter. The containment member is formed as a brush, nest, sponge, swab, flexible sack, or other shape into and around which the liquid embolic composition is injected. The liquid embolic composition is trapped or meshes with the containment member during solidification containing the liquid embolic and preventing the embolic composition from passing into the blood stream.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: January 28, 2003
    Assignee: Micro Therapeutics, Inc.
    Inventors: Andrew H. Cragg, Blair D. Walker, John Perl, II, Michael Jones, George Robert Greene, George Wallace, Richard J. Greff