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: 20020161331
    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: Application
    Filed: October 19, 2001
    Publication date: October 31, 2002
    Inventors: Wayne A. Noda, Mike L. Jones, Scott M. Evans, Blair D. Walker, William J. Worthen, Yves Pierre Gobin
  • Publication number: 20020156421
    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: Application
    Filed: October 19, 2001
    Publication date: October 24, 2002
    Applicant: Alsius Corporation
    Inventors: Wayne A. Noda, Mike L. Jones, Scott M. Evans, Blair D. Walker, William J. Worthen, Yves Pierre Gobin
  • Publication number: 20020151944
    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: Application
    Filed: April 11, 2002
    Publication date: October 17, 2002
    Applicant: Alsius
    Inventors: Blair D. Walker, Nora T. Pham
  • Publication number: 20020151942
    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: Application
    Filed: April 11, 2002
    Publication date: October 17, 2002
    Applicant: Alsius
    Inventors: Blair D. Walker, Wayne A. Noda
  • Patent number: 6450990
    Abstract: A catheter using multiple hollow fibers to carry a heating/cooling fluid employs fiber spreading features to improve heat transfer and help prevent clotting of body fluids within which the catheter is immersed. The catheter includes a length of outer tube surrounding an inner tube. The inner tube conveys fluids in one direction, and the passageway between inner and outer tubes conveys fluids in the opposite direction. The inner and outer tubes have proximal distal ends. The distal end is closed, but the proximal end is open to permit introduction of a heating or cooling fluid into the inner tube, and withdrawal of the fluid from the passageway between the inner and outer tubes. At the tubes' distal end resides a proximal fluid transfer housing coupled to multiple hollow heat exchange fibers. The distal ends of these fibers may be commonly connected to a distal fluid transfer housing and optional reservoir, which cooperatively return fluid to the passageway between inner and outer tubes.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: September 17, 2002
    Assignee: Alsius Corporation
    Inventors: Blair D. Walker, Scott M. Evans, David P. Balding, Gregg Hallam, Lynn M. Shimada
  • Publication number: 20020120314
    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: Application
    Filed: February 1, 2002
    Publication date: August 29, 2002
    Inventors: Scott M. Evans, Blair D. Walker
  • Publication number: 20020111584
    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 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 24, 2001
    Publication date: August 15, 2002
    Inventors: Blair D. Walker, Scott M. Evans, David P. Balding, Peter Barker
  • Publication number: 20020095198
    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: Application
    Filed: January 16, 2001
    Publication date: July 18, 2002
    Inventors: Mark Evan Whitebook, Blair D. Walker, Scott M. Evans, Lynn M. Shimada
  • Patent number: 6419643
    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 18, 1999
    Date of Patent: July 16, 2002
    Assignee: Alsius Corporation
    Inventors: Lynn M. Shimada, William J. Worthen, Scott M. Evans, Xia Luo, Robert Pecor, Blair D. Walker
  • Publication number: 20020049410
    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: Application
    Filed: September 4, 2001
    Publication date: April 25, 2002
    Inventors: Wayne A. Noda, Mike L. Jones, Scott M. Evans, Blair D. Walker, William J. Worthen, Yves Pierre Gobin
  • Publication number: 20020049409
    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: Application
    Filed: September 4, 2001
    Publication date: April 25, 2002
    Inventors: Wayne A. Noda, Mike L. Jones, Scott M. Evans, Blair D. Walker, William J. Worthen, Yves Pierre Gobin
  • Publication number: 20020029016
    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 10, 2001
    Publication date: March 7, 2002
    Applicant: Entire Interest
    Inventors: Nora Tran Pham, Lynn M. Shimada, Scott M. Evans, Blair D. Walker
  • Patent number: 6338727
    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: August 13, 1998
    Date of Patent: January 15, 2002
    Assignee: Alsius Corporation
    Inventors: Wayne A. Noda, Mike L. Jones, Scott M. Evans, Blair D. Walker, William J. Worthen, Yves Pierre Gobin
  • Publication number: 20010031946
    Abstract: A catheter using multiple hollow fibers to carry a heating/cooling fluid employs fiber spreading features to improve heat transfer and help prevent clotting of body fluids within which the catheter is immersed. The catheter includes a length of outer tube surrounding an inner tube. The inner tube conveys fluids in one direction, and the passageway between inner and outer tubes conveys fluids in the opposite direction. The inner and outer tubes have proximal distal ends. The distal end is closed, but the proximal end is open to permit introduction of a heating or cooling fluid into the inner tube, and withdrawal of the fluid from the passageway between the inner and outer tubes. At the tubes' distal end resides a proximal fluid transfer housing coupled to multiple hollow heat exchange fibers. The distal ends of these fibers may be commonly connected to a distal fluid transfer housing and optional reservoir, which cooperatively return fluid to the passageway between inner and outer tubes.
    Type: Application
    Filed: June 11, 2001
    Publication date: October 18, 2001
    Inventors: Blair D. Walker, Scott M. Evans, David P. Balding, Gregg Hallam, Lynn M. Shimada
  • Patent number: 6299599
    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: October 27, 1999
    Date of Patent: October 9, 2001
    Assignee: Alsius Corporation
    Inventors: Nora Tran Pham, Lynn M. Shimada, Scott M. Evans, Blair D. Walker
  • Patent number: 6027461
    Abstract: An infusion guidewire that can be used either as a guidewire or an infusion catheter having an integral, tapered core wire within an infusion lumen formed of the aligned lumens of the conduit of a proximal connector housing, a proximal inner sheath in a proximal guidewire portion and a distal coil wire in a distal guidewire portion. The core wire proximal end is attached to the connector housing, and the core wire distal end is connected to the distal end of the distal wire coil. An outer sheath is attached to the connector housing and formed over the proximal inner sheath and the distal wire coil. A plurality of infusion side holes are formed in a distal infusion segment of the outer sheath in fluid communication with the infusion lumen.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: February 22, 2000
    Assignee: Micro Therapeutics, Inc.
    Inventors: Blair D. Walker, Scott M. Evans
  • Patent number: 6022363
    Abstract: A miniaturized obstruction treatment device, e.g., a brush, particularly adapted for medical use formed at the distal end of an elongated brush drive shaft having a hollow lumen formed therein for introduction over a guidewire. The brush drive shaft is enclosed in the lumen of an brush delivery catheter, and the brush bristles of the distal brush are adapted to be garaged in a distal end section of the brush delivery catheter lumen. A Y-connector and an brush sub-assembly connector are attached to the proximal end of the brush delivery catheter and form an brush sub-assembly with the brush drive shaft and brush. The Y-connector allows infusion of thrombolytic agents into the brush delivery catheter lumen for emission at the distal end opening thereof adjacent the brush. In use, the brush sub-assembly connector connects the brush sub-assembly with a drive motor unit connector of a drive motor unit. The drive motor unit receives the proximal end of the drive shaft and rotates it to rotate the brush bristles.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: February 8, 2000
    Assignee: Micro Therapeutics, Inc.
    Inventors: Blair D. Walker, Scott L. Pool
  • Patent number: 5997487
    Abstract: An infusion wire that can be used either as a guidewire or an infusion catheter having a tapered core wire within an infusion lumen formed of the aligned lumens of the conduit of a proximal connector housing, an inner sheath in a proximal infusion wire portion and a distal coil wire in a distal infusion wire portion. The inner sheath is formed either of a polyimide tube or a wire reinforced polyimide tube, at least in a proximal section thereof In a fixed core wire embodiment, the core wire proximal end is attached to the connector housing, and the core wire distal end is connected to the distal end of the distal wire coil. An outer sheath is attached to the connector housing and formed over the inner sheath and the distal wire coil. A plurality of infusion side holes are formed in a distal infusion segment of the outer sheath in fluid communication with the infusion lumen.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: December 7, 1999
    Assignee: Micro Therapeutics, Inc.
    Inventors: Donald J. Kolehmainen, Blair D. Walker
  • Patent number: 5800408
    Abstract: An infusion device for use in delivering an infusate from an elongated infusion segment along an elongated section of a body vessel with either a relatively symmetric infusate distribution profile or asymmetric infusate distribution profile that concentrates infusate delivery proximally or distally along the infusion segment. The infusion segment is formed with an infusate distribution manifold for delivering infusate through a plurality of side wall exit ports in the elongated infusion segment having proximal and distal manifold end openings to which infusate is delivered in equal amounts to effect the relatively uniform infusate distribution profile or in relative proportions to effect the asymmetric infusate distribution profile. In differing embodiments, the infusate delivery is either fixed or may be adjusted by a proximal adjustable valve mechanism.
    Type: Grant
    Filed: November 8, 1996
    Date of Patent: September 1, 1998
    Assignee: Micro Therapeutics, Inc.
    Inventors: Jonathan H. Strauss, Blair D. Walker
  • Patent number: 5681335
    Abstract: A miniaturized brush and method of making same having a hollow lumen for introducing an agent for dissolving a soft fibrinous obstruction, such as a recently formed thrombus, within a patient's vascular system. The brush has soft, flexible bristles extending outward from the drive shaft distal section, the bristles being sufficiently resilient and dimensioned for enabling compression and passage of the brush out of and back into the distal end of an introducer lumen and to mix into the fibrin of the soft thrombus, yet not damage the vessel wall. The brush assembly is formed of a proximal section comprising an elongated proximal tube and a distal section comprising a distal tube extension, the proximal and distal sections having an aligned lumen and forming a drive shaft or brush body.
    Type: Grant
    Filed: July 31, 1995
    Date of Patent: October 28, 1997
    Assignee: Micro Therapeutics, Inc.
    Inventors: R. J. Serra, Blair D. Walker, Scott M. Evans