Patents by Inventor Craig D. Petersen

Craig D. Petersen 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: 10570904
    Abstract: A pump drive for an extracorporeal blood pumping system including an adjustable drive magnet. The pump drive may be coupled to a blood pump which includes a pump impeller. The pump drive may include a stepper motor for dynamically adjusting the position of the drive magnet. The position of the drive magnet may be varied to vary the distance between the drive magnet and an impeller magnet of the pump impeller. Adjusting the position of the drive magnet may include dynamically adjusting the drive magnet and may include axially moving the drive magnet to thereby vary a magnetic attraction force between the drive magnet and the impeller magnet which may thereby minimize forces acting on one or more bearings of a pump impeller.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: February 25, 2020
    Assignee: Medtronic, Inc.
    Inventors: Roger A. Naidyhorski, Brian J. Steffens, Craig D. Petersen
  • Publication number: 20180231004
    Abstract: A pump drive for an extracorporeal blood pumping system including an adjustable drive magnet. The pump drive may be coupled to a blood pump which includes a pump impeller. The pump drive may include a stepper motor for dynamically adjusting the position of the drive magnet. The position of the drive magnet may be varied to vary the distance between the drive magnet and an impeller magnet of the pump impeller. Adjusting the position of the drive magnet may include dynamically adjusting the drive magnet and may include axially moving the drive magnet to thereby vary a magnetic attraction force between the drive magnet and the impeller magnet which may thereby minimize forces acting on one or more bearings of a pump impeller.
    Type: Application
    Filed: April 12, 2018
    Publication date: August 16, 2018
    Inventors: Roger A. Naidyhorski, Brian J. Steffens, Craig D. Petersen
  • Patent number: 9945382
    Abstract: A pump drive for an extracorporeal blood pumping system including an adjustable drive magnet. The pump drive may be coupled to a blood pump which includes a pump impeller. The pump drive may include a stepper motor for dynamically adjusting the position of the drive magnet. The position of the drive magnet may be varied to vary the distance between the drive magnet and an impeller magnet of the pump impeller. Adjusting the position of the drive magnet may include dynamically adjusting the drive magnet and may include axially moving the drive magnet to thereby vary a magnetic attraction force between the drive magnet and the impeller magnet which may thereby minimize forces acting on one or more bearings of a pump impeller.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: April 17, 2018
    Assignee: Medtronic, Inc.
    Inventors: Roger A. Naidyhorski, Brian J. Steffens, Craig D. Petersen
  • Publication number: 20170045054
    Abstract: A pump drive for an extracorporeal blood pumping system including an adjustable drive magnet. The pump drive may be coupled to a blood pump which includes a pump impeller. The pump drive may include a stepper motor for dynamically adjusting the position of the drive magnet. The position of the drive magnet may be varied to vary the distance between the drive magnet and an impeller magnet of the pump impeller. Adjusting the position of the drive magnet may include dynamically adjusting the drive magnet and may include axially moving the drive magnet to thereby vary a magnetic attraction force between the drive magnet and the impeller magnet which may thereby minimize forces acting on one or more bearings of a pump impeller.
    Type: Application
    Filed: October 28, 2016
    Publication date: February 16, 2017
    Inventors: Roger A. Naidyhorski, Brian J. Steffens, Craig D. Petersen
  • Patent number: 9511178
    Abstract: A pump drive for an extracorporeal blood pumping system including an adjustable drive magnet. The pump drive may be coupled to a blood pump which includes a pump impeller. The pump drive may include a stepper motor for dynamically adjusting the position of the drive magnet. The position of the drive magnet may be varied to vary the distance between the drive magnet and an impeller magnet of the pump impeller. Adjusting the position of the drive magnet may include dynamically adjusting the drive magnet and may include axially moving the drive magnet to thereby vary a magnetic attraction force between the drive magnet and the impeller magnet which may thereby minimize forces acting on one or more bearings of a pump impeller.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: December 6, 2016
    Assignee: Medtronic, Inc.
    Inventors: Roger A. Naidyhorski, Brian J. Steffens, Craig D. Petersen
  • Publication number: 20140273249
    Abstract: High range activated clotting time (HR-ACT) tests detect blood clotting time in blood samples which have high levels of heparin. Reagents such as calcium chloride and kaolin within the test apparatus trigger clotting. The cartridge is treated with a strong surface treatment process, such as an atmospheric plasma treatment, to increase the hydrophilic property of the test chamber, there may be a significant reduction in the kaolin concentration required to activate the blood sample and initiate the coagulation process. The kaolin concentration may be further reduced if the buffer component used in the buffer saline contains phosphate. The reduction of the kaolin concentration allows more calcium to be released from the kaolin to participate in the clotting process. The combined effect of adding a surface treatment to the cartridge to increase the hydrophilic property of reaction chamber and adding phosphate into buffered saline allows for clot detection of blood samples containing 5˜6 U/mL heparin.
    Type: Application
    Filed: March 12, 2013
    Publication date: September 18, 2014
    Applicant: MEDTRONIC, INC.
    Inventors: Charlene Yuan, Trevor C. Huang, Tessy Kanayinkal, Mary Jo Passenheim, Craig D. Petersen, Ivan Akunovich
  • Publication number: 20140010672
    Abstract: A pump drive for an extracorporeal blood pumping system including an adjustable drive magnet. The pump drive may be coupled to a blood pump which includes a pump impeller. The pump drive may include a stepper motor for dynamically adjusting the position of the drive magnet. The position of the drive magnet may be varied to vary the distance between the drive magnet and an impeller magnet of the pump impeller. Adjusting the position of the drive magnet may include dynamically adjusting the drive magnet and may include axially moving the drive magnet to thereby vary a magnetic attraction force between the drive magnet and the impeller magnet which may thereby minimize forces acting on one or more bearings of a pump impeller.
    Type: Application
    Filed: July 9, 2012
    Publication date: January 9, 2014
    Inventors: Roger A. Naidyhorski, Brian J. Steffens, Craig D. Petersen