Catheter navigation within an MR imaging device
First Claim
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1. A method of navigating a medical device having a variable magnetic moment within an operating region within a patient, using an MR imaging device, the method comprising:
- applying a static magnetic field to the operating region with an external magnet of an MR imaging device;
creating temporary magnetic moments in the medical device to change the orientation of the medical device with respect to the static magnetic field, and orient the medical device in a selected direction within the operating region.
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Abstract
A method of magnetically manipulating a medical device within a body part of a human patient in conjunction with MR imaging includes applying a navigating magnetic field with magnets from the MR imaging device, and changing the magnetic moment of the medical device to change the orientation of the medical device within the body part
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Citations
37 Claims
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1. A method of navigating a medical device having a variable magnetic moment within an operating region within a patient, using an MR imaging device, the method comprising:
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applying a static magnetic field to the operating region with an external magnet of an MR imaging device;
creating temporary magnetic moments in the medical device to change the orientation of the medical device with respect to the static magnetic field, and orient the medical device in a selected direction within the operating region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of navigating a medical device within an operating region in the body of a patient, the medical device having at least one coil therein, the method comprising:
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establishing a navigating magnetic field in the operating region with an MR imaging device outside of the patient'"'"'s body;
selectively energizing the at least one coil in the medical device to create a magnetic moment in the medical device and creating a torque tending to align the magnetic moment of the magnetic medical device with the applied magnetic field. - View Dependent Claims (15, 16, 17)
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18. In a method of navigating a medical device by applying a static magnetic field and selectively changing the magnetic moment of the medical device to change the orientation of the medical device, a method of turning the medical device on a plane perpendicular to local applied field direction in two steps comprising applying a magnet current to the medical device to bend the medical device out of the plane of the desired turn and subsequently applying a magnet moment to the medical device to cause the medical device to turn back into the plane of the desired turn, in the desired orientation.
- 19. A system for navigating a medical device within an MRI consisting of a medical device containing at least one set of three orthogonal current carrying coils, power supplies for energizing said coils, a computer for controlling said power supplies, and an MRI images of the local environment of the coils, said images used by an operator to guide the movements of said medical device through a computer interface.
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25. A method for rotating a catheter tip containing a variable magnetic moment about the direction of an external magnetic field with which the moment interacts, the method consisting of directing the magnetic moment vector in a series of directions which successively rotate the catheter tip out of and into the plane perpendicular to the field direction.
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26. A method of navigating an elongate medical device within an operating region in the body of a patient, the medical device having a proximal end, a distal end, and at least one coil adjacent the distal end, the method comprising:
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introducing the distal end of the medical device into the operating region in the patient'"'"'s body;
establishing a navigating magnetic field in the operating region with a magnet of an MR imaging system;
selectively energizing the at least one coil adjacent the distal end of the elongate medical device to create a magnetic moment at the distal end of the elongate medical device to turn the distal end of the elongate medical device in the desired direction. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification