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;
energizing at least one electromagnetic coil overlapping another electromagnetic coil of the medical device to create 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.
323 Citations
21 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;
energizing at least one electromagnetic coil overlapping another electromagnetic coil of the medical device to create 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; and
actively removing heat from the at least one coil through the medical device. - View Dependent Claims (15, 16, 17)
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18. 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;
wherein the medical device comprises at least two sets of three current carrying coils, and creating temporary magnetic moments in the medical device comprises applying current to one or more of the current carrying coils.
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19. 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; and
applying electrical energy to create temporary magnetic moments in one or more coils 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; and
actively controlling heat resulting from applying the electrical energy in the medical device. - View Dependent Claims (20, 21)
carrying a heat exchange medium into the medical device; and
cooling the heat exchange medium leaving the medical device.
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Specification