Method of and system for controlling magnetic elements in the body using a gapped toroid magnet

• US 6,148,823 A
• Filed: 03/17/1999
• Issued: 11/21/2000
• Est. Priority Date: 03/17/1999
• Status: Expired due to Fees

• Current Assignee: Stereotaxis, Inc.
• Original Assignee: Stereotaxis, Inc.
• Inventors: Hastings, Roger N.
• Primary Examiner(s): Lacyk, John P.
• Application Number:
  US09/271,424
• Time in Patent Office: 615 Days
• Field of Search: 128/897-899, 600/9-15, 600/410, 600/424
• US Class Current: 128/897
• CPC Class Codes: A61B 2034/732 arranged around the patient, e.g. in a gantry
• CPC Class Codes: A61B 34/70 Manipulators specially adapted for use in surgery
• CPC Class Codes: A61B 34/73 Manipulators for magnetic surgery

Abstract

A system for controlling a magnetic element within a selected region of a patient'"'"'s body includes a magnet assembly comprising first and second mutually attracting, opposed magnet faces separated by a gap; and a magnet support for supporting the magnet assembly adjacent the selected region of the patient'"'"'s body to apply a magnetic field within the selected region, and moving the gap of the magnet assembly relative to the selected region of the patient'"'"'s body to change the magnetic field within the selected region. The method A method of controlling a magnetic element within a selected region of a patient'"'"'s body, the method comprising the controlled application of a magnetic field to the magnetic element in the selected region with a pair of mutually attracting opposed magnets separated by a gap.

Claims

1. A method of orienting a magnetic element within a selected region of a patient'"'"'s body, the method comprising the controlled application of a magnetic field to the magnetic element in the selected region with a pair of mutually attracting opposed magnets separated by a gap.

2. The method according to claim 1, wherein the magnetic field in the selected region is changed by relative movement between the region and the magnets.

3. The method according to claim 2, wherein the pair of opposed magnets are electromagnets.

4. The method according to claim 2, wherein the pair of opposed magnets are permanent magnets connected by a flux return path.

5. A method of orienting a magnetic element within a selected region of a patient'"'"'s body, the method comprising:

positioning a magnet assembly comprising two mutually attracting opposed magnets separated by a gap adjacent the selected region of the patient'"'"'s body; and

causing relative movement between the selected region and the magnet assembly to selectively change the magnetic field within the selected region in the vicinity of the magnetic element to orient the magnetic element.

6. The method according to claim 5, wherein the opposed magnets are electromagnets.

7. The method according to claim 5, wherein the opposed magnets are permanent magnets connected by a flux return path.

8. The method according to claim 5, wherein the step of positioning a magnet assembly adjacent the selected region comprises positioning the selected region of the patient'"'"'s body in the gap between the magnets.

9. A method of navigating a magnetic medical device within a selected region of a patient'"'"'s body, the method comprising:

introducing an elongate medical device having a magnetically responsive element associated with its distal end in to the patients body;

applying a magnetic field to the magnetically responsive element with a magnet assembly comprising a pair of mutually attracting opposed magnets separated by a gap to orient the distal end of the elongate medical device; and

advancing the elongate medical device in the direction of orientation of the distal end.

10. A method of navigating a magnetic element within a selected region of a patient'"'"'s body, the method comprising:

introducing the magnetic element into the selected region of the patient'"'"'s body;

positioning the selected region of the patient'"'"'s body in a gap between two mutually attracting opposed magnets, to thereby magnetically engage the magnetic element; and

causing relative movement between the two opposed magnets and the patient'"'"'s body to thereby move the magnetic element that is magnetically engaged by the opposed magnets within the selected region of the patient'"'"'s body.

11. The method according to claim 10 wherein the step of causing relative movement comprises moving the two opposed magnets relative to the patient'"'"'s body.

12. The method according to claim 10 wherein the step of causing relative movement comprises moving the patient relative to the magnet.

13. A method of targeting the delivery of a medical agent to a selected region of a patient'"'"'s body comprising:

introducing a magnetically active medical agent into the patient'"'"'s body;

positioning the portion of the patient'"'"'s body containing the selected region in a gap between two mutually attracting opposed magnets to concentrate the magnetically active medical agent in the portion of the body between the opposed magnets.

14. The method according to claim 13, wherein the medical agent comprises a therapeutic agent.

15. The method according to claim 13, wherein the medical agent comprises a diagnostic agent.

16. The method according to claim 13 wherein the medical agent is not inherently magnetically active, but is associated with a magnetically active substance.

17. The method according to claim 13 further comprising causing relative movement between the patient and the opposed magnets in such a way as to increase the amount of time that the selected region is located within the gap relative to the portions of the body surrounding the selected region.

18. The method according to claim 17 wherein the step of causing relative movement between the patient and the opposed magnets comprises moving the magnets relative to the patient.

19. The method according to claim 18 wherein the step of causing relative movement between the patient and the opposed magnets comprises rotating the magnets about a point in the selected region.

20. The method according to claim 13 wherein the opposed magnets are connected by a flux return path.

21. A method of moving a magnetic element within a selected region of a patient'"'"'s body, the method comprising the controlled application of a magnetic field to the magnetic element in the selected region with a pair of mutually attracting opposed magnets separated by a gap.

22. The method according to claim 21, wherein the magnetic field in the selected region is changed by relative movement between the region and the magnets.

23. The method according to claim 22, wherein the pair of opposed magnets are electromagnets.

24. The method according to claim 22, wherein the pair of opposed magnets are permanent magnets connected by a flux return path.

25. A method of moving a magnetic element within a selected region of a patient'"'"'s body, the method comprising:

positioning a magnet assembly comprising two mutually attracting opposed magnets separated by a gap adjacent the selected region of the patient'"'"'s body; and

causing relative movement between the selected region and the magnet assembly to selectively change the magnetic field within the selected region in the vicinity of the magnetic element to move the magnetic element.

26. The method according to claim 25 wherein the opposed magnets are electromagnets.

27. The method according to claim 25 wherein the opposed magnets are permanent magnets connected by a flux return path.

28. The method according to claim 25 wherein the step of positioning a magnet assembly adjacent the selected region comprises positioning the selected region of the patient'"'"'s body in the gap between the magnets.