MAGNETIC TARGETING SYSTEM FOR FACILITATING NAVIGATION

• US 20090082666A1
• Filed: 06/10/2008
• Published: 03/26/2009
• Est. Priority Date: 08/04/2006
• Status: Active Grant

• Current Assignee: Nuvasive Incorporated
• Original Assignee: Magrod, LLC
• Inventors: Walsh, Christopher, Geist, Wyatt Drake
• Granted Patent: US 7,976,546 B2
• Time in Patent Office: Days
• US Class Current: 600/424
• CPC Class Codes: A61B 17/7083 Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements
• CPC Class Codes: A61B 17/7085 for insertion of a longitudinal element down one or more hollow screw or hook extensions, i.e. at least a part of the element within an extension has a component of movement parallel to the extension's axis
• CPC Class Codes: A61B 17/7089 wherein insertion is along an arcuate path
• CPC Class Codes: A61B 2017/00199 with a console, e.g. a control panel with a display
• CPC Class Codes: A61B 2017/003 Steerable
• CPC Class Codes: A61B 34/70 Manipulators specially adapted for use in surgery
• CPC Class Codes: A61B 34/73 Manipulators for magnetic surgery

Abstract

The present invention describes a magnetic targeting system suitable for guiding a biocompatible device to a target area within the body (in vivo) and method of using the same. The system includes a targeting member having a steering material and is attached to the biocompatible device. The system also includes at least one anchoring member constructed and arranged for the inclusion of a magnetic material effective for influencing the traversal of the steering material, in vivo. The magnetic material is configured and sized so as to positionable external of the anchoring member, in vivo. The magnetically influenced anchoring member interacts with the targeting member such that the biocompatible device is positionable relative to the target area. An extender and connector have threads indexed to a securing set screw to facilitate positioning and affixation of the biocompatible material

Claims

1. A magnetic targeting system suitable for facilitating navigation to a target area located in vivo, said system comprising:

a targeting member having a first end and a second end, said second end constructed and arranged for attachment to a biocompatible device and at least said first end includes a steering material influenced by a magnetic field; and

at least one anchoring member having a proximal end and a distal end, said distal end constructed and arranged to secure to a target area located in vivo, wherein said proximal end is constructed and arranged for inclusion of a magnetic material effective for influencing the traversal of said steering material in vivo; and

a extender having a first open end and second open end and a cavity there between, the first open end of said extender being removably attached to said proximal end of said at least one anchoring member, said extender including a passageway, adjacent the first open end, between said cavity and an external surface of said extender, and, the second open end of said extender protruding a distance outside of a percutaneous exposure created the outer skin of a patient;

said magnetic material is sized and shaped to enter the extender at the second open end and move within said cavity to a position adjacent the first open end of the extender and to move through said passageway such that at least a portion of said magnetic material extends to a location external of said extender,

whereby, the magnetically influenced proximal end of said anchoring member interacts with said first end of said targeting member such that said connected biocompatible device is positionable relative to said target area.

2. The magnetic targeting system of claim 1, wherein said at least one anchoring members includes a plurality of anchoring members each capable of independently influencing said target member by inclusion of said magnetic material.

3. The magnetic targeting system of claim 1, wherein said system includes a real-time feedback mechanism to verify location in vivo of said biocompatible device.

4. The magnetic targeting system of claim 3, wherein said real-time feedback mechanism includes tactile feedback to verify location in vivo of said biocompatible device.

5. The magnetic targeting system of claim 1, wherein said magnetic material is a permanent magnet.

6. The magnetic targeting system of claim 1, wherein said magnetic material is mounted a distal end of a wand, the magnetic material is in the form of a magnetic catcher, the magnetic wand and magnetic catcher are sized to fit within the passageway of said extender, the magnetic catcher can be turned within the extender upon rotation of said rod and moved to position that extends outwardly of said passageway and into the patient, whereby said catcher is then in a preferred position to attract and align the targeting member.

7. The magnetic targeting system of claim 1, wherein said magnetic material is mounted on a wand that includes a hand holding grip and a trigger like component pivotally attached thereto, said hand holding grip member includes an first elongated rod like member, an additional elongated rod like member is positioned adjacent said first elongated rod member and is pivotally connected to said trigger like component and is also pivotally connected to said magnetic material through a pivot at an opposite end, said magnetic material is also pivotally connected to said additional elongated rod, whereby pivotal motion of trigger like component relative to said hand grip causes relative axial displacement of said first rod like member with respect to said additional rod like member, and, said relative displacement will result in the pivotal movement of said magnetic material.

8. The magnetic targeting system of claim 1 wherein said magnetic material is pivotally attached to a hand held rod at one end and is mounted in a cylindrical housing at the opposite end, said housing includes a push button actuator, whereby depression of push button actuator causes pivotal motion of said magnetic material such that it may swing to a position external of said extender.

9. The magnetic targeting system of claim 1 wherein said biocompatible device is an implant or surgical instrument.

10. The magnetic targeting system of claim 1 wherein said biocompatible device is formed from a material selected from the group consisting of rigid, semi-rigid, or flexible material.

11. The magnetic targeting system of claim 2, wherein said anchor member is a fastener for attaching to a bony structure and said biocompatible device is configured to connect a plurality of anchor members.

12. The magnetic targeting system of claim 1, wherein said targeting member is positionable and mounted on a leading end of a free hand inserter, said targeting member is held in position adjacent said free hand inserter by a tether which is releasably secured to said free hand inserter.

13. The magnetic targeting system of claim 1, wherein said targeting member to positionable and mounted on a leading end of said biocompatible device which in turn is mounted on the leading end of a free hand inserter, said targeting member is held in place by a tether which passes through said biocompatible device and is releasably secured to said free hand inserter.

14. The magnetic targeting system of claim 12, wherein the biocompatible material is released from the tether using a break away connection.

15. The magnetic targeting system of claim 10, wherein the biocompatible material is released from the tether using a break away connection.

16. A magnetic targeting system suitable for facilitating navigation to a target area located in vi vo, said system comprising:

a targeting member having a first end and a second end, said second end constructed and arranged for attachment to a biocompatible device and at least said first end includes a steering material influenced by a magnetic field;

said biocompatible device is a cannulated rod; and

at least one anchoring member having a proximal end and a distal end, said distal end constructed and arranged to secure to a target area located in vivo, wherein said proximal end is constructed and arranged for inclusion of a magnetic material effective for influencing the traversal of said steering material in vivo;

whereby, the magnetically influenced proximal end of said anchoring member interacts with said first end of said targeting member such that said connected biocompatible device is positionable relative to said target area.

17. The magnetic targeting system of claim 16, further including a plate and block assembly adapted to receive a plurality of extenders in a fixed position such that the location of the extending passageways are projected to location external of the patient whereby the surgeon can then proceed to shape the cannulated rod in a manner presented by an upper surface of the extender tubes which allows the surgeon to more easily pass the cannulated rod through extender passageways located in said extender tubes.

18. A magnetic targeting system suitable for facilitating navigation to a target area located in vivo, said system comprising:

a targeting member having a first end and a second end, said second end constructed and arranged for attachment to a biocompatible device and at least said first end includes a steering material influenced by a magnetic field; and

at least one anchoring member having a proximal end and a distal end, said distal end constructed and arranged to secure to a target area located in vivo, wherein said proximal end is constructed and arranged for inclusion of a magnetic material effective for influencing the traversal of said steering material in vivo;

an extender having a first open end and second open end and a cavity there between, the first open end of said extender being removably attached to said proximal end of said at least one anchoring member, said cavity having threads extending from said first open end to said second open end, said extender including a passageway, adjacent the first open end, between said cavity and an external surface of said extender, and, the second open end of said extender protruding a distance outside of a percutaneous exposure created the outer skin of a patient;

whereby, the magnetically influenced proximal end of said anchoring member interacts with said first end of said targeting member such that said connected biocompatible device is positionable relative to said target area.

19. The magnetic targeting system of claim 18, wherein said anchoring member includes a connector member, said connector member includes a threaded portion that is indexed to the threads within said cavity, said cavity threads and said connector threads being in juxtaposed relationship.

20. The magnetic targeting system of claim 19, further including a threaded set screw, said threaded set screw having threads that are indexed to the threads within said cavity and on the threaded portion of the connector member, said set screw threadably engages the threads of the inner cavity and is threaded down said inner cavity of said extender from the second open end towards the first open end until it reaches the threads on the threaded portion on the connector member the threads within the cavity and the threads on the connector member are indexed to one another such that the set screw can continue to be threadably lowered into the connector member.

21. The magnetic targeting system of claim 20, wherein the biocompatible device is fastened to said connector member by said set screw.

22. A method for facilitating navigation to a target area in vivo, said steps comprising:

providing a targeting member having a first end and a second end, said second end attached to a biocompatible device, wherein said first end includes a steering material influenced by a magnetic field;

attaching to a target area in vivo at least one anchoring member having a proximal end and a distal end, wherein said anchoring member is attached to said target area at its distal end; and

introducing a magnetic material into said proximal end of said anchoring member and moving at least a portion of said material to a position outside of the anchoring member thereby influencing the traversal of said steering material, and positioning said biocompatible device relative to said target area.

23. The method as set forth in claim 22, wherein said at least one anchoring members includes a plurality of anchoring members each capable of independently influencing said target member by inclusion of said magnetic material.

24. The method as set forth in claim 22, wherein said system includes a real-time feedback mechanism to verify location in vivo of said biocompatible device.

25. The method as set forth in claim 24, wherein said real-time feedback mechanism includes tactile feedback to verify location in vivo of said biocompatible device.

26. The method as set forth in claim 22, wherein said magnetic material is a permanent magnet.

27. The method as set forth in claim 22 wherein said biocompatible device is an implant or surgical instrument.

28. The method as set forth in claim 22 wherein said biocompatible device is formed from a material selected from the group consisting of rigid, semi-rigid, or flexible material.

29. The method as set forth in claim 23, wherein said anchor member is a fastener for attaching to a bony structure and said biocompatible device is configured to connect a plurality of anchor members.

30. The method as set forth in claim 22, wherein said targeting member is formed from a material selected from the group consisting of rigid, semi-rigid, or flexible.