STYLET FOR USE WITH IMAGE GUIDED SYSTEMS

• US 20100130851A1
• Filed: 11/21/2008
• Published: 05/27/2010
• Est. Priority Date: 11/21/2008
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Matheson, Ian, Neidert, Michael R.
• Granted Patent: US 8,204,574 B2
• Time in Patent Office: Days
• US Class Current: 600/424
• CPC Class Codes: A61B 2034/2051 Electromagnetic tracking systems
• CPC Class Codes: A61B 2090/397 electromagnetic other than visible, e.g. microwave
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61B 5/06 Devices, other than using radiation, for detecting or locating foreign bodies for removing same A61B17/50 ; determining position of probes within or on the body of the patient
• CPC Class Codes: A61B 5/062 using magnetic field

Abstract

A stylet for an image guided system, which includes a locating device and which is operable for emitting an electromagnetic field for locating the stylet. The stylet includes a flexible elongate member, an electrically conductive member, and a reinforcement member. The reinforcement member is disposed inside the electrically conductive member and is made out of a magnetic material. The reinforcement member reinforces the stylet and provides electrical communication between the conductive member and the locating device such that current induced in the conductive member is transmitted to the locating device via the reinforcement member.

Claims

1. A stylet for an image guided system, the image guided system including a locating device and operable for emitting an electromagnetic field for locating the stylet, the stylet comprising:

a flexible elongate member;

an electrically conductive member operatively secured over the flexible elongate member so as to encompass the flexible elongate member; and

a reinforcement member operatively secured to the flexible elongate member and which is disposed inside the electrically conductive member, the reinforcement member made of a magnetic material, the reinforcement member reinforcing the stylet and providing electrical communication between the electrically conductive member and the locating device such that current induced in the electrically conductive member due to the electromagnetic field is transmitted to the locating device via the reinforcement member.

2. The stylet of claim 1, wherein the electrically conductive member is a coil.

3. The stylet of claim 1, wherein the electrically conductive member includes a positive lead and a negative lead, wherein the reinforcement member includes a first member in electrical communication with the positive lead and a second member in electrical communication with the negative lead, the first member and second members being electrically insulated from each other.

4. The stylet of claim 3, wherein the first and second member are disposed in a substantially symmetric manner relative to a longitudinal axis of the flexible elongate member.

5. The stylet of claim 4, wherein the first and second members each include a flat surface, wherein the flat surfaces of the first and second members substantially oppose each other on opposite sides of the longitudinal axis.

6. The stylet of claim 5, wherein the first and second members each have a substantially D-shaped cross section.

7. The stylet of claim 3, wherein the flexible elongate member includes a partition wall disposed between the first and second members.

8. The stylet of claim 3, further comprising an electrically insulating coating provided between the first and second members.

9. The stylet of claim 1, wherein at least one of the flexible elongate member and the reinforcement member defines a recess, and the electrically conductive member is disposed within the recess.

10. The stylet of claim 1, wherein the electrically conductive member includes a plurality of helical layers.

11. The stylet of claim 1, wherein the flexible elongate member includes an aperture through which a lead of the electrically conductive member extends to electrically connect to the reinforcement member.

12. The stylet of claim 11, further comprising an adhesive that operatively secures the lead to the flexible elongate member.

13. The stylet of claim 1, wherein the flexible elongate member is disposed between the electrically conductive member and the reinforcement member.

14. The stylet of claim 1, further comprising an outer sheath that substantially encompasses the electrically conductive member, the flexible elongate member, and the reinforcement member.

15. The stylet of claim 1, wherein the electrically conductive member is disposed adjacent a first end of the flexible elongate member, and further comprising an electrical connector disposed adjacent a second end of the flexible elongate member, and wherein the reinforcement member extends generally between the first and second end of the flexible elongate member.

16. The stylet of claim 1, wherein the flexible tube, the electrically conductive member, and the reinforcement member are operable to be removably secured to a pacemaker lead.

17. A method for positioning a medical device comprising:

electrically connecting an electrically conductive member of a stylet to a locating device via a reinforcement member, the reinforcement member being made of a magnetic material and which is disposed inside the electrically conductive member;

emitting an electromagnetic field relative to the stylet to induce a current in the electrically conductive member;

detecting the current in the electrically conductive member with the locating device to locate the stylet; and

positioning the medical device relative to the stylet.

18. The method of claim 17, further comprising removing the stylet from the medical device after positioning the medical device.

19. The method of claim 17, further comprising varying the electromagnetic field.

20. An image guided system comprising:

a locating device;

a field generator operable for emitting an oscillating electromagnetic field;

a medical device defining a channel therein; and

a stylet removably disposed within the channel, the stylet including a reinforcement member having a first member and a second member that are electrically insulated from each other and that are each made out of a magnetic material, a flexible elongate member covering the reinforcement member, a coil wound about the flexible elongate member and the reinforcement member, and an outer sheath that substantially encompasses the coil, the flexible elongate member, and the reinforcement member, wherein the reinforcement member reinforces the stylet, the first member being electrically connected to a positive lead of the coil and the locating device, the second member being electrically connected to a negative lead of the coil and the locating device such that current induced in the coil due to the oscillating electromagnetic field is transmitted to the locating device via the reinforcement member, the locating device operable to detect the location of the medical device based on the current induced in the coil.