Dissipation Device and MRI-Safe Catheter System

• US 20110263966A1
• Filed: 04/19/2011
• Published: 10/27/2011
• Est. Priority Date: 04/26/2010
• Status: Active Grant

• Current Assignee: Vascomed GMBH (Micro Systems Technologies Management AG)
• Original Assignee: Biotronik VI Patent AG (Biotronik SE & Company KG)
• Inventors: Geistert, Wolfgang, Flach, Erhard, Weiss, Ingo
• Granted Patent: US 9,167,966 B2
• Time in Patent Office: Days
• US Class Current: 600/411
• CPC Class Codes: A61B 2562/182 Electrical shielding, e.g. using a Faraday cage
• CPC Class Codes: A61B 5/00 Measuring for diagnostic purposes radiation diagnosis A61B6/00; diagnosis by ultrasonic, sonic or infrasonic waves A61B8/00; Identification of persons
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/086 Magnetic resonance imaging [MRI] compatible leads
• CPC Class Codes: G01R 33/288 Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room

Abstract

A dissipation device having a proximal end, which is located outside the body, and a distal end, which is suited in particular for elongate medical instruments, in particular electrophysiological catheters or temporary electrode leads, placed temporarily in the body. The dissipation device including a dissipation sleeve which extends from the proximal end to the distal end of the dissipation device, and a lumen which extends from the proximal end to the distal end, and in which the instrument can be displaceably guided, wherein the lumen is enclosed by the dissipation sleeve. The dissipation device is characterized in that the dissipation sleeve is composed, at least partially, of electrically conductive material, and/or the dissipation sleeve includes dissipation means composed of electrically conductive material and, therefore, the dissipation sleeve is designed to dissipate or divert electrical energy induced by electromagnetic radiation.

Claims

1. A dissipation device having a proximal end, which is outside of the body, and a distal end, which is suited for elongate medical instruments placed temporarily in the body, the dissipation device comprising:

a dissipation sleeve which extends from the proximal end to the distal end of the dissipation device; and

a lumen which extends from the proximal end to the distal end, and in which the elongate medical instrument can be displaceably guided, wherein the lumen is enclosed by the dissipation sleeve,

wherein the dissipation sleeve is composed, at least partially, of electrically conductive material, and/or wherein the dissipation sleeve comprises a dissipation means composed of electrically conductive material, such that the dissipation sleeve is designed to dissipate or divert electrical energy induced by electromagnetic radiation.

2. The dissipation device according to claim 1, wherein the electrically conductive material is a polymer matrix in which conductive particles are embedded, and wherein the conductive particles have an elongate shape and a length-to-width or length-to-diameter ratio greater than 2.

3. The dissipation device according to claim 2, where the conductive particles have a length-to-width or length-to-diameter ratio greater than 100.

4. The dissipation device according to claim 2, wherein the polymer matrix comprises silicone, polyurethane, and/or Peba, and wherein the conductive particles comprise carbon, carbon black, carbon fibers, carbon nanoparticles, metal-coated carbon particles, carbon nanotubes, conductive carbon black, and/or metal particles.

5. The dissipation device according to claim 1, wherein the dissipation sleeve comprises a first distal dissipation section and a second proximal dissipation section, wherein the second proximal dissipation section is supported such that it is displaceable relative to the first distal dissipation section, in order to optimize the length of the dissipation device and, therefore, the protective length of the dissipation device such that the protective effect is maximized.

6. The dissipation device according to claim 5, wherein the second proximal dissipation section comprises a guide which displaceably guides the first distal dissipation section in a fluid-tight manner.

7. The dissipation device according to claim 1, wherein the conductive material is formed of a metal including a metal braid, a metal coil, or a metal profile, and wherein the dissipation means is embedded at least partially in the dissipation sleeve.

8. The dissipation device according to claim 7, wherein the metal comprises a biocompatible metal.

9. The dissipation device according to claim 1, wherein the dissipation sleeve or the dissipation means, or both, can be electrically coupled, at least in sections, galvanically or capacitively to the body tissue enclosing the dissipation device, to dissipate or divert the electrical energy induced by electromagnetic radiation to the surrounding body tissue.

10. The dissipation device according to claim 1, wherein the dissipation sleeve or the dissipation means, or both, are electrically decoupled, at least in sections, from the body tissue surrounding the dissipation device, and wherein the dissipation device comprises a connecting means on the proximal end, which is electrically connected to the dissipation means to galvanically or capacitively dissipate or divert the electrical energy induced by electromagnetic radiation to an antipole located outside the body.

11. The dissipation device according to claim 10, wherein the dissipation sleeve comprises first and second dissipation sections, each having proximal and distal ends, wherein the connecting means is located on the proximal end of the second dissipation section, and wherein a second dissipation means comprises an electrical connector on the distal end of the second dissipation section, which is suited for absorbing the energy absorbed by the first dissipation section, and likewise dissipating the same via the connecting means.

12. The dissipation device according to claim 10, further comprising an antipole provided as a device for dissipating energy, wherein said device is provided for the shielding of the booth of the MR diagnostic device, the high-frequency shield of the scanner, the shield of an electrophysiological ablation device, or the potential of the neutral electrode of the electrophysiological ablation system.

13. The dissipation device according to claim 10, wherein the connecting means, provided in addition or as an alternative to the antipole, can be electrically connected to a high-frequency generator, the amplitude and phase of which is adjustable, for compensating energy input.

14. The dissipation device according to claim 13, wherein a matching network comprised of RLC elements or transformers or combinations thereof is provided between the connecting means, the antipole, or the high-frequency generator, or combinations thereof, which ensures the dissipation or diversion of energy is optimized.

15. A system for treating the human body, the system comprising a dissipation device according to claim 1, and an elongate medical instrument placed temporarily in the body, the elongate medical instrument comprising a first region which can be inserted into the human body, which has a distal end, and a second region which has a proximal end and is located outside the body, and comprising at least one galvanically electrically conductive structure, wherein the elongate medical instrument is displaceably supported in the dissipation device, and wherein the dissipation device encloses the first region of the medical instrument, at least in sections.

16. The system according to claim 15, wherein the non-enclosed section of the elongate medical instrument, between the distal end thereof and the distal end of the dissipation device, is less than ¼

of the wavelength of an incident high-frequency wave.

17. The system according to claim 15, wherein the non-enclosed section of the elongate medical instrument, between the distal end thereof and the distal end of the dissipation device, is less than 1/10 of the wavelength of an incident high-frequency wave.

18. The system according to claim 15, wherein the dissipation device further comprises a locking device which can be used to detachably lock the elongate medical instrument such that the elongate medical instrument is prevented from being displaced in the dissipation device.