Title:
可変コイル導体ピッチを有する移植可能リード線
Document Type and Number:
Japanese Patent JP2011504405
Kind Code:
A
Abstract:
Systems and methods for shielding implantable leads from magnetic fields during medical procedures such as magnetic resonance imaging (MRI) are described. In various embodiments, the lead includes an inner conductor that is helically shaped and radially surrounded, at least in part, by one or more outer shielding conductors. The pitch of the inner conductor, and in some cases also the outer conductor, can be varied (e.g., continuously or at certain points) along the length of the lead, forming a plurality of high impedance points along the length of the lead which result in the dissipation of electromagnetic energy at an interrogation frequency of a magnetic resonance imaging device (e.g., 64 MHz, 128 MHz, or the like). In some embodiments, the variance in the pitch of the inner conductor follows a sinusoidal function, a modified square-wave function, or some other repeating pattern.
Inventors:
Ameri, sword
Application Number:
JP2010535129A
Publication Date:
February 10, 2011
Filing Date:
December 04, 2008
Export Citation:
Assignee:
Cardiac Pacemakers, Inc.
International Classes:
A61N1/05; A61B5/055; A61N1/36
Domestic Patent References:
| JP2004141679A | 2004-05-20 |
Attorney, Agent or Firm:
Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita
Takaaki Yasumura
Natsuki Morishita