Implantable lead having a variable coil conductor pitch
US8731685B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 2008 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Sep 3, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2001/0092
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.