Leads with high surface resistance
AssigneeCardiac Pacemakers, Inc.
InventorsYingbo Li, Masoud Ameri
Life of this patent
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Abstract
Implantable medical leads having resistance characteristics adapted to dissipate radio frequency (RF) electromagnetic energy during medical procedures such as magnetic resonance imaging (MRI) are disclosed. An illustrative medical device includes a lead having an inner electrical conductor operatively coupled to an electrode and a pulse generator, and one or more outer resistive shields that radially surround the inner conductor and dissipate RF energy into the surrounding body tissue along the length of the lead.
Claims20
An implantable medical lead for use in a magnetic resonance imaging (MRI) environment, the lead comprising:
- a lead having a proximal portion, a distal portion having an electrode, and a conductor wire;
- the conductor wire having a center portion and an outer portion, the conductor wire having a resistivity that increases across a width of the conductor wire such that the resistivity of the conductor wire is greater at the outer portion than at the center portion;
- and
- wherein the increasing resistivity across the width of the conductor wire is configured to dissipate RF electromagnetic energy received along the lead and inhibit alternating current from being transmitted to the electrode.
An implantable medical lead for use in a magnetic resonance imaging (MRI) environment, the lead comprising:
- a lead having a proximal portion, a distal portion having an electrode, and a conductor wire that extends from the proximal portion to the distal portion and electrically connects with the electrode;
- the conductor wire having a center portion and an outer portion, the conductor wire having a resistivity that changes across a width of the conductor wire such that the resistivity of the conductor wire is different between the outer portion and the center portion;
- and
- wherein the changing resistivity across the width of the conductor wire is configured to dissipate RF electromagnetic energy received along the lead and inhibit alternating current from being transmitted to the electrode.
Dependencies are inferred from the claim text.