Patent ID: 8335571

Claim:
An implantable intravascular medical device comprising: a structure that defines a form factor having an elongate geometry including a form factor length and a cross-section defined perpendicularly to the form factor length; and a circuit situated within the form factor and including an inductive element; wherein the inductive element includes: a core of magnetic material having a core length and a core cross-section defined perpendicularly to the length; and a coil having a plurality of windings that define a loop area; wherein a portion of the core is situated in the loop area such that the coil, when energized, produces a magnetic flux in the core along a forward path and a return path; and wherein a sum of a total cross-sectional area of the magnetic flux in the forward path and a total cross-sectional area of the magnetic flux in the return path is greater than an area of the core cross-section.