US 12,336,769 B2
Magnetic field sensor for a medical device
Kyle P. True, Minneapolis, MN (US); David A. Chizek, Brooklyn Park, MN (US); and Daniel J. Foster, Lino Lakes, MN (US)
Assigned to Boston Scientific Scimed, Inc., Maple Grove, MN (US)
Filed by Boston Scientific Scimed Inc., Maple Grove, MN (US)
Filed on May 18, 2022, as Appl. No. 17/747,269.
Claims priority of provisional application 63/190,537, filed on May 19, 2021.
Prior Publication US 2022/0370149 A1, Nov. 24, 2022
Int. Cl. A61B 34/20 (2016.01); G01R 33/032 (2006.01)
CPC A61B 34/20 (2016.02) [G01R 33/032 (2013.01); A61B 2034/2051 (2016.02); A61B 2034/2072 (2016.02)] 16 Claims
OG exemplary drawing
 
1. A magnetic field sensor for a medical device, the magnetic field sensor comprising:
a substrate having a plurality of planar sections, wherein adjacent planar sections are joined by a transition section, and wherein the planar sections are arranged in a substantially C-shaped arrangement such that an inner surface of the magnetic field sensor is concave, and wherein the plurality of planar sections includes a first planar section oriented in a first plane and a second planar section oriented in a second plane orthogonal to the first plane, and a third planar section oriented in a third plane, the third planar section adjacent the first planar section, wherein the C-shaped arrangement is complementary to a cylindrical shape of a medical device shaft such that the C-shaped arrangement can be integrated into an outer-most diameter portion of the medical device shaft;
a first magneto-resistive (MR) sensor mounted to the first planar section and defining a first primary sensing axis;
a second MR sensor mounted to the second planar section and defining a second primary sensing axis; and
wherein the inner surface is defined by a plurality of rigid caps disposed on the substrate, the plurality of rigid caps including a rigid first cap disposed over the first MR sensor, a rigid second cap disposed over the second MR sensor, and a rigid third cap over the third planar section.