MRI-safe electro-magnetic tranducer
First Claim
1. An electro-magnetic transducer comprising:
- a housing;
at least one coil associated with the housing;
a spherical magnet within the housing, the magnet substantially restricted within the housing to rotation in any direction and movement along an axis;
a first keeper and a second keeper positioned adjacent to, and on opposite sides of the magnet, both the first keeper and the second keeper capable of moving within the housing along the axis and including magnetically soft material.
1 Assignment
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Accused Products
Abstract
An electro-magnetic transducer includes a housing. At least one coil is associated with the housing. A spherical magnet within the housing is capable of turning in any direction and of moving along an axis. A first keeper and a second keeper are positioned on opposite sides of the magnet, both the first keeper and the second keeper including magnetically soft material and free to move along the axis. A first biasing member holds the first keeper along the axis, and a second biasing element that holds the second keeper along the axis. The first keeper and the second keeper are attracted by magnetic poles of the magnet in the absence of an external magnetic field, such that opposing magnetic poles of the magnet are aligned parallel to the axis. Alternating current flowing through the at least one coil causes a vibration of the magnet, the vibration transferred to the housing.
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Citations
14 Claims
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1. An electro-magnetic transducer comprising:
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a housing; at least one coil associated with the housing; a spherical magnet within the housing, the magnet substantially restricted within the housing to rotation in any direction and movement along an axis; a first keeper and a second keeper positioned adjacent to, and on opposite sides of the magnet, both the first keeper and the second keeper capable of moving within the housing along the axis and including magnetically soft material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electro-magnetic transducer comprising:
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a housing; a plurality of coils associated with the housing;
the plurality of coils including a first and second outer coil, and a middle coil positioned between the first and second outer coils, wherein the middle coil is winded in a direction opposite the two outer coils, and wherein the number of loops of the middle coil equals the sum of loops of the first and second outer coils, wherein the induced voltage of the plurality of coils arising from an external RF field is zero;a spherical magnet within the housing, the magnet substantially restricted to rotation in any direction and movement along an axis; and a first keeper and a second keeper positioned on opposite sides of the magnet, both the first keeper and the second keeper including magnetically soft material.
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Specification