Magnetic resonant imaging safe stylus
First Claim
1. A stylus, comprising:
- a plurality of stylus modules, at least one of the plurality of stylus modules comprising;
a core rod formed of silicon carbide (SiC) material that extends a distance along a longitudinal axis of the core rod;
a recording array mounted on at least a portion of a peripheral surface of the core rod that extends substantially in a direction of the longitudinal axis of the core rod, the recording array comprising at least one electrode formed through ion implantation of a doped substrate of SiC material; and
a stimulation array mounted at a distal end of the core rod, the stimulation array including at least one stimulation electrode that extends at least in part perpendicularly to the direction of the longitudinal axis of the core rod;
a hemispherical cap formed of SiC material positioned proximate to a distal end of one of the plurality of stylus modules; and
a hermetic seal that seals the plurality of stylus modules from exposure to body tissue.
1 Assignment
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Accused Products
Abstract
An implantable magnetic resonant imaging (MRI) safe stylus for biomedical devices is described. In one example, the stylus includes a set of stylus modules. One or more of the stylus modules includes a core rod formed of silicon carbide (SiC) material, a recording array mounted on the core rod, and a stimulation array mounted at a distal end of the core rod. The stylus also includes a hemispherical cap formed of SiC material. In part due to the construction and choice of materials used in the stylus, it does not substantially couple with electromagnetic fields during an MRI, for example. Therefore, the stylus does not produce excessive additional heat. The designs described herein also rely on the high thermal transport but low heat capacity of SiC to provide a thermal pathway which will conduct induced heat throughout the stylus, to dissipate heat more evenly.
31 Citations
20 Claims
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1. A stylus, comprising:
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a plurality of stylus modules, at least one of the plurality of stylus modules comprising; a core rod formed of silicon carbide (SiC) material that extends a distance along a longitudinal axis of the core rod; a recording array mounted on at least a portion of a peripheral surface of the core rod that extends substantially in a direction of the longitudinal axis of the core rod, the recording array comprising at least one electrode formed through ion implantation of a doped substrate of SiC material; and a stimulation array mounted at a distal end of the core rod, the stimulation array including at least one stimulation electrode that extends at least in part perpendicularly to the direction of the longitudinal axis of the core rod; a hemispherical cap formed of SiC material positioned proximate to a distal end of one of the plurality of stylus modules; and a hermetic seal that seals the plurality of stylus modules from exposure to body tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A stylus module, comprising:
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a core rod formed of silicon carbide (SiC) material that extends a distance along a longitudinal axis of the core rod; a recording array comprising a plurality of recording electrodes mounted on at least a portion of a peripheral surface of the core rod, wherein each of the plurality of recording electrodes comprises an electrode formed through ion implantation of a doped substrate of SiC material and respectively extend substantially in a direction of a longitudinal axis of the core rod; a stimulation array mounted at a distal end of the core rod; and a hermetic seal that seals the core rod and recording array from exposure to body tissue. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A stylus, comprising:
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a plurality of stylus modules, at least one of the plurality of stylus modules comprising; a core rod formed of silicon carbide (SiC) material that extends a distance along a longitudinal axis of the core rod; a recording array comprising a plurality of recording electrodes mounted on at least a portion of a peripheral surface of the core rod, wherein each of the plurality of recording electrodes comprises an electrode formed through ion implantation of a doped substrate of SiC material; and a stimulation array formed of SiC material, the stimulation array including at least one stimulation electrode; a hemispherical cap formed of SiC material positioned proximate to a distal end of one of the plurality of stylus modules; and a hermetic seal that seals the plurality of stylus modules from exposure to body tissue. - View Dependent Claims (18, 19, 20)
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Specification