Implant having three-dimensional shape for electrically stimulating a nerve structure
First Claim
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1. Implant for electrical stimulation of a nerve structure comprising:
- an electrically insulating substrate;
an array of cavities formed in an upper surface of the substrate, each cavity having a flared shape that expands from a bottom portion of said cavity toward the upper surface of the substrate;
stimulation electrodes, each arranged at the bottom portion of one of the cavities; and
an electrically conductive layer forming a ground plane at an upper portion of the cavities.
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Abstract
The invention relates to an implant which includes, in order to electrically stimulate a nerve structure, in particular the retina, an electrically insulating substrate (1), a array of recesses (2) formed in an upper surface of the substrate, stimulation electrodes (3) arranged at the bottom of the recesses, and an electrically conductive layer forming a ground plane (4) at the upper portion of the recesses. The sizes of the recesses and of the electrodes of the implant are such that the spatial selectivity of the stimulation current applied to the nerve structure is maximized.
10 Citations
31 Claims
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1. Implant for electrical stimulation of a nerve structure comprising:
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an electrically insulating substrate; an array of cavities formed in an upper surface of the substrate, each cavity having a flared shape that expands from a bottom portion of said cavity toward the upper surface of the substrate; stimulation electrodes, each arranged at the bottom portion of one of the cavities; and an electrically conductive layer forming a ground plane at an upper portion of the cavities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implant for electrical stimulation of a nerve structure comprising:
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an electrically insulating substrate; an array of cavities formed in an upper surface of the substrate, the cavities having a depth greater than 15 μ
m;stimulation electrodes, each arranged at a bottom portion of one of the cavities; and an electrically conductive layer forming a ground plane at an upper portion of the cavities. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. Implant for electrical stimulation of a nerve structure comprising:
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an electrically insulating substrate; an array of cavities formed in an upper surface of the substrate, the cavities having a depth lower than 50 μ
m;stimulation electrodes, each arranged at a bottom portion of one of the cavities; and an electrically conductive layer forming a ground plane at an upper portion of the cavities. - View Dependent Claims (19, 20, 21, 22, 23)
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24. Implant for electrical stimulation of a nerve structure comprising:
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an electrically insulating substrate; an array of cavities formed in an upper surface of the substrate; stimulation electrodes, each arranged at a bottom portion of one of the cavities and having, on a bottom surface of said one of the cavities, a dimension of less than 60 μ
m; andan electrically conductive layer forming a ground plane at an upper portion of the cavities. - View Dependent Claims (25, 26, 27, 28)
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29. Implant for electrical stimulation of a nerve structure comprising:
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an electrically insulating substrate; an array of cavities formed in an upper surface of the substrate; stimulation electrodes, each arranged at a bottom portion of one of the cavities and having a central part extending over a bottom surface of said one of the cavities and a peripheral part overlapping lateral walls of said one of the cavities, said central part having a dimension of less than 40 μ
m; andan electrically conductive layer forming a ground plane at an upper portion of the cavities. - View Dependent Claims (30)
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31. Implant for electrical stimulation of a nerve structure comprising:
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an electrically insulating substrate; an array of cavities formed in an upper surface of the substrate; stimulation electrodes, each arranged at a bottom portion of one of the cavities; and an electrically conductive layer forming a ground plane at an upper portion of the cavities and comprising, for each cavity of the array, a part overlapping lateral walls of said cavity.
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Specification