Housing for an implantable medical device
First Claim
1. A housing for a microstimulator adapted to be implanted in body tissue by expulsion through a hypodermic needle, the microstimulator housing comprising:
- a cylindrical tube formed as a unitary structure solely of ferrite, said ferrite tube having a length, said ferrite tube further having an interior region adapted to receive microstimulator circuit elements;
an electrically conductive coil wound around an outer surface of said ferrite tube; and
an outer, cylindrical protective sleeve encasing the ferrite tube and the coil, the sleeve being formed of a non-magnetic material impervious to body fluids and having opposed, sealed ends so as to isolate the ferrite tube from contact with said body fluids.
1 Assignment
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Accused Products
Abstract
A housing for an implantable medical device in the shape of a hollow magnetic field concentrating tube about which an electrically conductive wire coil is wound and within which medical device electronics is housed. The tube, preferably made of ferrite, is encased in a protective sleeve formed of a material that is impervious to body fluids. The coil provides an electrical output as a result of being exposed to a varying magnetic field that is concentrated around the coil by virtue of the field concentrating tube. The output of the coil is utilized as part of a power supply for the medical device electronics. The sleeve has a generally cylindrical cross-section having an outside diameter of about 3.175 mm and an axial length in the range of about 3.2 mm to 8 mm.
57 Citations
25 Claims
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1. A housing for a microstimulator adapted to be implanted in body tissue by expulsion through a hypodermic needle, the microstimulator housing comprising:
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a cylindrical tube formed as a unitary structure solely of ferrite, said ferrite tube having a length, said ferrite tube further having an interior region adapted to receive microstimulator circuit elements; an electrically conductive coil wound around an outer surface of said ferrite tube; and an outer, cylindrical protective sleeve encasing the ferrite tube and the coil, the sleeve being formed of a non-magnetic material impervious to body fluids and having opposed, sealed ends so as to isolate the ferrite tube from contact with said body fluids. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A microstimulator adapted to be implanted in body tissue by expulsion through a hypodermic needle, the microstimulator comprising:
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an elongated cylindrical tube formed as a unitary structure solely of ferrite and having an interior region; an electrically conductive coil wound around an outer surface of said ferrite tube; microstimulator circuit elements disposed substantially completely within the confines of said interior region of said ferrite tube, said coil being adapted to electrically communicate with said microstimulator circuit elements; and an outer, cylindrical, protective sleeve encasing the ferrite tube and the coil, the sleeve having an outer configuration facilitating implantation of said microstimulator through said hypodermic needle, the sleeve being formed of a non-magnetic material impervious to body fluids and having opposed sealed ends so as to isolate the ferrite tube and the coil from contact with said body fluids. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification