Flexible antenna on flexible substrate with adhesive back
A medical device may be configured to transmit energy from a position outside of a subject's body to a position inside the subject's body. The device may include a flexible substrate having a thickness of between 5 and 100 micrometers and a flexible antenna comprising between 10 and 15 windings on a first surface of the flexible substrate, the antenna having a transmission frequency of between 6.4 to 8.3 MHz, and wherein the antenna is configured to transmit energy to a penetration depth of at least 1 cm into the subject's body. The device may also include an adhesive disposed on at least one surface of the flexible substrate for adhering to skin of the subject.
1. A device for treating sleep apnea in cooperation with an implant located proximate a geneoglossal muscle of a subject, the device comprising:
a flexible substrate being configured for location on the subject's skin between a neck and a chin of a subject, the flexible substrate having a thickness of between 5 and 100 micrometers;
a flexible antenna comprising between 10 and 15 substantially concentric windings, the windings having progressively smaller sizes, and each winding being arranged on a first surface of the flexible substrate, the antenna having a transmission frequency of between 6.4 to 8.3 MHz, and wherein the antenna is configured to transmit energy to a penetration depth of at least 1 cm into the subject's body in a location of the subject's tongue; and
an adhesive disposed on at least one surface of the flexible substrate for adhering to skin of the subject.
2. The device of claim 1 , wherein the flexible antenna is configured to communicate with an implantable antenna configured to fit under skin in the area of the subject's chin, the implantable antenna having a maximum dimension of less than 18 mm.
3. The device of claim 1 , wherein the flexible antenna is included in a multi-layer structure, wherein each layer of the multi-layer structure includes at least one conductive trace associated with the flexible antenna.
4. The device of claim 3 , wherein the multi-layer structure includes two layers.
5. The device of claim 3 , wherein the multi-layer structure includes three or more layers.
6. The device of claim 1 , wherein the windings of the flexible antenna arranged on the first surface of the flexible substrate define at least a first elongated space between portions thereof; and the flexible antenna further comprises:
a plurality of substantially concentric and co-planar windings, the windings having progressively smaller sizes, arranged on a second surface of the flexible substrate and defining at least a second elongated space between portions thereof,
wherein the windings on the first surface of the substrate are at least partially offset from the windings on the second surface of the substrate such that portions of the windings on the first surface of the substrate overly the at least a second elongated space and wherein portions of the windings on the second surface of the substrate underlay the at least a first elongated space.
7. The device of claim 6 , wherein the first conductive trace and the second conductive trace are electrically connected via a trace extending through the flexible carrier.
8. The device of claim 6 , wherein the first conductive trace includes first windings and at least some of the first windings are connected to one another by first electrical trace steps, and wherein the second conductive trace includes second windings and at least some of the second windings are connected to one another by second electrical trace steps, wherein one or more of the first electrical trace steps cross one or more of the second trace steps at a non-zero angle.
9. The device of claim 6 , wherein substantially all of the first conductive trace overlies the at least a second elongated space and wherein substantially all of the second conductive trace underlays the at least a first elongated space.
10. The device of claim 1 , wherein the windings of the flexible antenna include heights of between 10 microns to 500 microns.
11. The device of claim 1 , wherein the windings of the flexible antenna include widths of between 10 microns to 500 microns.
12. The device of claim 1 , wherein the windings of the flexible antenna include heights of between 30 microns to 70 microns.
13. The device of claim 1 , wherein the windings of the flexible antenna include widths of between 30 microns to 70 microns.
14. The device of claim 1 , wherein distances between the windings are between 0.3 mm to 0.7 mm.
15. The device of claim 1 , wherein distances between the windings are between 0.01 mm to 1.0 mm.
16. The device of claim 1 , wherein the windings have diameters of between 0.01 mm to 2 mm.
17. The device of claim 1 , wherein the flexible substrate is included within a patch sized to lie substantially within an area bounded by opposing mandibular angles and a mental tubercle of the subject.
18. The device of claim 1 , wherein the adhesive includes at least one of: (i) biocompatible glues, (ii) starches, (iii) elastomers, (iv) thermoplastics, (v) emulsions.