Anatomically compliant antenna for implantable medical device
A flexible antenna is associated with an active implantable medical device to facilitate communication between the implantable medical device and an external component in the outside world via, for example, long range or far field telemetry. The flexibility of the antenna allows it to conform to the shape of the location at which it is situated, such as on the cranial bone of a patient for an antenna associated with a cranially implanted medical device. The conformability of the antenna helps to maintain the antenna in the desired shape and to maintain it in the desired location relative to implantable medical device and the patient and improves patient comfort.
1. An implantable medical device configured to be implanted in a patient, comprising:
a housing configured for placement in a hole formed in a cranium of the patient; and
an antenna positioned relative to the housing such that: 1) a side edge of the antenna is adjacent to and extends substantially parallel to and along an edge of the housing, and 2) upon placement of the housing in the hole, the antenna is positioned outside of the hole, adjacent a surface of the cranium,
wherein the antenna is configured so that at implant of the implantable medical device in the patient, the antenna is capable of being bent to conform to an anatomical contour of the patient and, upon being bent, is capable of retaining a bent shape.
2. The implantable medical device of claim 1 , further comprising a strain relief configured to be connected to the housing and to encase the antenna.
3. The implantable medical device of claim 2 , wherein the strain relief comprises a hollow interior portion within which the antenna is encased.
4. The implantable medical device of claim 2 , wherein the strain relief is formed of a material and the antenna is fully encased in the material.
5. The implantable medical device of claim 2 , wherein the strain relief is configured to support leads extending from the housing.
6. The implantable medical device of claim 2 , wherein the strain relief is formed from a flexible elastomer material.
7. The implantable medical device of claim 1 , wherein the antenna comprises a length of flexible metal shaped into a plurality of turns that form a geometric configuration.
8. The implantable medical device of claim 7 , wherein the length of flexible metal shaped into a plurality of turns is configured to be bent from a first shape of the geometric configuration that is substantially flat, to a second shape of the geometric configuration that is curved, wherein the second shape corresponds to the bent shape.
9. The implantable medical device of claim 8 , wherein the geometric configuration is rectangular.
10. The implantable medical device of claim 9 , wherein the plurality of turns of the length of flexible metal form a rectangular spiral.
11. The implantable medical device of claim 9 , wherein the plurality of turns of the length of flexible metal form a series of interconnected rectangular curves.
12. The implantable medical device of claim 1 , further comprising a lead connector structure having connector ports configured to connect with at least one lead, and wherein the antenna is structurally independent of the lead connector structure.