Systems, methods and devices for a skull/brain interface
Methods, devices, and systems induce neuromodulation by focusing a source of stimulation through a skull/brain interface in the form of an aperture formed in the skull, a naturally occurring fenestration in the skull, or a transcranial channel. Methods, devices, and systems identify where to locate skull/brain interfaces, accessories that can be used with the interfaces, and features for controlling stimulation delivered through the interfaces. Multiple indications for the skull/brain interfaces include diagnosis and treatment of neurological disorders and conditions such as epilepsy, movement disorders, depression, Alzheimer's disease, autism, coma, and pain.
1. A system for facilitating the delivery of a form of neuromodulation to, or the detecting of signals from, one or more target regions of a subject's brain, the system comprising:
a transcranial channel configured for transcranial implant to extend between an outer layer of a skull and an inner layer of the skull, and having a transcranial inner lumen adapted to conduct an ionic current to or from a first target region interior of the skull; and
a transparenchymal channel configured for brain implant entirely beneath the outer layer of the skull and to be associated with the transcranial channel, the transparenchymal channel having a transparenchymal inner lumen adapted to conduct the ionic current to or from a second target region interior of the brain,
wherein the transparenchymal channel is formed of a soft, flexible material and comprises:
a transparenchymal channel proximal end designed to be implanted at least partially in an epidural space of the subject's brain between an inner layer of the skull and the dura matter;
a transparenchymal channel distal end designed to be oriented towards the second target region;
a wall extending between the transparenchymal channel proximal end and the transparenchymal channel distal end and defining the transparenchymal inner lumen; and
a collector at the transparenchymal channel proximal end, wherein the collector is configured for implant beneath the inner layer of the skull and defines a proximal portion of the transparenchymal inner lumen having a diameter greater than the diameter of the portion of the transparenchymal inner lumen distal the proximal portion.
2. The system of claim 1 , wherein the transcranial channel comprises:
a transcranial channel proximal end designed to be oriented towards the outer layer of the skull;
a transcranial channel distal end designed to be oriented towards the first target region; and
an inner wall extending between the transcranial channel proximal end and the transcranial channel distal end and defining the transcranial inner lumen.
3. The system of claim 2 , wherein the inner wall is formed of an ion permeable material.
4. The system of claim 3 wherein the transcranial channel further comprises an outer wall formed of a material that is not ion permeable.
5. The system of claim 2 , wherein the transcranial inner lumen is configured to be filled with an ion-permeable substance.
6. The system of claim 1 , wherein at least a portion of the soft, flexible material is ion permeable.
7. The system of claim 1 , further comprising one or more stiffening elements located in or around the transparenchymal inner lumen, wherein the stiffening elements are configured to maintain the patency of the transparenchymal inner lumen without compromising the flexibility of the transparenchymal channel.
8. The system of claim 1 , wherein the transparenchymal inner lumen is configured to be filled with an ion-permeable substance.
9. The system of claim 1 , wherein the transparenchymal inner lumen is configured to receive a stylet.
10. The system of claim 1 , wherein the transparenchymal channel further comprises a second lumen independent of and extending generally parallel to the transparenchymal inner lumen, the second lumen configured to receive a stylet.
11. The system of claim 1 , wherein at least one portion of the transparenchymal channel is designed to contact the second target region.
12. The system of claim 1 , wherein the transparenchymal channel is associated with the transcranial channel by a physical connection such that the transcranial inner lumen and the transparenchymal inner lumen form a continuous conduit.
13. The system of claim 1 , wherein the transcranial inner lumen and the transparenchymal inner lumen form a conduit adapted to facilitate transmission of an ionic current from the brain resulting from electrical activity of the brain.
14. The system of claim 1 , wherein the transcranial inner lumen and the transparenchymal inner lumen form a conduit adapted to transmit charged particles of a biologically-active agent into the intracranial space.
15. The system of claim 14 , wherein the biologically-active agent is selected from the group consisting of: glutamate, acetylcholine, valproate, aspartate, gamma amino butyrate, adrenocorticotropic hormone, cortisol, beta endorphin, and serotonin.
16. A system for facilitating the delivery of a form of neuromodulation to, or the detecting of signals from, one or more target regions of a subject's brain, the system comprising:
a transcranial channel configured for transcranial implant to extend between an outer layer of a skull and an inner layer of the skull, and having a transcranial inner lumen adapted to conduct an ionic current to or from a first target region interior of the skull; and
a transparenchymal channel configured for brain implant entirely beneath the outer layer of the skull and to be associated with the transcranial channel, the transparenchymal channel having a transparenchymal inner lumen adapted to conduct the ionic current to or from a second target region interior of the brain,
wherein the transparenchymal channel is associated with the transcranial channel by a physical alignment between the transcranial inner lumen and the transparenchymal inner lumen such that the transcranial inner lumen and the transparenchymal inner lumen form a discontinuous conduit.