System and method for optogenetic therapy
Configurations are described for utilizing light-activated proteins within cell membranes and subcellular regions to assist with medical treatment paradigms, such as hypertension treatment via anatomically specific and temporally precise modulation of renal plexus activity. The invention provides for proteins, nucleic acids, vectors and methods for genetically targeted expression of light-sensitive proteins to specific cells or defined cell populations. In particular the invention provides systems, devices, and methods for millisecond-timescale temporal control of certain cell activities using moderate light intensities, such as the generation or inhibition of electrical spikes in nerve cells and other excitable cells.
1. A system for injecting a targeted tissue structure, comprising: an elongate flexible injection member biased to assume an arcuate geometric configuration when unloaded, the injection member comprising a matrix of injection needles and being configured to assume a substantially straight geometric configuration based upon a remote manipulation input from an operator, wherein the unloaded arcuate geometry is configured to approximate an arcuate outer surface of the targeted tissue structure; and an elongate delivery conduit defining a lumen through which the elongate flexible injection member is configured to be movably coupled.
2. The system of claim 1 , wherein the arcuate configuration comprises a substantially constant radius of curvature.
3. The system of claim 1 , wherein the arcuate configuration comprises an irregularly arcuate geometric configuration.
4. The system of claim 1 , wherein the elongate flexible injection member comprises a bending spine member configured to urge the elongate flexible injection member into the arcuate configuration when unloaded.
5. The system of claim 4 , wherein the bending spine member comprises a shape-memory superalloy.
6. The system of claim 4 , wherein the elongate flexible injection member further comprises a mechanical straightening bladder configured to be pressurized based upon the input from the operator to overcome loads applied by the bending spine member and urge the elongate flexible injection member into the substantially straight geometric configuration.
7. The system of claim 6 , wherein the injection member is operatively coupled to a straightening pressure reservoir configured to be pressurized by the operator, the straightening pressure reservoir fluidly coupled to the mechanical straightening bladder by a fluid conduit.
8. The system of claim 1 , wherein the elongate flexible injection member has a substantially rectangular form when viewed in the substantially straight configuration.
9. The system of claim 1 , wherein the arcuate geometric configuration comprises a circular shape.
10. The system of claim 1 , further comprising an injection fluid reservoir fluidly coupled to the matrix of injection needles.
11. The system of claim 1 , wherein the matrix of injection needles is substantially coplanar when the elongate flexible injection member is in the substantially straight configuration.
12. The system of claim 1 , wherein the elongate delivery conduit comprises a catheter.
13. The system of claim 12 , wherein the catheter is a remotely steerable catheter.
14. The system of claim 1 , further comprising an elongate delivery member coupled to the delivery conduit and configured to facilitate creation of relative motion between the elongate flexible injection member and the elongate delivery conduit during placement of the elongate flexible injection member.
15. The system of claim 14 , wherein the elongate delivery member comprises a flexible shaft configured to bend in compliance with bending of the elongate delivery conduit.