Intratympanic injector devices and needles for delivery of drugs and methods of use

1. A system for delivering one or more therapeutics to a region of an ear, the region being internal to a tympanic membrane, the system comprising:

a canal guide configured to be inserted within and fittingly engaged with walls of an ear canal, the canal guide comprising:

a viewing lumen extending between a proximal end of the canal guide to a distal-most end of the canal guide, the distal-most end of the canal guide sized to remain external to the tympanic membrane; and

a guide lumen extending from a proximal opening near the proximal end of the canal guide to a distal opening near the distal-most end of the canal guide, wherein the guide lumen curves from a first axis to a second axis, the first axis extending through the proximal opening and the second axis extending through the distal opening;

a housing having a handle portion extending downwardly away from the canal guide, wherein the guide lumen of the canal guide is eccentric relative to a longitudinal axis of the canal guide, wherein the canal guide is adjustably attached to the housing such that the position of the guide lumen relative to the housing is adjusted by rotation, and wherein the guide lumen of the canal guide is adjustable around the longitudinal axis as the canal guide is rotated; and

a needle assembly comprising a flexible shaft sized to extend through the guide lumen of the canal guide, the flexible shaft defining a fluid delivery lumen,

wherein the canal guide provides alignment of the needle assembly within the ear canal relative to the tympanic membrane.

2. The system of claim 1 , wherein the flexible shaft comprises a sharpened tip configured to penetrate the tympanic membrane.

3. The system of claim 1 , wherein the distal opening from the guide lumen is positioned eccentric to a longitudinal axis of the canal guide.

4. The system of claim 1 , wherein the longitudinal axis of the canal guide extends through the viewing lumen of the canal guide.

5. The system of claim 1 , wherein the handle portion extends downwardly in a transverse direction relative to the central longitudinal axis of the canal guide and away from the canal guide such that the handle portion extends to a position rearwardly of the proximal opening of the guide lumen.

6. The system of claim 5 , wherein the proximal opening of the guide lumen defines a receiving inlet that is larger than an inner diameter of the guide lumen and that is configured to receive the needle assembly.

7. The system of claim 6 , wherein the inner diameter of the guide lumen is about 0.17 mm to about 1.00 mm and an interior diameter of the viewing lumen is larger than the inner diameter of the inner diameter of the guide lumen.

8. The system of claim 7 , wherein the needle assembly includes a proximal coupler, a distal sharp tip, and the flexible shaft extending from the proximal coupler to the distal sharp tip, wherein the proximal coupler is larger than the receiving inlet of the guide lumen.

9. The system of claim 8 , wherein the proximal coupler of the needle assembly is sized to remain external to the canal guide and the tympanic membrane while the distal sharp tip of the needle assembly is movable relative to the distal opening of the guide lumen to penetrate through the tympanic membrane for advancement into the middle ear.

10. The system of claim 9 , wherein the proximal coupler of the needle assembly is matable with syringe having a plunger actuator for injection of a therapeutic fluid through the needle assembly in the guide lumen and into a targeted ear site interior to the tympanic membrane.

11. The system of claim 10 , wherein the second axis of the distal opening of the guide lumen is parallel to and offset from the central longitudinal axis of the viewing lumen.

12. The system of claim 11 , further comprising a lens positioned at a proximal end of the viewing lumen.