Microcannula Actuation for Precise Viscous Fluid Delivery

The device employs a nested structure where an inner catheter is positioned within an outer needle assembly. The inner catheter can be advanced or retracted relative to the outer needle, allowing controlled fluid delivery through the small bore while maintaining a manageable external structure. This nesting approach enables precise fluid delivery through the microcannula without requiring the entire injection mechanism to be equally complex.

The device incorporates a self-adjusting mechanism where the inner catheter automatically positions itself relative to the outer needle based on fluid pressure and flow characteristics. This self-service feature reduces the manual adjustment required by the operator, making the precise delivery through the small bore needle easier to operate while maintaining high precision.

The device applies local quality by concentrating the fluid delivery at the precise location where it is needed within the eye, rather than diffuse injection. The small bore needle delivers viscous fluid directly to the target area, maintaining intraocular space locally while minimizing disruption to surrounding tissues including the corneal endothelium. This localized approach reduces mechanical damage compared to broader injection methods.

The device employs dynamic control where the inner catheter can be moved relative to the outer needle during the injection process. This dynamic adjustment allows the operator to control the rate and amount of viscous fluid delivered to dilate tissue spaces such as Schlemm's canal during glaucoma surgery. The movable catheter provides real-time control over fluid delivery, preventing uncontrolled injection while maintaining surgical effectiveness.