Therapeutic agent delivery device with convergent lumen

An apparatus, comprising:

• (a) a body;
• (b) an outer cannula extending distally from the body along a longitudinal axis, wherein the outer cannula is fixedly secured to the body;
• (c) an inner cannula extending along the longitudinal axis and slidably disposed in the outer cannula for translating longitudinally relative to the outer cannula, wherein the inner cannula includes:
• (i) an open proximal end,
• (ii) an open distal end configured to pierce a retina of an eye of a patient, and
• (iii) a lumen extending between the open proximal end and the open distal end, wherein the lumen is configured to communicate first and second fluids to the open distal end for delivering the first and second fluids into a subretinal region of the eye;
• (d) a first supply conduit configured to supply the first fluid to the lumen of the inner cannula, wherein the first supply conduit includes a first distal conduit end fixedly secured relative to the inner cannula such that the first distal conduit end is configured to translate longitudinally together with the inner cannula relative to the outer cannula;
• and
• (e) a second supply conduit configured to supply the second fluid to the lumen of the inner cannula, wherein the second supply conduit includes a second distal conduit end fixedly secured relative to the inner cannula such that the second distal conduit end is configured to translate longitudinally together with the inner cannula relative to the outer cannula.