Injection device for subretinal delivery of therapeutic agent

An apparatus, comprising:

• (a) an injector assembly, wherein the injector assembly comprises:
• (i) a body,
• (ii) a flexible cannula extending distally from the body, wherein the flexible cannula is sized to be inserted through an incision in an eye of a patient, and
• (iii) a needle slidably disposed in the flexible cannula;
• (b) an injector driver, wherein the injector driver is operable to drive the needle longitudinally relative to the flexible cannula;
• (c) a fluid source assembly in fluid communication with the needle;
• and
• (d) a magnetic pad assembly, wherein the magnetic pad assembly is sized and configured to be placed on a forehead of the patient, and the magnetic pad assembly includes an adhesive;
• wherein the body of the injector assembly is configured to be removably secured to the magnetic pad assembly;
• wherein the injector assembly further comprises a magnet, wherein the magnet is configured to removably secure the body to the magnetic pad assembly via magnetic attraction, where the magnet is held in a stationary position relative to the body;
• wherein the injector driver is operable to drive the needle longitudinally relative to the magnet.