An instrument in the form of a needle with multiple sharp prongs intended to be used in conjunction with a syringe to administer a multiple-site injection into the submucosal layer of tissue, typically of anatomical structures with lumens. It includes a retractable proximal handle to manually deploy and position the needle in the target tissue, and is often used to inject substances (e.g., cell therapy preparations) into urethral tissues [e.g., mid-urethral tissue, external urethral sphincter], typically for treating female stress urinary incontinence (SUI). This is a single-use device.