Uncontrollable hemorrhage from deep, narrow wounds poses a critical threat to life, as locating the bleeding arteries in such areas is challenging. Rapid bleeding control remains a significant challenge in pre-hospital care. Herein, an injectable hemostatic device filled with disc-like PVA sponges is developed for this objective. The pristine PVA sponge is strung as a necklace-structured sponge loaded in a foldable injector. With a novel retraction mechanism, this self-designed injector precisely deploys hemostatic sponges to deep bleeding sites, surpassing the XStat