The development of vascular anastomosis was gradual, pragmatic and monumental. Early experiments proved arteries could be joined; consistent success followed when Alexis Carrel introduced triangulation and strict intima-to-intima apposition in the early 1900s [1]. Heparin was discovered in 1916 and later used in surgery. Control of clotting made longer and finer work safer [1]. Mid-century tools then lifted precision again: swaged atraumatic needles, monofilament sutures, loupes, and microscopes [1,2]. In 1960, microvascular anastomosis techniques showed that very small vessels could be repaired with reliability, which opened doors in limb salvage, replantation, and transplantation [1,2]. Adjuncts such as sealers and couplers were introduced to save time and protect the endothelium. Core principles emerged and stayed stable: gentle handling, accurate geometry, clear field, thorough flushing [1,2]. The aim of this presentation is to establish a historical context for the core principles of vascular anastomosis. Each technical change can be linked to practical gains across various surgical domains - distal bypasses that remain patent, replantations that survive, organ transplants that function. References 1. Shaikh N, Gopinath K, Nguyen D, et al. The history and innovations of blood vessel anastomosis. Bioengineering (Basel). 2022;9(2):75. 2. Moritz W. The History of Blood Vessel Anastomosis. Encyclopedia (MDPI). 2022. Available from: https://encyclopedia.pub/entry/20568