Objective This project aims to develop a resorbable 3D-printed collagen venous anastomotic coupler with applicator for microvascular surgery. Introduction Venous anastomoses are a critical determinant of free flap success, with thrombosis and technical failure contributing significantly to flap loss. Current coupler devices are limited to venous couplers due to issues with material rigidity and permanent foreign body implantation. Biodegradable collagen offers a biologically integrated alternative. Method A biodegradable collagen coupler and dedicated applicator were designed and fabricated using high-resolution 3D printing. Devices were evaluated for mechanical strength, ease of deployment, luminal patency, and degradation characteristics. Bench-top microvascular models were used to assess anastomotic integrity. Results The collagen coupler demonstrated reliable deployment, maintained luminal patency, and provided sufficient tensile strength for venous anastomosis. Controlled degradation occurred without structural collapse. Handling characteristics were comparable to existing coupler systems. Conclusion This study demonstrates the feasibility of a 3D-printed collagen venous coupler as a biodegradable alternative to permanent devices. This platform may reduce long-term foreign body complications in microvascular surgery.