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Herein, a micro\u20103\u2010degree of freedom (DOF) force sensor with a length of only 3.8\u2009mm that can adjust the puncture angle during retinal vein cannulation (RVC) is proposed. Taking advantage of 3D printing technology, the optical fiber and injection line are embedded in the nitinol tube with flexible hinges to achieve integration of the force sensing and injection functions. A new fiber Bragg grating (FBG) configuration method and linear decoupling algorithm are also proposed herein. Static calibration experiments demonstrate excellent resolution of the force sensor, of less than 0.072\u2009mN for transverse force and 0.738\u2009mN for the axial force in the range from \u221220 to 20\u2009mN. The proposed sensor is installed on a newly developed actuator, and an ex\u2009vivo experiment is performed on pig cadaver eyes. 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