Dabigatran ester is a new synthetic direct thrombin inhibitor. It is the precursor of dabigatran and belongs to non peptide thrombin inhibitor. After oral absorption through gastrointestinal tract, it is transformed into dabigatran with direct anticoagulant activity in vivo. Dabigatran binds to the fibrin specific binding site of thrombin and prevents the cleavage of fibrinogen into fibrin, thus blocking the final step of coagulation waterfall network and thrombosis. Dabigatran can dissociate from fibrin thrombin conjugate and play a reversible anticoagulant effect