ULTRASONIC BLADE AND CLAMP ARM MATCHING DESIGN

An ultrasonic surgical instrument includes a shaft assembly and an end effector. The end effector extends extending distally from the shaft assembly and includes an ultrasonic blade, a clamp arm, and a clamp pad. The clamp arm is movably secured relative to the ultrasonic blade and includes a mortise longitudinally extending therethrough. The clamp pad is connected to the clamp arm. The clamp arm includes a pad body and a tenon. The pad body extends in a longitudinal direction and is configured to compress a tissue toward the ultrasonic blade. The tenon is secured to the pad body and is received within the mortise. The tenon includes a rail, a support base, and a plurality of openings. The plurality of openings extends through at least one of the support base or the rail such that the tenon has a predetermined transverse spring rate longitudinally along the tenon.