A waveguide configured for use with an ultrasonic instrument includes a horn which engages an ultrasonic transducer to receive ultrasonic energy. A body distally extends from the horn in order to receive ultrasonic energy from the horn. A blade is fixedly engaged to a distal end of the body, and distally extends from the distal end of the body in order to receive ultrasonic energy from the body for treating tissue in contact with the blade. A bi-stable spring-latch connector releasably couples, under compression, the horn and the body, or the body and the blade.