An ultrasonic medical instrument having a handpiece and medical ultrasonicblade assembly including a vibration antinode, a handpiece, and a medical ultrasonicblade. The blade is threadably engaged by the handpiece proximate the vibrationantinode. The blade is in ultrasound-transmitting physical contact with thehandpiece proximate the vibration antinode and apart from where the medicalultrasonic blade is threadably engaged by the handpiece. A medical-instrumentconnection assembly for transmitting ultrasonic vibrations includes first,second, and third connecting members. The first connecting member is adaptedto be ultrasonically vibrated and has a longitudinal axis. The second connectingmember is capable of being positioned to be substantially coaxially alignedwith the longitudinal axis and in ultrasound-transmitting physical contactwith the first connecting member. The third connecting member surrounds, andis rotatably or fixedly attached to, the second connecting member and is threadablyengageable with the first connecting member.
