Ultrasonic transducer for surgical instrument

An ultrasonic medical device comprising:

• a surgical tool comprising a transducer mounting portion at a proximal end, an end effector at a distal end, and a waveguide disposed therebetween, the waveguide extending along a longitudinal axis, the transducer mounting portion of the surgical tool comprising a first face and a second face at the proximal end, the second face positioned opposite the first face;
• a first transducer comprising a body defining a face;
• a second transducer comprising a body defining a face;
• a housing comprising a first retainer and a second retainer, wherein at least a portion of the surgical tool is disposed within the housing, wherein the housing comprises a pair of electrical contacts, wherein a first electrical contact of the pair of electrical contacts is configured to contact an electrically conductive portion of the first transducer and a second electrical contact of the pair of electrical contacts is configured to contact an electrically conductive portion of the second transducer;
• a first flange;
• and
• a second flange, wherein the first flange extends from a first side of the surgical tool and the second flange extends from an opposing side of the surgical tool;
• and wherein:
• each of the first flange and the second flange is symmetrically disposed about a node location in the surgical tool;
• the first retainer is configured to receive the first flange and the second retainer is configured to receive the second flange;
• the face of the first transducer is in mechanical communication with the first face of the surgical tool and the face of the second transducer is in mechanical communication with the second face of the surgical tool opposite the first transducer;
• the first transducer and the second transducer are configured to operate in a D31 mode with respect to the longitudinal axis of the waveguide;
• upon activation by an electrical signal having a predetermined frequency component, the first and second transducers are configured to induce a standing wave in the surgical tool to cause the end effector to vibrate, the standing wave having a wavelength proportional to the predetermined frequency component of the electrical signal;
• and
• the surgical tool defines nodes and antinodes corresponding to nodes and antinodes of the induced standing wave, wherein the nodes correspond to locations of minimal displacement and the antinodes correspond to locations of maximum displacement.