An Enhanced Hemostatic Ultrasonic Scalpel Based on the Longitudinal-Torsional Vibration Mode

This paper proposes an ultrasonic scalpel based on the longitudinal-torsional vibration mode to enhance hemostatic ability. The concentrator of proposed has been specially designed with spiral grooves realize this mode. change working enlarged vertical motion component distal blade efficiently radiate energy into dissected tissues, supporting that blood vessel can receive sufficient be sealed. electromechanical equivalent method employed in initial design obtain desired resonance frequency. structural optimization finite element (FEM) conducted further improve design, as well investigation its dynamic performances. Both conventional and presented prototypes were fabricated, their important parameters such as, mechanical quality factor frequency, tested compared using impedance analyzer. ex-vivo experiments have measure temperature distribution investigate transferring heat effects. corresponding results indicated internal values tissues cut hemostatic-enhanced are 24.0% higher 3mm layer, 16.5% 6mm 8.5% 9mm respectively. sealing capacity scalpels investigated through coagulation dissection experiment chicken carotid burst pressure tests. average sealed vessels by achieve than scalpel.