Medical machine for performing surgery and treating using ultrasonic energy
Device for diagnostic and therapeutic intravascular intervention
Dark field coaxial ultrasonic transducer
Doppler tip wire guide
Method of fabricating dark field coaxial ultrasonic transducer
Device for removing plaque from arteries
Method and apparatus for ultrasonic surgical fragmentation and removal of tissue
ApplicationNo. 625919 filed on 12/10/1990
US Classes:606/128, With fragmenting means604/22With means for cutting, scarifying, or vibrating (e.g., ultrasonic, etc.) tissue
ExaminersPrimary: Smith, Ruth S.
Attorney, Agent or Firm
Foreign Patent References
International ClassA61B 017/00
AbstractUltrasonic apparatus for clot dissolution and plaque ablation includes a radiator for coupling ultrasonic waves into plaque and a piezoelectric crystal, connected with said radiator, for the intravascular generation of ultrasonic waves; said ultrasonic waves being propagated along a longitudinal axis of said piezoelectric crystal and having an inertial node position within said piezoelectric crystal. The piezoelectric crystal is constructed in order to prevent significant power loss caused by a shifting of the inertial node of the generated ultrasonic waves to a position exterior to said piezoelectric crystal due to loading of the radiator caused by the coupling of ultrasonic waves into the clot or plaque.