ULTRASONIC OSCILLATION SYSTEM APPLIED IN PLASTIC SURGERY Russian patent published in 2004 - IPC

FIELD: medical engineering.

SUBSTANCE: device has piezoelectric transducer enclosed in casing as back frequency-reducing resonant cover, ring-shaped piezoelectric members and frequency-reducing concentrating cover arranged in series on connective rod and acoustically linked to each other. Revolution body generatrix of the piezoelectric transducer is continuous piecewise smooth curve. The revolution body has the first and the second cylindrical portions joined by an area of smooth transition. Central through canal is available in connection rod and concentrating cover connected and acoustically linked to the piezoelectric transducer. Ultrasonic surgical instrument is manufactured as hollow rod having the first and the second cylindrical portions joined by an area of smooth transition. Hollow working tip having rounded edges is available on rod end. The piezoelectric members are arranged on the first cylindrical segment in the area where oscillation amplitude is not less than 30% of maximum reached on resonant cover back side. Two canals for supplying irrigation liquid are arranged symmetrically relative to the central canal in tie rod and concentrating cover. The canals are connected to inlet tube with one end and the other end having exit to concentrating overlay surface in the smooth transition segment of the piezoelectric transducer. The second cylindrical segment length is selected so that total length of the surgical instrument is equal to 0.55 or 1.1 or 1.65 or 2.2 times ultrasonic oscillation wavelength at the smooth transition part. The working end is shaped as truncated cone having internal conic or spherical recess which bell mouth allows ultrasonic radiation propagation to be directed along acoustic axis.

EFFECT: enhanced effectiveness in converting electric oscillations into ultrasonic ones; optimum coordination of transducer and surgical instrument operation; increased emitting surface without changes in working end cross-section area.

2 dwg