초록 ▼

A method and apparatus for endoscopic removal of compliant biological tissues utilizing an endoscopic ultrasonic aspirator comprising irrigation and aspiration means, a piezoelectric ultrasonic transducer, a first resonator such as a half-wave stepped velocity transformer, a probe including a second

A method and apparatus for endoscopic removal of compliant biological tissues utilizing an endoscopic ultrasonic aspirator comprising irrigation and aspiration means, a piezoelectric ultrasonic transducer, a first resonator such as a half-wave stepped velocity transformer, a probe including a second resonator such as a constant-stress velocity transformer, a blunt or modified working tip of open channel means or restricted tubular means for application of ultrasonic energy to cellular material, and a capacitive fluid sensor to detect the presence of irrigation fluid adjacent these transformers within the instrument. The surgery is advantageously performed by operating the transducer in the 10-20 kHz range to achieve maximum cavitation of the intracellular fluids in the tissues to be removed.

대표청구항 ▼

A method of removing cellular material from a compliant tissue relatively deep within a biological body through a narrow orifice comprising: providing an elongated surgical instrument which comprises an elongated working end having a length of at least about 8 cm, a circumference of no more than abo

A method of removing cellular material from a compliant tissue relatively deep within a biological body through a narrow orifice comprising: providing an elongated surgical instrument which comprises an elongated working end having a length of at least about 8 cm, a circumference of no more than about 29 mm, and a working tip at the forward end thereof, said instrument including means for viewing said working tip and said material to be removed; inserting said forward end of said elongated surgical instrument into the orifice with said working tip located close to the material to be removed; and vibrating said working tip longitudinally at a frequency of about 10-20 kHz so as to cavitate the intracellular fluids in such material to destroy the cells thereof while monitoring the removal of said material through the viewing means of said instrument.