Sumitomo Bakelite Company Limited

Sumitomo Bakelite Company Company Limited

Morito Idemoto

Yasuo Noguchi

Naohiko Inoue

Tadaaki Ikeda

Fumiaki Matsunaga

Kazuoki Miyazaki

A handpiece for preventing the visual field of an endoscope from being disturbed by irrigation liquid, and which performs safely and reliably selective separation of biological tissue such as a blood vessel or the like by ultrasonic vibration, in operation under a visual field of an endoscope which is restricted in operation has a tip section of 5/4 or 7/4 times wavelength, a forward end curved in an arcuate form, and a tip cover provided with a detachable tip top cover at a forward end, which is semi-transparent or transparent, and which has an inclined surface, to prevent irrigation liquid from scattering. The tip cover of an ultrasonic surgical knife is provided with an auxiliary cavity for a laser probe, and a spatula-like projection at the forward end of the cover. The main cavity and the auxiliary cavity for the tip are closed by an O-ring gas-tight packing or a gas-tight closure to prevent pneumoperitoneum gas within an abdomen cavity from leaking.

Handpiece for surgical operation

Surgical instrument

A surgical ultrasonic horn used in a surgical operation comprises a horn body and an end plate portion. Cutting portions are provided on an edge and an end of the end portion. A passage for irrigation solution extends in the horn body and the end plate portion. At least one bore opens at the cutting portions by a jet angle of 5.degree. to 90.degree. in respect of a plane of the end plate portion. The irrigation solution passage communicates with the bore, thereby the irrigation solution is sprayed therethrough.

Surgical ultrasonic horn

A surgical operation device comprising an ultrasonic piezoelectric transducer for generating ultrasonic vibrations, an oscillation feedback type oscillator for supplying high-frequency power to the ultrasonic transducer, a vibration transmitter connected to the ultrasonic transducer for transmitting and amplifying mechanical vibrations at an ultrasonic frequency, a suction unit and an irrigator. The ultrasonic transducer includes a bolted Langevin type transducer. The feedback circuit of the oscillation feedback type oscillator includes an oscillation voltage detector, a phase comparator, a low pass filter, a differential amplifier, and a voltage controlled oscillator. Thus, the mechanical resonant frequency can be traced in a wide range of fluctuations of a load on the vibration transmitter during vibration and vibrations can start an appropriate mechanical resonate frequency irrespective of the load status of the vibration transmitter at the start-up.

Operation device

Ultrasonic surgical apparatus

Excretions treating apparatus

A gas concentration measuring instrument using the dependency of the propagation velocity of ultrasonic wave propagating in gas on the gas concentration incorporates a dampproof ultrasonic sensor with a metal or the like deposited by evaporation on the surface of the sealing material. Therefore, this gas concentration measuring instrument is almost not affected by the change of temperature and humidity and can precisely measure gas concentration continuously for a long period of time under high humidity. The ultrasonic sensor is formed fundamentally by an ultrasonic vibrator, a holder and a sealing material. More preferably, this sensor is embedded in a block and sealed with an elastic sealing material and a film of conductive material and/or a nonconductive material is formed on the surface of the sealing material, the elastic sealing material, the vibrating end surface of the ultrasonic sensor and the end surface of the block.

Growing community of inventors

Yokohama, Japan

Morito Idemoto