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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0865240 (1986-05-19) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 584 인용 특허 : 0 |
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.
An apparatus for removal of unwanted biological material comprising: a handpiece; an elongated sheath extending from the handpiece and having a hollow bore therethrough; high frequency vibration means comprising high-frequency vibration source means mounted in the handpiece for generating a first am
An apparatus for removal of unwanted biological material comprising: a handpiece; an elongated sheath extending from the handpiece and having a hollow bore therethrough; high frequency vibration means comprising high-frequency vibration source means mounted in the handpiece for generating a first amplitude, first velocity transformer means located in the hollow bore within the sheath and spaced therefrom, having an input end and an output end, the input end being coupled to the vibration source to be vibrated thereby, and the output end vibrating in response to such received vibrations with a second amplitude greater than such first amplitude, second velocity transformer means having an input end and an output end, the input end being coupled to the output end of the first transformer to be vibrated thereby, and the output end vibrating in response to such received vibrations with a third amplitude greater than such second amplitude, said third amplitude being sufficient to disintegrate such unwanted biological material, said second velocity transformer means having working tip means extending beyond the end of the sheath away from the handpiece for contacting said unwanted biological material; said working tip means having a smaller cross-sectional area than that of said second velocity transformer means, the second transformer means when vibrating, having a substantially constant mechanical stress level in substantially all of its length; the output end of the first transformer velocity means and the second velocity transformer means forming a unitary component to minimize the production of transverse flexural vibrations; said high-frequency vibration source means and said first and second velocity transformer means being elongated and having a continuous hollow bore extending along a common longitudinal axis thereof, thereby forming first fluid passage means in a space defined between the first and second velocity transformer means and the sheath, and second fluid passage means along said common longitudinal axis; means for introducing fluid into one of said fluid passage means to irrigate an operating site adjacent said working tip means of the second velocity transformer means where such unwanted biological material is contacted and disintegrated, and means for applying suction to the other of said fluid passage means to remove such fluid and such disintegrated unwanted biological material from such operating site.
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