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Endoscopic ultrasonic aspirators

  • US 4,750,902 A
  • Filed: 05/19/1986
  • Issued: 06/14/1988
  • Est. Priority Date: 08/28/1985
  • Status: Expired due to Term
First Claim
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1. 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 comprisinghigh-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, andmeans 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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