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Controlled vacuum cassette in ophthalmic retinal surgery

  • US 5,584,824 A
  • Filed: 06/08/1994
  • Issued: 12/17/1996
  • Est. Priority Date: 06/08/1994
  • Status: Expired due to Fees
First Claim
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1. A surgical cassette and aspiration system comprising:

  • (a) a first chamber having a first volume;

    (b) a second chamber having a second volume, the volume of said second chamber being at least about four times that of the first chamber, the first chamber being contained within the second chamber, the chambers being interconnected by a controlled orifice;

    (c) a vacuum source connected to the second chamber to provide a vacuum of at least about 400 mm Hg gauge, the vacuum being maintained at a predetermined level; and

    (d) a vacuum means for applying the vacuum of the second chamber to the first chamber such that the vacuum of the first chamber quickly approaches the vacuum of the second chamber, the controlled orifice permitting passage of aspirant through the controlled orifice from the first chamber to the second chamber substantially without interruption of the vacuum level in the first chamber.

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