Controlled vacuum cassette in ophthalmic retinal surgery
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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Abstract
The invention relates to a cassette and vacuum aspiration collection system for ophthalmic surgery. The cassette comprises two parts under vacuum where the smaller part discharges into the larger part and the vacuum provided to both parts is provided by a single unit. The vacuum control system has improved response to the user'"'"'s demand.
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Citations
11 Claims
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1. A surgical cassette and aspiration system comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification