Controlled vacuum in ophthalmic retinal surgery
First Claim
1. A surgical cassette having two interconnected chambers, a first chamber having a volume of at least about 25 cc connected through a controlled vacuum conduit means to a second chamber having a volume at least about four times that of the first chamber, the chambers also being interconnected by a controlled orifice such that when the chambers are simultaneously under vacuum from a single vacuum source, the level of vacuum in the second chamber is at least 40 mm Hg absolute greater than in the first chamber thereby assisting the passage of aspirant through the controlled orifice from the first chamber to the second larger chamber substantially without interruption of the vacuum level in the first chamber.
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Accused Products
Abstract
The invention relates to a cassette 12 and vacuum aspiration collection system 10 for ophthalmic surgery. The cassette 12 comprises two parts 14, 16 under vacuum where the smaller part 14 discharges into the larger part 16 and the vacuum provided to both parts is provided by a single unit 30. The vacuum control system 10 has improved response to the user'"'"'s demand.
36 Citations
18 Claims
- 1. A surgical cassette having two interconnected chambers, a first chamber having a volume of at least about 25 cc connected through a controlled vacuum conduit means to a second chamber having a volume at least about four times that of the first chamber, the chambers also being interconnected by a controlled orifice such that when the chambers are simultaneously under vacuum from a single vacuum source, the level of vacuum in the second chamber is at least 40 mm Hg absolute greater than in the first chamber thereby assisting the passage of aspirant through the controlled orifice from the first chamber to the second larger chamber substantially without interruption of the vacuum level in the first chamber.
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8. An apparatus having a surgical cassette in combination with a vacuum source comprising:
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(a) a surgical cassette with a first chamber having a first volume, and 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 chambers being interconnected by a controlled orifice; (b) the vacuum source being 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 (c) conduit 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 (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification