Patent ID: 11873806
Assignee: ALCON INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  A | IPC A  F

Claim 0:
1. A cassette for a peristaltic pump of an ophthalmic surgical system, the cassette comprising:
a cassette body having a front surface and a back surface, wherein the front surface of the cassette body comprises a cassette body fluid path, wherein the cassette body fluid path comprises a plurality of ports, a cassette body fluid path active region, and a cassette body fluid path transition region between one of the ports and the cassette body fluid path active region, wherein the cassette body fluid path transition region comprises a cassette body fluid path transition channel that is recessed with respect to the cassette body fluid path active region; and
a flexible sheet joined to the cassette body, wherein the flexible sheet comprises a sheet pump segment with a back surface comprising a sheet fluid path and a front surface comprising a roller engagement surface, wherein when the flexible sheet is joined to the cassette body, the sheet fluid path is connected with the cassette body fluid path to form a pump fluid path, wherein the sheet pump segment comprises a sheet pump segment active region positioned over the cassette body fluid path active region and a sheet pump segment transition region positioned over the cassette body fluid path transition region;
wherein the sheet pump segment transition region comprises at least one ridge on the front surface of the sheet pump segment that has a maximum height at a position that is offset from a center line of the cassette body fluid path transition channel;
wherein the sheet pump segment transition region comprises two ridges on the front surface of the sheet pump segment, each of which has a maximum height at a position that is offset from the center line of the cassette body fluid path transition channel;
wherein the sheet pump segment transition region comprises an indentation at a position over the center line of the cassette body fluid path transition channel;
wherein the sheet pump segment transition region comprises two ridges on the front surface of the sheet pump segment, each of which has a maximum height at a position that is offset from the center line of the cassette body fluid path transition channel;
wherein one of the two ridges is on one side of the indentation, and the other of the two ridges is on an opposite side of the indentation;
wherein the two ridges of the sheet pump segment transition region merge into a single ridge in the sheet pump segment active region.