#$%^&*AU2007202847B220130627.pdf#####Re: 2698 US Express Mail IV 759785400 US SYSTEM AND METHOD OF NON-INVASIVE CONTINEOUS LEVEL SENSING ABSTRACT OF THE DISCLOSURE Embodiments of the present invention provide a system and method for detecting the level of a fluid in a surgical cassette by projecting light from a linear light source into a wall of a cassette. Depending on the amount a light reflected or refracted in the cassette (i.e., due to the cassette material/fluid interface or cassette material/air interface (or other interface)) various portions of a linear sensor array will be more or less illuminated. By examining the illumination of the linear sensor array, the level of fluid in the chamber can be determined.4/8 200I 216 2206 FIGURE 4
