| 摘要 |
A device for quantitative determination of impurities, especially bacteria, on a flat surface including a body member provided with a centrally located cylindrical rinsing chamber and an annular suction chamber surrounding the rinsing chamber, whereby the suction chamber generates a subpressure therein to press the rinsing chamber against the flat surface being investigated. The rinsing chamber has an opening adapted to be placed on the flat surface, and at least one aperture, preferably two apertures, spaced from the opening for connecting the rinsing chamber with the outside atmosphere for permitting both liquid passage and air passage from outside the body member into the rinsing chamber and vice versa. An outer sealing edge is provided around the suction chamber and an inner sealing edge is disposed on a common wall between the rinsing chamber and the sealing chamber for providing a liquid-tight and an air-tight seal therebetween to maintain the subpressure within the suction chamber. An edge portion of the body member overlaps the suction chamber and tapers from a thick cross section to a thin cross section in a direction towards the outer sealing edge for flexibility thereof. Preferably, the body member is a one piece construction which is fabricated from a flexible material, preferably rubber. One of the apertures is adapted to receive a liquid conveying arrangement such as a suction siphon, insertable therein for the liquid passage thereof into and out of the rinsing chamber.
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