Abstract:
A particle analyzing apparatus (10) and method of moving and counting particles in suspension through such an apparatus. The particle analyzing apparatus comprises a particle counting device (16) wherein particles in suspension are caused to be moved through an aperture (24) whose effective impedance is changed with the passage of each particle therethrough and a fluid connection means (18) for drawing a quantity of the suspension through the aperture, including a source of vacuum (30). The source of vacuum comprises a bellows (60) having an end (64), and a constant force means (66) connected to the end of the bellows means.
Abstract:
Method and apparatus for detecting contaminants, including emboli, in a fluid sample prior to sample testing, wherein fluid density sensors are arranged on opposite sides of a fluid segmenting valve to provide electrical signals indicative of the degree of optical opacity of the fluid flowing through the sensors. The derived signals are compared against a diluent reference level signal to provide resultant signal outputs indicating to an operator or a monitoring device the presence or absence of emboli or other contaminants within the segmented portion of the fluid.
Abstract:
An aperture module for obtaining signals from microscopic particles suspended in a sample blood solution which passes through a scanning aperture. A module housing including an aperture holder is mounted on a container or bath containing a body of the particulate liquid suspension to be tested. The aperture holder with aperture formed therein extends into the vessel to permit passage of the sample through the aperture to an outlet chamber immediately behind the aperture. The chamber is connected to a source of clean electrolyte and has a narrowed or reduced dimension portion positioned immediately behind the aperture. A vacuum is applied to the chamber to cause the sample to be drawn through the aperture for testing thereof. An optical hemoglobinometer is positioned in association with the bath to measure the hemoglobin content of the solution to be tested.
Abstract:
Method and apparatus (10) for detecting contaminants, including emboli, in a fluid sample prior to sample testing, wherein fluid density sensors (52F and 52R) are arranged on opposite sides of a fluid segmenting valve (48) to provide electrical signals indicative of the degree of optical opacity of the fluid flowing through the sensors. The derived signals are compared against a diluent reference level signal to provide resultant signal outputs indicating to an operator or a monitoring device the presence or absence of emboli or other contaminants within the segmented portion of the fluid.