Colloid Osmometer

Colloid Osmometer
Colloid Osmometer
Colloid Osmometer
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Wescor's Colloid Osmometer combines simplicity, reliability and precision in the vital measurement of colloid osmotic pressure (COP) in hospital critical care and surgical centers. Developed with a singular purpose: to provide the physician with a patient's COP status before administering albumin or synthetic colloids and as a precise monitor of this therapy. With many advanced features, Wescor's Colloid Osmometer stands apart as the superior instrument for measuring COP.

The instrument measures the colloid osmotic pressure (COP) of solutions using a membrane-selectively impermeable to protein molecules-and a sensitive pressure transducer in an osmometer cell designed for optimum clinical performance. The transducer output signal is amplified and converted directly to pressure units displayed in easy to read digital format (LCD). The Wescor Colloid Osmometer is simple to operate and maintain.

Colloid osmotic pressure (COP, or oncotic pressure) is the equilibrium pressure exerted on a semi permeable membrane separating two solutions of differing osmolality, at least one of which contains membrane-permeable (colloid) particles.
Human physiology provides a very important example of such a system. The interstitial fluid, which normally contains electrolytes, diffusible non-electrolytes and relatively small amounts of protein (colloid) is separated from the vascular fluid (blood) by the semi-permeable vascular capillary membrane. The vascular fluid contains considerable amounts of protein solutes in addition to diffusible low molecular weight solutes. In response to differences in the osmolality of these two fluids, water
Serum colloid osmotic pressure is a vitally important factor influencing the quantity of water flux into the vascular compartment across vascular capillary membranes that display normal semipermeable characteristics. Its influence is reduced by the opposing capillary hydrostatic pressure; the net result, in normal circumstances, being a small pressure differential favoring water movement from the interstitial fluid into the vascular circulation. Starling first described the physiological significance of this system in 1896.

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