Crude heparin sodium is the sodium salt of aminoglucosan sulfate extracted from the mucosa of pig small intestine. After dissociation, separation and purification of heparin and other steps, it can be prepared into a new type of low molecular weight heparin sodium anticoagulant, which has anticoagulant and antithrombotic effects.

　　Crude heparin sodium is the general name of a cluster of acid mucopolysaccharide mixtures with different molecular weight sizes. It is a linear chain molecule composed of six or eight sugar repeating units. The molecular weight is between 3000 and 30000, and the average molecular weight is about 15000.

　　Crude heparin sodium is yellow, brown, gray or similar color solid particles or powder. Insoluble in ethanol, acetone and other organic solvents, easily soluble in water. The molecule is acidic and is polyanion, which can react with cations to form salts.