Resorbable oxidized cellulose embolization microspheres

A method for treating a tumor comprising:

• identifying at least one arterial blood vessel supplying blood to a tumor;
• guiding an implantation device comprising a plurality of oxidized cellulose microspheres through a lumen of the at least one arterial blood vessel;
• and
• implanting the plurality of oxidized cellulose microspheres into the lumen through the implantation device to at least partially block the lumen and impede supply of blood to the tumor.

A method for forming an embolism within a blood vessel comprising:

• selecting at least one of degree of oxidation or molecular weight distribution of oxidized cellulose of a plurality of oxidized cellulose microspheres to select a rate of degradation of the plurality of oxidized cellulose microspheres, the plurality of oxidized cellulose microspheres including an oxidized cellulose having a degree of oxidation from about 0.5 to about 0.7;
• contacting the plurality of oxidized cellulose microspheres with at least one cross-linking agent;
• and
• implanting the plurality of oxidized cellulose microspheres into a lumen of a blood vessel to at least partially block the lumen.