Absorbable sponge with contrasting agent

Abstract

An absorbable sponge containing a contrasting agent (e.g, radiopaque agent) that can be introduced to a biopsy tract or other puncture wound site is provided. The contrasting agent permits identification of the site by fluoroscopy or other imaging techniques.

What is claimed: 
     
         1 . A liquid permeable, absorbable gelatin sponge that is prepared by a process that comprises: (a) preparing an aqueous gelatin solution; (b) adding an organic solvent in the aqueous gelatin solution to form a second solution; (c) incubating the second solution; (d) forming a foam from the second solution wherein a contrasting agent is added to the second solution at any step prior to forming the foam; and (e) drying the foam.