... device is mainly composed of a sponge block and a drainage tube, wherein: the sponge block adopts a carboxymethyl chitosan/polyvinyl alcohol composite sponge, the drainage tube has at least one, and the tube body of each drainage tube is provided with a
... device is mainly composed of a sponge block and a drainage tube, wherein: the sponge block adopts a carboxymethyl chitosan/polyvinyl alcohol composite sponge, the drainage tube has at least one, and the tube body of each drainage tube is provided with a more