The invention discloses a composite
sponge with better
water retention, a preparation method thereof, a negative pressure drainage dressing, a device and
medical equipment. The composite
sponge comprises the following components: alginate,
polyvinyl alcohol,
foaming agent, surfactant, cross-linking agent, acid catalyst, and deionized water. The preparation method of the composite
sponge comprises the following steps: stirring alginate,
polyvinyl alcohol and deionized water; sequentially adding
foaming agent, surfactant, crosslinking agent, acid catalyst, mixing, cooling, stirring and pouring into a mold , carry out the cross-linking reaction, cool and remove the mold and clean it. The alginate used in the present invention will not produce
precipitation in the acidic solution, which can promote the
water retention performance of the sponge to the greatest extent, reduce the
moisture volatilization of the composite sponge during use, change the
hardness of the dry composite sponge, and reduce the
impact of the dry sponge on The compressive force of the wound can reduce the pain of the patient and speed up the healing process of the patient's wound.