Patent ID: 7428435

Claim:
A medical instrument for transdermally administering a medicine comprising a bag and an ionic medicine or an ionic medicine-containing substance sealed in the bag, said bag comprising an anion exchange membrane and a cation exchange membrane which are melt-adhered to each other along the peripheral edges thereof, said anion-exchange membrane and said cation-exchange membrane each comprising a film or sheet of a porous thermoplastic resin having a porosity of from 20% to 95%, and a cross-linked ion-exchange resin in the pores of said thermoplastic resin in a filling ratio of from 5% to 95% by weight, wherein said cross-linked ion-exchange resin contained in said cation exchange membrane is a cation-exchange resin and said cross-linked ion exchange resin contained in said anion exchange membrane is an anion-exchange resin.