Tissue expanders having integrated drainage and moveable barrier membranes

A tissue expander having an integrated drain comprising:

• a shell having an injection port opening and one or more drainage holes;
• an injection port disposed in said injection port opening of said shell, wherein said injection port forms a fluid-tight seal with said shell;
• said injection port including a needle guard having a needle guard base with a top surface and a needle guard rim that extends upwardly from said needle guard base, wherein said needle guard rim surrounds an outer perimeter of said moveable barrier membrane;
• said injection port including a moveable barrier membrane overlying the top surface of said needle guard base, wherein said moveable barrier membrane is moveable between a first position for inflating and deflating said shell with a first fluid and a second position for draining a second fluid from outside said shell.

A tissue expander having an integrated drain comprising:

• a shell having an injection port opening and one or more drainage holes;
• an injection port disposed in said injection port opening of said shell, wherein said injection port forms a fluid-tight seal with said shell;
• said injection port including a needle guard having a needle guard base with a top surface;
• said injection port including a moveable barrier membrane overlying the top surface of said needle guard base, wherein said moveable barrier membrane is moveable between a first position for inflating and deflating said shell with a first fluid and a second position for draining a second fluid from outside said shell;
• said one or more drainage holes being formed in said shell for draining the second fluid from outside said shell.