What is a tissue expander used for?

A surgeon places the expander beneath the chest skin, often after breast tissue has been removed. It is an empty or partly filled device with a valve. During follow-up visits, sterile fluid may be added through the valve so the surrounding skin and soft tissue expand slowly. The process helps prepare the chest area for a permanent implant or another reconstruction method.

Expansion is planned around healing, the condition of the skin, and any other treatment. It can take place over several visits, and temporary tightness or pressure can occur after a fill.

Keep each review appointment so the team can assess healing and decide whether another fill is suitable. Follow wound-care instructions, avoid pressure or strenuous movement until cleared, and tell the team about increasing discomfort, skin colour changes, drainage, or fever. You can read about the device in [Tissue Expander](/materials/tissue-expander/) and the wider process in [Breast Reconstruction](/treatments/surgical-oncology/breast-reconstruction/).

Contact your surgical team promptly for fever, chills, worsening pain, spreading redness, warmth, pus-like drainage, wound opening, or skin that becomes dusky, pale, or increasingly tight. Seek urgent help for severe breathing difficulty, fainting, or rapidly worsening swelling.

Ask which reconstruction option the expander is preparing for, how often fills may be offered, what sensations are expected after a fill, and which activities or treatments could affect the timing of the next operation.