Anal fistula is an abnormal connection between the lining on the inside of your anal canal (back passage) and the skin near your anus. An anal fistula can cause continues infection and pain. Symptoms usually get worse without surgery. The type of surgery you need will depend on where the fistula is. If the fistula id below or crosses the lower part of the sphincter muscles (the muscles around your anal canal that control when you open your bowels), your surgeon  will cut the fistula open to your skin and leave your wound open so that it can heal with healthy tissue. 

Preparation 

• Do not eat four hours before the operation.
• Before the operation, the doctor will conduct a brief consultation and examination, explain the examination process and risks, and sign a consent form for the operation.
• Remove dentures, jewelry and metal items.

Procedure

1. You will be given an IV and put to sleep.
2. The doctor will incise and scrape out the inflammatory tissue near the fistula. The wound does not need to be sutured, but gauze with disinfectant solution will be applied to the wound.

Follow-up and Recovery

• The nurse will clean your wound every day until it heals.
• Under normal circumstances, the wound will be packed with gauze, but there will still be blood oozing out initially. The wound must be cleaned every day and after defecation and soaked in gray manganese oxygen solution regularly.

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