Treatment of Transsphicteric Fistula-in-ano by Method of Laser Thermoobliteration(FiLaC™).

Randomized Conrtolled Study: Fistula Laser Closure (FiLaC™) vs Monopolar Coagulation for Treatment of Complex Anal Fistulae.

This is a randomized, controlled, parallel study to compare the results of treatment for patients with transsphincteric fistulas-in-ano.

We are planning to eroll 120 patients in this study,the duration of the stady be 3 years. Each of two groups will include 60 people. Pationts in the first group will be assigned to get treatment of the fistula-in-ano by laser thermo-obliteration (FiLAC™), patietns of the second group will forego monopolar coagulation of the fistulas tract with suturing the internal fistulas opening.

Inclusion Criteria:

1. Informed consent to the study;
2. Patients with high transsphincteric fistula (>1/3), suprasphincteric fistula whithout abscesses;
3. The presence of a formed fistulous tract > 2 cm in length.

Exclusion Criteria:

1. Suprasphincteric fistula with abscesses or infiltrates;
2. Extrasphincteric fistula;
3. Length of fistula tract < 2 cm;
4. The presence of sever scars in the region of internal fistula opening, wide fistula opening > 5 mm;
5. Crohn's fistulae