METHOD OF TREATING EXTRASPHINCTER ANAL FISTULA USING LIGATURE-FRAME Russian patent published in 2025 - IPC A61B17/00 A61B17/12 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to proctology. Fistula is isolated from soft tissues from external fistulous opening on perineal skin to external sphincter of anal canal, without damaging external and internal anal sphincters, for this purpose, a fistulous passage is cut off at a lateral edge of an external sphincter, while preserving a portion of the fistula passing in the thickness of anal sphincters or extrasphincterically. Probe is then inserted through the internal fistulous opening in the outward direction, on the distal end of which a ligature of non-absorbable suture material 0-2 is fixed. Probe is pulled from the outside to the inside, together with the ligature fixed to it. Then the probe is cut off from the ligature and tied, forming a free movable loop – "ligature-frame", which passes through the internal fistulous opening and along the medial wall of the postoperative wound, covering the mucous-submucosal layer of the rectum, internal and external sphincters in the form of a ring. After the perineal wound is healed, the fistula formed along the ligature-frame is excised as a single block, followed by plasty of anal sphincters or plasty of the internal fistulous opening with a displaced rectal flap.

EFFECT: method enables eliminating an extrasphincter anal fistula with minimizing the risk of developing anal sphincter insufficiency, purulent-septic complications and recurrent disease by forming a fistulous passage with a direct passage located closer to the anal canal from the initial one.

1 cl, 4 dwg