The invention relates to a device for treating fistulas, in particular a patient's perianal fistulas, which device comprises an elongated probe having a first end and a second end, which probe can be inserted into the entrance of the fistula channel with its first end via the external opening of the fistula in the patient's skin, in the direction of the internal opening of the fistulas inside the patient's body, for the purpose of passing a drainage thread through the fistula channel. The object of the invention is to provide a device for the treatment of fistulas, in particular perianal fistulas, which enables a painless treatment that can be carried out without anaesthesia, and to that end the drainage thread is attached to the second end of the elongated probe. This embodiment obviates the need for surgical treatment. The drainage thread is thus passed through the fistula channel, via the external fistula opening, by the elongated probe. By removing the probe from the patient's body via the internal, anal fistula opening and the anus, the two thread ends (one thread end projecting from anus and the other thread end extending from the external fistula opening) can be connected or tied together. This embodiment does not require surgery under anaesthesia, and in addition it is much less painful for the patient.
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