Of the Operation of the Fistula in Ano.
Fistula's are callous Ulcers: If one of these happen in the Fundament, and is open on the outside, it may be cur'd thus: After the Patient hath been laid upon his Belly on the side of a Bed, with his Legs asunder, the Surgeon makes a small Incision with his Knife in the Orifice of the Fistula, in order to pass therein another small crooked Incision-Knife, at the end of which is a Pointed Stilet with a little Silver Head which covers it, to the end that it may enter without causing Pain. When the Surgeon hath convey'd his Knife into the
Fistula, having the Fore-finger of his Left-hand in the Anus or Fundament, he pulls off its Head, holding the Handle with one Hand, and the Stilet that pierceth the Anus with the other; and at last draws out the Instrument to cut the Fistula entirely at one Stroke.
If the Fistula hath an Opening into the Intestine, an Incision is to be made on the outside at the Bottom thereof, to open it in the Place where a small Tumour or Inflammation usually appears, or else in the Place where the Patient feels a Pain when it is touch'd. If the Tumour be remote from the Anus, it may be open'd with the Potential Cautery, to avoid a greater Inconvenience. After having thus laid open the very bottom, the little Incision-Knife and Stilet, with its Head, is to be pass'd therein, the end of the Stilet is to be drawn thro' the Anus, and the Flesh is to be cut all at once. But if the Fistula be situated too far forward in the Fundament, the Sphincter of the Anus must not be entirely cut, otherwise the Excrements cannot be any longer retain'd. Lastly, when the Fistula hath been treated after this manner, all its Sinuosities or Winding-Passages ought likewise to be open'd, and the Wound being fill'd with thick Pledgets steept in some Anodyn, is to be cover'd with a Plaister and a Triangular Bolster; as also with the Bandage call'd the T.
C H A P. XIX.
Of the Suture or Stitching of a Tendon.
It is requisite to undertake this Operation when the Tendons are cut, and when they become very thick. If the Wound be heal'd, it must be open'd again to discover the Tendon, and the Part must be bended, to draw together again the ends of the Tendons. Then the Surgeon taking a flat, streight, and fine Needle, with a double waxed Thread, passeth it into a small Bolster, and makes a Knot at the end of the Thread, to be stopt upon the Bolster. Afterward he pierceth the Tendon from the outside to the inside, at a good distance, lest the Thread shou'd tear it, and proceeds to pass the Needle in like manner under the other end of the Tendon, upon which is laid a small Bolster, for the Thread to be ty'd in a Knot over it. Then he causeth the Extremities of the Tendons to lie a little one upon another, by bending the Part, and dresseth the Wound with some Balsam. It may not be improper here to observe, that Ointments are never to be apply'd to the Tendons, which wou'd cause 'em to putrifie, but altogether Spirituous Medicaments; and that the Part must be bound up, lest the Extension of it shou'd separate the Tendons.