Trocar.—The usual instrument used to be a simple round canula with a trocar, the point of which should be very sharp, and in the shape of a three-sided pyramid. It should be about three inches in length, and a quarter of an inch in diameter. It may for convenience have an india-rubber tube fixed to its side or end, for the purpose of conveying the fluid to the pail or basin, but any other additions or alterations have not been improvements. Lately surgeons have been diminishing the size of the tube so as to withdraw the fluid more slowly, and taking many precautions to insure the wound being kept aseptic.
Where to tap.—In the linea alba, midway between the umbilicus and pubes, or rather nearer the umbilicus. Here, there are no muscles nor vessels, the opening is a dependent one, and the bladder is quite out of the way of injury.
N.B.—It is a wise precaution, in every case where there is a possibility of doubt as to the state of the bladder, to pass a catheter. I have myself known at least one case in which a surgeon was asked to tap an over-distended bladder, as a case of ascites.
The Operation.—As there is great risk of syncope coming on during the operation, from the sudden relief to the pressure on the organs, a broad flannel bandage should be applied to the belly, the ends of which are split into three at each side, and crossed and interlaced behind. An assistant should stand at each side to make gradual pressure by pulling on the ends of the bandage, thus assisting the flow, and maintaining the pressure. A hole should be cut in the bandage at the spot where the puncture is to be made, and the trocar inserted by one firm push, without any preliminary incision, unless the patient is inordinately fat. As the trocar is withdrawn, the canula should be pushed still further in. The surgeon should be ready at once to close the canula with his thumb, if the flow begins to cease, lest air should be admitted. If the flow ceases from any cause before all the fluid seems to be evacuated, the trocar should not be re-introduced, lest the intestines be wounded, but a blunt-headed perforated instrument fitting the canula should be inserted.
When all the fluid that can be easily obtained is evacuated, the canula may be withdrawn, and a pad of lint secured over the wound by strapping.
Gastrotomy.—Cutting into the stomach for the extraction of a foreign body has now been performed at least ten times, and all but one recovered. A typical example is that by Dr. Bell of Davenport, who removed a bar of lead one pound in weight and ten inches in length, by an incision four inches in length from the umbilicus to the false ribs. The opening into the stomach was as small as possible, and required no sutures.
Gastrostomy has within the last few years been practised very frequently. Gross has collected 79 cases, 57 of which were for carcinoma of œsophagus, all of which died within a few weeks, except eight who survived for periods varying from three to seven months. The results in cases of cicatricial and syphilitic strictures are more favourable.—Howse's method seems the best, consisting of two stages.
1. A curved incision is made through the parietes parallel with, and a finger-breadth below, the lower margin of chest wall on left side, the peritoneum should be opened at the linea semilunaris, the stomach sought for, and then attached to the abdominal wall by an outer ring of sutures and to the edge of the wound by an inner ring. It should then be dressed with carbolised lint and supported by a bandage.
2. A small opening should be made four or five days after the first stage and the patient should be fed through this opening.
For full details, see Mr. Durham's paper in vol. i. of Holmes's Surgery, edition of 1883, pp. 801-4.