Once the skin is pierced, the instrument must be directed obliquely upwards, so as to make the opening and position of the trocar dependent.
When it is evident the instrument is fairly entered, and not till then, the trocar is withdrawn, and the fluid allowed completely to drain off.
When the trocar is withdrawn the fluid may be allowed to flow so long as it keeps in a full equable stream; whenever it becomes jerky and spasmodic, the canula should be removed before the sucking noise of air entering the chest is heard.
The trocar may then be withdrawn, and the canula retained for at least forty-eight hours by a suitable bandage.
Any attempt to enter the trachea slowly with a blunt knife ortrocar will probably be unsuccessful, as the rings, especially in children, give way before the knife, which merely approximates the sides of the trachea without opening it.
The operation may be performed with a simple trocar and canula, round, about an eighth of an inch in diameter, and at least two inches in length.
There is a stop-cock between the trocar and syringe, and another at right angles to the syringe.
In such a case the bladder may be punctured from the outside by a curved trocar and canula, in either of two situations.
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.
In more chronic cases, where the quantity of fluid is large, and especially if it is thick and curdy, the exhausting syringe of Mr. Bowditch is an improvement on the simple trocar and canula.
As thetrocar is withdrawn, the canula should be pushed still further in.
It consists of a powerful syringe, which fits accurately to the trocar with which the puncture is made.
In selecting the point for using the trocar a spot on the left side equally distant from the last rib, the hip bone, and the transverse processes of the lumbar vertebræ must be chosen.
The incision is made in the same place that the trocar is inserted for puncturing that organ in cases of hoven.
If this can not be effected, a long trocar and cannula may be passed between the first two ribs and straight on beneath the spine until it punctures the abdomen.
Trocar and cannula; 5a shows the trocar covered by the cannula; 5b, the cannula from which the trocar has been withdrawn.
In the absence of the trocar and cannula, two or three of the first ribs may be cut from the breastbone, so that the hand may be introduced through the chest to puncture the diaphragm with an embryotomy knife and allow an escape of the water.
The trocar is to be used only in extreme or urgent cases, though everyone who has had experience in treating indigestion in cattle realizes that he has saved the lives of many animals by its prompt application.
In extreme cases tapping the pericardium with a trocar and cannula to draw off the fluid is resorted to, but the operation requires exact anatomical knowledge.
The trocar covered by the cannula is forced into the rumen, the trocar withdrawn, and the cannula allowed to remain until the gas has escaped.
The drawing illustrates the method of puncturing the abdomen through the chest with a long trocar and cannula.
Medicines are introduced directly into the first stomach by the use of an esophageal tube or through the cannula of a trocar passed into the paunch through the side.
A sharp-pointed knife or a cannula and trocar should be introduced in the palm of the hand and pushed into the center of the rounded mass so as to evacuate the water.
The cannula or sheath of the trocar should be left in the paunch so long as any gas continues to issue from it.
Then the trocar is to be withdrawn and the liquid will flow through the cannula and will be hastened by traction on the fore limbs.
The instruments used are a small trocar and cannula, which are introduced between the eighth and ninth ribs.
In spite of every care it has happened on many occasions that a pregnant uterus has been mistaken for an ovarian cyst, the abdomen has been opened and a trocar plunged into the uterus.
A pregnant uterus is also liable to be stabbed by an ovariotomy trocar when the condition is complicated with unilateral or bilateral ovarian cysts.
An overfull bladder has been mistaken for an ovarian cyst and been punctured with a trocar before the mistake was discovered.
Injuries of this kind are rarely likely to happen now, for the clumsy ovariotomy trocar is passing out of use.
Cadiot recommends the drainage of synovia with a suitable trocar and cannula and injecting a mixture consisting of tincture of iodin, one part, to two parts of sterile water, to which is added a small quantity of potassium iodid.
A quantity of synovia is then aspirated by means of a small trocar and care should be taken to observe all due aseptic precautions.
When the exudate has collected in a synovial cavity, such as a joint or bursa, it may be withdrawn by means of a trocar and cannula.
The abscess is first evacuated by means of a large trocar and cannula introduced obliquely through the overlying soft parts, avoiding any part where the skin is thin or red.
If fluid collects in sufficient quantity to seriously interfere with the heart action, the sack may be punctured with the trocar and cannula and the fluid withdrawn.
After using the trocarand cannula, the instrument should be cleaned by placing it in boiling hot water.
After the gas has escaped through the cannula, the trocar is replaced and the instrument withdrawn.
If the amount of effusion is large, puncture of the thoracic cavity with a trocar and cannula may be practised.
The X indicates the point where the wall of flank and rumen are punctured with trocar and cannula in "bloat.
If gas forms, thetrocar and cannula should be used.
The gaseous disturbances should be relieved by puncturing the wall of the intestine with the trocar and cannula.
Showing the point where the wall of flank and rumen are punctured with trocar and cannula in "bloat".
Bloating can be quickly relieved by puncturing the wall of the paunch with the trocar and cannula.
A puncture is made with a special trocarand canula in the lumbar region between the second and third or third and fourth lumbar spines.
The operation is performed with a combined instrument called the trocar and cannula.
In such cases the air may be absorbed, when a spontaneous cure is the result, but when the symptoms are urgent it is recommended that the air be removed by a trocar and cannula or by an aspirator.
The ease and safety with which the exploring-trocar can be used in cases of supposed obstruction of the cystic duct enable the physician to decide with confidence points which before could only be matters of mere {1093} conjecture.
The mode of performing this operation consists in the introduction of an exploring-trocar into the most prominent part of the tumor.
If puncture with the trocar or aspiration be practised, shall all the fluid be withdrawn at once?
The use of the exploring-trocar will usually suffice to clear up all doubts by the withdrawal of the characteristic fluid of the hydatid cyst or of pus.
To explore the interior of the gall-bladder an aspirator-trocar is introduced; any fluid intended for microscopical examination is then withdrawn, and through the canula a flexible whalebone bougie is passed.
The trocar or aspirating tube may pass between the convolutions and no escape of gas take place, or it may be followed by fecal extravasation into the peritoneal cavity.
The development of cancerous nodules in the margins of an opening made in the abdominal walls by a trocar is also evidence of cancerous disease of the peritoneum.
Repeated insertion of the needle-trocar is preferable when the abscess is small, but when the accumulation is large and sufficiently firm attachments to the abdominal parietes exist, a drainage-tube will be necessary.
If pus be reached, a larger trocar may be inserted to evacuate the cavity thoroughly.
The good effects of puncture with even such a crude instrument as the trocar is well exhibited in the statistics collected by Waring.
A portion of the skin is dissected back and the trocar and canula introduced, when the hydatid will often come away as the trocar is withdrawn.
Mr Dun says "that, should the trocar fail to extract it, it must be drawn to the surface by a small syringe made for the purpose.
I then introduced a trocar and canula, and drew off fifty ounces of pus, slightly tinged with blood.
He places the point of this instrument on the part to be perforated, and fixes it there, the point of the trocar being hitherto withdrawn within the canula; the stilet is then protruded, and both carried onwards into the bladder.
The trocar is now withdrawn, when an eyed-probe, armed with a skein of silk or piece of tape, is passed along the tube, upon removing which the operation is completed.
The fluid was evacuated by a small trocar and canula, the parietes shrank, and a very satisfactory cure resulted.
A small trocar was passed from the vestige of the orifice onwards, in the proper course, guided by the finger in the rectum.
When fairly passed within the cavity, the trocar is withdrawn entirely, and the fluid escapes through the canula—gentle pressure being employed towards the conclusion.
In all cases, where any doubt remains as to its true nature, an exploring needle or trocar should be introduced, which will at once determine the diagnosis.
A large roundtrocar is necessary for the purpose; and the puncture is made at the softest and most prominent point of the tumour, a small incision through the integument being premised.
When the swelling is large, and attended with alarming symptoms, the matter is most conveniently evacuated by a flat and long trocar and canula.
At this interval, close to the pubes, and in the median line, the trocar may be safely passed through the front wall of the bladder.
If the trocar pierce the bladder at this point, the seminal vessels converging to the prostate from either side, and the recto-vesical serous pouch behind, will escape being wounded.
If the ovarian dropsy form a considerable tumour in the abdomen, it may be readily reached by the trocar and cannula penetrating the line P Z.
In this method a trocar varying in length from six to fourteen inches is used.
The object is to have the point of the trocar pierce the right auricle of the heart.
By the use of the direct method to draw blood from the right auricle by means of the trocar there is always danger of rupturing the circulation.
For long time preservation, supplement the foregoing treatment by a special injection into the thickened extremity, either through an artery leading directly to the part or by trocar or hollow needle inserted under the skin.
The trocar should be inserted obliquely, the point of the trocar is to pass in the general direction of the left hip joint, while the open end of the trocar is to point in the general direction of the right ear.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "trocar" in a variety of sentences. We hope that you will now be able to make sentences using this word.
