The common or simple trocar and canula has certain disadvantages, inconveniences or defects, as one may please to term its shortcomings. One is the fact that we have no positive means of knowing just when the instrument is plunged properly, or to a sufficient depth, into the cavity, except by the amount of resistance encountered, unless the trocar is withdrawn from the canula, when, if we happen to have properly entered the cavity, no inconvenience will result. If we have not, it may be necessary to re-introduce the trocar and try again—a more or less bungling operation.
Another objection is the fact that in the event of desiring to use a rubber tube, either as a matter of convenience or otherwise, we can only, or rather we are obliged to make the attachment to the canula after the trocar has been withdrawn. This is quite inconvenient in some cases; especially
GETZ HL. A NEW COMBINED TROCAR AND CANULA AND ASPIRATING NEEDLE. JAMA. 1885;V(9):231. doi:10.1001/jama.1885.02391080007001b
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