This may be relieved by tapping the cavity with a small hollow needle (Southey's trocar), or by passing into it a large sharp-pointed tube. [Please select]
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In urgent cases the gas must be allowed to escape without delay, and this is best accomplished by the use of the trocar. [Please select]
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The trocar is a sharp-pointed instrument incased in a cannula or sheath, which leaves the sharp point of the trocar free. [Please select]
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_ Trocar and cannula; 5_a_ shows the trocar covered by the cannula; 5_b_, the cannula from which the trocar has been withdrawn. [Please select]
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The instruments used are a small trocar and cannula, which are introduced between the eighth and ninth ribs. [Please select]
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When a large amount of effusion is present, tapping with the trocar and cannula is generally resorted to. [Please select]
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The drawing illustrates the method of puncturing the abdomen through the chest with a long trocar and cannula. [Please select]
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