English: Various settings of a 6
French pigtail catheter with locking string, obturator (also called stiffening cannula) and puncture needle. A. Overview B. Both puncture needle and obturator engaged, allowing for direct insertion. C. Puncture needle retracted. Obturator engaged. Used for example in steady advancement of the catheter on a guidewire. D. Both obturator and puncture needle retracted, when the catheter is in place. E. Locking string is pulled (bottom center) and then wrapped and attached to the superficial end of the catheter.
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Captions
Settings of a pigtail catheter with locking string, obturator and puncture needle.