The working principle of the double-cavity egg retrieval needle.

The double-lumen oocyte retrieval needle has two tubes. The inner tube is the same as the single-lumen tube, which is responsible for pumping out, and the outer tube is connected to another tube of needle, which is responsible for pumping inside. This is repeated aspiration.

It has the effect of scouring, and because of this, it does not need so much suction, and the eggs inside can be more gently sucked, which is the greatest protection for the eggs.

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