| 摘要 |
The invention is a new trocar, comprising a guide cannula and a removable insert provided with an extension and locking mechanism of the inner cannula, comprising a tubular connection body (26), an external cylinder (24) housed in the connection body (26), having vertical protrusions (241) with saw tooth-shaped upper end, an internal cylinder (25), housed in the external cylinder (24), a metal ring (23), housed around the protrusions (242) of the external cylinder (24), a multiple gear wheel (22), housed in the external cylinder (24) and on the internal cylinder (25), and a lower cylindrical part (223), having vertical protrusions (224) with saw tooth-shaped lower end (225). |
