| 摘要 |
2129332 9317626 PCTABS00025 A retracting tip trocar assembly (1) including a trocar tube (4) and a shaft (3) having a piercing tip (5) at one end thereof. The device includes a retracting mechanism (A) which allows the piercing tip (5) to be held in a cutting position upon application of an insertion force such as when the piercing tip (5) is pressed against a wall of a human body cavity. Upon release of the insertion force, such as when the piercing tip (5) passes through the wall, the retracting mechanism (A) causes the piercing tip (5) to be retracted into the trocar tube (4). The retracting mechanism includes two links (1) pivoting at one end to each other and at the other end respectively to the proximal end of the obturator shaft and to the handle housing (2a). |
