| 摘要 |
<p>TWO-MODE TROCAR ASSEMBLY Abstract An obturator assembly (100) for penetrating tissue and being at least partially positionable within a cannula assembly (1000) includes an obturator housing (102), an 5 obturator shaft (104) connected to the obturator housing (102) and defining a longitudinal axis, a penetrating member adjacent the distal end of the obturator shaft (104) and an obturator shield (106) mounted about the obturator shaft (104) and having a distal shield nosy (206). The obturator shield (106) is adapted for longitudinal movement between an extended position where the penetration member is substantially enclosed within the o shield nose (206) and a retracted position where the penetrating member is at least partially exposed from the shield nose (206). A manually manipulative member is mounted to the obturator housing (102) and is adapted for rotational movement about the longitudinal axis and relative to the obturator housing (102) between an initial position corresponding to a first mode of operation where the obturator shield (106) is secured in 5 the extended position and the shield nose (206) is used to penetrate tissue, and a release position corresponding to a second mode of operation operatively releasing the obturator shield (106) to permit the obturator shield (106) to move to the retracted position thereof to expose the penetrating member for penetrating the tissue. The obturator assembly (100) may further include a latch member (180) disposed within the obturator housing 20 (102). The preferred latch member (180) is in operative engagement with the obturator shield (106) secure the obturator shield (106) in the extended position thereof. The latch member (180) is actuable to release the obturator shield (106) when the obturator housing (102) is mated with the cannula assembly (1000) to thereby permit movement of the obturator shield (106) toward the retracted position provided the manually manipulative 25 member is in the release position. The obturator assembly (100) further includes a release member which is mounted to the obturator housing (102) and operatively coupled with the latch member (180). The release member is positioned to engage the cannula assembly upon mating of the obturator housing and the cannula assembly to thereby displace the release member and cause actuation of the latch member. co C=>-= C14o 'rN</p> |
