| 摘要 |
Catheter including a pressure chamber defined by proximal and distal seals and inner and outer tubular members. An actuator member, moveable between first and second positions, is disposed within the pressure chamber. Fluid introduced into the pressure chamber applies a force on the actuator member to move the actuator member toward the second position. A lock mechanism, disposed between inner and outer tubular members, includes a latch having an engaged condition preventing movement of the outer tubular member relative the inner member and a disengaged condition allowing movement the outer member. The latch is shifted to the disengaged condition when the actuator member is moved to the second position. With the actuator member in the second position and the latch in the disengaged condition, fluid introduced through the fluid flow port and into the pressure chamber applies a force on the proximal seal to urge the outer tubular member proximally. |
| 主权项 |
1. A catheter comprising:
an inner tubular member having a proximal end portion, a distal end portion and an exterior surface, the inner tubular member further having a fluid lumen defined therein, the fluid lumen having a fluid flow port defined by the exterior surface along the distal end portion of the inner tubular member; an outer tubular member movable relative to the inner tubular member, the outer tubular member having a proximal end, a distal end and an interior surface directed toward the exterior surface of the inner tubular member; a proximal seal extending from the interior surface of the outer tubular member toward the exterior surface of the inner tubular member, the proximal seal located proximal to the fluid flow port; a distal seal extending from the exterior surface of the inner tubular member toward the interior surface of the outer tubular member, the distal seal located distal to the fluid flow port; a pressure chamber defined by the proximal seal, the distal seal, the exterior surface of the inner tubular member, and the interior surface of the outer tubular member; an actuator member disposed within the pressure chamber, the actuator member having a seal section and a cam section, the actuator member being moveable between a first position and a second position, wherein fluid introduced through the fluid flow port and into the pressure chamber applies a force on the seal section to move the actuator member from the first position toward the second position; and a lock mechanism disposed between the exterior surface of the inner tubular member and the interior surface of the outer tubular member, the lock mechanism including a body member secured to the outer tubular member, wherein the body member has a recess defined in an outer surface thereof, the outer tubular member received within the recess to form a trough along a portion of an exterior surface of the outer tubular member, the trough having a filler disposed therein to couple the outer tubular member to the body member of the lock mechanism, the lock mechanism further including a latch having an engaged condition to prevent movement of the outer tubular member relative the inner tubular member and a disengaged condition to allow movement of the outer tubular member relative the inner tubular member, the latch being shifted to the disengaged condition by the cam section when the actuator member is moved to the second position, wherein, with the actuator member in the second position and the latch in the disengaged condition, fluid introduced through the fluid flow port and into the pressure chamber applies a force on the proximal seal to urge the outer tubular member in a proximal direction. |
