Medical devices with detachable pivotable jaws
Medical systems, devices and methods are provided for engaging tissue, e.g. for clipping tissue, closing a perforation or performing hemostasis. Generally, the medical system including a housing, first and second jaws rotatable relative to the housing, a driver, and an elongate drive wire. The elongate drive wire may be disconnected from the driver, first and second jaws, and the housing, which are left in vivo engaged with the tissue.
1. A medical device for engaging tissue, the medical device comprising:
a housing defining an internal passageway and a longitudinal axis extending between proximal and distal ends of the housing, the internal passageway defined by an inner surface;
a first jaw rotatable relative to the housing, the first jaw having proximal and distal ends;
a second jaw rotatable relative to the housing, the second jaw having proximal and distal ends;
a driver engaged with the proximal ends of the first and second jaws, longitudinal movement of the driver rotating the first and second jaws relative to the housing, the driver including two locking tabs forming a socket facing proximally;
an elongated drive wire selectively connected to the driver for longitudinal movement therewith, the socket of the driver receiving the distal end of the drive wire; and
the inner surface of the internal passageway guiding longitudinal movement of the driver, the inner surface including a proximal portion and a distal portion, the distal portion having a width smaller than the proximal portion, the distal portion sized to press the locking tabs into engagement with the drive wire, wherein the proximal section of the inner surface is sized relative to the socket such that, when the socket is within the proximal section, the socket releasably engages the enlarged portion of the drive wire;
wherein the locking tabs of the socket have a natural, unbiased configuration where the socket is engaged with the drive wire when the locking tabs are in the proximal portion.
2. The medical device of claim 1 , wherein, when the locking tabs are positioned in the distal portion of the inner surface, the locking tabs are firmly pressed into frictional engagement with the drive wire.
3. The medical device of claim 2 , wherein the distal end of the drive wire defines an enlarged distal head, and wherein the locking tabs are pressed into engagement with the drive wire at a position proximal to the distal head.
4. The medical device of claim 1 , wherein the inner surface includes two surfaces on opposing sides of the housing corresponding to the two locking tabs.
5. The medical device of claim 4 , wherein the two surfaces defining the inner surface are formed as grooves.
6. The medical device of claim 1 , wherein the inner surface includes a shoulder at the transition between of the proximal and distal portions, the shoulder facing proximally, and wherein the locking tabs are positioned to engage the shoulder to limit longitudinal movement of the driver after they have been moved laterally outwardly by the enlarged portion of the drive wire.
7. The medical device of claim 1 , wherein the medical device is operable between first, second and third configurations, the driver non-detachably connected to the drive wire in the first configuration, the driver detachably connected to the drive wire in the second configuration, and the driver detached from the drive wire in the third configuration.
8. The medical device of claim 7 , wherein the locking tabs are positioned at an entrance to the socket and moves to vary the size of the entrance, and wherein the entrance has a smallest size in the first configuration, and a largest size in the third configuration.
9. The medical device of claim 8 , wherein the locking tabs are pressed against the drive wire in the first configuration.