Repositionable tissue-engagement member and associated systems and methods
A tissue-engagement member having a pair of jaws movable between a closed configuration and an open configuration, an actuator movable to shift the jaws between the closed and open configurations, and a biasing element biasing the jaws into a closed configuration. The biasing element may be provided over a portion of the tissue-engagement member. A cam mechanism may be provided in operative association with at least one of the jaws and/or the actuator. The biasing element may operatively engage at least one of the jaws and/or the actuator to actuate the cam mechanism to return the jaws to a closed configuration from an open configuration. A manipulator having an actuator-engagement element may be provided to engage an actuation element operatively associated with the actuator. The actuator-engagement element may operatively engage the actuation element in a range of orientations.
1 . A tissue-engagement member comprising:
a pair of jaw members pivotably coupled together about a pivot point and each pivotable between a closed configuration with distal ends thereof engaging each other to grasp tissue against surfaces of the jaw members facing each other, and an open configuration with the distal ends spaced apart from each other to receive tissue between the jaws or to release tissue from between the jaws;
an actuator operatively engaged with said pair of jaw members to shift said jaw members between the closed configuration and the open configuration;
a biasing element encircling the exterior of a portion of at least one of said jaw members or a distal portion of said actuator to cause said jaw members to be biased into the closed configuration; and
a cam mechanism proximal to the pivot point and operatively associated with at least one of said actuator, said biasing element, or at least one of said jaw members and including a first cam element movable with respect to a second cam element to shift said jaw members between the closed configuration and the open configuration.
2 . The tissue-engagement member of claim 1 , wherein said actuator is shiftable against the force of said biasing element to shift said jaw members from the closed configuration to the open configuration.
3 . The tissue-engagement member of claim 2 , wherein said biasing element operatively engages at least one of said actuator or at least one of said jaw members.
4 . The tissue-engagement member of claim 1 , wherein said cam mechanism comprises a cam surface on one of said actuator or at least one of said jaw members.
5 . The tissue-engagement member of claim 4 , wherein said cam mechanism further comprises a cam follower on the other of said actuator or at least one of said jaw members.
6 . The tissue-engagement member of claim 4 , wherein said biasing element operatively engages one of said actuator or at least one of said jaw members to actuate said cam mechanism to return said jaw members to a closed configuration from an open configuration.
7 . The tissue-engagement member of claim 1 , further comprising a housing, said jaw member and said actuator positioned within a portion of said housing.
8 . The tissue-engagement member of claim 7 , wherein said biasing element operatively engages one of said actuator or said housing or at least one of said jaw members to bias said jaw members to a closed configuration.
9 . The tissue-engagement member of claim 1 , wherein said biasing element biases said actuator to hold said jaw members in the closed configuration.
10 . The tissue-engagement member of claim 1 , further comprising an actuation element coupled to said actuator and graspable to move said actuation element to shift said jaw members between the closed and open configurations.
11 . A tissue-engagement member comprising:
a pair of jaw members pivotably coupled together about a pivot and pivotable between a closed configuration and an open configuration;
an actuator operatively engaged with said pair of jaw members to shift said jaw members between the closed configuration and the open configuration; and
a biasing element positioned proximal to the pivot and encircling the exterior of a portion of at least one of said jaw members or a distal portion of said actuator to cause said jaw members to be biased into the closed configuration.
12 . The tissue-engagement member of claim 11 , wherein said biasing element is an elastic element positioned about said jaw members.
13 . The tissue-engagement member of claim 11 , wherein said biasing element encircles a distal portion of said actuator.
14 . The tissue-engagement member of claim 11 , further comprising a cam mechanism operatively associated with at least one of said actuator, said biasing element, or at least one of said jaw members.
15 . The tissue-engagement member of claim 14 , wherein said cam mechanism comprises a cam surface on one of said actuator or at least one of said jaw members.
16 . The tissue-engagement member of claim 15 , wherein said cam mechanism further comprises a cam follower on the other of said actuator or at least one of said jaw members.
17 . A tissue-engagement system comprising:
a tissue-engagement member having a distal end and a proximal end, said tissue-engagement member comprising jaws along the distal end pivotably coupled about a pivot point, an actuator along the proximal end, and a biasing element positioned proximal to the pivot point and encircling the exterior of a portion of at least one of said jaws or a distal portion of said actuator, wherein said jaws are shiftable between a closed configuration and an open configuration, said actuator is operatively engaged with said jaws via a cam mechanism to move said jaws between the closed and open configurations, and said biasing element shifts configurations as said jaws shift between the closed and open configurations and biases said jaws into the closed configuration; a tissue-engagement-member manipulator having a distal end configured to operatively engage with said tissue-engagement member to move said actuator axially to shift said jaws between the closed and open configurations; and a manipulator deployment system configured to deliver and to maneuver said tissue-engagement-member manipulator to move said actuator.
18 . The tissue-engagement system of claim 17 , wherein:
an actuation element in the form of a loop is operatively coupled with a proximal end of said actuator along the proximal end of said tissue-engagement member; and
an actuator-engagement element is provided on a distal end of said tissue-engagement-member manipulator and configured to engage with said actuation element in a range of orientations with respect to said actuation element.
19 . The tissue-engagement system of claim 17 , wherein said manipulator deployment system further comprises a flexible tubular element with a lumen defined therethrough, and a sheath, wherein said tissue-engagement-member manipulator is movable proximally into the lumen defined through said flexible tubular element to bring the proximal end of said tissue-engagement member into abutment with a distal end of said flexible tubular element, and said sheath is movable over the distal end of said flexible tubular element and over said tissue-engagement member to hold said tissue-engagement member in alignment with said manipulator deployment system.