Medical devices and related methods

A medical device comprising:

• a handle including a stationary body, a first movable body, and a second movable body;
• a first sheath coupled to the second movable body;
• a second sheath coupled to the first movable body, wherein the first sheath is disposed within a lumen of the second sheath, wherein the first sheath is movable relative to the second sheath;
• a third sheath coupled to the stationary body, wherein the second sheath is disposed within a lumen of the third sheath, wherein the second sheath is movable relative to the third sheath;
• and
• an end effector, wherein the end effector includes:
• a first loop, wherein a first proximal end of the first loop is coupled to the first sheath, wherein a second proximal end of the first loop is coupled to the second sheath, wherein at least a portion of the first loop includes a first plurality of teeth extending radially inward;
• and
• a second loop, wherein a first proximal end of the second loop is coupled to the first sheath, wherein a second proximal end of the second loop is coupled to the second sheath, wherein at least a portion of the second loop includes a second plurality of teeth extending inward,
• wherein distal movement of the first movable body extends a first portion of the first loop and a first portion of the second loop, and wherein proximal movement of the first movable body retracts the first portion of the first loop and the first portion of the second loop, and
• wherein distal movement of the second movable body extends a second portion of the first loop and a second portion of the second loop, and wherein proximal movement of the second movable body retracts the second portion of the first loop and the second portion of the second loop.

An end effector comprising:

• a first sheath;
• a second sheath, wherein the first sheath is disposed within a lumen of the second sheath, wherein the first sheath is movable relative to the second sheath;
• a third sheath, wherein the second sheath is disposed within a lumen of the third sheath, wherein the second sheath is movable relative to the third sheath;
• a first loop, wherein the first loop includes a first arm and a second arm, wherein the first arm of the first loop is coupled to the second sheath, wherein the second arm of the first loop is coupled to the first sheath, wherein the second arm includes a first plurality of teeth;
• and
• a second loop, wherein the second loop includes a first arm and a second arm, wherein the first arm of the second loop is coupled to the second sheath, wherein the second arm of the second loop is coupled to the first sheath, wherein the second arm includes a second plurality of teeth, and
• wherein each tooth of the first plurality of teeth and each tooth of the second plurality of teeth are equally spaced from an adjacent tooth.