Retrieval device and related methods of use

Abstract

A medical device and a method for manipulating a tissue are disclosed. The medical device includes two or more bars, a snare loop and a constricting element. Each bar includes a proximal end, and one or more distal ends, such that the bars are in close proximity at the proximal end. The snare loop maybe coupled to the distal ends of the bars. The constricting element maybe movably coupled to the bars, such that the constricting element expands the snare loop when positioned at the proximal end of the plurality of bars while the constricting element collapses the snare loop when positioned at the distal end of the plurality of bars, thus, keeping the distal end of the snare loop stationary with respect to the tissue.

1 - 20 . (canceled) 
     
     
         21 . A device comprising:
 a plurality of bars, wherein each bar has a proximal end and a distal end;   a snare loop having two proximal ends and a distal end, wherein each proximal end of the snare loop extends distally from the distal end of one of the plurality of bars; and   a band encircling the plurality of bars, wherein the band is slideable from a proximal region of the plurality of bars to a distal region of the plurality of bars;   wherein, in a first configuration, the band is located at the proximal region of the plurality of bars, the distal ends of the plurality of bars are spaced apart from one another, and the snare loop is expanded; and   wherein, in a second configuration, the band is located at the distal region of the plurality of bars, the distal ends of the plurality of bars are collapsed towards each other, and the snare loop is collapsed.   
     
     
         22 . The device of  claim 21 , further comprising a plurality of stiffening elements coupled to the plurality of bars. 
     
     
         23 . The device of  claim 21 , further comprising an actuation element coupled to the band, wherein a portion of the actuation element coupled to the band is moveable from the proximal region of the plurality of bars to the distal region of the plurality of bars. 
     
     
         24 . The device of  claim 23 , wherein the actuation element comprises one of a guidewire or a spring. 
     
     
         25 . The device of  claim 21 , wherein the snare loop is an electrocautery snare loop. 
     
     
         26 . The device of  claim 21 , wherein at least one of the plurality of bars includes a stop mechanism to limit movement of the band in a distal direction. 
     
     
         27 . The device of  claim 21 , wherein each of the proximal ends of the snare loop extends from within a lumen defined by one of the plurality of bars. 
     
     
         28 . The device of  claim 21 , wherein each of the proximal ends of the snare loop extends from the distal end of one of the plurality of bars in both the first configuration and the second configuration. 
     
     
         29 . A device comprising:
 a plurality of bars, wherein each bar of the plurality of bars has a proximal end and a distal end;   a snare loop extending distally from the distal ends of the plurality of bars; and   a band positioned radially outward of the plurality of bars and movable from a proximal region of the plurality of bars to a distal region of the plurality of bars;   wherein movement of the band to the proximal region of the plurality of bars expands the snare loop;   wherein movement of the band to the distal region of the plurality of bars collapses the snare loop;   wherein movement of the band to the distal region of the plurality of bars moves the distal ends of the plurality of bars radially inward;   wherein movement of the band to the proximal region of the plurality of bars moves the distal ends of the plurality of bars radially outward; and   wherein the snare loop extends from the distal ends of the plurality of bars when the snare loop is collapsed and when the snare loop is expanded.   
     
     
         30 . The device of  claim 29 , further comprising a plurality of stiffening elements coupled to the plurality of bars. 
     
     
         31 . The device of  claim 29 , further comprising an actuation element coupled to the band, wherein a portion of the actuation element coupled to the band is moveable from the proximal region of the plurality of bars to the distal region of the plurality of bars. 
     
     
         32 . The device of  claim 31 , wherein the actuation element comprises one of a guidewire or a spring. 
     
     
         33 . The device of  claim 29 , wherein the snare loop is an electrocautery snare loop. 
     
     
         34 . The device of  claim 29 , wherein at least one of the plurality of bars includes a stop mechanism to limit movement of the band in a distal direction. 
     
     
         35 . The device of  claim 29 , wherein each of the plurality of bars defines a lumen extending to the distal end, and the snare loop extends from within each of the lumens. 
     
     
         36 . A device comprising:
 a first bar having a proximal end and a distal end;   a second bar having a proximal end and a distal end;   a snare loop having a first proximal end that extends from the distal end of the first bar and a second proximal end that extends from the distal end of the second bar, wherein the snare loop extends from the distal ends of the first bar and the second bar when the snare loop is in a collapsed configuration and when the snare loop is in an expanded configuration; and   a band encircling the first bar and the second bar, wherein the band is moveable from a proximal region of the first bar and a proximal region of the second bar to a distal region of the first bar and a distal region of the second bar;   wherein, when the snare loop is in the expanded configuration, the band is located at the proximal region of the first bar and the proximal region of the second bar, and the distal ends of the plurality of bars are spaced apart from one another; and   wherein, when the snare loop is in the collapsed configuration, the band is located at the distal region of the first bar and the distal region of the second bar, and the distal ends of the plurality of bars are collapsed towards each other.   
     
     
         37 . The device of  claim 36 , further comprising an actuation element coupled to the band, wherein a portion of the actuation element coupled to the band is moveable from the proximal region of the first bar and the proximal region of the second bar to the distal region of the first bar and the distal region of the second bar. 
     
     
         38 . The device of  claim 37 , wherein the actuation element comprises one of a guidewire or a spring. 
     
     
         39 . The device of  claim 36 , wherein at least one of the first bar and the second bar includes a stop mechanism to limit movement of the band in a distal direction. 
     
     
         40 . The device of  claim 36 , wherein the first proximal end of the snare loop extends from within a lumen defined by the first bar, and wherein the second proximal end of the snare loop extends from within a lumen defined by the second bar.