Expandable endoscopic hoods and related methods of use

Abstract

A medical device for tissue resection and related methods of use are disclosed. The device may include an elongate member having a proximal end and a distal end. The distal end of the elongate member may include a distal portion defining an end face and a cavity extending distally therefrom. The distal portion may further include multiple sections configured to transition between a first position and a second position different from the first position. The medical device may further include a mechanism configured to adjust a volume of the cavity by moving at least one of the multiple sections from the first position to the second position.

1 - 20 . (canceled) 
     
     
         21 . A medical device, comprising:
 a shaft having a proximal end and a distal end, the distal end including a plurality of sections configured to transition between a fully-closed position where the plurality of sections are in contact with one another, and an open position where each of the plurality of sections are spaced apart from one another, each of the plurality of sections including a pair of edges each extending from a first end to a second end of the corresponding section, wherein in the open position, adjacent edges of adjacent sections of the plurality of sections are unconnected by material to define an opening between the adjacent edges such that a circumferential space between the adjacent edges is free of material, and, in the fully-closed position, the plurality of sections define a distally-facing opening.   
     
     
         22 . The medical device of  claim 21 , wherein, in the fully-closed position, the plurality of sections form an open cylindrical member. 
     
     
         23 . The medical device of  claim 21 , wherein the distally-facing opening is smaller in the fully-closed position than in the open position. 
     
     
         24 . The medical device of  claim 21 , wherein each edge of the pair of edges is linear. 
     
     
         25 . The medical device of  claim 21 , further including a mechanism configured to move at least one of the plurality of sections from the fully-closed position to the open position. 
     
     
         26 . The medical device of  claim 21 , wherein the distally-facing opening is circular. 
     
     
         27 . The medical device of  claim 21 , wherein, in the fully-closed position, distalmost ends of adjacent sections are in contact with one another. 
     
     
         28 . The medical device of  claim 21 , wherein the plurality of sections consists of two sections. 
     
     
         29 . The medical device of  claim 28 , wherein the two sections are of different sizes. 
     
     
         30 . The medical device of  claim 21 , wherein the plurality of sections includes four sections. 
     
     
         31 . The medical device of  claim 21 , wherein at least one of the plurality of sections is biased towards the fully-closed position. 
     
     
         32 . The medical device of  claim 21 , wherein the shaft further includes a plurality of lumens extending between the proximal end and the distal end. 
     
     
         33 . The medical device of  claim 32 , further comprising a tissue cutting device disposed in one of the plurality of lumens. 
     
     
         34 . The medical device of  claim 21 , wherein at least one of the plurality of sections includes edges configured to cut through tissue. 
     
     
         35 . The medical device of  claim 21 , wherein each of the plurality of sections is concave when viewed from a central longitudinal axis of the shaft, and each concavity extends along an entire length of the respective section. 
     
     
         36 . A medical device, comprising:
 a shaft having a proximal end and a distal end, the distal end including more than two sections configured to transition between a fully-closed position and an open position, each of the more than two sections being in contact with at least two other sections in the fully-closed position, and spaced apart from each other section in the open position, wherein the more than two sections define a distally-facing opening in the fully-closed position.   
     
     
         37 . The medical device of  claim 36 , wherein each of the more than two sections includes a pair of edges each extending from a first end to a second end of the corresponding section, wherein in the open position, adjacent edges of adjacent sections of the more than two sections are unconnected by material to define an opening between the adjacent edges such that a circumferential space between the adjacent edges is free of material. 
     
     
         38 . A medical device, comprising:
 a shaft having a proximal end, a distal end, and a lumen extending therebetween;   a hood, at the distal end of the shaft, including a proximal end and a distal end, wherein the distal end of the hood includes more than two sections configured to transition between a fully-closed state and an open state, each of the more than two sections defining two longitudinally extending straight edges, the more than two sections defining a cavity extending distally from the end face of the shaft, wherein, when the more than two sections are in the fully-closed state, the hood is cylindrical and includes a circular distally-facing opening, and when the more than two sections are in the open state, the hood includes a side opening between each pair of adjacent longitudinally extending straight edges of adjacent sections of the more than two sections, wherein a circumferential space between each pair of adjacent longitudinally extending straight edges is free of material; and   a mechanism configured to move the four sections between the fully-closed state and the open state.   
     
     
         39 . The medical device of  claim 38 , wherein the more than two sections includes exactly four sections, and the distally-facing opening is smaller in the fully-closed state than in the open state. 
     
     
         40 . The medical device of  claim 39 , wherein the entireties of adjacent longitudinally extending straight edges of adjacent sections of the more than two sections contact one another to close the side opening in the fully-closed state.