An endoscopic system comprising: a main body, the main body having an elongated tubular structure with a proximal end and a distal end; and a control section, the control section securable to the distal end of the main body, the control section including: a navigation section (624, 930), the navigation section configurable in such a way that at least a portion of the navigation section is selectively controllable to bend in a plurality of directions and curvatures; a first expandable member, the first expandable member configurable to transition between an expanded configuration and a non-expanded configuration, a second expandable member, the second expandable member configurable to transition between an expanded configuration and a non-expanded configuration, one or more pressure openings provided at a location between the first and second expandable members, the one or more pressure openings configurable to provide a negative pressure; characterized in that the first expandable member, when in the expanded configuration, includes a first side wall and a second side wall, the first side wall of the first expandable member having one or more first protrusions; the second expandable member, when in the expanded configuration, includes a first side wall and a second side wall, the first side wall of the second expandable member having one or more second protrusions, the first side wall of the second expandable member facing the first side wall of the first expandable member when the first and second expandable members are both in the expanded configuration: wherein one or more of the first protrusions and one or more of the second protrusions cooperatively form a sieve portion between the first and second expandable members, the sieve portion configured to block solids from passing through to one or more pressure openings. a main body, the main body having an elongated tubular structure with a proximal end and a distal end; and a control section, the control section securable to the distal end of the main body, the control section including: a navigation section (624, 930), the navigation section configurable in such a way that at least a portion of the navigation section is selectively controllable to bend in a plurality of directions and curvatures; a first expandable member, the first expandable member configurable to transition between an expanded configuration and a non-expanded configuration, a second expandable member, the second expandable member configurable to transition between an expanded configuration and a non-expanded configuration, one or more pressure openings provided at a location between the first and second expandable members, the one or more pressure openings configurable to provide a negative pressure; a navigation section (624, 930), the navigation section configurable in such a way that at least a portion of the navigation section is selectively controllable to bend in a plurality of directions and curvatures; a first expandable member, the first expandable member configurable to transition between an expanded configuration and a non-expanded configuration, a second expandable member, the second expandable member configurable to transition between an expanded configuration and a non-expanded configuration, one or more pressure openings provided at a location between the first and second expandable members, the one or more pressure openings configurable to provide a negative pressure; characterized in that the first expandable member, when in the expanded configuration, includes a first side wall and a second side wall, the first side wall of the first expandable member having one or more first protrusions; the second expandable member, when in the expanded configuration, includes a first side wall and a second side wall, the first side wall of the second expandable member having one or more second protrusions, the first side wall of the second expandable member facing the first side wall of the first expandable member when the first and second expandable members are both in the expanded configuration: wherein one or more of the first protrusions and one or more of the second protrusions cooperatively form a sieve portion between the first and second expandable members, the sieve portion configured to block solids from passing through to one or more pressure openings.