Device for biological cell collection and method of use
A device for collecting a biological sample in a subject, the device including an inflatable portion attached to a tubular member, and designed to expand from within the tubular member when inflated and to retract within the tubular member, a surface on the inflatable portion provided with varied thickness to facilitate movement of the inflatable portion between an expanded state and a retracted state, and a plurality of projections on the surface to allow collection of the biological sample when the inflatable portion is in the expanded state.
1. A device for collecting a biological sample in a subject, the device comprising:
a tubular member along which fluid can be directed;
a collection mechanism having (a) a proximal portion attached to a distal end of the tubular member, (b) a distal inflatable portion designed (i) to extend distally from within the proximal portion and expand when inflated and (ii) to retract within the proximal portion, (c) a wall of the distal inflatable portion provided with different durometer levels along its length such that the distal inflatable portion has a lower durometer than the proximal portion and (d) a plurality of circumferential geometric features radially extending from an outer surface of the collection mechanism, the plurality of circumferential geometric features defining varied thickness of the collection mechanism, to facilitate a combination of inflation, expansion, deflation, and retraction of the distal inflatable portion, in connection with movement of the distal inflatable portion between an expanded state and a retracted state;
a plurality of projections on a surface of the wall to allow collection of the biological sample when the distal inflatable portion is in the expanded state; and
a weight connected to the proximal portion to facilitate swallowing the collection mechanism.
2. A device of claim 1 , wherein the varied thickness is defined by collapsible folds circumferentially situated about the surface of the inflatable portion.
3. A device of claim 1 , wherein the collection mechanism is removable from and replaceable on the tubular member using at least one of a friction fit or a mechanical fit.
4. A device of claim 1 , wherein the varied thickness is defined by a plurality of ridges circumferentially positioned about the surface of the inflatable portion.
5. The device of claim 4 , wherein the plurality of ridges are positioned between each row of the plurality of projections to vary inflation size and shape of the inflatable portion.
6. The device of claim 4 , wherein the plurality of ridges help collect the biological sample.
7. The device of claim 4 , wherein the inflatable portion includes drafting extending along a length of each row of the plurality of projections to create a variable stiffness of the inflatable portion.
8. The device of claim 1 , wherein the tubular member is a catheter coupled to the collection mechanism at a distal end and a connector at a proximal end.
9. The device of claim 8 , wherein the connector is a Y-fitting with a first branch extending at an angle to a second branch of the connector, the second branch including a stopcock.
10. The device of claim 1 , wherein the inflatable portion has an outer surface facing radially outwardly when the inflatable portion is in an expanded condition, the outer surface facing radially inwardly when the inflatable portion is in an retracted position.
11. The device of claim 4 , wherein a first side wall of a tissue collecting projection extends generally perpendicular to the surface of the inflatable portion and a second side wall of the tissue collecting projection tapers toward the first side wall as the side walls extend radially outward from the surface when the inflatable portion is in a non-inflated position between retracted and expanded positions.
12. The device of claim 11 , wherein at least one of the plurality of projections has a V-shape, the first side wall facing in a proximal direction and forming an inner wall of the V-shape, the second side wall facing in a distal direction and forming an outer wall of the V-shape.
13. The device of claim 1 , wherein the inflatable portion has a durometer between 20-70 Shore A.
14. The device of claim 1 , further including a cap extending over the inflatable portion when the inflatable portion is in a retracted position to retain the inflatable portion in the retracted position.
15. The device of claim 1 , wherein the expanded state is facilitated by presence of positive pressure.
16. The device of claim 1 , wherein the retracted state is facilitated by presence of negative pressure.