Medical device tube having suction lumen and an associated suctioning system
Various embodiments of a tracheal tube having a suction lumen are provided. For example, the suction lumen may be associated with two spaced apart pressure transducers, whereby a pressure drop between the transducers indicates that the suction lumen is free of blockages and a characteristic lack of pressure drop and/or particular pressure curve is indicative of a blockage. In addition, embodiments may include a tracheal tube with sensors configured to sense a buildup of secretions. The sensors may be located proximate to an opening in the suction lumen. In other embodiments, a blockage-clearing system for a suction lumen may be provided that blows air into the suction lumen to clear blockages. In particular, in certain embodiments, the blockage-clearing system may operate to create its own pressurized air source by utilizing the pressure change created in the suction line by a blockage.
1. A system comprising: a tracheal tube having a proximal end and a distal end configured to be inserted into a patient airway; a suction lumen associated with the tracheal tube and terminating in an opening that is proximal to an inflatable cuff; a vacuum source in fluid communication with the suction lumen; a gas reservoir configured to be in reversible fluid communication with the suction lumen via a valve; and a movable member configured to move in a first direction in response to negative pressure in the suction lumen such that air is drawn into the gas reservoir, wherein when the negative pressure in the suction lumen reaches a threshold, the valve opens and the air in the gas reservoir is pushed into the suction lumen by the movable member moving in a second direction.
2. The system of claim 1 , wherein the movable member comprises a deformable membrane, a spring, or a piston.
3. The system of claim 1 , wherein the moveable member moves towards the suction lumen to draw air into the gas reservoir.
4. The system of claim 1 , wherein the moveable member moves away from the suction lumen to push air into the suction lumen.
5. The system of claim 1 , wherein a spring force in the movable member controls movement in the first direction and the second direction.
6. The system of claim 1 , comprising a flap disposed between the suction lumen and the moveable member, wherein the flap provides a barrier between the suction lumen and the moveable member when in a closed position.
7. The system of claim 6 , wherein the flap moves in the first direction in response to negative pressure in the suction lumen.
8. The system of claim 1 , wherein movement of the moveable member in the first direction opens a one-way valve to enable a flow of the air into the gas reservoir.
9. The system of claim 8 , wherein the one-way valve moves to a closed position when the valve opens such that the one-way valve blocks a flow of gas into the gas reservoir.
10. The system of claim 1 , wherein the moveable member is disposed within a portion of the gas reservoir.
11. The system of claim 1 , wherein the valve moves toward the suction lumen when open such that the valve blocks fluid communication between the vacuum source and the suction lumen.
12. The system of claim 1 , wherein the gas reservoir is configured to pressurize the air.