Cuffless tracheal tube

1. A tracheal tube ventilating device comprising:

a tubular body configured to be inserted into the trachea of a patient and comprising a single generally annular sealing portion, wherein the generally annular sealing portion at or near a distal end of the tubular body comprises an electroactive polymer configured to undergo a clinically effective change in volume, thickness, or both upon application of an electrical potential to seal against an inner surface of the trachea while permitting the free passage of ventilating gas therethrough, the generally annular sealing portion having a central passage for conveying gas to and from the lungs, and wherein the central passage remains open when the electroactive polymer undergoes the clinically effective change in volume, thickness, or both; and

at least one electrical conductor coupled to the electroactive polymer and configured to apply the electrical potential.

2. The tracheal tube ventilating device of claim 1 , wherein the clinically effective change in volume, thickness, or both causes a change in an outside diameter of the sealing portion, a change in an inside diameter of the sealing portion, or a combination thereof.

3. The tracheal tube ventilating device of claim 2 , wherein the outside diameter undergoes a change of at least approximately 20% when the electrical potential is applied to the electroactive polymer.

4. The tracheal tube ventilating device of claim 3 , wherein the outside diameter undergoes a change of at least approximately 30% when the electrical potential is applied to the electroactive polymer.

5. The tracheal tube ventilating device of claim 2 , wherein the outside diameter undergoes a change sufficient to create an effective seal against the inner surface of the trachea.

6. The tracheal tube ventilating device of claim 1 , wherein the distal end of the tubular body comprises the sealing portion and the sealing portion comprises entirely electroactive polymer.

7. The tracheal tube ventilating device of claim 1 , wherein the sealing portion comprises a length of about 8 to 55 millimeters.

8. The tracheal tube ventilating device of claim 1 , wherein the sealing portion is located an anatomically relevant distance from the distal end of the tubular body and the sealing portion comprises entirely electroactive polymer.

9. The tracheal tube ventilating device of claim 1 , wherein the distal end of the tracheal tube comprises the sealing portion and an outer layer of the electroactive polymer is disposed on the tubular body.

10. The tracheal tube ventilating device of claim 1 , wherein the sealing portion is located an anatomically relevant distance from the distal end of the tubular body and an outer layer of the electroactive polymer is disposed on the tubular body.

11. The tracheal tube ventilating device of claim 1 , wherein the tubular body is operatively connected to a ventilator.

12. The tracheal tube ventilating device of claim 1 , wherein the electroactive polymer is selected from the group consisting of polypyrroles, polyanilines, polythiphenes, polyethylenedisoxythiophenes and mixtures thereof.

13. The tracheal tube ventilating device of claim 1 , wherein the clinically effective change in volume, thickness or both is at least approximately 20%.

14. The tracheal tube ventilating device of claim 13 , wherein the clinically effective change in volume, thickness or both is at least approximately 30%.

15. The tracheal tube ventilating device of claim 1 , wherein the electric potential is about 1 to 2 volts.

16. The tracheal tube ventilating device of claim 1 , wherein the tubular body comprises a first material;

wherein the electroactive polymer comprises a second material; and

further comprising a transition region joining the tubular body with the electroactive polymer.

17. The tracheal tube ventilating device of claim 1 , further comprising a lumen, wherein the at least one electrical conductor is disposed inside the lumen.

18. A tracheal tube ventilating device comprising:

a tubular body configured to be inserted into the trachea of a patient and comprising a single generally annular sealing portion, wherein the generally annular sealing portion located an anatomically relevant distance from the distal end of the tubular body comprises an electroactive polymer layer disposed on the tubular body, wherein the electroactive polymer is configured to undergo a clinically effective change in volume, thickness, or both upon application of an electrical potential to seal against an inner surface of the trachea while permitting the free passage of ventilating gas therethrough, the generally annular sealing portion having a central passage for conveying gas to and from the lungs, and wherein the central passage remains open when the electroactive polymer undergoes the clinically effective change in volume, thickness, or both; and

at least one electrical conductor coupled to the electroactive polymer and configured to apply the electrical potential.

19. The tracheal tube ventilating device of claim 18 , wherein the clinically effective change in volume, thickness, or both causes a change in an outside diameter of the sealing portion.

20. The tracheal tube ventilating device of claim 19 , wherein the outside diameter undergoes a change of at least approximately 20% when the electrical potential is applied to the electroactive polymer.

21. The tracheal tube ventilating device of claim 20 , wherein the outside diameter undergoes a change of at least approximately 30% when the electrical potential is applied to the electroactive polymer.

22. The tracheal tube ventilating device of claim 19 , wherein the outside diameter undergoes a change sufficient to create an effective seal against the inner surface of the trachea when the electrical potential is applied to the electroactive polymer.

23. The tracheal tube ventilating device of claim 18 , wherein the sealing portion comprises a length of about 8 to 55 millimeters.

24. The tracheal tube ventilating device of claim 18 , wherein the tubular body is operatively connected to a ventilator.

25. The tracheal tube ventilating device of claim 18 , wherein the electroactive polymer is selected from the group consisting of polypyrroles, polyanilines, polythiphenes, polyethylenedisoxythiophenes and mixtures thereof.

26. The tracheal tube ventilating device of claim 18 , wherein the clinically effective change in volume, thickness or both is at least approximately 20%.

27. The tracheal tube ventilating device of claim 26 , wherein the clinically effective change in volume, thickness or both is at least approximately 30%.

28. The tracheal tube ventilating device of claim 18 , wherein the electric potential is about 1 to 2 volts.

29. The tracheal tube ventilating device of claim 18 , further comprising a lumen, wherein the at least one electrical conductor is disposed inside the lumen.

30. A tracheal tube ventilating device comprising:

a tubular body configured to be inserted into the trachea of a patient and comprising a single generally annular sealing portion, wherein the generally annular sealing portion located an anatomically relevant distance from the distal end of the tubular body comprises an electroactive polymer layer disposed on the tubular body, wherein the electroactive polymer is configured to undergo a clinically effective change in volume, thickness, or both of at least approximately 20% upon application of an electrical potential to seal against an inner surface of the trachea while permitting the free passage of ventilating gas therethrough, the generally annular sealing portion having a central passage for conveying gas to and from the lungs, and wherein the central passage remains open when the electroactive polymer undergoes the clinically effective change in volume, thickness, or both;

at least one electrical conductor coupled to the electroactive polymer and configured to apply the electrical potential;

wherein the clinically effective change in volume, thickness, or both causes a change in an outside diameter of the sealing portion sufficient to create an effective seal against the inner surface of the trachea when the electrical potential is applied to the electroactive polymer;

wherein the sealing portion comprises a length of about 8 to 55 millimeters;

wherein the tubular body is operatively connected to a ventilator;

wherein the electroactive polymer is selected from the group consisting of polypyrroles, polyanilines, polythiphenes, polyethylenedisoxythiophenes and mixtures thereof;

wherein the electric potential is about 1 to 2 volts; and

further comprising a lumen, wherein the at least one electrical conductor is disposed inside the lumen.