Airbag assembly

1. An airbag assembly comprising:

a plurality of pipes each having a distal end, the pipes being inflatable to an inflated position in which the distal ends are positioned in a circular configuration;

a plurality of interconnecting panels in alternating arrangement with the plurality of pipes, each interconnecting panel fixed to adjacent ones of the plurality of pipes; and

an uninflatable panel fixed to the distal ends of the plurality of pipes.

2. The airbag assembly of claim 1 , wherein the pipes in the inflated position are elongated along pipe axes.

3. The airbag assembly of claim 2 , wherein the plurality of interconnecting panels are elongated along axes parallel to the pipe axes.

4. The airbag assembly of claim 1 , wherein each pipe includes a proximal end, and wherein the plurality of interconnecting panels are fixed to the pipes between the proximal ends and the distal ends.

5. The airbag assembly of claim 1 , further comprising a plurality of tethers extending between the pipes.

6. The airbag assembly of claim 5 , wherein each tether extends between nonadjacent pipes.

7. The airbag assembly of claim 1 , wherein the pipes and interconnecting panels define a cavity therebetween, and further comprising a middle pipe in the cavity, each of the plurality of pipes and the middle pipe having a length, the length of the middle pipe being less than the lengths of the pipes.

8. The airbag assembly of claim 7 , wherein the middle pipe has a distal end and the uninflatable panel is fixed to the distal end of the middle pipe.

9. The airbag assembly of claim 1 , further comprising an inflator, a manifold in fluid communication with the inflator, and a plurality of fill tubes, each of the fill tubes in fluid communication with the manifold and a respective one of the pipes.

10. The airbag assembly of claim 1 , wherein the distal ends of the plurality of pipes are spaced from each other.

11. A seat assembly comprising:

a seat back;

a plurality of pipes each having a proximal end supported on the seat back and a distal end, the pipes being inflatable to an inflated position in which the distal ends are positioned in a circular configuration;

a plurality of interconnecting panels in alternating arrangement with the plurality of pipes, each interconnecting panel fixed to adjacent ones of the plurality of pipes; and

an uninflatable panel fixed to the distal ends of the plurality of pipes.

12. The seat assembly of claim 11 , wherein the pipes in the inflated position are elongated along pipe axes.

13. The seat assembly of claim 12 , wherein the plurality of interconnecting panels are elongated along axes parallel to the pipe axes.

14. The seat assembly of claim 11 , wherein the plurality of interconnecting panels are fixed to the pipes between the proximal ends and the distal ends.

15. The seat assembly of claim 11 , further comprising a plurality of tethers extending between the pipes.

16. The seat assembly of claim 15 , wherein each tether extends between nonadjacent pipes.

17. The seat assembly of claim 11 , wherein the pipes and interconnecting panels define a cavity therebetween, and further comprising a middle pipe in the cavity, each of the plurality of pipes and the middle pipe having a length, the length of the middle pipe being less than the lengths of the pipes.

18. The seat assembly of claim 17 , wherein the middle pipe has a distal end and the uninflatable panel is fixed to the distal end of the middle pipe.

19. The seat assembly of claim 11 , further comprising an inflator, a manifold in fluid communication with the inflator, and a plurality of fill tubes, each of the fill tubes in fluid communication with the manifold and a respective one of the pipes.

20. The seat assembly of claim 11 , wherein the distal ends of the plurality of pipes are spaced from each other.