The Rosen Feeder has an inner poly bag that is filled with baby food and inserted in the soft poly handle.  The inner bag can be sold pre-filled or as a fill-it-yourself unit.

There is a one-way air valve in the base of the handle that lets air in to collapse the bag and prevent air from going into the inner poly bag.  Food is dispensed through a slit in the rubber spoon.  The slit is widened by biting down on the back part of the spoon, and food can be sucked out.  A parent can also fill the spoon by squeezing the handle and forcing food into the spoon.  Great for one-handed feeding.  Click image to see how air valve works.  Squeezing handle collapses bag with valve closed by force of air.  Valve opens and air comes in to replace space left by food release.

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A pre-filled - totally disposable unit is being designed also.