How to get raspberry flavor into a smoothie without seeds? I often enjoy (when it's not dead of winter) a fruit smoothie for breakfast; generally I use orange juice or some other juice flavor (V8 has a few with fruit flavors masking veggie tastes that I sometimes use), yogurt, and fruit I've frozen myself (removes the need for ice, leading to a thicker smoothie). Typically I use strawberries and bananas; however, when I purchase smoothies, my favorite flavors involve raspberry. I've tried purchasing frozen berries and tossing some in, but the seeds irritate me to no end. 

How can I get the taste of raspberries, preferably from raspberries themselves rather than extract (seems healthier), but not the seeds?
There are a couple common ways to deal with seeds in berries:


Use a food mill, which uses a rotating blade to crush the berries and force them through small holes. They're designed for this sort of thing - removing seeds or large pieces of pulp.
Do what the food mill does, but by hand: push them through a reasonably fine strainer/sieve. Unless they're really soft, you generally want to puree them first. You can also incorporate other ingredients first, to give more liquid to work with, so you don't have to do as much pushing.