Blood filled pocket in abdomen after Smart Lipo. Is there a point where draining with a needle won't help?

Seromas can sometimes be difficult to empty out completely. If needles don't do the job, it is sometimes necessary to do more. Sometimes a drain needs to be placed. Other times a trip to the OR to clean things out is needed. Sometimes ultrasound is helpful to see how far the seroma extends.

It sounds like from your description that you have a fluid collection in the same space where the fat was removed. Occasionally, fluid accumulates in the space left behind following liposuction in a larger amount than the body can get rid of on its own and is known as a seroma. If the fluid is blood, it is called a hematoma. In either case, serial aspirations (removing the fluid by needle and syringe over a few days) and compression of the area usually takes care of it. In unusual cases where the fluid re-accummulates after many aspirations or when multiple office visits are not possible, placement of a temporary drain may help. In any case, this condition should be addressed in a timely fashion because, if left alone, there may be irreversible changes to the skin that may occur.

It sounds like you actually have a seroma which can happen after liposuction but is not common.  Repeated aspirations often do the trick.