A medical implantation device for spine is disclosed which includes a
flexible container with one end thereof being provided with an infusion
end and having one or more layers of flexible peripheral wall; and a
tubular component receiving the flexible container with the infusion end
and another end of the flexible contained exposing from two ends of the
tubular component, and the tubular component is to be implanted between
two adjacent spinous processes; wherein the tubular component has an
outer diameter greater than a distance between the two adjacent spinous
processes, and a medical filling is infused into the flexible container
via the infusion end thereof, so that an inflation of a middle section of
the flexible container is restricted by the tubular component and the
infusion end and the another end of the flexible container are inflated
to be movably pressed on the two sides of the two adjacent spinous
processes.