An injection control device having a metered/controlled injection rate
proportional to the rate of withdrawal/injection, suitable for cosmetic
as well as other applications is described. For example, after the
cannula is advanced into an object, the cannula is withdrawn to create a
tract or tunnel within the targeted area. As the cannula is withdrawn,
filler material in the injection control device is uniformly deposited
into the tract or tunnel via the automatic metering system. The automatic
metering system incorporates a syringe activating mechanism coupled to a
system which is capable of proportioning the deposition rate to the
retraction/injection rate of the cannula. Accordingly, more consistent
and uniform distribution of the material injected can be achieved with
less cannula passes as well as requiring less dependence on the skills of
the practitioner of this device.