Retroinjection is a technique used to fill wrinkles, and the syringe is typically graduated to control the dose administered.

Example:

www.ajcsonline.org › ... › December 2012‎
Dermal graft is a free skin graft which is a section of human skin, taken surgically from ..... using syringe suction, suction, water-jet, laser, and ultrasound fat harvesting ..... of the bounded area, followed by retroinjection tunnels (usually 4 tunnels). ...... weigh the graduated onset of correction and the need for multiple treatment ...

I believe the doses are fractioned.


Apolipoprotein E Is Resistant to Intracellular Degradation in Vitro ...
www.jbc.org/content/275/12/8564.long‎
by PCN Rensen - ‎2000 - ‎Cited by 71 - ‎Related articles
Mar 24, 2000 - In the present study, we investigated whether retroendocytosis is a unique feature of apoE as ... uptake of both components by the liver (45–50% of the injected dose after 20 min). .... Radiolabeling of (Lipo)proteins .... Tubes were fractionated (24 × 0.5 ml) from top to bottom using a Multiprobe 104DT .

Just did some research on the web to see what they say. Retroinjection is not found. Fractioned is also not found.