Liquid dispensing syringe and method for reducing piston bounce

A piston for use with a dispensing syringe and a pressurized gas, the dispensing syringe having a barrel with a first end and a second end, and defining an interior reservoir having an inner surface, the piston comprising:

• a body configured to be slidably positioned within the interior reservoir of the barrel, the body having a distal end, a proximal end, a generally rigid portion, and an elastic portion, the proximal end configured to receive the pressurized gas such that the body moves toward the first end in order to decrease a volume of the interior reservoir proximate to the first end of the barrel and discharge a liquid contained therein, the elastic portion configured to expand under the influence of the pressurized gas;
• a first circumferentially extending wiper seal positioned on the generally rigid portion of the body between the distal and proximal ends, the first wiper seal configured to liquidly seal against the inner surface and inhibit the liquid within the interior reservoir from flowing proximally beyond the first wiper seal;
• and
• a second circumferentially extending wiper seal positioned on the elastic portion of the body proximally from the first wiper seal, the elastic portion being more flexible than the generally rigid portion and configured to force the second wiper seal to contact the inner surface with an increased pressure and an increased surface area to fluidly seal against the inner surface for inhibiting pressurized gas from flowing distally beyond the second wiper seal in order to reduce piston bounce.