Patent ID: 8540683

Claim:
A syringe device comprising: a reservoir having a reservoir sidewall defining an axis, the reservoir comprising a dispensing distal end defining a dispensing aperture and a proximal end defining a proximal aperture; and a piston member movably disposed in the reservoir, the piston member being configured to be movable between the distal end and the proximal end, the piston member being in movable sealing engagement with the reservoir sidewall; wherein the reservoir sidewall defines at least one longitudinally-extending vent extending distally a length from the proximal end of the reservoir, a depth of the at least one vent continually decreasing at an angle relative to the axis along a majority of the length of the vent as the at least one vent extends from the proximal end of the reservoir, the angle being constant along a majority of the vent, such that the at least one vent is configured to gradually and at least partially interrupt the sealing engagement between the piston member and the reservoir sidewall so as to allow a gas to enter the reservoir through the proximal aperture and past the piston member, as the piston member is moved from the distal end to the proximal end.