Quantity indicating injection device
OwnerIda M. Pleznacinventor
Life of this patent
Estimating the term…
Abstract
A cartridge or injecting device for storing and dispensing medical solutions, such cartridge being characterized by a tubular member with a needle on one end having an opening therethrough communicating with the interior of the tubular member. A slidable drive stopper in the other end of the tubular member has thereon an elongated plunger for advancing and retracting the drive stopper. A non-retractable stopper in the tubular member, in contact with the forward end of the drive stopper, has therethrough a longitudinal opening. The non-retractable stopper is therefore shifted forwardly when the drive stopper is advanced thus serving as a visual indicator showing that medical solution has been ejected from the cartridge.
Claims5
An injecting device for medical solutions comprising a sealed cylindrical tubular medicament receiving and dispensing barrel member having indicia means thereon and including a needle means on one end and an acutating means on the other end, said actuating means having a sliding fluid tight drive piston thereon and received in the inside of said barrel member and positioned adjacent said other end, a medicament cavity in said barrel extending from said one barrel end toward said other end of said barrel, a means for indicating the quantity of medicament in said barrel cavity comprising a snug fitting plunger means also slidingly received in said barrel means with one end abutting but unattached to said piston and the other end facing said medicament cavity, said snug fitting plunger means having at least one longitudinally extending fluid by pass hole therethrough and defining a non-retractable plunger stopper whereby pressure by the piston on said non-retractable plunger aspirates residual medicament in said cavity and the non-retractable plunger stopper will remain in a fixed position in the barrel so that the indicia will indicate the position of the plunger and residual quantity of medicament is remaining in the barrel cavity.
Dependencies are inferred from the claim text.