Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
235 words
A medical pressure regulating syringe comprising a cylindrical syringe barrel having at its nozzle end a restricting opening, a resilient and flexible piston having at least one external, annular sealing rib slidable in said barrel in a fluidtight manner to draw and expel fluid into and out of said barrel through said opening, a hollow tubular piston shaft connected to said piston for sliding movement with said piston and with respect to said barrel, said piston having a cylindrical sidewall portion embracing a portion of the shaft, the internal wall of said cylindrical sidewall portion having an annular groove therein, said portion of said shaft having a reduced neck and a flange extending radially outwardly into said groove, said hollow shaft being connected with a chamber communicating with the interior of said hollow shaft and having a resilient and flexible wall to change the volume of said chamber, said chamber comprising an enlarged, flexible, resilient, squeezable bulb, said shaft and bulb being integral and of plastic, said piston having a passage therethrough providing continuous and uninterrupted communication between the interior of said hollow shaft and bulb and said barrel and opening, whereby fluid can be expelled from said hollow stem and chamber through said passage into said barrel and through said opening and can be drawn into said hollow stem and chamber from said barrel and opening through said passage by flexing said chamber wall.
Claim 2
Dependent Claim
235 words
A medical pressure regulating syringe comprising a cylindrical syringe barrel having at its nozzle end a restricting opening, a resilient and flexible piston having at least one external, annular sealing rib slidable in said barrel in a fluidtight manner to draw and expel fluid into and out of said barrel through said opening, a hollow tubular piston shaft connected to said piston for sliding movement with said piston and with respect to said barrel, said piston having a cylindrical sidewall portion embracing a portion of the shaft, the internal wall of said cylindrical sidewall portion having an annular groove therein, said portion of said shaft having a reduced neck and a flange extending radially outwardly into said groove, said hollow shaft being connected with a chamber communicating with the interior of said hollow shaft and having a resilient and flexible wall to change the volume of said chamber, said chamber comprising an enlarged, flexible, resilient, squeezable bulb, said shaft and bulb being integral and of plastic, said piston having a passage therethrough providing continuous and uninterrupted communication between the interior of said hollow shaft and bulb and said barrel and opening, whereby fluid can be expelled from said hollow stem and chamber through said passage into said barrel and through said opening and can be drawn into said hollow stem and chamber from said barrel and opening through said passage by flexing said chamber wall.
Claim 3
Dependent Claim
38 words
A syringe according to claim 1, said integral shaft and bulb being formed from a resilient, flexible and elastic plastic of the group consisting of polyethylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, natural rubber, synthetic rubber and combinations thereof.