Measuring dispensing device

Claim 1

A volumetric measuring pump for measuring a predetermined fixed volume of fluid comprising: syringe means including limit means formed thereon, plunger means at least partially disposed within said syringe means for reciprocal movement therein, stop means removably connected to said plunger means so as to move therewith and disposed in engageable relation to said limit means to limit the reciprocal movement of said plunger means, said stop means comprising at least one pin element extending outwardly from the sides of said plunger means and removably mounted thereon, said limit means comprising at least one elongated aperture formed longitudinally in the side wall of said syringe means in substantially surrounding relation to said pin means, said pin means extending through said aperture such that the longitudinal extremes of said aperture engage said pin means, whereby longitudinal movement of said plunger means relative to said syringe means is regulated in opposite directions; a variable volume suction chamber defined by the relative dispositions of the inner portions of said plunger means in the inner end of said syringe means, said syringe means including attachment means formed thereon, a disposable measuring tube mounted on said syringe means by said attachment means, said suction chamber disposed in fluid communication with the interior of said disposable measuring tube, said plunger means being movable from a first to second position within said syringe means to evacuate fluid from at least a portion of said variable volume suction chamber, said plunger means being movable from said second to said first position to draw fluid into said evacuated portion of said suction chamber, seal means fixedly connected to said plunger and movably disposed on the interior of said syringe and further disposed in fluid sealing relation between said suction chamber and the remainder of said plunger, whereby fluid is drawin into said disposable measuring tube because of the sealed relation of said plunger and said suction chamber and fluid communicating relation between said suction chamber and said measuring tube.