Two compartment locking sampling syringe

Claim 2

A multi-barrel two-compartment syringe for withdrawing blood from a vein whereby the first drawn blood is introduced into one compartment, and subsequently withdrawn blood is introduced into a second compartment without mixing the two samples which comprise: a. an innermost plunger member, b. an intermediate barrel member, and c. an outer barrel member, the said three members being in telescopic relationship and being independently movable along their mutual axis to form two separate compartments, a fitment on one end of the outer barrel for holding a hollow needle and having a channel for blood, a channel in one end of said intermediate barrel co-axially aligned with the channel in the fitment of the outer barrel member permitting blood to flow into said intermediate barrel member when the members having the two channels are in abutment, means on said intermediate barrel member for fixing the outer barrel member to the said intermediate barrel member to prevent axial movement with respect thereto, said means further comprising means releasing said outer barrel from said intermediate barrel member on predetermined axial movement of said plunger member and simultaneously fixing said plunger member to said intermediate barrel whereby said intermediate barrel is withdrawn from said outer barrel member and a compartment for holding blood is thus formed between the said outer barrel member and the intermediate member on continued withdrawal of the plunger.

Claim 3

A syringe in accordance with claim 1 in which the lowermost part of the intermediate barrel member has a downwardly extending tip with a channel, said tip fitting into a recess in the bottom of said outer barrel thus providing a compartment between the said outer and intermediate barrel members.

Claim 4

A multi-barrel two-compartment syringe for withdrawing blood from a vein whereby the first drawn blood is introduced into one compartment, and subsequently withdrawn blood is introduced into a second compartment without mixing the two samples which comprises: a. an innermost plunger member, b. an intermediate barrel member, and c. an outer barrel member, the said three members being in telescopic relationship and being independently movable along their mutual axis to form two separate compartments, a fitment on one end of the outer barrel for holding a hollow needle and having a channel for blood, a channel in one end of said intermediate barrel co-axially aligned with the channel in the fitment of the outer barrel member permitting blood to flow into said intermediate barrel member when the members having the two channels are in abutment, holding means on the intermediate barrel member to carry a locking means, locking means comprising a lever arm pivoted on said holding means with studs on each end, means on the outer barrel to engage a stud on the lower end of said lever arm and hold the intermediate barrel and outer barrel in fixed relationship, means on the innermost plunger for engaging a stud on the upper end of said lever arm, means tending to hold the stud on the upper end of the lever arm against the surface of the plunger and force the said stud into fixed engagement with engaging means on the innermost plunger when the relative position of the two members permits.

Claim 5

A multi-barrel two-compartment syringe for withdrawing blood from a vein whereby the first drawn blood is introduced into one compartment, and subsequently withdrawn blood is introduced into a second compartment without mixing the two samples which comprises: a. an innermost plunger member, b. an intermediate barrel member, and c. an outer barrel member, the said three members being in telescopic relationship and being independently movable along their mutual axis to form two separate compartments, a fitment on one end of the outer barrel for holding a hollow needle and having a channel for blood, a channel in one end of said intermediate barrel co-axially aligned with the channel in the fitment of the outer barrel member permitting blood to flow into said intermediate barrel member when the members having the two channels are in abutment, holding means on the intermediate barrel member to carry a locking means, locking means comprising a lever arm pivoted on said holding means with studs on each end, means on the outer barrel to engage a stud on the lower end of said lever arm and hold the intermediate barrel and outer barrel in fixed relationship, means on the innermost plunger for engaging a stud on the upper end of said lever arm, means tending to hold the stud on the upper end of the lever arm against the surface of the plunger and force the said stud into fixed engagement with engaging means on the innermost plunger when the relative position of the two members permits.