Device for the extraction of blood

Claim 1

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, said hollow piston rod has a tapered bore, said bore decreasing in cross section from said piston towards said free end whereby a maximum suction is effected at said piston rod free end.

Claim 2

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, said hollow piston rod has a tapered bore, said bore decreasing in cross section from said piston towards said free end whereby a maximum suction is effected at said piston rod free end.

Claim 3

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, said hollow piston rod has a tapered bore, said bore decreasing in cross section from said piston towards said free end whereby a maximum suction is effected at said piston rod free end.

Claim 4

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, said hollow piston rod has a tapered bore, said bore decreasing in cross section from said piston towards said free end whereby a maximum suction is effected at said piston rod free end.

Claim 5

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, said hollow piston rod is tapered from said piston to said free end, and said piston rod has a similarly tapered bore whereby a maximum strength to weight ratio is obtained together with a maximum suction being effected at said piston rod free end.

Claim 6

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, said hollow piston rod is tapered from said piston to said free end, and said piston rod has a similarly tapered bore whereby a maximum strength to weight ratio is obtained together with a maximum suction being effected at said piston rod free end.

Claim 7

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston road extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for thE reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, a plug of resilient plastic, said plug having a knob and an adapter portion axially adjacent thereto, said adapter portion having a peripheral surface sealingly engageable with said tube and a conical axial bore receiving said piston rod free end, said axial bore being closed at its inner end.

Claim 8

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston road extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for thE reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, a plug of resilient plastic, said plug having a knob and an adapter portion axially adjacent thereto, said adapter portion having a peripheral surface sealingly engageable with said tube and a conical axial bore receiving said piston rod free end, said axial bore being closed at its inner end.

Claim 11

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, a granulate in said tube between said piston and said tube closed end, said granulate being a chemically inert substance for functioning as a separating agent between two blood fractions, and including surface proximate layers with embedded small glass particles, preferably fibres, partially projecting outwardly from the surface thereof.

Claim 12

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, a granulate in said tube between said piston and said tube closed end, said granulate being a chemically inert substance for functioning as a separating agent between two blood fractions, and including surface proximate layers with embedded small glass particles, preferably fibres, partially projecting outwardly from the surface thereof.

Claim 13

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent, said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, a granulate in said tube between said piston and said tube closed end, said granulate being a chemically inert substance for functioning as a separating agent between two blood fractions, and the particles of said granulate having a coating of a substance for retarding blood coagulation.

Claim 14

A device for the extraction of blood by means of a suction effect comprising a tube having a closed end and an open end, a one-piece piston assembly cooperatively telescoped within said tube, said piston assembly comprising a piston having an aperture therethrough, a hollow piston rod extending from said piston in communication with the aperture therein and extending out through said tube open end, said piston being in sealed engagement with the interior of said tube and said piston rod having axially elongated generally radially extending wings guidedly engaging the interior of said tube, said piston rod having a free end in the form of means for the reception of a needle in sealed engagement, a transversely disposed handle on said piston rod adjacent, said free end for withdrawing said piston assembly from said tube to produce a suction within said piston rod, a granulate in said tube between said piston and said tube closed end, said granulate being a chemically inert substance for functioning as a separating agent between two blood fractions, and the particles of said granulate having a coating of a substance for retarding blood coagulation.

Claim 15

A device for the extraction of blood by means of a suction effect, said device comprising a tube having a closed end and an open end, a one piece integrally molded piston assembly cooperatively telescoped within said tube, said piston assembly comprising an inverted cup shaped piston, a tubular rod, axially extending guides, and handle means; said cup shaped piston having a cylindrical portion in sliding sealed engagement with said tube and an end wall, said tubular piston rod being carried by said piston end wall in eccentric relation to said piston and tube and projecting out of said tube, said piston rod having a free end, means only at said free end for the mounting of a needle thereon, said axially extending guides projecting generally radially from said piston rod and Guidedly engaging said tube, at least two of said buides being of appreciably different radial dimensions due to the eccentricity of said piston rod relative to said tube, a bore in said piston end wall in communication with the interior of said piston rod, and said handle means on said piston rod being adjacent said free end.

Claim 16

A device for the extraction of blood by means of a suction effect, said device comprising a tube having a closed end and an open end, a one piece integrally molded piston assembly cooperatively telescoped within said tube, said piston assembly comprising an inverted cup shaped piston, a tubular rod, axially extending guides, and handle means; said cup shaped piston having a cylindrical portion in sliding sealed engagement with said tube and an end wall, said tubular piston rod being carried by said piston end wall in eccentric relation to said piston and tube and projecting out of said tube, said piston rod having a free end, means only at said free end for the mounting of a needle thereon, said axially extending guides projecting generally radially from said piston rod and Guidedly engaging said tube, at least two of said buides being of appreciably different radial dimensions due to the eccentricity of said piston rod relative to said tube, a bore in said piston end wall in communication with the interior of said piston rod, and said handle means on said piston rod being adjacent said free end.