Microsyringe

Claim 2

A microsyringe comprising an elongated, slender capillary tube having an empty lumen, a needle cannula at a distal end of said tube in fluid communication with said lumen, and a connector hub at a proximal end of said tube for attachment to means for providing a fluid movement force into said lumen.

Claim 3

The microsyringe of Claim 1 wherein said capillary tube is cylindrically shaped.

Claim 4

The microsyringe of Claim 1 wherein said capillary tube is triangularly shaped.

Claim 5

The microsyringe of Claim 1 wherein said hub connector is slip-fitted on said tube to allow the proximal end of the tube to be exposed for capillary filling.

Claim 6

The microsyringe of Claim 1 wherein said capillary tube holds a volume of fluid not exceeding five hundred (500) microliters.

Claim 7

A microsyringe comprising an elongated hollow tube having a completely free lumen, a needle cannula at one end of said tube in fluid communication with said lumen, and a connector hub at the other end of said tube for attachment to means for providing a fluid movement force into said lumen.

Claim 8

A microsyringe comprising an elongated hollow tube having a completely free lumen, a needle cannula at one end of said tube in fluid communication with said lumen, and a connector hub at the other end of said tube for attachment to means for providing a fluid movement force into said lumen.

Claim 9

A microsyringe comprising an elongated, slender capillary tube having a lumen therethrough, a needle cannula at a distal end of said tube in fluid communication with said lumen, and a connector hub 3 t a proximal end of 4 tube for attachment to means for providing a fluid movement force into said lumen, and a slidable indicator in said lumen in fluid-tight engagement with the inside surface of said tube, said indicator being slidable under the influence of a fluid force entering said lumen for indicating the amount of fluid inside said tube.

Claim 10

A microsyringe comprising an elongated, slender capillary tube having a lumen therethrough, a needle cannula at a distal end of said tube in fluid communication with said lumen, and a connector hub 3 t a proximal end of 4 tube for attachment to means for providing a fluid movement force into said lumen, and a slidable indicator in said lumen in fluid-tight engagement with the inside surface of said tube, said indicator being slidable under the influence of a fluid force entering said lumen for indicating the amount of fluid inside said tube.

Claim 11

The microsyringe of Claim 7 wherein said slidable indicator is positioned completely within said lumen, said microsyringe further comprising means for preventing said slidable indicator from sliding out of said lumen.

Claim 12

The microsyringe of Claim 7 wherein said slidable indicator is made from an elastomeric material.

Claim 13

The microsyringe of Claim 7 wherein said slidable indicator is a floatation member which floats at the level of fluid in said lumen.

Claim 14

The microsyringe of Claims 1 or 7 wherein said capillary tube is translucent and has graduations on its outside surface to indicate specific volume measurements.

Claim 15

The microsyringe of Claim 7 wherein said capillary tube is rigid and is made of glass.

Claim 16

A microsyringe comprising an elongated hollow tube having a lumen therethrough, a needle cannula at one end of said tube in fluid communication with said lumen, a connector hub at the other end of said tube for attachment to means for providing a fluid movement force into said lumen, and slidable indicator means in said lumen in fluid-tight engagement with the inside surface of said tube, said indicator means being slidably responsive to a fluid force entering said lumen.

Claim 17

A microsyringe comprising an elongated hollow tube having a lumen therethrough, a needle cannula at one end of said tube in fluid communication with said lumen, a connector hub at the other end of said tube for attachment to means for providing a fluid movement force into said lumen, and slidable indicator means in said lumen in fluid-tight engagement with the inside surface of said tube, said indicator means being slidably responsive to a fluid force entering said lumen.

Claim 18

A syringe useful in handling small doses of fluid comprising: a barrel with a lumen extending therethrough, said lumen having two portions, a larger cross-sectional portion extending toward a proximal end of said barrel and a smaller cross-sectional portion extending toward a distal end of said barrel, said portions being in fluid communication with each other; a needle cannula at the distal end of said barrel in fluid communication with said smaller cross-sectional portion; and slidable piston means in fluid-tight engagement in said larger cross-sectional portion of said lumen adapted to provide a driving force for fluid movement through said lumen.

Claim 19

A syringe useful in handling small doses of fluid comprising: a barrel with a lumen extending therethrough, said lumen having two portions, a larger cross-sectional portion extending toward a proximal end of said barrel and a smaller cross-sectional portion extending toward a distal end of said barrel, said portions being in fluid communication with each other; a needle cannula at the distal end of said barrel in fluid communication with said smaller cross-sectional portion; and slidable piston means in fluid-tight engagement in said larger cross-sectional portion of said lumen adapted to provide a driving force for fluid movement through said lumen.

Claim 20

The syringe of Claim 14 wherein said barrel is an integral, unitarily formed structure, and is substantially cylindrically shaped.

Claim 21

The syringe of Claim 14 wherein said smaller cross-sectional portion of said lumen is a capillary tube.

Claim 22

The syringe of Claim 14 wherein said smaller cross-sectional portion of said lumen holds a volume of fluid not exceeding five hundred (500) microliters.