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Medical devices comprising a syringe barrel and a two-piece plunger rod are provided. According to one or more embodiments, the two-piece plunger rod includes a distal portion and proximal portion slidably mounted to the distal portion. The distal and proximal portions include a tab and plurality of

Medical devices comprising a syringe barrel and a two-piece plunger rod are provided. According to one or more embodiments, the two-piece plunger rod includes a distal portion and proximal portion slidably mounted to the distal portion. The distal and proximal portions include a tab and plurality of grooves which engage to adjust the overall length of the plunger rod to a plurality of locked lengths. The locked lengths of the plunger rod permit varying amount of fluid to be expelled from the barrel.

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1. A medical device comprising: a syringe barrel having a side wall with an inside surface defining a chamber for retaining fluid, an open proximal end, and a distal end including a distal wall having a passageway therethrough in fluid communication with the chamber, the open proximal end including

1. A medical device comprising: a syringe barrel having a side wall with an inside surface defining a chamber for retaining fluid, an open proximal end, and a distal end including a distal wall having a passageway therethrough in fluid communication with the chamber, the open proximal end including a peripheral flange; andan elongate plunger rod disposed within the barrel, the plunger rod comprising a distal portion, a proximal portion, and a stopper disposed on a distal end of the distal portion, the stopper having a distal face and a proximal end, the proximal portion of the plunger rod slidably mounted for axial movement with respect to the distal portion so that the overall length of the plunger rod is adjustable to a plurality of selectively lockable lengths between a compressed locked length and a fully extended locked length, thereby permitting varying amounts of fluid to be expelled from the barrel corresponding to the plurality of locked lengths, based on movement of the overall length of the plunger rod within the barrel. 2. The medical device of claim 1, wherein one of the distal portion or proximal portion slidably receives the other of the distal portion or proximal portion. 3. The medical device of claim 2, wherein the one or the other of the distal portion or proximal portion is hollow and the other of the distal portion or proximal portion is sized to be inserted into the hollow portion. 4. The medical device of claim 3, wherein the distal portion is hollow and the proximal portion includes a plurality of depressions spaced axially along the proximal portion that cooperate with a tab disposed on the distal portion to provide a plurality of locked positions and to provide a plunger rod that can have a plurality of locked lengths. 5. The medical device of claim 4, wherein each depression comprises a notch having a ramped surface and a stop face which engages the tab when the plunger rod is in a locked position. 6. The medical device of claim 5, further comprising indicia on the plunger rod that indicates the amount of fluid to be dispensed from the syringe when the plunger rod is advanced distally. 7. The medical device of claim 1, wherein the distal portion and proximal portion can be rotated with respect to each other, wherein in a first rotation position, the distal portion and proximal portion can be moved axially with respect to each other, and in a second rotation position, the distal portion and proximal portion can be locked to prevent relative axial movement of the distal portion and proximal portion. 8. The medical device of claim 7, wherein the first rotation position and second rotation position differ by about 90 degrees. 9. The medical device of claim 1, wherein the plunger rod is sized so that the distal face of the stopper contacts the distal wall of the syringe barrel when the plunger rod is advanced distally in a fully extended locked length, and the distal face of the stopper does not contact the distal wall of the syringe barrel when the plunger rod is advanced distally in a locked length that is less than the fully extended locked length. 10. The medical device of claim 9, wherein the device includes an intermediate locked length. 11. The medical device of claim 1, wherein the plunger rod further comprises a proximal end including a thumbpress and a thumbpress cap covering the thumbpress. 12. The medical device of claim 11, wherein the thumbpress cap is adapted to lock the thumbpress with the peripheral flange. 13. The medical device of claim 1, wherein one of the distal portion or proximal portion is slidably moveable within the other of the distal portion or proximal portion in a longitudinal direction of the plunger rod without rotating one of the distal portion or proximal portion with respect to the other of the distal portion or proximal portion. 14. A medical device comprising: a syringe barrel having a side wall with an inside surface defining a chamber for retaining fluid, an open proximal end, and a distal end including a distal wall having a passageway therethrough in fluid communication with the chamber, the open proximal end including a peripheral flange; andan elongate plunger rod disposed within the barrel, the plunger rod comprising a distal portion and a proximal portion disposed in a slidable, nested arrangement, the proximal portion having a thumbpress, one of the distal portion or the proximal portion having a projecting tab and the other of the distal portion or proximal portion having a plurality of grooves that cooperate with the tab so that the overall length of the plunger rod is adjustable between a plurality of selectively lockable lengths ranging from a compressed locked length to a fully-extended locked length so as to permit varying amounts of fluid to be expelled from the syringe barrel based on movement of the overall locked length of the plunger rod within the barrel,wherein one of the distal portion or proximal portion is slidably moveable within the other of the distal portion or proximal portion in a longitudinal direction of the plunger rod without rotating one of the distal portion or proximal portion with respect to the other of the distal portion or proximal portion. 15. The medical device of claim 14, wherein the grooves are spaced axially along the proximal portion and the tab is associated with the distal portion. 16. The medical device of claim 15, further comprising indicia associated with each groove to indicate an amount of fluid that will be expelled from the syringe when the thumbpress is advanced toward the barrel and prevented from further distal movement. 17. The medical device of claim 15, wherein the tab comprises a radially-inward projection which fits into at least one of the grooves to prevent relative axial movement of the distal portion and the proximal portion. 18. The medical device of claim 17, wherein the proximal portion includes an axially extending narrowed portion which permits the tab to slide along the proximal portion and allow the distal portion and proximal portion to be fully extended and compressed with respect to each other, and upon rotation of the proximal portion with respect to the distal portion, to permit the tab to engage at least one of the grooves. 19. The medical device of claim 14, wherein the device is enclosed within a package. 20. The medical device of claim 14, further comprising a thumbpress cap covering the thumbpress. 21. The medical device of claim 20, wherein the thumbpress cap is adapted to form a seal with the peripheral flange. 22. The medical device of claim 14, wherein the distal portion and proximal portion have a first rotation position and a second rotation position, wherein in the first rotation position, the distal portion and proximal portion can be slid axially with respect to each other, and in the second rotation position, the distal portion and proximal portion can be locked to prevent relative axial movement of the distal portion and proximal portion. 23. A medical device comprising: a syringe barrel having a side wall with an inside surface defining a chamber for retaining fluid, an open proximal end, and a distal end including a distal wall having a passageway therethrough in fluid communication with the chamber, the open proximal end including a peripheral flange; andan elongate plunger rod disposed within the barrel, the plunger rod comprising a distal portion and a proximal portion being slidable with respect to each other and including means for selectively regulating the overall length of the plunger rod between a compressed locked length and a fully-extended locked length to permit variable amounts of fluid to be expelled from the syringe, based on movement of the overall length of the plunger rod within the barrel,wherein the distal portion and proximal portion can be rotated with respect to each other, wherein in a first rotation position, the distal portion and proximal portion can be moved axially with respect to each other, and in a second rotation position, the distal portion and proximal portion can be locked to prevent relative axial movement of the distal portion and proximal portion. 24. The medical device of claim 23, wherein the chamber is pre-filled with a fluid selected from a medical flush solution and a medication. 25. The medical device of claim 23, wherein the plunger rod further comprises a proximal end including a thumbpress and a thumbpress cap covering the thumbpress. 26. The medical device of claim 25, wherein the thumbpress cap is adapted to lock the thumbpress with the peripheral flange.