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US 8,801,675 B2Granted
Syringe with adjustable two piece plunger rod
AssigneeBecton Dickinson France
InventorsJames Janish, Mark Sebree, Glenn D. Kopf
Life of this patent
Estimating the term…
Abstract
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.
Claims26
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;
- and
- an 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.
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;
- and
- an 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.
1 more element
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;
- and
- an 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.
1 more element
Dependencies are inferred from the claim text.