Single-use syringe
OwnerDavid Francis Capes, Patrick Chng Hang Khiang +2inventors
InventorsDavid Francis Capes, Patrick Chng Hang Khiang, Steven Lau Choon Meng, Hiang Seng Low
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Abstract
A single-use syringe comprises a barrel having a proximal end, a distal end and an inside surface, and a plunger rod having a proximal portion and a distal portion connected by a disengageable connection. The plunger rod further includes a stopper on its distal end. The disengageable connection is strong enough to hold the proximal and distal portions together during normal use of the syringe and disengageable upon application of an additional force applied to the proximal portion. A catch on the proximal portion of the plunger rod and a discontinuity in the chamber engage to prevent removal of the proximal portion from the barrel.
Claims22
A syringe comprising:
- a barrel including a fluid chamber having an inside surface, an open proximal end, and a distal end having a passageway therethrough in fluid communication with said chamber;
- a plunger rod having a longitudinal axis, a proximal portion and a distal portion connected by a disengageable connection, said distal portion including a stopper slidably positioned in fluid-tight engagement with said inside surface of said chamber for drawing fluid into and out of said chamber by movement of said plunger rod relative to said barrel;
- said disengageable connection being strong enough to hold said proximal portion and said distal portion together during normal use of said syringe and disengageable upon application of an additional force applied to said proximal portion along said longitudinal axis;
- and
- a catch on said proximal portion of said plunger rod and a discontinuity in said chamber positioned so that upon further distal movement of said proximal portion, after disengagement of said disengageable connection, said catch engages said discontinuity to lock said proximal portion of said plunger rod in said barrel.
A syringe comprising:
- a barrel having a fluid chamber, an open proximal end, a distal end and an elongate tip extending from said distal end having a passageway therethrough in fluid communication with said chamber;
- a plunger rod having a longitudinal axis, a proximal portion and a distal portion connected by a disengageable connection, said disengageable connection being a breakable connection, said distal portion including a stopper slidably positioned in fluid-tight engagement with said inside surface of said chamber for drawing fluid into and out of said chamber by movement of said plunger rod relative to said barrel;
- said disengageable connection being strong enough to hold said proximal portion and said distal portion together during normal use of said syringe and disengageable upon application of an additional force applied to said proximal portion along said longitudinal axis;
- and
- an annular flange on said proximal portion of said plunger rod and a discontinuity in said chamber positioned so that upon further additional movement of the proximal portion, after disengagement of said disengageable connection, said flange engages said discontinuity to lock said proximal portion of said plunger rod in said barrel.
Dependencies are inferred from the claim text.