Locking syringe
First Claim
1. A locking syringe, comprising:
- a barrel including a set of internal threads;
a plunger disposed at lest partially within the barrel, the plunger comprising a set of external threads disposed on at least a portion of said plunger along the longitudinal axis thereof and which may threadably engage the set of internal threads; and
a triggering means attached to the plunger for selectively retracting said external threads, such that when the triggering means is actuated, the external and internal threads maintain a position of disengagement, thereby enabling the plunger to be freely moved with respect to the barrel.
2 Assignments
0 Petitions
Accused Products
Abstract
A syringe and method for use which may be selectively operated between a free position and a locked position. A triggering device configured with a trigger attached to the plunger of the syringe is employed. The triggering device includes a set of threads located on the plunger and a corresponding set of threads on the barrel of the syringe. Upon actuation of the trigger, the threads on the plunger are retracted from their position of engagement with the threads on the barrel, thereby placing the syringe in position for free movement of the plunger with respect to the barrel. The threads are biased in the engaged position. Thus, when the trigger is released, the threads on the plunger return to their position of engagement with the threads on the barrel. In the locked position, the plunger may be screwed into or out of the barrel by rotating the plunger, enabling the operator of the syringe to maintain strict control over the amount of pressure in the syringe. The triggering device employs a plurality of ramp and channel configurations which are disposed at approximately the same angle as the threads on the plunger and barrel. Thus, upon actuation of the triggering device, no net force results on the plunger which would cause movement of the plunger with respect to the barrel.
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Citations
28 Claims
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1. A locking syringe, comprising:
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a barrel including a set of internal threads; a plunger disposed at lest partially within the barrel, the plunger comprising a set of external threads disposed on at least a portion of said plunger along the longitudinal axis thereof and which may threadably engage the set of internal threads; and a triggering means attached to the plunger for selectively retracting said external threads, such that when the triggering means is actuated, the external and internal threads maintain a position of disengagement, thereby enabling the plunger to be freely moved with respect to the barrel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A locking syringe, comprising:
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a barrel including at set of internal threads; a plunger disposed at least partially within the barrel, the plunger comprising a set of external threads disposed on at least a portion of said plunger along the longitudinal axis thereof and which may threadably engage the set of internal threads; and a triggering means for selectively retracting said external threads such that when the triggering means is actuated, the external threads are retracted from their position of engagement with the internal threads to a position of disengagement, thereby enabling the plunger to be freely moved with respect to the barrel. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A syringe which may be selectively operated between a free position and a locked position, comprising:
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a barrel including a set of internal threads; a tip disposed at a first end of the barrel; a plunger disposed at least partially within the barrel, the plunger including a set of noncontinuous external threads which may threadably engage the set of internal threads; a handle attached to the plunger; and a triggering means attached to the handle for retracting the external threads from their position of engagement with the internal threads to a position of disengagement, thereby enabling the plunger to be freely moved with respect to the barrel. - View Dependent Claims (17, 18, 19, 23, 24, 25, 26, 27, 28)
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- 20. A syringe which may be selectively operated between a free position and a locked position as defined in clam 18, wherein the triggering means comprises at least one ramp and a corresponding channel which engages the ramp.
Specification