Plunger systems
First Claim
Patent Images
1. A plunger for use in a syringe, the plunger comprising:
- a releasable connection mechanism adapted to make a releasable connection with an injector drive member comprising a piston, the piston being movable through an injector housing to control the movement of the plunger, the connection mechanism including at least two relatively flexible capture members projecting rearwardly from a rear surface of the plunger, the capture members adapted to flex radially outwardly when contacted by the piston to form a releasable engagement with the piston when the piston and the capture members are in an engagement position relative to each other, the capture members further being adapted to release the piston upon relative rotation of the capture members to a disengagement position relative to the piston.
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Accused Products
Abstract
The plunger systems for use in an injector-actuated syringe of the present invention include a dynamic wedge seal which improves the sealing engagement between the plunger cover and syringe barrel, and flexible capture members extending from the rear surface of the plunger which permit the engagement and disengagement of the plunger from the injector drive means at any plunger position within the syringe. Further, the plunger systems include a contrast saving tip which expells the injection liquid from the syringe tip.
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Citations
20 Claims
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1. A plunger for use in a syringe, the plunger comprising:
a releasable connection mechanism adapted to make a releasable connection with an injector drive member comprising a piston, the piston being movable through an injector housing to control the movement of the plunger, the connection mechanism including at least two relatively flexible capture members projecting rearwardly from a rear surface of the plunger, the capture members adapted to flex radially outwardly when contacted by the piston to form a releasable engagement with the piston when the piston and the capture members are in an engagement position relative to each other, the capture members further being adapted to release the piston upon relative rotation of the capture members to a disengagement position relative to the piston. - View Dependent Claims (2)
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3. A syringe for use with an injector comprising a piston, the syringe comprising:
a plunger having a releasable connection mechanism adapted to make a releasable connection with the piston, the connection mechanism including at least two relatively flexible capture members projecting rearwardly from a rear surface of the plunger, the capture members adapted to flex radially outwardly when contacted by the piston to form a releasable engagement with the piston when the piston and the capture members are in an engagement position relative to each other, the capture members further being adapted to release the piston upon relative rotation of the capture members to a disengagement position relative to the piston. - View Dependent Claims (4)
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5. A plunger for use in a syringe, the plunger comprising:
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a plunger surface including a seal portion contacting an inner wall of the syringe and forming a seal therewith; a base over which the plunger surface is placed, the base including a side portion having a angle of taper wherein the diameter of the side portion decreases from a rearward axial position to a forward axial position thereof, the diameter of an inner wall of the seal portion of the plunger surface decreasing from rearward to a forward axial position at an angle approximately equal to the angle of taper of the side portion of the base, the side portion of the base and the seal portion creating a dynamic seal with increases of internal pressure within the syringe; and a releasable connection mechanism adapted to make a releasable connection with an injector drive member comprising a piston, the piston being movable through an injector housing to control the movement of the plunger, the connection mechanism including at least two relatively flexible capture members projecting rearwardly from a rear surface of the plunger, the capture members adapted to flex radially outwardly when contacted by the piston to form a releasable engagement with the piston when the piston and the capture members are in an engagement position relative to each other, the capture members further being adapted to release the piston upon relative rotation of the capture members to a disengagement position relative to the piston.
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- 6. An injector for use with a syringe, the syringe comprising a plunger having at least two relatively rigid capture members projecting rearwardly from a rear surface of the plunger, the injector comprising a piston, the piston being movable through an injector housing to control the movement of the plunger, the piston including a releasable connection mechanism comprising at least two radially movable piston flanges, the piston flanges adapted to move radially inward to form a releasable engagement with the capture members when the piston and the capture members are in an engagement position relative to each other and the piston is moved forward to contact the capture members, the piston flanges further being adapted to be released from the plunger upon relative rotation of the capture members to a disengagement position relative to the piston.
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9. An injection system comprising:
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an injector having an injector housing and a piston movable therein, the piston having means for releasably attaching the piston to a plunger; and a syringe releasably mountable to the injector housing and comprising a plunger moveably mounted therein, the plunger having means for releasably attaching the plunger to the piston, wherein at least one of the piston attachment means and the plunger attachment means is adapted to move to form a releasable engagement with the other of the piston attachment means and the plunger attachment means when the piston attachment means and the plunger attachment means are in an engagement position relative to each other and the piston is moved forward to contact the plunger attachment means, and further wherein the piston attachment means is adapted to be released from the plunger attachment means upon relative rotation of the plunger attachment means to a disengagement position relative to the piston. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification