Cannula guard and cannula for a syringe
First Claim
1. Apparatus for releasably securing a cannula to an end portion of a syringe comprising:
- a cannula body having a hub and an elongated cannula portion projecting from said hub terminating in a cannula tip, said body being formed of a plastic material and having a passage therethrough for transmission of a fluid, said cannula hub having a surface for engaging the end portion of the syringe; and
a cannula guard including a sleeve closed at one end and open at its opposite end for receiving said elongated cannula portion and a portion of said cannula hub within said sleeve;
said cannula guard and said cannula having cooperable surfaces, respectively, configured to transmit a torque applied to said cannula guard in a first direction to said cannula to engage the cannula and syringe end portion thereby to secure the cannula and syringe to one another and to enable relative rotation of said cannula guard and said cannula without transmission of substantial torque from said cannula guard to said cannula when a torque is applied to said cannula guard in a second direction opposite said first direction.
5 Assignments
0 Petitions
Accused Products
Abstract
A plastic cannula has a hub mounting a pair of flanges forming a Luer lock connection with a standard syringe having female threads about its distal end. A cannula guard receives the cannula and has radially inward projections for engaging portions of the cannula to rotate the cannula guard and cannula relative to the syringe to fix the cannula onto the syringe. The cannula guard is removed by rotating the guard in an opposite direction, causing projections along the inner surface of the cannula guard to ratchet past ribs on the cannula, enabling removal of the cannula guard from the cannula without applying sufficient torque to the cannula to remove the cannula from the syringe.
58 Citations
8 Claims
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1. Apparatus for releasably securing a cannula to an end portion of a syringe comprising:
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a cannula body having a hub and an elongated cannula portion projecting from said hub terminating in a cannula tip, said body being formed of a plastic material and having a passage therethrough for transmission of a fluid, said cannula hub having a surface for engaging the end portion of the syringe; and
a cannula guard including a sleeve closed at one end and open at its opposite end for receiving said elongated cannula portion and a portion of said cannula hub within said sleeve;
said cannula guard and said cannula having cooperable surfaces, respectively, configured to transmit a torque applied to said cannula guard in a first direction to said cannula to engage the cannula and syringe end portion thereby to secure the cannula and syringe to one another and to enable relative rotation of said cannula guard and said cannula without transmission of substantial torque from said cannula guard to said cannula when a torque is applied to said cannula guard in a second direction opposite said first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification