Needle based helical coil safety device

摘要

The present disclosure describes anti-needle stick safety mechanism that is passively activated during the normal course of giving an injection. In one embodiment, the device includes a spring member coupled at a proximal end to a needle member and at a distal end to a needle cover. The passive activation of the device is triggered when the needle is inserted to a minimum depth into the patient's tissue to unleash the force of a compressed spring to urge a needle cover towards the distal end of the needle. As the needle is withdrawn from the tissue, the needle cover advances to the end of the needle and as it partially clears the end of the needle, it adopts an orientation that prevents the needle tip from re-emerging from the needle cover.

主权项

1. A passive safety device for use with a syringe comprising
a Luer needle having a Luer connector and a needle shaft extending from the Luer connector, the Luer needle having a first latch member, a helical spiral coil spring coupled at a proximal end to the Luer connector of the Luer needle, and a needle cover coupled to the helical spiral coil spring at a distal end and slidably receivable over the needle shaft, the needle cover having a second latch member cooperatable with the first latch member to retain the needle cover in a first refracted position along the needle shaft, wherein when the needle cover is retained in the first retracted position the helical spiral coil spring is biased to urge the needle cover to move to a second position partially beyond a distal tip of the needle shaft and oriented at an angle relative to a longitudinal axis of the needle shaft preventing the needle shaft from re-emerging from the needle cover, wherein the helical spiral coil spring is biased to axially and rotationally urge the second latch member into engagement with the first latch member to retain the needle cover in the first retracted position, wherein the needle cover is moveable proximally in an axial direction from the first retracted position to passively disengage the second latch member from the first latch member due to a proximal force exerted on the needle cover from contact with a patient's tissue during insertion of the Luer needle into the patient's tissue and upon proximal movement of the needle cover from the first retracted position, the spring being biased to rotationally urge the second latch member away from the first latch member to avoid reengagement of the first and second latch members upon distal movement of the needle cover as the Luer needle is withdrawn from the patient.