Retractable Needle for Blood Gas Sampling

摘要

A medical device having a frontal attachment and a connector housing having at least a body part of an associated medical apparatus, the frontal attachment slidably engaging the connector housing and having a forwardly projecting, rearwardly biased needle and a needle retraction assembly, and the connector housing having a needle retraction cavity laterally offset from the needle in a first position, the needle retraction cavity being selectively movable relative to the frontal attachment following use to reposition the needle retraction cavity into alignment with the needle to permit retraction. The subject device is desirably specially modified for use in blood gas sampling by the addition of a filter plug.

主权项

1. A medical device comprising a retractable needle useful for blood and blood gas sampling and selectively attachable to and detachable from a conventional needleless syringe, the medical device comprising a frontal attachment further comprising a forwardly projecting needle, a needle retraction assembly and a filter plug laterally spaced apart from the needle retraction assembly; and a connector housing further comprising a connector body attachable to a needleless syringe and a needle retraction chamber laterally spaced apart from the connector body; the frontal attachment and the connector housing being disposed in adjacent and laterally slidable relation to each other with a sealing element disposed between them to restrict fluid leakage during any relative movement between them, and the filter plug being alignable with the connector body when the needle is aligned with the needle retraction chamber following relative sliding movement between the frontal attachment and the connector housing to prevent leakage of blood out of the medical device while permitting excess air to be expelled through the filter plug by advancing the plunger relative to the filter plug following needle retraction.