Retractable needle for blood gas sampling

Patent metadata

Field	Value
Publication number	US-9320469-B2
Application number	US-201414546483-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	Dec 14, 2012
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

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.

First claim

We claim:

1. A medical device useful for blood and blood gas sampling that is selectively attachable to and detachable from a conventional needleless syringe having a plunger, the medical device comprising:
a frontal attachment further comprising
a forwardly projecting retractable 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 the needleless syringe, and
a needle retraction chamber laterally spaced apart from the connector body;

wherein the frontal attachment and the connector housing are disposed in adjacent and laterally slidable relation to each other with the retractable needle and the connector body aligned during blood and blood gas sampling with a sealing element disposed between them to restrict fluid leakage during any relative movement between them; and
wherein, following blood and blood gas sampling when attached to a needless syringe, the retractable needle is retracted by shifting the frontal attachment laterally relative to the connector housing until the retractable needle is aligned with a needle retraction cavity inside the needle retraction chamber, which also shifts the filter plug into alignment with the connector body 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 of the needleless syringe relative to the filter plug following needle retraction.

2. The medical device of claim 1 in combination with a needless syringe.

3. The medical device of claim 1 wherein the filter plug is disposed in liquid-tight engagement inside an opening in the frontal attachment.

4. The medical device of claim 1 wherein the filter plug is made of material that allows pressurized air to be expelled through the filter plug without permitting leakage of blood through the filter plug.

5. The medical device of claim 1 wherein the connector body comprises a luer connector.

Assignees

• Retractable Technologies Inc
• Shaw Thomas J

Inventors

• Shaw Thomas J
• Small Mark
• Zhu Ni

Classifications

• A61B5/150244

  Rods for actuating or driving the piston, i.e. the cylindrical body that sits inside the syringe barrel, typically with an air tight seal, and slides in the barrel to create a vacuum or to expel blood · CPC title

• A61B5/150755

  Blood sample preparation for further analysis, e.g. by separating blood components or by mixing · CPC title

• A61B5/153 Primary

  {Devices} specially adapted for taking samples of venous or arterial blood, e.g. with syringes · CPC title

• A61M2205/7536

  allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes · CPC title

• A61M5/3232

  Semi-automatic needle retraction, i.e. in which triggering of the needle retraction requires a deliberate action by the user, e.g. manual release of spring-biased retraction means · CPC title