Introducer Needle
Introducer Needle - Related Videos
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Introducing Shear Stress in the Study of Bacterial Adhesion
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Needle Thoracostomy
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Source: Rachel Liu, BAO, MBBCh, Emergency Medicine, Yale School of Medicine, New Haven, Connecticut, USA A tension pneumothorax is a life-threatening situation in which excess air is introduced into the pleural space surrounding the lung, either through trauma to the chest cavity or as a spontaneous leak of air from the lung itself. Air trapped within the pleural space causes separation of the lung from the chest wall, disrupting normal breathing mechanisms. Pneumothorax may be small without...
FAQs
The introducer needle’s key mechanical role is to create a temporary route for a guidewire. Once the needle enters the selected vessel, cavity, or tissue target, appropriate blood or fluid return indicates access. The guidewire can then pass through the needle, allowing the needle to be removed while preserving the established pathway for subsequent device placement.
Return provides procedural confirmation that the needle has reached the intended type of site before the next instrument is advanced. Blood return supports vascular access, whereas fluid return can indicate access to a body cavity or another targeted location. This check connects the initial puncture with usable access and helps determine whether the guidewire can be passed.
The guidewire sequence separates initial access from final device placement. After the needle establishes the route, the guidewire maintains that pathway while the needle is withdrawn. A catheter, sheath, or other instrument can then advance over the wire to the intended location, providing a controlled transition from puncture to the completed access route.
During a Seldinger-based workflow, the operator punctures the chosen site with the needle, checks for appropriate blood or fluid return, and passes a guidewire through the needle. The needle is then withdrawn, leaving the wire in position. A catheter, sheath, or other instrument advances over that wire to the intended location.
Clinical applications include vascular access, drainage, imaging-guided procedures, and minimally invasive interventions. The same access principle supports different targets, including blood vessels, body cavities, and selected tissues. Its usefulness comes from establishing a pathway for a later device, rather than requiring that larger catheter, sheath, or instrument to create the initial tissue entry.
Using an introducer needle as the initial entry point supports controlled access while limiting the size of the first tissue opening. The later catheter, sheath, or other device is delivered through the guidewire pathway instead of creating a separate initial route. This design is particularly relevant to imaging-guided procedures and minimally invasive interventions.