Introducer Sheaths/Needles (ISN) are medical devices designed to facilitate the insertion of larger medical instruments or devices into the body, typically through a small incision or puncture site. These devices consist of a hollow tube or sheath, often made of flexible plastic or metal, with a sharp needle at one end and a handle or hub at the other. 

The needle is used to create the initial puncture in the skin or tissue, while the sheath provides a pathway for the insertion of catheters, guidewires, or other instruments into the body. Once the needle has been inserted to the desired depth, it is typically withdrawn, leaving the sheath in place to serve as a conduit for further procedures.

Introducer sheaths/needles are commonly used in various medical specialties, including interventional cardiology, radiology, and vascular surgery, to access blood vessels or other anatomical structures safely and efficiently. They help minimize trauma to surrounding tissues, reduce the risk of bleeding or other complications, and allow for smoother introduction of larger devices or implants.

These devices come in various sizes and configurations to accommodate different procedural requirements and patient anatomies. Some may feature additional components such as hemostatic valves or dilators to further facilitate instrument insertion and manipulation. Overall, introducer sheaths/needles play a crucial role in modern minimally invasive procedures, enabling healthcare providers to perform complex interventions with greater precision and patient comfort.

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