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An introducer sheath (or simply sheath) is a sheath through which fluids or tools can be introduced (inserted) into a blood vessel. It is a surgical tool consisting of a tube inserted into the body to provide an access point and allow the insertion of other instruments into an artery or vein and a seal to maintain hemostasis. [ 1 ]
Illustration of an arterial catheter inserted in the left radial artery and covered with a dressing Arterial catheter (Seldinger technique) Arterial catheter (Punktion technique) An arterial line (also art-line or a-line ) is a thin catheter inserted into an artery .
Retractable sheath versions have much stronger ergonomic feel for the doctors and are made by companies such as Aditya Dispomed, Aspen Surgical and Southmedic. A few companies [who?] have also started to offer a safety scalpel with a reusable metal handle. In such models, the blade is usually protected in a cartridge.
Blood is aspirated from the catheter to confirm the position. Then, the free-end of the port catheter is inserted through the peel-off sheath. After the tip of the port catheter is confirmed at the aortocaval junction, the peel-off sheath is taken-off by peeling away with two hands. While peeling off, the port catheter should remain in-situ.
Pigtail catheter is a non-selective catheter with multiple side holes that can deliver large volumes of contrast into a blood vessel for imaging purposes. [29] Cobra catheter is a selective catheter used to catheterise downgoing vessels in the abdomen. Cobra catheters move forward by pushing and are removed by pulling. [30]
By changing the diagnostic catheter to a guiding catheter, physicians can also pass a variety of instruments through the catheter and into the artery to a lesion site. The most commonly used are 0.014-inch-diameter (0.36 mm) guide wires and the balloon dilation catheters. [citation needed]
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A central venous catheter (CVC), also known as a central line (c-line), central venous line, or central venous access catheter, is a catheter placed into a large vein. It is a form of venous access. Placement of larger catheters in more centrally located veins is often needed in critically ill patients, or in those requiring prolonged ...