Читать книгу Veterinary Surgical Oncology - Группа авторов - Страница 62
Instrumentation and Implants Access Needles
ОглавлениеTraditional hypodermic needles or over‐the‐needle catheters (Figure 3.1) can be used to puncture vessels when obtaining vascular access using the Seldinger technique (Seldinger 1953). The size of the access needle used determines the wire size that can be introduced through the needle and into the vessel. The standard venous access needle is an 18‐gauge needle, which accepts guidewires up to 0.038 inches in diameter (Braun 1997). Needles that are 21‐ to 22‐gauge are considered to be micropuncture needles and allow for introduction of guidewires up to 0.018 inches in diameter (Braun 1997; Valji 2006).
Figure 3.1 Interventional oncology instrumentation. From left to right: (a) 18‐gauge over‐the‐needle catheter (left), 22‐gauge over‐the‐needle catheter (right). (b) 0.035‐inch hydrophilic guidewire. (c) Dilator and vascular access sheath. (d) Catheter with angled‐tip.