The Chiba needles come in sizes between 25-G and 18-G. These needles have beveled tips on both the stylet (pink) and outer cannula (blue). We typically use the 18-G Chiba needles for obtaining access to the lesion, and perform the fine needle aspiration with 22-G Franseen or Westcott needles.
The Franseen needle has multibeveled cutting edges on both the inner stylet (pink) and outer cannula (blue). The Franseen needles come in sizes between 22 G to 14 G.
The Westcott needle has a beveled tip and a notched outer cannula (blue). The side notch creates a second cutting edge and allows for aspiration of more material; however, the volume is often limited by the smaller sizes these needles come in (see below). The side notch is 2 mm in length and begins approximately 3 mm from the tip of the needle. The Westcott needles come in sizes between 22 G to 20 G.
Note: The images are highly stylized and may not be 100% accurate. You can use an image search to see manufacturers' versions of these needles (Chiba, Franseen, and Westcott)
What software did you use to draw and shade these pictures. They look excellent.
ReplyDeletejacox, Thanks for the comment. I used Adobe Illustrator to do the line drawings, and Photoshop for the coloring and shading.
ReplyDelete