| CPC A61B 90/30 (2016.02) [A61B 1/00071 (2013.01); A61B 1/00149 (2013.01); A61B 1/0016 (2013.01); A61B 1/0057 (2013.01); A61B 1/018 (2013.01); A61B 34/30 (2016.02); A61B 34/37 (2016.02); A61B 34/71 (2016.02); A61M 25/0009 (2013.01); A61M 25/0012 (2013.01); G16H 40/63 (2018.01); A61B 1/00045 (2013.01); A61B 1/05 (2013.01); A61B 2017/00477 (2013.01); A61B 2017/00526 (2013.01); A61B 2034/2048 (2016.02); A61B 2034/2051 (2016.02); A61B 2034/301 (2016.02); A61B 2034/306 (2016.02); A61B 2034/742 (2016.02); A61B 90/361 (2016.02); Y10T 29/49815 (2015.01)] | 20 Claims |

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1. An elongated endoscopic instrument, comprising:
a working channel;
a lumen including a first section and a second section, the first section being spiraled at a first pitch around the working channel at a distal end of the first section and at a second pitch around the working channel at a proximal end of the first section, the first pitch being different from the second pitch, the second section extending approximately parallel to a neutral axis of the working channel, and the second section having a length that is greater than the first pitch and the second pitch; and
a pull wire slidingly coupled within the lumen and configured to manipulate the instrument.
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