System and method for anesthetizing eustachian tube

A method of treating a Eustachian tube (ET) of a patient using a guide member and a tubular member, wherein one or both of the guide member and tubular member comprises a stop member configured to limit a restrict advancement of the tubular member relative to the guide member, wherein the method comprises:

• (a) directing the guide member into an oro-nasal cavity of the patient;
• (b) directing the tubular catheter into the oro-nasal cavity of the patient;
• (c) advancing at least part of a distal portion of the guide member adjacent to or into an opening of the ET;
• (d) advancing the tubular member relative to the guide member such that a distal end of the tubular member is positioned coincident with at least a portion of the ET;
• and
• (e) directing a fluid through the tubular member and out of the tubular member and onto at least a portion of the ET.

A method of treating a Eustachian tube (ET) of a patient using a guide member and a dilation catheter, wherein the method comprises:

• (a) directing the guide member into an oro-nasal cavity of the patient;
• (b) directing the dilation catheter into the oro-nasal cavity of the patient;
• (c) advancing at least part of a distal portion of the guide member into an opening of the ET;
• (d) advancing the dilation catheter relative to the guide member such that an expandable element of the dilation catheter is positioned distal to a distal end of the guide member;
• (e) expanding the expandable element to thereby dilate the ET;
• (f) venting the anatomical structures that are positioned distal to the expandable element;
• and
• (g) delivering a fluid to the ET.