Pressure relief for a catheter balloon device

An inflation device for selectively inflating a balloon of a surgical instrument, the device comprising:

• a syringe including a plunger slidably disposed within a barrel;
• a connector for fluidly connecting an outlet of the syringe with a surgical instrument balloon to establish a closed inflation system between the syringe and an interior of the balloon;
• a mechanical pressure indicator associated with the syringe and for indicating when the inflation system pressure has reached a first predetermined level;
• and
• a relief port for maintaining the inflation system pressure below a second predetermined level, wherein the second predetermined level is higher than the first predetermined level.

An inflation system for dilating a region of a patient's nasal sinus passageways, the system comprising:

• a sinus dilation instrument including a probe configured to deliver a balloon to a paranasal sinus target site;
• and
• an inflation device for inflating the balloon, the inflation device comprising:
• a syringe assembly operable to deliver fluid through an outlet;
• a mechanical pressure indicator associated with the syringe assembly, the mechanical pressure indicator including a housing and an indicator body disposed within the housing, the indicator body configured to transition from a non-alert state to an alert state when a pressure of the inflation system has reached a predetermined level, the indicator body extendable outside of the housing in the alert state;
• a connector including a first inlet and a second inlet, the first inlet for fluidly connecting the outlet with the sinus dilation instrument to establish a closed inflation system between the syringe assembly and an interior of the balloon, the second inlet for connecting the mechanical pressure indicator with the syringe assembly;
• and
• a relief port associated with the mechanical pressure indicator and configured to relieve a pressure of the inflation system when the system exceeds the predetermined level.