Measurement devices and methods of use thereof

A combination measurement device comprising:

• a processing device,
• a handle;
• a catheter extending from the handle;
• and
• a tip portion disposed at a distal end of the catheter such that the tip portion is positioned opposite of the handle, wherein:
• the tip portion includes a first end portion, an opposite second end portion, and a cavity extending therebetween, the first end portion receives the distal end of the catheter;
• a sensor assembly positioned within the cavity of the tip portion;
• and
• a diaphragm film assembly coupled to the tip portion and communicatively coupled to the sensor assembly, the diaphragm film assembly configured to flexibly move between a plurality of positions based on an applied pressure that displaces the diaphragm film assembly,
• wherein the sensor assembly is configured to measure the applied pressure displacing the diaphragm film assembly and the processing device is configured to determine a concentration of ammonia currently in a fluid at the tip portion.

A method for determining a pressure and a concentration of ammonia within a fluid, the method compromising:

• detecting, with a sensor assembly, an amount of a deflection currently occurring in a diaphragm film assembly positioned at a tip portion of a catheter, the amount of the deflection changes a capacitance measured by the sensor assembly, the diaphragm film assembly is communicatively coupled to the sensor assembly;
• detecting, with a processing device, a change in a resistance of diaphragm film assembly;
• displaying, on a display portion communicatively coupled to the sensor assembly and to the processing device, the amount of the deflection currently occurring and the change in the resistance of diaphragm film assembly,
• wherein the change in the resistance of diaphragm film assembly is indicative of a change in the concentration of ammonia and an amount of deflection currently occurring in the diaphragm film assembly is indicative of the pressure.