Spacer valve and system and method for optimization spacer valve

A pressurized meter dose inhaler comprising:

• an inhaler container comprising a pressurized aerosolized medication and having an exit port to discharge the aerosolized medication;
• a spacer having a first end coupled the exit port, a second end and a body extending between the spacer first end and its second end;
• and
• a valve comprising:
• an inlet nozzle mounted to the second end of the spacer;
• an outlet configured as a mouthpiece to be positioned into user's mouth;
• an elongated tubular body having a wall defining an inner cavity extending between the inlet and the outlet;
• and
• an impact filter positioned in the inner cavity of the valve body and having a diameter larger than a diameter of the inlet nozzle and smaller than a diameter of the outlet,
• wherein during inhalation, a majority of medication large particles are filtered out of a medication flow stream by impacting the impact filter while medication small particles pass to the outlet.

A peak flow meter comprising:

• a valve comprising an inlet nozzle, an outlet configured as a mouthpiece to be positioned into user's mouth and an elongated tubular body having a wall defining an inner cavity extending between the inlet and the outlet;
• a first spring with a predefined spring stiffness is mounted into the inner cavity of the valve body, the spring having a first end facing the inlet nozzle and a second end;
• a second spring having a first end that engages the second end of the first spring and a second end facing the outlet, the second spring having a predefined stiffness that is greater than the stiffness of the first spring;
• an impact body is mounted to the first end of the first spring facing the inlet nozzle and having a diameter larger than a diameter of the inlet nozzle and smaller than a diameter of the outlet;
• and
• a scale coupled to an outer wall of the valve body and calibrated to measure air mass flow rate and quantify expiratory peak flow,
• wherein an exhalation peak flow compresses the first spring to a greater compression rate due to its lower stiffness while the second spring is engaged and minimally compressed due to its greater stiffness compensating for a force of the exhalation peak flow, and wherein a peak flow rate is measured by measuring a distance of the impact body from the valve inlet nozzle.