Portable Oxygen Concentrator

Theory and Method

The ToronPOC™ FDA 1000P portable oxygen concentrator generates medical-grade oxygen using pressure swing adsorption (PSA), the same separation principle applied in stationary home oxygen concentrators. Ambient room air contains roughly 78% nitrogen and 21% oxygen; the PSA cycle isolates the oxygen fraction and vents the nitrogen back to the surrounding air.

Inside the device, a miniature oil-less compressor pressurizes filtered ambient air and feeds it through a pair of compact zeolite molecular sieve beds. The zeolite preferentially adsorbs nitrogen at elevated pressure, allowing oxygen-enriched gas to pass through to a small product reservoir. The two sieve beds alternate between adsorption and regeneration, producing a continuous source of 93% (±3%) oxygen.

Pulse dose delivery monitors the patient's breathing through a pressure-sensing nasal cannula and triggers a metered oxygen bolus at the start of each inhalation. The portable oxygen concentrator delivers oxygen only during the inspiratory phase, conserving energy and extending battery runtime compared to constant-flow operation.

Five pulse dose settings scale the bolus volume to approximate continuous flow rates from 1 L/min through 5 L/min equivalent. A second configuration supports continuous flow at 1–5 L/min for users whose prescription requires constant delivery, with the dual-mode variant covering both pulse and 1 L/min continuous output.

The integrated lithium-ion battery powers the compressor, valve manifold, and onboard electronics. The standard 8-cell battery handles routine outings, while the optional 12-cell battery extends runtime to roughly 7 hours per charge, depending on flow setting and breathing pattern. AC and 12 V DC chargers allow the unit to recharge from wall outlets or vehicle accessory ports.

Operating Method Steps

• Battery Installation — Slide the lithium-ion battery into the rear compartment until it clicks into place. Confirm the battery indicator shows sufficient charge for the planned outing, or connect the AC or DC charger to power the unit directly.
• Cannula Connection — Attach a single-lumen pulse-dose nasal cannula to the front oxygen outlet. The cannula provides both the oxygen path and the breath-detection pressure signal that triggers each pulse.
• Power-On and Self-Test — Press the power button. The portable oxygen concentrator runs an internal self-test, then begins delivering oxygen at the last-used flow setting.
• Flow Setting Selection — Select pulse dose setting 1 through 5 to match the prescribed equivalent flow rate. Dual-mode variants also offer continuous flow at 1–5 L/min through the mode selector.
• Active Use — Carry the unit using the included shoulder or backpack bag. Breathe normally through the cannula; the device detects each inhalation and delivers a metered oxygen bolus at the start of the breath.
• Battery Swap or Recharge — Swap to a charged battery for extended outings, or connect the AC charger at home and the 12 V DC car charger in vehicles to keep the device running indefinitely.
• Sieve Bed Service — Remove the molecular sieve bed cartridge per the maintenance schedule in the user manual. Field-replaceable sieve beds keep the unit serviceable without sending the entire device for repair.