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This invention includes a pair of chambers each containing a piston which is reciprocated slowly by a computer controlled reversible fluid pressure pump between an advanced position for moving room air through a molecular sieve bed to strip nitrogen from the air and deliver oxygen enriched air to a

This invention includes a pair of chambers each containing a piston which is reciprocated slowly by a computer controlled reversible fluid pressure pump between an advanced position for moving room air through a molecular sieve bed to strip nitrogen from the air and deliver oxygen enriched air to a patient, and a retracted position to back-flush the sieve bed with oxygen enriched air and exhaust the nitrogen rich air to the atmosphere. The pistons may be moved by piston rods or by a rack and pinion drive. In a third embodiment a single cylinder forms a pair of chambers separated by a central exhaust chamber, and expandable bellows in the chambers extend and retract either alternatively or simultaneously. In a fourth embodiment a single cylinder containing a single piston forms a pair of chambers one on each side of the piston and a molecular sieve bed communicates with each chamber.

대표청구항 ▼

This invention includes a pair of chambers each containing a piston which is reciprocated slowly by a computer controlled reversible fluid pressure pump between an advanced position for moving room air through a molecular sieve bed to strip nitrogen from the air and deliver oxygen enriched air to a

This invention includes a pair of chambers each containing a piston which is reciprocated slowly by a computer controlled reversible fluid pressure pump between an advanced position for moving room air through a molecular sieve bed to strip nitrogen from the air and deliver oxygen enriched air to a patient, and a retracted position to back-flush the sieve bed with oxygen enriched air and exhaust the nitrogen rich air to the atmosphere. The pistons may be moved by piston rods or by a rack and pinion drive. In a third embodiment a single cylinder forms a pair of chambers separated by a central exhaust chamber, and expandable bellows in the chambers extend and retract either alternatively or simultaneously. In a fourth embodiment a single cylinder containing a single piston forms a pair of chambers one on each side of the piston and a molecular sieve bed communicates with each chamber. g strips urging said proximal ends apart, such that removal of the outer sleeve causes said spring automatically to effect said axial movement in said opposite direction to expand said inner supporting surface and thereby the annular device supported thereon.11. The delivery appliance according to claim 1, wherein said annular array of supporting strips is constituted of a tubular member of elastic material formed with a plurality of longitudinally-extending circumferentially-spaced slits terminating short of the opposite ends of the tubular member, such that the slitted tubular member defines said annular array of supporting strips, and said opposite ends of the