Oxygen accumulator for constant partial pressure semi-closed bre

Details Oxygen accumulator for constant partial pressure semi-closed bre Oxygen accumulator for constant partial pressure semi-closed bre

1982-01-26

1984-06-19

Kamm, William E.

Surgery

Respiratory method or device

Including body or head supported means covering user's scalp

12820422, A61M 1600

Patent

active

044548788

ABSTRACT:
The invention relates to improvements in a diver's semi-closed circuit breathing apparatus and is intended to better control the partial pressure of oxygen during descent and ascent. Such apparatus includes a counterlung, sources of oxygen and inert gas, an oxygen regulator, a mass flow jet in the oxygen circuit, a regulator for the inert gas, and a feed-back controlled laminar flow element for feeding a mixture of the oxygen and inert gas to a counterlung of the breathing apparatus. The improvement comprises the provision of an oxygen accumulator in the oxygen circuit following the mass flow jet so that a portion of the delivered oyxgen is diverted thereto during descent to counteract oxygen partial pressure overshoot. At constant depth the apparatus operates normally, maintaining appropriate oxygen partial pressure, and, during ascent, oxygen is returned from the accumulator to the breathing apparatus to counteract any drop in oxygen partial pressure.

REFERENCES:
patent: 3820537 (1974-06-01), Almqvist et al.
patent: 3859994 (1975-11-01), Almqvist et al.
patent: 3924618 (1975-12-01), Banjavich et al.
patent: 4037594 (1977-07-01), Riegel et al.
patent: 4362154 (1982-12-01), Le Masson

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