There is provided a method of controlling a powered air purifying respirator blower system to deliver a substantially uniform volumetric airflow to a user, the system comprising a fan powered by a battery in communication with a variable speed electric motor, the variable speed electric motor is controlled by an electronic control unit for delivering a forced flow of air through at least one filter to a user, comprising the steps of: (a) determining an estimated system run time by summing a battery run time remaining and a system run time; and (b) altering a speed of the variable speed electric motor when the estimated system run time is equal to or less than a desired system run time.

There is provided a method of controlling a powered air purifying respirator blower system to deliver a substantially uniform volumetric airflow to a user, the system comprising a fan powered by a battery in communication with a variable speed electric motor, the variable speed electric motor is controlled by an electronic control unit for delivering a forced flow of air through at least one filter to a user, comprising the steps of: (a) determining an estimated system run time by summing a battery run time remaining and a system run time; and (b) altering a speed of the variable speed electric motor when the estimated system run time is equal to or less than a desired system run time.

Nasal cannula apparatus, includes in an inlet tubular fitting sized and configured to directly endwise connect to a source of oxygen, or oxygen and air. The fitting defines an inlet flow passage area A, having a 15 mm external diameter. A pair of tubular prongs is operatively connected with the inlet fitting, and receivable in an infant's nostrils to deliver oxygen, or oxygen and air flow to the infant, the prongs each having flow passing area A.sub.3, and A.sub.1>>A.sub.3.

A ventilation gas cooling apparatus is configured in a modular form adapted for selective removable engagement to a ventilator. The apparatus includes a gas inlet port, a gas delivery port, a pressure sensing port, and a thermoelectric cooler. The inlet port is fluidly connectible to a source of therapeutic breathing gas at an external end and is fluidly connectible to an inlet of the ventilator at an internal end. The delivery port is fluidly connectible to a patient circuit at an external end and is fluidly connectable to an outlet of the ventilator at an internal end. The pressure sensing port is fluidly connectible to both a pressure sensing port of the ventilator and to the patient circuit. The apparatus may further include a cooling fluid system operative to circulate either a gas or liquid coolant along at least a portion of a multi-lumen tube integrated into the patient circuit.

The present invention discloses ventilation apparatus, comprising a casing with a first vent and a second vent, a fixed spacer disposed within the casing, and a movable spacer in operative connection with a power mechanism. Also discloses herein are methods for ventilating a subject, by synchronously providing a positive pressure ventilation and a negative pressure ventilation using the ventilation apparatus described herein.

A device and a method for creating and/or maintaining an obstruction free upper respiratory passages. The device is configured to fit under the chin of a subject adjacent to the subject's neck at an external location corresponding approximately with the subject's internal soft tissue associated with the neck's anterior triangle. The device is capable of exerting negative pressure on the surface of a subject's neck, displacing the soft tissue forward and enlarging the airway.

The invention allows users to be totally submerged underwater with an adequate supply of air for extended periods of time without the use of regulators, pressure vessels, diaphragm pumps or compressors, internal combustion engines or external power sources. The apparatus includes a buoyant enclosure supporting a hollow air intake pipe with a sphere shaped screen mounted on the top. The bottom half of the screen has holes to allow air into an air intake tube and to drain water out. A low pressure blower and filter assembly with a rechargeable and easily replaceable lithium-ion battery are mounted inside the buoyant enclosure. Air is drawn into the low pressure blower suction and through an air filter delivering constant air flow to the individual through an attached flexible air supply hose. Three check valves constrain air flow supply unidirectional to the individual while venting excess air. A hand pump vacates water from the mouthpiece or mask and draws in purging air while the individual is submerged. For stability the apparatus has a low center of gravity creating a strong self-righting moment in calm or rough seas. For safety the apparatus has a grab handle and a tether line connection from the bottom of the buoyant enclosure.

A system is provided for a firefighter or other emergency worker and includes a protective coat and a self-contained breathing apparatus. The self-contained breathing apparatus includes a regulator connected by a high-pressure hose to a gas tank that is releasibly carried on the coat by shoulder straps and waist straps.

A system is provided for a firefighter or other emergency worker and includes a protective coat and a self-contained breathing apparatus. The self-contained breathing apparatus includes a regulator connected by a high-pressure hose to a gas tank that is releasibly carried on the coat by shoulder straps and waist straps.

Swim cap comprising a respirator, ear pockets housing headphones, a communication system comprising a microphone integrated in a mouthpiece and a Bluetooth system for enabling voice communication while swimming and avoiding turning the head to lift it out of the water to breathe.