A variable throat jet venturi for delivering ventilation gas to a patient includes a jet nozzle, a deformable throat body arranged to receive ventilation gas output by the jet nozzle and defining a gas inlet and a gas outlet, and a housing containing the deformable throat body. The housing may define an entrainment opening which is open to ambient air and a pilot pressure port for pressurizing a plenum between an outer wall of the deformable throat body and an inner wall of the housing. A pilot pressure line may be fluidly coupled to the pilot pressure port. A controller may be programmed to energize the pilot pressure line to constrict the deformable throat body during an exhalation phase of positive end-expiratory pressure (PEEP) therapy.

An apparatus such as a fluid mixer, suitable for use with a respirator, including a venturi nozzle for flow of a pressure-controlled fluid; an ambient fluid aperture in fluid communication with the venturi nozzle; a fluid port; a pressure force multiplier in fluid communication with the fluid port; and a valve moveable relative to the venturi nozzle between a start flow position and a stop flow position; where the pressure force multiplier is configured such that fluid forced into the fluid port actuates the valve relative to the venturi nozzle; and where the pressure force multiplier is configured such that fluid withdrawn from the fluid port actuates the valve relative to the venturi nozzle, further comprising an active filter that comprises an energy harvesting system and at least one filter medium, wherein the energy harvesting system generates electricity to induce a static charge in the at least one filter medium.

A valve for use with a compressed breathable gas source having a valve adapted to: (a) be disposed upstream of a patient delivery device and (b) control at least a portion of a breathable gas source upstream of the patient delivery device and the source including both: (i) a compressed breathable gas source and (ii) a second gas source. The valve includes a first rotatable body. The first rotatable body adjusts, upon rotation thereof a cross-sectional area for gas flow through one or more first apertures from the compressed breathable gas source, second gas source, or both. The valve further includes a gear rotatable simultaneously in response to rotation of the first rotatable body and upon rotation of the gear adjusts a second cross-sectional area for flow through one or more second apertures of gas from the compressed breathable gas source, said second gas source, or both.

An example injector includes a first conduit defining a first flow path including a first choke for a first fluid and a second conduit defining a second flow path including a second choke for a second fluid. The second choke is defined by a converging region upstream and a diverging region downstream of the second choke. The example injector further includes a mixing region after both the diverging region of the second flow path and the first choke and configured to receive the first fluid the second fluid, and an outlet configured to allow the first fluid and the second fluid to exit the mixing region. The first and second chokes are configured to allow a constant mass flow of the first and second fluids, respectively, to flow into the mixing region independent of a pressure at the outlet.

Systems and methods are provided for delivering anesthetic agent to a patient. In one embodiment, an anesthetic vaporizer includes a vaporizing chamber configured to hold a liquid anesthetic agent, and an inductive heating element positioned exterior to the vaporizing chamber and housed within a gas-tight barrier, the inductive heating element operated to selectively heat a target.

The present disclosure pertains to a system configured to amplify the pressure and/or flow rate of a pressurized flow of breathable gas by entraining oxygen gas and/or ambient air with an air amplifier and a venturi valve at or near a blending gas source, distally (e.g., remotely) from an interface appliance of a subject interface (e.g., away from the face of the subject) to reduce noise from the system heard by the subject. The system is configured to provide this pressure support and/or ventilation with oxygen therapy. The system is configured to deliver ventilatory and/or pressure support with oxygen therapy while decreasing output requirements of the blending gas source and/or pressure generator.

Provided herein are negative air pressure devices and uses thereof. In particular, provided herein are negative air pressure devices that modulate CO.sup.2 delivery for use in the treatment of sleep apnea.

An adapter for retrofitting filters to face masks. Filters welded to the mask. A spacer allowing a check valve to operate. A method of providing oxygen and/or a nebulizing treatment to a patient is disclosed. Modifications to a mask may include: adding nose cushion to increase conformance of the mask to facial features; covering breathing ports with viral/bacterial filters; and adding desiccant material to capture moisture accumulation. A face plate fitted over and working in conjunction with a mask which pushes the mask against a user's facial features to assure a better fit. Straps are disposed on the face plate, rather than on the mask. The face plate may provide or comprise: filter protection from user contact, strap locking features, and a nebulizer cutout.

Systems and methods may include a gas source, a gas delivery circuit, and a nasal interface allowing breathing ambient air through the nasal interface. A gas flow path through the nasal interface may have a distal gas flow path opening. A nozzle may be associated with a proximal end of the nasal interface a distance from the distal end gas flow path opening. At least a portion of an entrainment port may be between the nozzle and the distal end gas flow opening. The nozzle may deliver gas into the nasal interface to create a negative pressure area in the gas flow path at the entrainment port. The nasal interface and the nozzle may create a positive pressure area between the entrainment port and the distal end gas flow path opening. Gas from the gas delivery source and air entrained through the entrainment port may increase airway pressure or lung pressure or provide ventilatory support.

A respiratory therapy apparatus includes a rocker mechanism (101, 110, 111, 112) that provides an oscillating resistance to expiration. The apparatus also includes an air entrainment arrangement (200) at its air inlet (3) having a ring orifice (214) connected via a gas inlet (4) to a source (119) of oxygen at elevated pressure. The oxygen emerging around the ring orifice (214) entrains ambient air and supplies this as a continuous flow of respiratory gas to the patient interface (2) to provide a positive airway pressure.