A system for ventilating lungs of a subject is disclosed herein. The system includes a control unit configured to control operation of the system. The system also includes a machine ventilator circuit configured to assist the breathing functions of the subject, the machine ventilator circuit includes an inspiration delivery unit, and an expiration circuit. The system also includes a manual ventilation circuit comprising a manual bag guiding a gas from the manual bag wherein a gas flow is guided out from the manual bag to assist an inspiration phase, a gas flow is received to fill the manual bag during an expiration phase, and wherein the gas flow received to fill the manual bag during the expiration phase at least partially comprises the gas flow guided to assist the inspiration phase.

A ventilation drive (10) for an anesthesia device and a method for operating such a ventilation drive (10) are provided. The ventilation drive includes a blower unit (12), a pressure chamber (14) and a flexible bag (16) located in the pressure chamber (14). An internal volume of the bag (16) is coupled to an inspiratory branch (20) of a ventilation line. The blower unit (12) can be coupled to the internal volume of an outlet side and to an air inlet (26) for feeding ambient air on an inlet side. Further, a flow sensor (36) is provided between the outlet side of the blower unit (12) and the pressure chamber (14).

A method of controlling a ventilator to provide spontaneous breathing support includes determining a target CO2 value, determining a support pressure, detecting a patient-generated spontaneous breath, and delivering ventilation gas to the patient based on the support pressure. A patient CO2 is then measured, along with measuring at least one of a patient breath rate and a breath volume. The patient CO2 is compared to the target CO2 value. The patient's respiratory drive is determined based on at least one of the patient breath rate and the breath volume. If elevated respiratory drive is detected, then the support pressure is adjusted accordingly. If elevated respiratory drive is not detected, then the target CO2 value is adjusted based on the measured patient CO2.

Embodiments of the present invention provide systems and methods for delivering respiratory treatment to a patient. For example, a treatment system may include a mechanism for delivering a positive pressure breath to a patient, and one or more limb flow control assemblies which modulate gas flow to and from the patient. Exemplary treatment techniques are embodied in anesthesia machines, mechanical ventilators, and manual ventilators.

A stabilizer arm for a BVM resuscitator and method of use is disclosed. The stabilizer arm provides necessary support to the reservoir bag to enable the user to exert downward pressure on the BVM resuscitator while simultaneously squeezing the reservoir bag, and creates force that is focused, directed, and realized at the mask of the assembly. Due to presence of stabilizer arm, this pressure pushes the facial mask downward to assist in forming a tight mask to face seal. The stabilizer arm may be internal, external or integrated into the reservoir bag wall of the BVM resuscitator and may be retro-fitted or original equipment manufactured. The external stabilizer arm may be designed to engage the outlet port neck of the BVM resuscitator with an open collar or a closed collar. The internal stabilizer arm may be configured to fit BVM resuscitators having single piece or multiple piece outlet valve design.

An apparatus and method for resuscitating a patient suffering from cardiac arrest or another condition in which normal circulation has been interrupted. A ventilator is used for delivering a gas mixture to the patient. The ventilator is configured to adjust the partial pressure of CO2 to one or more partial pressures high enough to slow expiration of CO2 from the patient's lungs and thereby maintain a reduced pH in the patient's tissues for a period of time following return of spontaneous circulation.

Provided is a portable artificial respirator, which is manufactured in a compact size without a closing and opening device such as a valve so as to be easily portable, and is configured to internally pressurize the lung and the chest through the trachea and mouth of a human body when an emergency occurs. The portable artificial respirator has a flexible air chamber which is a cylinder-shaped chamber having an opened air passage formed only on the lower part, and has a plurality of folds on the main periphery to be folded and compressed by the pressure applied to the lower part, and restored when the pressure is released to be inflated to the upper part. An expandable outer peripheral structure is formed on the air passage. A mask of a flexible silicone rubber sheet, which closes the rear side of the inside or inner cavity and has a respiration hole which communicates with the air passage formed thereon, is connected thereto.

An anesthesia delivery and ventilation system (ADVS) includes an expiratory section, a circulation flow system (CFS), an inspiratory section, a ventilation drive system (VDS), and an anesthesia delivery system (ADS). The expiratory section receives gases from a patient and the inspiratory section and fresh gases from a fresh gas supply system. An elastic mixing reservoir receives and mixes the gases circulated by the CFS with residual gases via a connector element. The inspiratory section connects to the expiratory section at one end and to a patient connector tube at the other end. The ADS infuses an anesthetic agent into the mixed gases in the inspiratory section. The VDS delivers the mixed gases with the anesthetic agent to the patient. The VDS and the CFS are controlled and operate independently of each other to provide positive end-expiratory pressure control and ventilation control to the patient without use of a proportional valve.

A breathing system for an anesthesia machine is provided, which comprises an operation mode switch, a CO.sub.2 canister, a bellows, a patient inspiratory branch and a patient expiratory branch. The operation mode switch comprises a vent communicating with the patient inspiratory branch, a vent communicating with the patient expiratory branch, a vent communicating with the bellows, and a vent communicating with the CO.sub.2 canister. The CO.sub.2 canister is positioned below the operation mode switch, so as to collect the water flowing through the operation mode switch.

A breathing assistance apparatus includes an inner volumetric member pressurizable from a first pressure to a second pressure and an outer volumetric member surrounding at least a portion of the inner expandable volumetric member. The inner volumetric member pressurizes the outer volumetric member as the inner volumetric member is pressurized from the first pressure to the second pressure. In another embodiment, a breathing assistance apparatus includes exhalation and inhalation chambers with respective biasing members providing for the exhalation chamber to apply a pressure to the inhalation chamber and thereby provide assisted inhalation. Methods for assisting breathing are also provided.