Embodiments of the present invention relate to a magnetic damper that can be used in a one-way valve of an anesthesia respirator, the magnetic damper including: a sealing element, capable of moving between a first position and a second position, wherein the one-way valve is opened when the sealing element is in the first position, and the one-way valve is closed when the sealing element is in the second position; a magnet, connected to the sealing element and used for driving the sealing element to move between the first position and the second position; and a coil, capable of inducing a current by means of movement of the magnet, wherein the current can produce a damping effect on the movement of the magnet. The embodiments of the present invention further relate to a one-way valve and an anesthesia respirator including the magnetic damper.

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 ventilator system is presented. The ventilator system includes a controller configured to generate a first control signal for a first time-period and a second control signal for a second time-period during an inspiration time. Also, the ventilator system includes a rotary pump configured to change one of a pressure and a flow rate of the drive gas to a first value if the first control signal is received and change the one of the pressure and the flow rate of the drive gas to a second value if the second control signal is received. Further, the rotary pump is configured to deliver the drive gas to cause supply of a medical gas during the inspiration time, wherein the medical gas is supplied based on the one of the pressure and the flow rate of the drive gas delivered from the rotary pump.

An anesthesia machine includes a gas mixer providing gas for delivery to a ventilated patient and a breathing system. The breathing system includes a reusable ventilation portion and a disposable circle portion. The reusable ventilation portion includes a mechanical ventilation section, a manual ventilation section, a ventilation port, and switch configured to switch between connection of the mechanical ventilation section and the manual ventilation section to drive patient ventilation. The disposable circle portion includes a vent connector that connects to the ventilation port, an inspiratory channel, and a gas intake port providing anesthetic gas from the gas mixer to the inspiratory channel. The disposable circle portion further includes an expiratory channel, a CO.sub.2 absorber, and a filter positioned in a flow path between the expiratory port and the vent connector and between the CO.sub.2 absorber and the vent connector. The filter is configured to prevent moisture and bacteria from entering the reusable ventilation portion of the breathing system.

A patient ventilator system includes a patient delivery circuit having an inspiratory section that delivers an inspiratory gas flow to a patient and an expiratory section that receives expiratory gas flow from the patient, wherein a bidirectional blower motor drives the inspiratory gas flow in the inspiratory section and controls the expiratory gas flow in the expiratory section. A flow sensor measures gas flow rate between the bidirectional blower motor and the patient delivery circuit. A four quadrant controller is configured to control speed and direction of the bi-directional blower motor based on the measured flow rate so as to effectuate ventilation for the patient.

A system for controlling patient sedation and spontaneous breathing intensity includes a ventilator system that delivers ventilation to the patient. The system further includes a spontaneous breathing control module configured to determine a first spontaneous breathing intensity at a first sedative status of the patient, and a second spontaneous breathing intensity at a second sedative status of the patient. A sedation/breathing relationship is then defined between spontaneous breathing intensity and sedative status for the patient based on the first and second sedative statuses and the first and second spontaneous breathing intensities. The spontaneous breathing control module then receives a desired spontaneous breathing intensity for the patient and determines a desired sedative status that achieves that desired spontaneous breathing intensity based on the sedation/breathing relationship.

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.

The present invention is a mechanical ventilation device which delivers intermittent positive pressure ventilation by compressing AMBU. As the device uses existing AMBU for the ventilation, it is intended to automate the process of hand ventilation and will hence keep the costs and skill requirement low. Due to usage of the AMBU and simple mechanics, it is easy to manufacture and maintain the device.

The disclosure provides a way to supplement the tidal volume delivered to the patient by a leaking re-breather when the delivered volume becomes less than that set by the ventilator (in either pressure-regulated or volume modes). This may be accomplished with a shunta gas conduit joining the non-patient side of the re-breather to the patient side. A low-resistance, plenum or a draw-over vaporizer may also be incorporated into the gas pathway. Such a device may include a housing with a movable partition separating an actuating side from a patient side. The housing includes a ventilator orifice for pneumatic communication between a ventilator and the actuating side and a patient orifice for pneumatic communication between the patient side and a patient. A shunt defines a bypass flow path from the actuating side and to the patient side when the moveable partition is at a maximal displacement towards the patient side.

A manual patient ventilation system includes a breathing bag manually compressed by a clinician to ventilate a patient via a patient interface device, a gas supply system supplying fresh gas to the breathing bag at a fresh gas flow rate, a pressure sensor measuring a patient airway pressure (PAW) throughout a compression and release cycle of the breathing bag by the clinician, a fresh gas controller comprising a processor, and a manual ventilation control module executable on the processor by the fresh gas controller. The manual ventilation control module includes instructions executable to receive the Paw measurements and determine a fresh gas flow rate based thereon. The gas supply system is then controlled to supply the fresh gas flow rate into the breathing circuit.