An adaptive gas mixture controller system. A pulse oximeter interface receives pulse oximeter data. A gas blender interface communicates with a separate externally connected gas blender. A processor receives pulse oximeter data via the pulse oximeter interface and outputs data to the gas blender interface for adaptive feedback control of the gas mixture based upon the SpO.sub.2 level signals from the pulse oximeter interface. When the processor receives data from the gas blender indicating that the gas mixture has been manually changed, enters a manual override mode and halts sending adaptive feedback control signals to the gas blender. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

There is provided a humidifier for a respiratory therapy system that includes a humidification chamber having an inner wall spaced from an outer wall to form a wall cavity between the inner and outer walls. A gas flow path is located within the wall cavity. Gas, such as air, flows along the gas flow path from an inlet to the humidification chamber to an outlet of the humidification chamber. Optionally, the gas flow path may follow a helical route through the wall cavity.

Various venting attachments or leak devices can be removably or permanently coupled to a surgical cannula to allow a user to vent gases, in particular smoke, from a surgical cavity. The venting attachment can be configured to vent the smoke at a predetermined rate and filter out the smoke prior to venting to atmosphere. The substantially constant venting flow rate can promote clearing of the smoke in the surgical cavity while helping to maintain a substantially constant pressure, and thus stability, in the surgical cavity.

A method for controlling gas composition in a surgical cavity during an endoscopic surgical procedure includes monitoring for a plurality of gas species in a gas flow from a surgical cavity of a patient. The method includes measuring the plurality of gas species in the gas flow from the surgical cavity and determining if the gas species measured in the gas flow from the surgical cavity are each present and/or within a respective desired range. The method includes adding gas into the surgical cavity if one or more gas species in the plurality of gas species is outside of the respective desired range so as to bring a composition of gas species in the surgical cavity within the respective desired range.

A continuous positive airway pressure system comprises an inspiratory portion, an expiratory portion, and a controller. The inspiratory portion is coupled to a patient interface to provide an airflow with positive pressure to a patient. The inspiratory portion includes a first sensor to measure a pressure and/or a flow rate of the airflow at the inspiratory portion. The expiratory portion is coupled to the patient interface to receive air exhaled from the patient. The expiratory portion includes a second sensor for measuring a pressure and/or a flow rate of the air exhaled at the expiratory portion. The controller (i) determines a pressure at the patient interface based on the measured pressures and/or the flow rates of the airflow at the inspiratory portion and the air exhaled at the expiratory portion and (ii) modifies the airflow provided by the inspiratory portion based on the determined pressure.

A ventilator with a respiratory gas unit, and with a humidifier which comprises a heating element and a water container and is designed for coupling to the ventilator, comprising: at least one sensor which detects one or more parameters of the respiratory gas, at least one control unit for adjusting the heating power of the heating element at least partially on the basis of the parameter of the respiratory gas.

The invention discloses a multi-tube body adapter which is connected to a plurality of outer tubes for application to a digestive system and a respiratory system of a human body. The multi-tube body adapter includes a housing to form an accommodating space of the multi-chamber. The plurality of chambers is not in communication with each other. One end of the plurality of chambers respectively provides a connection port and the other end of the plurality of chambers is commonly connected to an extension having a plurality of openings. By connecting with the chamber, the connection port and the opening, a supply path for separately providing the supply path of the respiratory system and the digestive system can be formed.

A virus attenuator includes: a housing defining an interior and having at least one intake port fluidly coupled to the interior and a gas ejection nozzle fluidly coupled to the interior, the gas ejection nozzle being configured to couple to a mask; and at least one heater disposed in the interior between the at least one intake port and the gas ejection nozzle such that at least some gas brought into the interior through the at least one gas intake port contacts the at least one heater. The at least one heater is configured to heat contacting gas to a virus attenuating temperature before the contacting gas exits the interior through the gas ejection nozzle.

A flow generator includes a blower, a flow generator outlet configured to receive an end of a gas delivery tube, and a controller. The flow generator outlet includes electrical connectors configured to contact corresponding electrical connectors associated with the breathable gas delivery tube when the breathable gas delivery tube is received by the flow generator outlet. The controller includes a tube-type detect circuit and is configured to receive signals from the breathable gas delivery tube by way of the electrical connectors of the flow generator outlet. The tube-type detect circuit is configured so that when the breathable gas delivery tube is received by the flow generator outlet, the tube-type detect circuit determines the type of breathable gas delivery tube based on signals from the electrical connectors of the flow generator outlet that are indicative of a condition of a resistor associated with the breathable gas delivery tube.

A respiratory assistance system including a humidification apparatus used for delivery of heated and humidified gases to a patient includes a humidification chamber with an associated heater and sensor, an inspiratory conduit with an associated heater and sensor, and an unheated patient interface, such as a face mask. A controller of the humidification apparatus is configured to determine a gas source and change the set point accordingly to maintain patient comfort regardless of the humidity level of the gas source.