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.

The present invention relates to a catheter for ventilating a patient, with a ventilation channel for alternately delivering and removing air and/or oxygen to and from the patient's airways, the catheter having a maximum external diameter of at most 6 mm, preferably 2 to 5 mm, and the ventilation channel having an open end, and a connector end for connection to a gas flow reversing element. According to the invention, the catheter is provided with means or elements for measuring the pressure outside the ventilation channel near the open end. The catheter preferably has a pressure measurement channel, with an open measurement end near the open end of the ventilation channel, and a measurement connector piece for connecting a pressure display device. Of particular advantage is a catheter with an expansion body (cuff) that is fluidically connected to a supply channel through which the expansion body can be increased or reduced in size by means of a fluid. The jet ventilation catheter according to the invention permits a novel ventilation principle that can be regarded as a bridge between classical jet ventilation and conventional controlled ventilation and that opens up possibilities for new and improved interventions in the airways.

A breathing assistance system is provided for delivering a stream flow of heated, humidified gases to a user. The system includes a humidifier unit which holds and heats a volume of water, and which in use receives a flow of gases from a gases source via an inlet port. The flow of gases passes through the humidifier and exits via an exit port. The system further includes a temperature sensor which measures the temperature of the gases exiting the humidifier unit, an ambient temperature sensor which measures the temperature of gases before they enter the humidifier unit, and a flow sensor which measures the flow rate of the gases stream. The system also includes a controller which receives data from the temperature and flow sensors, and which determines a control output in response. The control output is configured to adjust the power to the humidifier unit to achieve a desired output at the humidifier unit exit port.

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 pump unit includes a micro pump and an assist mechanism. The micro pump includes: a housing having an inflow port and an outflow port; and a pump device built in the housing, the pump device transporting a fluid from the inflow port to the outflow port. The assist mechanism includes a jet nozzle for jetting a fluid. A jet port is opened at a tip portion of the jet nozzle. The assist mechanism is disposed in such a manner that a gap through which a fluid outside can flow is formed between the tip portion and the housing. The jet port is located in proximity to the inflow port. The jet port directly faces the inflow port.

An air delivery system includes an air flow generator to provide a pressurized flow of air, a patient interface to provide a seal with the patient's face in use, an air delivery conduit to interconnect the air flow generator and the patient interface, and a controllable vent valve to control venting from the patient interface. The vent valve is controlled to maintain a substantially constant air flow in the air delivery conduit and the air flow generator.

The present invention relates to an arrangement (1) comprising a switchable connection (2) and a gas flow reversing element (3), e.g. according to WO 2008/113752 A1, which is suitable for using a gas supply (4), in particular oxygen, which is at excess pressure in order to selectively generate a gas stream (5) from or to a line connection (6) which can be connected, in particular via a lumen (7), to an airway of a patient (8); wherein the switchable connection (2) is arranged at the branching piece (10) or at the line connection (6) and switchably connects at least one second line (15) to the first line (13), wherein the switchable connection (2) has at least two switching positions (16, 17), wherein (1) in the first switching position (16) the first line (13) is open and the second line (15) is closed, such that the gas flow (5) through the connection (2) can flow in both directions along the first line (13); (2) in the second switching position (17), if the switchable connection (2) is arranged at the branching piece (10), the second line (15) is fluidically connected, via the connection (2), to the line connection (6) and in particular to the lumen (7) or, if the switchable connection (2) is arranged at the line connection (6), the second line (15) is connected to the lumen (7).

A leakage gas valve 15 ventilation apparatus comprising a first valve body 16 having a main gas path chamber 17 for guiding an inhalation gas to a patient, comprising at least first, second and third chamber sections 18, 19, 20, an inlet duct 21 for supplying the ventilation gas to the first chamber section 18, an outlet duct 22 for releasing the ventilation gas from the third chamber section 20. The first chamber section 18 and third chamber section 20 comprise a first cross-section area (A1) and the second chamber section 19 comprises a second cross-section area (A2). The second cross-section area (A2) is smaller than the first cross-section area (A1), and the second chamber section 19 comprises a leakage channel 25 for allowing a leakage gas flow out of the gas valve 15 during exhalation. Additionally, circuits with a ventilation limb comprising a gas valve.

A ventilatory assist system and method are disclosed. The system comprises a tube for connection to a patient's airway, inspiratory and expiratory tube lumens connected to the tube, an inspiratory air source connected to the inspiration tube lumen, and a controller of air pressure in the expiratory tube lumen. The pressure controller is responsive to a physiological breathing signal representative of patient's inspiratory effort to allow air flow through the expiratory tube lumen during a patient's expiration phase, partially restricting the air flow through the expiratory tube lumen to a so minimum air flow during a patient's inspiration phase. During both respiratory phases, a unidirectional air flow is produced through the inspiratory and expiratory tube lumens to prevent air expired by the patient from being breathed again. The physiological breathing signal allows synchronization of the ventilatory assist with breathing efforts of the patient.

Medical techniques include systems and methods for administering a positive pressure ventilation, a positive end expiratory pressure, and a vacuum to a person. Approaches also include treating a person with an intrathoracic pressure regulator so as to modulate or upregulate the autonomic system of the person, and treating a person with a combination of an intrathoracic pressure regulation treatment and an intra-aortic balloon pump treatment.