Abstract: The disclosure pertains to a method of charging or discharging a capacitive element, such as a piezoelectric crystal. The disclosure also pertains to a device that implements charging of a capacitive element according to said method. The device comprises a bipolar buck-boost converter, whereby a capacitive element can be charged with both positive and negative voltages. The discharge of the capacitive element is provided with energy recovery and feedback to the device's power supply.

Abstract: A device for trimming the thickness of a mechanical body is disclosed. The trimming is performed by screwing a screw through a threaded hole and having the end of the screw pressing against the center of a disk element, which, by deformation, acts as a lever against an adjacent body.

Abstract: The disclosure pertains to a device and a method for compensating for heat expansion effects in solid materials, as well as a method for manufacturing the device.

Abstract: Methods and devices are described for reducing flow resistance in a flow restrictor during high flows.

Abstract: A mechanical amplifier and method for converting a small motion amplitude to a larger motion amplitude are disclosed. The method includes using two or more beams which are connected in series at angles to each other. Undesirable movements arising in the structure are absorbed by the structure through torsion. Each beam is a mechanical motion amplifier, and by connecting these in series, the total amplification is the product of the amplification of the comprised beams. The disclosure also pertains to a device comprising two or more beams connected together at an angle of 90 degrees in one embodiment.

Abstract: A valve for a medical ventilator comprising a hollow flexible body having at least one outwardly bulging area with a curved inner surface. The hollow flexible body further comprises an inwardly protruding abuttable area positioned between two fixed end points. Further the valve comprises a flow channel located inside said hollow flexible body for passage of a fluid between an inlet and an outlet, a valve seat centrally positioned in said flow channel and an annular element circumferentially arranged around said hollow flexible body. The annular element is arranged to be movable in an axial direction along the flow channel by an actuator unit, and whereby said abuttable area is at least partially repositioned and/or reshaped to control a flow of the fluid through the flow channel.

Abstract: A method is described for measuring a flow of gas passing a flow meter device. The device causes a pressure drop when a gas flows through it. The pressure drop across the device is a measure of the gas flow. The device is configured as a gas permeable tube that has a flow channel on the upstream side along the tube configured so as to decrease the cross-section of the channel downstream of the gas permeable tube. This provides for a minimum volume in the channel upstream of the device's pressure-drop-generating component.

Abstract: An arrangement for determining concentration of substances in a fluid comprising a light source for generating primary light pulses within a wavelength interval, a light pulse splitter adapted to split up the primary light pulses into a predetermined number of secondary light pulses to be transmitted through the fluid, the secondary light pulses being separated in time as well as wavelength to be differently absorbed upon passage of the fluid depending on the concentration of the substances, a detector for detecting intensity of the differently absorbed secondary light pulses, and a comparator for comparing the intensities of the differently absorbed secondary light pulses with different reference intensities corresponding to different substances to thereby determine the concentration of the substances in the fluid.

Abstract: Methods and devices are described for reducing flow resistance in a flow restrictor during high flows.

Abstract: Methods and devices are described for reducing flow resistance in a flow restrictor during high flows.

Abstract: A method is described for measuring a flow of gas passing a flow meter device. The device causes a pressure drop when a gas flows through it. The pressure drop across the device is a measure of the gas flow. The device is configured as a gas permeable tube that has a flow channel on the upstream side along the tube configured so as to decrease the cross-section of the channel downstream of the gas permeable tube. This provides for a minimum volume in the channel upstream of the device's pressure-drop-generating component.

Abstract: The disclosure relates to a device for controlling a gas flow, e.g., from a breathing system connected to a patient at exhalation. The flow control is conducted by means of a flexible conduit with flexible circular segments being compressed along the length of the conduit, whereupon the flexible elements are collapsed towards a circular wall. The device comprises autoclavable parts and/or disposable parts, which can be separated from the breathing system without exposing staff handling the system to contaminated surfaces in the breathing system when changing patients.

Abstract: The disclosure pertains to a device and a method for compensating for heat expansion effects in solid materials, as well as a method for manufacturing the device.

Abstract: Methods and devices are described for reducing flow resistance in a flow restrictor during high flows.

Abstract: A device for trimming the thickness of a mechanical body is disclosed. The trimming is performed by screwing a screw through a threaded hole and having the end of the screw pressing against the center of a disk element, which, by deformation, acts as a lever against an adjacent body.

Abstract: A mechanical amplifier and method for converting a small motion amplitude to a larger motion amplitude are disclosed. The method includes using two or more beams which are connected in series at angles to each other. Undesirable movements arising in the structure are absorbed by the structure through torsion. Each beam is a mechanical motion amplifier, and by connecting these in series, the total amplification is the product of the amplification of the comprised beams. The disclosure also pertains to a device comprising two or more beams connected together at an angle of 90 degrees in one embodiment.

Abstract: A system and a method are described for converting a small motion from a piezoelectric actuator to a larger motion in a valve mechanism. A piezoelectric actuator is connected in series to a mechanical amplifier, and, optionally, a mechanical temperature compensation element and a mechanical fine tuning element, all acting in the same effective direction as the piezoelectric actuator.

Abstract: The disclosure relates to a device for controlling the flow of a fluid through a flow channel. The flow is controlled by means of a flexible conduit with flexible circular segments compressed along the length of the conduit, whereupon the flexible elements collapse against a circular wall.

Abstract: The disclosure pertains to a method of charging or discharging a capacitive element, such as a piezoelectric crystal. The disclosure also pertains to a device that implements charging of a capacitive element according to said method. The device comprises a bipolar buck-boost converter, whereby a capacitive element can be charged with both positive and negative voltages. The discharge of the capacitive element is provided with energy recovery and feedback to the device's power supply.

Abstract: A method and device for handling transient pressures and flow processes in a breathing system is disclosed.