163 results about "Fluid volume" patented technology

The approach presented here relates to a determination appliance (100) for determining a viscosity of a fluid. The determination appliance (100) has at least one determination device (110) and a provisioning device (115). The determination device (110) is designed to determine the viscosity of the fluid and / or a rotational speed (ω) of a blade wheel (205) for conveying the fluid by using at least one detected volume flow of the fluid and a detected pressure difference of the fluid. The provisioning device (115) is designed to provide or send a viscosity signal (130) representing the viscosity determined by the determination device (110).

The invention relates to a method for determining at least a flow velocity or a fluid volume flow (5) of a fluid flowing through an implanted vascular support system (1), comprising the following steps: a) carrying out a pulsed Doppler measurement by means of an ultrasonic sensor (2) of the support system (1), b) evaluating a measurement result from step a), which has a possible ambiguity, c) providing at least one operating parameter of a flow machine (3) of the support system (1), d) determining at least the flow velocity or the fluid volume flow (5) using the measurement result evaluated in step b), wherein the possible ambiguity of the measurement result is corrected using the operating parameter.

The invention relates to a method for determining a total fluid volume flow (1) in the region of an implanted vascular support system (2), comprising the following steps: a) determining a reference temperature (3) of the fluid, b) determining a motor temperature (4) of an electric motor (5) of the support system (2), c) determining the thermal dissipation loss (6) of the electric motor (5), d) ascertaining the total fluid volume flow (1) using the reference temperature (3), the motor temperature (4), and the thermal dissipation loss (6) of the electric motor (5).

A dynamic pressure response drainage system including control logic configured to enable measuring of residual fluid disposed within the drainage lumen. The residual fluid volume is measured by detecting the magnitude of the dynamic pressure response in the system containing the residual fluid when a sudden displacement (e.g. increase or decrease) of air volume occurs inside the system. The pressure burst magnitude is related to the pressure needed to move the mass of fluid, thus the fluid volume can be calculated from measurements of the burst pressure. The magnitude of the measured air pressure exhibits a dynamic pressure response corresponding to the mass of fluid in the tube. Either positive or negative pressure bursts can be used to produce and measure the corresponding positive or negative dynamic response spike pressure.

The invention relates to a method for determining at least a flow velocity or a fluid volume flow of a fluid flowing through an implanted vascular support system, comprising the following steps: a) carrying out a pulsed Doppler measurement by means of an ultrasonic sensor of the support system, b) evaluating a measurement result from step a), which has a possible ambiguity, c) providing at least one operating parameter of a flow machine of the support system, d) determining at least the flow velocity or the fluid volume flow using the measurement result evaluated in step b), wherein the possible ambiguity of the measurement result is corrected using the operating parameter.

A medical treatment system, such as peritoneal dialysis system, may include control and other features to enhance patient comfort and ease of use. For example, a peritoneal dialysis system may include a control system that can adjust the volume of fluid infused into the peritoneal cavity to prevent the intraperitoneal fluid volume from exceeding a pre-determined amount. The control system can adjust by adding one or more therapy cycles, allowing for fill volumes during each cycle to be reduced. The control system may continue to allow the fluid to drain from the peritoneal cavity as completely as possible before starting the next therapy cycle. The control system may also adjust the dwell time of fluid within the peritoneal cavity during therapy cycles in order to complete a therapy within a scheduled time period. The cycler may also be configured to have a heater control system that monitors both the temperature of a heating tray and the temperature of a bag of dialysis fluid in order to bring the temperature of the dialysis fluid rapidly to a specified temperature, with minimal temperature overshoot.

Systems and methods for the transfer of medical fluid are provided. A medical fluid transfer system may comprise a pump configured to transfer fluid through a tube assembly having a first connector configured to couple to a source container and a second connector configured to couple to a target container. The medical fluid transfer system may also comprise a destination sensor configured to output information about the target container. The medical fluid transfer system may further comprise a control system configured to operate the pump based on an operational setting associated with fluid volume; receive measurement data representing a measurement of the target container by the destination sensor, and adjust the operational setting based on an observed volume of fluid transferred to the target container.

A medical treatment system, such as a peritoneal dialysis system, may include control and other features to enhance patient comfort and ease of use. For example, the peritoneal dialysis system may include a control system that can adjust a volume of fluid infused into a peritoneal cavity to prevent intraperitoneal fluid volume from exceeding a pre-determined amount. The control system can adjust by adding one or more therapy cycles, allowing for fill volumes during each cycle of the one or more therapy cycles to be reduced. The control system may continue to allow the fluid to drain from the peritoneal cavity as completely as possible before starting a next therapy cycle of the one or more therapy cycles. The control system may also adjust a dwell time of the fluid within the peritoneal cavity during the one or more therapy cycles in order to complete a therapy within a scheduled time period. A cycler may also be configured to have a heater control system that monitors both a temperature of a heating tray and a temperature of a bag of dialysis fluid in order to bring a temperature of the dialysis fluid rapidly to a specified temperature, with minimal temperature overshoot.

A system for measuring changes in a fluid stored within a container is disclosed. The system may include a radio-frequency sensing element disposed externally on the container and configured to generate a signal indicative of at least one dielectric property of the fluid, wherein the fluid undergoes composition-based or environment-driven changes due to interactions with the container. In some aspects, a processing component generates an output representative of at least one time-varying fluid characteristic. In some aspects, the container is a wooden barrel with an interior surface adapted to impart flavor or chemical changes to the fluid. In some aspects, the fluid is a beverage including at least one of wine, beer, and distilled spirits, with the time-varying characteristic including a fermentation parameter that changes over time. In some aspects, the at least one time-varying fluid characteristic of the fluid includes at least one of fluid level or fluid volume.

The invention discloses a gas-liquid low-temperature two-phase flow precise monitoring and metering test system, which comprises a segmented sensing acquisition module, a high-speed signal analysis module, a pulsation resonance identification module, an active damping control module, a phase change intelligent identification module and a monitoring metering output module, a plurality of groups of separated fluid dynamic response sensors are arranged in a low-temperature two-phase flow pipeline and are respectively positioned at a two-phase mixing inlet section, a middle stable section and an outlet section, so that segmented data acquisition is realized. The method has the advantages that the resonance risk caused by gas-liquid phase change can be accurately identified, a damping structure is regulated and controlled in real time, and system resonance and sensor damage are effectively avoided; meanwhile, through multi-point flow velocity fusion and gas phase molar fraction dynamic correction, high-precision measurement of the two-phase fluid volume flow is achieved, the measurement stability and the system safety are improved, and the device is widely suitable for low-temperature gas-liquid mixed transportation scenes.

Improvements in fluid volume measurement systems are disclosed for a pneumatically actuated diaphragm pump in general, and a peritoneal dialysis cycler using a pump cassette in particular. Pump fluid volume measurements are based on pressure measurements in a pump control chamber and a reference chamber in a two-chamber model, with different sections being modeled using a combination of adiabatic, isothermal and polytropic processes. Real time or instantaneous fluid flow measurements in a pump chamber of the diaphragm pump are also disclosed, in this case using a one-chamber ideal gas model and using a high speed processor to obtain and process pump control chamber pressures during fluid flow into or out of the pump chamber. Improved heater control circuitry is also disclosed, to provide added or redundant safety measures, or to reduce current leakage from a heater element during pulse width modulation control of the heater element. Improvements are also disclosed in an application of negative pressure during a drain phase in peritoneal dialysis therapy, and to control an amount of intraperitoneal fluid accumulation during the therapy. Improvements in efficiency are also disclosed in movement of fluid into and out of a two-pump cassette and a heater bag of the peritoneal dialysis cycler, and in synchronization of operation of two or more pumps in the peritoneal dialysis cycler or other fluid handling devices using a multi-pump arrangement.

The invention relates to a method for determining a total fluid volume flow (1) in the region of an implanted vascular support system (2), comprising the following steps: a) determining a reference temperature (3) of the fluid, b) determining a motor temperature (4) of an electric motor (5) of the support system (2), c) determining the thermal dissipation loss (6) of the electric motor (5), d) ascertaining the total fluid volume flow (1) using the reference temperature (3), the motor temperature (4), and the thermal dissipation loss (6) of the electric motor (5).

Some embodiments disclosed herein relate to a device for transferring precise amounts of fluid from at least one source container to at least one target container. In some embodiments, the fluid is first transferred from the source container (e.g., a vial) through a connector to an intermediate measuring container (e.g., a syringe). In some embodiments air can pass through an air inlet and enter the vial to compensate for the volume of fluid withdrawn from the vial. An air check valve or a bag or a filter can prevent the fluid from escaping through the air inlet. The precisely measured amount of fluid can then be transferred from the intermediate measuring container to the target container (e.g., an IV bag). In some embodiments the connector can include a source check valve and a target check valve to direct fluid first from the source container to the intermediate measuring container and then from the intermediate measuring container to the target container. Some embodiments of the device can include a motor and a controller for automatically actuating a plunger of the syringe to transfer the desired amount of fluid.

The invention relates to a method for determining a fluid volume flow (1) through an implanted vascular support system (2), comprising the following steps: a) determining a fluid temperature parameter in the region of a cannula (4) of the support system (2), b) operating a heating element (5) which can bring about a change in a fluid temperature in the cannula (4), c) determining the fluid volume flow (1) using at least the fluid temperature parameter or the change thereof and at least one heating element operating parameter or the change thereof. The invention also relates to a vascular support system.

Improvements in fluid volume measurement systems are disclosed for a pneumatically actuated diaphragm pump in general, and a peritoneal dialysis cycler using a pump cassette in particular. Pump fluid volume measurements are based on pressure measurements in a pump control chamber and a reference chamber in a two-chamber model, with different sections being modeled using a combination of adiabatic, isothermal and polytropic processes. Real time or instantaneous fluid flow measurements in a pump chamber of the diaphragm pump are also disclosed, in this case using a one-chamber ideal gas model and using a high speed processor to obtain and process pump control chamber pressures during fluid flow into or out of the pump chamber. Improved heater control circuitry is also disclosed, to provide added or redundant safety measures, or to reduce current leakage from a heater element during pulse width modulation control of the heater element. Improvements are also disclosed in an application of negative pressure during a drain phase in peritoneal dialysis therapy, and to control an amount of intraperitoneal fluid accumulation during the therapy. Improvements in efficiency are also disclosed in movement of fluid into and out of a two-pump cassette and a heater bag of the peritoneal dialysis cycler, and in synchronization of operation of two or more pumps in the peritoneal dialysis cycler or other fluid handling devices using a multi-pump arrangement.

Improvements in fluid volume measurement systems are disclosed for a pneumatically actuated diaphragm pump in general, and a peritoneal dialysis cycler using a pump cassette in particular. Pump fluid volume measurements are based on pressure measurements in a pump control chamber and a reference chamber in a two-chamber model, with different sections being modeled using a combination of adiabatic, isothermal and polytropic processes. Real time or instantaneous fluid flow measurements in a pump chamber of the diaphragm pump are also disclosed, in this case using a one-chamber ideal gas model and using a high speed processor to obtain and process pump control chamber pressures during fluid flow into or out of the pump chamber. Improved heater control circuitry is also disclosed, to provide added or redundant safety measures, or to reduce current leakage from a heater element during pulse width modulation control of the heater element. Improvements are also disclosed in an application of negative pressure during a drain phase in peritoneal dialysis therapy, and to control an amount of intraperitoneal fluid accumulation during the therapy. Improvements in efficiency are also disclosed in movement of fluid into and out of a two-pump cassette and a heater bag of the peritoneal dialysis cycler, and in synchronization of operation of two or more pumps in the peritoneal dialysis cycler or other fluid handling devices using a multi-pump arrangement.

A fluid damper having a damper housing with a first and a second fluid volume, and a damping piston located within the damper and separating the first and second fluid volume. The damper piston has a piston fluid pathway formed therethrough and between the first and second fluid volume. The fluid damper includes a fluid accumulator having an accumulator fluid volume. The fluid damper has a first fluid pathway extending between the first fluid volume and the accumulator fluid volume, and the fluid damper has a second fluid pathway extending between the second fluid volume and the accumulator fluid volume. A flow control valve is located in at least one of the first and the second fluid pathways, and the flow control valve has a non-zero threshold value.

An irrigation system for medical use comprises a catheter having an inflatable retention member, an electrically operated pump for pumping a fluid into the catheter for inflation of the inflatable retention member, and an electrically operated valve for deflation of the inflatable retention member. A controller is arrange to control the pump and the valve by determining an inflation flow rate into the inflatable retention member from the electrically operated pump and a deflation flow rate out from the inflatable retention member through the electrically operated valve, to continuously determine an inflation fluid volume based on the inflation flow rate, and a deflation fluid volume based on the deflation flow rate, to continuously determine a present fluid volume in the inflatable retention member as the inflation fluid volume reduced by the deflation fluid volume, and to prohibit operation of the electrically operated pump when the present fluid volume is determined to have reached a volume safety threshold.

A method of calibrating dosing valves of a sprayer system of an agricultural implement comprises initiating calibration by filling a calibrating tube with fluid having a fluid from an auxiliary tank of the sprayer system, measuring a volume of the fluid filled into the calibration tube, pumping the fluid in the calibration tube to the dosing valves to calibrate the dosing valves with respect to flow characteristics of the fluid with the dosing valves being capable of a high fluid flow rate to a low fluid flow rate ratio of at least 100:1 for the fluid. The method also includes pumping, during a pump from concentration tank mode, the fluid in the concentration tank to the dosing valves and then to a mixing apparatus with the fluid to be mixed with a carrier fluid from a primary tank of the sprayer system.

In certain embodiments, a vial adaptor comprises a housing configured to couple the adaptor with a vial, an access channel, a regulator channel, and a regulator assembly. The access channel is configured to facilitate withdrawal of fluid from the vial when the adaptor is coupled to the vial. The regulator channel is configured to facilitate a flow of a regulating fluid from the regulator assembly to compensate for changes in volume of a medical fluid in the vial. In some embodiments, the regulator assembly includes a flexible member configured to expand and contract in accordance with changes in the volume of the medical fluid in the vial. In some embodiments, the flexible member is substantially free to expand and contract. In some embodiments, the flexible member is not partly or completely located in a rigid enclosure.

A method for estimating an amount of blood loss within a waste container of a medical waste collection system, wherein an imaging device is supported by a device holder. The method includes analyzing an image, such as image frames of a video stream, to determine a fluid volume and a blood composition within a waste substance. These images may be adjusted based on a reference marker, and the method includes segmenting the images to determine blood, meniscus, and non-blood categories. A fluid meniscus of the waste material may be identified and mapped to a canonical coordinate space for pixel-to-volume conversion. Calibration data associated with the reference marker may be used to achieve this. At least one region of interest associated with an insert disposed within a waste container is analyzed. The estimated amount of blood loss may be displayed in real time based on the determined fluid volume and blood composition.

The invention discloses a low-temperature liquid cavitation numerical prediction method considering different-scale heat effects, and belongs to the field of low-temperature liquid cavitation numerical prediction. The implementation method comprises the steps that a corresponding fluid domain geometric model is established, grids are divided, a computational fluid mechanics model is established under the macro-scale, a separation vortex DES turbulence model is adopted, a fluid volume VOF model is used for capturing a macro-scale cavity interface, and convective heat transfer correction under the macro-scale is conducted on a cavitation model; establishing a cavitation kinetic equation considering heat conduction correction under the mesoscale, solving resistance, volume force, additional mass force, pressure gradient force and lift force suffered by the mesoscale discrete cavitation by using a DBM discrete phase model, and obtaining a movement track of the discrete cavitation in a cavitation flow field; and calculating the unsteady cavitation flow by taking a steady result as an initial value to obtain a flow field characteristic under a macroscale and a discrete cavitation dynamic evolution process under a mesoscale, thereby realizing quantitative description and high-precision numerical prediction of the unsteady cavitation flow.

Methods of actuating a needle array device can include causing fluid to move through flow channels to needle apertures that are spaced apart from an inflow aperture at different distances where flow channels that have approximately equal pathway lengths and where the fluid can reach tips of the needle apertures approximately simultaneously, which can provide an approximately equal dosage or fluid volume through the tips of the needle apertures.

A single use pouch device for carrying and subsequently dispensing a single use volume of a viscous skin treatment includes a pouch which contains a viscous skin treatment. The pouch has a total fluid volume sufficient to contain a pre-determined volume of the viscous skin treatment to cover a user's hands and arms. A first opening means is integrated into the pouch which enables a corner of the pouch to be removed thereby enabling the viscous skin treatment to be dispensed through the removed corner in a controlled manner. A second opening means is integrated into the pouch which enables the pouch to be divided thereby enabling the viscous skin treatment to be removed from the pouch. In this way the user can remove a maximum volume of the viscous skin treatment from the pouch.

Example methods, apparatuses, and computer program products for measuring fluid volumes are provided. An example fluid volume measuring assembly includes a first perforated tube, a total fluid volume measuring device, and a non-blood fluid volume measuring device. In some examples, the total fluid volume measuring device includes a membrane sack positioned in the first perforated tube and a first pressure sensor positioned in the membrane sack. In some examples, the non-blood fluid volume measuring device includes a second perforated tube covered by a filter paper and positioned in the first perforated tube and a second pressure sensor positioned in the second perforated tube.

The invention relates to a self-emptying separator, comprising a rotatable centrifuge drum (1) with a vertical axis of rotation, the centrifuge drum being provided with a solids discharge opening (7), the solids discharge opening being provided with an emptying mechanism having a piston slide valve (6), the piston slide valve being fluid-operable, in particular being moved by means of a fluid, into an open position and a closed position, the emptying mechanism also having a control device (28) provided for the piston slide valve (6) for controlling the opening and closing movement of the piston slide valve, the control device being provided with a controller (24) and a metering device (14) for metering and outputting a fluid quantity, in particular a liquid quantity, required for opening, the metering device (14) having a metering element (17) movable in a metering chamber (16), the metering element dividing the metering chamber (16) into a fluid chamber (18) and a pressure chamber (19) for applying compressed air, the metering device (14) having a regulating system for metering a fluid quantity, in particular a liquid quantity, required for opening in the fluid chamber (18), the regulating system having a measuring device (15) based on a fluid measurement principle.

The invention relates to the technical field of fracturing, in particular to a method and device for determining the mixing proportion of fracturing fluid, a medium and a product, and the method comprises the steps that the fluid injection amount of a target stratum is determined based on a relational expression between an engineering dessert coefficient and a sand-fluid ratio, a relational expression between the sand-fluid ratio and the fluid injection amount and a stratum engineering dessert coefficient; determining the ultra-high viscosity slick water liquid amount from the turning point of the ultra-high viscosity slick water liquid amount of the fractured section; based on the turning point ratio of the high-viscosity slick water to the low-viscosity slick water, the liquid injection amount of the target stratum and the liquid amount of the ultra-high-viscosity slick water, the liquid amount of the high-viscosity slick water and the liquid amount of the low-viscosity slick water are obtained; according to the method, the proportion of slick water with different viscosities can be determined more scientifically, uncertainty caused by trial and error and blind reference to adjacent wells is avoided, and the method has positive effects on optimizing fracturing construction parameters, increasing fracturing volume, reducing fracturing cost and improving fracturing efficiency.

A fluidic pump test device includes a fluidic pump, a pressure influencing device, and an evaluation device. The fluidic pump is configured to be driven by a drive device. The fluidic pump is configured such that a rotational speed of the fluidic pump, which leads to a fluid volumetric flow on an output side of the fluidic pump, is known. The pressure influencing device is configured to: (i) conduct, at least temporarily, the fluid volumetric flow; and (ii) during operation of the fluidic pump, bring about a pressure drop. The evaluation device is configured to, based on a decrease of the pressure drop, determine a reduction in a functional capability of the fluidic pump.

A medicinal infusion system includes a safety valve for isolating residual medication by providing a single point of fluidic disconnect to encapsulate a residual fluid volume prone to spillage. The safety valve couples a medicinal repository such as an infusion pump to a medicinal supply, typically from a syringe or tubing. The safety valve includes a resilient, deformable, or hinged surface for isolating and sealing the medicinal flow to eliminate and / or isolate any residual volume in tubing and connectors. The isolating surface accommodates an inserted fitting or coupling for allowing the medicinal flow to fill the infusion pump. Upon disconnection, fluids on either side of the safety valve are therefore isolated on the respective fill or source sides, and residual volume prone to spillage is eliminated.