123 results about "Flow limitation" patented technology

A device for delivering fluid, such as insulin for example, to a patient. The device includes a flow path having an exit port assembly adapted to connect to a transcutaneous patient access tool, and a reservoir connected to the exit port assembly. The device also includes a flow restriction system having an air removal filter communicating with the flow path and allowing air to exit the flow path and preventing fluid from exiting the flow path, and a flow restrictor positioned within the flow path between the air removal filter and the exit port assembly. Among other features and advantages, the flow restriction system of the present invention allows the flow path of the fluid delivery device to be purged of air, or “primed” prior to operation, such that desired volumes of fluid can be accurately delivered by the device.

A device for delivering fluid, such as insulin for example, to a patient. The device includes a flow path having an exit port assembly adapted to connect to a transcutaneous patient access tool, and a reservoir connected to the exit port assembly. The device also includes a flow restriction system having an air removal filter communicating with the flow path and allowing air to exit the flow path and preventing fluid from exiting the flow path, and a flow restrictor positioned within the flow path between the air removal filter and the exit port assembly. Among other features and advantages, the flow restriction system of the present invention allows the flow path of the fluid delivery device to be purged of air, or “primed” prior to operation, such that desired volumes of fluid can be accurately delivered by the device.

A tourniquet cuff has minimal flow restrictions within its pneumatic passageway under normal operating conditions, has a substantially reduced likelihood of partial or complete obstructions or interruptions of the pneumatic passageway under foreseeable operating conditions, can indicate exposure of the cuff to external agents that are capable of affecting the integrity of the pneumatic passageway before use, and can be manufactured economically.

A ventilator of the present invention includes a housing, a gas flow generator disposed in the housing, a gas outlet port provided on an exterior surface of the housing, and a first conduit coupling the gas flow generator to the gas outlet port. A gas inlet port is also provided on an exterior surface of the housing. A second conduit couples the gas inlet port to a first exhaust valve in the housing that regulates a flow of exhaust gas from the second conduit. A second exhaust valve in the housing is coupled to the first conduit and regulates a flow of exhaust gas from the first conduit. A controller coupled to second exhaust valve causes the second exhaust valve to change a degree of flow restriction based on a respiratory phase of a patient coupled to the ventilator when the ventilator is operating in a single-limb ventilation configuration.

A method for controlling operation of a CPAP apparatus. The apparatus has a blower (2), a patient interface (6), an air delivery conduit (8) for delivering air from the blower (2) to the patient interface (6), a sensor (4p) for determining the pressure in the patient interface (6), and a control mechanism (15) that causes air to be delivered at a desired pressure to the patient interface (6) and that detects transitions between inhalation and exhalation of a respiratory cycle of a patient in order to synchronise the blower output with the patient's efforts. In one form the CPAP apparatus provides pressure in accordance with a bi-level waveform with at least one characterising parameter of the waveform being automatically adjusted in accordance with indications of sleep disordered breathing. The indications of sleep disordered breathing can be one or more of snoring, apnea, hypopnea, and flow limitation.

A drug delivery device (10) includes a pressurized reservoir (14) in communication with a flow path to an outlet (12). The flow path includes two normally-closed valves (16, 18) and a flow restriction (18). A pressure measurement arrangement (22) measures a differential fluid pressure between two points (24, 26) along the flow path which span at least part of the flow restriction (18), one of the points being between the valves (16, 18). A controller (28) selectively opens the valves (16, 18) to deliver a defined quantity of the liquid medicament to the outlet (12).

A ventilator of the present invention includes a housing, a gas flow generator disposed in the housing, a gas outlet port provided on an exterior surface of the housing, and a first conduit coupling the gas flow generator to the gas outlet port. A gas inlet port is also provided on an exterior surface of the housing. A second conduit couples the gas inlet port to a first exhaust valve in the housing that regulates a flow of exhaust gas from the second conduit. A second exhaust valve in the housing is coupled to the first conduit and regulates a flow of exhaust gas from the first conduit. A controller coupled to second exhaust valve causes the second exhaust valve to change a degree of flow restriction based on a respiratory phase of a patient coupled to the ventilator when the ventilator is operating in a single-limb ventilation configuration.

This patent application discloses method and apparatus to cut an extended slot connecting a well to a substantial cross section of a desired producing formation whereby material can flow freely between the formation and the wellbore and at least partially overcome the flow limitations of low permeability formations without the environmental issues associated with hydraulic fracturing. It is further disclosed that the connection between said slot and the formation may be further enhanced by explosive or combustive processes that rapidly generate gas pressure within the large surface area of the slot, thereby changing its characteristics and forcing open additional fractures into the cross section of formation exposed to the slot. The method may significantly increase the recoverable percentage of natural gas from low permeability deposits such as shale and coal.

The invention discloses a flow management method capable of being sensed by QoS (Quality of Service) in a software defined network. The flow management method comprises the following steps: sending a QoS requirement to the network through network upper-layer application of the software defined network; inspecting an application service quality request by the network and dividing application flow into a plurality of classes with different priority levels; identifying the application flow and carrying out different routing on the application flow with different classes; monitoring utilization rates of all links and carrying out flow scheduling on a congestion link; carrying out flow limitation on the congestion link subjected to the flow scheduling. According to the flow management method, different QoS strategies are adopted on data flows with different requirements; the data with a high priority level is subjected to priority processing and flow in the network is discriminately treated; critical business flow smoothly passes through the network.

The invention concerns a simulated moving bed adsorption separation device comprising a limited number of valves. According to the invention, the device comprises a column with a plurality of sectors Sk with 2 superimposed plates Pi with a single distribution network, each sector Sk comprising an external principal bypass line Lk connected to each plate Pi of Sk via a plate valve Vi. Each line Lk comprises a flow limitation means and is connected to each of the fluid networks via a single valve.Further, the connectors of lines Lk onto the column are offset by at most 20° inside Sk to limit the volume of lines Lk, and are offset by a mean angle in the range 70° to 110° between two neighbouring sectors Sk and Sk+1 so as not to weaken the column mechanically. The plates preferably comprise panels DMEi,j with parallel segments the direction of which varies from plate to plate or per group of 2 plates.The invention also concerns a separation process using said device, in particular to separate para-xylene or meta-xylene from an aromatic C8 cut.

A surge-flow regulator (36) for use with an ophthalmic surgical instrument (12) having an infusion line (20) adapted to irrigate a surgical site with fluid and an aspiration line (24) adapted to carry the fluid and particles of lenticular debris away from the surgical site. The surge-flow regulator (36) includes a flow limiting device (40) that is placed in fluid communication with the aspiration line (24) to control surge-flow of the aspirated fluid and lenticular debris through the aspiration line (24). The lenticular debris carried in the aspiration line (24) is processed into smaller particles before the fluid and debris are introduced to the flow limiting device (40).

A device for, when connected to a vacuum system, conducting aspiration fluid away from a surgical site includes a conduit having a portion adapted for insertion into the surgical site. The device also includes a flow limiter interposed between the vacuum system and the conduit and in fluid communication with the conduit. The flow limiter has at least two orifices arranged in series and a flow path interconnecting the at least two orifices. The flow path has a flow area that is greater than a flow area of each one of the at least two orifices. Aspiration fluid flows through the conduit and the flow limiter in response to a pressure drop between the surgical site and the vacuum system. The flow limiter produces a non-linear relationship between a rate of aspiration fluid flow and the pressure drop.

Respiratory pressure treatment apparatus include automated methodologies for controlling changes to pressure in the presence of sleep disordered breathing events. In an example apparatus, various levels of expiratory pressure relief can provide different pressure reductions for patient comfort during expiration (333-A, 333-B, 333-C). The control parameters for these levels may be automatically modified based on the detection of an open airway. Similarly, in some embodiments, the levels may be automatically adjusted based on a detection of persistent obstruction. In still further embodiments, control parameters associated with a rise time of an early portion of an inspiratory pressure treatment may be automatically adjusted upon detection of flow limitation to permit a change to more aggressive waveforms from more comfortable waveforms for the treatment of sleep disordered breathing events.

The description relates to a device for the regulation of the amount of a medium in a heating or cooling system, comprising a combined valve, which in one and the same valve housing includes one part for pressure difference regulation (2) and one part for flow limitation (3), the flow being limited in a stepless, adjustable way, i.e. the device obtaining an adjustable Kvs-value. Also, the chosen Kvs-value can be limited by a plunger, which always can operate with its complete stroke length.

A method and apparatus of determining the level of exhaled nitric oxide (NO) is disclosed. The method involves measuring the level of exhaled NO (34) and the corresponding exhalation flow rate in one or more exhalations (30, 32) of a tidal breathing manoeuvre performed by a subject. The data is used with a model describing the flow dependence of exhaled NO to derive a value for exhaled NO corresponding to a fixed flow rate, especially to an exhaled NO level corresponding to a fixed flow rate of 50 ml / s. During the manoeuvre a variation in flow restriction (31) may be applied so as to vary the overall flow rate of exhalation. The method offers a simple and quick way to determine exhaled NO levels with good accuracy and is suitable for use with children.

The invention discloses a method determining a controllable vibration source best low-frequency scanning signal. Equal-frequency scanning signals are adopted, vibration source output force is increased gradually to carry out excitation, the least square method is used for carrying out matching on measured vibration source low-frequency sampling point actual output maximum output force, a controllable vibration source low-frequency output curve is determined according to a fitting heavy punch maximum displacement curve and the focus of a system flow curve, a low-frequency section scanning time length is calculated, the frequency, amplitude and phase of each sampling point of the low-frequency section are calculated, a scanning signal is generated to carry out practical testing on the vibration source, and the best low-frequency scanning signal is obtained until a vibration result does not exceed heavy hammer displacement limitation or the flow limitation. According to the method determining the controllable vibration source best low-frequency scanning signal, the low-frequency components of the controllable vibration source scanning signal are significantly enhanced, the method determining the controllable vibration source best low-frequency scanning signal is suitable for an existing controllable vibration source, can exert the maximum potential of the low frequency of the controllable vibration source, the low frequency signal is small in signal distortion, the output frequency spectrum of the controllable vibration source is smooth and white-noised, and the controllable vibration source can be protected well.

The invention concerns a simulated moving bed (SMB) separation device and process comprising a column, beds Ai of adsorbent separated by plates Pi with a single distribution and extraction network for fluids, in particular feed F, desorbant D, raffinate R and extract E, and a plurality of two-way valves for distribution of said fluids, said valves being limited in number and in particular with dimensions that are smaller than in the prior art. According to the invention, the column is divided into a plurality of sectors Sk with 2 superimposed plates, each sector Sk comprising an external principal bypass line Lk connected to each plate Pi of Sk via a large diameter plate valve Vi and an external secondary bypass line Mk comprising a small diameter valve VMk connected to the adjacent sector Sk−1. Each line Lk comprises a flow limitation means, and is connected to each of the fluid networks F, D, R, E via a single large diameter valve for sequential supply or withdrawal of the corresponding fluid F, D, R or E to or from the sector Sk under consideration.

The invention discloses an information sharing method. The method comprises the following steps that (1) users establish connection with the wireless local area networks of a WIFI server through mobile client terminals; (2) the users who log in for the first time complete register according to the prompts of a user authentication module, the users who do not log in for the first time access the wireless local area network according to accounts and passwords; (3) a user behavior analysis module judges the behaviors of the users, and selects push information; (4) a network demand service module judges whether an external network needs to be connected or not according to the instructions input by the users; (5) connection with the external network is established through the WIFI server if the external network needs to be connected, and otherwise, connection with a mass storage is established through the WIFI server. The invention further discloses an information sharing system. According to the information sharing method and the information sharing system, the information service of a broadband network can be provided, passengers in public transportation processes can enjoy network informationalized services without flow limitation, and most suitable information content recommendation can be provided according to the information service needs of the users.

The description relates to a device for the regulation of the amount of a medium in a heating or cooling system, comprising a combined valve, which in one and the same valve housing includes one part for pressure difference regulation (2) and one part for flow limitation (3), the flow being limited in a stepless, adjustable way, i.e. the device obtaining an adjustable Kvs-value. Also, the chosen Kvs-value can be limited by a cone, which always can operate with its complete stroke length.

A system for accepting fluid from a source supply, then ejecting it along a substantially non-radial laterally oriented locus such that the fluid enters a cup with a mixing effect but with only minimal splashing, typically including a restriction element frame which substantially bisects the cup serves to control access thereto and a float based automatic flow restricting element; and methodology for its use in the liquid feeding of animals such as piglets.

The invention provides a flow limiting method for point-to-point application, mainly comprising: counting message flow; according to the counted result, identifying message into P2P (point-to-point) application message, and making low limitation operation on the P2P application message. And it can identify P2P conservation according to flow model and making flow limitation on the identified P2P conservation.

The invention provides a station automatic flow limiting method based on multipoint passenger flow information feedback.It comprises the steps that the number of passengers in a station hall and the number of passengers at a platform are detected and calculated in real time, and in addition, the number increase trend of the passengers at the platform is analyzed; the rest quantity of passengers capable of being contained in the station hall and the rest quantity of passengers capable of being accommodated at the platform are calculated; the number of passengers going into or out of the station hall is regulated in real time according to the rest quantity of passengers capable of being contained in the station hall; the number of passengers going into or out of the platform is regulated according to the rest quantity of passengers capable of being accommodated at the platform; the number increase of the passengers in the station hall caused by the passengers going into or out of the platform is regulated according to the number of the passengers going into or out of the platform, and the number of the passengers going into or out of the station hall is further regulated for reaching the flow limiting goal. The station automatic flow limiting method has the technical scheme that the numbers of the passengers of the platform and the station hall are detected and calculated in real time, the number of the passengers at the platform is subjected to flow limitation through the increase trend of the number of the passengers at the platform, meanwhile, when the practically detected number of the passengers exceeds the number of the passengers capable of being accommodated at the platform, the flow limitation is carried out in real time through further regulating the number of the passengers going into the platform and the station hall, the algorithm is precise, the flow limiting modes are comprehensive, the timeliness is high, and safety and reliability are realized.

The invention discloses an ESME short message flow control system and a method. The method includes the following steps: configure flow limitation message for the ESME; the flow limitation message includes a message buffer threshold and a buffer gross threshold; the short message service center receives ESME short messages and judges whether the prior ESME flow reaches the message buffer threshold; if yes, cache the ESME short message exceeding the short message buffer threshold. The invention can improve success rate of burst large capacity of EMSE origination and termination short message and is good for guaranteeing SMSC stable operation.

Flow restrictors for use with a syringe or without a syringe are disclosed for dispensing a liquid medicine for an infant or child. The flow restrictors include a cover having a raised ring, a sleeve for insertion into a bottle, a self-sealing orifice for dispensing the medicine and including an annular cylinder having vertical supports or ribs which extend outward and engage the inside wall of the sleeve. The sleeve includes one or more external protrusions.

The invention provides a linkage regulation and control method for the passenger flow of a station. The method comprises the following steps of detecting and calculating the number of passengers on a platform and the number of passengers in a transfer tunnel in real time; calculating passenger capacity balances of the transfer tunnel and the platform and a difference value between the passenger capacity balances; calculating linkage flow limiting comprehensive indexes of each associated non-transfer station, wherein the number of the passengers is required to be reduced after flow limitation; regulating the number of the passengers entering the platform in a transfer station according to the passenger capacity balance of the platform, and if the number of the passengers of the platform is greater than the passenger capacity of the platform, starting a linkage flow limiting measure to achieve the aim of flow limitation according to the linkage flow limiting comprehensive indexes. According to the scheme, the numbers of the passengers of the platform and the transfer tunnel of the transfer station are detected as parameters in real time, and an algorithm is accurate and scientific; a linkage flow limiting control measure is adopted for the linkage regulation and control flow limitation of the associated non-transfer stations in a way of combining local flow limitation of the transfer station and flow limitation of the associated non-transfer stations, flow limiting means is systematic, comprehensive and high in timeliness, and the phenomenon of congestion of the station can be timely eliminated.