175results about "Flow control" patented technology

A monitoring apparatus for monitoring fluid flow into or out of a patient comprises a fluid flow sensor and an output means. The fluid flow sensor is configured to attach to a fluid line fluidly connected to the patient and measure fluid volume data comprising data proportional to the volume of fluid which has passed through the fluid line over a time period. The monitoring apparatus is configured to determine, using the fluid volume data, a volume of fluid which has passed through the fluid line over the time period. The output means is configured to provide an output based on the volume of fluid and the time period.

A liquid level sensor can include a circuit board and a thermistor bridge supported by the circuit board comprising a first pair of thermistors and a second pair of thermistors. A heat sink can be coupled to the circuit board proximate the first pair of thermistors and not the second pair of thermistors. A power supply can be configured to provide pulses of electrical current through the thermistor bridge. A controller in communication with the thermistor bridge can be configured to receive a measurement signal from the thermistor bridge output a low product indication when the measurement signal satisfies a predetermined condition.

The application discloses a control method and a control device of a liquid infusion system, and belongs to the technical field of clinical infusion. The liquid infusion system is used for liver surgery, and comprises a collection module and an infusion module. The collection module is used for collecting physiological indexes of a patient. The infusion module is used for preparing a liquid solution and infusing the liquid solution into the patient. The control method comprises the following steps: acquiring the physiological indexes of the patient, determining a target liquid formula according to the physiological indexes, controlling the infusion module to prepare the liquid solution according to the target liquid formula, and infusing the liquid solution into the patient, so as to eliminate abnormal items in the physiological indexes, thereby being favorable for improving the success rate of liver surgery, reducing the workload of medical staff in the surgical process, improving the treatment efficiency, and reducing the adverse prognosis rate.

The application provides an infusion pump empty bottle early warning method and device based on pipeline pressure and an infusion pump. The method comprises the following steps: acquiring a plurality of upper pressure sensing values, determining a reference pressure value of a target period, and taking the maximum value in the upper pressure sensing values as the reference pressure value; determining a first difference value according to the reference pressure value of the target period and a previous reference period; determining a second difference value according to adjacent first difference values; and when the number of consecutive negative second difference values meets a first preset threshold value and the first difference value of the target period is less than a second preset threshold value, performing an empty bottle early warning operation. According to the technical scheme of the embodiment of the application, the pressure sensing device has small space occupation and simple structure; the change of the upper pressure caused by the rapid drop of the liquid level at the bottle opening is utilized, the change trend of the upper pressure of the infusion tube is represented by the second difference value, the change amplitude of the upper pressure is represented by the first difference value, and the rapid and accurate detection of the empty bottle is realized in combination.

This present disclosure relates to systems, devices, and associated methods for fluid therapy based on patient data, including managing fluid levels of the patient based at least partially in response to data received from the patient before and / or during the fluid therapy. In some embodiments, the systems, devices, and methods described herein are used to treat a patient for fluid overload. To treat fluid overload, patients can be administered a diuretic which induces and / or increases urine production and a hydration fluid that replaces at least some of the fluid removed from the patient as urine. The diuretic and / or the hydration fluid can be administered according to a number of different administration regimens.

The present invention relates to a valve arrangement and a valve assembly with several valve arrangements, and a method for controlling a valve arrangement, wherein the valve arrangement comprises several valves arranged in parallel. The individual valves of the valve arrangement can be controlled based on control signals with a modulated pulse width.

Capillary-based pressure threshold sensors are provided for liquids that exploit the properties of hydrophobic, superhydrophobic, oleophobic and amphiphobic porous membranes to detect when fluid passes through the membrane in the event of the pressure across the membrane rising above the breakthrough pressure of a fluid. Example implementations are provided of different configurations for a capillary-based pressure threshold sensor, and of how a capillary-based pressure threshold sensor is used in a medication delivery device or other fluid delivery devices to detect occlusion or other fluid flow condition.

The application provides a bubble detection system and method, wherein the bubble detection system comprises a bubble detection unit and a processing unit connected with the bubble detection unit; the processing unit sequentially sends a plurality of different candidate instructions to the bubble detection unit; the bubble detection unit, for each candidate instruction, sends a first signal to a to-be-tested infusion tube according to a signal frequency indicated by the candidate instruction, determines a second signal corresponding to the candidate instruction, and sends the second signal corresponding to each candidate instruction to the processing unit; the processing unit determines signal strengths of the second signals corresponding to the candidate instructions, and determines a control instruction in the plurality of candidate instructions according to a preset screening rule; and the bubble detection unit performs bubble detection on the to-be-tested infusion tube according to the control instruction. In the embodiment, the control instruction is screened according to the signal strengths of the second signals corresponding to the plurality of candidate instructions, so that the bubble detection precision of the bubble detection system is improved.

According to the present invention, an air pump conventionally located in a sensor module is relocated to a flow control module, thereby reducing the noise of the sensor module and making it possible to reduce the size of the sensor module. In addition, a system is modularized so that any equipment failures that occur can be quickly resolved. To this end, the system comprises: a plurality of sensor modules that include a particle sensor for measuring the concentration of particles in the air, an air inlet and an air outlet for generating airflow, and a communication port; a flow control module that includes a gas sensor, a valve, an air pump, a manifold block, and a control circuit; and a monitoring module that receives values measured by the sensor modules and values measured by the gas sensor from the flow control module.

Feed and flush delivery devices are described for use in switching between delivery of enteral feeding fluid and flushing / hydration fluid to a patient, with both fluids being delivered through the same closed system. The delivery devices are simpler, easier to use, and are more cost effective than known prior art valves and control devices. Independent feed and flush lines are typically received by the delivery device, which merges the two lines into a single end delivery line so that either feeding or flushing fluid, but not both at the same time, can be conveyed through the end line, as desired and selected by the user. The delivery device is loaded onto the pumping mechanism of an enteral infusion pump, and can be part of a cassette which is used in combination with a particular brand of infusion pump.

A system and method of accurately measuring a pressure (Pp) within a human brain using totally-implanted or partially-external hardware. The system includes a first pressure transducer configured to measure a cerebrospinal fluid pressure (Pcsf) within a ventricle of a brain, a second pressure transducer configured to indirectly measure a second pressure (Pp) within a space of the brain, and an adjustable implanted valve controller configured to calculate the effective differential pressure (Pei = Pcsf - Pp) between the measured pressures Pcsf and the Pp and determine whether the effective differential pressure measurement represents a true secondary pressure.

A method and apparatus for determining an inactive time of a medical liquid dose calculator are provided. According to the method, an infusion error of a medical liquid infusion device may be detected, and an inactive time of the medical liquid dose calculator may be determined in response to detection of the infusion error.

The invention relates to a device for controlling several infusion pumps (2-10), a respective infusion substance being allocated to each infusion pump (2-10). Said infusion substance is fed to a living thing as an infusion with a predeterminable infusion rate, over a predeterminable assigned period. The infusion pumps (2-10) automatically exchange control data with each other in order to co-ordinate the activation and deactivation times of the different infusions.

To provide a valve system that allows a valve opening position of a blocking valve to be estimated sooner.SOLUTION: A valve system 1 includes a tank 2 capable of storing fluid, a pressure sensor 6 for detecting inner pressure of the tank 2, a valve 4 having a valve body 11 and opening / closing the tank 2, a stepping motor 12 for stroking the valve body 11 of the valve 4, and a control device 5. The control device 5 moves the valve 4 in a valve opening direction after the start of a cycle, reverses the moving direction of the valve body 11 of the valve 4, moves the valve to a stand-by position for a valve closing state, calculates a first pressure change ratio, which is a change ratio of the inner pressure from the start of the cycle, determines a stand-by time so that a second pressure change ratio of the inner pressure, which is a change ratio of the inner pressure from the start to the end of the cycle, is equal to a target change ratio if the first pressure change ratio is greater than the target change ratio, and stops the stepping motor 12 at the stand-by position until the determined stand-by time elapses.SELECTED DRAWING: Figure 1

Method and system for controllably administering and / or withdrawing fluid from a patient. In one embodiment, the system may include a needle assembly, an ultrasound imager, a fluid supply storage unit, a waste storage unit, a fluid pump, and a foot pedal assembly. A syringe may serve as the fluid supply storage unit and the waste storage unit. The pump may include a bi-directional motor and a gear coupled to the motor. The gear may be engageable with a rack on the syringe plunger to drive the plunger either for fluid aspiration or infusion. Depression of one portion of the foot pedal assembly causes the motor to drive the gear in one direction, and depression of another portion of the foot pedal assembly causes the motor to drive the gear the other direction. The system may include a control device to keep pressure in the fluid path from exceeding a limit.

The application relates to the technical field of indwelling needles, and discloses an indwining needle capable of preventing blood backflow, which comprises a venous tube, a filling pipeline fixedly connected to the top of the venous tube, a hose fixedly connected to the outside of the filling pipeline, a mixed liquid tube fixedly connected to one end of the hose, a transfusion tube fixedly connected to one end of the mixed liquid tube, a heparin cap fixedly connected to the other end of the mixed liquid tube, a drainage ball movably connected between the filling pipeline and the hose, and second anastomosis walls for anastomosing the drainage ball formed by the concave shapes of the two sides of the replacement ring, a drainage hole arranged on the drainage ball, the filling pipeline communicated with the hose through the drainage hole, and a three-labium sealing plate movably connected to the inside of the filling pipeline. The indwining needle capable of preventing blood backflow is characterized in that blood in the hose flows into the inside of the filling pipeline, and when the liquid level in the inside of the filling pipeline drops, the three-labium sealing plate slowly drops to re-contact the drainage ball, so that the channel between the filling pipeline and the hose is closed, thereby preventing the possibility of blood backflow in the pipeline.

A substance feeding device, a mixing system, and a battery production line are provided, relating to the field of substance conveying technologies. The substance feeding device helps to improve precision of controlling a weight of a conveyed substance. The substance feeding device includes: a buffer member (1), a conveying assembly (2), a weight meter (3), and a control assembly (4). The buffer member (1) is configured to store a substance; one end of the conveying assembly (2) is connected with the buffer member (1); the conveying assembly (2) has at least two conveying ports (21); the conveying port (21) is configured to connect with a target device; the weight meter (3) is connected with the buffer member (1) and is configured to detect a weight of the substance in the buffer member; each conveying port (21) is provided with one control assembly (4); the control assembly (4) is configured to control communication and cutoff of a pipeline between the conveying port (21) and the corresponding target device; the control assembly (4) includes a back pressure valve (41); and the back pressure valve (41) is disposed on the conveying port (21) and capable of being connected with the target device. The provided substance feeding device is configured to feed the substance into the target device.

This invention relates to the field of pipe blockage detection technology and discloses a pipe blockage detection method for a squeeze-type fluid conveying device, comprising: acquiring at least one response parameter associated with the load state of the squeeze actuator during each squeeze drive cycle; comparing the response parameter with a pre-established normal response model of the squeeze-fluid system; and determining that the fluid pipeline is blocked and triggering a blockage response when the response parameter continuously deviates from the normal response model and meets a preset continuous judgment condition during multiple consecutive squeeze drive cycles. This invention effectively overcomes the problem of strong detection lag in existing technologies by establishing a real-time correlation mechanism between the squeeze action and the pressure change inside the pipe, synchronously acquiring and analyzing pressure signals in each squeeze cycle, thereby achieving dynamic and real-time monitoring of the pipeline status.

An apparatus includes a cannula assembly, a housing, a fluid reservoir, a flow control mechanism, and an actuator. The housing includes an inlet port removably coupled to the cannula assembly and defines an inner volume. The fluid reservoir is fluidically coupled to the housing and configured to receive and isolate a volume of bodily fluid from a patient. The flow control mechanism is at least partially disposed in the inner volume. The actuator is operably coupled to the flow control mechanism and is configured to move the flow control mechanism between a first configuration, in which bodily fluid can flow, via a fluid flow path defined by the flow control mechanism, from the cannula assembly, through the inlet port and into the fluid reservoir, to a second configuration, in which the fluid reservoir is fluidically isolated from the cannula assembly.

A system is provided. The system includes a substrate container having at least two purge modules. Each purge module of the at least two purge modules includes a flow control device. The flow control device of each purge module is configured to be actuated for egress of a purge fluid. A method of actuating flow control devices of purge modules of a substrate container is provided. The method includes starting a purge process of the substrate container; streaming a purge fluid into an interior of the substrate container, the substrate container having at least two purge modules, each purge module of the at least two purge modules including a flow control device, the flow control device of each purge module being configured to be actuated for egress of the purge fluid; and actuating the flow control device for egress of the purge fluid.

A closed-loop system for blood pressure control that accounts for various mechanisms of the cardiovascular system. In some example cases, a pharmacokinetic-pharmacodynamic model of the cardiovascular system's response to cardiovascular system actuators, such as vasoactive drugs, is generated. Two example actuators are employed in the example framework: phenylephrine, to raise blood pressure, and nicardipine, to lower blood pressure. The pharmacodynamic components employs a two-element Windkessel model. A model predictive control framework is built based on the pharmacokinetic-pharmacodynamic model.

This application relates to a method and system for early warning of extravasation risk in outpatient infusions. The method includes: extracting corresponding visual frames, physiological signal data points, and medical event records from real-time acquired visual frame sequences, physiological signal sequences, and medical event streams; extracting and integrating features from these data to construct spatiotemporal sample units; inputting these spatiotemporal sample units into a gated spatiotemporal joint encoder to generate potential risk states characterizing the comprehensive risk status at the current moment; adding these potential risk states to a risk potential state sequence maintained for the patient to obtain an updated risk potential state sequence; performing risk analysis based on the updated risk potential state sequence to generate an evidence chain; and performing decision mapping based on the evidence chain to generate a decision report. This method, through multimodal spatiotemporal data fusion and a gated dynamic coding mechanism, achieves real-time and accurate perception and dynamic evolution modeling of extravasation risk, improving the intelligence level of outpatient infusion safety monitoring and the timeliness of risk intervention.

The application discloses an infusion pump capable of accurate infusion. A controller collects motor step displacement information and corresponding motor current information in a preset sampling period, and synchronously collects infusion pipeline pressure information, generates operation observation records and updates consumable use states; when the consumable use states meet a preset insertion interval or the operation observation records meet a calibration trigger condition, a trace calibration pulse sequence is outputted without changing a target infusion setting, corresponding current responses and pressure responses are recorded to generate calibration observation records; based on the calibration observation records, unit step displacement parameters are updated according to a recursive update rule, and an uncertainty is generated; the target dose is converted into a step output instruction according to the updated unit step displacement parameters, and a safety evaluation quantity is generated in combination with the uncertainty to support control strategy switching. The method can correct the displacement drift caused by the wear and aging of the consumables online and quantify the reliability, and improves the dose consistency and operation safety of long-term infusion.

The drug injection device according to the present invention comprises: a drug storage unit the thickness of which varies according to the amount of drug to be injected; a pump assembly which is connected to the drug storage unit, and draws in and discharges the drug stored in the drug storage unit; and a drug injection detection unit which detects a change in the thickness of the drug storage unit and controls the operation of the drug injection device according to the change in the amount of the drug stored.

A blood collection device can include a syringe having hemolysis protection. The syringe with hemolysis protection can be coupled to a catheter assembly and used to draw blood. The blood collection device can include a syringe that can include a distal end and a flow restrictor. The flow restrictor can include a distal end and a proximal end. The proximal end of the flow restrictor can be coupled to the distal end of the syringe such that hemolysis can be protected against.

The embodiment of the present application discloses a kind of gas circulation device, gas circulation method, pneumatic device and semiconductor equipment, gas circulation device is applied to the pneumatic device including electromagnetic valve device and cylinder device, and it is connected between electromagnetic valve device and cylinder device.Gas circulation device includes valve core structure, first circulation cavity and second circulation cavity;Valve core structure is used to be collected and stored when moving along the first direction, the compressed gas that the first cylinder cavity of cylinder device is discharged via electromagnetic valve device by first circulation cavity, and the compressed gas stored by second circulation cavity and the compressed gas provided by electromagnetic valve device are collectively inflated for the second cylinder cavity of the cylinder device.It is like this, for the compressed gas discharged by cylinder device, it is recycled by gas circulation device, and the recycled compressed gas can also be used to inflate cylinder device, so as to realize the recycling of compressed gas, reduce compressed gas consumption, save cost.

Disclosed are examples for a system for drug delivery and components thereof. The system may include an on-body pump device and a secondary unit. The on-body pump device may include a reservoir and a fluid pathway. The reservoir may be configured to hold a liquid drug. The secondary unit may be removably coupled to the on-body pump device. The secondary unit may be configured to receive a prefilled cartridge containing a liquid drug, expel the liquid drug from the prefilled cartridge, and deliver the liquid drug to the reservoir of the on-body pump device via the fluid pathway. Examples of variations to the secondary unit are also disclosed.