98 results about "Pulsatile flow" patented technology

An embodiment includes a system comprising: an artery, a vein, and a nerve; a first length of tubing adjacent at least one of the vein, artery, and nerve; a second length of tubing to couple to the first length of tubing; and a pump comprising a number of actuators; wherein when the system when operating is configured such that (b)(i) the second length of tubing couples to at least one of the number of actuators, (b)(ii) ends of the first and second lengths of tubing are closed, (b)(iii) a second end of the first length of tubing is operatively coupled to a second end of the second length of tubing, (b)(v) the pump pulsates fluid within the first length of tubing in response to the number of actuators intermittently contacting the second length of tubing.

The invention discloses an artificial heart valve near-physiological pulsation fluid external evaluation device and method, and relates to the technical field of heart valve testing.The artificial heart valve near-physiological pulsation fluid external evaluation device comprises a supporting frame, a driving unit, a tested valve installation unit and an artery and peripheral loop unit, the driving unit provides power for liquid flowing, and the tested valve installation unit is used for fixing an artificial heart valve; and a liquid volume assembly and a resistance assembly of the artery and peripheral loop unit can simulate the compliance and resistance of aorta blood vessels and peripheral artery blood vessels, so that the pressure waveform simulation of the systemic circulation loop is more accurate. On the basis of the air cavity, the elastic corrugated pipes with different frequency responses are arranged, the compliance and rebound resilience of the aorta are simulated, a device for rapidly replacing the tested valve is designed, and the mechanical property of the simulated human body aorta is adjusted by adjusting the parameters such as the output frequency and the vibration amplitude of the driving unit; real pressure and flow waveforms under different physiological / pathological conditions are simulated, and a more accurate and convenient detection environment is realized.

The invention provides an artificial heart valve thrombus risk assessment method and device. The thrombus risk assessment method for the artificial heart valve comprises the following steps: acquiring a physiological scene after the artificial heart is implanted into the artificial valve through a resistance characteristic parameter and an elastic expansion characteristic parameter; starting a pulsating pump to output a pulsating flow medium to the artificial heart in a physiological scene; capturing the motion trail of the fluorescent particles through a high-speed camera and obtaining the original data of the blood flow velocity at the downstream of the artificial valve; acquiring a fluid mechanics simulation parameter group according to the blood flow velocity original data; and inputting a pre-trained valvular thrombus random forest classifier according to the fluid mechanics simulation parameter group, and outputting a thrombus risk probability graph in the physiological scene. According to the method, the fluid mechanics simulation parameter group is calculated based on the instantaneous velocity vector field captured by the PIV and the space-time distribution information, the two-dimensional / three-dimensional thrombus risk probability graph is generated through the random forest classifier, the high-risk point coordinates are marked, and the thrombus probability and the thrombus position are accurately predicted.

Disclosed herein is a 3D printed heart model with simulated cardiac stroke volumes. It involves an inner membrane conforming to the shape of the inner lining of the ventricle. This results in the creation of a compression pouch with a potential space (compression sac) bordered by the inner surface of the simulated ventricle and the outer surface of the inner membrane. The inner membrane also defines a neo-ventricular chamber that is in contact with blood simulating fluid. A pulsatile flow pump can serve as a hydrodynamic driver for inflow and outflow into and out of the compression sac. This can exert a concentric force that compresses the inner sac and displaces the simulated blood residing in the neo ventricular cavity simulating systole. The fluid can then return back from the compression sac to the pump allowing the neo-ventricle to distend to accommodate returning simulated blood from the atrium simulating diastole.

A continuous flow reaction device (100) for an electrochemical process comprising: a reaction space (110), a pumping system (200) configured to generate a pulsatile flow, a plurality of discrete protrusions (120,a: 120,b) each configured such that a flow path (150a-150c) of the fluid contacting an inlet end (14) side of the discrete protrusion is split at least into two daughter flow paths (150b1; 150b2) on the outlet end (16) side of the discrete protrusion (120,a: 120,b); and the discrete protrusions (120,a: 120,b) being arranged so that at least one of the daughter flow paths (150b1) generated by one of the plurality of discrete protrusions (120) combines (152a) with at least one of the daughter flow paths (150a2) generated by another of the plurality of discrete protrusions (120) on the outlet end (16) side of both discrete protrusions (120) and wherein each (and every) discrete protrusion (120) is an electrode in the electrochemical process.

The invention relates to the technical field of medical instrument volume detection, and discloses a medical instrument internal volume detection system. A continuous wave and a pulse modulation signal are simultaneously transmitted through an annular phased array microwave antenna array, three-dimensional dielectric constant distribution is reconstructed by adopting a compressed sensing algorithm, and Doppler time-frequency domain characteristics are extracted through short-time Fourier transform; and inputting the phase gradient field and Doppler velocity field features into a convolutional neural network to generate a four-dimensional space-time volume evolution model, separating a macroscopic volume trend and a microcosmic pulsation component by adopting an adaptive Kalman filtering algorithm, and predicting an abnormal hemodynamic event through a long-short-term memory network. The technical problem of real-time precise detection of the multi-dimensional volume parameters of the blood circulation medical instrument under the complex pulsating flow condition is solved, and accurate evaluation of the instantaneous volume value, the pulsation amount and the pulsating frequency spectrum and early warning of abnormal events are achieved.

The utility model belongs to the technical field of gas meter detection equipment, and particularly relates to an ultrasonic gas meter pulsating flow durability evaluation device. The pulsating flow durability evaluation device for the ultrasonic gas meter comprises an evaluation inlet pipe, a branch pipe, a pressure regulating pipeline mechanism, a first confluence pipe, a to-be-tested mechanism, a second confluence pipe and a return pipeline, the inlet end of the evaluation inlet pipe is communicated with an external fuel gas access pipeline, and the outlet end of the evaluation inlet pipe is communicated with the side wall of the branch pipe; the pressure regulating pipeline mechanism comprises a plurality of pressure regulating pipelines capable of evaluating the meter to be tested; the inlet ends of the plurality of pressure regulating pipelines are all communicated with the branch pipe, and the outlet ends of the plurality of pressure regulating pipelines are all communicated with the first confluence pipe. According to the utility model, natural gas with different pressure grades or different vibration working conditions is simulated in different passages, and after the natural gas circularly enters the gas meter for a certain period, whether the metering performance of the gas meter still meets the requirements is evaluated, and the durability of the ultrasonic gas meter can be detected.

An implantable LVAD is provided that includes a pump shaped so as to define a pump chamber. The pump includes a tubular linear motor, which includes a magnetic piston, which includes a reciprocating one-way valve configured to allow downstream blood flow and inhibit upstream blood flow; and a stator, which is configured to magnetically drive the magnetic piston with reciprocating motion, so as to pump blood downstream during downstream motion of the magnetic piston while the reciprocating one-way valve is closed. The pump further includes a spring, which is arranged to store energy during upstream motion of the magnetic piston and release the stored energy during the downstream motion of the magnetic piston. Control circuitry is configured to activate the tubular linear motor to provide pulsatile flow synchronized with cardiac cycles. Other configurations are also described.

An implantable LVAD system includes an implantable LVAD including an outflow cannula, which is couplable in fluid communication with a circulatory system of the patient at a first site; and an inflow cannula, which is couplable in fluid communication with the circulatory system at a second site upstream of the first site. The LVAD further includes a continuous-flow pump includes a first inlet in fluid communication with the inflow cannula, and a first outlet. The LVAD still further includes a pulsatile-flow pump includes a second inlet in fluid communication with the first outlet of the continuous-flow pump, and a second outlet in fluid communication with the outflow cannula. Control circuitry is configured to activate the continuous-flow pump to provide flow without synchronization with cardiac cycles of a heart of the patient, and activate the pulsatile-flow pump to provide pulsatile flow synchronized with the cardiac cycles. Other embodiments are also described.

The invention relates to the technical field of gas metering, and discloses an ultrasonic gas meter time sampling method aiming at pulsating flow influence, comprising the following steps: S1, setting a basic acquisition period and random sampling related parameters; s2, sampling time is dynamically generated through a random algorithm, and interference matching of a fixed period is avoided; s3, collecting instantaneous flow at the generated random sampling time point; s4, abnormal value detection and elimination are carried out on the collected instantaneous flow data; s5, correcting the flow data after the abnormity is eliminated, and calculating the corrected instantaneous flow; and S6, outputting the corrected instantaneous flow, and adjusting random sampling parameters and exception handling rules based on historical data feedback. According to the method, through a dynamic adjustment method in combination with the flow fluctuation amplitude, the sampling time distribution is more flexible and uniform, different flow modes are adapted, the influence of periodic interference on the sampling data can be remarkably reduced, and the accuracy and the stability of instantaneous flow sampling are improved.

A pump system is provided comprising a diaphragm fluid pump which can be fluidically connected to a heart and / or at least one blood vessel by means of an inlet cannula and an outlet cannula and is adapted for generating a pulsatile fluid flow for supporting a cardiac activity of the heart, a working pressure source connected to the diaphragm fluid pump by means of a pressure line and adapted for providing a working pressure for driving the diaphragm fluid pump, a control unit adapted for controlling the working pressure, a first flow sensor adapted for detecting a first cannula flow signal corresponding to an inlet flow in the inlet cannula or an outlet flow in the outlet cannula, a working pressure sensor adapted for detecting a working pressure signal corresponding to the working pressure in the pressure line.

The utility model discloses a fuel gas rectifier and a flow meter. The fuel gas rectifier comprises a hollow cylindrical part, the mounting ring is arranged on the outer end face of the cylindrical part; a plurality of shunting channels which extend in the length direction of the cylindrical part and are not communicated with one another are uniformly distributed in the cylindrical part; according to the flow meter, after the gas medium entering the flow meter is rectified by the rectifier, pulsating flow energy existing in fluid is completely dispersed, the fluid is transited to a laminar flow state from a turbulent flow state, the influence of pulsating flow is eliminated, and the flow meter has the advantages of being simple in structure, convenient to use and high in efficiency. Therefore, the fluid detection effect of the ultrasonic flowmeter is effectively improved.

Methods and systems for delivery of pulsated air to a user using a device including a flow generator to generate a continuous air flow, a first actuator comprising a pulsated flow delivery mechanism configured to generate a pulsated air flow from the continuous air flow based on a pre-determined duty cycle to vary a frequency of the pulsated air flow, a user interface configured to generate and deliver vortices of pulsated air to the user at the frequency of the pulsated air flow, and a set of tubing to couple the flow generator, the first actuator, and the user interface.

This invention relates to a ball-operated plugging device for downhole pulsating hydraulic fracturing, comprising a main body assembly. A conical valve seat is disposed in the middle of the main body assembly, and an umbrella-shaped valve is slidably connected within the conical valve seat. The umbrella-shaped valve includes a valve head boss and a valve stem. A self-excited oscillation chamber is also provided at the bottom of the conical valve seat. A spring support seat is disposed below the self-excited oscillation chamber, with a central circular hole at the geometric center of the spring support seat. A spring is placed on the spring support seat, and the top of the spring contacts the valve head boss of the umbrella-shaped valve. A through-hole flow channel is provided in the middle of the umbrella-shaped valve, with its upper and lower ends communicating with cavity A and cavity B, respectively. The valve stem of the umbrella-shaped valve passes through the spring, and its bottom is inserted into the central circular hole of the spring support seat. A spherical groove is provided at the top of the umbrella-shaped valve for placing a soluble plugging ball. This invention can adjust the pressure variation of the pulsating fluid at the bottom of the well during construction.

The present application provides a kind of vascular anastomat performance testing device and method, for evaluating the performance of vascular anastomosis in tensile property and leakage property.The device includes a simulated blood flow part, a loading test part and an anastomosis experiment part.The simulated blood flow part includes a centrifugal pump, a solenoid valve, a temperature transmitter, a pressure transmitter, a flowmeter, a throttle valve, a heater and a liquid tank, for simulating the physical characteristics of actual blood pulsatile flow, the loading test part is used to evaluate the characteristics of the anastomosis performance of the anastomosis under load.The anastomosis experiment part can be used for vascular anastomosis experiment and leakage property evaluation in this part, to detect the leakage of anastomat in simulated blood flow circuit.The present application can comprehensively evaluate the performance of vascular anastomat, and provide reliable test data for clinical application.

Disclosed in the present invention are a method and system for predicting a pressure drop loss of a rotary ball valve under a pulsating flow. The method comprises: establishing an equivalent model of a rotary O-shaped ball valve flow channel, wherein the equivalent model comprises four throttling elements, i.e., a thick orifice plate, thin orifice plates, a Z-shaped bent pipe, and upstream and downstream straight pipe sections at ball valve pressure measuring points; acquiring pulsating fluid speeds and pulsating instantaneous flow rates in the throttling elements, and on the basis of the pulsating fluid speeds and the pulsating instantaneous flow rates, calculating pulsating pressure drop losses corresponding to the throttling elements; and on the basis of the pulsating pressure drop losses of all the throttling elements, calculating the total pressure drop loss of a rotary ball valve under a pulsating flow. The method provided by the present invention can improve the calculation efficiency when the pressure drop loss is predicted.

The invention relates to a high-viscosity fluid pulsating flow UHT sterilization system and method, the system belongs to an active enhanced heat transfer technology, parameters of a frequency converter are set through a control unit, and the frequency converter controls a material centrifugal pump to apply pulsating flow to materials. A large number of vortexes are generated on the wall face through pulsation of fluid, a viscous bottom layer is damaged, the turbulence degree of mainstream fluid is increased, a thermal boundary layer is damaged, the effect of enhancing heat exchange is achieved, and a heating unit of a high-viscosity UHT system is optimized. A proper pulsation frequency is matched under different viscosities and flows of materials, the turbulence level of high-viscosity fluid is increased under the action of pulsating flow, the materials are indirectly heated in the plate heat exchanger, sterilization lasts for 2-8 seconds in the sterilization pipe, and the materials are collected through the material recovery tank after being cooled.

The present application discloses a blood pump speed pulsation control method, system, and related products. The method: based on the electrical signal change information of the blood pump motor within a historical period, detects the start time of the N0 diastole and the start time of the N0 systole of the current patient's heart beat within the historical period; based on these start times, determines the start time of the N1 diastole and the start time of the N1 systole of the heart after the historical period. The method uses the patient's individual historical electrical signal change information as a basis to determine the future start time of the diastole and the start time of the systole of the current patient's heart, ensuring that the speed adjustment time of the blood pump motor is personalized to conform to the physiological contraction law of the individual heart, and realizing the specific output of the blood pump such as the blood pumping time and the blood pumping volume per time to flexibly follow the blood flow pulsation output of the heart beat, that is, to assist the blood pump in generating a pulsating flow synchronized with the natural heart beat, thereby effectively and reliably maintaining the patient's life safety.

Implanted devices and associated methods of treatment for treating hypertension are provided herein. Such an implant device is configured to be placed in a target region of an aortic arch of a patient to sufficiently stretch an arterial wall in the target region to cause a pressure reflex. Typically, the implant is designed to stretch a target region within the aortic arch by at least 20%, and still allows the arterial wall to be exposed to pulsating flow and allows lateral blood flow into the secondary branch artery. The implant may include two or more expandable structures interconnected in series by an axially expandable flexible connection to accommodate the curvature and complex geometry of the aortic arch to anchor the implant in the aortic arch while appropriately stretching the target region. The target region includes a cylindrical section of the aortic arch between the left common carotid artery and the left subclavian artery.

The invention relates to a valve pulsating flow test system which comprises a circulation test loop, a heart simulation system and a pulsating pump, the circulation test loop comprises a first simulation system, a test channel, a second simulation system and a water return channel which are connected in sequence, and gate valves are arranged at the two ends of the test channel; the test channel can be detachably installed between the first simulation system and the second simulation system in a forward or reverse mode, the test channel comprises a flowmeter assembly detachably installed at the water inlet end of the test channel, and the first simulation system comprises a first simulation cavity. The one-way valve can be detachably mounted on the first simulation cavity in a forward or reverse manner; the heart simulation system is connected with the first simulation system; the pulsating pump is connected with the heart simulation system. According to the invention, rapid switching of the installation directions of the one-way valve and the flowmeter can be realized, the test requirements of different types of test samples can be met, and the test efficiency is further improved.

The utility model discloses a valve-controlled pulsating flow generating device and a valve-controlled pulsating flow generating system. The device comprises a first water tank, a pulsating flow generation structure, a first valve, an overflow structure, a second water tank and a second valve, a water outlet of the first water tank is connected with a water inlet of the second water tank through a first pipe section; a water outlet of the second water tank is connected with a water inlet of the first water tank through a second pipe section; the first water tank and the second water tank are used for storing liquid; the pulsating flow generation structure is connected into the first pipe section, is located on the side close to the first water tank and is used for enabling liquid flowing out of the first water tank to generate pulsating flow; the overflow structure is arranged between the first pipe section and the second water tank and used for enabling liquid flowing into the second water tank to be in a stable state; the first valve is arranged on the first pipe section and located between the overflow structure and the pulsating flow generation structure. The second valve is arranged on the second pipe section; the first valve and the second valve are both used for controlling flowing of liquid in the corresponding pipe sections. According to the scheme, pulsating flow can be generated.

An apparatus for generating a controlled pressure pulsatile flow includes: a fluid flow path extending from a reservoir to an application; a primary pump disposed in the fluid flow path downstream of the reservoir; a reference pump; a variable speed electric motor coupled to the reference pump; a bleed orifice connected in fluid communication with the reference pump; a pressure relay device configured to communicate a reference pressure from the reference pump to the fluid flow path; and an electronic controller configured to selectively supply electric power to the electric motor so as to generate a pulsatile fluid flow in the fluid flow path.

A dampening device includes a housing including an inlet and an outlet, and a section of compliant tubing extending through the housing between the inlet and the outlet. A first portion of the housing is movable relative to a second portion of the housing to vary fluid flow characteristics within the section of compliant tubing. A dampening device includes a housing defining an interior volume, wherein the housing includes an inlet and an outlet, and an actuation mechanism configured to change the interior volume thereby changing fluid flow characteristics through the housing. A method of smoothing a pulsatile fluid flow includes coupling the dampening device to an inflow line, activating the fluid pump, wherein the section of compliant tubing expands within the housing to smooth out the pulsatile fluid flow, and selectively moving a first portion of the housing relative to a second portion to vary fluid flow characteristics.

The present application discloses a blood pump flow adaptive control method, system and related products. The embodiments of the present application use the patient's individual historical electrical signal change information as a basis to determine the start time of the diastole and the start time of the systole of the current patient's heart in the future, which can ensure that the speed adjustment time of the blood pump motor is personalized and conforms to the physiological contraction law of the individual heart; wherein, the start time of the current beating period is determined according to the duration of one single historical beating period, and the start time of the next beating period is detected within the latest corresponding duration of the current beating period, which can achieve the specific outputs of the blood pump such as the blood pumping time and the blood pumping volume each time to flexibly follow the blood flow pulsation output of the heart beat in real time, that is, to assist the blood pump in generating a pulsating flow synchronized with the natural heart beat, thereby effectively and reliably maintaining the patient's life safety.

A lower header of an inlet is divided into a left header and a right header through a partition plate, a left heat exchange tube is communicated with the left header, a right heat exchange tube is communicated with the right header, and the left header and the right header are provided with a left inlet and a right inlet respectively. The fluid flow of the left inlet and the right inlet can be independently controlled, and the fluid entering the left header and the right header is pulsating flow with continuously changing flowing speed. The pulsating flow continuously impacts the fluid in the cavity of the baffle plate, so that the fluid is continuously disturbed, and heat transfer is further enhanced.

A vascular simulator based on pulsatile flow control and a method for controlling same are disclosed. The control method according to the present disclosure may comprise the steps of: acquiring pressure sensing information of an artificial blood vessel outlet region due to the flow of artificial blood through a pressure sensor corresponding to the artificial blood vessel outlet region; identifying an outlet pressure corresponding to the artificial blood vessel outlet region on the basis of the pressure sensing information; if the outlet pressure is identified, identifying whether the outlet pressure matches a preset condition; and if the outlet pressure does not match the preset condition, controlling a valve corresponding to the outlet such that the outlet pressure matches the preset condition.

A pump valving assembly for a pulsatile fluid pump includes a pumping chamber, an inlet port, and an outlet port. The pump valving assembly further includes an inlet spherical check valve assembly, first and second tapered tubes disposed between the inlet port and the pumping chamber, an outlet spherical check valve assembly, and third and fourth tapered tubes disposed between the pumping chamber and the outlet port. The first tapered tube expands in cross-sectional area from the inlet port to the inlet spherical check valve assembly, and the second tapered tube contracts in cross-sectional area from the inlet spherical check valve assembly to the chamber. The third tapered tube expands in cross-sectional area from the chamber to the outlet spherical check valve assembly, and the fourth tapered tube contracts in cross-sectional area from the outlet spherical check valve assembly to the outlet port.

A system for simulating cardiovascular fluid flow having a target fluid flow profile, which has target pulsatile flow and target systemic resistance components, in a test member is disclosed. The system includes a reservoir, a pump, input and output channels, a first valve in the input channel, a second valve in the output channel, and a processor. The input and output channels are connectable to the test member so as to form a fluid circuit with the test member. The processor is configured to execute a method for controlling the first valve to generate the target pulsatile flow component in the input channel, and controlling the second valve to generate the target systemic pressure component. Other systems are also disclosed. Methods for simulating target fluid flow profiles in a test member are also disclosed.

A pump includes: a first pump body defining a first flow path; a first inlet check valve at an upstream end of the first flow path; a first outlet check valve at a downstream end of the first flow path; a first compressible container in flow communication with the flow path between the upstream and downstream ends; a first electromagnetic linear motor connected to the first compressible container such that extension of the first linear motor causes compression of the first compressible container; and an electronic controller configured supply a varying voltage or current to the first linear motor so as to provide a pulsatile flow at a controlled pressure and controlled pulse rate, where the pressure is independent of downstream flow resistance.

The utility model relates to the technical field of water pump pulsation monitoring, in particular to a water pump pulsation monitoring unit which comprises a water pump body composed of a pump body motor and a volute, a vibration sensor is fixedly installed on the inner side of a hollow ring, and a first pressure sensor is fixedly installed on the top of a water inlet pipe. A flow sensor is fixedly installed at the bottom of the water inlet pipe, a second pressure sensor is fixedly installed outside the water drainage pipe, and an electromagnetic flowmeter is fixedly installed at the top of the water drainage pipe. According to the water pump pulsation monitoring unit, vibration data of the transmission shaft are detected through the eddy current sensing probe of the vibration sensor, data support is provided for pressure pulsation data analysis, and water pressure and flow velocity data of the water inlet pipe are detected through the first pressure sensor and the flow sensor; and then the second pressure sensor is used for detecting water pressure data at the drainage pipe, pulsating flow data are rapidly detected through the electromagnetic flowmeter, and the data accuracy is improved through comparative analysis.