19 results about "Venous blood flow" patented technology

Vascular blood flow modulation is disclosed using metallic compliance-enhancement devices that contain a sealed volume of fluid. The device includes a first elongated inflatable nitinol balloon and a second elongated inflatable nitinol balloon, each having an outer sealed terminus and an inner open fluid port, and a nitinol connector tube that fluidly couples the balloons and has a diameter smaller than the inflated diameters of the balloons. The first balloon is positioned within an arterial vessel and the second balloon is positioned within a venous vessel, with the connector tube spanning between the vessels. During systole, arterial pressure compresses the first balloon to drive fluid through the connector tube into the second balloon, thereby expanding the second balloon and increasing venous blood flow. Cyclic systolic and diastolic pressure variations cause fluid to shuttle between the balloons, producing a compliance-enhancing effect.

The utility model discloses a vein double-layer covered stent which comprises a stent body, the stent body is of a tubular structure with a hollow tube wall, the whole stent body is lined with a double-layer covered film matched with an inner cavity of the stent body, a covered film cavity is formed between the double-layer covered film, and the covered film cavity is a cylindrical sealed cavity. The utility model is used for stent implantation after the patient with the pressed or blocked iliac vein is opened or the balloon is expanded, and conforms to the vein blood flow while keeping the iliac vein unobstructed for a long time, so as to relieve the obstruction of the outflow tract and maintain the unobstructed iliac vein for a long time.

The present invention discloses a method and a device for detecting low-speed blood flow Doppler signals through a wall filter. The device includes two wall filters, two autocorrelation processing modules, two blood flow detection modules, a low-speed blood flow detection module, and a scan conversion module. The two wall filters adopt different numbers of filtering stages, and the two wall filters perform wall filtering on the detection signals of the Doppler ultrasound device. The method and device of the present invention can automatically adjust the number of wall filter stages according to the proportion of newly added effective blood flow points, improving the accuracy of detecting low-speed blood flow, such as venous blood flow. It is particularly meaningful when the operator of the Doppler ultrasound device lacks experience, and can help the operator obtain accurate blood flow images and effectively avoid misdiagnosis.

SOLUTION: The present invention relates to a rehabilitation system for lower or upper limbs. A limb rehabilitation system comprises an ankle-assist or wrist-assist rehabilitation device (300) and an intermittent pneumatic compression (IPC) device (305). The limb rehabilitation device (300) which is constituted by a soft elongation actuator assembly (410) is operable so as to minimize joint contracture, while the IPC device (305) is operable so as to increase venous blood flow in a patient at risk and contribute to the prevention of deep vein thrombosis and pulmonary embolism. For lower-limb rehabilitation, the rehabilitation device (300) assists dorsiflexion and plantar flexion, as well as eversion or inversion of the ankle, to improve mobility of the ankle of the user.SELECTED DRAWING: Figure 3B

The invention relates to the technical field of intelligent wearing health monitoring, in particular to an intelligent sock and a deep vein thrombosis early warning method. The intelligent sock comprises a sock body, an air pump and a control device, an air bag is arranged on the inner side of the sock body, and a pressure sensor is arranged on the inner side of the air bag; a temperature sensor and a blood flow velocity sensor are arranged on the inner side of the sock body; the air pump, the pressure sensor, the temperature sensor and the blood flow velocity sensor are all electrically connected with the control device; the control device is used for calculating a deep venous thrombosis risk index according to the pressure, monitored by the pressure sensor, applied to the body surface of the user by the air bag, the skin temperature monitored by the temperature sensor and the venous blood flow speed monitored by the blood flow speed sensor, and sending out an early warning signal when the deep venous thrombosis risk index is larger than a preset early warning threshold value. The problem that a traditional stretch sock can only provide static pressure support and lacks monitoring capacity is solved, and quantitative evaluation and dynamic analysis of the DVT risk are achieved.

A lower or an upper limb rehabilitation system is described. The limb rehabilitation system includes assisted-ankle or assisted-wrist rehabilitation device (300) and an intermittent pneumatic compression (IPC) device (305). The limb rehabilitation device (300) is made up of soft extension actuator assemblies (410) that are operable to minimise joint contracture, while the IPC device (305) is operable to increase venous blood flow in at-risk patients to help prevent deep vein thrombosis and pulmonary embolism. For lower limb rehabilitation, the rehabilitation device (300) provides assisted ankle dorsiflexion-plantarflexion and eversion-inversion to improve users' ankle mobility.

The utility model discloses a novel device for preventing lower limb venous thrombosis of a bedridden patient, which comprises a rack assembly, a vibration assembly, a surrounding movement assembly and an inflation assembly, the vibration assembly, the surrounding movement assembly and the inflation assembly are all arranged in the rack assembly, the surrounding movement assembly is arranged above the inflation assembly, and the inflation assembly is arranged above the surrounding movement assembly. A vibration assembly is installed behind the surrounding movement assembly, the lower limbs of a patient are placed in the inflatable foot sleeve, the inflatable foot sleeve conducts intermittent pneumatic repeated compression movement on the lower limbs of the patient through an air pump, the venous blood flow speed of the patient is increased, blood agglutination is prevented, and deep venous thrombosis and pulmonary embolism are prevented. After the patient wears the inflation assembly on the leg, the leg is placed in a positioning soft groove in the surrounding assembly or placed above the vibration assembly, the surrounding movement assembly conducts clockwise rotation movement and anticlockwise rotation movement to simulate back stretching, toe flexion and surrounding movement of the ankle joint of the human body so as to prevent thrombus, and the vibration assembly is used for promoting blood circulation. And thrombus is prevented.

Apparatus and methods are described including reducing cardiac preload of a subject by partially occluding a vena cava of the subject at an infra-renal location. One or more physiological parameters of the subject are monitored, the one or more physiological parameters including lower body venous pressure, central venous pressure, central venous blood flow, renal venous pressure, cardiac diameter, cardiac volume, arterial pressure, and / or arterial blood flow. An extent to which the vena cava is occluded at the infra-renal location is modulated, responsively to the one or more physiological parameters. Other applications are also described.

The utility model discloses an extracorporeal circulation blood path for hemodialysis and blood perfusion, which belongs to the technical field of medical instruments and comprises an arterial blood path and a venous blood path, and the arterial blood path comprises an aorta tube, a pump tube, an arterial pot inlet tube, an arterial pot outlet tube and an arterial pressure monitoring tube which are arranged along the flowing direction of arterial blood; the venous blood path comprises a venous pot inlet pipe, a venous pot outlet pipe, a hemodialyzer pipe and a venous pressure monitor which are arranged in the flowing direction of venous blood. The hemoperfusion device blood path comprises an artery connecting pipe, a vein connecting pipe, a waste liquid drainage pipe, an arteriovenous circulation pipe and a waste liquid bag connecting pipe. By means of the mode, connection needed by blood perfusion and connection needed by other blood purification modes (such as hemodialysis) are integrated together, medical staff do not need to splice various complex independent pipelines during operation, the operation process is simplified, and the hemodialysis efficiency is improved.

A compression garment (1) for post-liposuction patients integrates real-time monitoring and therapeutic intervention to prevent deep vein thrombosis (DVT) and embolism. The stretchable, biocompatible garment applies 20-30 mmHg of compression and comprises of blood oxygen saturation (SpO2) sensors (2), respiratory rate sensors (3), and motion / posture sensors (4). A Doppler ultrasound transducer system (50) monitors venous blood flow, while a biochemical patch detects D-dimer levels in sweat or micro-lacrimal samples. Pneumatic micro-bladders cyclically inflate to promote venous return upon detecting elevated embolism risk. A detachable control module (5) processes sensor data, computes a risk index using AI-driven analytics, and triggers alerts via haptic or wireless communication to external devices or hospital EMR systems.

The invention discloses a device capable of continuously monitoring and preventing lower limb venous thrombosis and a control method thereof, the device comprises a signal acquisition device, a controller and a host, the signal acquisition device can continuously monitor target venous blood flow dynamics and muscle electric signal changes of human lower limbs, and can electrically stimulate lower limb muscles; the controller can transmit a control instruction sent by the host to the signal acquisition device, and can convert an ultrasonic analog signal and a myoelectricity analog signal into a high-quality ultrasonic image and a specific numerical value of an action potential; the host can send a control instruction to the controller, calculate the blood flow speed and the inner diameter value of a target vein according to the ultrasonic digital signal processed by the controller, monitor and display the blood flow speed and the inner diameter value of the target vein together with the high-quality ultrasonic image and the specific numerical value of the action potential, and select a corresponding electrical stimulation scheme. According to the invention, real-time monitoring and individualized precise prevention of lower limb venous hemodynamics are realized, and powerful support is provided for reducing the incidence rate of clinical lower limb venous thrombosis and pulmonary embolism.

The invention relates to the technical field of medical instrument control, and discloses a self-adaptive control method and system for percutaneous nerve stimulation equipment. The method comprises the following steps of: recording an electric stimulation pulse ending moment as a time sequence reference point, setting a starting moment of a sampling time window as delay time after the time sequence reference point, and shielding signal acquisition in an electric stimulation pulse duration and the delay time; the optical sensing module only collects photoelectric volume pulse wave signals in a stable period after mechanical tremor and calm of muscles; effective signal segments in adjacent sampling time windows are used as interpolation nodes to carry out interpolation fitting on the waveform in the shielded period so as to reconstruct a continuous vein blood flow waveform; and extracting the vein filling time VRT from the reconstructed waveform, and adjusting the stimulation interval time of the next period according to the deviation value between the VRT and the current stimulation period T. According to the method and the device, automatic matching of the stimulation frequency and the vein filling physiological rhythm of the user is realized while motion artifact interference is avoided.

The invention relates to the technical field of venous thrombosis data monitoring, in particular to a pregnancy venous thrombosis intelligent monitoring method and system.The pregnancy venous thrombosis intelligent monitoring method comprises the following steps that pregnancy venous blood flow data is collected, dynamic indexes of blood flow velocity, blood pressure and blood viscosity are obtained, whether the dynamic indexes fluctuate within a set steady-state range or not is judged by setting the steady-state range, and if yes, the pregnancy venous thrombosis is monitored. And generating feature data of pregnancy health monitoring. According to the method, by dynamically monitoring the indexes such as the pregnancy blood flow speed, the blood pressure and the blood viscosity, the change trend of the vein blood flow state can be efficiently recognized, and in the state transition process, the high-risk blood flow state can be recognized in advance and intervened in time according to the weight analysis of the transition frequency and the duration time between the blood flow states. In addition, by analyzing the blood flow state transition trend, the deviation direction and fluctuation amplitude of the high-risk state can be recognized more visually. The blood flow dynamic characteristics closely related to the high-risk state are screened, and irrelevant redundant information is eliminated, so that characteristic analysis is more specific.

The invention discloses a composite functional oversleeve for assisting a blood cell separator in blood sampling, relates to the technical field of medical auxiliary tools, and aims to solve the problem that one of the core factors influencing the blood sampling speed is the blood flow of peripheral veins, and the blood flow is influenced by blood vessel conditions, limb temperature, vasomotor state and the like. The compression force of the tourniquet is uncontrollable, and the risk of nerve injury exists after long-time use; the temperature of the hot-water bag is uncontrollable, scalding is prone to happening or quick cooling is achieved, and constant temperature cannot be maintained. The fist-clenching action is irregular, a patient is prone to fatigue, and a continuous and stable blood flow promoting effect cannot be provided. The invention provides a composite functional oversleeve for assisting blood sampling of a blood cell separator, which comprises an oversleeve, and the oversleeve comprises a compression assembly, a main body temperature increasing assembly and a tail end flow promoting assembly which are connected in sequence; a puncture window is arranged on the main body warming assembly, the functions of pressurization, heat preservation and passive holding are integrated, the limb blood flow state and the compression pressure are sensed in real time, intelligent adjustment is achieved, and the device is matched with the blood sampling process of a blood cell separator.

The invention belongs to the technical field of medical teaching models, and particularly relates to an interactive human anatomy head and neck venous return model and a display method thereof. The model comprises a locally transparent head and neck model and a control base. A plurality of LED flexible light bars are arranged in the model according to an anatomical path and are used for simulating main vein blood vessels such as a head-arm vein, an internal jugular vein, a facial vein and a cavernous sinus. According to the control module, through the user interface design of a liquid crystal screen, on one hand, a structural flow chart is organized according to the time-space sequence of venous return, and the navigation effect of autonomous learning of students is achieved; on the other hand, the on-off, the flowing direction and the time sequence of each light bar can be independently controlled through a text button on the liquid crystal screen, so that the vein blood flow direction is dynamically demonstrated. The model can also visually display related clinical cases through touch pressure feedback, can dynamically display the blood flow direction, supports interactive operation, can simulate the clinical pathological process, and is higher in interactivity.

The utility model discloses a kind of extracorporeal circulation systems, it is related to medical instrument technical field.Extracorporeal circulation system includes the inflow pipe, handle and outflow pipe connected in turn, inflow pipe is used to connect carotid artery, outflow pipe is used to connect vein;Handle includes shell and the flow through switch, flow through regulator and blood filter being set in shell.In application when inflow pipe is connected into carotid artery, outflow pipe is connected into vein, high-pressure arterial blood flow and low-pressure venous blood flow form pressure difference, make the blood flow of carotid artery reverse flow to vein, establish the blood retrograde passage from carotid artery to vein, can be opened and closed above-mentioned retrograde passage by flow through switch, utilize flow through regulator to adjust the flow rate and flow of blood flow, and utilize blood filter to intercept thrombus and other accumulations falling in interventional operation, reduce the problem that thrombus and other accumulations enter brain with blood and cause cerebral apoplexy or embolism.

1. Name of the product in this design: Arterial and Venous Blood Flow Simulator. 2. Purpose of this design: To provide a device for simulating arterial and venous blood flow in medical training. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The present invention discloses an infusion pump status detection device and method for simulating clinical scenarios, which relates to the field of medical device detection technology. The device includes: a simulated venous blood vessel circuit, a simulated clinical venous infusion circuit and a device connection channel. When in use, the device to be tested is connected; the power pump, the pipeline filling valve and the flow control valve 4 are started to fill all pipelines with liquid from the liquid storage chamber; the flow control valve 1 or the flow control valve 2 or the flow control valve 3 are opened to simulate the venous blood flow circulation and the clinical venous infusion scenario respectively through the simulated venous blood vessel circuit and the simulated clinical venous multi-channel infusion circuit; after the simulated venous blood vessel circuit and the simulated clinical venous infusion circuit are running stably, the electronic balance records the initial mass of the liquid storage chamber and the mass change of the liquid storage chamber after the device to be tested is started, and the mass change is converted into volume flow rate through the density relationship, and compared with the infusion setting value and display value on the device to be tested to detect the operating status of the infusion pump.

The invention relates to the technical field of biomedical imaging, and discloses a noninvasive hemodynamic monitoring method and system based on photoacoustic-ultrasonic imaging. The method comprises the steps that noninvasive hemodynamic monitoring is executed based on a photoacoustic image and an ultrasonic image, and the noninvasive hemodynamic monitoring comprises the steps that an arterial pressure waveform is obtained by analyzing displacement of arterial blood vessels or intensity changes of preset pixel points in a photoacoustic image or ultrasonic image sequence; the vein blood flow speed is evaluated by analyzing the inter-frame similarity change of a preset pixel area of a vein area in the ultrasonic image sequence; external stimulation is applied to the monitored part to establish a dynamic blood flow state, the change of the diameter of the blood vessel is measured based on the photoacoustic image or the ultrasonic image, and the blood vessel compliance is evaluated in combination with pressure information; according to the invention, non-invasive and integrated monitoring of arterial pressure waveform, venous blood flow, blood vessel diameter and compliance can be realized.