64 results about "Arterial blood flow" patented technology

A wearable Doppler blood flowmeter can be used with an inflatable cuff to measure blood flow, such as for assessing peripheral artery disease (PAD). The present approach can include techniques such as providing or using a wearable acoustic Doppler blood flowmeter, without requiring the intricate manipulation of a handheld Doppler probe. The system can select a pair of acoustic transmitter and acoustic receiver from a set of more than two transducers, including one or more of different locations, orientations, or spacings, such as to vary a targeted region. The RF echo response signal can be translated to an audio response signal. An audio response signal injection circuit can adaptively inject a noise or other enhancement signal, such as to help improve perceptibility of an audible characteristic of pulsatile arterial blood flow. A trained machine learning model can be employed to select or adjust operating settings, to assess diagnostic information, or both.

Devices and methods establish and facilitate retrograde or reverse flow blood circulation in the region of the carotid artery bifurcation in order to limit or prevent the release of emboli into the cerebral vasculature such as into the internal carotid artery. The methods are particularly useful for interventional procedures performed through a transcarotid approach or transfemoral into the common carotid artery.

The blood glucose detector (BGD) is placed on user's wrist, ear, nose, or other skin surface, at a NIR light infiltration location to detect arterial blood flow. Earlier-obtained baseline BG data is obtained via BGD and conventionally-obtained BG data. The user-wearable housing or body-mounted BGD system includes processor, memory, and NIR transmitter / sensor. BG baseline data is stored in memory. The NIR transmitter / sensor disposed on infiltration location. In detection, transmitter generates light in predetermined narrow band within NIR range 1350-1800 nm. Sensor detects reflected light from arterial BG as then-detected BG signal. Memory stores a subcutaneous interference factor (SIF) contributory value for NIR narrow band. Onboard processor (or smart phone APP) correlates the detected BG signal with the baseline as modified by the SIF value and generates displayable BG level to user via user-wearable housing or the user interface display on the smart phone as connected to body-mounted BGD system.

The utility model relates to an automatic adjustment hepatic duodenal ligament portal vein and hepatic arterial blood flow on-off device which comprises a soft rubber sleeve, a handle, a connecting pipe, a first clamping strip, a second clamping strip, a rotating shaft, a flexible wire and a flexible wire control mechanism. The first clamping strip and the second clamping strip are sleeved with the soft rubber sleeve, one end of the connecting pipe is connected to the soft rubber sleeve, the other end of the connecting pipe is connected to the handle, the flexible wire control mechanism is arranged on the handle, the flexible wire is inserted into the connecting pipe in a penetrating mode, one end of the flexible wire is connected to the first clamping strip, and the other end of the flexible wire is connected to the flexible wire control mechanism. According to the utility model, the defects of the existing porta hepatis occlusion technology can be overcome, more accurate, safer and more convenient blood flow occlusion and conduction control can be realized, and the surgical risk and liver injury can be reduced.

The application relates to the technical field of rehabilitation, in particular to an upper limb rehabilitation training device which comprises a sleeve, an air bag fixedly connected to the inner side of the sleeve, an air pump communicated with the air bag, fixed ends and movable ends respectively at the two ends of the sleeve, a box body fixedly connected to the outer side of the fixed end of the sleeve, a receiving cavity and a control cavity separated by a partition plate in the box body, a receiving opening formed in the side wall of the receiving cavity, a motor fixedly connected to the inner side wall of the receiving cavity, a reel coaxially fixedly connected to the output shaft of the motor, a connecting rod fixedly connected to the side wall of the reel, and the movable end of the sleeve fixedly connected to the side wall of the connecting rod; a controller arranged in the control cavity, and a probe assembly embedded in the inner side of the sleeve. The sleeve is automatically wound and unwound to replace the traditional magic tape fixing, the air bag pressure is automatically adjusted in cooperation with the controller, the probe assembly is integrated to realize real-time monitoring of arterial blood flow, the problems of traditional pressurized sleeves, such as complicated wearing, easy hooking and displacement, and low pressure control precision, are solved, and the single-person convenient wearing, stable and accurate blood flow restriction training is realized.

A system for assisting with a chest compression treatment being administered to a patient. In one aspect, the system for assisting with chest compression treatment includes at least one sensor configured to measure blood flow data, one or more processors, in communication with the at least one sensor, and an output device configured to provide the output indication to the rescuer. The one or more processors are configured to perform operations including receiving the blood flow data from the at least one sensor, based on the blood flow data, generating arterial blood flow data and venous blood flow data, providing an estimation of chest compression effectiveness based on the arterial blood flow data and the venous blood flow data, the estimation being based on at least one peak comparison of arterial blood flow and venous blood flow, and generating an output indication of the estimation of chest compression effectiveness.

Devices and methods establish and facilitate retrograde or reverse flow blood circulation in the region of the carotid artery bifurcation in order to limit or prevent the release of emboli into the cerebral vasculature such as into the internal carotid artery. The methods are particularly useful for interventional procedures performed through a transcarotid approach or transfemoral into the common carotid artery.

The application provides a recyclable arterial blood flow reduction device, relates to the technical field of interventional medical instruments, and comprises a stent part, a recycling part and a pushing assembly. The stent part comprises a stent body which is wide in the middle and narrow at both ends, and a proximal rod body connected to the proximal end of the stent body. The recycling part comprises a recycling hook connected to the proximal rod body, and a recess is arranged on the side wall of the recycling hook. The pushing assembly comprises a long sheath tube, a sleeve loop catheter slidingly arranged on the long sheath tube, and a clamping piece arranged on the sleeve loop catheter. After the sleeve loop catheter is sleeved on the recycling hook, the clamping piece is connected with the recess, and the sleeve loop catheter is pulled out to take out the blood flow reduction device. The metal elastic sheet is arranged, after the sleeve loop catheter is sleeved on the recycling hook, the recess and the clamping piece are connected together at least in the axial direction, the stent body is moved to the proximal end by pulling the sleeve loop catheter, and the problem that the stent body is difficult to be connected again and the blood flow reduction device is difficult to be taken out is conveniently solved.

Interventional procedures on the carotid arteries are performed through a transcervical access while retrograde blood flow is established from the internal carotid artery to a venous or external location. A system for use in accessing and treating a carotid artery includes an arterial access device, a shunt fluidly connected to the arterial access device, and a flow control assembly coupled to the shunt and adapted to regulate blood flow through the shunt between at least a first blood flow state and at least a second blood flow state. The flow control assembly includes one or more components that interact with the blood flow through the shunt.

Devices and methods establish and facilitate retrograde or reverse flow blood circulation in the region of the carotid artery bifurcation in order to limit or prevent the release of emboli into the cerebral vasculature such as into the internal carotid artery. The methods are particularly useful for interventional procedures performed through a transcarotid approach or transfemoral into the common carotid artery.

The invention discloses a multi-artery coupling wearable continuous blood pressure measuring device and method based on multi-modal sensing, and relates to the technical field of medical monitoring. Existing wearable equipment also has inherent limitations in hardware configuration, and the existing devices are generally limited to collection of peripheral signals of a single position; the sensor layout cannot acquire multi-modal physiological signals which are necessary for constructing a high-fidelity hemodynamic model and are distributed at different anatomical positions. The first purpose of the invention is to provide a blood pressure measuring device which has a specific sensor layout and is specially designed to be used for synchronously acquiring central artery blood flow information and peripheral artery pulse signals required for realizing the method, so that hardware support is provided for high-precision personalized blood pressure estimation. The second purpose is to provide a blood pressure measuring method which is based on 0D and 1D hemodynamic models, central and peripheral multi-mode signals can be fused, and the defects of an existing algorithm are overcome.

The present invention discloses a method, system, medium and electronic equipment for silent marking of magnetic resonance arterial blood flow, which belongs to the field of magnetic resonance technology. In the marking cycle, the present invention uses a triangular gradient to replace the traditional layer-selected trapezoidal gradient, and also replaces the triangular reconvergence gradient, and the average gradient required for the blood flow reversal condition is achieved by the difference between paired triangular gradients with positive and negative amplitudes. Similarly, in the control cycle, a triangular gradient is also used to replace the trapezoidal gradient and triangular gradient in the traditional practice, but the average gradient of the triangular gradient sequence is controlled to zero. The present invention uses a non-reconvergence gradient to achieve magnetic resonance arterial blood flow marking, which can greatly reduce the acoustic noise of blood flow marking.

The present invention, in some embodiments thereof, relates to methods and / or apparatus for measuring the effectiveness of a renal denervation treatment. In some embodiments, a method for determining effectiveness of the denervation treatment comprises tracking at least one of arterial wall movement, arterial blood flow rate, arterial blood flow velocity, blood pressure and arterial diameter at one or more selected locations in the renal artery over time, and assessing the effectiveness of said renal denervation treatment according to results obtained by tracking.

The invention discloses a noninvasive ICP detection and regulation system which comprises a transcranial Doppler monitoring module, an intraocular pressure sensing module, a tympanic membrane pressure monitoring module, an abdominal pressurization regulation module, a data fusion processing module, an alarm module and a power management module. The monitoring modules collect intracranial artery blood flow velocity waveforms, intraocular pressure pulsation and external auditory canal pressure fluctuation signals respectively and transmit the signals to the data fusion processing module for comprehensive analysis to generate an ICP evaluation result. When the evaluation value exceeds the preset range, the alarm module is triggered, and an instruction is sent to the abdomen pressurization regulation and control module to regulate the abdomen pressure. And the power management module supplies power to each module. According to the system, the detection accuracy is improved through multi-signal fusion, a monitoring-regulation closed-loop mechanism is formed, manual operation is not needed, the response time is shortened, and the regulation consistency is ensured.

The invention discloses a pneumatic pressurization control method and system for an electronic sphygmomanometer and a related device, which are used for improving the comfort of a tested person and the measurement safety and improving the measurement efficiency of a blood pressure measurement process on the whole. The method comprises the following steps: carrying out component separation on a photoelectric volume pulse wave signal to obtain a pulsation component reflecting the periodic change of arterial blood flow, and constructing an amplitude feature sequence updated along with a pressurization process; calculating the attenuation rate of the amplitude feature sequence relative to the reference sequence in the current pressure interval; constructing a nonlinear response trend model of the pulse amplitude to the pressurization process; whether the far-end artery blood flow enters a blocking critical state or not is judged in combination with a preset background noise base; if yes, the cuff is controlled to stop continuous pressurization, and the self-adaptive pressurization upper limit parameter measured this time is determined according to the cuff pressure at the corresponding moment; and controlling the sphygmomanometer to be switched from the pressurization control process to the deflation measurement process based on the self-adaptive pressurization upper limit parameter.

The invention relates to an automatic monitoring method and a monitoring system for coronary artery blood flow, which specifically comprises the following steps of: performing blood vessel segmentation on each frame of image, and extracting a mask, a center line and a diameter; feature points meeting the conditions that the normal distance from the center line is smaller than a threshold value and the local energy entropy meets a preset value are screened in the first-frame blood vessel area for tracking; tracking the points among frames by adopting a pyramid optical flow method, and constructing a non-isotropic weighting matrix solution equation when optical flow displacement is calculated to obtain an initial displacement vector field; an outlier vector in the initial displacement vector field is recognized and corrected, and a corrected velocity field is obtained through weighted average of neighborhood non-outlier vectors; establishing a coupling state space model for the feature points, and solving by taking the corrected velocity field as input to obtain a velocity field considering the blood flow conduction effect; and combining the normal component of the velocity field and the local diameter of the corresponding blood vessel to obtain the coronary artery blood flow.

Interventional procedures on the carotid arteries are performed through a transcervical access while retrograde blood flow is established from the internal carotid artery to a venous or external location. A system for use in accessing and treating a carotid artery includes an arterial access device, a shunt fluidly connected to the arterial access device, and a flow control assembly coupled to the shunt and adapted to regulate blood flow through the shunt between at least a first blood flow state and at least a second blood flow state. The flow control assembly includes one or more components that interact with the blood flow through the shunt.

The present invention provides a device capable of regulating the blood flow of the carotid artery, and relates to the technical field of medical devices. The device comprises a Y-shaped bracket, a net bag, an adjustment line, and a limiter. The Y-shaped bracket comprises a straight segment with a certain supporting force and capable of deformation, and two bifurcated segments. The net bag is arranged between the two bifurcated segments to form a space for accommodating arterial blood vessels. The first bifurcated segment and the straight segment are provided with a cavity for the adjustment line to pass through. The first end of the net bag is fixedly mounted on one end of the second bifurcated segment, and the other end of the net bag is connected to one end of the adjustment line, and extends from one end of the first bifurcated segment to one end of the straight segment, so that the net bag and the two bifurcated segments form a space for accommodating blood vessels. When people pull the adjustment line outward, the space formed between the net bag and the two bifurcated segments is reduced, thereby reducing the blood supply to the brain. The limiter is installed on the straight segment to fix the position of the adjustment line.

To provide an erection assisting device for the male genitalia, which induces an erection by causing a large amount of arterial blood to flow into the corpus cavernosum of the penis from a relaxed state, filling it with blood, and maintains the erect state by making it difficult for the blood in the penis to flow out of the penis. [Solution] The male erection assistance device 4 is comprised of a ring 1 to be attached to the base of the scrotum A, a ring 2 to be attached to the base of the penis B, and a joint 3 for holding the rings 1 and 2 at an angle rather than parallel to each other.

A system for monitoring blood distribution in a subject, the system comprising a processor (38) responsive to Doppler ultrasound data representing arterial blood flow in at least two different locations of the subject, such as the neck and arm, to obtain velocity (C, B1, B2, B3) or volume flow at each location, to monitor changes in a predetermined function of blood flow, and to provide an output indicative of monitored changes that may be due to blood volume centralization. This may indicate the onset of hypovolemia or hypervolemia.

Injecting botulinum toxin directly into the clitoris can treat various sexual dysfunctions and improve sexual satisfaction in many women. Without wishing to be bound by this hypothesis, these effects of botulinum toxin may act by, inter alia, increasing arterial blood flow within the clitoris via vasodilation, neovascularization within the clitoris, neurogenesis within the clitoris, changing autonomic tone, and activating the mid-hypothalamus.

The application discloses a model-driven arterial hemodynamics measurement method and device, equipment and a computer readable storage medium, and the method comprises the following steps: collecting arterial blood pressure waveform time series data in a preset cardiac cycle; inputting the arterial blood pressure waveform time series data into a preset aortic hemodynamics coupling model to obtain aortic hemodynamics waveform characteristic parameters; and determining cardiac output according to the aortic hemodynamics waveform characteristic parameters; wherein the preset aortic hemodynamics coupling model is formed by coupling a one-dimensional blood flow dynamics model simulating aortic blood vessel transmission characteristics and a zero-dimensional multi-elastic cavity model simulating peripheral arterial circulation impedance characteristics. The one-dimensional model in the coupling model can accurately depict the blood flow in the aorta and the pulse wave propagation and reflection phenomenon, and realize high-precision solution of blood pressure, flow velocity and flow waveform; the zero-dimensional model simulates the blood flow process of the peripheral artery and serves as a boundary condition of the one-dimensional model, so that the overall blood flow simulation is more in line with the real physiological state.

A method for medical examination, in particular determination of the blood pressure of an animal that preferably has a paw and is in particular an animal of the subfamily of the Felinae. In the method, a curve comprising information about the arterial blood flow of the animal, in particular a photoplethysmogram, is recorded, and the curve is cut into several curve sections in such a way that each curve section corresponds to a heartbeat. According to another independent aspect, a sensor or a subset of sensors is selected from several sensors of the same kind to perform the examination.

The application discloses a kind of based on flexible ultrasonic Doppler and AI blood vessel tracking blood flow noninvasive monitoring device, belong to intelligent medical monitoring field.The device includes: flexible ultrasonic Doppler sensor, for attaching body surface signal acquisition;Processing unit and the artificial intelligence analysis module in it, for automatic identification tracking blood vessel and calculate its cross-sectional area and blood flow velocity, and then obtain real-time blood flow;And optional pressure adaptive stabilization module, for dynamic adjustment of adhering pressure according to signal quality to maintain monitoring stability.The application realizes the continuous, noninvasive, automatic monitoring of arterial blood flow, with the advantages of high precision, strong anti-interference, convenient for clinical integration, suitable for perioperative period and critical patient hemodynamic management.

The invention discloses a diastolic pressure testing method and system based on artery occlusion dynamic tracking, and belongs to the technical field of blood pressure testing. The method comprises the following steps: an initial state detection stage: detecting the state of an artery blood vessel without external force through a photoelectric detector to obtain a PPG oscillogram; in the pressure applying stage, air bag pressure larger than systolic pressure is applied to the tail of the measured target, and arterial blood flow is blocked; in the pressure grading monitoring stage, the pressure of the air bag is gradually released, and the pressure value and a PPG signal are monitored in real time; in the systolic pressure judgment stage, when the pressure of the air bag is reduced to a systolic pressure critical value, artery blood flow is instantly burst open and blocked, a pulse wave signal appears in a PPG waveform for the first time, and an instantaneous pressure value is recorded to obtain systolic pressure; in the diastolic pressure judgment stage, the critical point when the pressure of the air bag is transited from periodic blocking to complete opening is recognized, and the instantaneous pressure value is recorded to obtain the diastolic pressure. According to the method, the diastolic pressure and the systolic pressure can be accurately identified through artery occlusion dynamic tracking and the characteristic difference of the PPG waveform when the blood vessel state changes.

The invention provides a device capable of adjusting carotid artery blood flow, and relates to the technical field of medical instruments, the device comprises a Y-shaped support, a net bag, an adjusting line and a limiting piece, the Y-shaped support comprises a linear section and two bifurcated sections, the linear section has a certain supporting force and can deform, and the net bag is arranged between the two bifurcated sections to form a space for containing artery blood vessels. The first bifurcated section and the linear section are provided with cavities allowing the adjusting line to penetrate through, the first end of the net bag is fixedly installed at one end of the second bifurcated section, and the other end of the net bag is connected with one end of the adjusting line and penetrates into one end of the linear section from one end of the first bifurcated section to extend to one end of the linear section, so that the net bag and the two bifurcated sections form a space for containing blood vessels. The adjusting line is drawn outwards by people, so that the space formed between the net bag and the two forked sections is reduced, and the blood supply amount of the brain is reduced. A limiting piece is installed on the straight line section and used for fixing the position of the adjusting line.

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.

This invention provides a chitosan hemostatic material for rapid arterial hemostasis, its preparation process, and its applications, relating to the field of medical technology. The chitosan hemostatic material prepared by this invention can significantly shorten hemostasis time, maintain stable adhesion to the wound surface even under the impact of arterial blood flow, and is not easily detached, exhibiting strong wet adhesion and erosion resistance. The chitosan hemostatic material prepared by this invention not only improves the mechanical strength of the material but also provides more bioactive sites, activating intrinsic coagulation pathways and platelet aggregation, thereby improving hemostasis efficiency and showing significant advantages in emergency applications for arterial bleeding. The chitosan hemostatic material prepared by this invention combines rapid coagulation and stable hemostasis, and has good biocompatibility, controllable degradation, reduced inflammatory response, and high safety. The porous structure of the chitosan hemostatic material prepared by this invention is beneficial for tissue repair, does not adhere to other tissues, promotes healing, and has promising application prospects.

The invention relates to the technical field of blood flow monitoring, in particular to a coronary artery blood flow monitor which comprises a mounting frame, a blood flow monitor body is movably arranged in the mounting frame, a wire arrangement frame is fixedly connected to the back face of the mounting frame, and a disinfection assembly is arranged on the back of the wire arrangement frame. A monitoring assembly is arranged in the disinfection assembly, a disinfection cover frame is fixedly connected to the back face of the wire arranging frame, and a liquid storage box and a dirty liquid box are fixedly connected to the upper end and the lower end of the disinfection cover frame correspondingly. According to the coronary artery blood flow monitoring device, the coronary artery blood flow monitoring device can be in butt joint with the chest and heart position of a patient in a more adaptive mode, monitoring operation is completed, and in the actual using process, a worker firstly installs the whole blood flow monitoring device body into the installation frame; at the moment, the interface in the blood volume monitor body can be adaptively attached and connected with the contact joint on the front surface of the flat cable rack from the connecting groove of the mounting frame.