51 results about "Arterial flow" patented technology

Systems and methods are provided for reducing the reliance on operator skill during vascular ultrasound procedures. The placement of an ultrasound probe to assess perfusion associated with a wound may be facilitated by receiving input suitable for identifying an anatomical region associated with the wound and providing an indication of a suitable initial probe position, and optionally, probe orientation, for acoustically interrogating a target arterial vessel known to provide perfusion to the anatomical region associated with the wound. Regions exhibiting arterial flow may be detected as the probe is moved, enabling arterial vessel detection and localization. A subregion within the detected arterial vessel and a beam steering angle may be autonomously determined for spectral Doppler data collection, enabling the measurement of hemodynamic measures associated with the arterial vessel. Example apparatus for securing the probe to the patient and facilitating probe positioning to search for a target vessel are disclosed.

The utility model discloses a splenic artery blood flow limiting support, and particularly relates to the technical field of medical instruments, the splenic artery blood flow limiting support comprises a supporting support and a flow limiting support, the supporting support is sleeved outside the flow limiting support, two ends of the flow limiting support are fixedly connected with the inner side wall of the supporting support, the flow limiting support is a covered stent, and the flow limiting support comprises a contraction section and an expansion section. The contraction section and the expansion section are fixedly connected and communicated, and splenic artery blood flow in the supporting stent flows in from the contraction section and flows out from the expansion section. The splenic artery embolism postoperative spleen blood perfusion can be reduced, and the recurrence of splenic hyperfunction is reduced.

The application provides a method for measuring an ultrasound coronary artery flow reserve fraction, and relates to the technical field of ultrasound imaging.The method for measuring the ultrasound coronary artery flow reserve fraction provided by the application estimates the blood pressure distribution of a coronary artery stenosis region through a fluid mechanics model based on ultrasound contrast video, and then obtains a flow reserve fraction FFRUS and a reliability index sigma.Based on the ultrasound contrast video data V0 collected, the coronary artery ultrasound contrast imaging video data V1 is determined by using a sliding window double filtering strategy;based on V1, the stenosis region of the coronary artery is determined as a target region Omega;based on V1, the blood flow velocity field V2 of the target region Omega is determined;based on V2 and the proximal blood pressure value Pa of the target region Omega, the blood pressure distribution V3 of the target region Omega is determined;based on V3, the flow reserve fraction FFRUS and the reliability index sigma are calculated by using the flow reserve fraction definition.

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.

Venous and arterial flow systems for patient simulators, invasive blood pressure systems for patient simulators, tension pneumothorax inserts for patient simulators, and ultrasound-guided procedure inserts for patient simulators, as well as associated devices, systems, and methods, are provided.

The invention provides an arterial flow limiter. The arterial flow limiter comprises a fixing support used for anchoring the flow limiter to an artery; the flow adjusting support is used for adjusting blood flow; the connecting part is used for connecting the fixed bracket and the flow adjusting bracket; the fixing support allows blood to pass through holes of the fixing support, and the mesh density of the fixing support is smaller than that of the flow adjusting support, so that after the blood flows through the fixing support, most of the blood flows through a gap between the flow adjusting support and an artery wall; the expansion degree of the flow adjusting support can be adjusted, the outer surface of the flow adjusting support is of a streamline structure, the curvature radius Rc of the outer contour is matched with the diameter D of the artery, and Rc / D = 0.25 is met, so that the wall surface shearing force of blood flow to the artery is stabilized within a certain range, and turbulent flow is prevented from being formed.

Systems and methods are provided for reducing the reliance on operator skill during vascular ultrasound procedures. The placement of an ultrasound probe to assess perfusion associated with a wound may be facilitated by receiving input suitable for identifying an anatomical region associated with the wound and providing an indication of a suitable initial probe position, and optionally, probe orientation, for acoustically interrogating a target arterial vessel known to provide perfusion to the anatomical region associated with the wound. Regions exhibiting arterial flow may be detected as the probe is moved, enabling arterial vessel detection and localization. A subregion within the detected arterial vessel and a beam steering angle may be autonomously determined for spectral Doppler data collection, enabling the measurement of hemodynamic measures associated with the arterial vessel. Example apparatus for securing the probe to the patient and facilitating probe positioning to search for a target vessel are disclosed.

A radial artery blood flow monitoring device relates to the technical field of cardiovascular medicine. The radial artery blood flow monitoring device is based on a radial artery air bag compressor, an air bag is installed on the lower surface of the radial artery air bag compressor, the radial artery blood flow monitoring device comprises an air pump, a blood flow monitoring probe and a signal processor, the air pump is communicated with the air bag through an air supply pipe, and the blood flow monitoring probe is of an inverted-Y-shaped structure; the blood flow monitoring probes are embedded in the two sides of the radial artery air bag compressor, a first B-ultrasonic probe is arranged on one side of the lower end of each blood flow monitoring probe, a second B-ultrasonic probe is arranged on the other side of the lower end of each blood flow monitoring probe, one B-ultrasonic probe is used for monitoring the blood flow condition of the proximal end, and the other B-ultrasonic probe is used for monitoring the blood flow condition of the telecentric end. The upper end of the blood flow monitoring probe is connected with the signal processor through a wire. According to the scheme, the problems that in the operation process of an existing pneumatic compression device, the hemostasis pressure needs to be frequently evaluated and adjusted, the workload of nursing staff is large, and use and popularization are inconvenient are solved.

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 present invention relates to the field of ultrasounds and imagining of the coronary blood flow of the heart. Patients with coronary microvascular dysfunction (CMD) have poor prognostic with significantly higher rates of cardiovascular events, including hospitalization for heart failure, sudden cardiac death, and myocardial infarction (MI). Despite the urgent clinical need, there are no non-ionizing and non-invasive techniques available in clinic to directly visualize the coronary microvasculature and assess the local coronary microvascular system. Flow imaging remains a difficult task to perform in the heart because of the fast movements of this organ. In order to overcome the limitations of actual imaging methods for the coronary blood flow, the inventors proposed an ultrasound ultrafast imaging method that automatically detect the time periods in which the myocardium velocity is low and estimate the coronary flow velocity and the tissue velocity from the same data acquisition.

The invention provides a myocardial coronary artery blood perfusion space-time dynamic evolution imaging system, and relates to the technical field of biomedical imaging, the method comprises the following steps: a connection layer receives a frame data stream containing an original speckle image sent by a user interface layer, and sends the frame data stream to a data processing layer; after the data processing layer receives the frame data stream, the frame data stream is subjected to parallel processing in a video recording unit and a frame analysis unit, and a blood flow index corresponding to each pixel in the original speckle image is obtained; and the connection layer generates a blood flow index distribution diagram based on the received blood flow index corresponding to each pixel in the original speckle image sent by the data processing layer in the first buffer area of the blood flow index diagram conversion unit, and sends the blood flow index distribution diagram to the user interface layer for display. According to the imaging system provided by the invention, the spatial-temporal dynamic evolution process of myocardial coronary blood flow can be observed in real time, the spatial-temporal resolution is very high, and an important index is provided for quality evaluation in coronary artery bypass grafting.

The invention relates to a real-time recognition device for spontaneous circulation recovery during cardio-pulmonary resuscitation. The real-time identification equipment comprises a signal sensing device which comprises an ultrasonic probe and is used for sensing a carotid artery blood flow signal in real time by adopting the ultrasonic probe; and the real-time analysis device is used for analyzing the carotid artery blood flow signal by utilizing a pre-trained machine learning model so as to identify the spontaneous circulation recovery during the cardio-pulmonary resuscitation period in real time. According to the embodiment of the invention, real-time, accurate and non-invasive ROSC identification can be realized.

The present invention relates to determining a flow profile in an artery from ultrasound imaging data. To this end, a computer-implemented method is provided for determining a flow profile based on arterial measurements, intra-arterial velocities, and asymmetry measures, the arterial measurements, intra-arterial velocities, and asymmetry measures determined from ultrasound imaging data, including B-mode, pulsed wave Doppler, and color or power Doppler ultrasound imaging data.

The invention discloses a bifurcated aneurysm stent which is of a self-expanding structure, at least one window is formed in the wall of the stent, and the window can be automatically opened after the stent is released from a micro catheter by means of the hyperelasticity of nickel-titanium alloy, so that the neck of the bifurcated aneurysm is covered. By means of the design, the embolism effect is guaranteed, meanwhile, the influence of the stent on lateral artery blood flow is remarkably weakened, and the risk that a traditional stent shields branch arteries is avoided. The intravascular metal content and the thrombus occurrence rate are effectively reduced, the wide-neck aneurysm treatment problem is solved, and the beneficial effects of being easy and convenient to operate, high in safety and capable of accelerating healing are achieved.

The present invention discloses a method, system, device, and medium for determining the fractional flow reserve (FFR) of a coronary artery. This method uses a fully connected network model to build a network model for determining the FFR distal to a stenosis. The model extracts the geometric features of the blood vessels from acquired IVUS or IVOCT image sequences and calculates the pressure loss across the stenosis. The geometric feature parameter set of the target vessel segment and the calculated pressure loss across the stenosis are input into the trained network model, which then outputs the FFR distal to the stenosis of the target vessel segment. The method utilizes deep learning technology, combining data-driven analysis with physical knowledge to integrate coronary artery physiology and morphology, thereby improving the accuracy of physiological assessments of coronary artery lesions.

The invention discloses a conduit pump clamping device and an in-vitro simulation circulating system, the conduit pump clamping device comprises an inlet flange and an outlet flange, and fluid flows from the inlet flange to the outlet flange. A penetrating pipe is arranged in the outlet flange, one end of the penetrating pipe communicates with the first cavity, and the other end of the penetrating pipe penetrates through the side wall of the outlet flange and extends out of the outlet flange. The far end of the catheter pump can penetrate into the catheter pump clamping device through the penetrating pipe until the fluid inlet in the catheter pump is located in the first cavity, and the fluid outlet in the catheter pump is located in the penetrating pipe. At the moment, the fluid entering the outlet flange can flow out in two ways: the fluid is pumped out through the conduit pump or flows out from a fluid outlet on the outlet flange. In this way, the pumping flow of the conduit pump in the auxiliary process can be obtained by measuring the fluid flow of the penetrating pipe; and the fluid can be converged after flowing out, and the total flow of the artery can be obtained by measuring the converged flow, so that a tester can evaluate the real performance of the catheter pump.

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 present disclosure describes a system that can enable the prediction of coronary flow without invasive medical procedure. The system can generate physical models that can provide an accurate assessment of coronary mechanics and enable realistic simulation of coronary procedures. The models can enable the hemodynamic measurement of flow through the model and the study of flow dynamics through the model and the biomechanics of the model.

Methods and systems are provided for diagnosis and / or treatment of microvascular dysfunction, such as microvascular obstruction (MVO) by injecting volumetric flows into a vessel using an infusion system to arrest or reverse native antegrade flow, such that an equipoise value of volumetric flow rate and corresponding pressure may be determined, which in turn enables calculation of MVO, absolute hydrodynamic resistance, fractional flow reserve, coronary flow reserve, and other physiologic parameters in real-time or near real time.

A method of inducing blood-brain barrier (BBB) opening for delivery of a non-BBB permeable substance to a subject includes the steps of: administering an ethyl alcohol at 0.01%-5% v / v into an arterial bloodstream via arterial injection guided by ultrasound and inducing a homogeneous distribution of the non-BBB permeable substance in a brain parenchyma. The ethyl alcohol reaches a brain of the subject to induce a transient opening of blood-brain barrier so that the non-BBB permeable substance can penetrate the blood-brain barrier to reach the brain and its concentration can be adjusted precisely by serial dilution. The non-BBB substance includes a therapeutic agent, a diagnostic agent, or a prophylactic agent. The use of low concentration of ethyl alcohol can induce a temporary BBB opening for about 120 minutes and then the BBB can be restored to normal without causing significant harmful effect.

The invention belongs to the field of disease assessment systems, and particularly relates to a pulmonary artery embolism assessment system. The systematized pulmonary artery embolism evaluation system is constructed by combining the pulmonary artery systolic pressure estimated by tricuspid valve regurgitation and the difference value (Y) of the pulmonary artery systolic pressure estimated by pulmonary artery valve regurgitation pressure, the pulmonary artery blood flow acceleration time, the finger pulse oxygen saturation and other parameters. Compared with a traditional single ultrasonic index (for example, only depending on the increase of pulmonary arterial pressure), the method has the advantages that pulmonary embolism and other diseases (such as left heart related pulmonary hypertension and chronic obstructive pulmonary disease) possibly causing the increase of pulmonary arterial pressure can be effectively distinguished through multi-parameter comprehensive evaluation, so that the accuracy and specificity of pulmonary embolism diagnosis are remarkably improved.

The present invention specifically relates to the technical field of medical devices. Disclosed are a splenic artery blood flow restriction stent and a use method. The splenic artery blood flow restriction stent comprises a support stent (1) and a flow restriction stent (2); the support stent (1) is sleeved outside the flow restriction stent (2); two ends of the flow restriction stent (2) are fixedly connected to the inner side wall of the support stent (1); the flow restriction stent (2) is a covered stent; the flow restriction stent (2) comprises a contraction section (3) and an expansion section (4); the contraction section (3) is fixedly connected to and communicated with the expansion section (4); and splenic artery blood flow in the support stent (1) flows in from the contraction section (3) and flows out from the expansion section (4).

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 disclosed concepts are directed to providing protocols, ideas, concepts, designs, methods and systems related to determining vascular compliance of a subject. In particular, blood pressure and arterial flow of first and second arteries (corresponding arteries on the same or contralateral limb) are measured (e.g., as a function of arterial diameter and / or velocity at which blood travels through the arteries). The pulse pressure can be determined from the blood pressure and the pulse quantity can be determined from the arterial flow. Vascular compliance can be determined from the pulse pressure and the volumetric pressure. Therefore, a direct and accurate vascular compliance estimation result can be obtained in a non-invasive manner. Also disclosed is using the determined vascular compliance in a transfer function to obtain accurate hemodynamic parameter estimates (e.g., cardiac output and stroke output) of a subject.

The present invention relates to a medical device that allows a small portion of the epidermis to be simultaneously affected by micro-suspension and inflow of a large amount of arterial blood through an alternately pressurized tubing system. The arterial blood cannot pass through the capillaries [(7) in Figure 6] again due to the action of the pressurized conduit, as they bear greater pressure than without the device, forced through the capillaries [(8) in Figure 6], as if they are suspended in the air, as they no longer come into contact with the support surface. The device works periodically, which means that no matter where the lesion is located, the amount of arterial blood flowing through the lesion is larger than that of arterial blood flowing through the lesion in the prior art.

The utility model discloses a cannula for supporting arteriovenous fistula blood vessels and a supporting device, the cannula is used for sleeving a vein anastomosis connection section, and the cannula is provided with a first end close to an artery anastomosis connection section and a second end far away from the artery anastomosis connection section; in the extending direction from the first end to the second end, the sleeve is bent towards one side, and the length of the sleeve is 10-15 mm. According to the cannula for supporting the arteriovenous fistula blood vessel, by designing the bending form of the cannula, the space angle of the vein anastomosis connecting section is optimized, so that the space angle of the vein anastomosis connecting section is limited within the range of 10-20 degrees; therefore, oscillation shear stress of blood on arteriovenous fistula blood vessels can be well reduced, negative effects of artery blood flow are avoided, and then the problem that the arteriovenous fistula blood vessels are narrow or blocked due to the fact that oscillation shear stress concentration areas exist in the arteriovenous fistula blood vessels is reliably solved.

To enable medical examination of an animal such as a dog or a cat which is highly reliable, accurate, fast and / or non-invasive, especially without using a cuff.SOLUTION: The present invention relates to an examination apparatus for medical examination, in particular blood pressure measurement, of animals, in particular of animals with legs, particularly preferably of Felinae animals. The examination apparatus has a sensor device for optical examination of the arterial blood flow of an animal, in particular for carrying out photoplethysmography. For this purpose, the sensor device has at least one emitter for the emission of electromagnetic radiation and at least one detector for the detection of the radiation emitted by the emitter. Preferably, the sensor device comprises a plurality of emitters and a plurality of detectors, wherein the emitters and detectors are arranged in a periodic structure. Alternatively or additionally, the sensor devices have limiting devices which delimit the detection region of the sensor devices, such that the boundaries are at distances from the sensor devices which are greater than 0.5 mm and / or less than 5 mm.SELECTED DRAWING: Figure 1

The invention belongs to the field of intracranial pressure monitoring, and discloses a head-mounted intracranial pressure monitoring system and method.The head-mounted intracranial pressure monitoring system is characterized in that an ultrasonic monitoring unit and a PPG monitoring unit are integrated on a hair band and directly worn on the head; the detection end of the ultrasonic monitoring unit is stably arranged in a temporal target area, and the detection end of the PPG monitoring unit is stably arranged in a carotid pulse area, so that synchronous and continuous acquisition of cerebral hemodynamic information and arterial blood volume change information related to intracranial pressure is realized under the condition of not invading human tissues; infection risks and potential safety hazards caused by an invasive monitoring mode are avoided, and the safety of the monitoring process is remarkably improved. The ultrasonic monitoring unit and the PPG monitoring unit are integrally fixed in a hair band mode, so that the detection end keeps a relatively stable position relation in the long-time wearing process, and measurement errors caused by probe displacement and repeated positioning inconsistency are effectively reduced.

The utility model relates to the technical field of medical instruments, in particular to a balloon dilatation catheter which is characterized in that a guide wire cavity is fixedly installed in the middle of the interior of the catheter, a balloon is fixedly installed on the outer wall of the left side of the catheter, a plurality of blood circulation grooves are fixedly installed on the surface of the balloon, a plurality of through grooves are fixedly installed in the balloon, and the through grooves are communicated with the guide wire cavity. The two blood passing cavities are fixedly installed in the outer wall of the catheter, and the interference passing cavity is fixedly installed in the outer wall of the catheter. Due to the fact that the two blood circulation cavities for blood circulation are formed in the catheter body and the blood circulation grooves and the penetrating grooves which are distributed in the cross shape are formed in the balloon, blood circulation can be kept, and therefore blood flow cannot be blocked after the balloon is expanded; the problem that balloon dilatation cannot be kept for a long time due to the fact that aorta blood flow is blocked after balloon dilatation is solved, the balloon dilatation time is prolonged, the treatment effect is improved, and meanwhile the adverse effect on a patient caused by blood flow blocking is avoided.

Various exemplary embodiments of the present disclosure encompass a cardiopulmonary resuscitation (“CPR”) feedback method involving a carotid blood velocity measurement by an ultrasound sensor (20) of a patient during CPR of the patient and further involving a blood oxygenation measurement by an oxygenation saturation sensor (30) during CPR of the patient and / or a CO2 production measurement by a respiratory sensor (40) during CPR of the patient. An exemplary CPR feedback controller (60) generates CPR feedback based on a descriptive correlation and / or a prescriptive correlation of the carotid blood velocity measurement by the ultrasound sensor (20) and one or both of the blood oxygenation measurement by the oxygenation saturation sensor (30) and the CO2 production measurement by the respiratory sensor (40).