23 results about "Arterial flow" patented technology

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.

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.

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 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.

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.

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.

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.

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.

The invention relates to a magnetic resonance imaging method based on pseudo-continuous arterial spin labeling, a medium and equipment. According to the magnetic resonance imaging method, on the basis of pseudo-continuous artery spin labeling, PCASL sequence parameters are optimized, then a multi-modal structure image is combined with a PCASL image, a heart artery blood perfusion weighted image is generated, and more accurate parameter estimation is obtained. Furthermore, a proper range is selected to optimize the acquisition sequence through parameter fitting, and the processing process of combining the acquired image and the PCASL image is optimized, so that motion artifacts and physiological noise can be effectively inhibited, the signal-to-noise ratio is improved, and accurate parameters can be acquired more quickly and efficiently. The cardiac artery blood perfusion weighted image generated by the method has various clinical applications such as coronary heart disease diagnosis, myocardial infarction evaluation, cardiac surgery evaluation, cardiac rehabilitation evaluation and the like.

An arterial catheter system may include a catheter assembly that may include a catheter adapter. An arterial catheter system may include an arterial catheter extending from the distal end of the catheter adapter. An arterial catheter system may include a needle assembly that may include a needle hub and an introduction needle. An arterial catheter system may include an arterial blood shielding device coupled to the catheter assembly. An arterial catheter system may include an arterial catheter, a catheter adapter, and a fluid path within the arterial blood shielding device. A first fluid resistance in the portion of the fluid path within the arterial blood shielding device may be greater than a second fluid resistance in the fluid path distal to that portion of the fluid path.

Provided is a coronary blood flow measurement device capable of acquiring significant information for determination of ischemic heart disease caused by stenosis or the like in a coronary blood vessel on the basis of measurement of a blood flow (coronary blood flow) in a blood vessel (coronary blood vessel) of a heart. This coronary blood flow measurement device (10) includes: a CFR acquisition means (12) for acquiring a calculated value of coronary blood flow reserve (CFR); and a cCFR calculation means (14) for obtaining a blood pressure correction CFR (cCFR) by converting the calculated value of the coronary blood flow reserve (CFR) acquired by the CFR acquisition means into a value under a condition of an arbitrary specific value (ΔPs) of an arteriovenous pressure difference (ΔP(a-v)) by using a linear relationship between a maximum hyperemia coronary blood flow (Q(hyp.)) and the arteriovenous pressure difference (ΔP(a-v)).

A smartwatch-integrable, low-power wearable antenna biosensor measuring RF bioimpedance (BioZ) changes from radial artery blood flow using radio frequencies (RF) for continuous blood pressure estimation is provided (100). This non-contact RF BioZ-based approach (300) offers a more equitable solution across diverse demographics than current solutions. The wearable device has shown performance equivalent to clinical pulse oximeter PPG sensor, with mean absolute errors (MAE) of 2.41 ± 3.2 mmHg for RF BioZ and 2.52 ± 2.54 mmHg for PPG for systolic blood pressure (SBP). It meets British Hypertension Society (BHS) and Association for the Advancement of Medical Instrumentation (AAMI) error threshold requirements for grade A / passing score for non-cuff-based BP measuring technology, respectively.

The utility model discloses a connector for supporting arteriovenous fistula blood vessels and a supporting device. The arteriovenous fistula blood vessel is obliquely matched with the artery from the vein, an anastomosis angle smaller than 90 degrees is formed between the vein and the artery, the connector comprises a frame body of a hollow structure, the frame body is arranged at the anastomosis position of the vein and the artery in a sleeving mode, and the frame body comprises a first frame capable of being arranged on the artery in a sleeving mode and a second frame capable of being arranged on the vein in a sleeving mode. The first frame is connected with the second frame, the frame body further comprises a supporting part with a reinforcing structure, and the supporting part is connected between the first frame and the second frame and arranged on the opposite side of the anastomosis angle. The supporting strength of arteriovenous fistula blood vessels is enhanced through the arrangement of the combination piece, the circumferential stress of the arteriovenous fistula blood vessels can be well resisted, the negative influence of artery blood flow is reduced, and then the problem that the arteriovenous fistula blood vessels are narrow or blocked due to the existence of circumferential stress concentration areas is reliably solved.

The invention discloses a method for constructing a renal ischemia reperfusion mouse model, and relates to the technical field of animal model construction, and the method is characterized by comprising the following steps: S1, anesthetizing a mouse; s2, fixing and disinfecting the mouse; s3, cutting the skin, separating layer by layer, and exposing kidney tissues and blood vessels; the kidney is rotated by 360 degrees with the renal artery as the axis, the rotation state is maintained for 30 minutes, and then the kidney is reset to open renal blood flow; and S5, suturing the surgical incision. According to the constructed mouse model, on the basis of effectively blocking artery blood flow, the complexity of surgical operation is reduced, the total renal artery is protected to the maximum extent, renal blood flow supply after recanalization is guaranteed, and the renal artery blood flow is blocked within a certain time without damaging blood vessels. And a good and stable animal model is provided for better researching the mechanism of acute kidney injury and innovative treatment schemes in the future.

The application discloses an ultrasonic examination method, device and equipment for arterial blood flow and a readable storage medium, relates to the technical field of image processing, and comprises the following steps: acquiring a blood flow scanning section image collected by an ultrasonic device; and identifying arterial blood flow regions in each section region in the blood flow scanning section image; wherein, the section type of each section region is any preset section type; and determining respective ultrasonic placement points corresponding to each section region according to the arterial blood flow regions, so as to perform ultrasonic examination at the ultrasonic placement points; wherein, the ultrasonic placement points are in the arterial blood flow regions. The application can simultaneously identify and capture all arterial blood flows in each tissue part in an image, automatically determine the ultrasonic examination positions of the arterial blood flows in each tissue part by determining respective ultrasonic placement points corresponding to each section region according to the arterial blood flow regions, and thus realize ultrasonic examination of the captured arterial blood flows, reduce the operation difficulty of ultrasonic examination of arterial blood flows, and improve the examination efficiency.

The vascular endoscope comprises a handle and a catheter, one end of the catheter is coaxially fixed in the handle, and an instrument channel used for being inserted into an endoscope or a fiberscope and a balloon tube channel used for being inserted into a balloon tube are formed in the catheter in the axial direction of the catheter. An instrument channel joint communicated with the instrument channel and a balloon tube channel joint communicated with the balloon tube channel are arranged on the handle; a blood channel is formed in the balloon tube in the axial direction of the balloon tube, and a blood via hole communicated with the blood channel is formed in the surface of the catheter. According to the vascular endoscope, arterial blood flow can be prevented from passing through an operation site through insertion of the balloon tube and balloon water injection, meanwhile, the arterial blood can enter the downstream artery of the operation through the blood channel and the blood via hole, normal flowing of the blood is not blocked in the operation process, the morbidity of important visceral organs is reduced, and the operation efficiency is improved. The postoperative survival rate and the survival quality of the patient are improved, the surgical risk is reduced, and the operable time of the surgery is prolonged.