283 results about "Venous vessel" patented technology

A venous valve device provides antegrade blood flow in venous vessels of the body having dysfunctional valves; it is formed in situ from autologous vein conduit not having a valve present locally. An overlap region is formed by attaching two opposing walls of the vein together in a generally axial direction forming two tubular regions. One region provides antegrade blood flow and the other region provides a sinus cavity that is filled during the initiation of retrograde blood flow. A valve cusp is formed by attaching vessel wall together forming a commissure that extends between the two overlap regions. A single valve cusp moves toward the sinus cavity to allow antegrade blood flow and moves away from the sinus cavity to block retrograde blood flow. The venous valve can also be formed from biological tissue from an autologous, heterologous, or other tissue source and implanted interpositionally at the site of valvular incompetancy.

Systems and methods for treating thrombosis and or emboli in a peripheral vasculature of a patient are disclosed herein. The method can include providing a thrombus extraction device including a proximal self-expanding coring portion formed of a unitary fenestrated structure and a distal expandable tubular portion formed of a braided filament mesh structure; advancing a catheter constraining the thrombus extraction device through a vascular thrombus in a vessel; deploying the thrombus extraction device from the catheter from a constrained configuration to an expanded configuration; retracting the thrombus extraction device proximally so that the coring portion cores and separates a portion of the vascular thrombus from the venous vessel wall while the mesh structure captures the vascular thrombus portion; and withdrawing the thrombus extraction device from the patient to remove the vascular thrombus portion from the vessel.

In one embodiment, the invention provides a device for decreasing intracranial or intraocular pressures. The device comprises a housing having an inlet opening and an outlet opening that is adapted to be interfaced with a person's airway. The device further includes a valve system that is operable to regulate respiratory gas flows through the housing and into the person's lungs during spontaneous or artificial inspiration. The valve system assists in lowering intrathoracic pressures during each inspiration to repetitively lower pressures in the venous blood vessels that transport blood out of the head to thereby reduce intracranial or intraocular pressures.

A convertible multi-lumen catheter that may be used for hemodialysis or other indications involving infusion and/or withdrawal of fluids from the body. Unlike existing catheters having a set number of lumens which may limit their utility as both short and long-term venous vascular devices, the catheter of the invention allows one or more additional lumens during the acute phase of catheter use with removal of these lumens (i.e. conversion) for more permanent use. A typical example of this would be a triple lumen device for hemodialysis and antibiotic therapy during an acute infection with conversion to a chronic dual lumen hemodialysis catheter after successful treatment of the infection. The lumen is permanently or semi-permanently blocked using a biocompatible plastic obturator that is inserted into the unused lumen and locked and/or glued into place.

A venous valve device and method of formation are described to provide antegrade blood flow in the deep venous vessels of the leg or in other venous vessels of the body having incompetent or irreversibly dysfunctional valves. The venous valve device is made of a sheet of biocompatible material, comprising a longitudinal wire-frame structure that is a continuous seamless wire loop and plural anchoring mesh-lattice wing members spaced apart and connected to the base of the wire-frame structure.

A device and method for monitoring an access to a patient, an extracorporeal blood circuit and/or a dialysing fluid system includes a centrifugal pump for conveying blood or dialysing fluid instead of an occluding pump. Centrifugal pumps bring about a large change in flow rate by even a small change in pressure difference across the pump. The device includes a measuring unit for measuring the flow rate of blood or dialysing fluid conveyed by the centrifugal pump, and a control and computing unit configured to determine an incorrect vascular access or malfunction if a change in measured flow rate Q is more than a predetermined amount. For example, a small drop in pressure in the venous blood line leads to a marked increase in the flow rate of the centrifugal pump, which is used as a basis for the detection of an incorrect vascular access.

The invention provides a fundus retinal vessel recognition and quantification method, device and equipment and a storage medium, and the method comprises the steps: inputting an original fundus imageinto a pre-trained U-shaped convolutional neural network model for processing, and obtaining a target feature map; performing optic disk segmentation based on the target feature map; segmenting the original fundus image to obtain an arteriovenous blood vessel recognition result; carrying out region-of-interest positioning based on the optic disk segmentation result; extracting a blood vessel center line according to the arteriovenous blood vessel recognition result, detecting key points in the blood vessel center line, removing the key points to obtain a plurality of mutually independent bloodvessel sections, and correcting arteriovenous category information on each blood vessel section; and based on the extracted blood vessel center line, obtaining the blood vessel diameter of each bloodvessel section after category information correction, and then quantifying arteriovenous blood vessels in the region of interest. According to the embodiment of the invention, the fundus retina artery and vein vessel identification precision is improved, and the quantization precision is further improved.

An infusor system for administering medications to a venous blood vessel in the body of a patient. The infusor system includes a flexible, elongated delivery tube having opposite ends. One of the ends is couplable to a supply of liquid medication, which is remote from the venous blood vessel. The system further includes a delivery component coupled to the other end of the delivery tube. This delivery component is adaptable to be placed in confronting relationship with the venous blood vessel so that medication from said supply may be introduced directly into the venous blood vessel and distributed in the body of the patient. The infusor system further includes a pressure-altering device used for increasing intraabdominal pressure in the body of the patient. Sampling of venous blood from the meningorrhachidian vasculature is also possible.

A method for identifying a arteries and veins in a medical image is provided. A start point and endpoints of branches of a segmented tubular tree are identified. Distance maps for each of the endpoints relative to the startpoint are created. Then voxels in between the furthest of the endpoints and the startpoint are identified. This last step is iterated for the subsequent furthest of the endpoints. For each set of identified voxels parameters are identified. Examples of such parameters are cross sectional areas of the branches. The parameters for at least one each set of identified voxels are then used to anatomically label branches the segmented tubular tree, optionally with position information obtained from the image.

The invention discloses an arteriovenous simulation method and device used for puncture teaching. According to the device, two latex tubes, namely a first latex tube and a second latex tube, are arranged on an emulational arm to respectively simulate an arterial blood vessel and a venous blood vessel, a diaphragm pump is used to extract emulational blood from a liquid storage container, and pumps the emulational blood to the first latex tube; after flowing through the first latex tube, the emulational blood enters the second latex tube through a throttle valve, and finally the emulational blood returns back to the liquid storage container through the second latex tube, so that a simulated blood circulation system is formed; a brushless DC motor is controlled to be started/stopped intermittently to drive the diaphragm pump, so that the first latex tube can shrink and expand intermittently to simulate human pulse beat; after the emulational blood flows through the throttle valve, expansion and shrinkage frequency reduces, even expansion and shrinkage disappear, so that the second latex tube can simulate a human venous blood vessel; when puncture teaching is needed, the two latex tubes on the emulational arm are respectively punctured by an injection syringe needle, so that arterial puncture and venipuncture simulation trainings are realized.

Systems and methods for selective auto-retroperfusion along with regional mild hypothermia. In at least one embodiment of a system for providing a retroperfusion therapy to a venous vessel of the present disclosure, the system comprises a catheter for controlling blood perfusion pressure, the catheter comprising a body having a proximal open end, a distal end, a lumen extending between the proximal open end and the distal end, and a plurality of orifices disposed thereon, each of the orifices in fluid communication with the lumen, and at least one expandable balloon, each of the at least one expandable balloons coupled with the body, having an interior that is in fluid communication with the lumen, and adapted to move between an expanded configuration and a deflated configuration, and a flow unit for regulating the flow and pressure of a bodily fluid, and a regional hypothermia system operably coupled to the catheter, the regional hypothermia system operable to reduce and/or regulate a temperature of the bodily fluid flowing therethrough.

The invention discloses a laser imaging method and a device for automatically cutting artery blood vessel and vein blood vessel. The invention adopts single wavelength laser to illuminate; based on the difference of dynamic characteristics and spectral absorption characteristics of laser speckle of an artery zone and a vein zone in biological tissues, artery blood vessels and vein blood vessels are automatically cut by operations, such as time sequence image pixel gray degree minimum analysis, background non-uniformity correction and the like. The invention is suitable for physiology, pathology, pharmacology, drug effect evaluation research as well as clinical medical diagnosis and treatment.

The invention relates to systems and methods for intracranial venous vessel access and a system for treatment of dural sinus thrombosis. In particular, a system including a co-axial combination of a steerable variable thickness microwire operatively supporting a tapered larger bore support and larger bore distal access catheter is described. Methods of advancing the intracranial access system through the venous vasculature are also described.

The invention is directed to a method and a device for separate three-dimensional presentation of arteries and/or veins of a vessel system in a part of the body of a vertebrate by a rotation computer tomography. A masking run of the tomograph is undertaken without contrast media around the part of the body. Then two filling runs with contrast media are executed, with the venous phase of vessel contrasting during the first filling run occurring during the arterial phase of vessel contrasting of the second filling run and vice-versa. The data from the first and second filling run is combined into data sets from the arterial or the venous phases of the vessel contrasting of the filling runs. The data of the masking run is subtracted from the combined data sets to obtain final data sets for a three-dimensional presentation of the arterial or the venous vessel system.

The invention belongs to the technical field of optical technologies and medical optical images, particularly relates to a scanning synchronous imaging and indicating device and method for venous vessels and aims to receive a scanning imaging signal by using a linear array photoelectric sensing element, simulate or digitalize a photoelectric signal and form indicating vessels by using a visible light LED array in a discrete light spot form, and image processing with a large data volume and image calibration are eliminated. The technical scheme adopted by the invention is that the scanning synchronous imaging and indicating device comprises a near-infrared LED light source for illuminating the vessels and an imaging lens, wherein a scanning galvanometer is arranged between the imaging lens and an imaging plane thereof; the linear array photoelectric sensing element capable of sensing near-infrared light is arranged on the image plane reflected by the scanning galvanometer; a near-infrared interference filter is arranged between the imaging plane where the linear array photoelectric sensing element is positioned and an optical axis of reflecting light of the scanning galvanometer; the near-infrared interference filter is parallel to a mirror surface of the scanning galvanometer during immobility; the visible light LED array is connected to a driving end of a signal processing and driving circuit; a projection lens is arranged between the visible light LED array and the near-infrared interference filter.

The invention relates to the technical field of medical appliances, in particular to a support type artificial venous blood vessel with valve for treating venous reflux diseases and venous return obstruction diseases. The artificial venous blood vessel comprises artificial valve (1) inside the artificial blood vessel, a metal support (2) attached to the outer wall of the artificial blood vessel to support the artificial blood vessel, a metal ring (3) attached to the metal support to support the valve and an artificial blood vessel (4) beyond the range of the support. The artificial venous blood vessel is produced according to the normal vessel valve structure of the human body, the vessel valve can be opened and closed freely, the supporting strength of the support is proper, and the supporting metal ring can maintain the normal state of the vessel valve. The artificial venous blood vessel has the advantages of reasonable structure, low fabrication cost and good histocompatibility, and can be used for valve repair operation for lower limb deep vein, valve repair operation for upper limb deep vein and main vein return obstruction disease of four limbs (especially occlusive diseases) After the vein of the pathologic section is resected, the support type artificial venous blood vessel with the valve is stitched on the normal vein, the operation is simple, and the operative wound is small.

The invention provides an automatic arm binding strap control device for venous blood sampling. The automatic arm binding strap control device for venous blood sampling comprises an operating box installed on a movable supporting leg frame. A movable seat for seating a blood sampling operator and a movable seat for seating a person with blood to be sampled are arranged at the rear end and the front end of a box bottom plate of the operating box respectively. The person with blood to be sampled is seated on the corresponding movable seat and places one arm in an elastic binding strap of a tensioning controller from one side of the semicircular box wall of the operating box, wherein the elastic binding strap stretches out from a binding strap slit in the upper side of an operating platform; a computer controller is arranged at the rear end of the operating box and controls a transmission controller to drive the tensioning controller through a data line, and the elastic binding strap where the arm of the person with blood to be sampled is placed is automatically tensioned to a suitable tightness degree, so that venous blood is prevented from flowing back, the vein of the arm of the person with blood to be sampled is exposed, and then blood sampling is completed. The automatic arm binding strap control device has the advantages that the arm binding strap control device with the automatic detection and tightness degree control functions is developed, batched blood sampling is conveniently, rapidly and safely completed, and problems existing in blood sampling are solved.