110 results about "Blood outflow" patented technology

A prosthetic venous valve includes a frame and leaflets. The frame includes: (i) a generally hollow base disposed at a blood inflow end; (ii) a plurality of struts connected with the base and extending generally parallel to a direction of forward flow of blood from the generally hollow base to a blood outflow end; and (iii) inwardly oriented flanges disposed at the blood outflow ends of the struts. The leaflets are disposed in gaps between the struts and are supported by the frame. The leaflets are arranged to close into the vein lumen to substantially seal against backflow of blood from the blood outflow end to the blood inflow end. The inwardly oriented flanges of the struts enhance the sealing.

Implantable valve for treating venous insufficiency having a self-expanding frame encased in polymer having a distal section for blood in-flow, a bulbous center section and a proximal section for blood out-flow. Polymeric leaflets have proximal ends forming a valve outlet which opens and closes in response to venous blood flow and distal portions integral with the inner polymer surface of the distal end of said bulbous section. The leaflets define a predominantly biomimetic sinus region with the bulbous section. Opening of the valve induces flushing of blood from the sinus region for smooth non-traumatic blood flow through said valve.

Apparatus and methods for the extracorporeal treatment of blood are described. The apparatus includes a dialyzer which is separated into a first and second chamber by a semipermeable membrane, wherein the first chamber is disposed in a dialysis fluid path and the second chamber can be connected to the blood circulation of a patient by way of a blood inflow conduit and a blood outflow conduit, a feed for fresh dialysis fluid, a discharge for spent dialysis fluid, a measuring device disposed within the discharge for determining the absorption of the spent dialysis fluid flowing through the discharge, wherein the measuring device has at least one radiation source for substantially monochromatic electromagnetic radiation, and a detector system for detecting the intensity of the electromagnetic radiation, wherein means are provided to compensate for changes that occur in the intensity of the electromagnetic radiation of the radiation source and/or the sensitivity of the detector system.

This invention describes apical access methods and devices that enable repair, modification, removal, and/or replacement of a defective heart valve while allowing the beating heart to deliver blood flow through the defective valve annulus for an extended period of time in volumes sufficient to sustain life. The invention is comprised of a flow housing having a blood inflow opening, a blood outflow opening, and a one-way valve disposed within the flow housing between the inflow and outflow openings.

A system for reducing the damaging effects of radiant energy, blast, or concussive events includes applying pressure to at least one jugular vein to reduce the egress of blood from the cranial cavity during or before the incidence of the imparting event. Reducing blood outflow from the cranial cavity increases intracranial volume and/or pressure of the cerebrospinal fluid to reduce the risk of traumatic brain injury and injuries to the spinal column. Reducing blood outflow further increases the intracranial pressure and volume, and thereby increases the pressure and volume of the cochlear fluid, the vitreous humor and the cerebrospinal fluid to thereby reduce the risk of injury to the inner ear, internal structure of the eye and of the spinal column. In addition, increasing intracranial pressure and volume reduces the likelihood of brain injury and any associated loss of olfactory function

A method is provided for detecting filter clogging which are able to keep track of the filter clogging with precision and in detail. At least one pressure selected from the group consisting of a pressure Pa in a blood inflow portion (32a), a pressure Pv in a blood outflow portion (32b), a pressure Pf1 in a filtrate inflow portion (32c), and a pressure Pf2 in a filtrate outflow portion (32d) is measured continuously, then a variation (pressure waveform) of the pressure is analyzed, a clogging of a filter (32) is detected using the analyzed result. Thereby a clogging of a filter is detected early. As a result, it is possible to prevent from developing of the filter clogging by controlling a dosage amount of anti-coagulant properly and changing a flow rate of blood. The variation of the pressure wave may be analyzed by subjecting the variable to Fast Fourier Transform.

A method and device for reducing the damaging effects of radiant energy, blast, or concussive events includes applying pressure to at least one jugular vein to reduce the egress of blood from the cranial cavity during or before the incidence of the imparting event. Reducing blood outflow from the cranial cavity increases intracranial volume and/or pressure of the cerebrospinal fluid to reduce the risk of traumatic brain injury and injuries to the spinal column. Reducing blood outflow further increases the intracranial pressure and volume, and thereby increases the pressure and volume of the cochlear fluid, the vitreous humor and the cerebrospinal fluid to thereby reduce the risk of injury to the inner ear, internal structure of the eye and of the spinal column. In addition, increasing intracranial pressure and volume reduces the likelihood of brain injury and any associated loss of olfactory function

The present application relates to a prosthetic valve prosthesis with an anchor, includes a bracket body having a passage for supplying blood flow and at least one fixing member, the fixing member isconnected with the bracket body, the fixing member includes a lower extension section and an upper extension section, one end of the lower extension section is connected with the bracket body as a fixed end, the other end of the lower extension extends proximally along the axis of the bracket body, extending distally in the opposite direction after passing through the bent region and connected tothe upper extension. The upper extension section is located on the outer side of the lower extension section, and a leaf receiving cavity is formed between the lower extension section and the upper extension section. The fixing member is further provided with a lamination device, and when the fixing member is completely released, the self-body leaf is stacked in the leaf receiving cavity. The clamping force of the fixation part of the prosthetic valve prosthesis is not influenced by the space between the stent body and the fixation part, and the influence on the blood outflow channel after thestent body is released is greatly reduced.

The invention relates to the field of medical devices, and particularly provides a device for eliminating pathogens in blood. The device for eliminating the pathogens in the blood comprises an external circulation path consisting of a blood exhalant (1), a plasma separator (2) and a blood return pipe (3) which are sequentially connected, and further comprises a pathogen physical deactivation device (5) connected with the external circulation path. The invention further provides a method for eliminating the pathogens in the blood, comprising the following steps: after the blood flows out from a patient body, blood cells and plasma in the blood are separated by the plasma separator; and after the pathogens in the plasma are physically deactivated through the pathogen physical deactivation device, the plasma flows back to the external circulation path and then flows back to the patient body in combination with the blood cells. The method adopts physical means and can reduce side effects. The device is simple in structure, and can be connected with other blood purification devices for use.

The invention relates to a haemostatic and wound dressing containing the same. The haemostatic is a single polysaccharide or single hydrogel particle, or is prepared by combining at least one polysaccharide onto the surface of a hydrogel particle in a physical or chemical combining way by virtue of polymerization reaction or grafting reaction, or mixing the hydrogel particle with a polysaccharideparticle; and the wound dressing contains the haemostatic. The haemostatic prepared by the invention can effectively stop hemorrhea threatening life in wound, haemostasis can be realized by adhering,pressing or applying the haemostatic onto a wounded part, formation of a blood plaque at the wounded part can be sped up, and meanwhile formation of a blood clot at the wounded part can be sped up, thus preventing blood drain at the wounded part and preventing blood outflow at the wounded part.

A method for augmenting blood flow in a limb that is wrapped with a sleeve having at least one chamber for applying compression to the limb in a region generally underlying the chamber includes pressurizing the chamber to a first compression pressure and then reducing the pressure to a refill pressure. Pressure in the chamber is then sensed to determine a first venous refill time. The preceding steps are repeated a second and other times using second and other compression pressures that are different from the first compression pressure and from each other to determine second and other venous refill times. A customized compression pressure is determined by locating the compression pressure at which blood flow out of the region generally underlying the chamber is maximized by finding compression pressure at a maximum venous refill time. A compression device employing such a method is also disclosed.

A system and method for non-invasively estimating an absolute blood flow of a vascular region in a subject using optical data are provided. In some aspects, the method includes acquiring optical datafrom the vascular region using one or more optical sensors placed about the subject, and determining, using the optical data, an index of blood flow and. a blood volume associated with the vascular region. The method also includes computing a blood inflow and a blood outflow using the index of blood flow and the blood volume, and estimating an absolute blood flow using the blood inflow and blood outflow. The method further includes generating a report indicative of the absolute blood flow of the vascular region.

A device for treating blood in an extracorporeal circuit comprising a venous blood reservoir having an inlet and an outlet, and a hemoconcentrator having a first inlet connector for the blood to be treated, a second outlet connector for the outflow of concentrated blood, and a third outlet connector for the outflow of the ultrafiltered liquid, wherein the hemoconcentrator is disposed within the venous blood reservoir and the hemoconcentrator and the venous blood reservoir are integrated into a single monolithic assembly, and wherein the hemoconcentrator comprises an enclosure containing structure suitable to concentrate blood.

A centrifugal blood pump with stable rotation, which includes a housing and an impeller installed in the housing. The housing is facing the center of the impeller with a positioning shaft matched with the center hole of the impeller; the impeller is installed on the upper cover and the lower cover The center of the spiral blood channel between; the upper cover and the lower cover are respectively provided with a blood inflow tube and a blood outflow tube communicating with the blood channel; the blades in the impeller include the main blade and the auxiliary blade connected to the outer end of the main blade; The main blades are evenly arranged along the circumference of the rotor, and the included angle between the main blades and the rotational flow direction of blood in the blood channel is an obtuse angle. The invention optimizes the design of the impeller and related structural design, so that the centrifugal blood pump has higher pumping efficiency at low speed, ensures blood arterial pressure, reduces wear at low speed, prolongs the life of the blood pump, and also reduces energy consumption. Low power consumption improves the battery life of the blood pump, and the low speed also reduces the difficulty of blood pump working pressure control, making it easier to use and operate.

The extracorporeal blood circulating apparatus of the present invention includes: a closed-type venous reservoir having a blood storage chamber and a volume adjusting chamber that are disposed adjacently by partitioning a closed space formed by a housing; an adjusting liquid tank for storing an adjusting liquid that is connected to the volume adjusting chamber; and a blood pump that is connected to the blood storage chamber. In the housing, an inflow port for allowing blood to inflow and an outflow port for allowing blood to outflow are provided so as to communicate with the blood storage chamber, and an adjusting port for injecting and ejecting the adjusting liquid is provided so as to communicate with the volume adjusting chamber. The blood pump is connected via the outflow port, and the adjusting liquid tank is connected via the adjusting port. The closed space is partitioned by a flexible septum member so as to form the blood storage chamber and the volume adjusting chamber, and the adjusting liquid tank and the adjusting port are connected by a conduit member having a configuration that can adjust a flowing amount. Control of a blood storage amount to be most appropriate and easy adjustment are possible throughout all steps from before starting an extracorporeal blood circulation to terminating it.

This artificial lung includes: a housing; a hollow fiber membrane layer that is housed inside the housing and in which a multitude of hollow fiber membranes having a gas exchange function are integrated; a gas inflow section and a gas outflow section that employ the lumen of each hollow fiber membrane as a gas flow path and that are provided respectively on the upstream side and the downstream side of the gas flow paths; a blood inflow section and a blood outflow section that employ the outside of the hollow fiber membranes as a blood flow path and that are provided respectively on the upstream side and the downstream side of the blood flow path; a first filter member that is provided in contact with the surface of the hollow fiber membrane layer on the side of the blood outflow section and covers almost the entire surface, the first filter member having the function of capturing bubbles in the blood; and a second filter member spaced away from the first filter member and arranged between the first filter member and the blood outflow section, the second filter member having the function of capturing bubbles in the blood.