39 results about "Venous filter" patented technology

A system, method and apparatus for performing a renal replacement therapy is provided. In one embodiment, two small high flux dialyzers are connected in series. A restriction is placed between the two dialyzers in the dialysate flow path. The restriction is variable and adjustable in one preferred embodiment. The restriction builds a positive pressure in the venous dialyzer, causing a high degree of intentional backfiltration. That backfiltration causes a significant flow of dialysate through the high flux venous membrane directly into the patient's blood. That backfiltered solution is subsequently ultrafiltered from the patient from the arterial dialyzer. The diffusion of dialysate into the venous filter and removal of dialysate from the arterial dialyzer causes a convective transport of toxins from the patient. Additionally, the dialysate that does not diffuse directly into the patient but instead flows across the membranes of both dialyzers provides a diffusive clearance of waste products.

The need for a venous reservoir in a heart-lung machine is obviated by using a vacuum-purged negative-pressure air filter in the venous return line ahead of the main blood pump. The purging vacuum for the venous air filter can also be used to purge air from the cardiotomy reservoir if a backflow-preventing valve is used on the venous air filter.

The invention discloses a vena cava filter. The vena cava filter comprises a filtering part, a binding part and a combining part, wherein the filtering part is arranged in the mode that the filtering part partially abuts against the inner wall of the vena cava; the binding part is made of biodegradable materials and is arranged in the mode that the binding part is connected with the filtering part at multiple positions and binds the filtering part; the combining part is arranged in the mode that the adjacent positions of the filtering part are connected with one another. Before the binding part is degraded, the vena cava filter is bound by the binding part to be of a cutting structure suitable for cutting thrombus flowing through the vena cava, and after the binding part is completely degraded, the vena cava filter is transformed into a support structure suitable for supporting the vena cava. The vena cava filter can be transformed into the support structure from the cutting structure more accurately after a period of preset time. The vena cava filter has the advantages of a conventional vena cava filter, for example, the vena cava filter is arranged in a minimally invasive surgery, the pain of a patient is little, and the side effects are low. A secondary surgery caused by recovery of the filter is avoided, and the relevant cost and the pain of the patient are further reduced.

The invention belongs to the field of the human planting instrument of the biological medical paderial and concretely relates to a device used in the blood vessel and more particularly is the device for filtering and catching the thrombus or other block-shaped objects in the vena cava. The device includes an upper layer of sieve and a lower layer of sieve which are linked by a connecting rod which is arranged at the centers of the sieves and all consist of a plurality of unidirectional and parallel filtering silks which are introduced from the centers of the sieves, and the filtering silks are shaped like chrysanthemum petals which are spread from the centers of the sieves to the edges. The filtering silks of the upper layer of sieve are distributed more closely than the filtering silks of the lower layer of sieve. The invention arranges two layers of sieves, so the lower layer of sieve, which is provided thin filtering silks, is used to filter the bigger thrombus; the upper layer is provided with a net-shaped sieve with smaller consistency, or the filtering silks of the upper layer are distributed denser to filter the smaller thrombus. In addition, both of the two layers can keep certain area as a blood stream passage to ensure the blood stream flows freely.

There is disclosed a trans-catheter cardiovascular device, comprising a composite material having gold nanoparticles embedded in a shape memory polymer. In an embodiment, the gold nanoparticles are surface-functionalized gold nanoparticles. In an embodiment, shape memory polymer is a cross-linked shape memory polymer. In various embodiments, the shape memory polymer forms one of a stent, an embolic coil, a venous filter, a vascular graft, and a cardiac septal defect closure device. Other embodiments are also disclosed.

A device for retrieval of a vena cava filter is provided. The retrieval device has, approximately, an umbrella shape and consists of a central shaft; a plurality of frame struts, attached to frame strut attachment points on the central shaft and disposed radially about the central shaft; and a plurality of snare wires. The retrieval device has a collapsed configuration for insertion and removal from a blood vessel of a patient and an expanded state for capturing an intravascular filter in the blood vessel of the patient. The plurality of snare wires provides multiple points at which a vena cava filter, particularly one that has become misaligned during deployment or treatment, can be caught. The frame struts can be substantially sinusoidal in shape and made of shape memory metal, such as Nitinol. The snare wires can be made of a biocompatible material such as silk, polyester, polypropylene, or nylon.

An extracorporeal reservoir device including a housing, a venous inlet sub-assembly, and a venous filter. The venous sub-assembly is mounted to the housing and includes a downtube and a luer port connector body. The connector body extends from the downtube and forms a passageway open to a lumen of the downtube. The connector body is arranged such that fluid flow from the passageway merges with a flow path of fluid along the primary lumen at an angle of less than 90°. Secondary blood flow through the port connector body is less likely to induce turbulent flow into venous blood flow within the downtube, and is thus less likely to break up any bubbles carried by the venous blood. For example, at port flow rates of less than 500 mL/minute, fluid flow from the port connector body does not induce turbulent flow into fluid flowing through the primary lumen.

A vascular filter system and method are disclosed. In one embodiment, the filter system comprises a dispensing needle, a guidewire and a catheter releasably attached to a filter dispenser which stores a length of filter wire. The filter wire dispenser has a guide tube which guides the filter wire into the catheter and then into a vein during surgical implantation. The filter wire is configured to form into a predetermined shape as it is deployed from the needle. The shape of the filter wire captures blood clots in the blood stream. The filter wire may be configured with a perforated section and a non-perforated section. Perforations are in fluid communication with an inner hollow lumen in the filter wire.

The invention provides a recoverable lotus petal type double-layer point support vena cava filter and a manufacturing method thereof. The invention relates to a double-layer lotus petal type point support vena cava filter. The filter comprises a recyclable column, a front filter screen, a rear filter screen and a net end fixing hook portion, wherein the recyclable column is located at the end of the filter, and the upper part of the recyclable column is provided with a recovery hook; the front filter screen and the rear filter screen are defined by a plurality of nickel-titanium alloy filter wires which are scattered all around from the center of the recovery column and have arc-shaped petal shapes to improve the support rigidity, and are in front and rear interlacing, so that the meshes of the filter are more uniform, and the interception rate of thrombus is effectively increased under the premise of ensuring sufficient blood circulation area and smooth blood circulation; fixing hooksare distributed at the arc-shaped petal ends of the front and rear filter screens, and are in point contact with the blood vessel during work, which reduces the damage to the blood vessel caused by recovery of the filter. At the same time, the filter screen is divided into front and rear parts, and support points are also divided into front and rear parts, which prevent the rotation of the filterand improve the stability of the point support filter in the blood vessel, thus minimizing the risk of overall offset of the filter during installation and use.

The invention discloses a novel recoverable type vena cava filter. The novel recoverable type vena cava filter comprises a recovery column, a first support column and a second support column, the first support column comprises a first connecting column and a first locating column, the second support column comprises a second connecting column and a second locating column, the upper ends of the first connecting column and the second connecting column are connected with the recovery column, the upper end of the first locating column is connected with the lower end of the first connecting column,the upper end of the second locating column is connected with the lower end of the second connecting column, and locating hooks are arranged at the lower ends of the first locating column and the second locating column; a filter column is arranged between the two adjacent support columns, the upper end of the filter column is connected with the recovery column, and two filter wires are arranged at the lower end of the filter column. When the novel recoverable type vena cava filter is used, the hooks on the first locating column and the second column are penetrated into the vessel wall, dual locating is achieved, the stability of the vena cava filter is guaranteed, the phenomenon that the vena cava filter inclines under the impact of gravity or blood is prevented, and convenience is brought to recycling. In addition, the filter can perform dual filtering on the blood, and the filter effect on thrombus is improved.

The invention relates to a tube and wire combined vena cava filter, which comprises a guide tube and at least three guide wires. The guide wires all arranged in the guide tube and penetrate the guide tube; first ends of the guide wires extend out from the front end of the guide tube and woven fixedly to form a network structure; second ends, opposite to the first ends, of the at least three guide wires are provided with recovery hooks; the recovery hooks extend out from the rear end of the guide tube, and the recovery hooks face outwards and are uniformly distributed on the periphery of the guide tube. The guide wires are woven into the network structure for filtering large thrombi, and auxiliary filter and protection of the guide wires are realized by virtue of the guide tube, so that the large thrombi can be filtered effectively to prevent pulmonary embolism while structural stability, high strength, low cost and simplicity in manufacturing are realized. In addition, due to the three recovery hook structures, one of the recovery hooks is always not close to the blood vessel wall no matter what position and posture of the vena cava filter are in the vena cava, and accordingly the recovery hooks can be conveniently caught by a catching ring, and convenience in recovery of the whole filter is achieved.

The invention discloses a straight cylinder type metal cutting sheath which comprises a straight cylinder type metal cutting sheath body. The straight cylinder type metal cutting sheath body is provided with a vena cava filter recovery pipe, a vena cava filter recovery pipe groove and an annular cutting edge. The annular cutting edge is arranged at a sheath opening of the straight cylinder type metal cutting sheath body so as to be closely attached to the outer side of a vena cava filter metal rod, so the damage to blood vessel walls is small and few blood vessel wall tissue components are cutoff when the vena cava filter metal rod is stripped off. The propelling speed and amplitude of the cutting sheath can be controlled, so the vena cava blood vessel walls draw back to the outer side intime when adhesion tissue is cut off, the damage risk of the vena cava blood vessel walls is further reduced, and the operation safety is improved. The put-on sheath wall of the straight cylinder type metal cutting sheath has a small thickness, the situation that a recovered sheath embedded section cannot advance when the cross sectional area of a compressed vena cava filter and cut tissue is larger than the area of an inner cavity of the recovery sheath can be reduced or avoided, and it is avoided that the vena cava filter cannot be recovered.

Venous filters having at least two struts (110) each having a connected end and a non-connected end, wherein each of the struts includes a strut portion and an anchor portion (116), and wherein the strut portion and the anchor portion are attached via an electrolytically active thread (221, 222); and a head (118) that connects the connected ends of the struts, wherein the strut portion can be separated from the anchor portion at least in part by the application of an electrical current. The invention also includes a venous filter having at least two struts, wherein each of the struts includes a temperature sensitive portion and an anchor portion; wherein the anchor portion is separated from the temperature sensitive portion at least in part by changing the temperature around at least the temperature sensitive portion. Also included is a venous filter having a web (650) of dissolvable material; and at least two anchors (618), wherein the at least two anchors are configured to retain the web within a mammalian blood vessel.

The invention provides a vena cava filter, and relates to the field of medical instruments. The vena cava filter comprises a support frame and a filter body, The filter body comprises a fixed arm, an anchoring arm and a recovery hook; the near end of the fixed arm and the near end of the anchoring arm are both connected to the opposite end of the hooking end of the recovery hook, and an anchoring part is arranged at the far end of the anchoring arm, and the anchoring part is anchored to the inner side face of the support frame; in a release state, the support frame is unfolded to be cylindrical, and the far end of the fixed arm and the far end of the anchoring arm are opened around, so that the fixed arm and the anchoring arm are unfolded to be of an umbrella shape; and the anchoring part can be separated from the support frame under the condition that the recovery hook is applied with an external force for dragging towards the near end. The vena cava filter solves the problems that in the prior art, after a vena cava filter is released in a blood vessel, the implanted position is prone to bleeding, the filter implantation time is short, and a filter is difficult to take out safely; and meanwhile, the shifting of the filter can be avoided after the vena cava filter is released in the blood vessel.

The invention discloses an open vena cava filter which comprises a filtration part for thrombus filtration and a support part for filter fixing, wherein the filtration part comprises a first filtration part and a second filtration part that are arranged along a vein; the first filtration part and the second filtration part are in centrosymmetric structures; the first filtration part is connected with the second filtration part through a connecting part; the support part comprises a first support part and a second support part; the first support part is arranged on the first filtration part; and the second support part is arranged on the second filtration part. The open vena cava filter has good geometric stability and a long recycling cycle and can also be recycled or released directionally. The geometric stability of the filter is improved while a thrombus filtration effect is improved; inclination and displacement of the filter are reduced; the filtration parts on two sides adopt anunsymmetric design; the thrombus filtration effect is improved; filtration pieces adopt curly and arc mooring anchor designs; and injuries of vessel walls due to the filter are reduced.

The invention provides a vena cava filter which is characterized in that the arrangement direction of the vena cava filter is opposite to the arrangement direction of a traditional vena cava filter; and the position for collecting thrombi by using the vena cava filter provided by the invention is different from the position for collecting thrombi by using the traditional vena cava filter, wherein the thrombi are collected in a low-shear-force pointed region near the central axis of the vena cava vessel by using the traditional vena cava filter, and the thrombi are collected in a high-shear-force annular region close to the wall surface of the vena cava vessel by using the vena cava filter provided by the invention. As shown in the specification, the filter comprises seven parts including A, B1B2, C, D, E, F1F2 and G, the filter is similar to an umbrella shape or a cone shape, and all parts are composed of filaments the diameters of which are 0.5-1mm. By adopting the filter and scheme provided by the invention, the shear force acting on the thrombi captured by the vena cava filter can be improved, and the dissolution rate of the captured thrombi can be increased, thereby effectively lowering the probability of occurrence of a clogging event of the vena cava filter, and prolonging the service time of the vena cava filter. Thus, the vena cava filter provided by the invention has an important clinical application value.

The invention discloses a medicine vein filter and a manufacturing method thereof. The medicine vein filter comprises a filter body, a supporting structure arranged on the filter body, a medicine carrying tank formed in the contact part between the supporting structure and a blood vessel wall, and medicine arranged in the medicine carrying tank. According to the medicine carrying tank carrying themedicine and obtained through the manufacturing method, proliferation of endothelial cells is slowed down, the wrapping thickness of the endothelial cells on the filter is reduced, the recovering difficulty of the filter is greatly reduced, and due to the fact that proliferation of the endothelial cells is slowed down, the recovering time window of the filter is effectively prolonged.

The invention relates to the technical field of medical devices, and provides a vena cava filter. The vena cava filter comprises a filter body, the filter body comprises a plurality of filtering bodies, supporting bodies are arranged on the filtering bodies, the ends of one sides of the filtering bodies are located in a release end piece, the ends of the other sides of the filtering bodies are located in a recovery end piece, barb pieces are arranged at the positions, close to the side of the release end piece, of the joints of the filter bodies and the supporting bodies, hook pieces are arranged at the positions, close to the side of the recovery end piece, of the joints of the filter bodies and the supporting bodies, and a recovery opening and a recovery end are arranged on the recovery end piece; the supporting bodies are arranged on the filter bodies, so that the conditions of deformation, inclination, displacement, breakage and the like of the vena cava filter can be avoided; and the supporting bodies are prevented from being covered and wrapped by endothelial cells, in the process of taking out the vena cava filter, the situation that the vascular intima is damaged is avoided, and the vena cava filter can be released to intervene at the release end and the recovery end.