43 results about "Inferior vena cava filter" patented technology

An inferior vena cava filter (340) for use in the inferior vena cava (4) to capture thrombus (8) passing through the inferior vena cava (4) towards the heart and lungs to prevent pulmonary embolism comprises a proximal support hoop (302), a distal support hoop (312) and a plurality of support struts (303) extending between the proximal support hoop (302) and the distal support hoop (312). The filter (340) also comprises a plurality of capture arms (121) which are movable from a capturing configuration to an open configuration. The capture arms (121) are biased towards the open configuration. A biodegradable suture holds the capture arms (121) in the capturing configuration.

A temporary inferior vena cava filter including a guidewire and a doublet cage filter distally located on the guidewire. The doublet cage filter has a proximal cage filter and a distal cage filter, both of resilient and biased toward their expanded or deployed state. The proximal and distal cage filters may be collapsed by actuation, preferably with a sheath. A method of protecting from pulmonary embolism during treatment of a deep vein thrombosis is disclosed. The doublet cage provides stability when deployed in the inferior vena cava, is readily retrieved and readily manufactured. A method of manufacturing the doublet cage filter assembly is also disclosed and involves a nitinol tube with plural cuts to form struts which are heat treated in an expanded state.

The present invention relates generally to a medical device and method of use, and more specifically to a method and apparatus with coaxial components used to treat venous diseases. The apparatus according to various embodiments operates as an inferior vena cava filter, a clot puller, a clot shredder, and as a prosthetic venous valve.

A filter having a first set of members and a second set of members defining a trap sized to fit into a blood vessel. Each of the first and second members are configured to resiliently extend from the trap. At least one of the first set of members includes a first surface for engaging the vessel wall such that the at least one of the first set of members resists downstream movement within the vessel. At least one of the second set of members includes a second surface for engaging the vessel wall such that the at least one second member resists upstream movement within the vessel.

The present invention relates to a vascular filter including a coiled wire formed of a shape memory material for implantation into a vessel. The vascular filter captures particulates within the blood flow in the vessel, without substantially interfering with the normal blood flow. Prior to implantation, the coiled wire is generally elongated and thereafter it reverts to a predetermined shape that is suitable for filtering the blood flow. The predetermined shape of the vascular filter includes a plurality of loops coaxially disposed about a longitudinal axis and has a conical portion and a cylindrical portion.

The present invention provides an intravascular filter for minimally invasive deployment into, and extraction from, a blood vessel. The invention comprises an inferior vena cava filter used to prevent migration of clots into the pulmonary artery wherein the filter has a novel architecture such that the filter can be extracted from the vessel without substantially damaging the vessel, even after prolonged periods of deployment.

Indwelling temporary inferior vena cava filter systems are disclosed. Such filter systems provide for easy removal of the filter without the need for additional invasive procedures and provide for dissolution and aspiration of captured emboli. Methods of using such systems for the dissolution, capture and removal of emboli are described.

The invention discloses a preparation method of a recyclable surface film of an inferior vena cava filter based on (PEG) polyethylene glycol-like, which comprises the following steps of: feeding the inferior vena cava filter in a plasma polymerization vacuum chamber; when the vacuum degree reaches 0.5Pa, introducing argon gas with the flow of 2.5sccm and carrying out sputter cleaning for 15 minutes under the conditions that the radio-frequency power is 100W and the negative bias voltage is 80V; after the sputter cleaning is finished, vacuumizing the vacuum chamber to be 0.5Pa again; and introducing a reacting gas of tetraglycol dimethyl ether and depositing a plasma polymer thin film for 30-120 minutes under the conditions that the work pressure is 2-5Pa, the radio-frequency power is 5-30W, the negative bias voltage is 80V and the pulse duty factor is 10-100 percent. The inferior vena cava filter prepared by the method disclosed by the invention has strong binding force between the surface-like PEG thin film layer and the inferior vena cava filter and excellent bioremediation performance for resisting protein and cell from adhering.

The invention discloses a material with a biological anti-pollution function and a preparation method and application thereof, and relates to the technical field of biological materials. The material with the biological anti-pollution function comprises a base material, a polyaminophenol coating and a hyaluronic acid layer, Wherein the polyaminophenol coating is obtained by reaction of phenolic molecules and polyamine molecules. The preparation method comprises the following steps: forming the polyaminophenol adhesive coating on the base material by utilizing a phenol-amine chemical coating technology, and then covalently grafting hyaluronic acid by utilizing amino groups on the polyaminophenol adhesive coating to form a hyaluronic acid coating. After the coating is in contact with an aqueous solution, a hydration layer is formed on the surface to form a super-hydrophilic surface, so that adhesion, migration and proliferation of components, endothelial cells, smooth muscle cells, inflammatory cells and the like in blood and a coating modified material are effectively inhibited, and therefore, the material with the biological anti-pollution function can be prepared and formed as follows: a vena cava filter, an artificial heart inner wall anticoagulation surface, an artificial heart-lung machine anticoagulation surface and the like.

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.

The invention discloses a material with a biological anti-pollution function as well as a preparation method and application thereof, and relates to the technical field of biological materials. The functional material for biological decontamination comprises a base material, a poly(phenol-amine) coating layer and a super-hydrophilic coating layer, wherein the poly(phenol-amine) coating layer and the super-hydrophilic coating layer are formed on the base material, wherein the poly(phenol-amine) coating layer is obtained by reacting a polyphenol compound containing carboxyl and polyamine macromolecules. The preparation method comprises the steps: forming the poly(phenol-amine) adhesion coating layer on the base material by utilizing a phenol-amine chemical coating technology, and then covalently grafting hyaluronic acid by utilizing amido on the poly(phenol-amine) adhesion coating layer to form a hyaluronic acid coating layer. When the coating layer is in contact with water, a hydration layer is formed on the surface of the coating layer, and a super-hydrophilic surface is formed, so that adhesion, migration and proliferation of components, endothelial cells, smooth muscle cells, inflammatory cells and the like in blood are effectively inhibited; therefore, the material or instrument with the biological anti-pollution function, such as an inferior vena cava filter or a central venous catheter or an artificial heart auxiliary pump with a recyclable function, can be prepared.

Retrievable inferior vena cava filters are disclosed. Such filters provide for easy removal of the filter and provide drug delivery for dissolution of captured emboli. Methods of using such systems for the prevention, capture, dissolution and removal of emboli are described.

A medical device for retrieving an inferior vena cava filter from an inferior vena cava having a handle having a distal end, wherein a longitudinal axis is defined thereby; a grasping assembly coupled to the handle, wherein the grasping assembly comprises a grasper for grasping the inferior vena cava filter positioned within the inferior vena cava, and an articulation assembly coupled to the grasping assembly for causing the grasping assembly to move laterally with respect to the longitudinal axis of the handle. Methods of retrieving an inferior vena cava filter from an inferior vena cava are also disclosed.

The invention belongs to the technical field of medical devices, and discloses a novel inferior vena cava filter system and an intelligent recovery system thereof. The system is provided with a pulling hook positioned at one end, the pulling hook is connected with a connecting strip, the connecting strip penetrates a filter, one end of the connecting strip extends out of the filter, the middle ofthe filter comprises a degradable section, and a compression spring is arranged between the filter and the connecting strip. According to the system, the middle of the filter is set into the degradable section, two ends of the filter are set into non-degradable sections, and the degradable section can be completely degraded after the filter is placed into an in-vivo blood vessel. The filter is changed into two separate filters after the degradable section is completely degraded, and the filter is contracted under the action of the spring and recovered by the pulling hook. The system is reasonable in structure, safe, firm, reliable in performance and convenient to operate and use and provided with an ideal recyclable vena cava filter.

The invention relates to the technical field of medical instruments, and in particular relates to a postcava filter being capable of being placed for a long term and provided with an anti-proliferation and antithrombus medicine coating. The postcava filter comprises a branch pipe, a pipe sleeve and a plurality of metal filtering wires, wherein two ends of the metal filtering wires are respectivelyconnected in the branch pipe and the pipe sleeve, and the metal filtering wires are convex outwards, so that a filtering cage is formed; the branch pipe and the pipe sleeve are made of a soft material; a first medicine coating used for resisting thrombus coats each metal filtering wire. According to the postcava filter, the thrombus can be intercepted through the metal filtering wires, so that embolism seldom occurs, due to the first medicine coatings on the metal filtering wires, the taking-out time of the filter can be prolonged, meanwhile, the occurrence rate of a series of complications including the difficulty in taking out, the injuries or tearing of the blood vessels, and the like which are caused by too late taking out can be reduced, the branch pipe and the pipe sleeve sleeve twoends of the metal filtering wires, so that the blood vessels are seldom injured. The postcava filter is strong in practicability and convenient to operate.

The invention relates to an inferior vena cava filter which comprises a filter main body, wherein the filter main body is made of nickel-titanium alloy and can be bound to a loader or can be released and unfolded in a blood vessel; the inlet end of the filter main body is provided with first internal threads connected with a conveyor. The invention aims at providing a simple and convenient inferior vena cava filter which is novel in structure, obvious in effect, easy to fix, accurate to embed, good in thrombus collection effect and less in influence on blood flow and is a novel intervention-type treatment device capable of replacing traditional drug therapy such as anticoagulation and thrombolysis or other surgical operation treatment methods. The invention further provides a preparation method of the inferior vena cava filter.

The invention relates to a postcaval filter. The postcaval filter comprises a supporting piece and a filtering piece, and the supporting piece is made of a degradable first material and is of a net-pipe-shaped structure with the two ends large and the middle small. The filtering piece is made of a degradable second material and comprises a first filtering part, a condensation part and a second filtering part which are connected in sequence, the cross section of an inner cavity of the first filtering part is gradually reduced in the direction from the first opening end to the condensation part,and the cross section of an inner cavity of the second filtering part is gradually reduced in the direction from the second opening end to the condensation part. No matter which direction blood flowpasses through, the blood flow needs to pass through the first filtering part and the second filtering part, mechanical blocking on thrombus is effectively achieved, thrombus is finally gathered at the position of the condensation part, and the thrombus capture rate is high.

The invention relates to an inferior vena cava filter in medical devices, in particular to a temporary inferior vena cava filter with no need of removing. The problems are solved that an existing permanent inferior vena cava filter causes blocking of the inferior vena cava, and an existing inferior vena cava filter capable of being removed needs to be removed through a second operation. Accordingto the technical scheme, the temporary inferior vena cava filter is provided with a waved annular supporting ring supported on the inner wall of a blood vessel, a plurality of filter rods are arrangedaround a ring body of the supporting ring at intervals and axially stretches out, the stretching ends of the filter rods are gathered by a biodegradable silk thread to one position, and the filter rods with the gathered stretching ends form a filter screen for filtering thrombi. After the biodegradable silk thread is degraded to release the stretching ends, the filter rods recover the elasticityto make the filter rods axially attached to the inner wall of the blood vessel.