21 results about "Venous filter" patented technology

The invention relates to the technical field of medical instruments, and provides a vena cava filter capturing guide wire and device. And the stop block is arranged on the peripheral wall of the guide wire and is fixed relative to the guide wire. When the capturing guide wire is used, a transcervical passage and a transfemoral passage are firstly established, and then a catheter or an adjustable bent catheter is conveyed to a filter through the transfemoral passage; then a guide wire firstly penetrates through a central hole of the filter through a catheter, then the capture device is used for pulling the guide wire out of the jugular vein through the jugular vein channel until resistance is felt, at the moment, the stop block abuts against the central hole of the filter, and then a recovery sheath for capture is inserted into a blood vessel through the jugular vein through the guide wire; when the recovery sheath reaches the position of a recovery hook of the filter, the filter can be corrected by pulling the guide wire, if the recovery hook is adhered, the guide pipe can be pushed along the guide wire and the recovery hook, and the filter is recovered while the recovery hook is stripped. And when the filter completely enters the recovery sheath, the recovery sheath and the guide wire are withdrawn to complete the recovery of the filter.

The invention provides a limiting structure of an umbrella-shaped vena cava filter, the limiting structure is applied to a vena cava filter conveying system, the vena cava filter conveying system comprises a filter which is arranged in an inner cavity of an intervention sheath tube in a folded state, and a plurality of open grooves extending in the axial direction are formed in the limiting structure in the circumferential direction; the second supporting arm and the third supporting arm respectively form a second limiting part and a third limiting part which extend into the open groove along the first direction, and the second limiting part and the third limiting part abut against the side groove wall of the open groove along the two circumferential sides and are in circumferential limiting fit with the open groove; the second limiting part and the third limiting part abut against the inner wall of the intervention sheath tube through shape memory restoring force of the second limiting part and the third limiting part, and radial gaps exist between the second limiting part and the bottom groove wall of the open groove and between the third limiting part and the bottom groove wall of the open groove. The problem that in the prior art, the second supporting arm and the third supporting arm are prone to interference or scratching in the withdrawing or releasing stage is solved, precise unfolding and safe withdrawing of the filter are achieved, and the instrument loss and the vascular injury risk are reduced.

The invention discloses an antibacterial compound containing shellac nanoparticles and a preparation method of the antibacterial compound, and belongs to the technical field of medical materials. The antibacterial product is a polylactic acid-glycolic acid copolymer (PLGA) loaded shellac nanoparticle antibacterial coating or hyaluronic acid (HA) loaded shellac nanoparticle antibacterial gel. The coating and the gel prepared by the invention have excellent antibacterial performance and good biocompatibility, and the preparation method is relatively simple. The antibacterial coating can be applied to the surfaces of medical instruments such as intravascular stents, artificial heart valves, artificial blood pumps, artificial blood vessels, catheters and vein filters to improve the antibacterial performance of the medical instruments, and can also be applied to the surfaces of skin and mucosa to improve the antibacterial performance.

The application discloses a degradable intelligent variable shape vein filter, which comprises a ring-shaped support structure and a filter screen, wherein the support structure and the filter screen are made of degradable materials; the degradable material for preparing the filter screen comprises a shape memory functional material, the shape memory functional material has a deformation temperature higher than a human body temperature, and a sensitive material is added in the degradable material of the filter screen; at least a part of the filter screen is in a contracted state of being contracted inwardly from the support structure under a condition of being lower than the deformation temperature; after the filter screen is implanted into a human body, the sensitive material is excited to generate heat to reach the condition of the deformation temperature through an external field, and the filter screen is deformed and expanded to a ring surface where the support structure is located. The vein filter is completely degradable, does not need to be taken out, can be attached to a blood vessel wall and gradually endothelialized after a filtering function is completed, does not generate degradable fragments, does not have partial displacement, has good biocompatibility, and can ensure that the blood vessel is unobstructed for a long time.

The invention relates to the technical field of medical equipment, in particular to a convertible vena cava filter and a combination thereof. The convertible vena cava filter comprises a supporting device, a constraint line and a constraint piece, the restraint line is made of a non-degradable material, and the restraint piece is made of a degradable material so as to restrain the restraint line to form an annular structure; the supporting device comprises a plurality of supporting parts, one end of each supporting part can be limited by a constraint line to form a contraction structure, and the other end of each supporting part forms an expansion structure; and the constraint line is fixedly connected with the supporting part. According to the convertible vena cava filter provided by the invention, the restraint part provides a restraint effect for the restraint line, so that the supporting device is of an umbrella-shaped structure, after the restraint part is degraded and the restraint line loses efficacy, the supporting part is bounced off and is supported on a blood vessel wall, and the restraint line is fixed on the supporting part, so that the problem of pulmonary embolism caused by falling of the restraint line is avoided; the problem that an umbrella-shaped structure and a lantern-shaped structure are difficult to recycle is solved, and the advantages of the umbrella-shaped structure and the barrel-shaped structure are achieved at the same time.

The invention provides a vena cava filter conveying system and a control method thereof. The vena cava filter conveying system comprises a conveying sheath tube, a sealing assembly, a pushing assembly and a filter. The sealing assembly is arranged at the near end of the conveying sheath tube, the filter is contained in an inner cavity of the conveying sheath tube, and the pushing assembly continuously extends to the inner cavity of the sealing assembly and the inner cavity of the conveying sheath tube and drives the filter to move relative to the conveying sheath tube. The far end of the pushing assembly is provided with a limiting piece. The filter is provided with a plurality of groups of supporting structures which are distributed at equal intervals along the circumferential direction and have gradually increased lengths along the first direction; the supporting structure is propped between the conveying sheath tube and the radial direction of the limiting piece in a folded state, and the supporting structure in the folded state moves in the inner cavity of the conveying sheath tube in the first direction or the second direction opposite to the first direction through the pushing effect of the limiting piece. Through the application, the filter is accurately released at a proper position of the inferior vena cava, and the risk of thrombus shedding or filter displacement is reduced.

The invention relates to the technical field of medical instruments, and discloses a vena cava filter recovery system and method.The recovery system comprises a vena cava filter and a recovery device, and the recovery device comprises a guide device, a snare, a recovery sheath and a guide wire; the guide device comprises a connecting rod and a guide fixing claw, a central cavity capable of containing a guide wire is formed in the connecting rod, a recycling groove is formed in the outer side of one end of the connecting rod, the guide fixing claw is arranged at the end, close to the recycling groove, of the connecting rod, and the guide device is clamped with a filter rib rod of the vena cava filter through the guide fixing claw. The position of the vena cava filter is adjusted; the recovery sheath can contain the snare, the guide device and the vena cava filter, and a guide fixing claw of the guide device can penetrate through the recovery sheath to enter a blood vessel; the snare is used for capturing the filter recovery hook of the vena cava filter and recovering the vena cava filter into the recovery sheath. The guide device is additionally arranged to adjust the position of the vena cava filter in the blood vessel, and recycling is further facilitated.

The utility model discloses a vein filter screen recovery trapper which comprises a sleeve, and a sleeving assembly is arranged in the sleeve. The sleeving assembly comprises a hard guide wire, the hard guide wire is longer than the sleeve, and the bottom of the hard guide wire is spiral; a casing pipe is arranged in the sleeve, a lasso is arranged in the casing pipe, and the lasso forms a lantern ring at the bottom of the casing pipe. The hard guide wire is used for stripping the filter screen from the blood vessel wall, the problem that the filter screen is difficult to strip is solved, the hard guide wire can penetrate into any gap hole of the filter screen, a hook of the filter screen does not need to be hooked, and operation is easier. The ball body can enable the hard guide wire to rotate more smoothly, and the ball body can also prevent the end part of the hard guide wire from being hung on the inner wall of the blood vessel and being incapable of moving; and the ball body can also prevent the hard guide wire from being separated from the lantern ring.

An embolus filter introducer system has a symmetric introducer sheath with a filter inside. The introducer sheath can be attached at either end to a deployment actuator. The deployment actuator can thereby be used to push the filter out of the introducer sheath. Since the sheath can be oriented in a selectable direction, so can the filter, allowing the sheath to be introduced via a jugular or femoral approach to the vena cava.

The vena cava filter comprises a conveying pipe, a pushing pipe, a filter screen and an expander, a cover cap is arranged at the far end of the conveying pipe, an opening is formed in the cover cap, the pushing pipe is movably inserted into the conveying pipe relatively, the expander is movably inserted into the conveying pipe and the filter screen, and the filter screen has a containing state and a working state. When the filter screen is in a storage state, the filter screen is located in the conveying pipe and is folded into a pipe shape, when the filter screen is in a working state, the filter screen is located outside the far end of the conveying pipe and is self-expanded into a funnel shape, the pushing pipe is used for pushing the filter screen to enable the filter screen to extend out of the far end of the conveying pipe, and the cap is pushed by the filter screen to deform, so that the opening is enlarged. And the maximum inner diameter of the enlarged opening does not exceed the inner diameter of the conveying pipe. According to the utility model, the delivery tube, the pushing tube, the filter screen and the dilator are coaxial and integrated, so that the operation is more convenient, and the risk that the far end of the delivery tube shovels the blood vessel wall in the pushing process can be avoided.

The invention relates to a vena cava filter and a capturing and recycling device thereof, and relates to the field of interventional medical instruments.The vena cava filter comprises a filter screen and a recycling pipe, the recycling pipe is arranged at the end of the filter screen, a recycling pipe cavity is formed in the recycling pipe, a clamping hook groove is formed in the inner wall of the end of the recycling pipe cavity, and an elastic clamping hook is arranged in the clamping hook groove; one end of the elastic clamping hook is fixed in the clamping hook groove, the other end of the elastic clamping hook extends towards the filter screen, the end part of the elastic clamping hook extends into the recycling pipe cavity, and a recycling guide magnet spaced from the clamping hook groove is arranged in the recycling pipe cavity. The vena cava filter catching and recycling device comprises a recycling sleeve and a recycling guide wire, a catching head is arranged at one end of the recycling guide wire, the recycling guide wire penetrates through the recycling sleeve, the catching head comprises a catching guide magnet, the magnetism of the opposite ends of the catching guide magnet and the recycling guide magnet is opposite, and a clamping groove is formed in the side wall of the catching head; and the clamping groove and the clamping hook groove are correspondingly arranged, so that the recovery difficulty of the vena cava filter can be reduced.

The invention provides a vein filter and a recovery device thereof, the vein filter comprises a recovery mechanism and a filtering mechanism, the filtering mechanism is composed of a plurality of filtering arms, the roots of the filtering arms are connected with the recovery mechanism, the recovery mechanism comprises a funnel part, a fixing part and a connecting part, and the funnel part, the fixing part and the connecting part are fixedly connected in sequence; a funnel cavity is formed in the funnel part, an expansion fixing cavity is formed in the fixing part, and a passing cavity is formed in the connecting part; the wide-opening end of the funnel cavity is communicated with the outside, the narrow-opening end of the funnel cavity is communicated with one end of the expansion fixing cavity, and the other end of the expansion fixing cavity is communicated with one end of the passing cavity; the maximum inner diameter of the expansion fixing cavity is larger than the inner diameter of the narrow opening end of the funnel cavity. The funnel type recovery mechanism is matched with the catheter provided with the balloon, so that the technical problems in the prior art that the filter is difficult to take out when inclining and the recovery operation is difficult are solved.

The present invention relates to the technical field of implantable medical devices, and in particular to an intracavitary implant structure, and more particularly to a vena cava filter. Specifically disclosed are an intracavitary implant structure and a vena cava filter having the structure, comprising a central portion having a central axis and a functional portion having an outer periphery composed of a plurality of rods extending outward from the central portion. By improving the arrangement, structure and shape of the rods constituting the functional portion, the implant has better neutropenia and other effects.

The utility model discloses a vena cava filter which comprises a filter body and a plurality of supporting assemblies arranged outside the filter body and supported on a blood vessel wall, the supporting assemblies are arranged in the circumferential direction of the filter body at intervals, and each supporting assembly comprises a wall attaching piece attached to the blood vessel wall and a connecting piece connected between the filter body and the wall attaching piece. The connecting piece is made of a degradable metal material, the wall attaching piece is made of a degradable high polymer material, and the filter main body is made of a metal material; when the vena cava filter is arranged in a blood vessel, the filter main body is not in contact with blood in the blood vessel, and a spacing distance is formed between the outer contour surface of the filter main body and the blood vessel wall; the connecting piece is in direct contact with blood in a blood vessel, the filter main body and the connecting piece can be indirectly communicated with a positive electrode and a negative electrode of a power supply respectively, and when current passes through the connecting piece, the connecting piece can be electrolyzed to separate the filter main body from the connecting piece. The vena cava filter can be implanted into the blood vessel of a patient for a long time and cannot damage the blood vessel when taken out.

The application relates to a vena cava filter and a filter recovery system. The vena cava filter comprises a filter component for intercepting thrombus and a recovery component comprising a recovery seat, a recovery hook and a rotating assembly. The recovery seat is arranged at the proximal end of the filter component. The rotating assembly is connected to the end of the recovery hook and movably arranged in the recovery seat. The recovery hook is rotated relative to the recovery seat through the rotating assembly to adjust the position and / or orientation of the recovery hook relative to the filter component. The movable installation of the recovery hook into the recovery seat through the rotating assembly can realize the position and / or orientation adjustment of the recovery hook during hooking, facilitates the hooking recovery of the recovery hook from different angles, increases the adjustable performance of the recovery hook, adjusts the azimuth angle of the recovery hook, adjusts the recovery hook to a position far away from the blood vessel, reduces the recovery difficulty and facilitates the recovery operation.

The invention relates to the technical field of medical equipment, in particular to a convertible vena cava filter and a combination thereof. The convertible vena cava filter comprises a supporting device and a restraining ring. The supporting device comprises a plurality of supporting parts, one end of each supporting part can be limited by the restraint ring to form a contraction structure, and the other end of each supporting part forms an expansion structure; the restraint ring is made of a degradable material and comprises a plurality of limiting parts and a plurality of connecting parts, every two adjacent limiting parts are connected through the corresponding connecting part, and the limiting parts are fixed to the supporting part; the connecting part is made to be degraded prior to the limiting part. According to the convertible vena cava filter and the combination thereof, the connecting part is degraded prior to the limiting part, the supporting part is bounced off and supported on the blood vessel wall, the risk that degradable materials fall off is reduced, the problem that an umbrella-shaped structure and a lantern-shaped structure are difficult to recycle is solved, and the convertible vena cava filter and the combination thereof have the advantages of the umbrella-shaped structure and the barrel-shaped structure at the same time; and the problem of pulmonary embolism caused by falling of the degradable material is also avoided.

The utility model relates to the technical field of medical instruments, and discloses a thrombus taking device and a thrombus removing device. The thrombectomy device comprises an expandable net, the expandable net has an expanded state and a contracted state; in the expansion state, the maximum radial size position of the expandable net is used for abutting against a blood vessel; a plurality of openings are formed in the near end of the expandable net and are arranged in the axial direction; the opening area of the opening is larger than the area of meshes of the expandable net; the radial size of the collecting cavity of the expandable net is firstly increased and then reduced along the axial direction of the expandable net from near to far, and the hole area of the net holes is gradually reduced; and the total length L of the thrombectomy device is 2-5 times of the maximum radial size D of the collection cavity. The thrombus taking device solves the problems that in the thrombus removing technology of an existing rotary percutaneous mechanical thrombus removing device, the surgical operation difficulty is large, thrombus remaining on the blood vessel wall cannot be treated, and a vena cava filter cannot play a role in intercepting small thrombus and is poor in passing ability in the blood vessel.

The application relates to the technical field of medical devices, and discloses a recovery system and a recovery method for a vena cava filter, the recovery system comprising a vena cava filter and a recovery device, the recovery device comprising a guide device, a snare, a recovery sheath and a guide wire; the guide device comprises a connecting rod and a guide fixing claw, a central cavity capable of accommodating the guide wire is arranged in the connecting rod, a recovery groove is formed in the outer side of one end of the connecting rod, the guide fixing claw is arranged at one end of the connecting rod close to the recovery groove, the guide device is connected with the filter rod of the vena cava filter through the guide fixing claw and is used for adjusting the position of the vena cava filter; the recovery sheath can accommodate the snare, the guide device and the vena cava filter; the guide fixing claw of the guide device can pass through the recovery sheath and enter the blood vessel; the snare is used for capturing the filter recovery hook of the vena cava filter and recovering the vena cava filter into the recovery sheath. The position of the vena cava filter in the blood vessel is adjusted through the guide device, and the recovery is further facilitated.

The invention discloses a controllable release vein filter which comprises a filter body and a push rod, the filter body comprises an end pipe, a filter rod and a movable unit, the end pipe is provided with a groove part, an annular limiting part and an annular limiting protrusion are fixed to the end pipe, and the annular limiting protrusion is fixed to the end pipe. The annular limiting part comprises an annular limiting seat, an annular block, a first annular connecting plate with a plurality of first through holes and a second annular connecting plate with a plurality of second through holes; the movable unit comprises a movable plate, a movable column and a plurality of elastic rods fixedly connected with the movable plate; a connecting rod is connected between every two adjacent filter rods, an abutting rod is connected between each connecting rod and the corresponding movable column, a memory alloy unit is arranged between the annular block and the movable plate, and the memory alloy unit is in a spring shape in the austenitic phase; and the push rod comprises a rod body, an end part circular ring rod and a plurality of connecting blocks for connecting the rod body and the end part circular ring rod. The filter provided by the invention can realize controllable release.

The embodiment of the present specification provides a vena cava filter, comprising: a stent part having a telescopic state, being in contact with a vena cava wall after being unfolded, and being formed with a hollow channel; a filter part being arranged in the hollow channel, one end of the filter part being in a radial structure and being connected with the stent part, the other end of the filter part being in a converging state and being suitable for collecting embolic materials; and the filter part comprising: a degradable structure and a non-degradable coating layer coated on the degradable structure, and the degradable structure being suitable for being degraded after the non-degradable coating layer is removed. By using the above scheme, the transformation process of the vena cava filter can be controlled, and the embolic materials in the vena cava wall can be more effectively treated.

The utility model relates to a test device for blood clot capture and anti-displacement performance of a vena cava filter, which comprises a constant-temperature fluid cavity, a thrombus loader communicated with the constant-temperature fluid cavity and a test cavity communicated with the thrombus loader, and the test cavity is communicated with the constant-temperature fluid cavity to form a fluid loop. The condition of the vena cava filter in an actual human body environment is observed by simulating a human body blood loop, so that the blood clot capturing and anti-displacement performance of the vena cava filter is evaluated, the testing device can test different types of vena cava filters and adapt to different human body environments, and comprehensive testing and evaluation of the vena cava filter are achieved.