7 results about "Venous filter" patented technology

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 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 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 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 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.