3 results about "Venous filter" patented technology

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 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 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.