Interventional instrument that is convenient to position

1 . An interventional instrument facilitating positioning, comprising:

a stent, which has a frame structure with at least one hollowed-out area and has an axis, the stent having a loaded state in which the stent is radially compressed and a released state in which the stent is radially expanded;

a sealing membrane, which is connected to the stent and seals at least part of the at least one hollowed-out area, wherein in the loaded state, the stent encloses a receiving space, and the sealing membrane is located in the receiving space, and wherein the sealing membrane is an inner sealing membrane that contacts an inside of the stent; and

at least one friction increasing member which is connected to the sealing membrane and separated from the stent, wherein the at least one friction increasing member is one or more strands configured with elasticity;

wherein the frame structure is configured as a meshed structure, each of the at least one hollowed-out area is configured as a mesh hole, and each of the at least one friction increasing member comprises:

an anchor portion connected to a portion of the sealing membrane sealing one of the mesh holes;

a support portion outside the sealing membrane in a radial direction of the stent; and

a protrusion portion extending from the support portion towards an outside of the stent for frictional positioning with an adjacent tissue;

wherein the anchor portion, the support portion and the protrusion portion separately use one or more strands, or at least two of the anchor portion, the support portion and the protrusion portion share one strand; and

wherein the anchor portion passes through the sealing membrane via at least one connection hole, and a part of the anchor portion located inside the sealing membrane is provided with an anchor head which is blocked by the at least one connection hole.

2 . The interventional instrument facilitating positioning of claim 1 , wherein the stent has an axial passage therein, and wherein in the released state, the axial passage is opened, or at least one leaflet is arranged in the stent for closing or opening the axial passage.

3 . The interventional instrument facilitating positioning of claim 1 , wherein the stent is provided with an auxiliary positioning structure for interacting with an adjacent tissue, and the auxiliary positioning structure is configured as a slip resistant texture on an outer surface of the stent.

4 . The interventional instrument facilitating positioning of claim 1 , wherein the stent is configured to be circumferentially expanded during release, and the sealing membrane is configured to act with the circumferential expansion of the stent to drive the at least one friction increasing member to change a radial position of the at least one friction increasing member; and wherein

in the loaded state, the at least one friction increasing member is entirely located in the receiving space of the stent; and

in the released state, the at least one friction increasing member extends partly to an outside of the stent radially.

5 . The interventional instrument facilitating positioning of claim 1 , wherein at least a portion of the sealing membrane is configured as a driving portion corresponding to the respective hollowed-out area; and the driving portion is configured to be folded in the loaded state, with at least a portion of the respective friction increasing member surrounded by the folded driving portion.

6 . The interventional instrument facilitating positioning of claim 5 , wherein an edge of the driving portion contacts a radial inside of the stent.

7 . The interventional instrument facilitating positioning of claim 1 , wherein the at least one friction increasing member comprises a plurality of friction increasing members; and in the released state, the friction increasing members are distributed in a circumferential direction of the stent, and each of the friction increasing members corresponds to the respective mesh hole in position.

8 . The interventional instrument facilitating positioning of claim 7 wherein the plurality of friction increasing members are divided into a plurality of groups, each group comprises at least two of the friction increasing members that are arranged in a row along the circumferential direction of the stent, and adjacent groups are offset from each other in an axial direction and the circumferential direction of the stent.

9 . The interventional instrument facilitating positioning of claim 7 , wherein one or more friction increasing members are disposed within one of the hollowed-out areas.

10 . The interventional instrument facilitating positioning of claim 1 , wherein the anchor portion vertically passes through the sealing membrane.

11 . The interventional instrument facilitating positioning of claim 1 , wherein the support portion has a higher rigidity than the protrusion portion.

12 . The interventional instrument facilitating positioning of claim 11 , wherein the protrusion portion comprises one or more strand sections, and at least one of the strand sections is enlarged in diameter at an end thereof close to the sealing membrane to form the support portion, or at least one of the strand sections has a higher rigidity at an end thereof close to the sealing membrane than at the other end thereof away from the sealing membrane.

13 . The interventional instrument facilitating positioning of claim 1 , wherein the support portion is a gasket or a sleeve, and the protrusion portion extends through the support portion or abuts against the support portion.

14 . The interventional instrument facilitating positioning of claim 1 , wherein the protrusion portion is one or more branched strand sections of the strand.

15 . The interventional instrument facilitating positioning of claim 14 , wherein one end of the strand section away from the support portion is a free end which is further expanded than the rest of the strand section by untwisting or local hot melt deformation.

16 . An interventional instrument facilitating positioning, comprising:

a stent, which has a frame structure with at least one hollowed-out area and has an axis, the stent having a loaded state in which the stent is radially compressed and a released state in which the stent is radially expanded;

a sealing membrane, which is connected to the stent and seals at least part of the at least one hollowed-out area, wherein in the loaded state, the stent encloses a receiving space, and the sealing membrane is located in the receiving space, and wherein the sealing membrane is an inner sealing membrane that contacts an inside of the stent; and

at least one friction increasing member which is connected to the sealing membrane and separated from the stent, wherein the at least one friction increasing member is one or more strands configured with elasticity;

wherein the frame structure is configured as a meshed structure, each of the at least one hollowed-out area is configured as a mesh hole, and each of the at least one friction increasing member comprises:

an anchor portion connected to a portion of the sealing membrane sealing one of the mesh holes;

a support portion outside the sealing membrane in a radial direction of the stent; and

a protrusion portion extending from the support portion towards an outside of the stent for frictional positioning with an adjacent tissue;

wherein the anchor portion, the support portion and the protrusion portion separately use one or more strands, or at least two of the anchor portion, the support portion and the protrusion portion share one strand; and

wherein the anchor portion vertically passes through the sealing membrane.