CN107174374B

CN107174374B - Filter with flexible connection

Info

Publication number: CN107174374B
Application number: CN201710318181.6A
Authority: CN
Inventors: 张庭超; 李阳
Original assignee: Hangzhou Wei Qiang Medical Technology Co ltd
Current assignee: Hangzhou Wei Qiang Medical Technology Co ltd
Priority date: 2017-05-08
Filing date: 2017-05-08
Publication date: 2022-04-15
Anticipated expiration: 2037-05-08
Also published as: CN107174374A

Abstract

The invention discloses a filter with flexible connection, which consists of a plurality of supporting rods, wherein flexible connecting pieces are arranged among the supporting rods; the flexible connecting piece is connected with the supporting rod, and the supporting rod is matched to form a crossed net structure for filtering. The invention provides a filter with flexible connection, which improves the filtering effect and does not increase the radial supporting force.

Description

Filter with flexible connection

Technical Field

The invention belongs to the field of medical instruments, and particularly relates to a filter, in particular to a filter with flexible connection.

Background

Pulmonary Embolism (PE) is a common health problem and an important factor in death in all age groups. Most pulmonary embolisms are caused by Deep Vein Thrombosis (DVT) in the lower limb or pelvis, by which blood clots may migrate through veins back to the heart and into the lungs, resulting in a pulmonary infarction due to loss of blood and oxygen supply to a portion of the lungs.

In current treatment protocols, the use of filters can prevent and reduce the occurrence of pulmonary embolism with anticoagulation contraindications or ineffective anticoagulation. In the prior art, a common vena cava filter with a cage-shaped structure has the defects that supporting rods are transversely connected through a connecting piece with certain rigidity, so that the filtering effect is improved, the filter usually has strong radial supporting force, when the filter is unfolded in a patient body, the adherent area of the filter has strong acting force on the inner wall of the vena cava, the inner wall of the vena cava also necessarily applies a reaction force on the filter, on one hand, the possibility of endothelial climbing is increased due to the overlarge radial supporting force, so that the recovery time window of an instrument is short or the instrument is difficult to recover, and on the other hand, the filter is easy to generate fatigue fracture under the lasting reaction force of a blood vessel.

Disclosure of Invention

The invention aims to solve the technical problem that in the prior art, a rigid connecting rod is adopted to connect supporting rods, so that an instrument has stronger radial supporting force, the inner skin is easy to climb and cover, the recovery time window of the instrument is short or the instrument is difficult to recover, and the fatigue fracture of the instrument is easy to cause.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a filter with flexible connection is composed of a plurality of struts;

a flexible connecting piece is arranged between the supporting rods;

the flexible connecting piece is connected with the supporting rod to form a crossed net structure for filtering.

In the filter with flexible connection, preferably, at least two of the struts are provided with connection points, the flexible connecting piece is connected between the two connection points on different struts, and the length of the flexible connecting piece is not shorter than the linear distance between the two connection points.

In the filter with flexible connection, the connection points of the flexible connecting piece and the support rod are preferably fixedly connected, penetrated or clamped.

In the filter with flexible connection, preferably, the connection point is at least one of a binding point, a welding point, an adhesion point, a connection hole and a connection groove provided on the support rod.

In the filter with flexible connection, the connection points are preferably respectively arranged on each support rod, and the flexible connection piece is arranged at least one circle along the circumferential direction of the filter.

In the filter with flexible connection, the connection points on different struts are preferably arranged in parallel, staggered, spiral or irregular mutual positions in the axial direction, and the flexible connection pieces are continuously arranged between the connection points.

In the filter with flexible connection, the flexible connection member is preferably polygonal, circular or spiral in axial plan view;

or the flexible connecting pieces are connected with all the supporting rods, and the flexible connecting rods are arranged on any three adjacent supporting rods in a V shape or a C shape.

In the filter with flexible connection, at least two connection points are preferably arranged on the same strut, and the flexible connection piece forms at least two layers or two rings.

In the filter with flexible connection, preferably, a plurality of struts extend outwardly from the center, the plurality of struts extend radially outwardly from a central convergence point, and the connection point is disposed at a position where the struts are close to the central convergence point.

In the filter with flexible connection, the flexible connection member is preferably a connecting wire or a connecting wire.

The flexible connecting pieces are arranged among the support rods, have lower rigidity, can be matched with the support rods to form a crossed net structure for filtering, have good filtering effect, do not increase the radial supporting force of the filter, ensure that the adherence area of the filter does not generate strong acting force, reduce the possibility of endothelial climbing, ensure that the recovery time window of the apparatus is long, and ensure that the apparatus is easy to recover, and on the other hand, the filter does not have too strong radial supporting force and is not easy to generate fatigue fracture.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic structural view of a first embodiment of example 1 of the present invention;

FIG. 2 is a perspective view of a first embodiment of example 1 of the present invention;

FIG. 3 is a plan view of a first embodiment of example 1 of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

FIG. 5 is a schematic structural view of a second embodiment of example 1 of the present invention;

FIG. 6 is a perspective view of a second embodiment of example 1 of the present invention;

FIG. 7 is a plan view of a second embodiment of example 1 of the present invention;

fig. 8 is a partial enlarged view at B in fig. 6;

FIG. 9 is a schematic structural view of a third embodiment of example 1 of the present invention;

FIG. 10 is a perspective view of a third embodiment of example 1 of the present invention;

FIG. 11 is a plan view of a third embodiment of example 1 of the present invention;

FIG. 12 is an enlarged partial view of the connection point of the third embodiment of example 1 of the present invention to a flexible connection unit;

FIG. 13 is a schematic structural view of a fourth embodiment of example 1 of the present invention;

FIG. 14 is a perspective view of a fourth embodiment of example 1 of the present invention;

FIG. 15 is a top plan view of a fourth embodiment of example 1 of the present invention;

FIG. 16 is a schematic configuration diagram of a first embodiment of example 2 of the present invention;

FIG. 17 is a perspective view of the first embodiment of example 2 of the present invention;

FIG. 18 is a top plan view of the first embodiment of example 2 of the present invention;

FIG. 19 is a schematic configuration diagram of a second embodiment of example 2 of the present invention;

FIG. 20 is a perspective view of a second embodiment of example 2 of the present invention;

fig. 21 is a plan view of a second embodiment of example 2 of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Orientation definition: the direction of the central axis of the filter is axial, and the direction vertical to the axial direction is radial.

As shown in fig. 1-21, a filter with flexible connections is comprised of a plurality of struts 1000; a flexible connecting piece 2000 is arranged between the supporting rods 1000; the flexible connecting piece 2000 is connected with the supporting rod 1000, and a cross net structure for filtering is formed by matching with the supporting rod 1000, so that the filtering effect is improved, and meanwhile, an overlarge radial supporting force is not generated.

The main structure of the filter is two types: one rod-type structure as shown in fig. 1-15 and one cage-type structure as shown in fig. 16-21, both of which are comprised of a plurality of struts 1000. The rod structure is an open-loop structure, and the support rods 1000 gathered together radially extend outwards from a central gathering point, one part of the support rods 1000 extends forwards to form a filtering part, and the other part of the support rods 1000 is turned backwards to form a supporting part. The filter of the cage-shaped structure is a closed loop structure, the gathered supporting rods 1000 extend outwards and then are gathered together in the center again, namely the two ends of the supporting rods 1000 are respectively gathered together to form two central gathering points, and the middle parts of the supporting rods 1000 extend outwards to form the cage-shaped structure. The structure of the supporting rod is the prior art and is not described in detail herein.

Example 1, as shown in fig. 1-15, a filter with flexible connections is comprised of a plurality of struts 1000; this example is a rod-structured strainer. A flexible connecting piece 2000 is arranged between the supporting rods 1000, and the flexible connecting piece 2000 is used for connecting the supporting rods 1000 and is matched with the supporting rods 1000 to form a network structure. The specific configuration of the flexible linkage 2000 is not limited and may be any shape that forms a network with the strut 1000. The flexible linkage 2000 refers to a linkage made of a material that is itself deformable, without creating too strong a rigid supporting force on the strut 1000 to which it is attached. The flexible connecting member 2000 may be a tube, a rod, a wire, or other materials and structures, preferably a polymer material and a metal wire, such as a PTFE tape, a tape with a PTFE coating, a stainless steel wire, or a nickel titanium wire; preferably, connecting threads or wires are used, for example 0.1mm ptfe wire, 0.08mm PA wire.

The connection between the flexible linkage 2000 and the strut 1000 is made through a connection point 3000. Because the flexible connecting piece 2000 is used for realizing the connection of the filter in the radial direction, the two ends of the flexible connecting piece 2000 must be connected on two supporting rods 1000, that is, at least two supporting rods 1000 are provided with connecting points 3000, the flexible connecting piece 2000 is connected between two connecting points 3000 on different supporting rods 1000, and the flexible connecting piece 2000 is matched with the supporting rods 1000 between the two supporting rods 1000 to form a net structure. The length of the flexible connecting member 2000 is not shorter than the linear distance between the two connection points 3000, and the material characteristics of the flexible connecting member 2000 itself, especially the length of the flexible connecting member 2000 between the connection points is slightly longer than the linear distance between the two connection points 3000, will not generate too strong supporting force to the supporting rod 1000 in the radial direction, so that the radial rigidity of the whole filter is reduced. Connection point 3000 refers to the location of connection and the fixed location between flexible connector 2000 and strut 1000. The two struts 1000 used for connecting the flexible connecting members 2000 may be adjacent struts 1000, or may be non-adjacent struts 1000, and the flexible connecting members 2000 are used to form a network structure, reduce the gaps between the struts 1000, and enhance the filtering effect, so that the flexible connecting members 2000 are used to connect the struts 1000 in the radial direction, and the connection may be continuous or discontinuous. The continuous flexible connecting piece 2000 is continuously connected with a plurality of supporting rods 1000 to form a network structure, and the discontinuous flexible connecting pieces 2000 are provided in plurality and are respectively and independently connected with the two supporting rods 1000. Preferably, the flexible connecting member 2000 is disposed along the entire circumference of the filter, and preferably, the connection points 3000 are disposed on each of the struts 1000, respectively, and the flexible connecting member 2000 is disposed along the circumference of the filter by at least one turn, which means a radial circumference of the filter.

The flexible connecting piece 2000 is fixedly connected with the connecting point 3000, and is in penetrating installation or clamping connection. The flexible connecting member 2000 is connected to the supporting rod 1000 at the connecting point 3000 by various connecting methods, one is a fixed connection, and the other is a non-fixed connection. The fixed connection can adopt the modes of bundling, welding, bonding and the like, and the non-fixed connection adopts the modes of penetrating, clamping and the like. The fixed connection mode can make the connection of the flexible connector 2000 stable and balanced, and the non-fixed mode makes the flexible connector 2000 become a whole, and the fixed connection and the non-fixed connection are commonly matched for use. The connection point 3000 is preferably at least one of a binding point, a welding point, an adhesion point, a connection hole, and a connection groove provided on the supporting rod 1000, corresponding to the fixed connection and the non-fixed connection. The corresponding fixed connection is generally selected individually, and one or more than two fixing modes can be selected for the non-fixed connection, for example: the flexible connecting piece is arranged in the connecting hole in a penetrating way and fixed through bundling, and is clamped in the connecting groove and fixed through bonding. In the embodiment, the flexible connection member 2000 is fixed to the supporting rod 1000 by means of a through-fit method, that is, a connection hole is formed in the supporting rod 1000, the flexible connection member 2000 penetrates through the connection hole and is fixed to the supporting rod 1000 in a limiting manner, and two ends of the flexible connection member 2000 are fixed by means of welding, bundling and bonding.

The arrangement of connection points 3000 is of various forms: one is that the number of the connection points 3000 on the supporting rod 1000 is set, that is, 0-n connection points 3000 are set corresponding to each supporting rod 1000, and n is more than or equal to 1. Instead of a strut 1000 having attachment points 3000, the flexible linkage 2000 may encircle the strut 1000, or there may be no flexible linkage 2000 radially passing through the strut 1000.

When more than one connection point 3000 is provided on one strut 1000, the connection points 3000 may be concentrated at one or more positions of the strut 1000, or may be distributed. Preferably centered at a point where the struts 1000 converge near the center of the filter, which is near the center of the filter's central axis, i.e., the center where the ends of the struts 1000 converge. Preferably, at least two attachment points 3000 are provided on the same bar 1000, and the flexible linkage 2000 forms at least a two-ply or two-turn structure. Two layers means that the two-layer structure is seen in the axial direction, and the two-layer structure can be continuous or discontinuous. Two loops means that two loop structures are formed around the circumference of the filter.

Another form of arrangement of the connection points 3000 refers to: depending on the position of the strut 1000 in the axial direction. The mutual positional relationship of the connection points 3000 of the different struts 1000 in the axial direction may form a parallel, staggered, spiral or irregular shape, and the flexible connectors 2000 are continuously disposed between the connection points 3000.

Corresponding to the different connection points 3000 arrangement forms, the flexible connector 2000 can be arranged on the supporting rod 1000 in various structures:

the position where the flexible coupling 2000 is disposed: preferably, a plurality of struts 1000 extend radially outward from a central collection point, and the connection points 3000 are disposed at the struts 1000 near the central collection point of the filter, looking axially down at the filter, with the flexible connectors 2000 forming a network structure at the center of the filter. The central position is positioned in the middle of the blood vessel, so that thrombus is easy to intercept.

Preferably, the flexible connecting member 2000 forms a polygonal shape, a circular shape or a spiral shape in an axial plan view; or the flexible connecting piece 2000 is connected with all the supporting rods 1000, and on any three adjacent supporting rods 1000, the flexible connecting rods are arranged on the supporting rods 1000 in a V shape or a C shape.

As shown in fig. 1-4, which is a first embodiment of a rod-type structured filter, the filter includes a support portion and a filter portion, and the rod 1000 includes a rod 1100 of the support portion and a rod 1200 of the filter portion. The struts 1100 constituting the strut part and the struts 1200 constituting the filtering part both extend from the central convergence point, and the struts 1100 constituting the strut part extend to the outside in the forward direction and turn over in the reverse direction step by step to form a point supported on the inner wall of the blood vessel. The struts 1200 of the filter portion are extended outward in a forward direction, and the struts 1100 of the support portion and the struts 1200 of the filter portion are cross-linked around a convergence point at the center of the filter to form a cross-linked structure. One connecting point 3000 is provided for each strut 1000, as shown in fig. 1 and 2, the connecting point 3000 of the strut 1100 of the support part is provided below the bifurcation of the strut 1100, i.e., below the cross-linking point of the cross-linked structure of the strut 1100, the connecting point 3000 of the strut 1200 of the filter part is provided below the connecting point 3000 of the strut 1100 of the support part, and the connecting points 3000 of the adjacent three struts 1000 form a V shape. The flexible connecting member 2000 is threaded through each connecting point 3000 to form a continuous W-shaped flexible connecting member 2000, and the cross-linked structure of the flexible connecting member 2000 and the supporting rod 1000 forms a net structure. As shown in fig. 4, a flexible connector 2000 is threaded into the connection point 3000.

As shown in fig. 5-8, a second embodiment of the rod-type filter structure is provided, the filter includes a support portion and a filter portion, and the structure of the rod 1000 is the same as that of the first embodiment, and will not be described again. As shown in fig. 5 and 6, the connection point 3000 of the strut 1100 of the support part is provided at the middle of the strut 1100, and the filter part is not provided with a connection point. As shown in fig. 7 and 8, the flexible connecting member 2000 is threaded through the connecting point 3000 of each strut 1100 to form a circular flexible connecting member 2000, and the flexible connecting member 2000 and the cross-linked structure of the struts 1100 form a net structure.

Referring to fig. 9-12, a third embodiment of a rod-type filter is shown, which includes a support portion and a filter portion, and the structure of the rod 1000 is the same as that of the first embodiment, and will not be described again. As shown in fig. 9 and 10, the connection point 3000 of the strut 1100 of the support part is disposed at the middle of the strut 1100, and the connection point 3000 of the cross-linked structure of the strut 1200 of the filter part is disposed. The flexible connecting members 2000 are two, one is only threaded through all the connecting points 3000 of the strut 1100 of the supporting part to form a circle of approximately circular flexible connecting members 2000, and the other is, as shown in fig. 12, threaded through each connecting point 3000 of the strut 1200 of the filtering part and each connecting point 3000 of the strut 1100 of the supporting part to form a circle of V-shaped flexible connecting members 2000, as shown in fig. 11, two flexible connecting members 2000 have substantially the same diameter in axial plan view to form a two-layer structure.

Referring to fig. 13-15, a fourth embodiment of a rod-type structured filter is shown, wherein the filter includes a support portion and a filter portion, and the structure of the rod 1000 is the same as that of the first embodiment, and will not be described again. As shown in fig. 13 and 14, the connection point 3000 of the support portion is disposed at the middle of the strut 1100, and the connection point 3000 of the filter portion is disposed on the strut 1200 to form a spiral line. The number of the flexible coupling members 2000 is two, and one is threaded through each of the connection points 3000 of the support portion strut 1100 to form a circle of approximately circular flexible coupling members 2000, and the other is threaded through each of the connection points 3000 of the filter portion strut 1200 to form a spiral flexible coupling member 2000, as shown in fig. 15.

Example 2, as shown in fig. 16-21, a filter with flexible connections, consisting of a plurality of struts 1000; this example is a filter of cage structure. The filter of cage structure forms closed loop structure for the radioactive arrangement of branch 1000.

As shown in fig. 16-18, a first embodiment of a cage filter is shown. The cage filter comprises a plurality of supporting rods 1000 which are arranged in an axisymmetric manner, the end parts of each supporting rod 1000 are converged to form a top center converging part 1001 and a bottom center converging part 1002, and the middle parts of the supporting rods 1000 are outwards expanded to form a cage structure.

Two connection points 3000 are arranged at intervals at the position of each supporting rod 1000 close to the top center gathering part 1001, and the connection points 3000 in all the supporting rods 1000 are arranged in two layers when the filter is viewed in an axial overlook mode, namely, the connection points 3000 on each layer at the same height in the axial direction form a layer structure. Each layer of connection points 3000 is connected to a flexible connector 2000, thus forming two loops of flexible connectors 2000, each layer of flexible connectors 2000 forming an approximate circle.

A second embodiment of a cage filter is shown in fig. 19-21. The cage filter body structure is the same as the above embodiments and will not be described in detail.

Similarly, two connection points 3000 are arranged at intervals at the top center gathering part 1001 close to each strut 1000, and the connection points 3000 of all the struts 1000 are arranged in two layers when the filter is viewed in an axial direction, namely, the connection points 3000 of each layer at the same height in the axial direction form a layer structure. The difference is that the flexible connecting members 2000 are connected with the two layers of connecting points 3000 in a staggered manner, and the flexible connecting members 2000 of the adjacent three supporting rods 1000 form two V-shaped or C-shaped structures with opposite openings. As seen in the top view of fig. 21: the staggered connection forms an angular structure.

Claims

1. A filter with flexible connection, which is composed of a plurality of struts and is characterized in that:

a flexible connecting piece is arranged between the supporting rods;

the filter comprises a supporting part and a filtering part, the supporting rods forming the supporting part and the supporting rods forming the filtering part extend from the same side of the central convergence point of the filter, the supporting rods forming the supporting part extend towards the positive outer side and turn over reversely step by step to form points supported on the inner wall of the blood vessel;

the flexible connecting pieces are connected with the supporting rods of the supporting part and the supporting rods of the filtering part, and the flexible connecting pieces are matched with the supporting rods of the supporting part and the supporting rods of the filtering part to form a crossed net structure for filtering, wherein the crossed net structure is a three-dimensional net structure in a unfolded state of the filter, a first end of the three-dimensional net structure is relatively close to a central convergence point of the filter in the axial direction, and a second end of the three-dimensional net structure is relatively far away from the central convergence point of the filter in the axial direction; the flexible connecting pieces are only arranged in the circumferential direction of the whole filter;

the flexible connecting piece is arranged at least one circle along the circumferential direction of the filter; the mutual position relation of the connection points of the different support rods and the flexible connecting pieces which are arranged in the axial direction is parallel, staggered, spiral or irregular, and the flexible connecting pieces are continuously arranged among the connection points;

the flexible connecting piece is connected between two connecting points on different supporting rods, and the length of the flexible connecting piece is slightly longer than the linear distance between the two connecting points.

2. The filter with flexible connection of claim 1, wherein the flexible connection member is fixedly connected, threaded or clamped with the connection point of the support rod.

3. The filter with flexible connection of claim 1, wherein said connection points are at least one of strapping points, welds, adhesive points, attachment holes, attachment slots provided on said struts.

4. The filter with flexible connection of claim 1, wherein the flexible connection is polygonal, circular or spiral in axial plan view;

or the flexible connecting pieces are connected with all the supporting rods, and the flexible connecting pieces are arranged on any three adjacent supporting rods in a V shape or a C shape.

5. A filter with flexible connections according to claim 1, characterised in that at least two of said connection points are provided on the same strut, said flexible connections forming at least a two-layer or two-turn structure.

6. The filter with flexible connection of claim 1, wherein a plurality of said struts extend radially outward from a central convergence point of said filter, said connection points being disposed at locations of said struts proximate said central convergence point.

7. A filter with flexible connections according to any of claims 1-6, characterised in that the flexible connections are connection wires or connection filaments.