WO2019000513A1

WO2019000513A1 - Semi-closed double-supporting recyclable type vena cava filter

Info

Publication number: WO2019000513A1
Application number: PCT/CN2017/093628
Authority: WO
Inventors: 李虎; 黄兴龙; 顾好栋; 李扬波
Original assignee: 上海宏普医疗器械有限公司
Priority date: 2017-06-28
Filing date: 2017-07-20
Publication date: 2019-01-03
Also published as: CN107280807A

Abstract

A semi-closed double-supporting recyclable type vena cava filter, comprising a recycling hook (9), a front supporting structure, a middle structure, and a rear supporting structure which are sequentially provided from front to back; the front supporting structure comprises at least three supporting arms (7) with each provided with an elastic bending part (7) with a backward end, and the supporting arms (7) are provided in radial divergency; the supporting arms (7) are identical or close to be identical with supporting legs (2) in external diameter, the external diameter being greater than that of the middle structure; the supporting arms (7) and the middle structure are independent from each other and are separately connected to the recycling hook (9). After expansion of a product, the semi-closed double-supporting structure is formed at two ends of the product to enable the product to be stable and not tilt easily, and the product is easily withdrawn when wrapped with endangium; the recycling hook (9) is less prone to adherence and is easily grabbed; the crotch of the net structure of the product has certain distance from the vessel wall and less prone to being wrapped by hyperplastic tissue of the endangium, and the product can be easily withdrawn when wrapped by the endangium by the aid of the semi-closed supporting structure.

Description

Semi-closed double-supporting retrievable vena cava filter

Technical field

The invention relates to a thrombus filtering device for filtering free thrombus in the inferior vena cava blood vessel, preventing pulmonary embolism and pulmonary infarction, in particular to a semi-closed double-support retrievable vena cava filter, belonging to the inferior vena cava system medical treatment. The field of device technology.

Background technique

At present, the lantern-like retrievable vena cava filter or the basket-like retrievable vena cava filter appeared on the market. After implantation in the human body, the implantation hook is easy to be covered by the intimal hyperplasia tissue, and the product is recovered when the product is recovered. It is difficult for the trap to catch the recycling hook, resulting in product recovery failure. For safety reasons, product implantation time is shorter. Furthermore, after the product is implanted into the human body, the bifurcation of the product basket net structure is easily covered by the intimal hyperplasia tissue, which causes difficulty in product recovery, and there is a risk of tearing the blood vessel during recovery, in order to reduce the risk and the product implantation period. It is very short.

Summary of the invention

The object of the present invention is to allow the vena cava filter to be implanted in the patient for a longer period of time, to operate more smoothly during the recovery procedure, and to improve the safety of the vena cava filter recovery.

The invention adopts the following technical solutions:

A semi-closed double-supporting retrievable vena cava filter comprises a recovery hook 9 arranged in the front-to-back direction, a front side support structure, an intermediate structure, and a rear side support structure; the front side support structure includes an end portion having a rearward elasticity a support arm 7 of the bent portion, at least three support arms are radially dispersed; the rear side support structure includes a support leg 2 having a rearward elastic bend at the end, and at least three support legs are radially divergently disposed; The support arm 7 is the same as or nearly the same as the outer diameter of the support leg 2, and is larger than The outer diameter of the intermediate structure; the support arm 7 and the intermediate structure are each independent, and each is connected to the recovery hook 9.

Further, the recovery hook 9 is a hollow tubular shape, and a concave hook is cut at the end end, and a connection release nut 8 is welded in the hollow tubular shape.

Further, the concave hook is formed by laser cutting to form a slit structure parallel to the longitudinal axis of the product, which is convenient for the catching ring to be grasped, and is not easy to fall off when the product is recovered.

Further, the front side of the intermediate structure has at least three screen spreaders 6 disposed radially in a dispersive manner; the rear side of the intermediate structure has a radial divergence setting with a portion of the rear side support structure connected by the connecting pipe 3 The central filter 4 is connected between the central filter 4 and the filter spreader 6 via a filter connecting rod 5.

Further, the filter spreader 6 has six, the filter spreader 6 has a width of 0.2 mm to 0.9 mm, and the six filter spreaders 6 are arranged around the recovery hook 9 at 360°. The angle between the rods is 60°, and the angle between the screen opening rod 6 and the long axis of the recovery hook 9 is in the range of 45° to 135°.

Further, the support arm 7 is located radially between the two filter struts 6 , and the angle between the support arm 7 and the two adjacent filter struts 6 is 0° to 60°; the support arm 7 and the recovery hook are 9 forms an angle of 45 ° ~ 135 °.

Further, the elastic bending portion 7a of the support arm has a length of 0.5 mm to 50 mm, and an outer diameter formed at the tip end of the six support arms 7 after the product is expanded is 5 mm to 50 mm.

Further, the support arm is divided into two groups which are arranged between the two groups. The radii of the two sets of support arms are different, and the two sets of support arms are arranged in a concentric double ring; the angles between adjacent support arms are equal.

Further, the filter connecting rods 5 are 5 mm to 50 mm long, and the total number is 6. Each filter connecting rod 5 is connected to a filtering grid of the central filter 4, and the 6 filter connecting rods 5 are arranged equidistantly.

Further, the total number of the filtering grids is six, and the six filtering grids are coextensively arranged and arranged in a 360 degree network. After the product is expanded, the maximum width of each filtering grid is 2 to 8 mm, and the filtering grid is further One The ends converge on the connecting pipe 3.

Further, the filter spreader 6, the filter connecting rod 5, and the middle filter 4 form a closed basket net structure, and the diameter of the closed mesh structure after the product is expanded is 10 mm to 30 mm, and the support arm 7 end The maximum distance between the portion and the filter connecting rod 5 is 15mm-50mm.

Further, the number of the supporting legs 2 is six, and the supporting legs 2 are equidistantly arranged at one end of the connecting tube 3, and the length of the supporting legs is 5 mm to 50 mm.

Further, the support leg 2 is divided into two groups which are arranged at intervals, and the radii of the two sets of support legs 2 are different, and the two sets of support legs are arranged in a concentric double layer; the farthest gap between the two layers is 0.5 mm to 30 mm; adjacent The angle between the support legs is equal.

Further, the elastic bending portion of part or all of the supporting legs has a fixed barb 1 , and the product is fixed and the inverted sill 1 is at an angle of 15 to 90 degrees with the longitudinal axis of the product. When the product is contracted, the fixed squat 1 automatically shrinks and is fixed. The spacing between 剌1 and connecting pipe 3 is 3-20mm,

Further, each support leg is provided with a fixed barb 1 .

Further, the fixed barb direction is perpendicular to the elastic bending portion of the support leg, and is fixed after being twisted.

Further, the recovery hook 9 is connected to one end of the three filter propping rods 6, and the three filter propping rods 6 are arranged at an angle of 120°, and the other end of the filter propping rod 6 is divided into two, bifurcation They are then connected to a screen connecting rod 5 respectively.

Further, the support leg 2 is curved outwardly in a concave shape along the longitudinal axis of the product, and the fixed barb 1 is at the end of the support leg.

The beneficial effects of the invention are:

1) After the product is expanded, the semi-closed double-supported structure at both ends of the product can make the product more stable and not easy to tilt, and it is easier to withdraw when the inner film is coated;

2) Recycling hooks are not easy to be attached and can be easily grasped, which can greatly reduce the risk of blood vessel tearing and prolong the product. Implantation period

3) The filter structure formed by the central filter 4 of the product, the support arm 7 and the filter opening rod 6 can better filter the thrombus and improve the filtration efficiency. The filter is provided at both ends of the product, and the implantation operation can be performed. Implantation from the femoral vein can also be implanted from the jugular vein, giving doctors and patients a more choice.

4) Both ends of the product contain a semi-closed support structure, the middle structure is a thrombus filtration structure, the product has good stability in the blood vessel, and the bifurcation of the product basket net structure has a certain distance from the blood vessel wall, and is not easily penetrated by the endothelium. The hyperplastic tissue is coated, and the semi-closed support structure allows the product to be easily withdrawn when covered by the endothelium, thereby reducing the risk of tearing of the blood vessel and increasing the time limit for product implantation in the patient.

5) The support leg and the support arm are respectively divided into two groups which are arranged between the two groups. The radii of the two groups are different. The two sets of support legs and the support arms are arranged in a concentric double layer, and the support arms and support legs with larger radius are in contact with the blood vessel wall. Fixed, when the inner diameter of the blood vessel is small, the support arm and the support leg with smaller radius will also be fixed in contact with the blood vessel wall, so that the adaptability of the product is stronger.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a front elevational view of a first embodiment of the present invention.

Figure 2 is a right side view of Figure 1.

Figure 3 is a front elevational view of a second embodiment of the present invention.

Figure 4 is a front elevational view of a third embodiment of the present invention.

Fig. 5 is a schematic view showing the structure of a blood vessel in the first embodiment of the present invention.

Figure 6 is a front elevational view of the fourth embodiment.

[Correct according to Rule 91 11.08.2017]
Fig. 7 is a front view of the fifth embodiment.

In the figure, 1. fixed barb, 2. support leg, 3. connecting pipe, 4. middle filter, 5. filter connecting rod, 6. strainer open rod, 7. support arm, 8. connection release nut , 9. Fixed hooks.

Detailed ways

The invention is further described below in conjunction with the drawings and specific embodiments.

Embodiment 1:

Referring to Figures 1, 2, and 5, the product consists of a fixed barb 1, a support leg 2, a connecting pipe 3, a middle filter 4, a filter connecting rod 5, a strainer opening rod 6, a support arm 7, a connection release nut 8, and Recycling hook 9 is composed.

The recovery hook 9 is a hollow tubular shape, and a concave hook is cut at the end end, and a connection release nut 8 is welded in the hollow tubular shape. The concave hook is formed by laser cutting to form a slit structure parallel to the longitudinal axis of the product, which is convenient for the catching ring to be grasped, and is not easy to fall off when the product is recovered.

The semi-closed double-supported retrievable vena cava filter comprises 6 filter struts 6 , the filter struts 6 Width 0.2mm to 0.9 mm, 6 filter struts around the recovery hook 9 to 360 degrees Arranged, the rod and the rod are at an angle of 60°, and the angle between the screen opening rod 6 and the long axis of the recovery hook 9 is 45° to 135°.

The support arm 7 of the present invention is located between the two filter struts 6 , and the angle between the support arm 7 and the two adjacent filter struts 6 is between 0° and 60°, with an angle of 30° being preferred. The angle formed by the plane formed by the six support arms 7 and the hook connecting section and the long axis of the recovery hook 9 is between 45 and 135. The other end of the support arm 7 includes a fold line segment, the length of the fold line segment is 0.5 mm to 50 mm, and the outer diameter formed at the tip end of the 6 support arms 7 after the product is expanded is 5 mm to 50 mm. The six support arms 7 can be arranged in equal radii, or three support arms 7 can be arranged in a radius, the other three support arms 7 are arranged in a radius, and the six support arms 7 are arranged in a concentric double ring.

The semi-closed double-supported retrievable vena cava filter strainer connecting rod 5 is 5 mm to 50 mm long, and the total number is 6. Each filter connecting rod is connected with a filtering grid, and the 6 filter connecting rods are arranged equidistantly.

The semi-closed double-supported retrievable vena cava filter has a total of 6 filter meshes, and 6 filter meshes are arranged side by side in a 360-degree mesh. The maximum width of each filter mesh after product expansion is 2-8 mm. The other end of the filter grid converges on the connection pipe.

The filter opening rod 6, the filter connecting rod 5, and the middle filter 4 form a closed basket net structure, and the diameter of the closed basket net structure after the product is expanded is 10 mm to 30 mm, and the support arm 7 and the filter connecting rod The maximum spacing between 5 is between 15mm and 50mm.

The number of support legs 2 of the semi-closed double-supported resuscitable vena cava filter is 3 to 12, with 6 being preferred, and the support legs 2 are equidistantly arranged at one end of the connecting tube 3, and the length of the supporting leg 2 is 5 mm to 50 mm. When the number of support legs is six, it can be arranged in six equal radii, or three equal radii, and the other three are arranged in a concentric double-layer structure with another radius and the like, and arranged in a concentric double-layer structure, two layers. The farthest gap between them is 0.5mm to 30mm.

The support leg 2 comprises a fold line segment at the head end, and a fixed barb 1 at the break point. After the product is expanded, the fixed buck 1 is at an angle of 15 to 90 degrees with the longitudinal axis of the product. When the product is contracted, the fixed buck is automatically contracted and fixed. The distance between the inverted raft 1 and the connecting pipe 3 is 3-20 mm, and each supporting leg 1 includes a fixed barb 1 or a barb is provided for each supporting leg 2 at intervals.

Embodiment 2:

Referring to FIG. 3, in the embodiment, the semi-closed double-supporting retrievable vena cava filter has a fixed barb 1 direction perpendicular to the elastic bending portion 2a, and is fixed after being twisted, and the fixing effect of the structure is stronger, and the other is The structure is identical to that of the first embodiment.

Embodiment 3:

Referring to FIG. 4, in the embodiment, the recovery hook 9 is followed by three filter opening rods 6, and the three filter opening rods 6 are arranged at an angle of 120°, and the other side of the filter opening rod 6 is divided. Second, after splitting, they are respectively connected to a filter connecting rod 5.

After the recovery hook 9 , there are a support arm 7 between the two filter support rods 6 and two, and the angle between the support arm 7 and the adjacent two filter support rods is 0° to 60°, at an angle of 30°. For the sake of priority, other structures are consistent with the first embodiment.

Embodiment 4:

As shown in Fig. 6, the support leg 2 is curved outwardly in a concave shape along the longitudinal axis of the product, and the fixed barb 1 is supported at the end of the leg, and the product is inserted into the blood vessel wall to fix the product. The other structure is the same as that of the third embodiment.

Embodiment 5:

As shown in Fig. 7, the elastic bent portion 2a of the support leg 2 has an arc shape, and the fixed barb 1 is also curved, one bent forward and one bent backward. The bent portion 2a may be integrally bent or may be bent at a part of the tip end.

The above several embodiments are all preferred embodiments of the present invention, and those skilled in the art can also make various changes or improvements on the basis of the present invention, and these transformations or improvements should be made without departing from the general idea of the present invention. It is within the scope of the claimed invention.

Claims

A semi-closed double-support retrievable vena cava filter characterized by:

The utility model comprises a recycling hook (9) arranged in order from the front to the back, a front side support structure, an intermediate structure and a rear side support structure;

The front side support structure includes a support arm (7) having a rearward elastic bend at the end, and at least three support arms are radially dispersed;

The rear side support structure includes a support leg (2) having an elastic fold portion at a rear end, and at least three support legs are radially dispersed;

The support arm (7) is identical or nearly identical to the outer diameter of the support leg (2) and larger than the outer diameter of the intermediate structure;

The support arms (7) are independent of the intermediate structure and are each connected to a recovery hook (9).
The semi-closed double-supported retrievable vena cava filter according to claim 1, wherein the elastic bending portion (7a) of the support arm has a length of 0.5 mm to 50 mm, and the tips of the six support arms (7) are expanded after the product is expanded. The outer diameter formed at the place is 5 mm to 50 mm.
The semi-closed double-support retrievable vena cava filter according to claim 2, wherein the filter spreader (6), the filter connecting rod (5) and the middle filter (4) form a closed basket. The mesh structure, the diameter of the basket-like structure closed after the product is expanded is 10 mm to 30 mm, and the maximum distance between the end of the support arm (7) and the filter connecting rod (5) is 15 mm to 50 mm.
The semi-closed double-supported retrievable vena cava filter according to claim 1, wherein the front side of the intermediate structure has at least three sieve spreaders (6) arranged in a radial divergence; a rear side, a portion connected to the rear side support structure through the connecting pipe (3), having a radially diffused central filter (4), between the middle filter (4) and the filter spreader (6) Connected via the filter connecting rod (5).
The semi-closed double-support retrievable vena cava filter according to claim 4, wherein: The support arm (7) is located radially between the two filter struts (6), and the angle between the support arm (7) and the two adjacent filter struts (6) is 0° to 60°; the support arm (7) The angle formed by the recovery hook (9) is 45° to 135°.
The semi-closed double-supported retrievable vena cava filter according to claim 4, wherein the support arm is divided into two groups which are arranged between the two groups, and the two sets of support arms have different radii, and the two sets of support arms are arranged in a concentric double ring; The angle between adjacent support arms is equal.
The semi-closed double-support retrievable vena cava filter according to claim 4, wherein the supporting leg (2) is divided into two groups which are arranged between the two groups, and the two groups of supporting legs (2) have different radii, and the two groups of supporting legs It is arranged in a concentric double layer; the farthest gap between the two layers is 0.5 mm to 30 mm; the angle between adjacent support legs is equal.
The semi-closed double-supported retrievable vena cava filter according to claim 1, wherein the elastic bending portion of the part or all of the supporting legs has a fixed barb (1), and the product is expanded and fixed to collapse (1) with The longitudinal axis of the product is at an angle of 15 to 90 degrees. When the product shrinks, the fixed inverted raft (1) automatically shrinks, and the distance between the fixed inverted raft (1) and the connecting pipe (3) is 3-20 mm.
The semi-closed double-support retrievable vena cava filter according to claim 8, wherein the fixed barb direction is perpendicular to the elastic bending portion of the support leg, and is fixed by twisting.
The semi-closed double-supported retrievable vena cava filter according to claim 1, wherein the supporting leg (2) is curved outwardly in a concave shape along the longitudinal axis of the product, and the fixed barb (1) is supported at the leg end. .