CN213217905U

CN213217905U - Vena cava filter system

Info

Publication number: CN213217905U
Application number: CN202021256555.XU
Authority: CN
Inventors: 刘建龙; 胡清; 张灯风; 谭茂彩; 潘幸珍; 刘继勇
Original assignee: Kossel Medtech Suzhou Co ltd
Current assignee: Kossel Medtech Suzhou Co ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-05-18
Anticipated expiration: 2030-07-01

Abstract

The utility model discloses a vena cava filter system, which comprises a filter, wherein the filter is provided with a tubular filter head end, a thread guide cavity and a recovery hook which are communicated are formed at the filter head end, a plurality of pairs of filter screens which are uniformly distributed extend from the tail end of the filter head end, a support leg extends outwards from the tail end of each filter screen, a fixed rivet is arranged at the tail end of each support leg, and a balance arm extends between every two adjacent filter screens; wherein, two opposite support legs have the same length, and two adjacent support legs have different lengths. The utility model discloses a vena cava filter system, the not slope of reaching the long term when having guaranteed the filter release for the filter has long recovery period.

Description

Vena cava filter system

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to vena cava filter system.

Background

Pulmonary artery embolism (pulmonary embolism) is a series of clinical pathophysiological changes mainly caused by pulmonary circulation dysfunction, and sudden death is caused seriously because peripheral deep vein thrombosis or thrombosis in the right heart cavity falls off to enter pulmonary circulation to block the pulmonary artery or branches of the pulmonary artery. Research shows that embolus causing PE is mainly derived from thrombus falling off from deep limb veins or pelvic veins and accounts for 60-90% of the source of the embolus. Therefore, a filtering device can be placed below the renal vein opening level to intercept free emboli in blood, so that pulmonary embolism can be effectively prevented.

The filter can be classified into: permanent filters and recyclable filters. The permanent filter can be placed permanently and can not be taken out; however, the filter of the type can have corresponding complications such as displacement, perforation of vena cava, local thrombosis, obstruction of inferior vena cava and the like after being placed for a long time; meanwhile, patients need to take anticoagulant drugs for a long time, which brings great limitation to practical application. The recyclable filter can be removed from the body within a certain period of time (2 weeks to 3 months), thereby avoiding the disadvantage of permanently implanting the filter.

At present, more than ten kinds of filter products are widely used in clinic at home and abroad. However, the filter is often found to be inclined during implantation and before removal in clinic, and the filter cannot be removed after the filter is inclined and the recovery hook is attached to the wall. Therefore, how to provide a vena cava filter system to reduce the inclination of the filter after implantation is a technical problem that needs to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a novel vena cava filter system, reached the not slope of long term when having guaranteed the filter release for the filter has long recovery period.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model provides a vena cava filter system, which comprises a filter, wherein the filter is provided with a tubular filter head end, a thread guide cavity and a recovery hook which are communicated are formed at the filter head end, a plurality of pairs of filter screens which are uniformly distributed extend from the tail end of the filter head end, a support leg extends outwards from the tail end of each filter screen, a fixed rivet is arranged at the tail end of each support leg, and a balance arm extends between every two adjacent filter screens; wherein, two opposite support legs have the same length, and two adjacent support legs have different lengths.

Furthermore, the length difference value of two adjacent supporting legs is 2-5 mm.

Furthermore, the balance arm is in a Y shape as a whole and comprises a main arm and a pair of support arms extending from the tail end of the main arm, and each support arm is in an S shape.

Further, the fixed rivet is of a torsion type structure, and the torsion angle is 90 degrees.

Further, the material of filter is nickel titanium alloy tubular product, and the filter main part adopts laser cutting, retrieves the hook and is formed by 360 degrees laser spiral type cutting.

Further, the filter screen, the supporting leg and the number of balance arm are 2 pairs, and all evenly distributed along the axis of filter head end.

Further, the device also comprises a delivery system, wherein the delivery system consists of a delivery sheath, an introducer and a push rod.

Furthermore, the push rod consists of a push rod handle, a hard guide wire and a soft guide wire, the hard guide wire is fixed at the front end of the push rod handle, and the soft guide wire is fixed at the front end of the hard guide wire; the outer diameter of the soft guide wire is smaller than the inner diameter of the guide wire cavity, and the outer diameter of the hard guide wire is larger than the inner diameter of the guide wire cavity.

Furthermore, the soft guide wire and the hard guide wire are both made of stainless steel.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the vena cava filter system of the utility model adopts the supporting legs with different lengths, so that the supporting leg level is unfolded in the releasing process of the filter, and the stability of the filter when being planted is improved; and multi-layer point fixation is realized, and the long-term stability is improved.

2. The utility model discloses a vena cava filter system adopts the balance arm structural design from the heart, guarantees the balanced effect of filter in the blood vessel, prevents the filter slope, has guaranteed the long recovery period of filter.

3. The vena cava filter system of the utility model is provided with the fixing rivet at the tail end of the supporting leg, thereby the supporting leg and the blood vessel are in a safe point contact design, and the displacement of the filter is effectively inhibited; the fixed riveting is the design of torsion type simultaneously, can control barb depth of insertion, reduces the damage to the vascular wall, prevents to pierce through simultaneously.

4. The utility model discloses a vena cava filter system, the soft seal wire of push rod front end is used with the cooperation in filter seal wire chamber, pinpoints when having guaranteed the filter release, does not incline, has improved the recovery success rate of filter.

5. The vena cava filter system of the utility model adopts a 360-degree integrated laser cutting design for the recovery hook, has higher strength than a welding type recovery hook, and avoids deformation and fracture in the recovery process; the special structure and the smooth neck design are convenient for the locking of the 'snare recovery'.

Drawings

FIG. 1 is a schematic diagram of the filter structure of the present invention;

FIG. 2 is a top view of the filter construction of the present invention;

fig. 3 is a schematic view of the structure of the push rod of the present invention;

fig. 4 is a schematic diagram of the filter balance arm release state of the present invention.

Figure 5 is a schematic view of the filter short support leg release state of the present invention.

FIG. 6 is a schematic view of the filter long support leg in a released state;

the reference numbers in the figures illustrate: 1. a filter; 11. a recovery hook; 12. a filter screen; 13. a balance arm; 14. supporting legs; 15. fixing and riveting; 16. a guidewire lumen; 131. a main arm; 132. a support arm; 141. short support legs; 142. a long support leg; 2. a push rod; 21. a soft guide wire; 22. a hard guidewire; 23. a steel pipe; 241. a first marker band; 242. a second marker band; 25. a push rod handle; 3. a delivery sheath; 4. the vena cava vessel wall.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a vena cava filter system, including filter 1 and conveying system. The filter 1 has a tubular filter head end, a guide wire cavity 16 and a recovery hook 11 are formed in the filter head end, and the recovery hook 11 is internally provided with a hollow tube cavity. The end of filter head end extends along circumference a plurality of pairs of evenly distributed's filter screen 12, extends a balance arm 13 between adjacent filter screen 12, and the end of filter screen 12 extends supporting leg 14, and the tip of supporting leg 14 is equipped with fixed riveting 15.

The filter 1 is integrally formed by laser cutting, and the recovery hook 11 is formed by cutting a 360-degree laser spiral type. Referring to fig. 1 and 2, in the present embodiment, the number of the filter screens 12 is 4, the fixing rivet 15 is a torsion structure, and the torsion angle is preferably 90 °.

The filter 1 has 4 support legs 14, comprising 2 short support legs 141 and 2 long support legs 142, and the support legs 14 are evenly distributed along the axis of the filter 1. Preferably, the long support leg 142 is 2-5 mm longer than the short support leg 141.

The filter 1 has 2 pairs of balance arms 13, and the 2 pairs of balance arms 13 have a self-centering structure. The balance arm 13 is generally "Y" shaped, and is composed of a main arm 131 and a pair of arms 132 extending from the end of the main arm 131, and the arms 132 are "S" shaped.

The delivery system comprises a delivery sheath 3, a pusher rod 2 and an introducer (not shown). As can be seen from fig. 3, the push rod 2 is composed of a soft guide wire 21, a hard guide wire 22 and a push rod handle 25, the hard guide wire 22 is fixed on the push rod handle 25, the soft guide wire 21 and the hard guide wire 22 are connected through a steel tube 23, and the hard guide wire 22 is provided with a first mark belt 241 and a second mark belt 242. The soft guidewire 21 has an outer diameter that is smaller than the inner diameter of the guidewire lumen 16 so that it can be inserted into the guidewire lumen 16. The outer diameters of the steel tube 23 and the stiff guidewire 22 are larger than the inner diameter of the guidewire lumen 16.

Fig. 4 to 6 show the release process of the filter 1. Firstly, a filter 1 and a delivery sheath 3 are delivered to a target position of a blood vessel through a push rod 2; then slowly withdrawing the delivery sheath 3, and firstly releasing the balance arm 13 to contact with the vena cava blood vessel wall 4; 2, the balance arms 13 which are self-centering are uniformly distributed, so that the stability of the filter 1 during long-term implantation is ensured; then, the conveying sheath 3 is continuously withdrawn, and the short supporting legs 141 are released firstly to contact with the vessel wall; the delivery sheath 3 is then retracted and the long support legs 142 are released, thereby completing the release of the strainer 1.

In the embodiment, the soft guide wire at the front end penetrates through the guide wire cavity of the filter, so that the non-inclination of the recovery hook during release is ensured; 2, the structural design of the supporting legs with long legs improves the stability of the filter when being planted and in a long period; through the matching of the soft guide wire of the push rod and the guide wire cavity, the design of 2 pairs of balance arms and the structural design of 2 pairs of supporting legs with leg lengths, three layers are gradually unfolded during release, so that the filter is prevented from inclining during release and implantation; the point contact mode of the balance arm, the supporting leg and the vessel wall enables the filter to have a long recovery period; the twist-type retaining rivet prevents penetration of the filter through the vessel wall during long-term implantation.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims

1. A vena cava filter system is characterized by comprising a filter, wherein the filter is provided with a tubular filter head end, a thread guide cavity and a recovery hook which are communicated are formed at the filter head end, a plurality of pairs of filter screens which are uniformly distributed extend out of the tail end of the filter head end, supporting legs extend out of the tail ends of the filter screens, fixing rivets are arranged at the tail ends of the supporting legs, and a balance arm extends out of the space between every two adjacent filter screens; wherein, two opposite support legs have the same length, and two adjacent support legs have different lengths.

2. A vena cava filter system according to claim 1, wherein the difference in length between adjacent support legs is 2-5 mm.

3. A vena cava filter system according to claim 1 wherein said balance arm is generally "Y" shaped and comprises a main arm and a pair of arms extending from the distal end of said main arm, each arm being "S" shaped.

4. A vena cava filter system according to claim 1 wherein said securing rivets are of a twist type configuration with a twist angle of 90 °.

5. A vena cava filter system according to claim 1 wherein the filter is a nickel titanium alloy tubing, the filter body is laser cut, and the retrieval hook is formed by a 360 degree laser spiral cut.

6. A vena cava filter system according to claim 1 wherein the number of filter screens, support legs and balance arms is 2 and are all evenly distributed along the axis of the filter head end.

7. A vena cava filter system according to claim 1 further comprising a delivery system comprised of a delivery sheath, introducer, and pushrod.

8. A vena cava filter system according to claim 7 wherein said push rod is comprised of a push rod handle, a hard guide wire secured to the forward end of the push rod handle, and a soft guide wire secured to the forward end of the hard guide wire; the outer diameter of the soft guide wire is smaller than the inner diameter of the guide wire cavity, and the outer diameter of the hard guide wire is larger than the inner diameter of the guide wire cavity.

9. A vena cava filter system according to claim 8 wherein the soft guidewire and the stiff guidewire are both stainless steel.