阅读说明：本技术 一种螺旋防歪斜式下腔静脉滤器及其回收装置 (Spiral anti-skew inferior vena cava filter and recovery device thereof ) 是由 张伟 张俊峰 刘宝辉 王觅 王莉杰 李刚 丘宁宁 于 2019-12-17 设计创作，主要内容包括：本发明涉及医疗器械领域,涉及一种螺旋防歪斜式下腔静脉滤器及其回收装置；本发明包括约束环及连接在约束环的第一过滤丝组和第二过滤丝组,约束环的底部连接有回拉钩；约束环上缠绕固定有两根螺旋支撑条,螺旋支撑条的两侧的支撑段在无外力作用时其整体呈S形,螺旋支撑条的单一侧的支撑段为半圆弧型,四个支撑段的旋向均朝向同一旋向；在本发明内,在螺旋支撑条的支撑作用下,配合过滤丝,在支撑固定的作用下,使得下腔静脉滤器能够在患者下腔静脉中保持平稳不会出现歪斜；本发明的螺旋防歪斜式下腔静脉滤器的回收装置,用于对患者的下腔静脉中植入的下腔静脉滤器进行回收取出,方便且安全。(The invention relates to the field of medical instruments, in particular to a spiral anti-deflection inferior vena cava filter and a recovery device thereof; the wire drawing device comprises a restraint ring, a first filter wire group and a second filter wire group, wherein the first filter wire group and the second filter wire group are connected to the restraint ring; two spiral supporting bars are wound and fixed on the restraint ring, the supporting sections on the two sides of each spiral supporting bar are integrally S-shaped when no external force acts on the supporting sections, the supporting section on one side of each spiral supporting bar is semi-circular arc-shaped, and the rotating directions of the four supporting sections all face to the same rotating direction; in the invention, under the supporting action of the spiral supporting bars, the filter wire is matched, and under the supporting and fixing action, the inferior vena cava filter can keep stable in the inferior vena cava of a patient and cannot be inclined; the spiral anti-deflection inferior vena cava filter recovery device is used for recovering and taking out the inferior vena cava filter implanted in the inferior vena cava of a patient, and is convenient and safe.)

1. The spiral anti-deflection inferior vena cava filter is characterized by comprising a restraining ring, a first filter wire group and a second filter wire group, wherein the first filter wire group and the second filter wire group are connected to the restraining ring; the bottom of the restraint ring is connected with a back drag hook; the winding is fixed with two spiral support bars on the restraint ring, every the intermediate position of spiral support bar all is in the winding is fixed on the circumference outer wall of restraint ring, every both sides regional section outside the middle winding section of spiral support bar is the support section, its whole S-shaped that is of the support section of spiral support bar' S both sides when no exogenic action, the support section of the single side of spiral support bar is half circular arc type, two four support sections of spiral support bar are in evenly distributed on the circumference angle of restraint ring, and four support sections revolve to all towards same the direction of revolving.

2. The spiral anti-skew inferior vena cava filter according to claim 1, wherein a head portion of the second filter wire is provided with a hook.

3. A spiral anti-skew inferior vena cava filter recovery device is used for recovering and taking out an inferior vena cava filter implanted in the inferior vena cava of a patient and is characterized by comprising an outer sleeve and a recovery mechanism which is connected in the outer sleeve and used for sleeving or hooking the inferior vena cava filter.

4. The spiral anti-skew inferior vena cava filter recovery device according to claim 3, it is characterized in that the recovery mechanism comprises a first furling pipe and a second furling pipe which are sleeved in the outer sleeve, a first furling groove is arranged in the first furling pipe, a second furling groove is arranged in the second furling pipe, the first furling pipe is positioned in the first furling groove, a first push-pull soft rod groove and a first toggle groove are arranged in the first furling pipe, a first push-pull tightening rod is connected in the first push-pull soft rod groove in a sliding manner and is connected with a first shifting block positioned on the first shifting groove, and a second pushing and pulling soft rod groove and a second shifting groove are formed in the second furling pipe, a second pushing and pulling tensioning rod is connected in the second pushing and pulling soft rod groove in a sliding mode, and the second pushing and pulling tensioning rod is connected with a second shifting block positioned on the second shifting groove.

5. The retrieval apparatus according to claim 4, wherein the first push-pull tightening rod comprises a first push-pull flexible rod and a first elastic tightening piece, the first push-pull flexible rod is connected to the first pulling block, and the first pulling block pushes the first push-pull flexible rod to extend the first elastic tightening piece out of the first gathering groove.

6. The retrieval apparatus according to claim 5, wherein the second push-pull tightening rod comprises a second push-pull flexible rod and a second elastic tightening piece, the second push-pull flexible rod is connected to the second pulling block, and the second pulling block pushes the second push-pull flexible rod to extend the second elastic tightening piece out of the second gathering groove.

7. The recycling device of the spiral anti-skew inferior vena cava filter according to claim 3, wherein the recycling mechanism comprises an inner sleeve sleeved in the outer sleeve and a recycling net fixing ring connected to the inner sleeve, the head of the inner sleeve is connected with four elastic skeleton strips, and the recycling net is connected to the elastic skeleton strips and the recycling net fixing ring.

8. The recycling device of claim 3, wherein the recycling mechanism comprises an inner sleeve sleeved in the outer sleeve and an elastic rod, the middle of the elastic rod is bent and clamped in the inner sleeve, and an elastic hook is arranged at one end of the elastic rod.

9. The recycling device of the spiral anti-skew inferior vena cava filter according to claim 3, wherein the recycling mechanism comprises an inner sleeve sleeved in the outer sleeve, a blocking core connected to the inner sleeve, and a plurality of elastic rods, and the heads of the elastic rods are provided with elastic hooks.

10. The retrieval apparatus of claim 8, wherein the resilient rod is provided with a cutting blade, the cutting blade being located on one side of the resilient hook.

Technical Field

The invention relates to the field of medical instruments, in particular to a spiral anti-deflection inferior vena cava filter and a recovery device thereof.

Background

Deep venous thrombosis becomes a common disease which endangers human health, and due to aging and the annual rise of the incidence of the deep venous thrombosis, serious complication pulmonary artery embolism and pulmonary infarction can be caused because the deep venous thrombosis in the lower limbs falls off and flows to the heart along the blood flow direction besides causing serious limb swelling, lower limb varicose veins and venous ulcer, and the death rate is extremely high, so that the life of a patient is seriously threatened.

The traditional operation treatment is to open the chest and the pulmonary artery after the pulmonary artery embolism happens and then cut the thrombus, which has large wound and large danger. As intraluminal techniques have advanced, vena cava filters have been placed in the inferior vena cava as the only invasive means of preventing pulmonary embolism from occurring. The placement of the inferior vena cava filter adopts a percutaneous puncture method, and the metal filter is placed in the inferior vena cava through a catheter conveyor, so that the filter can prevent large thrombus from ascending, prevent fatal pulmonary embolism from occurring or reduce pulmonary artery embolism from occurring; compared with the traditional surgical operation, the percutaneous inferior vena cava filter placement is simple, safe and effective, and has been widely adopted in recent years.

At present, the filter has more types, and the temporary filter and the permanent filter are mainly used from the beginning, but the permanent inferior vena cava filter can be used as the temporary filter and can also be used as the permanent filter to be kept in the body as serious complications such as secondary inferior vena cava thrombosis, filter displacement and the like can be caused after being kept in the body for a long time, meanwhile, the recyclable filter can be kept in the body for 2 to 3 weeks, the occurrence of pulmonary embolism of a patient in the acute stage of deep vein thrombosis is avoided, the danger of the permanent inferior vena cava filter which is kept in the body for a long time is avoided, and the filter is beneficial to the patient who is not suitable for keeping the inferior vena cava filter. Therefore, vena cava filters are becoming more widely used in the clinic.

However, the existing inferior vena cava filter has the following defects in the using process:

1. in the process of using the inferior vena cava filter by a patient, the inferior vena cava filter is often inclined, and the rear end of the inferior vena cava filter is generally inclined and stuck to the inner wall of a lumen after being inclined, even the puncture of the blood vessel wall is caused, so that the failure of filtering the venous thrombus and other complications are caused.

2. The askew inferior vena cava filter easily causes hyperplasia of intima tissue of a blood vessel wall at the askew position, even if the hyperplasia is grown for a long time, the bifurcation structure of the filter screen can be overgrown, the recovery of the inferior vena cava filter is difficult, and the recovery resistance is large.

3. The current recoverable inferior vena cava filter rear end is provided with retrieves the hook, retrieve the hook and then retrieve the inferior vena cava filter through catching the ring cover when needing to retrieve the operation, nevertheless because retrieve the hook and catch the ring all small, survey and operate in the vein and all have very big limitation, will catch the ring cover to retrieve the hook and have very big degree of difficulty at present in-service operation, the cover often can appear and get the failure, the operation time has been prolonged, the operation progress has been slowed down, the painful time of the patient of extension.

4. Meanwhile, in the process of recovering and extracting the recyclable inferior vena cava filter, an operating doctor is required to be in a state of high mental concentration and precise operation for a long time, the energy and physical strength of the operating doctor are greatly consumed, and the examination is performed on the subsequent operation of the operating doctor.

5. Traditional recoverable inferior vena cava filter if appear crooked or appear hyperplasia with the vascular wall when can very big improvement retrieve the degree of difficulty, can lead to catching the unable set of ring and getting to retrieve the hook and cause the recovery failure even, this kind of condition appears and then need carry out the operation of opening the abdomen to the patient and take out the filter, has increaseed the risk of operation degree of difficulty and patient, further painful degree that has increaseed the patient, treatment cost and treatment time have been increased, be equivalent to the secondary damage to the patient, have very big burden in the heart.

Disclosure of Invention

In order to solve the above problems, the present invention provides a spiral anti-skew inferior vena cava filter, which is supported by a spiral support bar, and matched with a filter wire, so that the inferior vena cava filter can keep stable in the inferior vena cava of a patient without skewing under the supporting and fixing effects; the spiral anti-deflection type inferior vena cava filter recovery device is also provided and is used for recovering and taking out the inferior vena cava filter implanted in the inferior vena cava of a patient.

The purpose of the invention is realized by the following technical scheme:

the invention provides a spiral anti-deflection inferior vena cava filter, which comprises a restriction ring, a first filter wire group and a second filter wire group, wherein the first filter wire group and the second filter wire group are connected to the restriction ring; the bottom of the restraint ring is connected with a back drag hook; the winding is fixed with two spiral support bars on the restraint ring, every the intermediate position of spiral support bar all is in the winding is fixed on the circumference outer wall of restraint ring, every both sides regional section outside the middle winding section of spiral support bar is the support section, its whole S-shaped that is of the support section of spiral support bar' S both sides when no exogenic action, the support section of the single side of spiral support bar is half circular arc type, two four support sections of spiral support bar are in evenly distributed on the circumference angle of restraint ring, and four support sections revolve to all towards same the direction of revolving.

As a modification of the invention, the head of the second filter wire is provided with a hook.

A spiral anti-skew inferior vena cava filter recovery device is used for recovering and taking out an inferior vena cava filter implanted in the inferior vena cava of a patient, and comprises an outer sleeve and a recovery mechanism which is connected in the outer sleeve and used for sleeving or hooking the inferior vena cava filter.

As a further improvement of the present invention, the recovery mechanism includes a first furling pipe and a second furling pipe sleeved in the outer sleeve, a first furling groove is disposed in the first furling pipe, a second furling groove is disposed in the second furling pipe, the first furling pipe is located in the first furling groove, a first push-pull soft rod groove and a first toggle groove are disposed in the first furling pipe, a first push-pull tightening rod is slidably connected in the first push-pull soft rod groove, the first push-pull tightening rod is connected to a first toggle block located on the first toggle groove, a second push-pull soft rod groove and a second toggle groove are disposed in the second furling pipe, a second push-pull tightening rod is slidably connected in the second push-pull soft rod groove, and the second push-pull tightening rod is connected to a second toggle block located on the second toggle groove.

As a further improvement of the present invention, the first push-pull tightening rod includes a first push-pull soft rod and a first elastic tightening piece, the first push-pull soft rod is connected to the first shifting block, and the first shifting block pushes the first push-pull soft rod to make the first elastic tightening piece extend out of the first furling groove.

As a further improvement of the present invention, the second push-pull tightening rod includes a second push-pull soft rod and a second elastic tightening piece, the second push-pull soft rod is connected to the second shifting block, and the second shifting block pushes the second push-pull soft rod to make the second elastic tightening piece extend out of the second furling groove.

As a further improvement of the invention, the recovery mechanism comprises an inner sleeve sleeved in the outer sleeve and a recovery net fixing ring connected to the inner sleeve, the head of the inner sleeve is connected with four elastic framework strips, and the recovery net is connected to the elastic framework strips and the recovery net fixing ring.

As a further improvement of the invention, the recovery mechanism comprises an inner sleeve and an elastic rod which are sleeved in the outer sleeve, the middle part of the elastic rod is bent and clamped in the inner sleeve, and one end of the elastic rod is provided with an elastic hook.

As a further improvement of the invention, the recovery mechanism comprises an inner sleeve sleeved in the outer sleeve, and a blocking core and a plurality of elastic rods which are connected with the inner sleeve, wherein the heads of the elastic rods are provided with elastic hooks.

As a further improvement of the invention, a cutting knife is arranged on the elastic rod, and the cutting knife is arranged on one side of the elastic hook.

In the invention, under the supporting action of the spiral supporting bars, the filter wire is matched, and under the supporting and fixing action, the inferior vena cava filter can keep stable in the inferior vena cava of a patient and cannot be inclined; the spiral anti-deflection inferior vena cava filter recovery device is used for recovering and taking out the inferior vena cava filter implanted in the inferior vena cava of a patient, and is convenient and safe.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a first schematic structural view of a spiral anti-skew inferior vena cava filter of the present invention;

FIG. 2 is a schematic structural view of a spiral anti-skew inferior vena cava filter according to a second embodiment of the present invention;

FIG. 3 is a third schematic structural view of a spiral anti-skew inferior vena cava filter of the present invention;

FIG. 4 is a first schematic structural diagram illustrating a first recycling device of the spiral anti-skew inferior vena cava filter according to a first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a first embodiment of a recycling device of the spiral anti-skew inferior vena cava filter of the present invention;

FIG. 6 is a first expanded view of the first embodiment;

FIG. 7 is a second expanded view of the first embodiment;

FIG. 8 is a third expanded view of the first embodiment;

FIG. 9 is a first drawing tube according to the first embodiment;

FIG. 10 is a side view of a first gathering tube of the first embodiment;

FIG. 11 is a first drawing/pushing tie bar according to the first embodiment;

FIG. 12 is a schematic view showing the mounting structure of a first push-pull tension bar according to the first embodiment;

FIG. 13 is a side view of the first embodiment;

FIG. 14 is a side view of a second collapsed tube of the first embodiment;

FIG. 15 is a schematic structural view of a second furled tube in accordance with the first embodiment;

FIG. 16 is a schematic view showing the mounting structure of a second push-pull tension bar according to the first embodiment;

figure 17 is a schematic view of a cinching inferior vena cava filter of the first embodiment;

FIG. 18 is a schematic view of the first embodiment in an extended state;

FIG. 19 is an internal schematic view of a cinched inferior vena cava filter according to an example embodiment;

fig. 20 is a schematic connection diagram of the first and second blocks according to the first embodiment;

FIG. 21 is an internal view of the first and second blocks according to the first embodiment;

FIG. 22 is a schematic view of a first application of a second embodiment of the spiral anti-skew inferior vena cava filter recovery device of the present invention;

FIG. 23 is a schematic view of a second embodiment of the recycling device of the spiral anti-tilting inferior vena cava filter of the present invention;

FIG. 24 is a third schematic view showing the application of the second embodiment of the spiral anti-tilting inferior vena cava filter recovery device of the present invention;

FIG. 25 is a fourth schematic view illustrating an application of a second embodiment of the recycling device of the spiral anti-tilting inferior vena cava filter of the present invention;

FIG. 26 is a schematic diagram showing a fifth application of a second embodiment of the recycling device for spiral anti-skew inferior vena cava filter according to the present invention;

FIG. 27 is a sixth schematic view showing an application of a second embodiment of the recycling device for spiral anti-skew inferior vena cava filter according to the present invention;

FIG. 28 is a seventh application diagram of the second embodiment of the recycling device of the spiral anti-skew inferior vena cava filter of the present invention;

FIG. 29 is an eighth schematic view illustrating an application of a second embodiment of the recycling device of the spiral anti-tilting inferior vena cava filter of the present invention;

FIG. 30 is a ninth schematic view illustrating an application of a second embodiment of the recycling device of the spiral anti-tilting inferior vena cava filter of the present invention;

FIG. 31 is a schematic diagram showing the application of a second embodiment of the recycling device for spiral anti-skew inferior vena cava filter of the present invention;

FIG. 32 is an expanded view of the second embodiment;

figure 33 is a schematic tightening diagram of the second embodiment;

FIG. 34 is a first schematic view of an embodiment of a recycling device of the spiral anti-skew inferior vena cava filter of the present invention;

FIG. 35 is a schematic view of a second embodiment of the recycling device of the spiral anti-tilting inferior vena cava filter of the present invention;

FIG. 36 is a third schematic view showing the application of the third embodiment of the recycling device of the spiral anti-skew inferior vena cava filter of the present invention;

FIG. 37 is a fourth schematic view showing the application of the third embodiment of the recycling device for spiral anti-skew inferior vena cava filter of the present invention;

FIG. 38 is a schematic diagram showing a fifth application of a third embodiment of the recycling device for spiral anti-skew inferior vena cava filter of the present invention;

FIG. 39 is a first schematic view illustrating the application of a fourth embodiment of the recycling device of the spiral anti-tilting inferior vena cava filter of the present invention;

FIG. 40 is a schematic diagram of a second application of a fourth embodiment of the spiral anti-skew inferior vena cava filter recovery device of the present invention;

FIG. 41 is a third schematic view showing the application of a fourth embodiment of the recycling device for spiral anti-skew inferior vena cava filter according to the present invention;

FIG. 42 is a fourth schematic view illustrating the application of the fourth embodiment of the recycling device of the spiral anti-skew inferior vena cava filter of the present invention;

FIG. 43 is a first schematic view of an embodiment of a fifth recycling device for spiral anti-skew inferior vena cava filter according to the present invention;

FIG. 44 is a schematic diagram showing the application of the fifth embodiment of the recycling device of the spiral anti-skew inferior vena cava filter of the present invention;

FIG. 45 is a first schematic structural diagram according to a fifth embodiment;

FIG. 46 is a second schematic structural view according to the fifth embodiment;

wherein the reference numerals are: 1-inferior vena cava filter, 11-restriction ring, 12-first filter wire, 13-second filter wire, 14-retraction hook, 15-spiral support bar, 16-hook, 2-retraction device, 21-outer cannula, 22-retraction mechanism, 23-first retraction tube, 231-first retraction groove, 232-first push-pull soft rod groove, 233-first push-pull tightening rod, 234-first push-pull soft rod, 235-first elastic tightening piece, 236-first toggle groove, 237-first shifting block, 24-second retraction tube, 241-second retraction groove, 242-second push-pull soft rod groove, 243-second push-pull tightening rod, 244-second push-pull soft rod, 245-second elastic tightening piece, 246-second toggle groove, 247-second shifting block, 25-inner cannula, 251-recovery net fixing ring, 252-elastic framework strip, 253-recovery net, 254-elastic rod, 255-elastic hook, 256-blocking core and 257-cutting knife.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 46, the spiral anti-deflection inferior vena cava filter 1 provided by the present invention comprises a restriction ring 11, and a first filter wire group and a second filter wire group connected to the restriction ring 11, wherein the first filter wire group comprises first filter wires 12 uniformly distributed, the second filter wire group comprises second filter wires 13 uniformly distributed, and a second filter wire 13 is arranged between adjacent first filter wires 12; the bottom of the restraining ring 11 is connected with a back pulling hook 14.

As shown in fig. 1 to 3, two spiral supporting strips 15 are wound and fixed on the confinement ring 11, the middle position of each spiral supporting strip 15 is wound and fixed on the outer wall of the circumference of the confinement ring 11, two side sections outside the middle winding section of each spiral supporting strip 15 are supporting sections, the supporting sections on two sides of the spiral supporting strip 15 are integrally S-shaped when no external force is applied, the supporting section on one side of the spiral supporting strip 15 is semi-circular, four supporting sections of the two spiral supporting strips 15 are uniformly distributed on the circumferential angle of the confinement ring 11, and the rotation directions of the four supporting sections all face to the same rotation direction; the head of the second filter wire 13 is provided with a hook 16.

In the invention, under the supporting action of the spiral supporting strip 15, the filter wire is matched, and under the supporting and fixing action, the inferior vena cava filter 1 can keep stable in the inferior vena cava of a patient and can not be inclined; the spiral anti-deflection inferior vena cava filter recovery device is used for recovering and taking out the inferior vena cava filter 1 implanted in the inferior vena cava of a patient, and is convenient and safe.

According to a first embodiment of the present invention, as shown in fig. 4 to 21, a spiral anti-tilting inferior vena cava filter recovery device 2 according to the present invention is used for recovering and taking out an inferior vena cava filter 1 implanted in an inferior vena cava of a patient, and comprises an outer cannula 21 and a recovery mechanism 22 connected inside the outer cannula 21 and used for hitching or hooking the inferior vena cava filter; the recovery mechanism 22 comprises a first furling pipe 23 and a second furling pipe 24 which are sleeved in the outer sleeve 21, a first furling groove 231 is arranged in the first furling pipe 23, a second furling groove 241 is arranged in the second furling pipe 24, the first furling pipe 23 is positioned in the first furling groove 231, a first push-pull soft rod groove 232 and a first toggle groove 236 are arranged in the first furling pipe 23, a first push-pull tightening rod 233 is connected in the first push-pull soft rod groove 232 in a sliding manner, the first push-pull tightening rod 233 is connected with a first toggle block 237 positioned on the first toggle groove 236, a second push-pull soft rod groove 242 and a second toggle groove 246 are arranged in the second furling pipe 24, a second push-pull tightening rod 243 is connected in the second push-pull soft rod groove 242 in a sliding manner, and the second push-pull tightening rod 243 is connected with a second toggle block 247 positioned on the second toggle groove 242; the first push-pull tightening rod 233 includes a first push-pull soft rod 234 and a first elastic tightening piece 235, the first push-pull soft rod 234 is connected to a first shifting block 237, and the first shifting block 237 pushes the first push-pull soft rod 234 to extend the first elastic tightening piece 235 out of the first gathering slot 231. The second push-pull tightening rod 243 comprises a second push-pull soft rod 244 and a second elastic tightening piece 245, the second push-pull soft rod 244 is connected with a second shifting block 247, and the second shifting block 247 pushes the second push-pull soft rod 244 to enable the second elastic tightening piece 245 to extend out of the second gathering groove 246.

Specifically, in the first embodiment, the outermost layer is the outer sleeve 21, the cross section of the outer sleeve 21 is a closed semicircular shape, the outer sleeve 21 is sleeved with the first furling tube 23, the same front section of the first furling tube 23 is a semicircular arc shape with a half opening, the cross section of the rear section of the first furling tube 23 is a closed semicircular shape, the front section semicircular cross section of the first furling tube 23 is not closed, the symmetrical sides of the front section semicircular arc tube wall of the first furling tube 23 are designed to be openings, so that the front section semicircular arc tube wall of the first furling tube 23 is of an open structure, the two sides of the front end section semicircular arc tube wall of the first furling tube 23 are provided with arc concave abdicating grooves, the shapes of the abdicating grooves at the two sides of the front tube wall end section of the first furling tube 23. A first furling groove 231 is arranged at the interlayer of the arc tube wall at the end face of the front end of the first furling tube 23, the first furling groove 231 is provided with a larger notch along the arc trend of the tube wall at the end face of the front end of the first furling tube 23, the first furling groove 231 narrows from the notch to the middle along the arc radian at the two sides of the first furling groove 231 backwards along the axial direction, a first push-pull soft rod groove 232 is communicated with the tail end of the first furling groove 231, the width of the first push-pull soft rod groove 232 is narrower, the first push-pull soft rod groove 233 is extended to the handle end of the rear end of the first furling tube 23 backwards along the axial direction, a first push-pull tightening rod 233 is communicated in the first furling groove 231 and the first push-pull soft rod groove 232 of the first furling tube 23, the first push-pull tightening rod 233 is divided into two parts which are fixedly connected together, the front area structure is a first elastic tightening piece 235, the rear end structure of the first push-pull soft rod 234 is a first elastic tightening piece 235, has certain strength and elastic deformation characteristic. The first elastic tightening piece 235 has a width that is divergently widened in an arc from the joint of the first push-pull flexible rod 234 to the front end region of the first elastic tightening piece 235, and has a certain length in the axial direction at the region where the width of the front end of the first elastic tightening piece 235 is widened to the maximum. The first elastic tightening piece 235 has an opening state with a slight bending radian to one side without external force, the direction of the bending radian is consistent with the opening direction of the tube wall of the first furling tube 23, the width of the first elastic tightening piece 235 is far greater than that of the first furling groove 231, so that the area of the front section of the first elastic tightening piece 235 close to the first furling tube 23 is always positioned outside the notch of the first furling groove 231 at the front end of the first furling tube 23, the first push-pull soft rod 234 fixedly connected with the rear end of the first elastic tightening piece 235 is in a long strip shape, is led into the first push-pull soft rod groove 232 of the first furling tube 23, and also extends to the position area of the handle end at the rear end of the first furling tube 23.

When the first push-pull soft rod 234 of the first push-pull tightening rod 233 is controlled to be pulled axially backwards at the handle end, the arc-expanding section of the first elastic tightening piece 235 at the front end of the first push-pull tightening rod 233, which diverges from the width of the rear end region, is pulled back to the inside of the notch of the first closing groove 231 at the front end of the first closing tube 23, under the restriction of the arc notch of the first closing groove 231, the first elastic tightening piece 235 is closed to the same radian as the notch of the first closing groove 231, at this time, both sides of the first elastic tightening piece 235 are both arc-bent under the closing action of the notch of the first closing groove 231, finally, the left and right end regions of the first elastic tightening piece 235 are overlapped with each other like a circumferential spiral structure to form end edges of a certain region, at this time, the first elastic tightening piece 235 is in a tightening state, and because the width of the front end of the first elastic tightening piece 235 is much greater than that of the notch of the first closing groove 232, the width of the notch of the first closing groove 232 is approximately equal to the width, so that the first elastic tightening piece 235 can not be completely retracted into the collecting groove during the backward pulling process of the first push-pull soft rod 234, and the notch of the first collecting groove 231 has an axial limiting effect on the first push-pull tightening rod 233. A second furling pipe 24 is sleeved in the first furling pipe 23, the structure and the shape of the second furling pipe 24 are the same as those of the first furling pipe 23, and the outer diameter of the second furling pipe 24 is smaller than the inner diameter of the first furling pipe 23, so that the second furling pipe 24 can be sleeved in the opening of the first furling pipe 23; a second push-pull tightening rod 243 with the same structure as the first push-pull tightening rod 233 is also introduced into the second furling groove 241 at the front end of the second furling tube 24, and the size of a second elastic tightening piece 245 at the front end of the second push-pull tightening rod 243 is slightly smaller than that of the first elastic tightening piece 235; the rear ends of the first furling tube 23 and the second furling tube 24 are both handle ends, a first shifting groove 236 and a second shifting groove 246 with a certain length are axially formed on the tube walls corresponding to the rear section areas of the push-pull soft rod grooves of the two furling tubes, a first shifting block 237 and a second shifting block 247 are respectively and fixedly protruded at the rear ends of the first push-pull soft rod 234 and the second push-pull soft rod 244 and respectively extend out of the furling tube wall from the corresponding shifting grooves, so that medical personnel can shift the first shifting block 237 and the second shifting block 247 to control the push-pull of the two groups of push-pull tightening rods, and protruded check rings are respectively and fixedly integrated at the rear end heads of the first furling tube 23 and the second furling tube 24, thereby facilitating the medical personnel to carry out handheld operation.

When the inferior vena cava filter implanted in the inferior vena cava of a patient needs to be taken out or needs to be taken out when the inferior vena cava filter is inclined in the lumen, the embodiment I is used, the front end of the inferior vena cava filter 1 is led into the inferior vena cava of the patient by opening a hole at a designated position of the skin of the patient through a minimally invasive technology, and then a conveying sleeve and an internal folding tube thereof reach the area near the inferior vena cava filter 1 in the inferior vena cava. When the inferior vena cava filter 1 in a patient body is attached to the inner wall of a vein by a rear end pull-back hook structure due to long skew time, so that the cavity wall of the inferior vena cava filter 1 is subjected to tissue hyperplasia, the pull-back hook of the inferior vena cava filter 1 is wrapped to a certain degree, the filter wires of the inferior vena cava filter 1 are integrally forward-divergent from the root to the front end, at the moment, a first shifting block 237 and a second shifting block 247 are pushed forward, the two shifting blocks respectively drive two groups of push-pull tightening rods to move forward relative to a furling tube, a first elastic tightening piece 235 and a second elastic tightening piece 245 are separated from a furling groove opening and return to an opening state, a control sleeve enables the first elastic tightening piece 235 and the second elastic tightening piece 245 to be close to the root position of the inferior vena cava filter 1, the root position of the filter wires of the inferior vena cava filter 1 is tightly fixed inside a restraining ring 11, and when the bent inner, the first shifting block 237 at the handle end is pulled backwards, so that the first elastic tightening piece 235 at the front end of the first push-pull tightening rod 233 is bent in an arc shape under the arc notch of the gathering groove, and finally the left and right end areas of the first elastic tightening piece 235 are overlapped with each other like a circumferential spiral structure to form end edges in a certain area, at this time, the filter of the inferior vena cava filter 1 is wrapped inside the spiral circumference of the first elastic tightening piece 235, and then the first gathering tube 23 is pushed forwards at the same time, and the first gathering tube 23 drives the first push-pull tightening rod 233 to move forwards, so that the first elastic tightening piece 235 moves from the root of the filter wire of the inferior vena cava filter 1 to the front end of the filter wire in the gathered tightening state.

When the first elastic tightening piece 235 moves to the front end of the filter wire, the first elastic tightening piece 234 is always in a tightening and closing state when the first elastic tightening piece 234 moves from the root position to the front end of the filter wire in the tightening and closing state of the filter wire, and the filter wire of the inferior vena cava filter 1 is closed from a diverging state to a tightening state under the tightening and moving effects of the first elastic tightening piece 234; because the hooks 16 which are bent outwards are designed at the end parts of the filter wires of the inferior vena cava filter 1, wherein the circumference of the filter wires is provided with four second filter wires 13, the fixation effect can be realized in the inferior vena cava of a patient, and the hooks 16 of the four filter wires with the positioning effect are hung at the front end edge of the first elastic lacing piece 235, so that the filter wires can not fall off from the first elastic lacing piece 1. After the first elastic tightening piece 235 completes tightening action on the front end of the second filter wire 13, the second shifting block 247 at the handle end is pulled backwards, so that the second elastic tightening piece 245 at the front end of the second push-pull tightening rod 243 is bent in an arc under the action of the arc notch of the second furling groove 241 of the second furling pipe 24, and the root area of the filter wire is folded and wrapped; after the operation is finished, the upper end and the lower end of the inferior vena cava filter 1 are wrapped and fixed by the two elastic tightening pieces, the catheter device is pulled backwards, the elastic tightening pieces at the front ends of the two push-pull tightening rods pull the inferior vena cava filter 1 backwards to enable the drag hook structure at the rear end to be separated from the tissue hyperplasia part of the inner wall of the inferior vena cava, then the catheter device is controlled to enable the inferior vena cava filter 1 to gradually move backwards to be separated from the inferior vena cava, then the sleeve is led in to fold the inferior vena cava filter 1, and finally the inferior vena cava filter is taken.

As shown in fig. 22 to 32, according to a second embodiment of the present invention, in the second embodiment, the recovery mechanism 2 includes an inner cannula 25 sleeved in the outer cannula 21 and a recovery net fixing ring 251 connected to the inner cannula 25, the head of the inner cannula 25 is connected to four elastic skeleton strips 252, and the recovery net 253 is connected to the elastic skeleton strips 252 and the recovery net fixing ring 251; specifically, the second embodiment mainly includes an outer cannula 21 and an inner cannula 25, the outer cannula 21 is sleeved outside the inner cannula 25, a recovery net fixing ring 251 is fixedly sleeved at the front end of the inner cannula 25, the front end of the recovery net fixing ring 251 is uniformly distributed and fixed with a plurality of elastic framework bars 252 (four elastic framework bars 252 are adopted in the scheme) in a circumferential angle and integrally, the elastic framework bars 252 have memory elasticity, and the four elastic framework bars 252 at the front end of the recovery net fixing ring 251 are integrally bent and diverged towards the front and towards the outside under the action of no external force and are shaped like a cone; when the outer cannula 21 moves forwards and axially relative to the inner cannula 25 and plays a role in folding the elastic framework strips 252, the elastic framework strips 252 are elastically deformed and folded into the outer cannula 21, a similar grabbing hook-shaped structure which is bent inwards is designed at the front end of each elastic framework strip 252, so that the success rate of grabbing the rear end part of the inferior vena cava filter 1 when the elastic framework strips 252 are folded is improved, the recovery net 253 is attached to each elastic framework strip 252, the recovery net 253 is woven and has woven meshes with a certain size, the mesh size can enable the recovery hook 14 of the inferior vena cava filter 1 to penetrate through and hook the recovery net 253, and when the elastic framework strips 252 are unfolded to the maximum extent, the recovery net can be exactly stretched to the maximum stretching extent. When the inferior vena cava filter 1 of example two is retrieved by hooking through the inferior vena cava retrieval device of example two, the front end of the recovery device of the inferior vena cava filter is conveyed to a designated position at the rear end of the inferior vena cava filter, then the inner sleeve 25 is pushed axially forwards, so that the elastic framework strips 252 at the front end of the inner sleeve 25 drive the recovery net 253 to open, then the retraction device of the inferior vena cava filter is pushed forward continuously so that the retraction net 253 approaches and covers the retraction hook at the rear end of the inferior vena cava filter 1, then the outer cannula 21 is pushed forward axially, so that the outer cannula 21 folds the elastic framework bars 252, the elastic framework bars 252 are driven to fold synchronously, in the process of folding the recovery net 253, the meshes of the recovery net 253 capture and hook the retraction hook 255 at the rear end of the inferior vena cava filter 1, the inferior vena cava filter 1 is removed after the hooking is completed by pulling back the inferior vena cava filter recovery device.

As shown in fig. 34 to 38, the present invention provides a third embodiment, in which the recovery mechanism 2 includes an inner sleeve 25 and an elastic rod 254 sleeved in the outer sleeve 21, the middle of the elastic rod 254 is bent and engaged in the inner sleeve 25, and one end of the elastic rod 254 is provided with an elastic hook 255; in the third embodiment, the recovery device of the inferior vena cava filter is also the outer sleeve 21, the inner sleeve 25 is sleeved inside the recovery device, the front end of the inner sleeve 25 is fixedly provided with the elastic hook 255, the elastic hook 255 is similar to an elastic buckle type design, the elastic hook 255 is two elastic rods 254 extending from the front end of the inner sleeve 25, one elastic rod is slightly long and the rear section is a straight section, the front end is of an arc-shaped bent structure, the other elastic rod is slightly short and is a straight section, a certain angle is formed between the two elastic rods 254 to be in an open state, and the arc-shaped bent hooking direction at the front end of the slightly long elastic rod 254 is the elastic rod direction with a shorter length; when the two elastic rods 254 have certain elastic deformation characteristics and the elastic hook is in a state without external force, the two elastic rods 254 of the elastic hook 255 are mutually expanded, so that the opening between the two elastic rods 254 of the elastic hook 255 is expanded; when the elastic hooks 255 are closed under the forward pushing action of the outer sleeve 21, the included angle between the two elastic rods 254 is reduced, and the elastic rod 254 with the shorter length abuts against the arc of the elastic rod 254 with the longer length to bend and fold the tail end, so that the elastic hooks are closed. When the hooking and withdrawing of the inferior vena cava filter 1 are required by the third embodiment, the elastic hook 255 is released to hook the root of the filter wire of the inferior vena cava filter 1 or hook the pull-back hook 14 of the inferior vena cava filter 1, then the elastic hook 255 is closed by pushing forward through the outer sleeve 21, and then the withdrawing device is pulled back to take out the inferior vena cava filter 1.

As shown in fig. 39 to 42, the present invention provides a fourth embodiment, in the fourth embodiment, the recovery mechanism 2 includes an inner sleeve 25 sleeved in the outer sleeve 21, and a core stopper 256 and a plurality of elastic rods 254 connected to the inner sleeve 25, the heads of the elastic rods 254 are provided with elastic hooks 255; specifically, the recycling device of the inferior vena cava filter of example four was modified from the elastic hook structure of example three, from a single elastic hook structure of example three to the circumferentially diverging elastic hook of example four, in the fourth embodiment, a plurality of elastic hooks (four groups of elastic hooks are adopted in the present embodiment) are fixedly connected to the inner sleeve 25 in a divergent manner toward the front, each elastic hook 255 is an elastic rod 254 having a circular arc bending and folding type in the third embodiment, meanwhile, the axial center position of the front end of the inner sleeve 21 is fixedly connected with a unique blocking core 256 along the axial direction, when the divergent elastic hooks are in a state without external force, the elastic hooks uniformly distributed on the circumference are simultaneously diverged and expanded outwards, an opening is arranged between each elastic hook and the blocking core 256, when the outer sleeve 21 is pushed forward to simultaneously fold the diverging elastic hooks, the openings of the elastic hooks uniformly distributed around the circumference are all closed by the same stopper 256. The hooking and recovering mode of the recovering device 2 for the inferior vena cava filter 1 in the fourth embodiment is basically the same as that in the third embodiment, and compared with the third embodiment, the success rate of hooking can be greatly improved by adopting the diverging elastic hook hooking mode with uniformly distributed circumference in the fourth embodiment.

As shown in fig. 43 to 46, the present invention provides a fifth embodiment, in the fifth embodiment, a cutting blade 257 is disposed on the elastic rod 254, the cutting blade 257 is disposed on one side of the elastic hook 255, and the structure of the fifth embodiment is slightly modified based on the third embodiment, in the fifth embodiment, a cutting blade 257 is fixedly connected to an inner side position of an arc-folded section of the longer elastic rod of the elastic hook 255 of the third embodiment, the cutting blade 257 has a blade edge similar to a V-shaped trend, and by using the cutting blade 257 of this type, hyperplasia of tissue of a tube wall at a back end pull-back hook of the askew inferior vena cava filter 1 can be cut off, so that the inferior vena cava filter 1 can be rapidly separated from an inner wall of a tube cavity, and by disposing the cutting blade 257 inside the elastic hook 255, the elastic hook structure has dual functions of tissue hyperplasia cutting and hook-back hook pulling of the inferior vena cava filter, and by disposing the cutting blade 257 inside the elastic hook 255, the fifth embodiment can also enable the fifth embodiment to cut The raised tissue hyperplasia can be hooked, so that the tissue hyperplasia can be conveniently cut off; after the tissue of the retraction hook at the inner wall of the lumen is proliferated after the resection of the rear end of the inferior vena cava filter, the opened elastic hook 255 is released again to hook the root of the filter wire of the inferior vena cava filter 1 or the retraction hook, and then the inferior vena cava filter 1 is recovered and taken out through the subsequent operation.

The invention has the following beneficial effects:

1. the lower vena cava filter is closed and fastened from the side direction by adopting an elastic fastening piece which can be bent in an arc shape and is in a spiral circumferential state, the rear end of the lower vena cava filter which is inclined in the lower vena cava is attached to the inner wall of a lumen, even tissue hyperplasia occurs, the traditional fixing method of sleeving from the rear end can not be fixed with a sleeving and fixing structure due to the tissue hyperplasia, and the elastic fastening piece is made of a material with certain strength and elastic deformation and can ensure that the lower vena cava filter can be stable when the side arc is bent and closed; compared with the conventional hooking recovery device, the filter wire root of the lower vena cava filter can be quickly closed, a rear end pull-back hook does not need to be hooked, and tissue hyperplasia does not occur.

2. The boundaries of two sides of the rear end of the elastic lacing piece adopt a wing-shaped design which is diverged and opened towards the direction of two sides, and the trend elastic lacing piece of the arc notch is folded to the radian same as that of the arc notch by increasing and decreasing the extension length of the rear end inside the arc notch of the folding pipe; after being folded, the elastic tightening piece is in a circumferential spiral type, and the areas of the two end edges are mutually overlapped, so that the inferior vena cava filter can be prevented from falling off. The operation is simple, the structure is stable, and compared with the operation of the medical staff at the handle end, the deformation of the front end has no hysteresis.

3. The first furling pipe 23 and the second furling pipe 24 have the same structure, and adopt 2 that the front section adopts a semi-circular opening sleeve structure, the section of the rear section is a closed semi-circular structure, the front section adopts an opening aiming at enabling the second furling pipe 24 to extend out from the opening at the lower side of the first furling pipe 23, the front end of the first furling pipe 23 adopts a circular arc-shaped sunken notch structure, which is convenient for the opening of the second elastic lacing film 245 of the second furling pipe 24 to play a abdicating role, and meanwhile, the structural stability of the second furling pipe 24 sleeved in the first furling pipe 23 can not be damaged; meanwhile, the section of the same front section of the outer sleeve sleeved on the periphery of the first furling tube 23 is a closed semicircle, and by adopting the structure, the outer sleeve 21 plays a role in preventing the furling tube from rotating, so that the situation that the opening of the elastic lacing piece is not aligned with the direction of the inferior vena cava filter when the furling tube is tightened is avoided.

4. The pole is tightened in the push-and-pull adopts elasticity to tighten piece 235 and the soft pole fore-and-aft structure combination of push-and-pull to form, it has bellied shifting block to fix an organic whole at the soft pole rear end of push-and-pull, the cooperation draws in the groove of stirring of managing the rear end in, make can tighten the pole in handle end side direction pipe wall department and carry out the axial back-and-forth movement to the push-and-pull, the space has been saved, simultaneously can control the removal in the side direction and can make the soft pole of push-and-pull whole section be in the inside guide way of pipe wall that draws in the.

5. In the second embodiment, the spiral supporting strip 15 for preventing the lower vena cava from skewing is fixedly arranged on the restriction ring 11 at the rear end of the lower vena cava filter 1, the outer end of the spiral supporting strip 15 is attached to and supported on the inner wall of the lumen by a structure which is spirally dispersed from the middle to the circumference, and the front end of the lower vena cava filter is matched with the filter wire with the hook 16 and then supported on the inner wall of the lumen in a matching manner, so that the lower vena cava filter can not skew all the time in the whole process of the inner part of the lower vena cava of a patient, and the trouble caused by the pain and skewing of the patient.

6. In the second embodiment, the recovery net 253 is attached to the elastic framework strip 252 capable of elastically stretching to hook and recover the inferior vena cava filter, and the mesh of the woven recovery net 253 can hook a retractor hook at the rear end of the inferior vena cava filter in the process of being matched with the elastic framework strip 252 to be folded, so that the operation is convenient and rapid, the success rate of hooking and retracting the retractor hook is high, and the operation efficiency of the body calibration can be greatly improved; meanwhile, a similar grabbing hook-shaped structure which is bent inwards is designed at the front end of the elastic framework strip 252, so that the grabbing success rate of the rear end part of the inferior vena cava filter when the elastic framework strip 252 is folded is improved.

7. In the third embodiment, the recovery device 2 adopts the elastic hook 255 which is similar to a key elastic buckle and can be opened or closed, the longer elastic rod 254 adopts the arc bending back hook type design, the filter wire or the back pull hook can be effectively prevented from unhooking after being completely hooked, and the target can be quickly hooked by adopting the elastic hook structure.

8. The fourth embodiment can hook the inferior vena cava filter which is more difficult to hook and recycle, the target can be hooked by adopting a plurality of divergent elastic hooks which are uniformly distributed on the circumference to open and close simultaneously, and the uniform opening and closing can be achieved by the backward release and forward furling of the outer sleeve 21, so that the recovery device can release and hook without considering the angle problem of the recovery device after reaching the designated position of the inferior vena cava.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.