CN112206071A - Recovery hook and recovery filter - Google Patents

Abstract

The invention provides a recovery hook and a recovery filter. Recoverable filter includes the filter body and retrieves the hook, the filter body includes at least one and gathers together the portion, retrieve the hook including have hooked recovery portion and integral type set up in the connecting portion of recovery portion one end, connecting portion with gather together the portion along the axial interlude each other and around circumference fixed connection, connecting portion and the fixed connection region who gathers together the portion are great for connecting portion and the firm in connection who gathers together the portion can guarantee to retrieve the joint strength of hook and filter body and reduce stress concentration, and retrieve hook and filter body and can make separately again with both fixed connection after can, it is comparatively convenient to process.

Description

Recovery hook and recovery filter

Technical Field

The invention relates to the technical field of medical instruments, in particular to a recovery hook and a recoverable filter.

Background

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

In cases where anticoagulation contraindication is present or anticoagulation is ineffective, the use of a filter can prevent or reduce the occurrence of pulmonary embolism. The current widely used recyclable filter generally comprises a filter body and a recycling hook arranged at the near end or/and the far end of the filter body, when the filter needs to be recycled, a catching ring is generally adopted to cover the recycling hook, and then a catching catheter connected with the catching ring is withdrawn to drive the catching ring and the recyclable filter to be collected in the recycling sheath. The recovery hook and the filter body are required to have enough connection strength and small stress concentration in the capturing process, so that the recovery hook is prevented from being separated from the filter body and the recovery hook is prevented from being broken.

The existing recovery hook of the recoverable filter generally adopts a metal wire which is integrally formed and then is welded on a gathering part of a filter main body in a spot mode, or the recovery hook and the filter main body are integrally cut and formed by a pipe. The recovery hook made of the metal wire material is fixed on the gathering part of the filter main body in a spot welding mode, so that the processing is easy, however, the metal wire has small diameter and insufficient connection strength, stress concentration is easy to occur, and the risk of separation of the recovery hook and the filter main body and fracture of the recovery hook is large; retrieve the hook and adopt whole cutting shaping with the filter main part, retrieve the hook and can guarantee with the joint strength of filter body, however, the structure is comparatively complicated, the processing of being not convenient for.

Disclosure of Invention

The invention aims to solve the technical problem of providing a recovery hook and a recoverable filter aiming at the defects of the prior art, which can ensure that the recovery hook and a filter body have enough connection strength and are convenient to process and manufacture.

In order to solve the technical problem, the invention provides a recovery hook which is used for pulling a filter body of a recoverable filter, wherein the filter body comprises at least one gathering part, the recovery hook comprises a recovery part with a hook shape and a connecting part integrally arranged at one end of the recovery part, and the connecting part and the gathering part are mutually inserted in the axial direction and fixedly connected in the circumferential direction.

The invention also provides a recoverable filter, which comprises a filter body and a recovery hook, wherein the filter body comprises at least one gathering part, the recovery hook comprises a recovery part with a hook shape and a connecting part which is arranged at one end of the recovery part and integrated with the recovery part, and the connecting part and the gathering part are mutually inserted in the axial direction and fixedly connected in the circumferential direction.

The recovery hook and the filter body of the recoverable filter are respectively and independently manufactured and then fixedly connected, so that the recoverable filter is convenient to process; more importantly, connecting portion and the portion of gathering together alternate each other along the axial and around circumference fixed connection, and connecting portion and the fixed connection area of the portion of gathering together are great for connecting portion and the firm in connection who gathers together the portion can guarantee the joint strength of recovery hook and filter body and reduce stress concentration.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic front view of a recyclable strainer according to a first embodiment of the present invention.

Fig. 2 is a schematic perspective view of a recovery hook of the recoverable filter of fig. 1.

Fig. 3 is a side view of the recovery hook of fig. 2.

Fig. 4 is a partial cross-sectional view of the fixed connection of the retrieval hook of the retrievable strainer of fig. 1 to the strainer body.

Fig. 5 is a schematic view of the fixed connection of the recovery hook of fig. 2 to another type of strainer body.

Fig. 6 is a partial cross-sectional view of the fixed connection of the retrieval hook to the strainer body of fig. 5.

Fig. 7 is a schematic view showing a state of use of the recyclable filter in fig. 5.

Fig. 8 is a schematic perspective view of a recovery hook according to a second embodiment of the present invention.

Fig. 9 is a side view of the recovery hook of fig. 8.

Fig. 10 is a schematic view of the fixed connection of the recovery hook to the strainer body of fig. 8.

Fig. 11 is a partial cross-sectional view of the fixed connection of the retrieval hook to the strainer body of fig. 10.

Fig. 12 is a schematic structural view of a recovery hook according to a third embodiment of the present invention.

Fig. 13 is a partial cross-sectional view of the fixed connection of the retrieval hook to the strainer body of fig. 12.

Fig. 14 is a schematic perspective view of a recovery hook according to a fourth embodiment of the present invention.

Fig. 15 is a side view schematic of the recovery hook of fig. 14.

Fig. 16 is a schematic perspective view of a recovery hook according to a fifth embodiment of the present invention.

Fig. 17 is a side view schematic of the recovery hook of fig. 16.

Fig. 18 is a schematic perspective view of a recovery hook according to a sixth embodiment of the present invention.

Fig. 19 is a side view schematic of the recovery hook of fig. 18.

Fig. 20 is a partial cross-sectional view of the fixed connection of the recovery hook to the strainer body of fig. 18.

Detailed Description

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 any inventive step, are within the scope of the present invention.

Furthermore, the following description of the various embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. Directional phrases used in this disclosure, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the direction of the appended figures and, therefore, are used in order to better and more clearly illustrate and understand the present invention and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in the particular orientation, and, therefore, should not be taken to be limiting of the present invention.

Orientation definition: for clarity of description, the end of the device closer to the catcher is hereinafter referred to as the "proximal end" and the end further from the catcher is hereinafter referred to as the "distal end", the axial direction referring to the direction of the central axis of the device, the radial direction being perpendicular to the central axis, and the circumferential direction being circumferential around said central axis, this definition being for convenience of description only and not to be construed as a limitation of the invention.

Referring to fig. 1 to 4, the present invention provides a recyclable filter 100, which includes a recyclable hook 20 and a filter body 40, wherein the recyclable hook 20 is used for pulling the filter body 40, the recyclable hook 20 includes a recyclable part 22 having a hook shape and a connecting part 24 integrally disposed at one end of the recyclable part 22 and the recyclable part 22; the filter body 40 includes at least one gathering portion 42, and the connecting portion 24 and the gathering portion 42 are axially inserted into each other and fixedly connected around the circumference.

The filter body 40 refers to a main body of the filter with functions of filtering and intercepting thrombus, the structure of the filter body 40 can adopt the existing umbrella type structure, cage type structure, spindle type structure and the like, wherein the near end or the far end of the umbrella type structure is provided with a gathering part, and the connecting part 24 of the recovery hook 20 is fixedly connected with the gathering part around the circumferential direction; the near end and the far end of the filter body 40 with the cage structure and the filter body 40 with the fusiform structure are gathering parts, and the connecting part 24 of the recovery hook 20 is fixedly connected with at least one gathering part in the circumferential direction.

The recovery hook 20 and the filter body 40 of the recoverable filter 100 are respectively and independently manufactured and then fixedly connected, so that the processing is simpler and more convenient; in addition, the connecting portion 24 and the gathering portion 42 are axially and mutually inserted and fixedly connected in the circumferential direction, compared with the prior art, the fixed connection area of the connecting portion 24 and the gathering portion 42 is increased, the connecting portion 24 and the gathering portion 42 are firmly connected, the connection strength of the recovery hook 20 and the filter body 40 can be ensured, stress concentration is reduced, and the recovery hook 20 and the filter body 40 are prevented from being separated and the recovery hook is prevented from being broken.

The filter body 40 includes a filter portion 44 formed by a plurality of struts, and the gathering portion 42 includes a sleeve for gathering one end of the filter portion 44, i.e., the ends of the plurality of struts. The connecting portion 24 may be in a column shape or a tube shape, the connecting portion 24 is inserted into the sleeve or the sleeve is inserted into the connecting portion 24, and the outer peripheral wall of the connecting portion 24 is fixedly connected to the inner peripheral wall of the sleeve or the inner peripheral wall of the connecting portion 24 is fixedly connected to the outer peripheral wall of the sleeve. In this embodiment, the connecting portion 24 is a column, the connecting portion 24 is inserted into the sleeve, and an outer peripheral wall of the connecting portion 24 is fixedly connected with an inner peripheral wall of the sleeve in a circumferential direction.

Specifically, as shown in fig. 1 to 4, in this embodiment, the sleeve and the filtering portion 44 are in a split structure, and the sleeve is fixedly sleeved on one end where the filtering portion 44 converges, that is, the tail ends of the plurality of struts form the converging portion 42.

In this embodiment, the filtering portion 44 is an umbrella structure, and includes a plurality of supporting rods 442, distal ends of the plurality of supporting rods 442 extend in a diverging manner, and proximal ends of the plurality of supporting rods 442 converge at the converging portion 42. Specifically, the proximal ends of the struts 442 are all fixedly inserted into the sleeve.

Preferably, the connection portion 24 is fixedly connected to the sleeve around the circumference by laser welding. As shown in fig. 4, the proximal ends of the plurality of struts 442 are fixedly inserted into the sleeve, the connecting portion 24 is inserted into the sleeve in the axial direction, and then continuously welded around the outer circumferential wall of the sleeve by laser to form at least one circle of welding portion 50, and the welding portion 50 welds the sleeve and the connecting portion 24 together; alternatively, a plurality of welding portions 50 are formed at intervals around the outer circumferential wall of the sleeve by laser welding, the plurality of welding portions 50 are formed in at least one circumferential circle, and the sleeve and the connecting portion 24 are welded together by the respective welding portions 50.

Since the laser welding area is formed on the outer peripheral wall of the connection portion 24, and the diameter of the connection portion 24 is larger than that of the recovery portion 22, the welding area is increased, the connection strength between the recovery hook 20 and the filter body 40 can be remarkably improved, the stress concentration can be remarkably reduced, and the recovery hook 20 is prevented from being broken. On the other hand, the recovery hook 20 and the filter body 40 are designed in a split type, and the recovery hook and the filter body are respectively and independently processed and manufactured and then fixed together through laser welding, so that compared with the existing filter with the recovery hook and the filter body integrally processed, the filter is simpler and more convenient to process.

As shown in fig. 2 and 3, the recovery part 22 includes a hook rod 222 and an extension rod 224 connected between the hook rod 222 and the connection part 24, the extension rod 224 and the connection part 24 both extend in the axial direction, and the cross-sectional area of the connection part 24 in the direction perpendicular to the axial direction is larger than the cross-sectional area of the extension rod 224 in the direction perpendicular to the axial direction.

In this embodiment, the hooking rod 222, the extending rod 224 and the connecting portion 24 are all cylindrical rods, that is, the hooking rod 222, the extending rod 224 and the connecting portion 24 are all circular in cross-sectional shape, and the diameter of the connecting portion 24 is greater than that of the extending rod 224. Preferably, the diameter of the connecting portion 24 is 1.5 times the diameter of the extension rod 224. The hook rod 222 and the extension rod 224 are formed by bending the same round rod. The extension rod 224 is coaxially disposed with the connection portion 24, and the recovery portion 22 and the connection portion 24 are integrally formed.

As shown in FIG. 3, the retrieving portion 22 includes at least one arc segment, and the center of the arc segment and the central axis of the connecting portion 24 are located on the same weight line. In this embodiment, the hook bar 222 corresponds to the arc-shaped section of the recovery part 22, and the range of the central angle corresponding to the arc-shaped section is 90 ° to 270 °, that is, the range of the central angle θ of the hook bar 222 is 90 ° to 270 °, and preferably, the central angle θ of the hook bar 222 is 120 °.

Further, the circle centers of the arc-shaped segments, i.e., the circle center of the hook rod 222, the central axis of the extension rod 224 and the central axis of the connection portion 24, are located on the same plumb line L, so that the hanging point 2220 of the hook rod 222 and the gravity center of the filter body 40 are located on the same plumb line L. The hanging point 2220 refers to a contact position of the catching ring of the catcher with the hook lever 222 when the filter is recovered by the catcher. Since the hanging point 2220 is located on the weight line of the center of gravity of the recyclable filter 100, the recyclable filter 100 does not swing and unhook when the recyclable filter 100 is pulled by the recycling hook 20, and the catching ring can smoothly pull the recycling hook 20 and the filter body 40 into the recycling sheath.

In other embodiments, the hook bar 222 may be provided with a positioning groove at the hanging point 2220 for positioning the catch ring, the positioning groove having a width equal to or slightly greater than the diameter of the catch ring. When the catching ring slides to the hanging point 2220, the catching ring is clamped into the positioning groove to prevent the catching ring from falling out.

As shown in fig. 2 and 3, in the present embodiment, the outer shapes of the hook-shaped rod 222 and the extension rod 224 form the hook shape, the axial distance from the free end of the hook-shaped rod 222 to the proximal end of the connecting portion 24 is the axial opening dimension b of the hook shape, and the distance from the two ends of the arc-shaped segment, i.e., the hook-shaped rod 222, is the minimum opening dimension a of the hook shape. The minimum hook opening dimension a determines whether the capture loop can smoothly enter the hook stem 222 and whether the capture loop can remain stable after entering. If a is too small, the catch ring is difficult to enter the hook stem 222; if a is too large, the catch ring is likely to slip off after entering the hook stem 222. In order to make the catching ring easily enter and catch the hook shaft 222 and not easily slip out of the hook shaft 222, the minimum opening size a of the hook shape is preferably set to 0.5 to 1mm, and a can be adjusted according to the diameter size of the cable used for making the catching ring.

The size of the hook-shaped axial opening dimension b determines whether the catch ring can smoothly enter the minimum opening of the hook-shape along the extension rod 224. If b is too small, the capture ring will not easily enter the smallest opening of the hook along the extension rod 224; if b is too large, the longer the recovery part 22 is, the more the influence on other tissues or blood vessels in the human body is. In order to ensure that the catching ring of the catcher can smoothly enter the hook-shaped minimum opening along the extension rod 224 during recovery, it is preferable that the hook-shaped axial opening dimension b is at least 2 times the hook-shaped minimum opening dimension a, and in order to avoid adverse effects caused by an excessively long recovery section 22, the hook-shaped axial opening dimension b is set to be 4 times or less of the hook-shaped minimum opening dimension a, that is, the hook-shaped axial opening dimension b is 2 to 4 times the hook-shaped minimum opening dimension a. Therefore, if a is 0.5 to 1mm, b is 1 to 4 mm.

Further, a smooth lead-in section 2224 is disposed between the hook rod 222 and the extension rod 224, and the lead-in section 2224 extends obliquely from the proximal end of the extension rod 224 to the hook rod 222. The lead-in section 2224 is configured to facilitate guiding the capture ring along the lead-in section 2224 through the smallest opening of the hook shape and into the hook stem 222.

Fig. 5 and 6 are schematic views illustrating the recovery hook 20 of the first embodiment being fixedly connected to another type of strainer body 40 a. The filter body 40a is an umbrella-type filter body formed by cutting integrally, and the filter body 40a includes a plurality of struts 442 and a gathering portion 42 a. The converging portion 42a is a sleeve with struts 442 extending and diverging from a distal surface of the sleeve. When the recovery hook 20 and the filter body 40a are fixed, the connecting portion 24 is inserted into the gathered portion 42a, the welding portion 50 is formed by continuously welding at least one turn of the outer circumferential wall of the gathered portion 42a around the circumferential direction by laser, and the gathered portion 42a and the connecting portion 24 are welded together; alternatively, a plurality of welding portions 50 are formed by intermittently welding the outer peripheral wall of the gathered portion 42a around the circumferential direction by laser, the plurality of welding portions 50 are formed in at least one circle, and each welding portion 50 fuses the gathered portion 42a and the connection portion 24 together. The welding-affected zone has a small effect on the collecting portion 22 at the gathered portion 42a and the connecting portion 24.

As shown in fig. 7, when the filter is recovered by the catching ring 201 of the catcher 200, the catching ring 201 is passed through the smallest opening of the hook shape into the hook rod 222 along the extension rod 224 and the lead-in section 2224. When the filter is caught and recovered, because the hanging point 2220 of the catching ring 201 contacted with the recovery part 22, namely the force application point of the catching, the central axis of the extension rod 224 and the central axis of the connecting part 24 are positioned on the same weight line L, the hanging point 2220 and the gravity center of the filter body 40a are ensured to be on the same weight line, the filter body 40a can not cause the recovery hook 20 to swing and unhook due to the deflection of the gravity center, and the recovery blocking caused by the inclination of the filter is also avoided.

Referring to fig. 8-11, the recyclable filter according to the second embodiment of the present invention has a structure similar to that of the first embodiment, except that: the structure of the recovery hook 20a of the recoverable filter in the second embodiment is slightly different from that of the first embodiment, as follows:

in the second embodiment, the recovery hook 20a also includes a recovery part 22 having a hook shape and a connection part 24 provided at one end of the recovery part 22 and integrated with the recovery part 22, and the recovery part 22 includes a hook rod 222 and an extension rod 224 connected between the hook rod 222 and the connection part 24. The guide table 25 is arranged at the joint of the extension rod 224 and the connecting part 24, and the cross-sectional area of the guide table 25 perpendicular to the axial direction is gradually increased from one end close to the extension rod 224 to one end close to the connecting part 24. The guide table 25 provides a good guidance for the catching ring 201 of the catch 200 through the smallest opening of the hook into the hook shank 222.

The guide platform may be a frustum, a prism platform, etc. as shown in fig. 9, in this embodiment, the guide platform 25 is a frustum comprising a distal platform 251 connected to the proximal end of the connecting portion 24 and a proximal platform 253 connected to the extension rod 224, preferably, the cone angle of the frustum is in the range of 30 ° to 90 °, more preferably, the cone angle of the frustum is 60 ° to obtain the optimal guiding performance. When the recovery hook 20a is fixed to the strainer body, the distal end face 251 of the frustum abuts against the gathering portion 42a, i.e., the proximal end face of the sleeve. The diameter of the distal mesa 251 is equal to or slightly smaller than the outer diameter of the gathering portion 42a, and the diameter of the proximal mesa 253 is equal to the diameter of the extension rod 224.

In this second embodiment, the outer shapes of the hook bar 222, the extension bar 224 and the guide table 25 form the hook shape, the axial distance from the free end of the hook bar 222 to the proximal end of the connecting portion 24 is the hook-shaped axial opening dimension b, the distance from the arc-shaped section, i.e., the two ends of the hook bar 222, is the hook-shaped minimum opening dimension a, and similarly, in order to ensure that the catching ring of the catcher can smoothly enter the hook-shaped minimum opening along the guide table 25 and the extension bar 224 and avoid the adverse effect caused by the overlong recovery portion 22, the hook-shaped axial opening dimension b is 2 to 4 times the hook-shaped minimum opening dimension a.

As shown in fig. 11, when the collection hook 20a is fixedly connected to the filter body 40a, the connection portion 24 is inserted into the inner cavity of the sleeve, which is the gathering portion 42a, the distal end land 251 of the guide table 25 abuts against the proximal end surface of the gathering portion 42a, and the outer peripheral wall of the gathering portion 42a is continuously welded by laser light in the circumferential direction to form at least one welding portion 50, or the outer peripheral wall of the gathering portion 42a is intermittently welded by laser light in the circumferential direction to form a plurality of welding portions 50 spaced apart from each other, so that the outer peripheral wall of the connection portion 24 is fixedly connected to the inner peripheral wall of the gathering portion 42a, and the welding area between the connection portion 24 and the gathering portion 42a is. Furthermore, the recovery part 22 and the filter body 40a form a smooth transition through the guide table 25, which has a guiding function for the capture ring to enter the hook bar 222, thereby helping the capture ring to enter the hook bar 222 quickly and smoothly, and reducing the damage of the proximal end of the gathering part 42a to the blood vessel when the filter body 40a moves in the blood vessel.

Referring to fig. 12-13, a third embodiment of the present invention provides a recyclable filter having a structure similar to that of the first embodiment, except that: the structure of the recovery hook 20b of the recoverable filter of the third embodiment is slightly different from that of the first embodiment, specifically as follows:

in the third embodiment, the recovery hook 20b also includes a recovery part 22 having a hook shape and a connection part 24b provided at one end of the recovery part 22 and integrated with the recovery part 22, the recovery part 22 includes a hook rod 222 and an extension rod 224 connected between the hook rod 222 and the connection part 24b, the outer diameter of the connection part 24b is larger than the diameter of the extension rod 224, and the outer diameter of the connection part 24b is larger than the outer diameter of the gathering part 42 of the strainer body, i.e., the sleeve.

In this embodiment, the connecting portion 24b is a cylindrical connecting cylinder, the recovery portion 22 and the connecting portion 24b are integrally formed, the proximal end of the connecting portion 24b is closed and connected to the recovery portion 22, the inner diameter of the connecting portion 24b is equal to or slightly larger than the outer diameter of the gathering portion 42, and the gathering portion 42, i.e., a sleeve, is inserted into the connecting portion 24 b. The outer circumferential wall of the connecting portion 24b is continuously welded by laser to form at least one welding portion 50 in the circumferential direction, or the outer circumferential wall of the connecting portion 24b is intermittently welded by laser to form a plurality of welding portions 50 at intervals in the circumferential direction, so that the inner circumferential wall of the connecting portion 24b is fixedly connected to the outer circumferential wall of the gathered portion 42 in the circumferential direction, and the welding area between the connecting portion 24b and the gathered portion 42 is large.

In other embodiments, the edges of the proximal end face of the connection portion 24b may be rounded to reduce trauma of the proximal end of the connection portion 24b to the blood vessel as the filter moves within the blood vessel.

Referring to fig. 14-15, a recyclable filter according to a fourth embodiment of the present invention has a structure similar to that of the first embodiment, except that: the structure of the recovery part 22c of the recovery hook 20c of the recoverable filter of the fourth embodiment differs from that of the first embodiment, specifically as follows:

in the fourth embodiment, the recovery part 22c has a cylindrical structure or a cylindrical structure, the recovery part 22c is provided coaxially with the connection part 24, the diameter of the recovery part 22c is equal to or larger than the diameter of the connection part 24 (when the connection part 24 is in a cylindrical shape and is inserted into the gathered part 42, the diameter of the recovery part 22c is larger than the diameter of the connection part 24; when the connection part is in a cylindrical shape and the gathered part is inserted into the connection part, the diameter of the recovery part 22c is equal to the diameter of the connection part), and the recovery part 22c is provided with the hook groove 26 to form the hook shape. When the filter is recovered, the catching ring enters the hook groove 26, and the catching conduit connected with the catching ring is withdrawn to drive the catching ring and the recoverable filter to be collected into the recovering sheath.

Preferably, the diameter of the recovery portion 22c is equal to the outer diameter of the gathering portion 42, i.e. the sleeve, i.e. the outer peripheral surface of the recovery portion 22c is flush with the outer peripheral surface of the gathering portion 42 after the connecting portion 24 is fixedly connected with the gathering portion 42.

In the present embodiment, the hook groove 26 is opened at the middle position of the recovery portion 22c, the hook groove 26 extends obliquely toward the proximal end of the recovery portion 22c, and both opposite sides of the hook groove 26 penetrate the outer peripheral surface of the recovery portion 22 c.

Specifically, the hook groove 26 includes an arc-shaped inner surface 262 and a guide surface 264 extending from the outer circumference of the recovery portion 22c to the arc-shaped inner surface 262, the arc-shaped inner surface 262 corresponds to the arc segment, and the guide surface 264 is tangent to the arc-shaped inner surface 262, so that the guide surface 264 and the arc-shaped inner surface 262 are smoothly transited. The arcuate inner surface 262 is distal from the opening 260 of the hook slot 26 and the guide surface 264 is located on a side of the arcuate inner surface 262 adjacent the connecting portion 24.

The circle center corresponding to the arc-shaped inner surface 262 and the central axis of the connecting part 24 are located on the same heavy bob line, so that the recyclable filter does not swing or get unhooked in the process of pulling the recyclable filter by the catching ring.

When the recyclable filter is recovered, the catching ring slides along the guide surface 264 into the hook groove 26. To ensure that the guide surface 264 has a good guiding property. Preferably, the angle α between the guide surface 264 and the central axis of the recovery part 22c is 20 ° to 45 °.

The edges of the proximal end surface of the retrieval portion 22c may be rounded and the edges of the hook groove 26 may be rounded to reduce damage to the blood vessel caused by the proximal end surface of the retrieval portion 22c and the edges of the hook groove 26 as the filter moves within the blood vessel.

Referring to fig. 16 to 17, a recyclable filter according to a fifth embodiment of the present invention has a structure similar to that of the fourth embodiment, except that: the structure of the recovery part 22d of the recovery hook 20d of the fifth embodiment is different from that of the fourth embodiment, and specifically, the following is:

the recovery part 20d also includes a connection part 24 and a recovery part 22d integrally connected to the proximal end of the connection part 24, the recovery part 22d includes a cylindrical extension rod 271 and a hook rod 273 disposed at one end of the extension rod 271 far away from the connection part 24, and the cross-sectional shape of the recovery part 22d perpendicular to the axial direction gradually transits from square to round from the proximal end to the distal end. The extension rod 271 and the connecting portion 24 are coaxially arranged, the diameter of the extension rod 271 is larger than that of the connecting portion 24, and the diameter of the extension rod 271 is equal to the outer diameter of the gathering portion 42, i.e., the sleeve.

A first guide surface 2731 is arranged in the hook rod of the recovery part 22d, and the first guide surface 2731 is an inwards concave arc surface; second guide surfaces 2733 are disposed on both sides of the first guide surface 2731, respectively.

As shown in FIG. 16, the hooking rod 273 includes an axial connecting segment 2737 connected to the proximal end of the extension rod 271, a radial connecting segment 2733 disposed at the proximal end of the axial connecting segment 2737, and a return segment 2735 disposed at the distal end of the radial connecting segment 2733 and extending axially toward the extension rod 271. The extension rod 271, axial connector 2737, radial connector 2733 and return connector 2735 enclose a hook slot 274 having an opening 273 to form the hook shape. The first guiding surface 2731 is disposed inside the opening 274, and the connection between the axial connecting section 2737 and the extension rod 271 is disposed at two opposite sides of the opening 273, and each second guiding surface 2733 is disposed, and each second guiding surface 2733 extends obliquely towards the proximal end. First and second guide surfaces 2731 and 2733 provide a guide to guide the capture ring of the capture into the hook slot 274 smoothly.

Preferably, in order to ensure that the first guide surface 2731 has excellent guiding performance, an included angle β between a tangent line of the first guide surface 2731 at the intersection with the central axis of the extension rod 271 and the central axis of the extension rod 271 is 20 ° to 45 °.

The inner surface of the radial connecting section 2733 corresponds to the arc-shaped section, and the center of the arc-shaped section, the central axis of the extension rod 217 and the central axis of the connecting part 24 are located on the same weight line, so that the lifting point of the recovery hook 20d and the gravity center of the filter body are located on the same weight line, and the phenomenon of swinging and unhooking in the filter recovery process is prevented.

In this fifth embodiment, the axial distance from the free end of the folded section 2735 to the free end of the first guide surface 2731 is the hook-shaped axial opening dimension b, the distance from the two ends of the inner surface of the radial connecting section 2733 is the hook-shaped minimum opening dimension a, and the hook-shaped axial opening dimension b is 2-4 times the hook-shaped minimum opening dimension a, so as to ensure that the catching ring of the catcher can smoothly enter the hook-shaped minimum opening along the guide surface 2731 and avoid the adverse effect caused by the overlong recovery part 22 d.

Referring to fig. 18 to 20, a recyclable filter according to a sixth embodiment of the present invention has a structure similar to that of the fourth embodiment, except that: the structure of the recovery hook 20e of the sixth embodiment is different from that of the fourth embodiment, and specifically, the following is provided:

the recovery hook 20e in the sixth embodiment is a cylindrical structure, the distal end of the recovery part 22e of which is the connection part 24e, and a hook groove 26e is opened in the middle of the cylindrical structure to form the hook shape. When the filter is recovered, the catching ring enters the hook groove 26e, and then the catching conduit connected with the catching ring is withdrawn to drive the catching ring and the filter to be collected into the recovery sheath.

As shown in fig. 20, the gathering portion 42 of the filter body is a sleeve for gathering the ends of the filter portion 44, i.e., the plurality of struts 442, the inner diameter of the connecting portion 24e is equal to or slightly larger than the outer diameter of the sleeve, and the gathering portion 42 is inserted into the connecting portion 24 e. The outer circumferential wall of the connecting portion 24e is continuously welded by laser to form at least one welding portion 50 in the circumferential direction, or the outer circumferential wall of the connecting portion 24e is intermittently welded by laser to form a plurality of welding portions 50 at intervals in the circumferential direction, so that the inner circumferential wall of the connecting portion 24e is fixedly connected to the outer circumferential wall of the gathered portion 42 in the circumferential direction, and the welding area between the connecting portion 24e and the gathered portion 42 is large.

In the present embodiment, the hook groove 26e extends obliquely toward the proximal end of the recovery portion 22e, and opposite sides of the hook groove 26e penetrate the outer peripheral surface of the recovery portion 22 e. Specifically, the hook groove 26e includes an arc-shaped inner surface 262e and a guide surface 264e extending from the outer circumference of the recovery portion 22e to the arc-shaped inner surface 262e, the arc-shaped inner surface 262e corresponds to the arc segment, and the guide surface 264e is tangent to the arc-shaped inner surface 262e, so that the guide surface 264e and the arc-shaped inner surface 262e are smoothly transited. The arc-shaped inner surface 262e is away from the opening 260e of the hook groove 26e, and the guide surface 264e is located on the side of the arc-shaped inner surface 262e adjacent to the connecting portion 24 e. When the recyclable filter is recovered, the catching ring slides along the guide surface 264e into the hook groove 26 e. The circle center corresponding to the arc-shaped inner surface 262e and the central axis of the connecting part 24e are located on the same heavy bob line, so that the recyclable filter does not swing or unhook and the like in the process of pulling the recyclable filter by the catching ring.

In other embodiments, the outer and inner peripheral edges of the proximal face of the retrieval portion 22e of the cylindrical configuration are rounded to reduce trauma of the proximal end of the retrieval portion 22e to the blood vessel as the filter is moved within the blood vessel.

The foregoing is illustrative of embodiments of the present invention, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the embodiments of the present invention and are intended to be within the scope of the present invention.

Claims (16)

1. The utility model provides a retrieve hook for the filter body of the recoverable filter of pulling, the filter body includes at least one and gathers together the portion, its characterized in that, retrieve the hook including have hooked recovery portion and integral type set up in the connecting portion of recovery portion one end, connecting portion with gather together the portion and alternate each other and wind circumference fixed connection along the axial.

2. The recovery hook according to claim 1, wherein the connection portion is cylindrical or tubular, the filter body includes a filter portion formed by a plurality of struts, the gathering portion includes a sleeve for gathering ends of the struts, the connection portion is inserted into the sleeve in an axial direction or the sleeve is inserted into the connection portion in an axial direction, and an outer circumferential wall of the connection portion is fixedly connected to an inner circumferential wall of the sleeve or the inner circumferential wall of the connection portion is fixedly connected to an outer circumferential wall of the sleeve in a circumferential direction.

3. The recycling hook according to claim 2, wherein the sleeve and the filtering portion are separated or integrated, and the sleeve is fixedly sleeved on one end where the plurality of supporting rods converge.

4. The hook as claimed in claim 2 or 3, wherein the retrieving portion comprises at least one arc segment, and the center of the arc segment and the central axis of the connecting portion are located on the same weight line.

5. The recovery hook in accordance with claim 4, wherein the range of the central angle of the arcuate section is 90 ° to 270 °.

6. The recovery hook according to claim 4, wherein the recovery portion comprises a hook rod and an extension rod connected between the hook rod and the connection portion, and a cross-sectional area of the connection portion perpendicular to the axial direction is larger than a cross-sectional area of the extension rod perpendicular to the axial direction.

7. The recovery hook as claimed in claim 6, wherein the hook rod corresponds to the arc-shaped section, and the center of the arc-shaped section, the central axis of the extension rod and the central axis of the connection portion are located on the same weight line.

8. The retrieval hook of claim 6, wherein a smooth lead-in section is provided between the hook stem and the extension stem, the lead-in section extending obliquely from the extension stem proximal end to the hook stem.

9. The recycling hook according to claim 6, wherein a guide platform is disposed at a connection position of the extension rod and the connecting portion, and a cross-sectional area of the guide platform perpendicular to an axial direction is gradually increased from an end close to the extension rod to an end close to the connecting portion.

10. The retrieval hook of claim 9, wherein the guide table is a frustum, the guide table including a distal table surface connected to the connection portion and a proximal table surface connected to the extension rod, the distal table surface abutting a proximal end face of the sleeve.

11. The recovery hook according to claim 4, wherein the recovery portion has a cylindrical structure or a cylindrical structure, the recovery portion is disposed coaxially with the connection portion, the diameter of the recovery portion is greater than or equal to the diameter of the connection portion, and the recovery portion is provided with a hook groove to form the hook shape.

12. The recovery hook of claim 11, wherein the hook groove includes an arcuate inner surface corresponding to the arcuate section and a guide surface extending from the outer peripheral surface of the recovery portion toward the arcuate inner surface, the guide surface being tangential to the arcuate inner surface.

13. The retrieval hook of claim 4, wherein the cross-sectional shape of the retrieval portion perpendicular to the axial direction gradually transitions from square to circular from the proximal end to the distal end.

14. The recovery hook of claim 13, wherein a first guide surface is provided in the hook shape, the first guide surface being a concave arc surface; and second guide surfaces are respectively arranged on two sides of the first guide surface.

15. The recovery hook of claim 1, wherein the hook shape has an axial opening dimension that is 2-4 times the smallest opening dimension of the hook shape.

16. A recyclable strainer, comprising a strainer body and a recovery hook according to any of claims 1 to 15, wherein the strainer body comprises at least one gathering portion, and the connecting portion and the gathering portion are axially inserted into each other and fixedly connected around the circumference.

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