CN120053167A

CN120053167A - Support conveying device and support conveying system

Info

Publication number: CN120053167A
Application number: CN202510236121.4A
Authority: CN
Inventors: 苏世星
Original assignee: Anhui Jiaying Medical Instrument Co ltd
Current assignee: Anhui Jiaying Medical Instrument Co ltd
Priority date: 2025-02-28
Filing date: 2025-02-28
Publication date: 2025-05-30

Abstract

The invention relates to a bracket conveying device which comprises a pushing wire, an assembling section, a reducing section and a main body section, wherein the assembling section, the reducing section and the main body section are sequentially arranged from a far end to a near end, the wire diameter of the main body section is larger than that of the assembling section, one end of the reducing section connected with the main body section is identical to that of the main body section, one end of the reducing section connected with the assembling section is identical to that of the assembling section, the wire diameter of the reducing section is gradually reduced from the near end to the far end, one end of the assembling section close to the far end is provided with a far end spring, a release recovery pipe comprises a fixed part and a movable part, the fixed part is arranged on the assembling section, one end of the movable part is arranged on the outer surface of the fixed part, the other end of the movable part is in a flaring shape, both ends of the fixed part are provided with movable parts, a first developing ring and a second developing ring are arranged on the assembling section, the first developing ring is positioned at one end of the fixed part close to the far end, and the second developing ring is positioned in the fixed part. The invention also relates to a stent delivery system.

Description

Support conveying device and support conveying system

Technical Field

The invention relates to the technical field of stent conveying apparatuses, in particular to a stent conveying device and a stent conveying system.

Background

The implantation of stents or drug stents in blood vessels is one of the main treatments of vascular diseases. In the current process of implanting the stent into a blood vessel, the stent is usually clamped by adopting the cooperation of the catheter sheath and the pushing controller, and the catheter sheath, the stent and the pushing controller form a sandwich structure to generate enough friction force so as to realize the purpose of distally conveying the stent. The friction force needs to be overcome in the process of releasing and recovering the stent, the pushing controller can bear force along with the movement of the pushing controller to the far end or the near end, if the pushing controller is directly sleeved on the pushing guide wire, the pushing controller can rotate or slide, and when the stent enters the microcatheter, the pushing controller can not complete the process of conveying the stent into the microcatheter because of extrusion expansion.

The existing push controller has the following defects:

1. the requirement on the dimensional accuracy fit among the catheter sheath, the stent and the pushing controller is high, and the existing pushing controller is easy to cause the unloading of the stent when the stent is recovered.

2. The existing pushing controller is provided with the pushing block, so that the bending performance of the pushing controller is reduced, the hardness and friction force of the pushing controller are increased, but the inner wall of a blood vessel can be scratched in the stent conveying process, and thrombus is formed.

3. In order to increase the compliance of the pushing controller in the blood vessel, the end, close to the distal end, of the pushing controller is usually ground, but the phenomenon that the external spring on the pushing controller is eccentric easily occurs in the machining process, the machining qualification rate of the pushing controller is reduced, and meanwhile, the eccentric phenomenon of the pushing controller causes that the pushing controller cannot be normally pushed in the microcatheter.

4. The stent is in a compressed state in the catheter sheath for a long time, the braided wires or rod stents of the stent may be interwoven together, and when the stent is released, the head end of the stent may not be able to expand in time.

Disclosure of Invention

The invention provides a bracket conveying device and a bracket conveying system, which are used for solving the technical problems that the existing pushing controller is low in precision and friction and is easy to cause the off-load of a bracket.

The invention discloses a support conveying device which comprises a pushing wire, a release recovery pipe, a first developing ring and a second developing ring, wherein an assembly section, a reducing section and a main body section are sequentially arranged on the pushing wire from a far end to a near end, the wire diameter of the main body section is larger than that of the assembly section, one end of the reducing section connected with the main body section is identical to that of the main body section, one end of the reducing section connected with the assembly section is identical to that of the assembly section, the wire diameter of the reducing section gradually decreases from the near end to the far end, a far end spring is arranged at one end of the assembly section, the release recovery pipe comprises a fixed part and a movable part, the fixed part is arranged on the assembly section, one end of the movable part is arranged on the outer surface of the fixed part, the other end of the movable part is in a flaring shape, the movable parts are arranged at two ends of the fixed part, the first developing ring and the second developing ring are arranged on the assembly section, the first developing ring and the second developing ring are arranged on the first developing ring and the second developing ring and are positioned in the fixed part or near the first developing ring and near the fixed part.

Further, the support conveying device further comprises a flexible spring, the flexible spring is sleeved on the pushing wire, one end of the flexible spring is arranged at the joint of the main body section and the reducing section, the other end of the flexible spring is located at the first developing ring, and the flexible spring is sleeved on the first developing ring.

Further, a buffer section is arranged at the position of the assembly section close to the distal spring.

Further, the outer diameter of one end of the movable part far away from the fixed part is 1.5 mm-7.0 mm.

Further, a plurality of notches are formed at one end of the movable portion away from the fixed portion.

Further, the length of the movable portion is shorter than the length of the fixed portion.

Further, the bracket conveying device further comprises a developing part, and the developing part is arranged between the fixed part and the movable part.

Further, a notch for accommodating the movable part is formed in the fixed part.

Further, a groove is formed in the notch, and the support conveying device further comprises a developing piece which is arranged in the groove.

Further, a plurality of groups of protruding points are arranged on the inner wall of the movable part, the protruding points are sequentially arranged at intervals from the far end to the near end, and each group of protruding points comprises a plurality of protruding points which are uniformly distributed around the axis of the movable part.

Further, a chamfer is arranged on the inner wall of the movable part, and the chamfer is located at one end, far away from the fixed part, of the movable part.

Further, when the release recovery pipe is in a compressed state, the movable part is attached to the fixed part, and the section shape of the attaching surface between the movable part and the fixed part is a straight line or a wavy line.

Furthermore, the release recovery pipe is made of flexible materials, and the flexible materials are made of any one or more materials selected from silica gel and TPU, PET, pebax.

The invention discloses a stent delivery system, which comprises the stent delivery device as described in any one of the above, wherein the stent delivery device is slidably arranged in the lumen of a catheter sheath.

The stent conveying device and the stent conveying system provided by the invention can realize the following technical effects:

In the prior art, the release mark, the recovery mark and the complete release mark are integrally formed with the pushing guide wire, so that the outer diameters of the release mark, the recovery mark and the complete release mark are all fixed sizes, the size matching requirements among the pushing guide wire, the bracket and the catheter sheath are high, and the bracket is easily unloaded due to insufficient friction force.

Compared with the prior art, in the embodiment, the first developing ring, the second developing ring and the release recovery pipe are arranged on the assembly section, and the release recovery pipe is limited and fixed through the cooperation of the first developing ring and the second developing ring. When the support conveying device disclosed by the embodiment is used, the support conveying device is arranged in the lumen of the catheter sheath, the release recovery pipe made of flexible materials can be matched with the catheter sheath in a self-adaptive manner to clamp the support, the requirement on precision is reduced, the friction force among the catheter sheath, the support and the support conveying device is improved, the support conveying device is guaranteed to have enough supporting force to achieve the purpose of conveying the support, and the risk of unloading the support is reduced. The end of the stent delivery device proximal to the distal end is movable along the lumen.

In the process that the stent conveying device drives the stent to move to the distal end, the movable part on the release recovery tube, which is close to the distal end, moves to the proximal end and is elastically deformed due to the friction force, so that the outer diameter of the movable part on the release recovery tube, which is close to the distal end, is increased, the friction force is increased, and the stent conveying device and the catheter sheath further enhance the clamping force of the stent along with the increase of the friction force, so that the risk of unloading the stent is reduced, and the release of the stent is facilitated.

In the process that the stent conveying device drives the stent to move towards the proximal end, the movable part on the release recovery tube, which is close to the proximal end, moves towards the distal end due to friction force and is elastically deformed, so that the outer diameter of the movable part on the release recovery tube, which is close to the proximal end, is increased, friction force is increased, and along with the increase of friction force, the stent conveying device and the catheter sheath further strengthen the clamping force of the stent, the risk of unloading the stent is reduced, and the release of the stent is facilitated.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the invention.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which:

FIG. 1 is a schematic view of one embodiment of a stent delivery device of the present invention;

FIG. 2 is a schematic view of one embodiment of a release recovery tube of a stent delivery device of the present invention;

FIG. 3 is a schematic cross-sectional view of one embodiment of a release recovery tube of a stent delivery device of the present invention;

FIG. 4 is a schematic partial cross-sectional view of one embodiment of a stent delivery device of the present invention;

FIG. 5 is a partial schematic view of an embodiment of a pusher wire of a stent delivery device of the present invention;

FIG. 6 is a background art diagram;

FIG. 7 is a schematic illustration in partial cross-section of one embodiment of a stent delivery device of the present invention;

FIG. 8 is a schematic representation in partial cross-section of one embodiment of a stent delivery device of the present invention;

FIG. 9 is a schematic partial cross-sectional view of one embodiment of a release recovery tube of a stent delivery device of the present invention;

FIG. 10 is a schematic illustration in partial cross-section of one embodiment of a release recovery tube of a stent delivery device of the present invention;

FIG. 11 is a schematic illustration in partial cross-section of one embodiment of a stent delivery device of the present invention;

FIG. 12 is a partial schematic view of one embodiment of a securing portion of a stent delivery device of the present invention;

FIG. 13 is a schematic view in partial cross-section of one embodiment of a stent delivery device of the present invention;

FIG. 14 is a partial schematic view of a second embodiment of a securing portion of a stent delivery device of the present invention;

Fig. 15 is a schematic cross-sectional view of one embodiment of a stent delivery system of the present invention.

Reference numerals:

1. Push wire, 11, main body section, 12, reducing section, 13, assembly section, 14, buffer section, 2, release recovery tube, 21, fixed part, 211, notch, 212, groove, 22, movable part, 221, movable sub-part, 222, chamfer, 23, notch, 24, assembly groove, 25, space interlayer, 26, bump, 27, annular groove, 31, first developing ring, 32, second developing ring, 33, distal spring, 34, flexible spring, 35, developing piece, 4, catheter sheath, 41, lumen, 5, bracket.

Detailed Description

For a more complete understanding of the nature and the technical content of the embodiments of the present invention, reference should be made to the following detailed description of embodiments of the invention, taken in conjunction with the accompanying drawings, which are meant to be illustrative only and not limiting of the embodiments of the invention. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of embodiments of the invention and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the invention herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present invention, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate the azimuth or the positional relationship based on the azimuth or the positional relationship shown in the drawings. These terms are only used to facilitate a better description of embodiments of the invention and their examples and are not intended to limit the scope of the indicated devices, elements or components to the particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in embodiments of the present invention will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, the term "coupled" may be a fixed connection, a removable connection, or a unitary construction, may be a mechanical connection, or an electrical connection, may be a direct connection, or may be an indirect connection via an intermediary, or may be an internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.

The term "plurality" means two or more, and "plurality" means two or more.

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

In the present invention, the distal end means an end far from the operator at the time of surgery, and the proximal end means an end near the operator at the time of surgery.

First embodiment

As shown in fig. 1, the stent conveying device according to the present embodiment includes a pushing wire 1, a release recovery tube 2, a first developing ring 31, and a second developing ring 32, wherein the pushing wire 1 includes a main body section 11, a reducing section 12, and an assembling section 13, the reducing section 12, and the main body section 11 are sequentially disposed from a distal end to a proximal end, and the assembling section 13, the reducing section 12, and the main body section 11 are integrally formed to form the pushing wire 1. The wire diameter of the main body section 11 is larger than that of the assembly section 13, the reducing section 12 is positioned between the main body section 11 and the assembly section 13, the wire diameter of one end of the reducing section 12 connected with the main body section 11 is the same as that of the main body section 11, the wire diameter of one end of the reducing section 12 connected with the assembly section 13 is the same as that of the assembly section 13, and the wire diameter of the reducing section 12 gradually decreases from the proximal end to the distal end. The reducing section 12 can have a transition effect on the wire diameter of the main body section 11 and the wire diameter of the fitting section 13. Such an arrangement not only ensures that the stent delivery device has sufficient structural strength, but also facilitates delivery of the stent to a more distal location within the vessel.

As shown in fig. 1, a distal spring 33 is disposed at one end of the assembly section 13 near the distal end, the distal spring 33 is sleeved at one end of the assembly section 13 near the distal end, one end of the distal spring 33 is fixedly connected with one end of the assembly section 13 near the distal end, and a round head is disposed at the other end of the distal spring 33, so that damage to the inner wall of a blood vessel in the process of delivering the stent 5 is prevented. The release recovery pipe 2 is arranged on the assembly section 13, the first developing ring 31 and the second developing ring 32 are arranged on the assembly section 13, and the release recovery pipe 2 is fixed through the first developing ring 31 and the second developing ring 32.

As shown in fig. 1 to 3, the release recovery tube 2 includes a fixed portion 21 and a movable portion 22, the fixed portion 21 and the movable portion 22 are both tubular, the fixed portion 21 is disposed on the assembly section 13, and the movable portion 22 is sleeved on the fixed portion 21, specifically, one end of the movable portion 22 is fixed on the outer surface of the fixed portion 21, the other end of the movable portion 22 is flared, that is, one end of the movable portion 22 away from the fixed portion 21 is flared, and the value range of the outer diameter R of one end of the movable portion 22, which is flared, is 1.5mm to 7.0mm. The two ends of the fixed part 21 are provided with movable parts 22, and the two movable parts 22 are of symmetrical structures. The fixed portion 21 and the movable portion 22 of the release recovery tube 2 may be made of flexible materials. The flexible material can be any one of silica gel and TPU, PET, pebax. Of course, the flexible material can be formed by mixing a plurality of materials selected from silica gel and TPU, PET, pebax. The wall thickness of the fixed part 21 is thicker than that of the movable part 22, so that the fixed part 21 is convenient to fix, elastic deformation is facilitated when the movable part 22 is extruded, and friction force for releasing the recovery pipe 2 is increased.

Of course, as shown in fig. 3, the fixed portion 21 may further be provided with a plurality of movable portions 22, and a part of the plurality of movable portions 22 is disposed at one end of the fixed portion 21 and sequentially spaced along the axis of the fixed portion 21, and another part of the plurality of movable portions 22 is disposed at the other end of the fixed portion 21 and sequentially spaced along the axis of the fixed portion 21. Such an arrangement reduces the probability of failure of the release recovery tube 2, and when one of the movable portions 22 fails and cannot be opened, normal use of the release recovery tube 2 is not affected.

The specific arrangement scheme of the first developing ring 31 and the second developing ring 32 is as follows:

Optionally, as shown in fig. 1 and fig. 2, the first developing ring 31 and the second developing ring 32 are both disposed on the assembly section 13, and the first developing ring 31 and the second developing ring 32 may be made of any developing material of platinum tungsten, platinum iridium and tantalum, so that the operator can observe the position of releasing the recovery tube 2 in the operation process. In order to further clarify the connection relationship among the release recovery tube 2, the first developing ring 31 and the second developing ring 32, it is described that the release recovery tube 2 is in a compressed state, and when the release recovery tube 2 is in a compressed state, the outer diameter of the first developing ring 31 is the same as the outer diameter of the movable portion 22, the outer diameter of the first developing ring 31 is larger than the outer diameter of the second developing ring 32, and the outer diameter of the second developing ring 32 is larger than the outer diameter of the fixed portion 21 and is simultaneously smaller than the outer diameter of the movable portion 22. The first developing ring 31 is located at one end of the fixing portion 21 near the proximal end, the second developing ring 32 is located at one end of the fixing portion 21 near the distal end, and the release recovery tube 2 is fixed on the push wire 1 in a clamping manner through the first developing ring 31 and the second developing ring 32, so that the release recovery tube 2 can be prevented from slipping off the assembly section 13.

Optionally, as shown in fig. 2 and fig. 4, the first developing ring 31 and the second developing ring 32 are both disposed on the assembly section 13, and the first developing ring 31 and the second developing ring 32 may be made of any developing material of platinum tungsten, platinum iridium and tantalum, so that the operator can observe the position of releasing the recovery tube 2 in the operation process. In order to further clarify the connection relationship among the release recovery tube 2, the first developing ring 31 and the second developing ring 32, description will be made in terms of the release recovery tube 2 being in a compressed state, when the release recovery tube 2 is in a compressed state, the outer diameter of the first developing ring 31 is the same as the outer diameter of the movable portion 22, the outer diameter of the first developing ring 31 is larger than the outer diameter of the second developing ring 32, the outer diameter of the second developing ring 32 is larger than the inner diameter of the fixed portion 21, and the outer diameter of the second developing ring 32 is smaller than the outer diameter of the fixed portion 21. Accordingly, a groove for accommodating the second developing ring 32 is formed on the inner wall of the fixing portion 21, and when the release recovery pipe is mounted to the push wire 1, the second developing ring 32 on the push wire 1 is positioned in the groove of the fixing portion 21. The first developing ring 31 is located at an end of the fixing portion 21 near the proximal end, and the second developing ring 32 is located in the fixing portion 21 at a position in the middle of the fixing portion 21. The first developing ring 31 is located outside the release recovery tube 2 in a direction in which the fixing portion 21 is near the proximal end, so that the pushing force of the stent delivery device can be increased. The second developing ring 32 is disposed in the fixing portion 21, so that the risk of exposing the components to the outside is reduced. The fixation of the release recovery tube 2 is also completed by the cooperation of the first developing ring 31 and the second developing ring 32.

In this embodiment, one of the above-mentioned alternative solutions is optional.

Compared with the prior art, in the present embodiment, the first developing ring 31, the second developing ring 32 and the release recovery tube 2 are provided on the assembly section 13, and the release recovery tube 2 is limited and fixed by the cooperation of the first developing ring 31 and the second developing ring 32. When the support conveying device disclosed by the embodiment is used, the support conveying device is arranged in the lumen 41 of the catheter sheath 4, the release recovery pipe 2 made of flexible materials can be matched with the catheter sheath 4 in a self-adaptive manner to clamp the support 5, the requirement on precision is reduced, the friction force among the catheter sheath 4, the support 5 and the support conveying device is improved, the support conveying device is guaranteed to have enough supporting force to realize the purpose of conveying the support 5, and the risk of unloading the support 5 is reduced. The end of the stent delivery device proximal to the distal end may be moved along lumen 41.

In the process that the stent conveying device drives the stent 5 to move towards the distal end, the movable part 22 on the release recovery tube 2, which is close to the distal end, moves towards the proximal end and is elastically deformed due to the friction force, so that the outer diameter of the movable part 22 on the release recovery tube 2, which is close to the distal end, is increased, the friction force is increased, the stent conveying device and the catheter sheath 4 further enhance the clamping force of the stent 5 along with the increase of the friction force, the risk of unloading the stent 5 is reduced, the release of the stent 5 is facilitated, and the fish mouth effect caused by extrusion at one end, which is close to the proximal end, of the stent can be prevented.

In the process that the stent conveying device drives the stent 5 to move towards the proximal end, the movable part 22 on the release recovery tube 2, which is close to the proximal end, moves towards the distal end and is elastically deformed due to friction force, so that the outer diameter of the movable part 22 on the release recovery tube 2, which is close to the proximal end, is increased, friction force is increased, along with the increase of friction force, the stent conveying device and the catheter sheath 4 further enhance the clamping force of the stent 5, the risk of unloading the stent 5 is reduced, and the fish mouth effect caused by extrusion at one end, which is close to the proximal end, of the stent can be prevented.

Second embodiment

The embodiment also provides a stent conveying device. The second embodiment is a further improvement based on the first embodiment, and the main improvement is that the stent delivery device further comprises a flexible spring 34, wherein the flexible spring 34 is arranged on the pushing wire 1, and the following is specifically described:

Alternatively, as shown in fig. 1, the flexible spring 34 is sleeved on the pushing wire 1, and the flexible spring 34 covers the reducing section 12, the part assembly section 13 near the reducing section 12 and the first developing ring 31. One end of the flexible spring 34 is located at the connection position of the main body section 11 and the reducing section 12, and one end of the flexible spring 34 is fixedly connected to the connection position of the main body section 11 and the reducing section 12. Meanwhile, the flexible spring 34 is sleeved on the first developing ring 31, the other end of the flexible spring 34 is located at the first developing ring 31, and the other end of the flexible spring 34 is fixedly connected with the first developing ring 31. Through locating flexible spring 34 cover on pushing wire 1, and flexible spring 34 still overlaps on locating first developing ring 31, can also ensure the compliance of pushing wire 1 near the one end of distal end when strengthening the structural strength of assembly section 13. Meanwhile, the phenomenon that the flexible spring 34 is eccentric is avoided, and the coaxiality of the flexible spring 34 and the pushing wire 1 is improved.

Third embodiment

The embodiment also provides a stent conveying device. The third embodiment is a further improvement based on the first or second embodiment, and is specifically as follows:

Optionally, as shown in fig. 5, the assembly section 13 is further provided with a buffer section 14, and the buffer section 14 is located at a position of the assembly section 13 near the distal spring 33. The wire diameter of the buffer section 14 is the same as that of the fitting section 13, or the wire diameter of the buffer section 14 is smaller than that of the fitting section 13. By this arrangement, the stent delivery device is made somewhat flexible. Preferably, the buffer section 14 is wavy, and the stent delivery device in this embodiment is in a compressed state and in a straight line within the lumen 41 of the catheter sheath 4. When the stent delivery device of the present embodiment is pushed out from the lumen 41 of the catheter sheath 4, the binding of the catheter sheath 4 is lost, and the original wavy shape is restored. When the end of the stent close to the distal end generates a fish-mouth effect, the wavy buffer section 14 can be restored to effectively relieve the fish-mouth effect, so that the stent is convenient to release and stick to the vessel wall. During delivery of the stent 5 by the stent delivery device, when the stent 5 begins to be released, the buffer segment 14 begins to compress, making the head end of the stent 5 easier to release. At the same time, the buffer segment 14 may provide a buffer of displacement when the distal spring 33 abuts the inner wall of the vessel.

Fourth embodiment

The applicant has also found that in the prior art, the end of the push wire near the distal end has a relatively small diameter, which can easily cause a fish-mouth effect when passing through tortuous vessels or when releasing the stent 5. The stent is shown in fig. 6 in a state of being under a fish mouth effect (the fish mouth effect is a term of art well known to those skilled in the art).

The embodiment also provides a stent conveying device. The fourth embodiment is a further modification of any one of the first to third embodiments, in which a plurality of slits 23 are provided at an end of the movable portion 22 remote from the fixed portion 21, and the arrangement in which the plurality of slits 23 are provided with respect to the movable portion 22 is as follows:

Alternatively, as shown in fig. 2, a set of slits 23 is provided at an end of the movable portion 22 away from the fixed portion 21, the set of slits 23 including two slits 23, the two slits 23 being located on two sides of the axis of the movable portion 22, respectively, such that the set of slits 23 can form two movable sub-portions 221 at one end of the movable portion 22.

Alternatively, as shown in fig. 2, a set of slits 23 is provided at an end of the movable portion 22 remote from the fixed portion 21, the set of slits 23 including a plurality of slits 23, the plurality of slits 23 being uniformly arranged around the axis of the movable portion 22, such that the set of slits 23 can form a plurality of movable sub-portions 221 at an end of the movable portion 22.

Alternatively, a plurality of groups of slits 23 are provided at one end of the movable portion 22 away from the fixed portion 21, and the plurality of groups of slits 23 are provided at intervals in order from top to bottom in a direction perpendicular to the axis of the movable portion 22. Each set of slits 23 includes two slits 23, the two slits 23 being located on both sides of the axis of the movable portion 22, respectively, such that the plurality of sets of slits 23 can form a plurality of movable sub-portions 221 at one end of the movable portion 22.

Compared with the prior art, in the present embodiment, the movable portion 22 is provided with a plurality of movable sub-portions 221, and when the elastic force of one of the movable sub-portions 221 fails or malfunctions, the remaining movable sub-portions 221 can expand into a flared shape as they are. The stent delivery device disclosed in this embodiment has a plurality of active portions 221 of the active portion 22 each serving as a support when passing through a tortuous vessel, and can prevent the stent 5 from buckling or falling apart. Of course, if the tapered portion of the stent 5 formed at the catheter port of the catheter sheath 4 is not opened during the release of the stent 5, the plurality of active portions 221 can effectively spread the portion and also reduce the risk of the occurrence of the fish-mouth effect of the stent 5 at the time of release.

Fifth embodiment

The embodiment also provides a stent conveying device. The fifth embodiment is a further improvement based on the fourth embodiment, and the main improvement is that:

Alternatively, as shown in fig. 4, when the release recovery pipe 2 is in a compressed state, the inner wall of the movable portion 22 is fitted to the outer surface of the fixed portion 21, and at this time, the length of the movable portion 22 is shorter than the length of the fixed portion 21. This can increase the supporting force of the end of the movable portion 22 away from the fixed portion 21.

Optionally, as shown in fig. 7, a chamfer 222 is provided on the inner wall of the movable portion 22, where the chamfer 222 is located at an end of the movable portion 22 away from the fixed portion 21, and this is provided to better expand the end of the movable portion 22 away from the fixed portion 21, so as to support the bracket 5.

Alternatively, as shown in fig. 8, the thickness of the end of the movable portion 22 connected to the fixed portion 21 is thicker than the thickness of the end of the movable portion 22 distant from the fixed portion 21, and the thickness of the movable portion 22 gradually decreases from the end of the movable portion 22 connected to the fixed portion 21 to the end of the movable portion 22 distant from the fixed portion 21. This can improve the supporting force of the end of the movable portion 22 away from the fixed portion 21.

Alternatively, as shown in fig. 1, 9 and 10, the stent delivery device further includes a developing member 35, and the developing member 35 may be a developing spring or a developing ring made of any one of platinum tungsten, platinum iridium and tantalum. The developing member 35 is disposed between the fixed portion 21 and the movable portion 22, specifically, the outer surface of the fixed portion 21 is provided with an assembling groove 24, correspondingly, the inner wall of the movable portion 22 is also provided with an assembling groove 24, the developing member 35 is firstly disposed in the assembling groove 24 of the fixed portion 21, and simultaneously the fixed portion 21 is bound to the push wire 1, then the movable portion 22 is sleeved on the fixed portion 21, and the inner wall of one end of the movable portion 22 is in contact with and fixed to the outer surface of the fixed portion 21, so that the developing member 35 is also disposed in the assembling groove 24 of the movable portion 22 to perform a limiting function and a fixing function on the movable portion 22. At the same time, it is also convenient for the operator to observe the position of the developing member 35 during the operation.

In this embodiment, one of the above-mentioned alternative solutions is optional. Of course, the above alternative solutions may also be combined with each other.

Sixth embodiment

The embodiment also provides a stent conveying device. The sixth embodiment is a further improvement based on the fifth embodiment, and the main improvement is that the cross-sectional shape of the contact surface between the movable portion 22 and the fixed portion 21 is specifically:

Alternatively, as shown in fig. 4, the movable portion 22 is integrally formed with the fixed portion 21 to form the release recovery tube 2. When the release recovery pipe 2 is in a compressed state, one end of the movable portion 22 away from the fixed portion 21 is fitted to the fixed portion 21, that is, the inner wall of the movable portion 22 is fitted to the outer surface of the fixed portion 21. When the movable portion 22 is attached to the fixed portion 21, the cross-sectional shape of the attaching surface between the movable portion 22 and the fixed portion 21 is a straight line.

Alternatively, as shown in fig. 11, the movable portion 22 is integrally formed with the fixed portion 21 to form the release recovery tube 2. When the release recovery pipe 2 is in a compressed state, one end of the movable portion 22 away from the fixed portion 21 is fitted to the fixed portion 21, that is, the inner wall of the movable portion 22 is fitted to the outer surface of the fixed portion 21. When the movable portion 22 is attached to the fixed portion 21, the cross-sectional shape of the attaching surface between the movable portion 22 and the fixed portion 21 is a wavy line. This can improve the supporting force of the end of the movable portion 22 away from the fixed portion 21.

Either of the above two alternative solutions is optional.

Seventh embodiment

The embodiment also provides a stent conveying device. The seventh embodiment is a further improvement based on the fourth embodiment, and the main improvement is that:

Alternatively, as shown in fig. 12 and 13, the movable portion 22 and the fixed portion 21 are integrally formed to form the release recovery tube 2. The fixed portion 21 is provided with a notch 211, and the notch 211 is used for accommodating the movable portion 22. When the release recovery tube 2 is in a compressed state, a space interlayer 25 is formed between the end of the movable portion 22 away from the fixed portion 21 and the notch 211 of the fixed portion 21. Such an arrangement improves the supporting force of the movable portion 22, and more facilitates the expansion of the movable sub-portion 221 of the movable portion 22 and the support of the bracket 5.

Optionally, as shown in fig. 12 and fig. 13, the stent conveying device further comprises a developing member 35, and the developing member 35 may be a developing spring or a developing ring made of any developing material of platinum tungsten, platinum iridium and tantalum. Specifically, the fixing portion 21 has a groove 212, and the groove 212 is located in the notch 211 of the fixing portion 21. The developing member 35 is disposed in the recess 212. This not only restrains the fixing portion 21 to the push wire 1, but also facilitates the operator to observe the position of the developing member 35 during the operation. Of course, this alternative solution can also be combined with the alternative solution in which the second developing ring 32 is disposed in the fixing portion 21 in the first embodiment, so that the second developing ring 32 disposed in the fixing portion 21 supports the fixing portion 21, and the developing members 35 disposed in the grooves 212 at both ends of the fixing portion 21 bind the developing members 35, which can function like binding wires when making sausage, and can make the release recovery tube 2 more stably fixed on the assembly section 13 of the push wire 1.

Optionally, as shown in fig. 2, 12 and 13, as a further improvement on the above-mentioned alternative technical solutions, a plurality of groups of bumps 26 are provided on the inner wall of the movable portion 22, so that, for explaining the technical solution of providing a plurality of groups of bumps 26 on the movable portion 22, the description is made when the recovery tube 2 is in a compressed state, a plurality of movable portions 221 of the movable portion 22 are enclosed into a tubular shape, the movable portion 22 having a tubular shape is coaxially disposed with the fixed portion 21, the bumps 26 are hemispherical, the plurality of groups of bumps 26 are sequentially disposed at intervals from the distal end to the proximal end, and each group of bumps 26 includes a plurality of bumps 26 uniformly disposed around the axis of the movable portion 22. For example, two movable sub-portions 221 are disposed at one end of the movable portion 22, three sets of bumps 26 are disposed on the movable portion 22, each set of bumps 26 includes four bumps 26, the three sets of bumps 26 are sequentially disposed at intervals from the distal end to the proximal end, one half bump 26 of the three sets of bumps 26 is disposed on the inner wall of one movable sub-portion 221, the other half bump 26 of the three sets of bumps 26 is disposed on the inner wall of the other movable sub-portion 221, and when the recovery tube 2 is in a compressed state, the movable portion 22 is tubular in a compressed state, and in each set of bumps 26, the four bumps 26 are uniformly disposed around the axis of the movable portion 22. Such an arrangement can improve the elasticity of the movable portion 221, thereby improving the supporting force of the end of the movable portion 22 remote from the fixed portion 21.

Optionally, as shown in fig. 12 and 14, further modified on the basis of the above alternative technical solutions, the outer surface of the fixing portion 21 has a plurality of annular grooves 27, and the plurality of annular grooves 27 are disposed perpendicular to the axis of the fixing portion 21, or the plurality of annular grooves 27 are disposed obliquely to the axis of the fixing portion 21. The plurality of annular grooves 27 are uniformly distributed around the axis of the fixed portion 21. Such an arrangement can increase the passability of the release recovery tube 2, facilitating the bending of the release recovery tube 2.

Eighth embodiment

The present embodiment proposes a stent delivery system. A stent delivery system disclosed in an eighth embodiment includes the stent delivery device in any one of the first to seventh embodiments, specifically:

As shown in fig. 1 and 15, the delivery system includes a catheter sheath 4, and the catheter sheath 4 has a lumen 41 therein. The end of the stent delivery device near the distal end may be advanced into the lumen 41 of the catheter sheath 4 and moved proximally or distally within the lumen 41 to effect delivery of the stent 5. Specifically, the stent 5 is sleeved on the stent delivery device, and is covered on the release recovery tube 2, the second developing ring 32 and the partial assembly section 13, and is placed in the lumen 41 of the catheter sheath 4, and at this time, the stent 5 is in a compressed state. The stent 5 is conveyed by the friction force among the catheter sheath 4, the stent 5 and the stent conveying device. Distal movement of the stent delivery device at the distal end within lumen 41 effects release of stent 5. The stent 5 is retrieved by moving the end of the stent delivery device proximal to the distal end proximally within lumen 41.

The above description and the drawings illustrate embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiment of the present invention is not limited to the structure that has been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A stent delivery device, comprising:

The pushing wire is sequentially provided with an assembly section, a reducing section and a main body section from a far end to a near end, wherein the wire diameter of the main body section is larger than that of the assembly section, the wire diameter of one end, connected with the main body section, of the reducing section is identical to that of the main body section, the wire diameter of one end, connected with the assembly section, of the reducing section is identical to that of the assembly section, and the wire diameter of the reducing section gradually decreases from the near end to the far end;

The release recovery pipe comprises a fixed part and a movable part, wherein the fixed part is arranged on the assembly section, one end of the movable part is arranged on the outer surface of the fixed part, and the other end of the movable part is in a flaring shape;

the first developing ring and the second developing ring are arranged on the assembly section, the first developing ring is positioned at one end of the fixed part close to the proximal end, and the second developing ring is positioned at one end of the fixed part close to the distal end or positioned in the fixed part.

2. The stent delivery device of claim 1, further comprising:

The flexible spring is sleeved on the pushing wire, one end of the flexible spring is arranged at the joint of the main body section and the reducing section, the other end of the flexible spring is positioned at the first developing ring, and the flexible spring is sleeved on the first developing ring.

3. The stent delivery device of claim 2, wherein,

The assembly section is provided with a buffer section near the position of the distal spring.

4. A stent delivery device as claimed in any one of claims 1 to 3, wherein,

The outer diameter of one end of the movable part far away from the fixed part is 1.5 mm-7.0 mm.

5. The stent delivery device of claim 4, wherein,

The movable part is far away from one end of the fixed part and is provided with a plurality of notches.

6. The stent delivery device of claim 5 wherein,

The length of the movable part is shorter than that of the fixed part.

7. The stent delivery device of claim 5, further comprising:

And the developing part is arranged between the fixed part and the movable part.

8. The stent delivery device of claim 5 wherein,

The fixed part is provided with a notch for accommodating the movable part.

9. The stent delivery device of claim 8, wherein the notch has a groove disposed therein, the stent delivery device further comprising:

the developing piece is arranged in the groove.

10. The stent delivery device of claim 9, wherein,

The inner wall of the movable part is provided with a plurality of groups of protruding points, the protruding points are sequentially arranged at intervals from the far end to the near end, and each group of protruding points comprises a plurality of protruding points which are uniformly distributed around the axis of the movable part.

11. The stent delivery device of claim 5 wherein,

The inner wall of the movable part is provided with a chamfer, and the chamfer is positioned at one end of the movable part far away from the fixed part.

12. The stent delivery device of claim 5 wherein,

When the release recovery tube is in a compressed state,

The movable part is attached to the fixed part, and the section shape of the attaching surface between the movable part and the fixed part is a straight line or a wavy line.

13. The stent delivery device of claim 5 wherein,

The release recovery pipe is made of flexible materials;

the flexible material is formed by mixing any one or more materials of silica gel and TPU, PET, pebax.

14. A stent delivery system, comprising:

The stent delivery device of any of claims 1 to 13, wherein the stent delivery device is slidably disposed within a lumen of a catheter sheath.