CN217430270U - Conveying device - Google Patents

Abstract

The utility model discloses a conveying device, which comprises a conveying main body, wherein the far end of the conveying main body is provided with a loading part used for being jointed with a bracket, and the bracket is used for being arranged on the loading part; the loading portion comprises a telescopic support having at least a compressed configuration and a radially expanded configuration and being switchable between the compressed configuration and the radially expanded configuration; the telescopic supporting body is provided with a high polymer film, and the film can stretch along with the telescopic supporting body. By the arrangement, the conveying resistance of the stent can be reduced, the fluctuation of the conveying resistance is reduced, and the conveying safety is ensured.

Description

Conveying device

Technical Field

The utility model relates to the technical field of medical equipment, in particular to delivery support's conveyor.

Background

Intracranial aneurysms are mostly abnormal bulges on the wall of an intracranial artery, are the first causes of subarachnoid hemorrhage, and are second only to cerebral thrombosis and hypertensive cerebral hemorrhage in cerebrovascular accidents, and are the third cause. Intracranial aneurysms occur well in the basilar artery annulus (Willis's ring, commonly referred to as the cerebral artery annulus), with 80% occurring in the anterior half of the basilar artery annulus.

Current treatment of intracranial aneurysms has focused primarily on surgical clipping and intratumoral interventional embolization. In interventional embolization, the mainstream approaches are spring coil embolization and covered stents. The spring ring has large occupying effect of embolism, the neck opening of the tumor is easy to remain, and the large-sized aneurysm needs higher packing density and obviously compresses surrounding tissues; the covered stent is a balloon-expandable type at present, no self-expandable type covered stent is on the market at present, the flexibility of the balloon-expandable type covered stent is poorer than that of the self-expandable type covered stent, the in-place capability is not good, and the distal end lesion cannot be treated. In addition to the above intravascular interventions, dense mesh stent therapy is also used. The dense-mesh stent therapy usually adopts a weaving mode, improves the metal coverage rate to change the blood flow direction, promotes the blood retention and slow thrombosis in the aneurysm, promotes the hyperplasia of endothelial cells and neogenetic intimal tissues in the stent, and plays a role in repairing the parent artery after a certain period of time by means of the gradual intimation of the neck of the aneurysm, thereby achieving the purpose of curing the lesion. The current dense mesh stent is generally conveyed in a microcatheter by adopting a friction force mode, but when the stent is subjected to fluctuation in the microcatheter or passes through a tortuous lesion, the conveying resistance of the stent is suddenly increased, the fluctuation of the conveying resistance is large, and the unloading phenomenon is easy to occur. In addition, the same set of delivery device cannot be adapted to microcatheters of different sizes, different microcatheters need to be selected for stents of different sizes, the cost of the operation is increased, and the operation becomes complicated. In particular, existing stents are not easily released successfully, resulting in surgical failure and serious clinical accidents.

Therefore, there is a need for a novel delivery device for delivering a stent that solves one or more of the problems of the prior art delivery devices.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a conveyor aims at improving the security that the support was carried to reduce the support and carry the resistance, ensure to carry stability.

In order to achieve the above object, the present invention provides a conveying device, which includes a conveying main body, a distal end of the conveying main body being provided with a loading portion for engaging with a support, the support being arranged on the loading portion;

the loading portion comprises a telescopic support having at least a compressed configuration and a radially expanded configuration and being switchable between the compressed configuration and the radially expanded configuration;

the telescopic supporting body is provided with a polymer film, and the film can stretch along with the telescopic supporting body.

Optionally, the covering film is provided in at least one of the following ways:

is arranged on at least part of the inner surface of the telescopic support body;

is arranged on at least part of the outer surface of the telescopic support body; and the number of the first and second groups,

partially embedded in the collapsible support.

Optionally, the material of the cover film comprises one or more combinations of fluorinated ethylene propylene copolymer, polyoxymethylene, nylon, polyether block polyamide, polyimide, polyurethane, polyester and polyethylene.

Optionally, the telescopic support has an axial length no greater than the total axial length of the loading portion.

Optionally, at least one of the telescopic supports is disposed at the proximal end of the loading portion, or at least one of the telescopic supports is disposed at the proximal end of the loading portion, and at least one of the telescopic supports is disposed at the distal end of the loading portion.

Optionally, the number of the telescopic supports is multiple, and the telescopic supports are sequentially arranged along the axial direction of the loading part.

Optionally, a ratio of an axial length of the stretchable supporting body to an axial total length of the loading portion is not less than 0.02.

Optionally, the ratio of the axial length of the telescopic support body to the axial total length of the loading part is 0.02-0.1.

Optionally, the collapsible support is a self-expanding stent structure.

Optionally, the self-expanding stent structure is a single-layered stent structure or a multi-layered stent structure nested inside and outside.

Optionally, the stretchable support is a woven stent structure having a weave angle greater than or equal to 90 ° and less than 180 °.

Optionally, the braiding angle is 120 °.

Optionally, one of the proximal and distal ends of the telescopic support is movably connected to the delivery body and the other is fixedly connected to the delivery body.

Optionally, the near end of the telescopic support body is provided with a near end fixing member, the far end of the telescopic support body is provided with a far end fixing member, the near end fixing member and/or the far end fixing member can be developed, one of the near end fixing member and the far end fixing member is movably connected with the conveying main body, and the other one of the near end fixing member and the far end fixing member is fixedly connected with the conveying main body.

Optionally, the telescopic support after compression has a first outer diameter, and the telescopic support in a natural state has a second outer diameter, the first outer diameter is smaller than 0.43mm, and the second outer diameter is larger than 0.74 mm.

Optionally, the outer diameter of the collapsible support gradually decreases from the proximal end to the distal end.

Optionally, the delivery body comprises a proximal part and a distal part which are axially connected, the proximal part has the same outer diameter, and the outer diameter of the distal part decreases from the proximal end to the distal end; the collapsible support is disposed about a longitudinal axis of the distal portion, and the loading portion further includes a partial length of the distal portion exposed outside of the collapsible support.

Optionally, the proximal end of the distal portion is provided with a soft portion having a hardness less than that of the proximal portion.

Optionally, the most distal end of the delivery device is provided with a developing element.

In the conveying device disclosed by the utility model, the telescopic support body is adopted as the conveying element to convey the stent, on one hand, when the stent is conveyed in the microcatheter and fluctuates or suffers from tortuous lesions, the telescopic support body can be utilized to stretch out and draw back, the pressure to the stent is reduced, the conveying resistance is reduced, the stent is conveyed in place smoothly, the outer diameter of the telescopic support body can be adjusted at any time, the fluctuation of the conveying resistance is reduced, the conveying stability is improved, the manufacturing difficulty of the stent conveying device is reduced, on the other hand, after the stent is released, the insufficient part or the poor part of the adherent wall of the stent can be massaged or adjusted by utilizing the radial expansion of the telescopic support body, the sufficient opening or the better adherent wall of the stent is promoted, the expansion performance or the adherent performance of the stent is improved, in other words, the telescopic support body can provide extra outward radial force, the stent is expanded and kept in an expanded state, on the one hand, the stent can be conveyed in microcatheters with different sizes by utilizing the deformation of the telescopic support piece, so that the operation is more flexible and convenient, the operation cost is reduced, on the other hand, the polymer film is arranged on the telescopic support piece, when the stent is conveyed, the telescopic support piece and the film radially expand to be attached to the inner surface of the stent in a pressing and holding state, the outer surface of the stent is attached to the inner surface of the microcatheter, the polymer film can increase the friction force between the telescopic support piece and the inner wall of the stent, the stent is effectively prevented from falling off, the aims of better conveying the stent and recovering the stent are achieved, particularly, the polymer film can prevent a wave rod on the stent from extending into the telescopic support piece to cause the deformation of the stent or the stent cannot be separated from the telescopic support piece after the microcatheter is pushed out, causing serious clinical accidents, and therefore, the safety of the operation is higher.

The utility model discloses an among the conveyor, because the hardness of carrying the main part distal end can be increased to a certain extent in the setting of the telescopic supporter, can produce adverse effect to the bending performance, in order to ensure the bending performance of carrying the main part distal end, the axial length of telescopic supporter is preferred to be not more than the axial total length of loading portion.

The utility model discloses an among the conveyor, when the longer support is carried to needs, in order to avoid the adverse effect of telescopic support body axial length overlength to the bending performance, telescopic support body is preferably a plurality of independent settings, and a plurality of telescopic support body arrange along the axial of loading portion in proper order, if can separate the certain distance and arrange or be close to arranging, compare in the longer telescopic support body of integral type, the telescopic support body of a plurality of components of a whole that can function independently can promote the compliance of carrying the main part distal end, ensures the bending performance.

Drawings

The accompanying drawings are included to provide a better understanding of the present invention and are not intended to constitute an undue limitation on the invention. Wherein:

fig. 1 is a schematic overall structure diagram of a conveying device in a preferred embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the delivery device of FIG. 1;

fig. 3 is a schematic view of the overall structure of a conveying device in another preferred embodiment of the present invention.

In the figure: 1-a delivery body; 11-a proximal portion; 12-a distal portion; 2-a collapsible support; 21-a proximal fixation member; 22-a distal fixation member; 3, coating a film; 4-a soft part; 5-a loading section; 6-developing element.

Detailed Description

To make the objects, advantages and features of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

As used in this specification, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. The term "proximal" generally refers to the end of the delivery device that is near the operator; "distal" means the end of the delivery device that is distal to the operator, and that is first into the body. As used in this specification, the term "plurality" generally refers to at least two. In the present application, although the terms first, second, etc. may be used to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. The term "radial" generally refers to a direction perpendicular to the longitudinal axis of the delivery device; the term "axial" generally refers to a direction parallel to the longitudinal axis of the delivery device.

The utility model discloses a conveying device for implant of delivery support class. The stent-like implants to which the delivery device of the present disclosure is adapted to deliver may be selected based on the location of the target delivery site, for example, stents including, but not limited to, stent grafts, dense mesh stents for the treatment of intracranial aneurysms. It will be appreciated by those skilled in the art that the delivery device of the present disclosure may also be used to place other stents for applications, such as ureteral stents, prostate stents, peripheral stents, tracheobronchial stents, etc., into corresponding locations of the body. The stent may also be a graft, embolic device, occlusion device, or the like. Stents are generally tubular devices that are delivered to the vascular system of a patient by a delivery device. Stents can be used to treat a variety of different conditions, including stenosis and aneurysms.

The utility model discloses a support is including but not limited to from inflation formula support, also can be for not from inflation formula support. The self-expansion type stent reaches a lesion position in a press-holding type delivery mode, and self-expands after the micro catheter is pushed out; the non-self-expandable stent reaches the lesion position in a pressing and holding type delivery mode, and expands under the action of external force after being pushed out of the micro catheter. The expandable stent can be automatically expanded without the aid of an external tool; non-self-expanding stents require expansion by external tools such as balloons and the like.

The utility model discloses a conveying device, which comprises a conveying main body, wherein the far end of the conveying main body is provided with a loading part used for being jointed with a bracket, and the bracket is used for being arranged on the loading part; the loading portion comprises a telescopic support having at least a compressed configuration and a radially expanded configuration and being switchable between the compressed configuration and the radially expanded configuration; the telescopic supporting body is provided with a polymer film, and the film can stretch along with the telescopic supporting body. So construct, can reduce the support and carry resistance, also can reduce the fluctuation of carrying resistance, still can promote the expansibility or the adherence performance of support, can make same set of conveyor match the support simultaneously and carry in the little pipe of different sizes, especially prevent that the support drops the effect better, and especially, the operation security is higher.

It is to be understood that in some application scenarios, the loading portion further comprises a portion of the length of the delivery body, i.e. a portion of the length of the delivery body at its distal end is configured as a loading portion (i.e. stent crimping section). The delivery body may or may not extend axially through the collapsible support, but the proximal and distal ends of the collapsible support are connected to the delivery body, the collapsible support typically being disposed about the longitudinal axis of the delivery body.

The invention will be further described with reference to the accompanying drawings and preferred embodiments. In the following embodiments, features of the embodiments can be supplemented with each other or combined with each other without conflict.

Fig. 1 shows a delivery device provided by the preferred embodiment of the present invention, which includes a delivery main body 1, the delivery main body 1 is usually made of a metal core wire, the material of the metal core wire is a medical metal material, preferably a medical metal material with good elasticity, such as one or a mixture of multiple materials of nickel-titanium alloy, nitinol, stainless steel, cobalt-chromium alloy, and nickel-cobalt alloy.

The distal end of the delivery body 1 is provided with a loading portion 5 for engaging with a stent (not shown) which is pressed against the loading portion 5 during delivery, and the stent is fixed by the loading portion 5 to prevent the stent from falling off.

The loading part 5 comprises a telescopic support body 2; during stent delivery, the stent is crimped onto the telescopic support 2 and is held by the outward radial force of the telescopic support 2. Said "outward" is directed away from the longitudinal axis of the delivery body 1. As a preferred embodiment, the loading portion 5 further comprises a metal core wire, and the metal core wire constituting the loading portion 5 may be integrally connected with the metal core wire constituting the conveying body 1 or connected with the metal core wire constituting the conveying body 1 through the stretchable supporting body 2. When the metal core wires are integrally connected, the whole metal core wire axially penetrates through the telescopic support body 2, namely the metal core wire penetrates through the telescopic support body 2; when the metal core wires are connected through the telescopic supporting body 2, the metal core wires do not axially penetrate through the telescopic supporting body 2, namely, the metal core wires do not exist in the telescopic supporting body 2. Normally, the metal core wire is a continuous whole wire, and is used not only as the transport body 1 but also as a part of the loading section 5 and also for fitting the stretchable support body 2.

Preferably, the stent is crimped onto the wire of the loading portion 5 and also onto the telescopic support 2 of the loading portion 5, the wire being relatively soft and improving the overbending performance at the distal end.

The telescopic support 2 has at least a compressed configuration and a radially expanded configuration and is switchable between said compressed configuration and said radially expanded configuration. Therefore, when in conveying, the telescopic support body 2 can generate radial and outward radial force to the stent, the problem of unloading the stent in the conveying process can be avoided, the telescopic characteristic of the telescopic support body 2 can be utilized to reduce the conveying resistance, particularly the conveying resistance when the stent passes through tortuous lesions, when the size of a lumen or the size of a microcatheter is changed, the conveying resistance can be kept stable, particularly when the stent is released, the telescopic support body 2 can help the stent to be opened or be attached to the wall sufficiently, and the expansion performance or the adherence performance of the stent is improved.

The inventor found that, when the telescopic support body 2 is separately provided, since the telescopic support body 2 is generally made of a metal material, if the telescopic support body is directly contacted with the stent, the friction force between the stent and the telescopic support body 2 is small, and the friction force is small, the difficulty of delivering and recovering the stent is increased, and particularly, the wave rod on the stent is easy to extend into the telescopic support body 2, so that the stent is deformed, or the stent cannot be separated from the telescopic support body 2 after pushing out the microcatheter, so that the stent release failure is caused. In order to solve the technical problem, referring to fig. 1 and 2, the conveying device further includes a polymer film 3, and the film 3 is disposed on the stretchable support body 2 and can be stretched along with the stretchable support body 2.

The material of the coating 3 is a polymer material with a certain friction coefficient, and can cover at least part of the inner surface of the stretchable support body 2, or cover at least part of the outer surface of the stretchable support body 2, or cover at least part of the inner surface and at least part of the outer surface of the stretchable support body 2. Further, the cover film 3 may also be at least partially embedded in the collapsible support 2, and further, the cover film 3 embedded in the collapsible support 2 may also protrude out of the outer surface and/or the inner surface of the collapsible support 2, e.g. further covering the surface of the collapsible support 2 after protruding. Preferably, the cover film 3 covers the entire outer surface and/or the entire inner surface of the stretchable support 2. The material of the covering film 3 comprises one or more combinations of high polymer materials such as fluorinated ethylene propylene copolymer (FEP), Polyformaldehyde (POM), Nylon (Nylon), polyether block polyamide (Pebax), Polyimide (PI), Polyurethane (PU), polyester and Polyethylene (PE).

During delivery, the telescopic support body 2 and the film 3 expand together and are attached to the inner surface of the stent, the outer surface of the stent is attached to the inner surface of the microcatheter, and the film 3 can increase the friction force between the telescopic support body 2 and the inner wall of the stent and provide the force transmitted by the metal core wire to the stent under a compressed structure so as to achieve the purposes of delivering the stent and recovering the stent; in the process of releasing the stent, when the telescopic support body 2 is not completely unfolded, the stent can be recovered through the withdrawing conveying device; meanwhile, the film 3 covers the telescopic support body 2, so that the wave rod on the support is prevented from extending into the telescopic support body 2, the support is prevented from deforming or being incapable of being separated from the telescopic support body 2 after the micro-catheter is pushed out, and serious clinical accidents are caused.

In one embodiment, the conveying body 1 axially penetrates through the whole conveying device, at this time, the telescopic support body 2 is sleeved on the conveying body 1, and the conveying body 1 penetrates through the telescopic support body 2, that is, the metal core wire of the conveying body 1 penetrates through the telescopic support body 2. Typically, one of the proximal and distal ends of the telescopic support body 2 is movably connected to the transport body 1, and the other is fixedly connected to the transport body 1, so as to facilitate axial movement of one end to effect telescoping of the telescopic support body 2 on the transport body 1. In other embodiments, the delivery body 1 may be attached to only the proximal end of the loading portion 5, in which case the core wire of the delivery body 1 extends non-axially throughout the delivery device, while the loading portion 5 includes another core wire through which the loading portion 5 itself connects to the collapsible support body 2 and forms a stent crimping segment.

In a specific embodiment, the proximal end of the telescopic support body 2 is provided with a proximal fixing member 21, the distal end of the telescopic support body 2 is provided with a distal fixing member 22, and the proximal fixing member 21 and the distal fixing member 22 are both connected with the delivery body 1, wherein one of the proximal fixing member 21 and the distal fixing member 22 is movably connected with the delivery body 1, and the other one is fixedly connected with the delivery body 1. That is, the delivery body 1 and the telescopic support body 2 are fixed by one of the fixing members (e.g., the proximal fixing member 21 or the distal fixing member 22), and the telescopic support body 2 is axially moved relative to the delivery body 1 by the other fixing member.

Preferably, the proximal fixing member 21 and/or the distal fixing member 22 are capable of visualization, so that an operator can determine the telescopic state and position of the telescopic support body 2 based on the visualization of these structures under X-ray. The structure of the proximal fixing member 21 and the distal fixing member 22 is not limited, and may be, for example, a ring-shaped or spiral structure, so as to be sleeved on the metal core wire, thereby connecting the telescopic support body 2 and the conveying body 1 together, and if the proximal fixing member and the distal fixing member are fixedly connected, the manner of the fixed connection may be bonding, welding, or the like, and is not limited in particular. In addition, the imaging material for making the proximal fixing member 21 and/or the distal fixing member 22 is not limited, and may be one or more of a combination of radiopaque materials such as platinum, iridium, gold, silver, tantalum, and tungsten.

In this embodiment, the conveying body 1 axially penetrates the entire conveying device. For better overbending performance, the delivery body 1 is configured to include a proximal portion 11 and a distal portion 12 that are axially contiguous. As shown in fig. 3, the outer diameter of the proximal portion 11 is the same, and the outer diameter of the distal portion 12 decreases from the proximal end to the distal end, thereby ensuring good pushing performance at the proximal end and good bending performance at the distal end. And the portions of distal portion 12 that differ in outer diameter smoothly transition. The loading portion 5 is disposed on the distal end portion 12. In this embodiment, the conveying main body 1 (including the proximal portion 11 and the distal portion 12) is formed by integrally molding a reducing metal core wire, so that the outer diameters of the metal core wires of the distal portion 12 are sequentially reduced from the proximal end to the distal end, and the outer diameters of the metal core wires of the proximal portion 11 are the same, so that the conveying main body 1 is configured into the reducing metal core wire, and the reducing metal core wire is thinner at the distal end, which is beneficial to improving flexibility.

In a particular embodiment, the telescopic support 2 is disposed about the longitudinal axis of the distal section 12, and the telescopic support 2 exposes a portion of the length of the distal section 12, i.e. the telescopic support 2 does not completely cover the distal section 12, and the loading section 5 further comprises the portion of the length L1 of the distal section 12 exposed outside of the telescopic support 2, i.e. the loading section 5 further comprises a portion of the wire core (i.e. the portion of length L1) of the distal section 12. The distal portion 12 has an axial length of typically 400mm, which is adapted to the general anatomy of the blood vessel, so that the distal portion 12 can smoothly traverse tortuous lesions.

Preferably, the maximum outer diameter of the conveying body 1 is not more than 0.74mm and not less than 0.2mm, and at least one outer diameter is less than 0.15mm, and a tapered transition is formed between every two different outer diameters, and the length of the transition section can be less than or equal to 50 mm. Preferably, the outer surface of the delivery body 1 is coated with a coating that reduces the friction between it and the microcatheter, such as a hydrophilic coating, a lubricious coating, or the like.

In a preferred embodiment, the proximal end of the distal portion 12 is provided with a flexible portion 4, and the stiffness of the flexible portion 4 is less than the stiffness of the proximal portion 11. The metal core wire of the conveying body 1 may axially penetrate the flexible portion 4, or may not axially penetrate the flexible portion 4. It will be appreciated that when the core wire extends axially through the flexible portion 4, the flexible portion 4 is sheathed over the core wire forming the distal portion 12; when the metal core wire does not penetrate through the soft part 4 in the axial direction, no metal core wire penetrates through the soft part 4, and at the moment, the near end and the far end of the soft part 4 are respectively fixedly connected with the metal core wire.

The flexible portion 4 is more flexible than the proximal portion 11 to improve the overbending behavior of the distal portion 12. The specific structure type of the soft part 4 is not limited. For example, the flexible part 4 may be a cut hypotube, which is fixed to a metal core wire, and the outer surface of the hypotube may be coated with a hydrophilic coating or a lubricating coating or a friction-reducing polymer material. The pitch of the hypotube can be equidistant or variable, and the variable diameter mode is that the pitch is reduced from the near end to the far end, such as gradual reduction or step-by-step reduction or other reduction modes. The material of the hypotube can be stainless steel, nickel-titanium alloy, cobalt-chromium alloy or other common medical metal materials.

The flexible portion 4 may be a spring formed by winding a metal wire and fixed to the metal core wire, and the outer surface of the spring may be coated with a hydrophilic coating or a lubricating coating or a high polymer material for reducing friction. The outer diameters of the springs can be equal or variable, and the variable diameter mode is that the pitch is reduced from the near end to the far end, such as gradual reduction or step-by-step reduction or other reduction modes. The spring can be made of stainless steel, nickel-titanium alloy, cobalt-chromium alloy or other common medical metal materials.

Further, the telescopic support 2 after compression has a first outer diameter d1, and the telescopic support 2 in a natural state has a second outer diameter d 2; the compressed state is that the telescopic support body 2 can be compressed to the first outer diameter d1 when being applied with external force and can be naturally expanded to the second outer diameter d2 without being applied with external force, and d1 is smaller than d 2. The first outer diameter d1 is preferably less than 0.43mm and the second outer diameter d2 is preferably greater than 0.74mm, which substantially meet the delivery requirements of conventional microcatheter sizes, as well as the delivery requirements of most gauge stents.

Further, the outer diameter of the telescopic support body 2 is gradually reduced from the proximal end to the distal end. Here, the outer diameter of the stretchable supporting body 2 after compression is mainly referred to, but may be a radially expanded outer diameter. So set up, be favorable to reducing the hardness of the telescopic support body 2, promote the bending performance.

The expandable support body 2 is generally a mesh-like stent structure, and the forming manner is not limited, such as a cutting stent structure or a weaving stent structure, or consists of a plurality of wave bars arranged circumferentially. The collapsible support 2 may be a self-expanding stent structure or a non-self-expanding stent structure. In this example, the expandable stent 2 is a self-expandable stent structure and may be made of a super elastic material or a shape memory alloy material, such as nitinol. As a preferred embodiment, the telescopic support body 2 is a woven stent structure, which has good flexibility and can improve the bending performance of the far end of the conveying main body 1.

In this example, the telescopic support body 2 is a woven stent structure, which provides better flexibility to the telescopic support body 2, and it can be woven by single or multiple strands of woven wire. Preferably, the braided stent structure has a braiding angle of greater than or equal to 90 ° and less than 180 °, more preferably a braiding angle of 120 °, with strong radial support. The telescopic supporting body 2 can be a single-layer supporting structure or a multi-layer supporting structure nested inside and outside. The multilayer support structure has stronger supporting force and can better convey the support.

The shape of the stretchable supporting body 2 is not limited, and may be various shapes such as a cylindrical shape, a spindle shape, a tapered shape, a spherical shape, and a dumbbell shape. The telescopic support 2 may be of any desired shape, as long as it is capable of telescoping and exerting an outward radial force on the stent.

Since the arrangement of the telescopic support body 2 increases the distal stiffness to some extent, the axial length of the telescopic support body 2 is preferably not greater than the total axial length of the loading portion 5, thereby improving the bending performance of the distal end. Generally, the loading portion 5 includes a metal core wire partially exposed from the stretchable supporting body 2 in addition to the stretchable supporting body 2. The metal core wire may or may not axially penetrate the collapsible support 2.

Further, the ratio of the axial length of the telescopic support body 2 to the axial total length of the loading part 5 is not less than 0.02, and more preferably, the ratio of the axial length of the telescopic support body 2 to the axial total length of the loading part 5 is 0.02-0.1. The arrangement of the length ratios can effectively balance the radial support property and the bending property of the far end, thereby not only ensuring the conveying property of the stent, but also ensuring the bending property of the far end.

At least one telescopic support 2 is usually disposed at the proximal end of the loading portion 5 (i.e. the loading portion 5 includes at least one telescopic support 2 disposed at the proximal end thereof) so as to be close to the proximal end portion 11 of the delivery main body 1, and thus the configuration is capable of better transmitting the force on the proximal metal core wire to the telescopic support 2, thereby achieving the purpose of smoothly delivering and retrieving the stent. Alternatively, at least one telescopic support 2 is arranged at the proximal end of the loading portion 5 and at least one telescopic support 2 is arranged at the distal end of the loading portion 5. It is noted that the distal section 12 comprises a proximal flexible portion 4, and the loading portion 5 is disposed distal to the flexible portion 4, the loading portion 5 and the flexible portion 4 being in different positions on the distal section 12.

The stretchable supporting body 2 may be a single body continuously provided, or may be divided into a plurality of independent bodies. Multiple independent individuals may reduce the axial length compared to the entirety, thereby reducing distal stiffness to further improve overbending performance. For example, when the length of the stent to be delivered is long, if a whole long stretchable supporting body 2 is provided, the whole hardness is relatively high, and the hardness can be effectively reduced by dividing the whole long stretchable supporting body 2 into a plurality of short stretchable supporting bodies 2. Therefore, as shown in fig. 3, it is preferable that the number of the telescopic supports 2 is plural, and the plural telescopic supports 2 are arranged in sequence along the axial direction of the loading part 5, where the sequential arrangement may be arranged next to each other or arranged at a certain distance, and usually arranged at a certain distance, and the effect is better. The plurality of telescopic supports 2 may be distributed uniformly or non-uniformly, preferably uniformly.

To facilitate the operator's determination of the position of the distal end of the delivery device, a visualization element 6 is typically provided at the distal-most end of the delivery device, i.e., visualization element 6 is provided at the distal-most end of distal portion 12. The developing element 6 may be formed by spirally winding a spiral radiopaque wire, or may be formed by laser machining a spherical developing element at the distal end of the conveying body 1. The developing element 6 is capable of developing under X-rays, and the material is a conventional metal developing material.

The operation of the conveying device of the present invention will be further described with reference to the preferred embodiments.

When the stent is assembled, the stent is overlapped with the loading part 5 on the delivery main body 1 in the axial direction after being pressed and held, the inner surface of the stent is in direct contact with the telescopic supporting body 2, the telescopic supporting body 2 can automatically adjust the expansion outer diameter according to the inner diameter of the microcatheter so as to apply an outward radial self-expansion force on the stent, and then the stent is combined with the film 3 to drive the stent to be delivered along the microcatheter through frictional resistance. Because the telescopic support body 2 can be automatically adjusted in outer diameter when being subjected to different outer diameters or the outer diameters of the micro-catheters, the pressure of the support is not obviously changed, the friction resistance for driving the support to convey is not obviously changed, the requirement for conveying the support under different micro-catheters can be met, and the pushing resistance is stable.

In the using process, an operator drives the stent to move towards the far end along the micro catheter by pushing the near end of the conveying main body 1, when the developing element 6 at the far end of the conveying main body 1 is separated from the micro catheter, the stent is indicated to be released, the conveying main body 1 is continuously pushed, and the stent is slowly released; before the telescopic support body 2 is not pushed out of the micro catheter, the stent can be recovered by withdrawing the conveying main body 1, and the stent is continuously released after the position is readjusted; when the telescopic supporter 2 is completely pushed out of the micro-catheter, the stent is completely released. In particular, the expandable support body 2 can be used to massage or adjust the stent when the stent is not fully opened or adheres poorly, so that the stent can be fully opened or adheres well.

To sum up, the utility model discloses a conveyor utilizes the self-expanding characteristic of telescopic support body, makes conveyor be applicable to not unidimensional pipe a little, and the range of application is wide, and transportation process is more safe moreover to make conveyor keep less sectional area, accomplish the high degree of difficulty operation. Furthermore, adopt the utility model discloses a mode of carrying through the polymer friction pad in the past has been abandoned to conveyor, adopts novel telescopic support body as carrying the component, has solved the undulant great problem of carrying resistance fluctuation that causes of polymer friction pad size, has also overcome polymer friction pad elasticity poor and be difficult to control and carry the size, leads to polymer friction pad size required precision height, the problem that the processing degree of difficulty is big. Meanwhile, the self-adaptive adjustment of the telescopic support body can match the stent to be conveyed in the microcatheter with different sizes, and when the stent is conveyed in the microcatheter and encounters tortuous lesion to cause lumen bending (kink), the outer diameter can be adjusted according to the size of the lumen, the conveying resistance is reduced, and the stent is conveyed in place smoothly. Meanwhile, after the stent is released, the telescopic support body can be used for massaging or adjusting the part of the stent which is not fully opened, so that the stent is finally fully opened or adheres to the wall better.

The above description is only for the description of the preferred embodiment of the present invention, and not for any limitation of the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure all belong to the protection scope of the present invention.

Claims (18)

1. A delivery device comprising a delivery body having a distal end provided with a loading portion for engagement with a stent for disposition on the loading portion;

the loading portion comprises a telescopic support having at least a compressed configuration and a radially expanded configuration and being switchable between the compressed configuration and the radially expanded configuration;

the telescopic supporting body is provided with a polymer film, and the film can stretch along with the telescopic supporting body.

2. The delivery device of claim 1, wherein the covering is disposed in at least one of the following ways:

is arranged on at least part of the inner surface of the telescopic support body;

is arranged on at least part of the outer surface of the telescopic support body; and the number of the first and second groups,

partially embedded in the collapsible support.

3. The delivery device of claim 1 or 2, wherein the material of the cover film comprises one of fluorinated ethylene propylene copolymer, polyoxymethylene, nylon, polyether block polyamide, polyimide, polyurethane, polyester and polyethylene.

4. A conveyor device according to claim 1 or 2, wherein the telescopic support has an axial length not greater than the total axial length of the loading section.

5. The delivery device of claim 4, wherein at least one of the telescoping supports is disposed at a proximal end of the loading section, or wherein at least one of the telescoping supports is disposed at a proximal end of the loading section and at least one of the telescoping supports is disposed at a distal end of the loading section.

6. The conveying apparatus according to claim 4, wherein the number of the telescopic supports is plural, and plural telescopic supports are arranged in sequence in an axial direction of the loading section.

7. The transfer device of claim 4, wherein the ratio of the axial length of the telescopic support to the total axial length of the loading portion is not less than 0.02.

8. The conveying device as claimed in claim 7, wherein the ratio of the axial length of the telescopic support to the axial total length of the loading part is 0.02-0.1.

9. A delivery device according to claim 1 or 2, wherein the collapsible support is a self-expanding stent structure.

10. The delivery device of claim 9, wherein the self-expanding stent structure is a single-layered stent structure or a multi-layered stent structure nested inside and outside.

11. The delivery device of claim 9, wherein the telescoping support is a braided stent structure having a braid angle greater than or equal to 90 ° and less than 180 °.

12. The delivery device of claim 1 or 2, wherein one of the proximal and distal ends of the telescopic support is movably connected to the delivery body and the other is fixedly connected to the delivery body.

13. A delivery device according to claim 12, wherein the proximal end of the telescopic support is provided with a proximal mount and the distal end of the telescopic support is provided with a distal mount, the proximal mount and/or the distal mount being capable of visualization, one of the proximal mount and the distal mount being movably connected to the delivery body and the other being fixedly connected to the delivery body.

14. A transfer device according to claim 1 or 2, wherein the telescopic support after compression has a first outer diameter and the telescopic support in its natural state has a second outer diameter, the first outer diameter being smaller than 0.43mm and the second outer diameter being larger than 0.74 mm.

15. The delivery device of claim 1 or 2, wherein the outer diameter of the telescoping support decreases from the proximal end to the distal end.

16. The delivery device of claim 1 or 2, wherein the delivery body comprises a proximal portion and a distal portion that are axially contiguous, the proximal portion having the same outer diameter, and the distal portion having an outer diameter that decreases from the proximal end to the distal end; the telescoping support is disposed about the longitudinal axis of the distal portion and exposes a portion of the length of the distal portion, and the loading portion further includes a portion of the length of the distal portion exposed outside of the telescoping support.

17. The delivery device of claim 16, wherein the proximal end of the distal portion is provided with a soft portion having a hardness less than the hardness of the proximal portion.

18. A delivery device according to claim 1 or 2, wherein the most distal end of the delivery device is provided with a developer element.

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