CN115919399B

CN115919399B - Conveying wire with clamping jaws and bracket conveying system

Info

Publication number: CN115919399B
Application number: CN202211648089.3A
Authority: CN
Inventors: 崔亚飞; 叶嘉铭; 王格; 赵舒畅; 李思佳
Original assignee: Shanghai Li Kai Technology Co ltd
Current assignee: Shanghai Li Kai Technology Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2024-02-02
Anticipated expiration: 2042-12-21
Also published as: CN115919399A

Abstract

The application relates to a conveyor wire with jaws, comprising: carry silk and jack catch, wear to be equipped with the jack catch on the carry silk, the quantity of jack catch is more than two, the inside cavity of jack catch, and the jack catch has a plurality of claw hooks that extend towards the periphery. Through set up the jack catch on carrying the silk, the claw hook of jack catch extends towards carrying the periphery of silk, compares in traditional conveying system, claw hook can directly contact with the support of compression state, and this kind of support from the inside embedding compression state of support can realize the multiple spot pulling to the support through the claw hook of several. When pushing to the support distal end, the jack catch receives the axial force of carrying the silk, and the claw hook of its front end can outwards extend by a small margin, stretches out to the outside of hypotube from claw hook hole, and claw hook inwards extrudees the support from the periphery for the support stretches out in the lumen of sheath pipe, and the diameter of support has the trend of diminishing, and then reduces the frictional resistance between support and the sheath pipe, and the more easy implementation personnel in this field operate, shortens operation time, improves the operation success rate.

Description

Conveying wire with clamping jaws and bracket conveying system

Technical Field

The application relates to the technical field of medical equipment, in particular to a conveying wire with clamping jaws and a bracket conveying system.

Background

The dense net stent is generally selected to reconstruct blood flow for treating cerebral vascular hemorrhage or assist the stent to assist the spring ring embolism treatment, and the common operation strategy is to firstly establish a passage, then convey the stent or the spring ring and other instruments to the lesion site, push out the stent or the spring ring, block the lesion vascular aneurysm and complete the operation.

The auxiliary stent is used for assisting the coil embolic treatment, the requirement on the stent release accuracy is high, the stent has good enough supporting and adherence performance, and the stent needs to be pushed from outside the body and accurately released to a lesion part after being compressed into a sheath tube with a smaller diameter, so that a user can conveniently perform the coil embolic treatment of the next step. Therefore, the conveying system of the auxiliary bracket has higher requirements on the conveying resistance, the release flexibility and the release accuracy of the bracket.

In addition, when the performance of the self-conveying system also influences the operation convenience of the operator, the high performance can be realized, the conveying system capable of accurately and rapidly releasing the bracket can improve the operation experience of the operator, the total operation time is shortened, and the device plays a positive role in postoperative recovery of a patient.

Generally, a delivery system of a stent in the prior art is loaded in a sheath together with the stent, after the stent is pushed forward and pushed out of a microcatheter by forward pushing force of a pushing wire, the stent made of memory alloy is self-expanded under the action of human body temperature or is self-expanded and recovered by elasticity of the stent to be attached to a vessel wall, but in the pushing process of the stent, the self-expansion performance of the stent enables the stent to apply pressure to the vessel wall in the microcatheter, and the stent is clamped by a delivery rod, so that the delivery resistance of the stent is increased.

Disclosure of Invention

In view of this, the present application proposes a conveyor wire with jaws, comprising a conveyor wire and jaws; the conveying wire is provided with more than two clamping claws in a penetrating way; wherein the inside of the claw is hollow, and the claw has a plurality of claw hooks extending toward the outer circumference.

In one possible implementation manner, the clamping jaw is made of a developing material, and the clamping jaw further comprises a base;

the base is of a hollow cylinder structure, and the claw hook is arranged at one end of the base.

In one possible implementation, the radial projection of the claw hook is in a concave arc-shaped structure extending gradually outwards, and the outward end of the claw hook is perpendicular to the axial direction of the conveying wire.

In one possible implementation, the radial projection of the claw hook is "s" -shaped; the claw hook is provided with a bending section connected with the base and a parallel section connected to the outer end part of the bending section, and the parallel section is parallel to the conveying wire; the proximal end of the bending section and the axial direction of the conveying wire gradually tend to be parallel; the middle part of the bending section is of an arc-shaped structure and is smoothly connected with the proximal end of the bending section; the distal end of the bending section gradually tends to be parallel to the axial direction of the conveying wire, and is smoothly connected with the distal end of the bending section.

In one possible implementation, the delivery wire is a variable diameter delivery wire; the middle part of the conveying wire is provided with a reducing section, and the diameter length of the proximal end of the conveying wire is larger than that of the distal end of the conveying wire; the clamping jaw is fixedly arranged at one side of the conveying wire adjacent to the distal end.

In one possible implementation manner, each jaw is integrally formed, and the jaws are arranged at equal intervals along the axial direction of the conveying wire; the number of the claw hooks on each claw is 2-8, and the claw hooks are distributed at equal intervals in the circumferential direction of the same claw.

In another aspect, the present application further provides a stent delivery system, including a delivery wire with a claw, a hypotube, and a stent described in any one of the above implementations; the hypotube is provided with a claw hook hole and a groove; the number and the positions of the claw hook holes are corresponding to and matched with those of the claw hooks; the conveying wire with the claw is arranged in the hypotube in a penetrating way, and the claw hook extends out to the outer surface of the hypotube; the support is of a hollow cylinder structure, and the support is sleeved outside the hypotube and can be contacted with the claw hook.

In one possible implementation, the device further comprises a sheath tube sleeved outside the hypotube.

In one possible embodiment, the hypotube is adhesively or welded to the conveyor wire.

In one possible implementation, the claw hook hole is a round hole, and the aperture of the claw hook hole is in the range of 0.05mm-0.3 mm.

The beneficial effects of this application: through set up the jack catch on carrying the silk, and the claw hook of jack catch extends towards the periphery of carrying the silk, in the in-service use, compare in the tradition lean on the silica gel pipe or lean on the conveying system of propelling movement support proximal end, claw hook on the jack catch can directly contact with the support of compression state, and this kind of from the inside embedding compression state's of support, can realize the multiple spot pulling to the support through the claw hook of several.

Moreover, when pushing to the support distal end, the jack catch receives the axial force of carrying the silk, and the claw hook of its front end can continue outside little range extension, more partial claw hooks promptly, stretches out to the outside of hypotube from claw hook hole, and a plurality of claw hooks follow the radial force of periphery inwards this moment, extrusion support for the support stretches out in the lumen of sheath pipe, and the diameter of support has the trend of diminishing, and then reduces the frictional resistance between support and the sheath pipe, more easily the implementation personnel operation in this field, shortens operation time, improves the operation success rate.

Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the present application and together with the description, serve to explain the principles of the present application.

FIG. 1 illustrates a partial cross-sectional schematic view of a stent delivery system according to an embodiment of the present application;

FIG. 2 illustrates a partial cross-sectional schematic view of a stent delivery system according to another embodiment of the present application;

FIG. 3 illustrates a perspective view of a stent delivery system according to an embodiment of the present application;

FIG. 4 shows a schematic side view of a conveyor wire with jaws according to an embodiment of the present application;

FIG. 5 shows a schematic side view of a hypotube according to an embodiment of the present application;

FIG. 6 shows a schematic diagram of an assembly of a transmission wire with jaws with a hypotube according to an embodiment of the present application;

FIG. 7 shows a schematic cross-sectional view of a proximal end of a delivery wire in connection with a hypotube in accordance with an embodiment of the present application;

fig. 8 shows an isometric view of various stages in the preparation of the jaws of the embodiments of the present application.

Detailed Description

Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It should be understood, however, that the terms "center," "longitudinal," "transverse," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description or to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

In addition, numerous specific details are set forth in the following detailed description in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.

FIG. 1 illustrates a partial cross-sectional schematic view of a stent delivery system according to an embodiment of the present application; FIG. 2 illustrates a partial cross-sectional schematic view of a stent delivery system according to another embodiment of the present application; FIG. 3 illustrates a perspective view of a stent delivery system according to an embodiment of the present application; FIG. 4 shows a schematic side view of a conveyor wire with jaws according to an embodiment of the present application; FIG. 5 shows a schematic side view of a hypotube according to an embodiment of the present application; FIG. 6 shows a schematic diagram of an assembly of a transmission wire with jaws with a hypotube according to an embodiment of the present application; FIG. 7 shows a schematic cross-sectional view of a proximal end of a delivery wire in connection with a hypotube in accordance with an embodiment of the present application; fig. 8 shows an isometric view of various stages in the preparation of the jaws of the embodiments of the present application.

As shown in fig. 1-8, the conveyor wire 4 with jaws 2 comprises: the conveying wire 4 and the clamping jaw 2 are provided with more than two clamping jaws 2 in a penetrating mode, wherein the clamping jaws 2 are hollow, and the clamping jaws 2 are provided with a plurality of clamping hooks 22 extending towards the outer periphery.

In this embodiment, by providing the claw 2 on the conveying wire 4, and extending the claw hook 22 of the claw 2 toward the outer periphery of the conveying wire 4, in actual use, compared with a conventional conveying system by a silicone tube or by pushing the proximal end of the bracket 5, the claw hook 22 on the claw 2 can directly contact with the bracket 5 in a compressed state, and thus the bracket 5 in a compressed state is embedded from the inside of the bracket 5, and multi-point pulling of the bracket 5 can be realized by a plurality of claw hooks 22.

Moreover, when pushing to support 5 distal end, jack catch 2 receives the axial force of carrying silk 4, the axial length of support 5 obtains stretching extension in sheath 1 intracavity, the claw hook 22 of jack catch 2 front end can continue outside little range extension, more partial claw hooks 22 promptly, stretch out to the outside of hypotube 3 from claw hook 22 hole, a plurality of claw hooks 22 follow the radial force of periphery inwards this moment, also can extrude support 5, above-mentioned axial stretching to support 5, after radial extrusion action, the diameter of support 5 has the trend of diminishing, and then reduce the frictional resistance between support 5 and the sheath 1, more easily the implementation personnel operation in the art, shorten the operation time, improve the operation success rate.

It is also noted herein that for purposes of this application, the proximal end is that end proximal to the operator and the distal end is that end proximal to the patient; the outer side referred to herein is a spreading direction from the axis of the conveyance wire 4 to the outer periphery, and the inner side is an axis direction toward the conveyance wire 4.

In one embodiment, the claw 2 further comprises a base 21, the base 21 is in a hollow cylinder structure, and the claw 22 is arranged at one end of the base 21.

In this embodiment, the claw 2 includes two parts, namely a base 21 and a claw hook 22, and the base 21 is generally in the shape of a hollow cylinder, may be a square cylinder, or the like, and is not particularly limited, and only needs to ensure that the base 21 itself can be penetrated and fixed on the conveying wire 4 to achieve fixation. Preferably, the base 21 is a hollow cylindrical structure that is perforated along the axis of the cylinder.

More specifically, the claw hook 22 extends from the base 21 to the outer periphery thereof, and the claw hook 22 is preferably provided at one end of the base 21, and the claw hook 22 provided at one end of the base 21 is easier to process and can achieve better multi-point fixation with the bracket 5.

Preferably, the claw 2 is made of a metal material with developability, and the claw 2 is made of an integrated molding, as shown in fig. 8, fig. 8a is a metal pipe, as shown in fig. 8b, one end of the metal pipe is cut into a plurality of parts, the number of ends after cutting is the number of specific claws 22, and then the claw 2 is subjected to heat treatment pre-molding and polishing cleaning treatment to complete the structure of the claw 2 made of the integrated molding, wherein fig. 8c is only an example, the specific heat treatment molding structure is not unique, and only the claw 22 is required to be ensured to be contacted with the bracket 5 when in use, so that each claw 2 can complete multi-point fixing of the multi-bracket 5.

In one embodiment, the material of the claw 2 is a developing material.

As shown in fig. 1 and 3, in one embodiment, the radial projection of the claw 22 is in a concave arc-shaped configuration extending gradually outwardly, and the outward end of the claw 22 is perpendicular to the axial direction of the delivery wire 4.

In this embodiment, the claw hook 22 has a concave arc-shaped structure extending gradually outward from one end of the base 21, that is, the claw hook 22 has a structure that spreads in a flowering shape toward the outer periphery of the base 21.

As shown in fig. 2, in one embodiment, the radial projection of the claw hook 22 is s-shaped, wherein the claw hook 22 has a bending section connected to the base 21 and a parallel section connected to the outer end of the bending section, and the parallel section is parallel to the conveying wire 4, the proximal end of the bending section gradually tends to be parallel to the axial direction of the conveying wire 4, the middle part of the bending section is in an arc structure and is smoothly connected with the proximal end of the bending section, and the distal end of the bending section gradually tends to be parallel to the axial direction of the conveying wire 4 and is smoothly connected with the distal end of the bending section.

In this embodiment, the claw hook 22 is an s-shaped section, one end connected with the base 21 is a bending section, the bending section extends outwards, the other end of the bending section gradually tends to be parallel to the axis of the conveying wire 4, the parallel section is completely parallel to the axis of the conveying wire 4, the end of the final bending section, which tends to be parallel to the axis of the conveying wire 4, is smoothly connected with the parallel section, the inner side of the claw hook 22 can wrap the support 5 to a certain extent according to the claw hook 22 arranged in the structure, compared with the scheme in fig. 1 of the specification, the binding effect of the scheme in fig. 3 on the support 5 is better, when the distal end of the support 5 is just conveyed out of the sheath tube 1, the support 5 in a compressed state cannot be rebound in a blood vessel immediately due to the binding effect of the claw hook 22, so that the release position of the support 5 is more convenient for an operator in the field, the controllability of the conveying wire 4 with the claw hook 2 is improved, and the erroneous release of the support 5 or the operation which is further unfavorable for the operation progress is avoided.

In one embodiment, as shown in fig. 7, the delivery wire 4 is a tapered delivery wire 4, wherein a proximal portion of the delivery wire 4 has a tapered section, and the proximal diameter of the delivery wire 4 is longer than the distal diameter of the delivery wire 4, and the jaws 2 are fixedly disposed on a side of the delivery wire 4 adjacent the distal end.

In this embodiment, the reducing section of the reducing conveying wire 4 is disposed at the tail portion of the conveying wire 4, that is, near the proximal end side of the conveying wire 4, where the outer diameter of the proximal end of the conveying wire 4 is identical to the outer diameter of the hypotube 3, and the outer diameters of the conveying wires 4 in the reducing section are gradually reduced, and the positions are engaged with each other to complete the fixed connection, and usually, bonding or welding is adopted.

In one possible implementation manner, each claw 2 is integrally formed, the claws 2 are arranged at equal intervals along the axial direction of the conveying wire 4, the number of claw hooks 22 on each claw 2 is 2-8, and the claw hooks 22 are distributed at equal intervals in the circumferential direction of the same claw 2.

On the other hand, the application still provides a support conveying system, including the conveying wire 4 that has jack catch 2 in the above-mentioned arbitrary embodiment, hypotube 3 and support 5, hypotube 3 includes pipe main part 31 and the claw hook 22 hole and the recess 33 of seting up on it, claw hook 22 hole corresponds and matches with claw hook 22's quantity, position, the conveying wire 4 that has jack catch 2 wears to establish in hypotube main part 31, and claw hook 22 stretches out to the surface of hypotube main part 31, support 5 is the cavity cylinder structure, and support 5 cover is established outside hypotube 3, can contact with claw hook 22.

In this embodiment, the claws 2 extending towards the outer periphery are arranged on the conveying wire 4, the hypotube 3 with the claw 22 holes processed is sleeved on the outer layer of the conveying wire 4, the claw 22 of the claw 2 can extend out of the claw 22 holes of the hypotube 3 and can be used for conveying the stent 5, binding the stent 5 and the like, and the conveying wire 4 is provided with more than two claws 2, during the process of pushing the stent 5 towards the distal end simultaneously, the claws 2 are subjected to the axial force of the conveying wire 4, the axial length of the stent 5 is stretched and extended in the cavity of the sheath tube 1, the claw 22 at the front end of the claw 2 can continuously extend outwards to a small extent, namely, more parts of the claw 22 extend out of the claw 22 holes to the outer side of the hypotube 3, at this time, the plurality of claw 22 can also squeeze the stent 5 from the radial force inwards at the outer periphery, and the diameter of the stent 5 has a trend of reducing after the axial stretching and radial squeezing actions of the stent 5, and further friction resistance between the stent 5 and the sheath tube 1 is reduced. Further, after the stent 5 is pushed out of the sheath tube 1, the stent 5 can be continuously bound by a plurality of the claws 2 through the metal claw 2 shape designed as shown in fig. 3, and is not automatically released due to self-expansion, so that the position of the stent 5 can be accurately adjusted in a developing mode, the conveying wire 4 is independently retracted at a proper time, the claws 2 can be retracted into the hypotube 3 through the claw hook 22 holes of the hypotube 3, the stent 5 is not bound, and the stent 5 at a precise position can be expanded and released.

In one possible implementation, the device further comprises a sheath tube 1, wherein the sheath tube 1 is sleeved outside the hypotube 3.

The claws 2 are fixedly connected with the conveying wire 4 at the same distance on the conveying wire 4, the hypotube 33 cut by the slotting is sleeved outside the reducing conveying wire 4, the outer diameter of the proximal end of the conveying wire 4 is consistent with that of the hypotube 3, the two are connected at the clamping position in an adhesive or welding mode, as shown in fig. 7, the claw hooks 22 of the claws 2 extend out through the claw hook 22 holes on the hypotube 3 to divide the lumen of the sheath tube 1 into a plurality of small sections, the bracket 5 is arranged between the sheath tube 1 and the hypotube 3, and the metal wire or rod of the bracket 5 is limited in the region between the claw 2 and the lumen; in the whole pushing process, after the conveying wire 4 and the clamping claws 2 are driven to fix the sheath tube 1 by pushing the hypotube 33, the bracket 5 system is pushed forward by pushing the conveying wire 4 and the hypotube 3 to drive the clamping claws 2 fixed on the wire. Before the stent 5 is released, after the distal end portion loaded with the stent 5 is pushed out of the catheter, the stent 5 is released from the lumen constraint, and is opened and attached to the vessel wall by its self-expanding property, thereby completing the release of the stent 5.

In one embodiment, hypotube 3 is adhesively secured or welded to delivery wire 4.

It should also be understood that the hypotube 3 and the delivery wire 4 are provided with a hard connection (welded or bonded, and other portions are not connected) on the proximal side, and that the hypotube 3 has a groove 33 in the rear section, and that those skilled in the art can pinch the intermediate delivery wire 4 from the groove 33 to bend and pull it up, thereby allowing withdrawal of the delivery wire 4 without movement or deformation of the hypotube 3.

In one embodiment, the plurality of claws 2 are spaced at the same distance on the conveying wire 4 and are firmly connected on the conveying wire 4, the hypotube 3 cut by slotting is sleeved outside the conveying wire 4 and is connected in a near-end bonding or welding mode, the claws 22 of the claws 2 extend out through the claw 22 holes on the hypotube 3, the bracket 5 can be clamped and attached on the hypotube 3, and in the whole pushing process, after the sheath 1 is fixed, the pushing wire and the hypotube 3 in the slotting region are pushed forwards to jointly drive the plurality of claws 2 fixed on the conveying wire 4 to push the bracket 5 forwards. Before the stent 5 is released, after the distal end part loaded with the stent 5 is pushed out of the sheath tube 1, when the stent 5 is released, the hypotube 3 is fixed, the conveying wire 4 is lifted from the slotting position to the proximal end, and the claw 2 is driven to retract backwards and the claw hook 22 is retracted into the hypotube 3 due to the firm connection between the claw 2 and the conveying wire 4, so that the stent 5 can be opened and attached to the target vascular wall reliably due to the self-expanding performance.

In one embodiment, the aperture of the claw hook 22 is a circular aperture, and the aperture of the claw hook 22 aperture is in the range of 0.05mm to 0.3 mm.

In this embodiment, the hypotube 3 in the stent delivery system of the present application is a specialized hypotube 3 adapted to the delivery wire 4 with the claw 2, and the surface of the hypotube is provided with a plurality of claw 22 holes in the circumferential direction of equidistant positions of the hypotube 3 in addition to the conventionally provided grooves 33, and in general, the claw 22 holes of the same specification are adapted to the claw 22 holes of the same specification on the hypotube 3, and the aperture of the claw 22 holes is between 0.05mm and 0.3 mm.

The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A stent conveying system is characterized by comprising a conveying wire with clamping jaws, a hypotube and a stent;

the conveying wire with the clamping jaws comprises a conveying wire and clamping jaws;

the conveying wire is provided with more than two clamping claws in a penetrating way;

wherein the inside of the claw is hollow, and the claw is provided with a plurality of claw hooks extending towards the periphery and is suitable for being contacted with the bracket;

the conveying wire is a reducing conveying wire, the clamping jaw is fixedly arranged at one side position of the conveying wire, which is close to the far end, the clamping jaw is made of developing materials, and the clamping jaw further comprises a base;

the base is of a hollow cylinder structure, and the claw hook is arranged at one end of the base;

each claw is integrally formed;

specifically, one end of a metal pipe is cut into a plurality of parts, the number of the cut ends is the specific number of the claw hooks, and then the claw is subjected to heat treatment pre-shaping and polishing cleaning treatment to complete the integrally formed claw structure;

the radial projection of the claw hook is of a concave arc structure which gradually extends outwards, and the claw hook is of a flowering type diffusing structure towards the periphery of the base; and the outward end of the claw hook is perpendicular to the axial direction of the conveying wire;

the hypotube is provided with a claw hook hole and a groove;

the claw hook holes are round holes, and the number and the positions of the claw hook holes are corresponding to and matched with those of the claw hooks;

the conveying wire with the claw is arranged in the hypotube in a penetrating way, and the claw hook extends out to the outer surface of the hypotube;

the support is of a hollow cylinder structure, is sleeved outside the hypotube and can be contacted with the claw hook;

the reducing section of the reducing conveying wire is arranged at the tail part of the conveying wire and is close to one side of the proximal end of the conveying wire, the outer diameter of the proximal end of the conveying wire is consistent with that of the hypotube, the outer diameter of the conveying wire at the reducing section is gradually reduced, and the conveying wire and the hypotube are fixed at the clamping position through bonding or welding.

2. The stent delivery system of claim 1, further comprising a sheath tube, the sheath tube being sleeved outside of the hypotube.

3. The stent delivery system of any one of claims 1-2, wherein the claw hook aperture has a pore size in the range of 0.05mm to 0.3 mm.