CN218338574U

CN218338574U - Delivery device, delivery system and implant system for delivering implant

Info

Publication number: CN218338574U
Application number: CN202121252525.6U
Authority: CN
Inventors: 刘文博; 高小龙; 李微
Original assignee: Jiangsu Changyida Medical Technology Co ltd; Shanghai Suchang Medical Technology Co ltd
Current assignee: Jiangsu Changyida Medical Technology Co ltd; Shanghai Suchang Medical Technology Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2023-01-20
Anticipated expiration: 2031-06-04

Abstract

The utility model provides a conveyor, conveying system and implant system for carry the implant to the internal target position of patient, conveyor includes: a core filament configured as a filament of decreasing diameter from a proximal end to a distal end; at least one conveying element which is arranged on the core wire and protrudes out of the core wire and is used for displacing the implant through the friction force between the conveying element and the implant so as to realize the conveying of the implant to the target position; the conveying element limiting part is arranged between the core wire and the conveying element to limit the conveying element to move axially relative to the core wire; when the core wire moves to the target position, the core wire drives the conveying element to move synchronously through the conveying element limiting part, friction force is generated between the conveying element and the implant sleeved on the conveying element, so that the implant generates synchronous displacement, and when the implant moves to the target position, the core wire drives the conveying element to be separated from the implant through the conveying element limiting part.

Description

Delivery device, delivery system and implant system for delivering implant

Technical Field

The utility model relates to a medical technical field is intervene to nerve, specifically relates to a delivery device, conveying system and implant system that deliver the implant to the target location.

Background

Neuro-interventional medicine, interventional neuroradiology, also known as interventional neurosurgery, refers to a methodology for diagnosing and treating neurological disorders using interventional radiology methods. The treated object mainly comprises vascular diseases of parts of brain, meninges, face and neck, eyes, ears, nose and throat, spine, spinal cord and the like, including aneurysm, arteriovenous malformation, arteriovenous fistula, arterial stenosis, acute cerebral infarction, part of head and neck tumors and the like.

There is no fully unified understanding of the treatment of aneurysms, medical treatment is the basis, and the treatment of aneurysms mainly involves surgical clamping of the aneurysm and interventional intraluminal treatment. Surgery is a high risk, trauma and complication. Interventional treatment of aneurysms evolved from primary balloons, various forms of releasable coils, to various stents for wide-necked aneurysm assisted embolization to flow-directing devices (FD), such as dense mesh stents, covered stents, and the like. With the development of interventional technology, the popularization and the application of the bracket series products greatly improve the curative effect of interventional therapy on intracranial aneurysm. The current clinically major stenting techniques include stent assisted coil embolization, blood flow guide placement, and covered stent placement. The performance of the delivery device during the deployment of the stent has a considerable impact on the delivery difficulty and risk.

When intracranial aneurysm is treated by using an intravascular stent method, the stent is delivered into a blood vessel through a delivery guide wire. In the prior art, one transportation scheme is to mount a metal flange or a retaining ring on a core wire, and to fasten the metal flange or the retaining ring with an anchor point on a support, so as to transport the support. Because the metal flange or the ring buckle on the core wire is directly buckled with the anchor point on the bracket, the tail end of the bracket is easy to be damaged, and adverse effects can be generated in the process of inserting the bracket, such as the near end of the bracket can not be opened or the anchoring is poor, and the bracket can not be recovered and released by the mode. Furthermore, the presence of a metal flange or grommet can affect the compliance of the delivery system, potentially affecting delivery and stent release when traversing tortuous segments of intracranial vessels.

Another delivery scheme is to arrange a membrane structure on a mandrel of the delivery guide wire, load the stent on the membrane structure, and enable the stent to synchronously move along with the delivery guide wire under the action of friction force between the membrane structure and the stent. The two ends of the membrane structure are fixed on the mandrel through metal elements, or the membrane structure is directly stuck on the mandrel. In the scheme of bonding the membrane structure on the core wire, although the problem of flexibility of the core wire is improved, the intracranial blood vessels are thin and circuitous, so that the diameter of the delivery guide wire is small (the diameter of a part of the delivery guide wire, which is loaded with the stent, is generally between 0.07mm and 0.20 mm), and the connection strength between the membrane structure and the core wire is low due to the small contact area, poor strength of the membrane structure, poor shearing force resistance of glue and the like. Meanwhile, the blood and the contrast agent are soaked in the operation, so that the connection strength of the membrane structure can be further reduced, the membrane structure is loosened, folded or displaced, the condition of unloading the stent is caused, and the operation risk or operation failure is caused.

For solving the problems that the support existing in the use of the pushing device is easy to fall off, the support recovery difficulty is high and the risk is large, a novel support pushing device needs to be provided.

Disclosure of Invention

To the defects in the prior art, the utility model aims at providing a conveyor for carrying implant and including this conveyor's conveying system for carry the implant to the internal target location of patient, this transport seal wire can effectively reduce the emergence probability that the implant takes off the year, improves the security and the reliability of transporting the seal wire.

A delivery device for delivering an implant to a target location within a patient, comprising:

a core filament configured as a filament of decreasing diameter from a proximal end to a distal end;

at least one conveying element which is arranged on the core wire and protrudes out of the core wire and is used for displacing the implant through the friction force between the conveying element and the implant so as to realize the conveying of the implant to a target position;

and a conveying element limiting part arranged between the core wire and the conveying element to limit the axial movement of the conveying element relative to the core wire;

when the core wire moves to the target position, the core wire drives the conveying element to synchronously move through the conveying element limiting part, the friction force generated between the conveying element and the implant sleeved on the conveying element enables the implant to synchronously move, and when the implant moves to the target position, the core wire is acted on to drive the conveying element to be separated from the implant through the conveying element limiting part.

Optionally, the conveying element limiting part comprises a first limiting part arranged on the core wire and a second limiting part arranged on the conveying element, and the first limiting part and the second limiting part are embedded with each other to realize axial limiting.

Optionally, the first limiting portion is at least one groove or protrusion arranged on the outer surface of the core wire, the second limiting portion is an end portion of the conveying element or an accommodating groove arranged at the bottom of the conveying element, and the end portion of the conveying element is embedded into the groove or the protrusion of the core wire is embedded into the accommodating groove.

Optionally, the conveying element limiting part comprises at least one spring, the spring is fixed on the outer surface of the core wire, the conveying element is wrapped on the outer side of the spring, and the inner surface of the conveying element is penetrated in a spring spiral gap to form a tight fit with the spring.

Optionally, the conveying element comprises at least one conveying module, and the conveying module is a ring-shaped or tubular structure sleeved on the core wire.

Optionally, the core wire is provided with a plurality of said grooves circumferentially around its outer surface.

Optionally, the groove comprises an open inner wall of the groove, a notch is formed at the top of the inner wall of the groove, and the cross section of the inner wall of the groove comprises a rectangle, a trapezoid or an arc.

Optionally, the cross section of the inner wall of the groove is rectangular, and the size of the notch is the same as that of the inner wall of the groove.

Optionally, the cross section of the inner wall of the groove is trapezoidal or circular arc, and the size of the notch is larger than or smaller than that of the inner wall of the groove.

Optionally, the size of the notch is larger than the size of the inner wall of the groove, and the conveying element is adhered in the groove.

Optionally, a surface of the delivery element is a friction enhancing means to increase friction between the delivery element and the implant.

Optionally, the core wire is made of a biocompatible metal.

Optionally, the groove is formed by etching the outer surface of the core wire by laser for multiple times, so that at least one of the position, the depth and the shape of the groove reaches a desired value.

Optionally, the device further comprises a developing mark at the tail end of the core wire for indicating the position of the implant and the position of a delivery device.

Optionally, the developing mark is ring-shaped or spring, the material is selected from gold, platinum, ptW alloy or PtLr alloy, and the fixing mode comprises pressing, bonding or welding.

A delivery system for delivering an implant, comprising a delivery device, an introducer sheath having an axially extending lumen, and a catheter;

the conveying device further:

when the core wire moves to a target position, the core wire drives the conveying element to axially and synchronously move in the inner cavity through the conveying element limiting part, and the friction force generated between the conveying element and the implant sleeved on the conveying element enables the implant to synchronously move;

the implant is conveyed into the catheter through the guide sheath, and is released after being conveyed to a target position through the catheter, and the core wire is acted on to drive the conveying element to be separated from the implant through the conveying element limiting part.

Optionally, a fastening structure is arranged at the end part of the catheter for fixing the introducing sheath and the catheter and restraining the implant from entering the catheter, a cavity arranged on the catheter and an inner cavity of the introducing sheath form a conveying cavity which is axially communicated, and the implant is adapted to axially move in the conveying cavity through the conveying device.

An implant system comprises the delivery device, an introducing sheath, a catheter and an implant, wherein the catheter is a cavity consisting of a distal end part and a proximal end part, the distal end part of the catheter is guided to a target position in a patient body, the introducing sheath is connected with the proximal end part of the catheter, the cavity of the catheter and the inner cavity of the introducing sheath form a delivery cavity which is axially communicated, the implant moves to the distal end part of the catheter from the introducing sheath in the axial direction through the delivery cavity, and the implant is released after being delivered to the target position.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model provides a conveying element limiting part arranged between the core wire and the conveying element so as to limit the axial movement of the conveying element relative to the core wire; when the core wire moves to the target position, the core wire drives the conveying element to synchronously move through the conveying element limiting part, the friction force generated between the conveying element and the implant sleeved on the conveying element enables the implant to synchronously move, the risk that a conveying device of the implant falls off and slides in the operation is reduced, and in addition, when the implant moves to the target position, the core wire drives the conveying element to be separated from the implant through the conveying element limiting part. When the core wire is separated, the core wire is driven by the conveying element limiting part to withdraw only by overcoming the friction force and applying an external force to the core wire, and the core wire can be separated from the implant. The conveying element is limited by the conveying element limiting part to move axially relative to the core wire, so that the mode of overcoming the friction force is easier and the realization is more convenient.

2. The conveying element limiting part comprises a first limiting part arranged on the core wire and a second limiting part arranged on the conveying element, and the first limiting part and the second limiting part are embedded with each other to realize axial limiting. The axial limiting function of the conveying element relative to the axial movement of the core wire is enhanced through the embedding mode, the falling and sliding of the conveying device of the implant in the operation are reduced, and the implant is easy to separate from the conveying device when released.

3. The conveying element limiting part comprises at least one spring, the spring is fixed on the outer surface of the core wire, the conveying element is wrapped outside the spring, and the inner surface of the conveying element is infiltrated in the spiral gap of the spring to form close fit with the spring. Because the conveying element can be usually an elastic high polymer material, part of the high polymer material in the conveying element can permeate into the spiral gap of the spring to form tight fit with the spring, and the conveying element is high in installation strength and not easy to wrinkle and displace in the fixing mode, so that the conveying element does not need to be additionally bonded.

4. If the first limiting part is provided with at least one groove on the outer surface of the core wire, the connection condition of the conveying element and the core wire can be improved due to the existence of the groove, so that the connection strength is greatly improved, and the conditions of loosening and displacement of the conveying element are improved. Meanwhile, the thickness of the conveying element can be increased due to the increase of the gap, so that the conveying element is not prone to wrinkle, and the reliability of the conveying system is improved.

5. The utility model provides a core silk upper groove can use laser equipment processing, if use the many etching core silk surfaces of laser, make the recess reach expected value, at least one of them of the degree of depth of processing, shape, position reaches expected value, promotes the machining precision from this.

6. The utility model provides a carry component accessible lock or directly the shaping on the core silk, need not to bond, improved the compliance of carrying the seal wire, reduced the manufacturing degree of difficulty, improved component fixed strength.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic structural diagram including a conveying system according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a delivery device for delivering an implant according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a conveying element according to an embodiment of the present invention, in which the cross section of each groove is rectangular and the number of the grooves is 1;

fig. 4 is a schematic structural view of a conveying element provided by an embodiment of the present invention, in which the cross section of the grooves is rectangular and the number of the grooves is 2;

fig. 5 is a schematic structural view of a conveying element according to an embodiment of the present invention, in which the cross section of each groove is rectangular and the number of the grooves is 3;

fig. 6 is a schematic structural diagram of a conveying element according to an embodiment of the present invention, in which a groove cross section is trapezoidal;

fig. 7 is a schematic structural view illustrating a groove cross section of a conveying element according to an embodiment of the present invention is a circular arc shape;

FIG. 8 is a schematic view of an example of a position-limiting portion of the conveying element;

fig. 9 is a schematic structural view of a conveying element provided by an embodiment of the present invention, in which the cross section of the groove is trapezoidal and the notch is smaller than the bottom of the groove;

fig. 10 is a schematic structural view of a conveying element according to an embodiment of the present invention, in which the cross section of the groove is circular arc and the notch is smaller than the bottom of the groove;

fig. 11 is a schematic structural view illustrating an outer surface structure of a conveying element according to an embodiment of the present invention is corrugated;

fig. 12 is a schematic structural view illustrating an outer surface structure of a conveying element according to an embodiment of the present invention as a screw thread;

fig. 13 is a schematic structural diagram of a conveying element according to an embodiment of the present invention, in which the outer surface structure is a dot-shaped protrusion.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

In the following embodiments, the term "proximal" refers to the end closer to the operator, and "distal" refers to the end further from the operator. It is to be understood that the terms "distal" and "proximal" are to be understood as looking from the direction of an operator (e.g., an attending physician). The distal end is the side away from the operator, while the proximal end is towards the operator. In the present invention, if the phrase "axial direction" is used in this document, it should be understood to mean the direction in which the device of the invention is propelled, the direction perpendicular to the axial direction being defined as "radial".

The use of intravascular medical devices has become an effective method of treating many types of vascular disorders. Typically, a suitable intravascular device is inserted into the vasculature of a patient and navigated through the vasculature to a desired target location. Using this method, virtually any target site in the patient's vascular system can be accessed, including the coronary arteries, brain and peripheral vasculature. Medical implants, such as stents, stent grafts, shunts and vena cava filters, are commonly used in conjunction with delivery devices for placement at a desired location within the body. The implant may be, for example, a stent, a blood flow shunt, or other type of tubular implant. The stent is, for example, a self-expanding stent (i.e., a self-expanding stent), and may be, for example, a braided stent or a cut stent. In other embodiments, the tubular implant may be an embolic coil, a vascular occlusion device, or the like, and is not limited in this respect. In this embodiment, for convenience of description, the implant is described as a self-expandable stent, and for simplicity, the self-expandable stent is uniformly referred to as a "stent".

FIG. 1 illustrates an example schematic structural view of an implant delivery system including the present invention for delivering an implant, comprising: a delivery device 1, an introducing sheath 2 with an axial through inner cavity and a catheter (not shown in the figure).

The catheter may for example take the form of a microcatheter or the like. The implant delivery system may be configured before shipment. In use, wherein the catheter is introduced into the patient over a previously introduced guidewire (not shown), the catheter extends the entire length of the guidewire (not shown). In other alternative embodiments, the implant delivery system may be introduced into the patient after the guidewire is withdrawn, leaving the catheter distal portion at the target site for navigation of the implant delivery system within the catheter through the patient's vasculature. Catheters are configured for accessing a body lumen, such as a blood vessel, to perform a desired treatment at a target site. For example, the target site may be within a small diameter vessel having a lumen diameter of 2-5mm, and may be accessed by a tortuous vascular path, which may include a sheared vascular turn and multiple vascular branches. In this case, the catheter has a small suitable diameter and a flexible structure.

The catheter includes a proximal portion and a distal portion, and a lumen extending between the proximal portion and the distal portion. The distal portion of the catheter, in use, is introduced to a target site in a patient, such as an occlusion in a blood vessel, an occlusion in a blood vessel adjacent to the neck of an aneurysm, a bifurcated blood vessel, and the like. The lumen of the catheter is sized to accommodate axial movement of the radially collapsed implant and delivery device. The catheter may include one or more regions of different configuration and/or properties along its length. For example, the proximal and distal portions may be formed of different materials such that the distal portion has sufficient pushability to advance through the vascular system of the patient, while the proximal portion may be formed of a more flexible material such that the proximal portion may remain flexible and more easily push on the device for axial movement.

The sheath body of the introducer sheath 2 may have a smaller outer diameter at the distal end than at the proximal end to reduce the profile of the distal end and facilitate navigation through tortuous vasculature. Further, the distal portion may be more flexible than the proximal portion. Typically, the proximal portion may also be formed of a harder material than the distal portion. However, the above description is only illustrative and not restrictive.

The catheter is a cavity consisting of a distal end part and a proximal end part, the distal end part of the catheter is guided to a target position in a patient body, the introducing sheath 2 is connected with the proximal end part of the catheter, the cavity of the catheter and the inner cavity of the introducing sheath 2 form a conveying cavity which is axially communicated, the implant moves to the distal end part of the catheter from the introducing sheath shaft 2 through the conveying device 1 in the conveying cavity, and the implant 3 is released after being conveyed to the target position.

The proximal end part of the catheter is provided with a combination structure for fixing the guiding sheath 2 and the catheter and restraining the implant 3 from entering the catheter, a cavity arranged on the catheter and an inner cavity of the guiding sheath form a conveying cavity which is axially communicated, and the implant 3 is adapted to axially move in the conveying cavity through a conveying device and is released after reaching a target position. The coupling structure may be a snap fit or the like, which can fit the distal end of the introducer sheath 2 over the proximal end of the catheter to complete the fixation. And the snap fit also causes the delivery device to be constrained to its catheter, in the case of a stent, which is constrained in shape to move axially from the lumen of the introducer sheath 2 into the catheter.

The lumen of the introducer sheath 2 serves as a delivery channel for the delivery device 1 to deliver the implant 3 to the target site, and also as a withdrawal channel for the delivery device 1 after the implant 3 is positioned at the target site, with the delivery device 1 separated from the implant 3. A development marker 14 is also provided on the distal end portion of the transport apparatus 1. Visualization markers 14 may be located on the distal portion of the delivery device 1 to indicate the position of the stent and delivery device 1, and the positioning of the implant, delivery device, when implanted. The material can be gold, platinum, ptW alloy or Ptlr alloy. The developing mark 14 may be annular or elastic, and may be fixed by pressing, bonding, or welding. Taking the imaging marker 14 as an elastic body for example, when the imaging marker 14 abuts against the distal end part of the catheter lumen during delivery, the implant 3 is pressed against the inner wall of the catheter lumen, so that the implant 3 is released, and the delivery device is withdrawn after the delivery device 1 is quickly separated from the implant 3.

The above-described input transport system is merely exemplary and is not intended to limit the present invention. The delivery catheter of introducer sheath 2 and catheter may also be of other configurations, as long as axial translation of the delivery catheter and delivery device relative to each other is accomplished (e.g., by pulling the delivery catheter in a proximal direction, by pushing an elongated delivery device in a distal direction, or both) to advance an implant (e.g., a stent) distally within the lumen of the delivery catheter until the implant protrudes from the lumen of the delivery catheter at the target location of the blood vessel, where it is released.

The following is a more detailed description of the delivery device for implants of the present invention. Please refer to fig. 2, which is a diagram illustrating a structure of a delivery device for delivering an implant according to the present invention. The delivery device is used for delivering the implant to a target position in a patient body, and can effectively reduce the probability of the occurrence of implant unloading and improve the safety and reliability of the delivery guide wire. The delivery device 100 may include a core wire 110, an elastomer 120, at least one delivery element 130, and a development indicia 140.

The core wire 110 is provided as a filament having a diameter gradually decreasing from a proximal end to a distal end. The core wire 110 may be made of a biocompatible material such as nitinol, stainless steel, or a composite material of nitinol and stainless steel, and the length and diameter thereof may be adjusted and optimized according to the type and specification of the delivery stent, so that the delivery stent can smoothly reach the lesion site and has a better manipulation performance. In some cases, the core wire 110 may be made of the same material along its length, or in some embodiments, may include portions or sections made of different materials. In some embodiments, the materials used to construct the core wire 110 are selected to impart different flexibility and stiffness characteristics to different portions of the core wire 110. For example, the proximal and distal portions of the core wire 110 may be formed of different materials, such as materials having different elastic moduli, resulting in a difference in flexibility. Any suitable material or combination of materials may be used for core wire 110, as desired. The core wire 110 tapers from a relatively large diameter proximal portion to a relatively small diameter distal portion.

And the delivery element 130 is arranged on the core wire 110 and protrudes out of the core wire 110, and is used for displacing the implant through the friction force between the implant and the delivery element so as to realize the delivery of the implant. In this example, the delivery member 130 is further explained as being configured and protruding above the core wire 110. The delivery member 130 is disposed on the core wire 110 in a manner that is not limited as long as it ensures that the delivery member 130 defines an axial movement on the core wire 110.

Taking the stent as an example, the purpose of better supporting the stent and conveying the stent to the target position is achieved. The conveying element 130 comprises at least one conveying module, which is a ring-shaped or tubular structure sleeved on the core wire 110. The delivery element 130 may be a plurality of annular or tubular projections that fit over the core wire 110. A plurality of conveying modules can be arranged on the core wire 110 at intervals from the proximal end to the distal end along the axial position of the core wire, or the conveying modules are densely arranged at the distal end and arranged at the proximal end at sparse intervals, so that the core wire is convenient to be separated from the stent subsequently. A plurality of delivery modules may be disposed about the periphery of the core wire 110. The plurality of delivery modules are uniformly arranged on the outer peripheral surface of the core wire 110, and the arrangement has the effect of supporting the stent well. The conveying element 130 may be made of a polymer material having a certain hardness and a certain elasticity, such as silicone, thermoplastic Polyurethane (TPU), nylon (Nylon), and may be manufactured by injection molding, extrusion, leaching, and the like. The specification (length and diameter) of the conveying element 130 is matched with the conveyed target stent, the number (1, 2 or more) of the conveying elements can be adjusted to be matched with the target stent, the conveying element 130 is tightly extruded with the stent after being bonded and fixed, and the stent is displaced by friction force, so that stent conveying is realized. Delivery member 130 is configured to displace the implant via frictional forces with the implant to effect delivery of the implant to the target site.

And the elastic body 120 is arranged on the core wire 110 and is positioned on one side of the conveying element 130, which is biased to the proximal end, and is used for reducing the rigidity of the conveying device 100 in the process of conveying the implant and improving the maneuverability of the conveying device 100. The elastic body 120 can be made of stainless steel or other biocompatible materials without shape memory, and fixed by welding, bonding, etc., and the parameters such as length, outer diameter, etc. can be adjusted and optimized according to the type and specification of the delivery stent. The exterior of the elastomer 120 may be coated with Polytetrafluoroethylene (PTFE) or other low coefficient of friction polymeric material to improve the smoothness of the delivery device 100. The elastic body 120 may be a spring, or may be a coil or the like to achieve the effect of rigidity of the small delivery device 100 during the delivery of the implant.

The developing mark 140 is located at the end of the core wire 110 for indicating the position of the stent and the delivery device, and for positioning the stent and the delivery device during implantation, the material thereof can be gold, platinum, ptW alloy or Ptlr alloy, etc. The developing marks 140 may be ring-shaped or spring-shaped, and may be fixed by pressing, adhering, or welding, and the number and position of the developing marks 140 may be adjusted according to the adaptive bracket.

At least one conveying element limiting part is further arranged on the core wire 110 to limit the conveying element 130 to move axially relative to the core wire 110.

When the core wire 110 moves to the target position, the core wire 110 drives the conveying element 130 to move synchronously through the conveying element limiting part, friction force generated between the conveying element 130 and the implant sleeved on the conveying element 130 enables the implant to generate synchronous displacement, and when the implant moves to the target position, the core wire 110 is acted on to drive the conveying element 130 to separate from the implant (such as a stent) through the conveying element limiting part. The core wire 110 limits the axial movement of the delivery element 130 relative to the core wire 110 by the delivery element limiting portion, and the friction force generated between the delivery element 130 and the implant only needs to be overcome when the core wire 110 is removed. Due to the effect of the delivery element limiting portion, the core wire 110 and the delivery element 130 are fixed and do not move axially, and the implant can be separated from the delivery element 130 only by overcoming the friction force, which can be performed in various ways, for example, by setting a certain anchor point structure to fix the implant at the target position.

The conveying element limiting part may include a first limiting part disposed on the core wire 110 and a second limiting part disposed on the conveying element 130, and the first limiting part and the second limiting part are embedded with each other to realize axial limiting. The first limiting part is at least one groove or protrusion arranged on the outer surface of the core wire 110, the second limiting part is an accommodating groove arranged at the end part of the conveying element 130 or the bottom of the conveying element, and the end part of the conveying element is embedded into the groove or the protrusion of the core wire is embedded into the accommodating groove.

The structure easy to realize is that the first limit part is a groove arranged on the outer ring surface of the core wire, the inner ring surface of the conveying element forms the second limit part, and the inner ring of the conveying element is embedded into the groove. The axial limiting effect is optimal, the fixing strength is greatly improved, and the risk that the conveying device of the implant falls off and slides in the operation is further reduced. The cross section of the groove can be rectangular, trapezoidal, triangular and the like. The conveying element 130 is partially embedded into the groove after installation, two side walls of the groove play a role in fixing the conveying element 130, stress of connecting materials between the core wire 110 and the conveying element 130 is reduced, the conveying element 130 is not easy to fall off, and pushing and recycling performance of the conveying device is improved.

The grooves on the surface of the core wire 110 may be formed by grinding, electrochemical etching, laser machining, or the like. The grooves on the core wire 110 are difficult to machine due to small size, high precision requirement, and fragile machining position, and the core wire is easily damaged when machining is performed by means of grinding and the like. In a preferred processing manner, the groove on the core wire 110 may be processed by laser etching the outer surface of the core wire multiple times, so as to process at least one of the position, the depth and the shape of the groove to a desired value. Generally, the core wire 110 is slender, and the position, depth and shape of the groove processed on the core wire can be firstly set by software, and then the laser is controlled by the software to be etched for multiple times, so that the processing requirement is met, and the groove can reach the expected depth and shape.

As shown in fig. 3-5, the cross-section of the groove on the surface of the core wire 110 may be rectangular, and the number of the grooves may be 1 (shown in fig. 3), 2 (shown in fig. 4) or more (3 grooves shown in fig. 5), and the conveying element 130 is partially fixed in the groove, and in order to make the conveying element 130 more firmly fixed in the groove, the conveying element 130 may be optionally further fixed in the groove by means of, for example, glue bonding.

As shown in fig. 6-7, the cross-section of the grooves on the surface of the core wire 110 may also be circular or trapezoidal, and the number of the grooves may also be 1, 2 or more.

Because the processed groove can play a role in positioning, the core wire 110 with the groove shown in fig. 6-7 can improve the accuracy of the mounting position of the conveying element 130 on the conveying device, and reduce errors in the assembly process, and meanwhile, because the diameter of the core wire 110 at the groove is reduced, the gap between the core wire 110 and the conveying element 130 can be properly increased, the bonding difficulty of the core wire 110 and the conveying element 130 is favorably reduced, and the yield in the production process is improved.

Referring to fig. 8, a spring 150 is mounted on the surface of the core wire 110, and the spring 150 may be fixed by welding, bonding, or the like. After the spring 150 is fixed, the conveying element 130 can be wrapped outside the spring 150 through leaching, thermal shrinkage and other modes, because the conveying element 130 is usually an elastic high polymer material, part of the material can permeate into the spiral gap of the spring 150 and form tight fit with the spring, under the fixing mode, the mounting strength of the conveying element 130 is high, and wrinkles and displacement are not easy to occur, so that the conveying element 130 does not need to be additionally bonded, meanwhile, because the spring 150 supports the conveying element 130, the fit between the conveying element 130 and the support 300 is firmer, the support is not easy to unload, and the reliability of the system in the using process is improved.

As shown in fig. 9-10, the notch of the groove on the surface of the core wire 110 is smaller than the groove bottom, and the conveying element 130 is mounted to the groove position and can be directly buckled with the core wire 110.

The conveying element 130 shown in fig. 9-10 is directly manufactured and molded on the core wire 110, and due to the existence of the groove, the conveying element 130 can be directly and tightly combined with the core wire 110 in a mode of injection molding, leaching and the like, so that the fixing strength is high, the conveying element 130 is not easy to deform and fall off, and the safety in operation is improved.

Certain treatments may also be applied to the surface of the transport element 130. I.e., a friction enhancing means for the surface of the delivery member to increase the friction between the delivery member and the implant. As shown in fig. 11-13, a special structure such as a corrugation (as shown in fig. 11), a thread (as shown in fig. 11) or a spot-like protrusion (as shown in fig. 13) can be formed on the surface of the delivery element 130 by knurling, etching, cutting, leaching, etc. to increase the friction between the delivery element 130 and the implant, so that the implant is not easy to fall off and slip, thereby improving the reliability and the maneuverability of the delivery system.

The utility model provides a conveying element installs at core silk groove position, and conveying element fixed strength improves by a wide margin, and then has reduced the risk that the conveyor of implant drops, slides in the art.

An implant system comprises the delivery device, an introducing sheath, a catheter and an implant, wherein the catheter is a cavity body consisting of a distal end part and a proximal end part, the distal end part of the catheter is guided to a target position in a patient body, the introducing sheath is connected with the proximal end part of the catheter, the cavity body of the catheter and the inner cavity of the introducing sheath form a delivery cavity body which is axially communicated, the implant is axially moved to the distal end part of the catheter from the introducing sheath through the delivery device, and the implant is released after being delivered to the target position.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. A delivery device for delivering an implant to a target location within a patient, comprising:

core wire;

at least one conveying element which is arranged on the core wire and protrudes out of the core wire and is used for displacing the implant through the friction force between the conveying element and the implant so as to realize the conveying of the implant to the target position;

2. The delivery device of claim 1, wherein the delivery element retainer comprises a first retainer disposed on the core wire and a second retainer disposed on the delivery element, and the first retainer and the second retainer are embedded in each other to achieve axial retention.

3. The delivery device according to claim 2, wherein the first position-limiting portion is at least one of a groove or a protrusion formed on an outer surface of the core wire, the second position-limiting portion is a receiving groove formed at an end portion of the delivery member or a bottom portion of the delivery member, and an end portion of the delivery member is inserted into the groove or a protrusion of the core wire is inserted into the receiving groove.

4. The delivery device of claim 1, wherein the delivery element retainer comprises at least one spring secured to an outer surface of the core wire, the delivery element being wrapped around an outer side of the spring, an inner surface of the delivery element being penetrated within a spring coil gap to form a tight fit with the spring.

5. The delivery device of claim 1, wherein the delivery element comprises at least one delivery module, the delivery module being a ring or tube structure that fits over the core wire.

6. A delivery device for delivering an implant according to claim 3, wherein the corewire is provided with a plurality of said grooves circumferentially about its outer surface.

7. The delivery device of claim 3, wherein the recess comprises an open recess inner wall, the top of the recess inner wall forming a notch, the cross-section of the recess inner wall comprising a rectangle, trapezoid or arc.

8. The delivery means for delivering an implant according to claim 7, wherein the cross-section of the inner wall of the recess is rectangular and the size of the notch is the same as the size of the inner wall of the recess.

9. The delivery device of claim 7, wherein the cross-section of the inner wall of the recess is trapezoidal or circular, and the size of the notch is larger or smaller than that of the inner wall of the recess.

10. The delivery device of claim 7, wherein the slot has a dimension greater than the dimension of the inner wall of the recess, and the delivery element is adhered within the recess.

11. A delivery device for delivering an implant according to claim 1, wherein the surface of the delivery member is a friction enhancing device for increasing the friction between the delivery member and the implant.

12. The delivery device for delivering an implant of claim 1, wherein the core wire is made of a biocompatible metal.

13. The delivery device of claim 3, wherein the groove is formed by laser etching the outer surface of the core wire multiple times to process at least one of the position, depth and shape of the groove to a desired value.

14. The delivery device of claim 1, further comprising a visualization marker located at the end of the core wire for indicating the location of the implant and the location of the delivery device.

15. A delivery device for delivering an implant according to claim 14, wherein the visualization marker is a ring or a spring, the material is selected from gold, platinum, ptW alloy or PtLr alloy, and the fixation means comprises crimping, bonding or welding.

16. A delivery system for delivering an implant, comprising a delivery device, an introducer sheath having an axially extending lumen therethrough, and a catheter;

the conveying device further:

core yarn;

17. A delivery system for delivering an implant according to claim 16, wherein the proximal end of the catheter is provided with engagement structure for securing the introducer sheath to the catheter and restraining the implant from entering the catheter, the catheter being provided with a lumen forming an axially extending delivery lumen with an inner lumen of the introducer sheath, the implant being adapted for release by the delivery device by axial movement within the delivery lumen to the target site.

18. An implant system comprising the delivery device of any one of claims 1 to 15, an introducer sheath, a catheter and an implant, wherein the catheter is a lumen comprising a distal portion and a proximal portion, the distal portion of the catheter is guided to a target site in a patient, the introducer sheath is connected to the proximal portion of the catheter, the lumen of the catheter and an inner lumen of the introducer sheath form a delivery lumen extending axially therethrough, the implant is moved axially from the introducer sheath to the distal portion of the catheter via the delivery device within the delivery lumen, and the implant is released after delivery to the target site.