Conveying system with adjustable bending head end

Abstract

The utility model discloses a conveying system with an adjustable bent head end, which is used for being matched with an intravascular stent to be released to a correct position, and comprises an inner tube and an outer tube, and the inner tube and the outer tube can operably rotate relatively and / or slide relatively axially; each of the inner pipe and the outer pipe comprises a head section and a tail section which are connected with each other, and a plurality of notches are formed in one side of each head section in the axial direction, so that the head sections are easily stressed to bend towards one sides of the notches. The head section of the system can be bent and adjusted according to the path of the blood vessel and the operation of the inner tube and the outer tube, so that the accuracy of the release position of the stent and the safety of a patient are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a head-end adjustable bending delivery system. Background Art

[0002] Currently, the release position of intravascular stents is adjusted by an adjustable bending sheath (achieved by pulling a traction wire buried in the wall of the adjustable bending sheath) or by controlling the shape of the guide wire. It is impossible to precisely control the release position of the stent, which may not only stimulate or damage the blood vessel wall, leading to inflammation or other complications and poor blood flow, increasing the risk of thrombosis, but also may cause accelerated intimal hyperplasia of the blood vessel, resulting in restenosis of the blood vessel and the risk of stent displacement. Summary of the Invention

[0003] Aiming at the above problems existing in the existing stent release position, the present invention aims to provide a head-end adjustable bending delivery system with high precision, high safety and convenient operation.

[0004] The specific technical solution is as follows:

[0005] A head-end adjustable bending delivery system for cooperating with the release of an intravascular stent to the correct position, comprising: an inner tube and an outer tube, the inner tube and the outer tube are operably relatively rotatable and / or relatively axially slidable;

[0006] Both the inner tube and the outer tube include a head section and a tail section connected to each other. A plurality of notches are axially provided on one side of the head section to facilitate the head section to be bent towards the side of the notch under force.

[0007] When the head section of the inner tube is coaxially arranged inside the head section of the outer tube, by relatively rotating the inner tube and the outer tube, the coincidence degree of a plurality of the notches on the inner tube and a plurality of the notches on the outer tube is adjusted, and further the directions in which the head of the inner tube and the head of the outer tube are easily bent under force are controlled;

[0008] When the inner tube and the outer tube relatively axially slide and the extended part of the head section of the inner tube slides out of the head section of the outer tube, the extended part of the head section of the inner tube is easily bent towards the side of the notch of the inner tube under force.

[0009] As a further improvement and optimization of this solution, the inner tube and the outer tube can be made of 304 stainless steel or nitinol.

[0010] As a further improvement and optimization of this solution, the notches are formed by laser cutting.

[0011] As a further improvement and optimization of this solution, the head sections of the inner tube and the outer tube can be heat-set into a predetermined shape.

[0012] As a further improvement and optimization of this solution, the notch includes an arc-shaped groove and is coaxially arranged with the inner tube and / or the outer tube.

[0013] As a further improvement and optimization of this solution, expansion grooves are respectively communicated with both ends of the arc-shaped groove.

[0014] As a further improvement and optimization of this solution, the length of the expansion groove is arranged along the axial direction of the inner tube and / or the outer tube.

[0015] The positive effects of the above technical solution compared with the prior art are as follows:

[0016] In the present utility model, when the system inserts into the blood vessel to determine the release and placement of the stent, during the insertion process of the system, the rotation of the inner tube is used to adjust the coincidence degree of several notches on the inner tube and several notches on the outer tube respectively, or by controlling the head section of the inner tube to extend outwards, to control the freedom degree of the head end of the system. The head end of the system can be bent and adjusted according to the path of the blood vessel and the operations of the inner tube and the outer tube, which greatly improves the accuracy of the stent release position and the safety of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the inner tube of a head-end adjustable bending delivery system of the present utility model in the extended state;

[0018] Figure 2 is a schematic structural diagram of the inner tube of a head-end adjustable bending delivery system of the present utility model without force;

[0019] Figure 3 is a schematic structural diagram of the inner tube of a head-end adjustable bending delivery system of the present utility model completely bent under force;

[0020] Figure 4 is a schematic structural diagram of the inner tube of a head-end adjustable bending delivery system of the present utility model in which several notches on the inner tube are respectively arranged opposite to several notches on the outer appearance;

[0021] Figure 5 is a schematic structural diagram of the inner tube of a head-end adjustable bending delivery system of the present utility model in which several notches on the inner tube are respectively arranged facing several notches on the outer appearance;

[0022] In the drawings: 1. Outer tube; 2. Inner tube; 21. Tail section; 22. Head section; 221. Notch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] In the description of the present utility model, it should be noted that when terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present utility model. In addition, when terms such as "first", "second", "third" appear, they are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, when terms such as "installation", "connection", "coupling" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0026] Figure 1 It is a schematic structural diagram of the inner tube in the extended state of a head-end adjustable-bending conveying system of the present utility model. Figure 2 It is a schematic structural diagram of the inner tube of a head-end adjustable-bending conveying system of the present utility model without force. Figure 3 It is a schematic structural diagram of the inner tube of a head-end adjustable-bending conveying system of the present utility model after being completely bent under force. Figure 4 It is a schematic structural diagram of the inner tube of a head-end adjustable-bending conveying system of the present utility model in which several notches of the inner tube are oppositely arranged with several notches of the appearance. Figure 5 It is a schematic structural diagram of the inner tube of a head-end adjustable-bending conveying system of the present utility model in which several notches of the inner tube are arranged facing several notches of the appearance, as Figures 1 - 5As shown in the figure, a head-end adjustable bending conveying system of a preferred embodiment is shown, which is used to cooperate with the intravascular stent to be released to the correct position, and includes: an inner tube 2 and an outer tube 1, and the inner tube 2 and the outer tube 1 can be operably rotated relative to each other and / or axially slid relative to each other; both the inner tube 2 and the outer tube 1 include a head section 22 and a tail section 21 connected to each other. On one side of the head section 22, a plurality of notches 221 are provided axially, so that it is easy for the head section 22 to be stressed and bend toward the side where the notches 221 are located; when the head section 22 of the inner tube 2 is coaxially arranged inside the head section 22 of the outer tube 1, by the relative rotation of the inner tube 2 and the outer tube 1, the coincidence degree of a plurality of notches 221 on the inner tube 2 and a plurality of notches 221 on the outer tube 1 is adjusted respectively, and then the directions in which the heads of the inner tube 2 and the outer tube 1 are easily bent under force are controlled; when the inner tube 2 and the outer tube 1 slide axially relative to each other and the head section 22 of the inner tube 2 slides out of the head section 22 of the outer tube 1, the extended part of the head section 22 of the inner tube 2 is easily bent toward the side where the notch 221 of the inner tube 2 is located. In this state, the degree of freedom of the overlapping part of the tail section 21 of the inner tube 2 and the head section 22 of the outer tube 1 is restricted.

[0027] In this embodiment, when the system is inserted into the blood vessel to determine the release and placement of the stent, during the insertion process of the system, the coincidence degree of a plurality of notches 221 on the inner tube 2 and a plurality of notches 221 on the outer tube 1 is adjusted by rotating the inner tube 2, or by controlling the head section 22 of the inner tube 2 to extend outward relative to the outer tube 1, so as to control the degree of freedom of the head end of the system. The head section 22 of the system can be bent and adjusted according to the path of the blood vessel and the operations of the inner tube 2 and the outer tube 1, greatly improving the accuracy of the stent release position and the safety of the patient.

[0028] Further, as a preferred embodiment, the inner tube 2 and the outer tube 1 can be made of 304 stainless steel or nitinol material.

[0029] Further, as a preferred embodiment, the notches 221 are formed by laser cutting.

[0030] Further, as a preferred embodiment, for the convenience of processing the inner tube 2 and the outer tube 1, the head sections 22 of the inner tube 2 and the outer tube 1 can be heat-set into a predetermined shape.

[0031] Further, as a preferred embodiment, the notches 221 include arc-shaped grooves and are coaxially arranged with the inner tube 2 and / or the outer tube 1.

[0032] Further, as a preferred embodiment, both ends of the arc-shaped groove are respectively communicated with an enlarged groove, which plays a role in removing stress at both ends of the arc-shaped groove. It not only facilitates the bending deformation effect of the head section 22 of the inner tube 2 / outer tube 1, but also avoids the phenomenon of cracks in the tube body.

[0033] Further, as a preferred embodiment, the enlarged grooves are arranged axially along the inner tube 2 and / or the outer tube 1.

[0034] In one embodiment, the tail section of the outer tube 1 has a handle (not shown in the figure) that is drivingly connected to the inner tube 2. One hand fixes the outer tube, and the other hand rotates or axially pushes and pulls the inner tube 2 through the handle.

[0035] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A delivery system with adjustable bend at the head end, used to release an intravascular stent to the correct position, characterized in that: It comprises: an inner tube and an outer tube, wherein the inner tube and the outer tube are operable to rotate relative to each other and / or slide relative to each other axially; The inner tube and the outer tube both include a head section and a tail section connected to each other, and a plurality of notches are axially arranged on one side of the head section to facilitate the head section to bend toward one side of the notches when subjected to force; When the head section of the inner tube is coaxially arranged in the head section of the outer tube, the inner tube and the outer tube are relatively rotated to adjust the overlap between the plurality of notches on the inner tube and the plurality of notches on the outer tube, thereby controlling the direction in which the head section of the inner tube and the head section of the outer tube are easily bent by force; When the inner tube and the outer tube slide axially relative to each other and the head section of the inner tube slides out of the head section of the outer tube, the extended portion of the head section of the inner tube is easily bent toward one side of the notch of the inner tube by force.

2. The head-end adjustable bend conveying system according to claim 1, characterized in that: The inner tube and the outer tube can be made of 304 stainless steel or nickel titanium material.

3. The head-end adjustable bend conveying system according to claim 1 is characterized in that: The notch is formed by laser cutting.

4. The head-end adjustable bend conveying system according to claim 1, characterized in that: The inner tube and the head section of the outer tube can be formed into a predetermined shape by heat setting.

5. The head-end adjustable bend conveying system according to claim 1, characterized in that: The notch comprises an arc-shaped groove and is coaxially arranged with the inner tube and / or the outer tube.

6. The head-end adjustable bend conveying system according to claim 5, characterized in that: Both ends of the arc-shaped groove are respectively connected with enlarged grooves.

7. The head-end adjustable bend conveying system according to claim 6, characterized in that: The length of the expansion groove is arranged along the axial direction of the inner tube and / or the outer tube.

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