Implant pushing system

Abstract

The utility model provides an implant pushing system which comprises an implant and a pushing rod used for pushing the implant. The pushing rod is a hollow pipe, and the pushing rod is provided with a far-end pipe body located at the far end; a plurality of through groove groups are formed in the far-end tube body at intervals in the axial direction of the push rod; a dislocation angle is formed between every two adjacent through groove sets in the preset circumferential direction of the far-end tube body in the direction from the near end of the far-end tube body to the far end of the far-end tube body, and the dislocation angle ranges from 5 degrees to 85 degrees; according to the implant pushing system, the pushing delay phenomenon can be avoided, and the pushing stability of the implant pushing system is improved; in addition, the torsion performance of the far end of the pushing rod can be improved, the conveying in-place performance of the pushing rod can be improved, meanwhile, the situation that the far end of the pushing rod is broken when being subjected to large torsion force can be avoided, and the overall pushing stability of the implant pushing system is improved.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to an implant pushing system. Background Art

[0002] In the field of interventional therapy, whether it is an interventional device or an implant, the interventional device / implant must be pushed to the target blood vessel through a push system. Existing push systems are basically composed of a long guide wire-like push rod. During the push process, it may need to pass through curved blood vessels, which places high demands on the delivery performance of the push rod, such as pushing force and passability.

[0003] The existing methods for improving the delivery performance of the push rod include the following two methods: the first method is as follows: Figure 1 As shown in the figure, the push rod is set to be variable diameter or variable diameter plus outer surface coating, that is, the outer diameter of the push rod gradually decreases from the proximal end to the distal end. Although this can improve the softness of the distal end of the push rod, the overall strength of the push rod is still high, and the distal end kicking phenomenon is very likely to occur. The pushing force is also large, which is very inconvenient to use in surgery; the second type, such as Figure 2 As shown, the push rod is arranged in sections. For example, the push rod is arranged as a proximal metal tube and a distal spring tube, and the outer surface of the spring tube is covered with a heat shrink tube, that is, the spring tube is connected to the distal end of the metal tube. In this way, although the distal end of the push rod is softer, it is prone to distal action delay, that is, the proximal end has been pushed a certain distance, but the distal end does not respond enough, which will cause unstable use of the instrument and increase the risk of surgery. Utility Model Content

[0004] The utility model aims to provide an implant pushing system.

[0005] In order to solve the above-mentioned problems, the utility model provides an implant pushing system, including an implant and a pushing rod for pushing the implant; the pushing rod is a hollow tube, and the pushing rod has a distal tube body located at the distal end; along the axial direction of the pushing rod, a plurality of through groove groups are arranged at intervals on the distal tube body; from the proximal end of the distal tube body toward the distal end, around the preset circumference of the distal tube body, there is a staggered angle between two adjacent through groove groups, and the staggered angle is 5° to 85°.

[0006] As an optional technical solution, the misalignment angles corresponding to the plurality of through groove groups are consistent.

[0007] As an optional technical solution, the distal tube body includes a first section and a second section connected to the distal end of the first section; the misalignment angle corresponding to the through groove group on the first section is a first misalignment angle, and the misalignment angle corresponding to the through groove group on the second section is a second misalignment angle, and the first misalignment angle is smaller than the second misalignment angle.

[0008] As an optional technical solution, the absolute value of the difference between the first misalignment angle and the second misalignment angle is less than 5°.

[0009] As an optional technical solution, the through groove group includes two through grooves extending along the circumference of the distal tube body and arranged at intervals, and the two through grooves are symmetrically arranged about the center of the circle where the through grooves are located.

[0010] As an optional technical solution, the implant pushing system further includes a heat shrink tube sleeved on the outer periphery of the distal tube body.

[0011] As an optional technical solution, the push rod is one of a stainless steel tube, a nickel-titanium tube, and a cobalt-chromium-nickel alloy tube.

[0012] As an optional technical solution, the implant is an embolic spring coil connected to the distal end of the pushing rod; the implant pushing system also includes a release component for disengaging the embolic spring coil from the pushing rod.

[0013] As an optional technical solution, the release assembly includes:

[0014] A heating tube located between the push rod and the embolization spring coil, wherein the heating tube is a hollow tube, and the distal end of the heating tube is connected to the proximal end of the embolization spring coil;

[0015] A connecting wire, the connecting wire is passed through the heating tube, one end of the connecting wire is connected to the embolization spring coil, and the other end is connected to the pushing rod, and the heating tube is used to fuse the connecting wire;

[0016] A power supply component, the power supply component includes a first wire that passes through the push rod and is connected to the heating tube, and a second wire that is connected to the heating tube, one of the first wire and the second wire is used to connect to the positive pole of the external power supply, and the other is used to connect to the negative pole of the external power supply.

[0017] As an optional technical solution, the implant is an implant bracket engaged with the distal end of the distal tube body.

[0018] Compared with the prior art, the implant pushing system in the utility model has grooves on the distal tube body of the pushing rod, and at the same time, the misalignment angle between two adjacent through-groove groups is set to 5°~85°, which can improve the softness of the distal end of the pushing rod, reduce the resistance of the pushing rod during the pushing process, thereby reducing the pushing force, and can avoid the kicking tube phenomenon at the distal end of the pushing rod, which is convenient for use during surgery; at the same time, it can avoid the phenomenon of pushing delay, that is, the movements of the distal and proximal ends of the pushing rod are consistent, thereby improving the pushing stability of the implant pushing system; in addition, it can improve the torsional performance of the distal end of the pushing rod, improve the delivery of the pushing rod into place, and at the same time, it can avoid the breakage of the distal end of the pushing rod when subjected to a large torsional force, thereby improving the overall pushing stability of the implant pushing system and reducing surgical risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the first push rod in the prior art of the utility model;

[0020] Figure 2 A sectional view of a longitudinal section of a second push rod in the prior art of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the implant pushing system in the first embodiment of the utility model (without the heat shrink tube);

[0022] Figure 4 for Figure 3 A schematic diagram of a part of the structure of the push rod;

[0023] Figure 5 for Figure 4 The AA section view;

[0024] Figure 6 for Figure 4 The cross-sectional view along the BB direction;

[0025] Figure 7 It is a structural schematic diagram of an implant pushing system in a second embodiment of the utility model;

[0026] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at point C in the middle. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the following is a detailed description of the invention in combination with the specific implementation methods and the attached drawings. Figures 3 to 8 It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] The words expressing position and direction described in the present invention are all based on the operator of the instrument during the operation as a reference, the end close to the operator of the instrument is the proximal end, and the end away from the operator of the instrument is the distal end. At the same time, the terms first, second, etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated; in addition, it should be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, the connection can be a direct connection or an indirect connection through an intermediate medium, and can be a fixed connection, a movable connection, a detachable connection, or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Please refer to Figures 3 to 6 As shown, an implant pushing system 10 in the first embodiment of the utility model is shown, and the implant pushing system 10 includes an implant 1 and a pushing rod 2 for pushing the implant 1. When the implant pushing system 10 is in a pushing state, the implant 1 is connected to the distal end of the pushing rod 2, so that when the pushing rod 2 moves toward the target blood vessel position, the implant 1 is pushed to move toward the target blood vessel position.

[0030] The push rod 2 is a hollow tube, and has a distal tube body 21 located at the distal end and a proximal tube body 22 located at the proximal end of the distal tube body 21. The distal tube body 21 and the proximal tube body 22 are an integrated structure, that is, the distal tube body 21 and the proximal tube body 22 can be understood as different sections of a tube body.

[0031] Specifically, the length of the distal tube body 21 is 300 mm to 500 mm, but is not limited thereto.

[0032] Specifically, the push rod 2 can be made of a hollow stainless steel tube, a nickel-titanium tube, or a cobalt-chromium-nickel alloy tube. Of course, the invention is not limited thereto.

[0033] Furthermore, along the axial direction of the push rod 2, a plurality of through groove groups 211 are provided at intervals on the distal tube body 21. On the one hand, the softness of the distal end of the push rod 2 can be improved, the resistance during the pushing process of the push rod 2 can be reduced, thereby reducing the pushing force, and at the same time, the kicking phenomenon of the distal end of the push rod 2 can be avoided, which is convenient for use during surgery; on the other hand, after the distal tube body 21 is grooved, the distal tube body 21 still retains part of the axial performance of the distal tube body 21 before the grooves are opened, which can avoid the phenomenon of pushing delay, that is, the movement of the distal end and the proximal end of the push rod 2 is consistent, and the pushing stability of the implant pushing system 10 is improved, thereby reducing the risk of surgery.

[0034] Specifically, the distal tube body 21 can be cut by laser or hard tool to form the through groove group 211. Of course, this is not limited to this.

[0035] Furthermore, combined with Figures 4 to 6 As shown, from the proximal end toward the distal end of the distal tube body 21, there is a misalignment angle α between two adjacent through groove groups 211 around the preset circumference of the distal tube body 21, and the misalignment angle α is 5° to 85°. The torsional performance of the distal end of the push rod 2 can be improved, and the delivery performance of the push rod 2 can be improved. At the same time, the distal end of the push rod 2 can be prevented from being broken when subjected to a large torsional force, thereby improving the overall push stability of the implant push system 10 and reducing surgical risks.

[0036] It should be noted that the above-mentioned misalignment angle α refers to the misalignment angle α of two adjacent through-slot groups 211 in the same preset circumferential direction from the proximal end to the distal end of the distal tube 21. The misalignment angle α between each two adjacent through-slot groups 211 can be set according to specific needs.

[0037] In this embodiment, the distal tube body 21 includes a first section and a second section connected to the distal end of the first section; the misalignment angle α corresponding to the through-slot group 211 on the first section is the first misalignment angle, that is, the misalignment angle α between the through-slot groups 211 on the first section is consistent, which is the first misalignment angle. The misalignment angle α corresponding to the through-slot group 211 on the second section is the second misalignment angle, that is, the misalignment angle α between the through-slot groups 211 on the second section is consistent, which is the second misalignment angle. The first misalignment angle is smaller than the second misalignment angle, that is, in this embodiment, the misalignment angle α between adjacent through-slot groups 211 on the second section corresponding to the distal end of the distal tube body 21 is greater than the misalignment angle α between adjacent through-slot groups 211 on the first section corresponding to the proximal end of the distal tube body 21, which can further improve the softness of the distal end of the distal tube body 21, that is, further improve the softness of the distal end of the push rod 2. Of course, this is not limited to this. In other embodiments, the misalignment angles α between all the through groove groups 211 in the distal tube body 21 can also be set to be consistent, that is, the misalignment angles α corresponding to the several through groove groups 211 in the entire distal tube body 21 are consistent, which can facilitate the molding of the push rod 2, or the misalignment angle α can be set to gradually increase from the proximal end to the distal end to further improve the softness of the distal end of the distal tube body 21.

[0038] In a specific implementation, the absolute value of the difference between the first misalignment angle and the second misalignment angle is less than 5°, that is, the second misalignment angle is no greater than the first misalignment angle by no more than 5°. Of course, this is not limited to this.

[0039] Specifically, each through groove group 211 includes at least one through groove extending along the axial direction of the distal tube body 21. It can be known that when each through groove group 211 includes two or more through grooves, the two or more through grooves in a through groove group 211 are arranged at intervals, that is, there is an arc-shaped connecting rib 212 between two adjacent through grooves in the circumferential direction of the distal tube body 21.

[0040] In a specific embodiment, the through groove group 211 includes two through grooves extending along the circumference of the distal tube body 21 and arranged at intervals, and the two through grooves are symmetrically arranged about the center of the circle where the through grooves are located.

[0041] Furthermore, the implant pushing system 10 also includes a heat shrink tube sleeved on the outer periphery of the distal tube body 21, which can cover the through groove, thereby reducing the pushing resistance of the pushing rod 2. At the same time, it can also prevent the pushing rod 2 from scraping the inner cavity of the microcatheter used to guide the implant pushing system 10 during the delivery process.

[0042] Specifically, the heat shrink tube is made of materials such as Pebax, PET, POE, etc. Of course, it is not limited to this.

[0043] Combination Figure 3 As shown, in this embodiment, the implant 1 is an embolic spring coil.

[0044] Furthermore, the implant delivery system 10 also includes a release assembly for releasing the embolic coil from the delivery rod 2. After the implant delivery system 1 delivers the embolic coil to the target blood vessel location requiring embolization, the release assembly releases the embolic coil, thereby performing embolization therapy.

[0045] In a specific embodiment, the release assembly includes a heating tube 4 located between the push rod 2 and the embolic spring coil, a connecting wire (not numbered) connecting the embolic spring coil to the push rod 2, and a power supply assembly (not numbered) for supplying heat to the heating tube 4. The heating tube 4 is a hollow tube, and the distal end of the heating tube 4 is connected to the proximal end of the embolic spring coil by welding. The connecting wire is inserted into the heating tube 4, and one end of the connecting wire is connected to the embolic spring coil and the other end is connected to the push rod 2, so that the proximal end of the heating tube 4 is against the distal end of the push rod 2, so that the push rod 2 can push the embolic spring coil. The power supply assembly includes a first wire (not numbered) inserted into the push rod 2 and connected to the heating tube 4, and a second wire (not numbered) connected to the heating tube 4, one of the first wire and the second wire is used to connect the positive pole of the external power supply, and the other is used to connect the negative pole of the external power supply. After the power supply assembly is connected to the external power supply, the heating tube 4 heats up and fuses the connecting wire, thereby separating the embolic spring coil from the push rod 2. Of course, this is not limiting, and other release components that can separate the embolic spring coil from the push rod 2 are also within the protection scope of the present utility model, such as existing electrolyzable metal rings.

[0046] It can be known that the first wire and the second wire both pass through the proximal end of the push rod 2 to be connected to an external power source.

[0047] The surgical operation process of the implant pushing system 10 in this embodiment is as follows:

[0048] Choose radial artery or femoral artery access, perform vascular puncture using Seldinger puncture method, and deliver the guide wire to the target vessel;

[0049] Insert the microcatheter along the guide wire and push it to the blood vessel, aneurysm / pseudoaneurysm to be embolized;

[0050] The implant pushing system 10 is delivered into the microcatheter, pushed to the aneurysm, and then the embolic spring coil is released by the release component. After the release is completed, the embolic spring coil remains at the aneurysm to play an embolic role and prevent blood from flowing into the aneurysm. During the whole delivery process, the implant pushing system 10 is very stable, and the operation is very simple and convenient.

[0051] Combination Figure 7-Figure 8 The implant pushing system 10a in the second embodiment of the present invention is shown. The difference between the implant pushing system 10a in the second embodiment of the present invention and the implant pushing system 10 in the first embodiment is that the implant 1a is an implant bracket engaged with the distal end of the distal tube body 21, and the implant bracket can automatically detach from the pushing rod 2 under its own expansion, so there is no need to release the assembly.

[0052] In a specific embodiment, the distal end of the distal tube body 21 has a slot 213, and the proximal end of the implanted stent has a block 11 engaged in the slot, thereby connecting the implanted stent to the distal end of the push rod 2. Of course, this is not limited to this.

[0053] Specifically, the implant bracket can use the existing implant bracket, and the clamping block 11 can be set as a developing block, which will not be described in detail here.

[0054] The implant pushing system 10a in the second embodiment of the present invention is the same as the implant pushing system 10 in the first embodiment except for the above-mentioned differences, which will not be described in detail herein.

[0055] In summary, the implant pushing system 10, 10a in the utility model is grooved on the distal tube body 21 of the pushing rod 2, and at the same time, the misalignment angle α between the two adjacent through-groove groups 211 is set to 5°~85°, which can improve the softness of the distal end of the pushing rod 2, reduce the resistance of the pushing rod 2 during the pushing process, thereby reducing the pushing force, and can avoid the kicking tube phenomenon at the distal end of the pushing rod 2, which is convenient for use during surgery; at the same time, it can avoid the phenomenon of pushing delay, that is, the movements of the distal and proximal ends of the pushing rod 2 are consistent, thereby improving the pushing stability of the implant pushing system 10, 10a; in addition, it can improve the torsional performance of the distal end of the pushing rod 2, improve the delivery of the pushing rod 2, and at the same time, avoid the fracture of the distal end of the pushing rod 2 when subjected to a large torsional force, thereby improving the overall pushing stability of the implant pushing system 10, 10a and reducing surgical risks.

[0056] The utility model has been described by the above-mentioned relevant embodiments, but the above-mentioned embodiments are only examples for implementing the utility model. In addition, the technical features involved in the different embodiments of the utility model described above can be combined with each other as long as they do not conflict with each other. It must be pointed out that the utility model can also have many other embodiments. Without departing from the spirit and essence of the utility model, technicians familiar with the field can make various corresponding changes and deformations according to the utility model, but these corresponding changes and deformations should all belong to the protection scope of the claims attached to the utility model.

Claims

1. An implant pushing system, comprising an implant and a pushing rod for pushing the implant; characterized in that: The push rod is a hollow tube, and the push rod has a distal tube body located at the distal end; along the axial direction of the push rod, a plurality of through groove groups are arranged at intervals on the distal tube body; from the proximal end of the distal tube body toward the distal end, around the preset circumference of the distal tube body, there is a staggered angle between two adjacent through groove groups, and the staggered angle is 5° to 85°.

2. The implant pushing system according to claim 1, characterized in that: The misalignment angles corresponding to the plurality of through slot groups are consistent.

3. The implant pushing system according to claim 1, characterized in that: The distal tube body includes a first section and a second section connected to the distal end of the first section; the misalignment angle corresponding to the through groove group on the first section is a first misalignment angle, and the misalignment angle corresponding to the through groove group on the second section is a second misalignment angle, and the first misalignment angle is smaller than the second misalignment angle.

4. The implant pushing system according to claim 3, characterized in that: An absolute value of a difference between the first misalignment angle and the second misalignment angle is less than 5°.

5. The implant pushing system according to claim 1, characterized in that: The through groove group includes two through grooves extending along the circumference of the distal tube body and arranged at intervals, and the two through grooves are symmetrically arranged about the center of the circle where the through grooves are located.

6. The implant pushing system according to claim 1, characterized in that: The implant pushing system further comprises a heat shrink tube sleeved on the periphery of the distal end tube body.

7. The implant pushing system according to claim 1, characterized in that: The push rod is one of a stainless steel tube, a nickel-titanium tube, and a cobalt-chromium-nickel alloy tube.

8. The implant pushing system according to any one of claims 1 to 7, characterized in that: The implant is an embolic spring coil connected to the distal end of the push rod; the implant pushing system also includes a release component for separating the embolic spring coil from the push rod.

9. The implant pushing system according to claim 8, characterized in that: The release assembly comprises: A heating tube located between the push rod and the embolization spring coil, wherein the heating tube is a hollow tube, and the distal end of the heating tube is connected to the proximal end of the embolization spring coil; A connecting wire, the connecting wire is passed through the heating tube, one end of the connecting wire is connected to the embolization spring coil, and the other end is connected to the pushing rod, and the heating tube is used to fuse the connecting wire; A power supply component, the power supply component includes a first wire that passes through the push rod and is connected to the heating tube, and a second wire that is connected to the heating tube, one of the first wire and the second wire is used to connect to the positive pole of the external power supply, and the other is used to connect to the negative pole of the external power supply.

10. The implant pushing system according to any one of claims 1 to 7, characterized in that: The implant is an implant bracket which is engaged with the distal end of the distal tube body.

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