A release system for an implant and an embolization interventional device

Abstract

The application provides a releasing system of an implant and an embolism interventional treatment device, relates to the field of medical instruments, and comprises a pushing rod and a control line, a limiting stopper is arranged at the distal end of the pushing rod, the limiting stopper is provided with a first accommodating cavity and an accommodating groove for accommodating a connecting rod, the pushing rod is further provided with a second accommodating cavity for accommodating a releasing head, the second accommodating cavity is located at the proximal end side of the limiting stopper, the second accommodating cavity is provided with an opening for the releasing head to escape in the radial direction, the direction of the opening is consistent with the direction of the accommodating groove, the control line is located in the hollow cavity of the pushing rod, and a pad is arranged at the distal end of the control line; the application can guarantee the smooth releasing of the implant, and has the advantages of simple structure and convenient releasing operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a release system of an implant and an embolization interventional treatment device. BACKGROUND

[0002] Embolization interventional surgery is a minimally invasive surgery, which belongs to the category of vascular interventional treatment. Embolization interventional surgery is guided by imaging techniques such as angiography, a catheter is inserted into a specific blood vessel or lesion, and embolic agents (such as gelatin sponge, spring coil, microsphere, etc.) are released to block the blood flow to occlude the blood vessels of abnormal blood vessels or lesions, so as to achieve the purpose of treating diseases such as hemorrhage, tumor, vascular malformation, etc.

[0003] The medical device implant used in embolization interventional surgery can be a mechanical embolic material, which is generally made of stainless steel, platinum or nickel-titanium alloy, and can be wound with high molecular fiber. The delivery or release mode of the medical device implant can be divided into straight push type and detachable type.

[0004] The straight push type medical device implant cannot be withdrawn in time when the implant position is not suitable, so it is gradually replaced by the detachable medical device implant.

[0005] The detachment mode of the detachable medical device implant includes electrolytic detachment, water (hydraulic) detachment and mechanical detachment. For the electrolytic detachment medical device implant, its stability after detachment failure is higher than that of water detachment and mechanical detachment, but its detachment time is longer, the texture of the detachment area is hard, and the incidence of complications is higher. For the water detachment medical device implant, its detachment is rapid and the microcatheter head is slightly offset during detachment, so that the precise positioning of the medical device implant can be easily achieved, but the water flow impact will have a displacement effect on the implanted medical device implant. For the mechanical detachment medical device implant, its detachment time is short, the catheter head end is stable during detachment, and the displacement is small, without the impact force generated by the water detachment method. After comprehensive comparison, it can be seen that the mechanical detachment method has the smallest risk.

[0006] The mechanical detachment medical device implant needs to be used with a release mechanism, but the existing release mechanism has a complex structure, a cumbersome release method, and a risk of detachment failure. SUMMARY

[0007] The purpose of the present application is to provide a release system of an implant and an embolization interventional treatment device to solve the problems existing in the prior art, which can ensure the smooth release of the implant, and has a simple structure and convenient release operation.

[0008] To achieve the above purpose, the present application provides the following solutions:

[0009] A releasing system of an implant, the implant comprising a spring coil and a releasing head connected to a proximal end of the spring coil through a connecting rod; the releasing system comprising a pushing rod and a control wire, a limiting stopper is arranged at a distal end of the pushing rod, the limiting stopper is provided with a first accommodating cavity and an accommodating slot for accommodating the connecting rod, the pushing rod is further provided with a second accommodating cavity for accommodating the releasing head, the second accommodating cavity is located at a proximal end side of the limiting stopper, the second accommodating cavity is provided with an opening for the releasing head to exit in a radial direction, and the opening is consistent with the accommodating slot in a direction; the control wire is located in a hollow cavity of the pushing rod, a pad is arranged at a distal end of the control wire, the pad is located in the first accommodating cavity when not released, and an end surface of the pad facing the releasing head is a bevel gradually away from the accommodating slot in a radial direction from distal to proximal, when released, the control wire drives the pad to move proximally, and the releasing head is ejected from the opening out of the second accommodating cavity.

[0010] As an embodiment, a sheath is further included, the sheath is sleeved on the outside of the limiting stopper and the second accommodating cavity, and a control assembly is connected to the sheath, the control assembly is used for driving the sheath to slide in an axial direction.

[0011] As an embodiment, the control assembly comprises a connecting wire, one end of the connecting wire is connected to the sheath, and the other end of the connecting wire is connected to the control wire.

[0012] As an embodiment, a slit is arranged on a tube wall of the pushing rod at a proximal end side of the accommodating cavity, and the slit is used for the connecting wire to pass through.

[0013] As an embodiment, the hollow cavity is provided with a fixing slot capable of fixing the control wire, and the pushing rod is provided with a breakable part, and the position of the breakable part corresponds to the position of the fixing slot in an axial direction.

[0014] As an embodiment, the breakable part is a cutting groove or a reduced diameter section arranged on an outer wall of the pushing rod.

[0015] As an embodiment, the control wire is made of nickel-titanium alloy.

[0016] The application further provides an embolization interventional treatment device, comprising an implant and a releasing system as described above, the implant comprising a spring coil and a releasing head connected to a proximal end of the spring coil through a connecting rod, when not released, the releasing head and the spring coil are located at a proximal end side and a distal end side of a limiting stopper in the releasing system respectively, and the connecting rod is located in an accommodating slot on the limiting stopper.

[0017] As an embodiment, the releasing head is spherical or columnar, and a slot is arranged on an upper side of the releasing head and used for penetrating the control wire.

[0018] As an embodiment, a catheter is further included, which is arranged outside the implant and the push rod, and is used to deliver the implant and the release system into the body.

[0019] The present application has the following technical effects relative to the prior art:

[0020] The present application is more convenient for releasing the implant by arranging a second accommodating cavity at the end of the push rod and arranging a radial opening on the second accommodating cavity, and the present application can extrude the release head out of the second accommodating cavity by using the inclined surface of the pad when the control line is pulled, so as to ensure the smooth release of the implant and avoid the failure of releasing the implant. In addition, the release system in the present application has simple structure, low manufacturing cost and convenient operation, which is beneficial to improving the efficiency of interventional surgery.

[0021] The technical effects that can be achieved by other technical solutions in the present application relative to the prior art are described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 The figure is a cooperation structure diagram of the push rod and the implant in an embodiment of the present application;

[0024] Figure 2 The figure is a contact state diagram of the pad and the release head in an embodiment of the present application;

[0025] Figure 3 The figure is a release completion diagram of the implant in an embodiment of the present application;

[0026] Figure 4 The figure is a cooperation diagram of the sheath, the limiting stop and the release head in an embodiment of the present application;

[0027] Figure 5 The figure is a diagram of the sheath and the pad moving to the proximal side in an embodiment of the present application;

[0028] Figure 6 The figure is a release completion diagram of the implant disengaging from the sheath in an embodiment of the present application;

[0029] Figure 7 The figure is a structure diagram of the release head having a slot in an embodiment of the present application;

[0030] Figure 8 Fig. 1 is a schematic view of the structure of the proximal end side of the push rod in one embodiment of the present application (partly positionally partially cutaway).

[0031] Explanation of reference numerals:

[0032] 1, implant; 11, spring ring; 12, connecting rod; 13, release head; 131, slotted groove;

[0033] 2, release system; 21, push rod; 211, limiting stop; 212, first accommodating cavity; 213, accommodating groove; 214, second accommodating cavity; 215, fixing groove; 216, easily broken part; 217, gap; 22, control line; 23, pad; 24, sheath; 25, connecting line. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] The purpose of the present application is to provide an implant release system and an embolization interventional therapy device, so as to solve the problems existing in the prior art, ensure the smooth release of the implant, and have simple structure and convenient release operation.

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0037] Embodiment 1:

[0038] As Figures 1-8As shown, the embodiment provides a release system 2 of an implant 1, the implant 1 comprising a spring ring 11 and a release head 13 connected to the proximal end of the spring ring 11 through a connecting rod 12. The release system 2 comprises a push rod 21 and a control line 22, the distal end of the push rod 21 is provided with a limiting block 211, the limiting block 211 is provided with a first accommodating cavity 212 and an accommodating groove 213 for accommodating the connecting rod 12, the axial length of the accommodating groove 213 is slightly larger than the length of the connecting rod 12. The embodiment takes the top of the limiting block 211 as an example for description. The limiting block 211 can be M-shaped, the two side walls of the limiting block 211 can be arc-shaped, and the arc shape is coaxial with the circumferential side wall of the push rod 21. The push rod 21 in the embodiment is a tubular structure. The push rod 21 is provided with a second accommodating cavity 214 for accommodating the release head 13, the axial size of the second accommodating cavity 214 is slightly larger than the size of the release head 13, the second accommodating cavity 214 is located on the proximal end side of the limiting block 211, the second accommodating cavity 214 is provided with an opening for the release head 13 to escape in the radial direction, the opening is consistent with the direction of the accommodating groove 213; the control line 22 is located in the hollow cavity of the push rod 21, and the distal end of the control line 22 is provided with a pad 23. When the implant 1 is not released, the pad 23 is located in the first accommodating cavity 212, the end face of the pad 23 (the top surface of the pad 23) is inclined away from the accommodating groove 213 (i.e. the height gradually decreases) from the distal end to the proximal end in the radial direction, and when released, the control line 22 drives the pad 23 to move towards the proximal end, and the release head 13 is pushed out of the second accommodating cavity 214 from the opening.

[0039] In the embodiment, the proximal direction is the direction close to the operator, and the distal direction is the direction away from the operator (close to the patient).

[0040] In use, the control line 22 is located in the hollow cavity of the push rod 21, the pad 23 is located in the first accommodating cavity 212, the release head 13 in the implant 1 is located in the second accommodating cavity 214, the connecting rod 12 is located in the accommodating groove 213, and the spring ring 11 is located on the distal end side of the limiting block 211, as shown. Figure 1 The push rod 21 and the implant 1 are placed into the human body through a catheter (not shown in the figure), when the release head 13 is not pushed out of the catheter, the implant 1 will not be released under the limiting action of the catheter, when the limiting block 211 and the release head 13 are exposed from the distal end of the catheter, the release head 13 escapes from the second accommodating cavity 214 through the opening, and the implant 1 is released. If the implant 1 is not released, it may be that the friction between the connecting rod 12 and the accommodating groove 213 or the friction between the release head 13 and the limiting block 211 and the push rod 21 or other resistance prevents the implant 1 from being released, then the control line 22 is pulled towards the proximal end, so that the control line 22 drives the pad 23 to move towards the proximal end at the same time; during the movement of the pad 23, the inclined surface of the pad 23 is in contact with the release head 13, as shown. Figure 2As shown, the release head 13 is moved upward along the slope, the connecting rod 12 is disengaged from the accommodating groove 213, and the release head 13 is gradually disengaged from the second accommodating cavity 214 through the opening, so as to achieve the release of the implant 1. Figure 3 As shown.

[0041] Therefore, the second accommodating cavity 214 is arranged at the end of the push rod 21, and the opening facing the radial direction is arranged on the second accommodating cavity 214, so that the release of the implant 1 is more convenient. In addition, the pad 23 is arranged on the control line 22, so that the release head 13 is extruded out of the second accommodating cavity 214 by the slope of the pad 23 when the control line 22 is pulled, so as to ensure the smooth release of the implant 1 and avoid the failure of the release of the implant 1. In addition, the release system 2 in the embodiment has the advantages of simple structure, low manufacturing cost, convenient operation, and high efficiency of interventional surgery.

[0042] In the embodiment, the sheath 24 is arranged to slide on the outside of the limiting block 211 and the second accommodating cavity 214 when the implant 1 is not released, so as to limit the movement of the release head 13 and avoid the release of the implant 1 at a designated position. The sheath 24 is connected with a control assembly, and the control assembly is used to drive the sheath 24 to slide in the axial direction. After the implant 1 reaches the designated position, the sheath 24 is pulled to the proximal side by the control assembly, so that the sheath 24 loses the limiting effect on the release head 13, and the implant 1 can be released. The pad 23 can be pulled by the control line 22 to assist the release of the implant 1.

[0043] As a specific structure, the control assembly in the embodiment includes a connecting line 25, one end of the connecting line 25 is connected with the sheath 24, and the other end of the connecting line 25 is connected with the control line 22, as shown. Figure 4 When the control line 22 is pulled, the sheath 24 and the pad 23 can be synchronously moved. It should be noted that when the sheath 24 and the pad 23 are synchronously moved, the pad 23 is located on the distal side of the sheath 24, so that the sheath 24 loses the limiting effect on the release head 13 first, and then the release head 13 is extruded by the pad 23 to release the implant 1.

[0044] In order to avoid the side wall of the push rod 21 from hindering the connecting line 25, a gap 217 is arranged on the tube wall of the push rod 21 on the proximal side of the accommodating cavity (the proximal side of the push rod 21 is partially cut in the figure, so as to show the position and structure of the control line 22 and the connecting line 25).

[0045] The hollow cavity has a fixing groove 215 capable of fixing the control line 22, which can ensure that the control line 22 and the push rod 21 remain positionally fixed during the implanting process of the implant 1 and the push rod 21. The push rod 21 has a breakable part 216, and the position of the breakable part 216 corresponds to the position of the fixing groove 215 in the axial direction. After the implant 1 reaches the designated position, the operator breaks the push rod 21 at the breakable part, and the push rod 21 is divided into two parts, a proximal part and a distal part. By pulling the proximal part, the control line 22 and the pad 23 can be pulled to move towards the proximal end, thereby releasing the implant 1.

[0046] The breakable part 216 in the embodiment is a groove, a reduced diameter section or other breakable structure arranged on the outer wall of the push rod 21, as shown in the figure. Figure 8

[0047] The material of the control line 22 in the embodiment is nickel-titanium alloy or other materials.

[0048] Embodiment 2:

[0049] The embodiment provides an embolization interventional therapy device, which comprises the implant 1 and the release system 2 in Embodiment 1. The implant 1 comprises a spring coil 11 and a release head 13 connected to the proximal end of the spring coil 11 through a connecting rod 12. When not released, the release head 13 and the spring coil 11 are respectively located on the proximal end side and the distal end side of the limiting stop 211 in the release system 2, the connecting rod 12 is located in the accommodating groove 213 on the limiting stop 211, and the release head 13 is located in the second accommodating cavity 214.

[0050] The release head 13 in the embodiment is spherical or columnar, and the upper side of the release head 13 is provided with a groove 131 for penetrating the control line 22, and the groove 131 is located at the bottom of the release head 13, as shown in the figure. Figure 7 When the release head 13 is separated from the second accommodating cavity 214 under the action of the pad 23, the control line 22 can be separated from the groove 131.

[0051] The embodiment further comprises a catheter, which is arranged outside the implant 1 and the push rod 21, and is used for delivering the implant 1 and the release system 2 into the body.

[0052] Any adaptive changes according to actual needs are within the protection scope of the present application.

[0053] The principles and implementation manners of the present application are described by using specific examples in the present application. The above embodiment is only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the present application. In conclusion, the content of the present description should not be understood as a limitation of the present application.​

Claims

1. An implant release system, characterized in that the implant comprises a spring coil and a release head connected to the proximal end of the spring coil through a connecting rod; the release system comprises: a push rod, the distal end of the push rod is provided with a limiting stopper, the limiting stopper is provided with a first accommodating cavity and an accommodating slot for accommodating the connecting rod, the push rod is further provided with a second accommodating cavity for accommodating the release head, the second accommodating cavity is located on the proximal end side of the limiting stopper, the second accommodating cavity is provided with an opening for the release head to exit in the radial direction, and the direction of the opening is consistent with the direction of the accommodating slot; and a control wire, the control wire is located in the hollow cavity of the push rod, the distal end of the control wire is provided with a pad, when not released, the pad is located in the first accommodating cavity, and the end surface of the pad towards the release head is a slope gradually away from the accommodating slot in the radial direction from distal to proximal, when released, the control wire drives the pad to move proximally, and the release head is ejected from the opening out of the second accommodating cavity.

2. The implant release system according to claim 1, characterized in that it further comprises a sheath, the sheath is sleeved on the outside of the limiting stopper and the second accommodating cavity, and the sheath is connected with a control assembly, the control assembly is used to drive the sheath to slide in the axial direction.

3. The implant release system according to claim 2, characterized in that the control assembly comprises a connecting wire, one end of the connecting wire is connected with the sheath, and the other end is connected with the control wire.

4. The implant release system according to claim 3, characterized in that the tube wall of the push rod on the proximal end side of the accommodating cavity is provided with a gap for the connecting wire to pass through.

5. The implant release system according to any one of claims 1-4, characterized in that the hollow cavity is provided with a fixing slot capable of fixing the control wire, and the push rod is provided with a breakable part, the position of the breakable part corresponds to the position of the fixing slot in the axial direction.

6. The implant release system according to claim 5, characterized in that the breakable part is a cutting groove or a reduced diameter section provided on the outer wall of the push rod.

7. The implant release system according to claim 1, characterized in that the material of the control wire is nickel-titanium alloy.

8. An embolization interventional therapy device, characterized by, An implant and a release system as claimed in any one of claims 1-7, the implant comprises a spring coil and a release head connected to the proximal end of the spring coil through a connecting rod, when not released, the release head and the spring coil are located on the proximal end side and the distal end side of the limiting stopper in the release system respectively, and the connecting rod is located in the accommodating slot on the limiting stopper.

9. Embolisation interventional procedure device according to claim 8, wherein, The release head is spherical or columnar, and the upper side of the release head is provided with a slot for penetrating the control wire.

10. The embolization interventional therapy device according to claim 9, characterized in that it further comprises a catheter, the catheter is arranged outside the implant and the push rod, and is used to deliver the implant and the release system into the body.

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