Implant release system and embolism interventional therapy device

Abstract

The invention provides an implant release system and an embolism interventional therapy device, and relates to the field of medical instruments.The implant release system comprises a push rod and a control line, the far end of the push rod is provided with a limiting block, and the limiting block is provided with a first containing cavity and a containing groove used for containing a connecting rod; the pushing rod is further provided with a second containing cavity used for containing the release head, the second containing cavity is located on the near end side of the limiting block, an opening allowing the release head to be disengaged is formed in the radial direction of the second containing cavity, and the orientation of the opening is consistent with the orientation of the containing groove. The control line is located in the hollow cavity of the push rod, and a cushion block is arranged at the far end of the control line. The implant can be smoothly released, the structure is simple, and the release operation is convenient.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to an implant release system and an embolization interventional therapy device. Background Technology

[0002] Embolization interventional surgery is a minimally invasive procedure that falls under the category of interventional vascular therapy. Guided by imaging techniques such as angiography, embolization interventional surgery inserts a catheter into a specific blood vessel or lesion and releases an embolic agent (such as gelatin sponge, coils, microspheres, etc.) to block blood flow and seal the blood supply to the abnormal blood vessel or lesion, thereby achieving the purpose of treating diseases such as bleeding, tumors, and vascular malformations.

[0003] The medical device implants used in embolization interventional procedures can be made of mechanical embolization materials, typically stainless steel, platinum, or nickel-titanium alloys, and may be wrapped with polymer fibers. The delivery or release methods of medical device implants can be categorized as direct-push or detachable.

[0004] Direct-push medical device implants cannot be withdrawn in time if the implantation position is inappropriate, so they are gradually being replaced by retractable medical device implants.

[0005] Release methods for detachable medical device implants include electro-release, hydro-(hydraulic) release, and mechanical release. For electro-release, the stability after failed release is higher than that of hydro- and mechanical release, but the release time is longer, the release area is harder, and the complication rate is higher. For hydro-release, release is rapid with minimal microcatheter tip displacement, facilitating precise implant positioning; however, the water flow impact can cause displacement of the implant. For mechanical release, the release time is short, the catheter tip is stable during release with minimal displacement, and there is no impact force as with hydro-release. A comprehensive comparison shows that mechanical release carries the lowest risk.

[0006] Mechanical release of medical device implants requires the use of a release mechanism. However, existing release mechanisms are complex in structure, cumbersome in release method, and carry the risk of release failure. Summary of the Invention

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

[0008] To achieve the above objectives, the present invention provides the following solution: An implant release system includes an implant comprising a spring coil and a release head connected to the proximal end of the spring coil via a connecting rod. The release system includes a push rod and a control line. The distal end of the push rod is provided with a limit stop, the limit stop having a first receiving cavity and a receiving groove for receiving the connecting rod. The push rod also has a second receiving cavity for receiving the release head, the second receiving cavity being located on the proximal side of the limit stop. The second receiving cavity has an opening in the radial direction for the release head to dislodge, the opening facing the same direction as the receiving groove. The control line is located within the hollow cavity of the push rod, and a pad is provided at the distal end of the control line. When not released, the pad is located in the first receiving cavity, and the end face of the pad facing the release head is an inclined surface that gradually moves radially away from the receiving groove from far to near. During release, the control line drives the pad to move proximally, pushing the release head out of the second receiving cavity through the opening.

[0009] As one embodiment, it also includes a protective sleeve, which is slidably sleeved outside the limiting stop and the second receiving cavity. The protective sleeve is connected to a control component, which is used to drive the protective sleeve to slide axially.

[0010] In one embodiment, the control component includes a connecting wire, one end of which is connected to the sheath and the other end of which is connected to the control wire.

[0011] As one embodiment, the push rod has a slit on the tube wall located near the receiving cavity for the connecting wire to pass through.

[0012] As one embodiment, the hollow cavity has a fixing groove for fixing the control line, and the push rod has a breakable part, the position of which corresponds to the position of the fixing groove in the axial direction.

[0013] As one embodiment, the easily broken portion is a groove or a reduced diameter section provided on the outer wall of the push rod.

[0014] As one embodiment, the control line is made of nickel-titanium alloy.

[0015] The present invention also provides an embolization interventional treatment device, including an implant and a release system as described above. The implant includes a spring coil and a release head connected to the proximal end of the spring coil via a connecting rod. When not released, the release head and the spring coil are respectively located on the proximal and distal sides of a limiting stop in the release system, and the connecting rod is located in a receiving groove on the limiting stop.

[0016] In one embodiment, the release head is spherical or cylindrical, and a slot is provided on the upper side of the release head for the control line to pass through.

[0017] As one embodiment, it also includes a catheter disposed outside the implant and the push rod for delivering the implant and the release system into the body.

[0018] The present invention has the following technical advantages over the prior art: This invention facilitates implant release by providing a second receiving cavity at the end of the push rod, with a radially oriented opening within the cavity. Furthermore, by incorporating a pad along the control line, the inclined surface of the pad forces the release head out of the second receiving cavity when the control line is pulled, ensuring smooth implant release and preventing release failure. Additionally, the release system of this invention has a simple structure, low manufacturing cost, and is easy to operate, thus improving the efficiency of interventional procedures.

[0019] The technical effects that other technical solutions in this invention can achieve compared with the prior art are described in detail in specific embodiments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the cooperation structure between the push rod and the implant in one embodiment of the present invention; Figure 2 This is a schematic diagram showing the contact state between the pad and the release head in one embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the release of the implant in one embodiment of the present invention; Figure 4 This is a schematic diagram illustrating the cooperation between the sheath, the limiting stop, and the release head in one embodiment of the present invention; Figure 5 This is a schematic diagram showing the movement of the sheath and pad towards the proximal end in one embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the release of the implant from the sheath in one embodiment of the present invention; Figure 7 This is a schematic diagram of a release head with a slot in one embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the proximal end of the push rod in one embodiment of the present invention (partial cross-section of a portion of the location).

[0022] Explanation of reference numerals in the attached figures: 1. Implant; 11. Spring coil; 12. Connecting rod; 13. Release head; 131. Groove; 2. Release system; 21. Push rod; 211. Limit stop; 212. First receiving cavity; 213. Receiving groove; 214. Second receiving cavity; 215. Fixing groove; 216. Easily broken part; 217. Gap; 22. Control line; 23. Pad; 24. Sheath; 25. Connecting line. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide an implant release system and an embolization interventional therapy device to solve the problems existing in the prior art, ensure the smooth release of the implant, and have a simple structure and convenient release operation.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1: like Figures 1-8As shown, this embodiment provides a release system 2 for an implant 1. The implant 1 includes a spring coil 11 and a release head 13 connected to the proximal end of the spring coil 11 via a connecting rod 12. The release system 2 includes a push rod 21 and a control line 22. A limit stop 211 is provided at the distal end of the push rod 21. The limit stop 211 has a first receiving cavity 212 and a receiving groove 213 for receiving the connecting rod 12. The axial length of the receiving groove 213 is slightly greater than the length of the connecting rod 12. This embodiment uses the location of the receiving groove 213 as the top of the limit stop 211 as an example for explanation. The limit stop 211 can be M-shaped, and the contours of the two side walls of the limit stop 211 can be arc-shaped, and this arc shape is coaxial with the circumferential side wall of the push rod 21. In this embodiment, the push rod 21 is a tubular structure. The push rod 21 has a second receiving cavity 214 for accommodating the release head 13. The axial dimension of the second receiving cavity 214 is slightly larger than the size of the release head 13. The second receiving cavity 214 is located on the proximal side of the limiting stop 211. The second receiving cavity 214 has an opening in the radial direction for the release head 13 to dislodge. The orientation of the opening is consistent with the orientation of the receiving groove 213. The control line 22 is located in the hollow cavity of the push rod 21. A pad 23 is provided at the distal end of the control line 22. When the implant 1 is not released, the pad 23 is located in the first receiving cavity 212. The end face of the pad 23 facing the release head 13 (the top surface of the pad 23) is an inclined surface that gradually moves away from the receiving groove 213 in the radial direction from far to near (i.e., the height gradually decreases). When released, the control line 22 moves the pad 23 proximally, pushing the release head 13 out of the opening into the second receiving cavity 214.

[0027] In this embodiment, the proximal direction is the direction closer to the surgeon, and the distal direction is the direction farther from the surgeon (closer to the patient).

[0028] 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 receiving cavity 212, the release head 13 in the implant 1 is located in the second receiving cavity 214, the connecting rod 12 is located in the receiving groove 213, and the spring coil 11 is located on the distal side of the limit stop 211. Figure 1 As shown. The push rod 21 and implant 1 are inserted into the 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 due to the limiting effect of the catheter. When the limiting stop 211 and the release head 13 protrude from the distal end of the catheter, the release head 13 disengages from the opening into the second receiving cavity 214, and the implant 1 is released. If the implant 1 is not released, it may be due to friction between the connecting rod 12 and the receiving groove 213, or friction between the release head 13 and the limiting stop 211 and the push rod 21, or other resistance preventing the implant 1 from being released. In this case, the control line 22 is pulled towards the proximal side, causing the control line 22 to move the pad 23 synchronously towards the proximal side. During the movement, the inclined surface of the pad 23 contacts the release head 13, such as... Figure 2As shown, the release head 13 moves upward along the inclined plane, the connecting rod 12 disengages from the receiving groove 213, and the release head 13 gradually disengages from the opening into the second receiving cavity 214, thus releasing the implant 1. Figure 3 As shown.

[0029] Therefore, this embodiment, by providing a second receiving cavity 214 at the end of the push rod 21 and having a radially oriented opening on the second receiving cavity 214, facilitates the release of the implant 1. Furthermore, this embodiment also provides a pad 23 on the control line 22, which allows the release head 13 to be squeezed out of the second receiving cavity 214 by the inclined surface of the pad 23 when the control line 22 is pulled, ensuring smooth release of the implant 1 and avoiding release failure. In addition, the release system 2 in this embodiment has a simple structure, low manufacturing cost, and is easy to operate, which helps improve the efficiency of interventional surgery.

[0030] This embodiment also includes a sheath 24. When the implant 1 is not released, the sheath 24 is slidably sleeved outside the limiting stop 211 and the second receiving cavity 214, which can restrict the movement of the release head 13 and prevent the implant 1 from being released in the designated position. The sheath 24 is connected to a control component, which is used to drive the sheath 24 to slide along the axial direction. After the implant 1 reaches the designated position, the control component pulls the sheath 24 to the proximal side, so that the sheath 24 loses its restrictive effect on the release head 13, and the implant 1 can be released. The control line 22 can be used to pull the pad 23 to assist the implant 1 in being released.

[0031] As a specific structural form, in this embodiment, the control component includes a connecting line 25, one end of which is connected to the sheath 24, and the other end is connected to the control line 22, such as... Figure 4 As shown; when the control line 22 is pulled, the sheath 24 and the pad 23 can move synchronously. It should be noted that when the structure in which the sheath 24 and the pad 23 can move synchronously is adopted, the pad 23 should be located on the far side of the sheath 24 to ensure that the sheath 24 loses its restrictive effect on the release head 13 first, and then the pad 23 squeezes the release head 13 to release the implant 1.

[0032] In order to prevent the side wall of the push rod 21 from obstructing the connecting line 25, in this embodiment, a slit 217 is provided on the tube wall of the push rod 21 located on the near end side of the receiving cavity for the connecting line 25 to pass through (the near end side of the push rod 21 in the figure is partially cut to show the position and structural diagram of the control line 22 and the connecting line 25).

[0033] In this embodiment, the hollow cavity has a fixing groove 215 that can fix the control line 22, ensuring that the control line 22 and the push rod 21 remain relatively fixed during the insertion of the implant 1. The push rod 21 has a breakable part 216, the position of which corresponds to the position of the fixing groove 215 in the axial direction. After the implant 1 reaches the designated position, the surgeon breaks the push rod 21 from the breakable part. After the push rod 21 is broken, it is divided into two parts, proximal and distal. By pulling the proximal part, the control line 22 and the pad 23 can be moved towards the proximal side, thereby releasing the implant 1.

[0034] In this embodiment, the easily breakable part 216 is a groove, a reduced diameter section, or other easily breakable structure provided on the outer wall of the push rod 21, such as... Figure 8 As shown.

[0035] In this embodiment, the control line 22 is made of nickel-titanium alloy or other materials.

[0036] Example 2: This embodiment provides an embolization interventional treatment device, including an implant 1 and a release system 2 as described in Embodiment 1. The implant 1 includes a spring coil 11 and a release head 13 connected to the proximal end of the spring coil 11 via a connecting rod 12. When not released, the release head 13 and the spring coil 11 are located on the proximal and distal ends of the limiting stop 211 in the release system 2, respectively. The connecting rod 12 is located in the receiving groove 213 on the limiting stop 211, and the release head 13 is located in the second receiving cavity 214.

[0037] In this embodiment, the release head 13 is spherical or cylindrical, and a slot 131 for the control line 22 to pass through is provided on the upper side of the release head 13. The slot 131 is located at the bottom of the release head 13. Figure 7 As shown; when the release head 13 is disengaged from the second receiving cavity 214 under the action of the pad 23, the control line 22 can be disengaged from the slot 131.

[0038] This embodiment also includes a catheter, which is disposed outside the implant 1 and the push rod 21, for delivering the implant 1 and the release system 2 into the body.

[0039] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0040] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A release system for an implant, characterized in that the implant includes a spring coil and a release head connected to the proximal end of the spring coil via a connecting rod; The release system includes: A push rod, the distal end of which is provided with a limit stop, the limit stop having a first receiving cavity and a receiving groove for receiving the connecting rod, the push rod also having a second receiving cavity for receiving the release head, the second receiving cavity being located on the proximal side of the limit stop, the second receiving cavity having an opening in the radial direction for the release head to dislodge, the opening being oriented in the same direction as the receiving groove; The control line is located in the hollow cavity of the push rod. A pad is provided at the far end of the control line. When not released, the pad is located in the first receiving cavity. The end face of the pad facing the release head is an inclined surface that gradually moves away from the receiving groove in the radial direction from far to near. When released, the control line drives the pad to move towards the near end, pushing the release head out of the second receiving cavity from the opening.

2. The implant release system according to claim 1, characterized in that it further includes a sheath, the sheath being slidably sleeved outside the limiting stop and the second receiving cavity, the sheath being connected to a control component, the control component being used to drive the sheath to slide axially.

3. The implant release system according to claim 2, characterized in that the control component includes a connecting line, one end of which is connected to the sheath and the other end of which is connected to the control line.

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

5. The implant release system according to any one of claims 1 to 4, characterized in that the hollow cavity has a fixing groove for fixing the control line, the push rod has a breakable portion, and the position of the breakable portion corresponds to the position of the fixing groove in the axial direction.

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

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

8. An embolization interventional therapy device, characterized in that, The device includes an implant and a release system as described in any one of claims 1 to 7. The implant includes a spring coil and a release head connected to the proximal end of the spring coil via a connecting rod. When not released, the release head and the spring coil are located on the proximal and distal ends of a limiting stop in the release system, respectively, and the connecting rod is located in a receiving groove on the limiting stop.

9. The embolization interventional therapy device according to claim 8, characterized in that, The release head is spherical or cylindrical, and a slot is provided on the upper side of the release head for the control line to pass through.

10. The embolization interventional treatment device according to claim 9, characterized in that it further includes a catheter disposed outside the implant and the push rod for delivering the implant and the release system into the body.

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