A mechanical release coil system

Abstract

The present invention discloses a mechanical release spring coil system, comprising a push tube, a release core wire, a release head, a connecting rod and a spring coil, wherein the push tube has a hollow chamber inside, and the distal side wall of the push tube is provided with a positioning groove connected to the hollow chamber, the release head cooperates with the positioning groove under the extrusion of the release core wire to be confined in the hollow chamber, and is separated from the positioning groove after the extrusion of the release core wire disappears, the spring coil is connected to the release head through the connecting rod and is located outside the hollow chamber, the push tube is provided with a plurality of hollow holes near its distal end and is correspondingly provided with an elastic tube and a sleeve, the elastic tube is embedded in the push tube and covers the inner wall of the hollow hole, and the sleeve is wrapped outside the push tube and covers the outer wall of the hollow hole. The present invention minimizes damage to the blood vessel wall while ensuring the flexibility of the distal section of the push tube, reduces the risk of complications such as perforation and tearing, and ensures safe operation.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a mechanical release coil system. Background Art

[0002] As a medical device for treating aneurysms, the coil is mainly made of platinum and other alloy materials, with excellent biocompatibility and plasticity. Its design imitates the shape of a spring and is implanted inside the aneurysm through a minimally invasive surgical approach. It effectively blocks blood circulation through physical packing to prevent aneurysm rupture and bleeding. At present, the coil release technology is mainly divided into two categories: electrolytic release and mechanical release. Electrolytic release technology has a long history. It uses direct current to attract charged particles in the blood to form a thrombus, and uses electric current to dissolve the stainless steel guide wire connected to the coil, thereby achieving the release and permanent retention of the coil. On the contrary, mechanical release technology abandons the reliance on electric current and relies on a sophisticated mechanical structure to release the coil. The release device is manually activated to cut off the guide wire or start the release mechanism to ensure the precise release of the coil. This method is easy to operate and significantly reduces the thermal damage and stimulation of tissues that may be caused by electric current, reducing the risk of complications.

[0003] Whether it is electrical release or mechanical release, the spring coil push structure must be used to complete its precise placement into the aneurysm. Among them, the flexibility of the distal end of the push structure is crucial to the success of the operation and patient safety. In order to improve the flexibility of the push rod, researchers continue to explore innovative materials and structural optimization designs. For example, as disclosed in Chinese utility model patent CN216985016U, flexibility is enhanced by designing staggered opening grooves at the distal end of the push rod. However, although this design improves the flexibility of the push rod, it also increases the potential risk of damage to the blood vessel wall, such as perforation or tearing, which threatens the safety of the operation to a certain extent. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a mechanical release spring coil system in view of the above-mentioned defects in the prior art.

[0005] According to the present invention, a mechanical release spring coil system is provided, comprising a push tube, a release core wire, a release head, a connecting rod and a spring coil, wherein the interior of the push tube has a hollow chamber, and the distal side wall of the push tube is provided with a positioning groove connected to the hollow chamber, the release head cooperates with the positioning groove under the squeezing action of the release core wire to be confined in the hollow chamber, and is separated from the positioning groove after the squeezing action of the release core wire disappears, the spring coil is connected to the release head through the connecting rod and is located outside the hollow chamber, the push tube is provided with a plurality of hollow holes near its distal end and is correspondingly provided with an elastic tube and a sleeve, the elastic tube is embedded in the push tube and covers the inner wall of the hollow hole, and the sleeve is wrapped outside the push tube and covers the outer wall of the hollow hole.

[0006] Furthermore, the hollow hole is a long strip hole, and the length direction of the hollow hole is arranged along the circumference of the push tube.

[0007] Furthermore, the plurality of hollow holes are arranged in a staggered or spiral distribution manner along the axial direction of the push tube.

[0008] Furthermore, the distal end of the release core wire extends out of the distal end of the push tube and then curls to form a coil structure with a radial size larger than the hollow chamber.

[0009] Furthermore, the coil structure is wound around the outside of the connecting rod.

[0010] Furthermore, a limiting cylinder for straightening the release core wire is provided in the hollow chamber, and the release core wire passes through the limiting cylinder and extends out of the distal end of the pushing tube.

[0011] Furthermore, the pushing tube includes a first pushing section located at the proximal end and a second pushing section located at the distal end, and a plurality of hollow holes are arranged on the second pushing section.

[0012] Furthermore, the first pushing section is formed as a reducing tube near its distal end.

[0013] Furthermore, a core wire release handle is provided at the proximal end of the first pushing section, and the proximal end of the core wire release is connected to the core wire release handle.

[0014] Furthermore, a spring group is wound around the distal end of the second pushing section after the distal end of the sleeve extends out, and the positioning groove is located between the sleeve and the spring group.

[0015] Compared with the prior art, the present invention sets a number of hollow holes near the distal end of the push tube to ensure the high flexibility of the distal end of the push tube. At the same time, the outer side is cleverly covered with a sleeve to protect the blood vessel wall, avoiding direct contact between the hollow holes and the blood vessel and causing blood vessel damage. In addition, an elastic tube is also configured inside the hollow hole to further enhance the flexibility of the area, effectively alleviating the limitation of the sleeve on flexibility, thereby ensuring the flexibility of the distal end of the push tube while minimizing damage to the blood vessel wall, reducing the risk of complications such as perforation and tearing, and ensuring safe surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] A more complete understanding of the invention and its attendant advantages and features will be more readily appreciated by referring to the following detailed description taken in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Sectional view at AA.

[0019] Figure 3 yes Figure 1 Schematic diagram of the structure of the push tube.

[0020] Figure 4 It is a structural schematic diagram of the release core wire and the release head in the second embodiment of the present invention.

[0021] In the accompanying drawings: 1 is a push tube, 2 is a release core wire, 3 is a release head, 4 is a connecting rod, 5 is a spring coil, 6 is a positioning groove, 7 is a hollow hole, 8 is an elastic tube, 9 is a sleeve, 10 is a first push section, 11 is a second push section, 12 is a release core wire handle, 13 is a spring group, and 14 is a coil structure.

[0022] It should be noted that the drawings are used to illustrate the present invention, rather than to limit the present invention. Note that the drawings showing the structures may not be drawn to scale. In addition, in the drawings, the same or similar elements are marked with the same or similar reference numerals. DETAILED DESCRIPTION

[0023] In order to make the contents of the present invention clearer and easier to understand, the contents of the present invention are described in detail below in conjunction with specific embodiments and drawings.

[0024] The "proximal end" and "distal end" referred to in the present invention should be understood as being viewed from the direction of the attending physician. The "proximal end" refers to the end close to the attending physician, which corresponds to the "left end" referred to in the reference drawings, and the "distal end" refers to the end away from the attending physician, which corresponds to the "right end" referred to in the reference drawings. Similarly, the "proximal segment" refers to a segment or a specific area close to the attending physician, and the "distal segment" refers to a segment or a specific area away from the attending physician.

[0025] Embodiment 1: Figures 1 to 3 As shown, the mechanical release coil system of this embodiment includes a push tube 1, a release core wire 2, a release head 3, a connecting rod 4 and a spring coil 5. The release core wire 2 restricts the release head 3 in the push tube 1, the proximal end of the connecting rod 4 extends into the push tube 1 and is fixedly connected to the release head 3, and the distal end of the connecting rod 4 extends out of the push tube 1 and is fixedly connected to the spring coil 5. The release core wire 2 is pulled out to separate it from the release head 3, so that the connecting rod 4 and even the spring coil 5 can be released.

[0026] The push tube 1 has a hollow chamber inside. The push tube 1 is a slender pipe, which is designed to ensure that the spring coil 5 can reach the target position safely and accurately, while reducing damage to the surrounding tissue of the blood vessels. The distal side wall of the push tube 1 is provided with a positioning groove 6 connected to the hollow chamber. The spring coil 5 is located outside the hollow chamber. The release head 3 is spherical and has a diameter greater than the width of the positioning groove 6. The release head 3 cooperates with the positioning groove 6 under the squeezing effect of the release core wire 2 to be confined in the hollow chamber, and is separated from the positioning groove 6 after the squeezing effect of the release core wire 2 disappears. In this way, the release head 3 is partially inserted into the positioning groove 6, ensuring that the release head 3 cooperates with the positioning groove 6 to be confined in the hollow chamber to form a limit for the spring coil 5. During the operation, the doctor delivers the spring coil 5 to the location of the aneurysm through the push tube 1. When the spring coil 5 reaches the predetermined position, the doctor then slowly pulls out the release core wire 2, so that the release head 3 is separated from the positioning groove 6 to achieve release. The released spring coil 5 is released and unfolded in the aneurysm, forming a stable embolic structure, blocking blood flow into the aneurysm, reducing the risk of rupture, and promoting thrombosis, ultimately achieving the purpose of treating the aneurysm.

[0027] The push tube 1 is provided with a plurality of hollow holes 7 near its distal end, i.e., the distal section of the push tube 1, and is provided with an elastic tube 8 and a sleeve 9 correspondingly. The elastic tube 8 is embedded in the push tube 1 and covers the inner wall of the hollow hole 7, and the sleeve 9 is wrapped outside the push tube 1 and covers the outer wall of the hollow hole 7. In this embodiment, a plurality of hollow holes 7 are provided near the distal end of the push tube 1 to ensure high flexibility of the distal section of the push tube 1. At the same time, the sleeve 9 is cleverly covered on the outside to protect the blood vessel wall, thereby preventing the hollow holes 7 from directly contacting the blood vessel and causing blood vessel damage. In addition, an elastic tube 8 is also configured inside the hollow hole 7. The elastic tube 8 is a spring tube. The spring tube has good flexibility to adapt to the complex path and dynamic environment of the blood vessel. It usually refers to a type of tubular structure with special shape memory properties. It is mainly made of materials with excellent biocompatibility, such as stainless steel, nickel-titanium alloy, or materials covered with special coatings to adapt to specific needs in medical implants or interventional surgeries. Therefore, the elastic tube 8 can further enhance the flexibility of the area corresponding to the hollow hole 7, and effectively alleviate the limitation of the flexibility of the area caused by the sleeve 9, thereby ensuring the flexibility of the distal section of the push tube 1 while minimizing damage to the blood vessel wall, reducing the risk of complications such as perforation and tearing, and ensuring the safety of the operation.

[0028] The push tube 1 includes a first push section 10 located at the proximal end and a second push section 11 located at the distal end. The first push section 10 is formed into a reducer near its distal end, that is, the distal section of the first push section 10 is connected to the second push section 11 and is a reducer, so as to improve the flexibility of the second push section 11. At the same time, a plurality of hollow holes 7 are arranged on the second push section 11 to ensure the high flexibility of the second push section 11. The hollow holes 7 are long strip holes, and the length direction of the hollow holes 7 is arranged along the circumference of the push tube 1. The plurality of hollow holes 7 in this embodiment are arranged in a staggered distribution along the axial direction of the push tube 1. Of course, they can be arranged in a spiral distribution, which can ensure the high flexibility of the second push section 11. The proximal end of the first push section 10 is provided with a core wire release handle 12, and the proximal end of the core wire release 2 is connected to the core wire release handle 12. The distal end of the core wire release 2 squeezes the release head 3 so that it presses into the positioning groove 6 and extends out of the distal end of the second push section 11. The sleeve 9 is wrapped around the second pushing section 11. The distal end of the second pushing section 11 extends out of the distal end of the sleeve 9 and is wrapped with a spring group 13. The spring group 13 has a developing function. While playing the developing role, it also avoids damage to the surrounding tissues of the blood vessels. The positioning groove 6 is located between the sleeve 9 and the spring group 13.

[0029] Embodiment 2: Different from Embodiment 1, Figure 4 As shown, the distal end of the release core wire 2 of this embodiment extends out of the distal end of the push tube 1 and then curls to form a coil structure 14 whose radial size is larger than the hollow chamber. The coil structure 14 is wound around the outside of the connecting rod 4, and the layout is reasonable, which is conducive to improving the compactness of the structure of the entire system. A limiting structure is formed between the coil structure 14 and the distal end of the push tube 1, which can prevent the release core wire 2 from being pulled out in advance due to operational errors to a certain extent. At the same time, it also solves the problem of misunderstanding and detachment caused by the possible spontaneous retraction of the distal end of the release core wire 2 when the push tube 1 bends in the tortuous blood vessel during the pushing process. Moreover, through the setting of the coil structure 14, the length L of the positioning groove 6 of this embodiment can be greater than 1.5 times the diameter of the release head 3 and less than 2.5 times the diameter of the release head 3, which facilitates the assembly of the release head 3, the release core wire 2, and the positioning groove 6. Under normal circumstances, the length of the positioning groove 6 is only slightly larger than the diameter of the release head 3. If it is too large, the distal end of the release core wire 2 will retract greatly in the tortuous blood vessel wall and separate from the release head 3, so that the release head 3 is separated from the positioning groove 6. In order to smoothly operate the release core wire 2 to release the spring coil 5, the present embodiment provides a limiting cylinder (not shown) in the hollow chamber of the push tube 1 for straightening the release core wire 2. The limiting cylinder can be formed by a local inward depression of the push tube 1, or can be fixed in the push tube 1 by welding or bonding. The release core wire 2 passes through the limiting cylinder and extends out of the distal end of the push tube 1.

[0030] The other structures of this embodiment are consistent with those of the first embodiment and will not be described again here.

[0031] It is to be understood that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A mechanical release spring coil system, comprising a push tube (1), a release core wire (2), a release head (3), a connecting rod (4) and a spring coil (5), wherein the push tube (1) has a hollow chamber inside, and a distal side wall of the push tube (1) is provided with a positioning groove (6) connected to the hollow chamber, the release head (3) cooperates with the positioning groove (6) under the squeezing action of the release core wire (2) to be confined in the hollow chamber, and is released from the positioning groove (6) after the squeezing action of the release core wire (2) disappears, the spring coil (5) is connected to the release head (3) through the connecting rod (4) and is located outside the hollow chamber, characterized in that: The push tube (1) is provided with a plurality of hollow holes (7) near its distal end and is provided with an elastic tube (8) and a sleeve (9) correspondingly. The elastic tube (8) is a spring tube. The elastic tube (8) is embedded in the push tube (1) and covers the inner wall of the hollow hole (7). The sleeve (9) is wrapped around the push tube (1) and covers the outer wall of the hollow hole (7). The distal end of the release core wire (2) extends out of the distal end of the push tube (1) and then curls to form a coil structure (14) having a radial dimension larger than that of the hollow chamber. The coil structure (14) is wound around the outside of the connecting rod (4). The length L of the positioning groove (6) is larger than 1.5 times the diameter of the release head (3) and smaller than 2.5 times the diameter of the release head (3). The head (3) is located at the proximal end of the positioning groove (6) and the connecting rod (4) is arranged at an angle. A limiting cylinder for straightening the release core wire (2) is arranged in the hollow chamber. The release core wire (2) passes through the limiting cylinder and then extends out of the distal end of the push tube (1). The push tube (1) comprises a first push section (10) located at the proximal end and a second push section (11) located at the distal end. A plurality of hollow holes (7) are arranged on the second push section (11). The distal end of the second push section (11) extends out of the distal end of the sleeve (9) and is wound with a spring group (13). The positioning groove (6) and the spring group (13) are both exposed outside the sleeve (9), and the positioning groove (6) is located between the sleeve (9) and the spring group (13).

2. The mechanical release coil system according to claim 1, characterized in that: The hollow hole (7) is a long strip-shaped hole, and the length direction of the hollow hole (7) is arranged along the circumference of the push tube (1).

3. The mechanical release coil system according to claim 1, characterized in that: A plurality of hollow holes (7) are arranged in a staggered or spiral distribution manner along the axial direction of the push tube (1).

4. The mechanical release coil system according to claim 1, characterized in that: The first pushing section (10) is formed into a reducing tube near its distal end.

5. The mechanical release coil system according to claim 1, characterized in that: A core wire release handle (12) is provided at the proximal end of the first pushing section (10), and the proximal end of the core wire release (2) is connected to the core wire release handle (12).

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