Mechanical release spring ring system

Abstract

The mechanical release spring ring system comprises a pushing pipe, a release core wire, a release head, a connecting rod and a spring ring, a hollow cavity is formed in the pushing pipe, and a positioning groove communicating with the hollow cavity is formed in the side wall of the far end of the pushing pipe; the releasing head is matched with the positioning groove under the extrusion action of the releasing core wire so as to be limited in the hollow cavity and is separated from the positioning groove after the extrusion action of the releasing core wire disappears, and the spring ring is connected with the releasing head through a connecting rod and is located outside the hollow cavity; the far end of the releasing core wire extends out of the far end of the pushing pipe and then is curled to form a coil structure with the radial size larger than that of the hollow cavity, the coil structure is wound outside the connecting rod, and a limiting structure is formed between the coil structure and the far end face of the pushing pipe, so that the releasing core wire can be prevented from being pulled out in advance due to misoperation to a certain extent; and the phenomenon of misunderstanding caused by possible spontaneous retraction when the far end of the releasing core wire is bent in the tortuous blood vessel along with the pushing tube in the pushing process is also solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a mechanical detachable coil system. Background Art

[0002] As a medical device for treating aneurysms, a coil is mainly made of platinum and other alloy materials, and has excellent biocompatibility and plasticity. Its design imitates the shape of a spring and is implanted into the aneurysm through a minimally invasive surgical approach. Through physical packing, it effectively blocks blood flow and prevents bleeding caused by aneurysm rupture. Currently, the detachment techniques of coils are mainly divided into two categories: electrolytic detachment and mechanical detachment. The electrolytic detachment technique has a long history. By using direct current to attract charged particles in the blood to form thrombus and using current to dissolve the stainless steel guide wire connecting the coil, the detachment and permanent retention of the coil are achieved. On the contrary, the mechanical detachment technique abandons the dependence on current and relies on a fine mechanical structure to release the coil. By manually activating the detachment device to cut the guide wire or start the detachment mechanism, the coil is accurately released. This method is easy to operate and significantly reduces the tissue thermal damage and irritation that may be caused by current, reducing the risk of complications. However, while being easy to operate, the mechanical detachment technique may also cause misdetachment due to premature removal of the detachment core wire due to operation errors, or spontaneous retraction of the distal end of the detachment core wire along with the pushing tube when it bends in tortuous blood vessels during the pushing process. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a mechanical detachable coil system in view of the above-mentioned defects in the prior art.

[0004] According to the present invention, there is provided a mechanical detachable coil system, including a pushing tube, a detachment core wire, a detachment head, a connecting rod, and a coil. The inside of the pushing tube has a hollow chamber, and a positioning groove communicating with the hollow chamber is provided on the distal side wall of the pushing tube. Under the extrusion of the detachment core wire, the detachment head cooperates with the positioning groove to be restricted in the hollow chamber and disengages from the positioning groove after the extrusion of the detachment core wire disappears. The coil is connected to the detachment head through the connecting rod and is located outside the hollow chamber. The distal end of the detachment core wire extends out of the distal end of the pushing tube and curls to form a coil structure with a radial dimension larger than that of the hollow chamber. The coil structure winds around the outside of the connecting rod and forms a limiting structure between the distal end face of the pushing tube.

[0005] Further, the length of the positioning groove is greater than 1.5 times the diameter of the detachment head and less than 2.5 times the diameter of the detachment head.

[0006] Further, the detachment head is located at the proximal end of the positioning groove and the connecting rod is inclined.

[0007] Further, the detachment head is spherical.

[0008] Further, the proximal end of the connecting rod extends into the pushing tube and is fixedly connected to the release head, and the distal end extends out of the pushing tube and is fixedly connected to the coil.

[0009] Further, a limiting cylinder for straightening the release core wire is provided in the hollow chamber. The release core wire passes through the limiting cylinder and curls to form the coil structure after extending out of the distal end of the pushing tube.

[0010] Further, the coil structure is formed into one turn.

[0011] Further, the limiting cylinder is formed by a partial inward depression of the pushing tube.

[0012] Further, the limiting cylinder is fixed in the pushing tube by welding or bonding.

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

[0014] Compared with the prior art, the distal end of the release core wire of the present invention extends out of the distal end of the pushing tube and curls to form a coil structure with a radial dimension larger than the hollow chamber. The coil structure is wound around the outside of the connecting rod, with a reasonable layout, which is beneficial to improving the structural compactness of the whole system. Moreover, a limiting structure is formed between the coil structure and the distal end of the pushing tube, which can prevent the premature extraction of the release core wire due to operation errors to a certain extent. At the same time, it also solves the problem of misrelease phenomenon caused by the possible spontaneous retraction of the distal end of the release core wire when it bends in the tortuous blood vessel along with the pushing tube during the pushing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Combined with the accompanying drawings and by referring to the following detailed description, it will be easier to have a more complete understanding of the present invention and easier to understand its accompanying advantages and features.

[0016] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present invention.

[0017] Figure 2 is Figure 1 the cross-sectional view taken along line A-A in

[0018] Figure 3 is Figure 1 the structural schematic diagram of the pushing tube in

[0019] Figure 4 is the structural schematic diagram of the release core wire and the release head in Embodiment 2 of the present invention.

[0020] 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.

[0021] It should be noted that the accompanying drawings are used to illustrate the present invention, rather than to limit the present invention. Note that the drawings showing the structure may not be drawn to scale. And in the accompanying drawings, the same or similar elements are labeled with the same or similar reference numerals. Detailed implementation manners

[0022] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0023] As used in the present invention, "proximal end" and "distal end" should be understood as follows: when observed from the direction of the attending physician, the "proximal end" refers to the end close to the attending physician, that is, the "left end" corresponding to the reference accompanying drawings, and the "distal end" refers to the end far from the attending physician, that is, the "right end" corresponding to the reference accompanying 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 far from the attending physician.

[0024] Example 1: As Figures 1 to 3 shown, the mechanical release spring 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 within 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. The distal end of the connecting rod 4 extends out of the push tube 1 and is fixedly connected to the spring coil 5. By pulling out the release core wire 2 to separate it from the release head 3, the release of the connecting rod 4 and even the spring coil 5 can be achieved.

[0025] The interior of the delivery tube 1 has a hollow chamber. The delivery tube 1 is a slender pipe designed to ensure that the coil 5 can reach the target position safely and accurately while reducing damage to the surrounding vascular tissue. The distal side wall of the delivery tube 1 is provided with positioning grooves 6 communicating with the hollow chamber. The coil 5 is located outside the hollow chamber. The detaching head 3 is spherical and has a diameter larger than the width of the positioning groove 6. Under the extrusion of the detaching core wire 2, the detaching head 3 cooperates with the positioning groove 6 to be restricted within the hollow chamber and disengages from the positioning groove 6 after the extrusion of the detaching core wire 2 disappears. In this way, a part of the detaching head 3 is inserted into the positioning groove 6, ensuring that the detaching head 3 cooperates with the positioning groove 6 to be restricted within the hollow chamber to form a limit for the coil 5. During the operation, the doctor delivers the coil 5 to the position of the aneurysm through the delivery tube 1. When the coil 5 reaches the predetermined position, the doctor then slowly withdraws the detaching core wire 2, causing the detaching head 3 to disengage from the positioning groove 6, thus achieving detachment. The detached coil 5 is released and deployed within the aneurysm, forming a stable embolization structure, blocking blood flow into the aneurysm, reducing the risk of rupture, and promoting thrombus formation, ultimately achieving the purpose of treating the aneurysm.

[0026] Near the distal end of the delivery tube 1, that is, in the distal section of the delivery tube 1, a number of hollow holes 7 are provided, and an elastic tube 8 and a sleeve 9 are correspondingly arranged. The elastic tube 8 is embedded in the delivery tube 1 and covers the inner wall of the hollow hole 7, and the sleeve 9 is wrapped outside the delivery tube 1 and covers the outer wall of the hollow hole 7. In this embodiment, a number of hollow holes 7 are provided at the position of the delivery tube 1 close to the distal end to ensure the high flexibility of the distal section of the delivery tube 1. At the same time, the sleeve 9 is cleverly covered on the outside to protect the blood vessel wall, avoiding the direct contact between the hollow hole 7 and the blood vessel, which may cause blood vessel damage. In addition, an elastic tube 8 is arranged 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 kind of tubular structure with special shape memory characteristics, mainly made of materials with excellent biocompatibility, such as stainless steel, nickel-titanium alloy or materials coated with special coatings, to meet the specific requirements in medical implantation or interventional surgery. Therefore, the elastic tube 8 can further enhance the flexibility of the corresponding area of the hollow hole 7, effectively alleviating the limitation of the flexibility of this area that the sleeve 9 may cause, thereby ensuring the flexibility of the distal section of the delivery tube 1 while minimizing damage to the blood vessel wall and reducing the risk of complications such as perforation and tearing, ensuring the safe progress of the operation.

[0027] The pushing tube 1 includes a first pushing section 10 at the proximal end and a second pushing section 11 at the distal end. The first pushing section 10 is formed as a stepped tube near its distal end, that is, the distal section of the first pushing section 10 is connected to the second pushing section 11 and is a stepped section, so as to improve the flexibility of the second pushing section 11. At the same time, a plurality of hollow holes 7 are provided on the second pushing section 11 to ensure the high flexibility of the second pushing section 11. The hollow holes 7 are long strip holes, and the length direction of the hollow holes 7 is arranged along the circumferential direction of the pushing tube 1. In this embodiment, the plurality of hollow holes 7 are arranged in a staggered distribution along the axial direction of the pushing tube 1. Of course, they can be arranged in a spiral distribution, which can ensure the high flexibility of the second pushing section 11. A release core wire handle 12 is provided at the proximal end of the first pushing section 10. The proximal end of the release core wire 2 is connected to the release core wire handle 12. The distal end of the release core wire 2 presses the release head 3 so that it abuts into the positioning groove 6 and extends out of the distal end of the second pushing section 11. The sleeve 9 is wrapped around the second pushing section 11. A spring group 13 is wound around the distal end of the second pushing section 11 after the distal end of the second pushing section 11 extends out of the distal end of the sleeve 9. The spring group 13 has a radiopaque function. While playing a radiopaque role, it also avoids damage to the tissues around the blood vessel. The positioning groove 6 is located between the sleeve 9 and the spring group 13.

[0028] Embodiment 2: Different from Embodiment 1, as Figure 4 shown, the distal end of the release core wire 2 of this embodiment curls to form a coil structure 14 with a radial dimension larger than the hollow chamber after extending out of the distal end of the pushing tube 1. The coil structure 14 is wound around the outside of the connecting rod 4, with a reasonable layout, which is beneficial to improving the structural compactness of the whole system. A limiting structure is formed between the coil structure 14 and the distal end of the pushing tube 1, which can prevent the premature extraction of the release core wire 2 due to operation errors to a certain extent. At the same time, it also solves the problem of misrelease phenomenon that may occur when the distal end of the release core wire 2 bends with the pushing tube 1 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 in 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 is convenient for 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 section of the release core wire 2 will retract greatly in the tortuous blood vessel wall and separate from the release head 3, causing the release head 3 to disengage from the positioning groove 6. In order to smoothly operate the release core wire 2 to release the spring coil 5, a limiting cylinder (not shown) for straightening the release core wire 2 is provided in the hollow chamber of the pushing tube 1 in this embodiment. The limiting cylinder can be formed by a partial inward depression of the pushing tube 1, or can be fixed in the pushing tube 1 by welding or bonding. The release core wire 2 passes through the limiting cylinder and then extends out of the distal end of the pushing tube 1.

[0029] The other structures of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0030] It will be understood that although the present invention has been disclosed above in preferred embodiments, the above embodiments are 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, many possible changes and modifications can be made to the technical solution of the present invention by using the technical content disclosed above, or it can be modified into equivalent embodiments with 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 fall 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, a release core wire, a release head, a connecting rod and a spring coil, wherein the push tube has a hollow chamber inside, and a 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 released 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, characterized in that: 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. The coil structure is wound around the outside of the connecting rod and forms a limiting structure with the distal end surface of the push tube.

2. The mechanical release coil system according to claim 1, characterized in that: The length of the positioning groove is greater than 1.5 times the diameter of the release head and less than 2.5 times the diameter of the release head.

3. The mechanical release coil system according to claim 2, characterized in that: The release head is located at the proximal end of the positioning groove and the connecting rod is arranged obliquely.

4. The mechanical release coil system according to claim 3, characterized in that: The release head is spherical.

5. The mechanical release coil system according to claim 3, characterized in that: The proximal end of the connecting rod extends into the pushing tube and is fixedly connected to the release head, and the distal end extends out of the pushing tube and is fixedly connected to the spring coil.

6. The mechanical release coil system according to claim 1, characterized in that: The hollow chamber is provided with a limiting cylinder for straightening the release core wire. The release core wire passes through the limiting cylinder and extends out of the distal end of the push tube, and then curls to form the coil structure.

7. The mechanical release coil system according to claim 6, characterized in that: The coil structure is formed into a turn.

8. The mechanical release coil system according to claim 6, characterized in that: The limiting cylinder is formed by a local inward depression of the pushing tube.

9. The mechanical release coil system according to claim 6, characterized in that: The limiting cylinder is fixed in the pushing tube by welding or bonding.

10. The mechanical release coil system according to claim 1, characterized in that: The proximal end of the pushing tube is provided with a core wire release handle, and the proximal end of the core wire release is connected to the core wire release handle.

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