CN115607219B - Release device of vascular embolism spring ring - Google Patents
Release device of vascular embolism spring ring Download PDFInfo
- Publication number
- CN115607219B CN115607219B CN202211274326.4A CN202211274326A CN115607219B CN 115607219 B CN115607219 B CN 115607219B CN 202211274326 A CN202211274326 A CN 202211274326A CN 115607219 B CN115607219 B CN 115607219B
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- Prior art keywords
- release
- ball
- push rod
- opening
- limiting
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- 230000002792 vascular Effects 0.000 title claims abstract description 23
- 208000005189 Embolism Diseases 0.000 title description 3
- 230000003073 embolic effect Effects 0.000 claims abstract description 21
- 230000000452 restraining effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 22
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 206010002329 Aneurysm Diseases 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 208000032843 Hemorrhage Diseases 0.000 description 1
- 208000004717 Ruptured Aneurysm Diseases 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007917 intracranial administration Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000000451 tissue damage Effects 0.000 description 1
- 231100000827 tissue damage Toxicity 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
- A61B17/12099—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder
- A61B17/12109—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder in a blood vessel
- A61B17/12113—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder in a blood vessel within an aneurysm
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
- A61B17/12131—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device
- A61B17/1214—Coils or wires
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
- A61B2017/1205—Introduction devices
- A61B2017/12054—Details concerning the detachment of the occluding device from the introduction device
Abstract
The invention provides a release device of a vascular embolic spring ring, which comprises a release ball, a push rod and a release wire assembly, wherein the release ball is connected with the spring ring, and an opening communicated with the inner cavity of the push rod is arranged on the side wall of the distal end of the push rod; the release wire assembly is positioned in the inner cavity of the push rod, the proximal end of the release wire assembly is connected to the proximal end of the push rod, and the distal end of the release wire assembly limits the release ball at the open distal end of the inner cavity of the push rod. The setting can effectively and stably limit the release ball, and the structure setting is simpler. When the release ball needs to be released, the proximal end of the push rod is broken, the release wire assembly is moved towards the proximal direction, and the release wire assembly is released to limit the release ball in the moving process, so that the release of the release ball is completed, the release operation is simpler, the conveying process of the spring coil is ensured to be stable, and the problems of deformation of the push rod or locking of the steel ball and kicking of a museum which are easily caused in the existing release device are effectively avoided.
Description
Technical Field
The invention belongs to the technical field of medical appliances, and particularly relates to a release device of a vascular embolic coil.
Background
The vascular embolic coil is delivered into the intracranial or peripheral aneurysm through a microcatheter, and after being stuffed, the front-end coil part is released, and the push rod part is withdrawn from the body, thereby completing the use of the device. In the existing vascular embolism spring coil releasing device, the push rod part adopts an inverted bowl-shaped ring, a stainless steel wire extends out of the push rod part, the spring coil part adopts a stainless steel rod with a steel ball, and locking and releasing are realized through the matching of the inverted bowl-shaped ring and the steel ball. However, the connection point of the structure is a movable connection point, and the pushing rod may be deformed or the steel ball may be locked in time during the movement process; meanwhile, the design distance of the structural design is long, so that the phenomenon of kicking the museum can occur in the last stage of the spring ring conveying process.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a release device of a vascular embolic coil, which aims to solve the problems of pushing rod deformation or steel ball locking and kicking caused by the existing release device of the vascular embolic coil.
In order to achieve the above object, the present invention provides the following technical solutions:
a vascular embolic coil detachment device comprising:
a release ball connected with the spring ring;
the pushing rod is provided with an inner cavity, and an opening communicated with the inner cavity is formed in the side wall of the distal end of the pushing rod;
a release wire assembly located in the lumen of the push rod, the proximal end of the release wire being connected to the proximal end of the push rod, the distal end of the release wire assembly limiting the release ball at the open distal end of the lumen of the push rod; the proximal end of the pushing rod is broken off, the release wire assembly is moved towards the proximal end, and the limit of the release wire assembly on the release ball can be released, so that the release ball can be released.
Optionally, the release wire assembly includes the release wire, the push rod in opening part is provided with elasticity butt spare, the one end of elasticity butt spare with open-ended proximal end is connected, and the other end is followed the length direction of push rod extends, elasticity butt spare in during release ball spacing elasticity butt in the release ball.
Optionally, the release wire assembly includes a release wire and a limiting member disposed at a distal end of the release wire, the limiting member being located at a distal end of the opening and limiting the release ball within the inner cavity of the push rod;
the inner diameter of the opening gradually increases along the direction from the distal end to the proximal end;
and the release wire can be pulled to move towards the proximal end of the opening by moving towards the proximal end, and the limit of the release ball by the limit piece is released so as to release the release ball.
Optionally, three openings are arranged, the three openings are distributed at intervals along the circumferential direction of the pushing rod, and the inner diameter of each opening gradually increases along the direction from the distal end to the proximal end and is communicated with the inner cavity;
the release wire comprises a main body wire and three branch wires, and the proximal ends of the three branch wires are connected to the distal ends of the main body wire;
the three limiting pieces are respectively connected to the distal ends of the three branch wires and are correspondingly positioned at the distal ends of the three openings, and the limiting pieces are enclosed to form a limiting space so as to limit the release ball in the limiting space;
and when the release wire is moved to the proximal end, the three limiting pieces can be pulled to move to the proximal end of the corresponding opening simultaneously, so that the limiting space is enlarged, and the limiting of the release ball is released to release the release ball.
Optionally, the limiting member is a limiting ball, the diameters of the three limiting balls are the same, the diameter of the limiting ball is 0.6-0.7 times of the inner diameter of the pushing rod, and the sum of 2 times of the diameter of the limiting ball and the diameter of the releasing ball is smaller than the outer diameter of the pushing rod;
the diameter of the release ball is 0.5-0.7 times of the diameter of the limit ball.
Optionally, the opening is a conical opening, the length of the opening is greater than 1.5 times of the diameter of the corresponding limit ball, and the minimum inner diameter of the opening is smaller than the diameter of the corresponding limit ball.
Optionally, the limiting piece is a limiting ball, the three limiting balls comprise a first limiting ball, a second limiting ball and a third limiting ball, and the diameters of the first limiting ball and the second limiting ball are the same and smaller than the diameter of the third limiting ball;
the diameter of the third limiting ball is 0.6-0.7 times of the inner diameter of the pushing rod, and the sum of the diameter of the first limiting ball, the diameter of the third limiting ball and the diameter of the release ball is smaller than the outer diameter of the pushing rod;
the diameter of the first limiting ball is the same as the diameter of the release ball, and the diameter of the third limiting ball is 1.5-2 times of the diameter of the first limiting ball.
Optionally, the limiting pieces are limiting blocks, the three limiting blocks are the same in size, the included angle between the surface of the limiting block facing the opening and the axis of the pushing rod is 8-12 degrees, the surface of the limiting block facing the release ball is parallel to the axis of the pushing rod, and the included angle between the connecting surface of the limiting block and the branch wire and the axis of the pushing rod is 55-65 degrees;
the maximum distance between the surface of the limiting block facing the opening and the connecting point of the branch wire is smaller than the wall thickness of the pushing rod, and the connecting point of the branch wire is positioned at 1/3 of the position of the corresponding connecting surface facing the release ball.
Optionally, the opening is a conical opening, and the length of the opening is 1.1-1.5 times of the axial dimension of the limiting block along the pushing rod.
Optionally, the distance from the open distal end to the distal end of the push rod is less than 0.2mm.
The beneficial effects are that:
the invention relates to a release device of a vascular embolic spring ring, which comprises a release ball, a push rod and a release wire assembly, wherein the release ball is connected with the spring ring, the push rod is provided with an inner cavity, and the side wall of the distal end of the push rod is provided with an opening communicated with the inner cavity; the release wire assembly is positioned in the inner cavity of the push rod, the proximal end of the release wire assembly is connected to the proximal end of the push rod, and the distal end of the release wire assembly limits the release ball at the open distal end of the inner cavity of the push rod. The structure setting can effectively and stably limit the release ball, and the structure setting is simpler. When the release ball is required to be released, the proximal end of the pushing rod is broken, the release wire assembly is moved in the proximal direction, and the limit of the release wire assembly to the release ball is released in the moving process, so that the release of the release ball is completed. The releasing operation is simpler, the conveying process of the spring ring is ensured to be stable, and the problem that the pushing rod is deformed or the steel ball is locked to cause a kicking pavilion in the existing releasing device is effectively avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. Wherein:
FIG. 1 is a schematic view of a first embodiment of a vascular embolic coil detachment device of the present invention in a limited position;
FIG. 2 is a schematic cross-sectional view of the structure of FIG. 1 from another perspective;
FIG. 3 is a schematic cross-sectional view of FIG. 1;
FIG. 4 is a schematic view of the structure of FIG. 1 from another view;
FIG. 5 is a schematic view of a second embodiment of a vascular embolic coil detachment device of the present invention in a constrained position;
FIG. 6 is a schematic cross-sectional view of FIG. 5;
FIG. 7 is a schematic view of the structure of FIG. 5 from another perspective;
FIG. 8 is a schematic view of a distribution structure of three of the check balls shown in FIG. 5 at another view angle;
FIG. 9 is a schematic view of the release ball of FIG. 5 from another perspective;
FIG. 10 is a schematic view of a partial structure of the release ball of FIG. 5 in a still further view from a limited position;
FIG. 11 is a schematic view of a third embodiment of a vascular embolic coil detachment device of the present invention in a constrained position;
FIG. 12 is a schematic view of the structure of FIG. 11 from another perspective;
FIG. 13 is a schematic view of a distribution structure of three of the check balls of FIG. 11 at another view angle;
FIG. 14 is a schematic view of a partial structure of the release ball of FIG. 11 in a still further view from a limited position;
FIG. 15 is a schematic view showing a structure of a release ball in a limited state according to a fourth embodiment of a vascular embolic coil release device of the present invention;
FIG. 16 is a schematic view of the structure of FIG. 15 from another perspective;
FIG. 17 is a schematic view of a distribution structure of the three check balls of FIG. 15 at another view angle;
fig. 18 is a schematic partial structure of the release ball of fig. 15 in a still further view in a limited state.
Reference numerals in the drawings: 1-pushing a rod; 11-lumen; 12-opening; 13-resilient abutments; 2-releasing the wire; 21-a body wire; 22-branch wires; 3-limiting balls; 31-a first limit ball; 32-a second limit ball; 33-a third limit ball; 4-release ball; 5-connecting rods; and 6-limiting blocks.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
The present invention will be described in detail with reference to examples. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention provides a release device of a vascular embolic spring ring, which aims to avoid the problem of kicking a house caused by deformation of a pushing rod or locking of a steel ball which easily occurs in the existing release device.
The invention relates to a release device of a vascular embolic spring ring, which comprises a release ball 4, a push rod 1 and a release wire assembly, wherein the release ball 4 is connected with the spring ring, the push rod 1 is of a hollow structure and is provided with an inner cavity 11, the side wall of the distal end of the push rod 1 is provided with an opening 12 communicated with the inner cavity 11, and the opening 12 extends along the length direction of the push rod 1 and is approximately in a strip shape; the release wire assembly is located in the lumen 11 of the push rod 1, the proximal end of the release wire assembly being connected to the proximal end of the push rod 1, the distal end of the release wire assembly restraining the release ball 4 at the open distal end 12 of the lumen 11 of the push rod 1. Such a structural arrangement is capable of effectively and stably limiting the release ball 4, and is relatively simple.
When the release ball 4 needs to be released, the proximal end of the push rod 1 is broken, the release wire assembly is moved towards the proximal direction, and the release wire assembly is released to limit the release ball 4 in the moving process, so that the release of the release ball 4 is completed, the release operation is simpler, the conveying process of a spring ring is ensured to be stable, and the problems that the push rod 1 is deformed or a steel ball is locked and a kicking pavilion is caused in the existing release device are effectively avoided.
The release ball 4 is connected with the spring ring through the connecting rod 5, optionally, the far end of the connecting rod 5 is welded into a ring shape and is connected with the anti-unwinding wire inside the spring ring, so that the effective fixing function is achieved.
As shown in fig. 1 to 4, in a first embodiment of the present invention, the release wire assembly includes a release wire 2, that is, in this embodiment, the release wire assembly is the release wire 2, the push rod 1 is provided with an elastic abutment 13 at the opening 13, the elastic abutment 13 is substantially in a long rod shape, one end of the elastic abutment 13 is connected to the proximal end of the opening 12, the other end extends along the length direction of the push rod 1, and the elastic abutment 13 elastically abuts against the release ball 4 when the release ball 4 is limited.
When the release ball 4 needs to be released, the proximal end of the push rod 1 is broken, the release wire 2 is moved towards the proximal direction, the release wire 2 limits the release ball 4 in the moving process, and at the moment, the elastic abutting piece 13 can spring the release ball 4 to an unlimited position (namely the middle part of the inner cavity of the push rod 1) due to self elasticity, so that the follow-up release ball 4 and the spring ring can be conveniently and rapidly separated from the push rod 1. It should be noted that, here, the elastic abutment 13 may play a role in automatically resetting the release ball 4, and meanwhile, due to the existence of the elastic abutment 13, stability of the release ball 4 during limiting may be ensured.
Optionally, as shown in fig. 1 and 2, the distal end of the elastic abutment member 13 is generally in a cap-shaped structure, which can increase the contact area with the release ball, so as to more effectively ensure the stability of the release ball 4 when limiting, and also more effectively perform a faster automatic reset after releasing the release ball 4.
Optionally, the elastic abutting piece 13 and the pushing rod 1 are integrally structured, so that the connection firmness of the elastic abutting piece and the pushing rod 1 can be ensured, and the stability of the elastic abutting piece and the pushing rod during limiting of the release ball 4 can be effectively ensured.
In the specific embodiment of the invention, the release wire assembly comprises a release wire 2 and a limiting piece arranged at the distal end of the release wire 2, wherein the proximal end of the release wire 2 is connected with the proximal end of the push rod 1, and the limiting piece is positioned at the distal end of the opening 12 and limits the release ball 4 in the inner cavity 11 of the push rod 1; such a structural arrangement is capable of effectively and stably limiting the release ball 4, and is relatively simple.
And, the internal diameter of opening 12 increases gradually along distal end to the direction of proximal end, when needs are with releasing ball 4, break push rod 1's proximal end to the proximal end direction removes release wire 2 and can stimulate the locating part to the proximal end removal of opening 12, and the removal in-process is because the proximal end internal diameter of opening 12 is greater than distal end internal diameter, then can release the locating part to the spacing of releasing ball 4, thereby accomplish the release of releasing ball 4, this release operation is simpler, and the transportation process of spring coil has both been guaranteed comparatively stably, and push rod 1 deformation or steel ball lock that easily appears in the current release device has been avoided simultaneously effectively, lead to the fact the play museum problem.
It should be noted that the shape of the limiting member may be spherical, block-shaped or other reasonable shapes, which are not limited herein, and are all within the scope of the present invention.
In the present invention, the number of the limiting members may be plural, such as 2, 3 or more, and the openings 12 are correspondingly provided. The limiting pieces can jointly enclose to form a limiting space for limiting the release ball 4, so that the stability and reliability of limiting the release ball 4 are ensured.
Of course, considering the manufacturing cost, preferably, the number of the limiting pieces is three, and the spacing arrangement of the three limiting pieces can effectively ensure the stability and reliability of the limiting of the release ball 4 and reduce the manufacturing cost to a certain extent.
In the embodiment of the invention, three openings 12 are arranged, the three openings 12 are distributed at intervals along the circumferential direction of the push rod 1, and the inner diameter of each opening 12 is gradually increased along the direction from the distal end to the proximal end and is communicated with the inner cavity 11; the release wire 2 comprises a main body wire 21 and three branch wires 22, wherein the proximal ends of the three branch wires 22 are connected with the distal end of the main body wire 21; the three limiting pieces are respectively connected to the distal ends of the three branch wires 22 and correspondingly positioned at the distal ends of the three openings 12 (namely, the three limiting pieces are arranged at 120 degrees with each other), and the plurality of limiting pieces enclose to form a limiting space so as to limit the release ball 4 in the limiting space; when the release ball 4 needs to be released, the release wire 2 (i.e. the main wire 21) can be pulled to move to the proximal end of the corresponding opening 12 at the same time, so that the limiting space is enlarged, and the limit of the release ball 4 is released, thereby completing the release of the release ball 4.
As shown in fig. 1 to 10, in one embodiment of the present invention, the limiting members are three limiting balls 3, the three limiting balls 3 are disposed at 120 degrees, the limiting balls 3 are respectively welded and fixed at distal ends of the three branch wires 22 and are located at distal ends of the openings 12, and the three limiting balls 3 jointly enclose to form a limiting space, wherein most of the limiting balls 3 are accommodated in the inner cavity 11 of the push rod 1, and at least a part of the limiting balls are accommodated in the distal ends of the openings 12. When the limiting ball 3 is positioned at the far end of the opening 12, the releasing ball 4 can be effectively and stably limited in the limiting space; when the release ball 4 needs to be released, the release wire 2 (i.e. the main wire 21) can be moved to the proximal end to pull the three limit balls 3 to move from the distal end of the opening 12 to the proximal end of the opening 12, and the limit space is gradually increased in the release process, so that the limit space can be released to limit the release ball 4, and the release ball 4 can be released to complete release.
As shown in fig. 1 to 14, in the second embodiment of the present invention, the diameters of the three limit balls 3 are the same, and when the three limit balls 3 are located at the distal ends of the corresponding openings 12, the minimum gap between two adjacent limit balls 3 is smaller than the diameter of the release ball 4 and larger than the diameter of the connecting rod 5. By means of the structural design, the release ball 4 can be guaranteed to be stably limited in the limiting space surrounded by the three limiting balls 3, falling is difficult to occur, and meanwhile the release ball 4 can be guaranteed to perform 360-degree free rotation along with the connecting rod 5, so that the spring ring is bent and the flexibility performance is improved.
In the embodiment of the invention, the release device of the vascular embolic coil adopts a completely symmetrical structural design of four balls, and the delivery coil and the release coil are both ensured to be at the right central position, namely, the coil and the push rod 1 can be kept at the same axle center. When the spring ring is conveyed, the spring ring is generally accommodated in the micro-catheter and conveyed by means of the micro-catheter, so that the central symmetry structure of the spring ring and the micro-catheter is beneficial to keeping a stable relative position with the micro-catheter. If the spring coil and the pushing rod 1 are not arranged coaxially, the connection area of the spring coil and the pushing rod 1 becomes elliptical in the conveying process, the diameter of the long diameter of the spring coil may exceed the inner diameter of the microcatheter, and the microcatheter is extruded in a transitional manner, so that the microcatheter is scratched and the inner layer of the microcatheter is fallen off. Meanwhile, the embolic coil needs to be stable when filling the aneurysm, if the coil is not coaxial with the push rod 1 (i.e. eccentric structure), extreme situations may occur, such as unpredictable collision between the step part and the stent or other coils, unexpected stress may occur, and even displacement of the coil may occur, which may easily cause massive hemorrhage caused by bursting the aneurysm during filling of the ruptured aneurysm.
Further, the distance from the far end of the opening 12 to the far end of the pushing rod 1 is smaller than 0.2mm, and the design can ensure that the connecting rod 5 swings up and down by 30 degrees relative to the axis of the pushing rod 1, namely, the connecting rod has a movable angle of +/-60 degrees, so that the adaptability of the spring ring is facilitated, and the stability is maintained.
Further, the diameter of the limiting ball 3 is 0.6-0.7 times (such as 0.6 times, 0.65 times, 0.7 times and interval value between any two end points) of the inner diameter of the push rod 1, and the sum of 2 times of the diameter of the limiting ball 3 and the diameter of the release ball 4 is smaller than the outer diameter of the push rod 1, so that the diameter of the release ball 4 after release does not exceed the inner diameter of the micro-tube, and the retracting process can be ensured to be smoother.
In the embodiment of the invention, the diameter of the release ball 4 is 0.5-0.7 times (such as 0.5 times, 0.55 times, 0.6 times, 0.65 times, 0.7 times and interval values between any two end values) of the diameter of the limit ball 3, so that the design can facilitate the limit and release operations of the release ball 4.
Further, in this embodiment, the opening 12 is a tapered opening 12, the length of the opening 12 is greater than 1.5 times the diameter of the corresponding limit ball 3, and the minimum inner diameter of the opening 12 is smaller than the diameter of the corresponding limit ball 3. By the design, the limit ball 3 can be ensured to move smoothly from the far end to the near end in the opening 12, and the releasing operation of the releasing ball 4 can be realized in the moving process.
As shown in fig. 11 to 14, in the third embodiment of the present invention, the diameters of the three limit balls 3 are different, specifically, the three limit balls 3 include a first limit ball 31, a second limit ball 32, and a third limit ball 33, the diameters of the first limit ball 31 and the second limit ball 32 are the same, and are smaller than the diameter of the third limit ball 33, that is, the diameters of two smaller limit balls 3 among the three limit balls 3 are the same.
It should be noted that, when the three limit balls 3 are located at the distal ends of the corresponding openings 12, the minimum gap between two adjacent limit balls 3 is smaller than the diameter of the release ball 4 and larger than the diameter of the connecting rod 5. By means of the structural design, the release ball 4 can be guaranteed to be stably limited in the limiting space surrounded by the three limiting balls 3, falling is difficult to occur, and meanwhile the release ball 4 can be guaranteed to perform 360-degree free rotation along with the connecting rod 5, so that the spring ring is bent and the flexibility performance is improved.
Optionally, the diameter of the third limit ball 33 (larger limit ball 3) is 0.6-0.7 times (such as 0.6 times, 0.65 times, 0.7 times and the interval value between any two end values) the inner diameter of the push rod 1, and the sum of the diameter of the first limit ball 31, the diameter of the third limit ball 33 and the diameter of the release ball 4 is smaller than the outer diameter of the push rod 1. By the design, the diameter of the release ball 4 after release does not exceed the inner diameter of the micro-catheter, so that the retracting process can be ensured to be smoother.
Optionally, the diameter of the first limit ball 31 is the same as the diameter of the release ball 4, and the diameter of the third limit ball 33 is 1.5-2 times (such as 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, and the interval value between any two end values) the diameter of the first limit ball 31. Such a design may facilitate the limiting and release operations of the release ball 4.
Further, the distance from the far end of the opening 12 to the far end of the pushing rod 1 is smaller than 0.2mm, and the design can ensure that the connecting rod 5 swings up and down by 30 degrees relative to the axis of the pushing rod 1, namely, the connecting rod has a movable angle of +/-60 degrees, so that the adaptability of the spring ring is facilitated, and the stability is maintained.
Further, in this embodiment, the opening 12 is a tapered opening 12, the length of the opening 12 is greater than 1.5 times the diameter of the corresponding limit ball 3, and the minimum inner diameter of the opening 12 is smaller than the diameter of the corresponding limit ball 3. By the design, the limit ball 3 can be ensured to move smoothly from the far end to the near end in the opening 12, and the releasing operation of the releasing ball 4 can be realized in the moving process.
In the second embodiment and the third embodiment of the present invention, the limiting member is a limiting ball 3, and the spherical surface is relatively round and is not easy to generate tissue damage.
As shown in fig. 15 to 18, in the fourth embodiment of the present invention, the limiting members are limiting blocks 6, and three limiting blocks 6 are provided, and the three limiting blocks 6 are the same in size and are disposed at 120 degrees.
It should be noted that, when the three limiting blocks 6 are located at the distal ends of the corresponding openings 12, the minimum gap between two adjacent limiting blocks 6 is smaller than the diameter of the release ball 4 and larger than the diameter of the connecting rod 5. By means of the structural design, the release ball 4 can be guaranteed to be stably limited in the limiting space surrounded by the three limiting blocks 6, falling is difficult to occur, and meanwhile the release ball 4 can be guaranteed to freely rotate by 360 degrees along with the connecting rod 5, so that the spring ring is bent and the flexibility is improved.
Optionally, the angle between the surface of the limiting block 6 facing the opening 12 and the axis of the pushing rod 1 is 8-12 ° (for example, 8 °, 9 °, 10 °, 11 °, 12 °, and the interval value between any two end values), so that the limiting block 6 is guided towards the surface of the opening 12, so as to ensure that the limiting block 6 moves relatively smoothly in the opening 12.
Optionally, the surface of stopper 6 towards trip ball 4 is parallel with the axis of push rod 1, and this surface is used for spacing trip ball 4, and such design can guarantee the spacing stability and the reliability of trip ball 4, also conveniently is followed this surface and is slipped out in order to accomplish its trip operation fast simultaneously to trip ball 4.
Optionally, the included angle between the connection surface of the limiting block 6 and the branch wire 22 and the axis of the pushing rod 1 is 55-65 ° (such as 55 °, 58 °, 60 °, 62 °, 65 ° -endpoint values between any two endpoint values), so that when the limiting block 6 moves to the proximal end in the opening 12, a gap exists between the branch wire 22 and the side wall of the opening 12, and collision is not easy to occur. Still further, the connection point of the branch wire 22 is located at 1/3 of the corresponding connection face toward the release ball 4 (see fig. 11), and such a design can more effectively prevent the branch wire 22 from hitting the side wall of the opening 12 when the stopper 6 moves to the proximal end in the opening 12.
Optionally, the maximum distance between the surface of the limiting block 6 facing the opening 12 and the connection point of the branch wire 22 is smaller than the wall thickness of the push rod 1, and the limiting block 6 does not bulge the outer wall of the opening 12 in the moving process of the opening 12, so that the damage of the limiting block 6 to tissues is effectively avoided.
It should be noted that, the side surface of the stopper 6 facing the surface of the opening 12 and the connection surface of the branch wire 22 plays a role of abutment and limitation, that is, as shown in fig. 11, when the stopper 6 moves to the proximal end of the opening 12, the side surface abuts against the side wall of the opening 12, the movement process of the stopper 6 is ended, and the role of limiting the movement process of the stopper 6 is played.
Further, the opening 12 is a tapered opening 12, the length of the opening 12 is 1.1-1.5 times (for example, 1.1 times, 1.2 times, 1.3 times, 1.4 times, 1.5 times and a section value between any two end values) the size of the stopper 6 along the axial direction of the push rod 1, so that the stopper 6 can be ensured to move smoothly from the distal end to the proximal end in the opening 12 by the design, and the releasing operation of the releasing ball 4 can be realized in the moving process.
Further, the distance from the far end of the opening 12 to the far end of the pushing rod 1 is smaller than 0.2mm, and the design can ensure that the connecting rod 5 swings up and down by 30 degrees relative to the axis of the pushing rod 1, namely, the connecting rod has a movable angle of +/-60 degrees, so that the adaptability of the spring ring is facilitated, and the stability is maintained.
In all the above embodiments, the diameter of the connecting rod 5 is 0.5 times the inner diameter of the push rod 1, and accordingly the diameter of the main body wire 21 in the release wire 2 is 0.5 times the inner diameter of the push rod 1.
In the second to fourth embodiments, the proximal end of the main body wire 21 is connected to the proximal end of the push rod 1, and when the release ball 4 needs to be released, the main body wire 21 can be moved in the proximal direction by breaking the proximal end of the push rod 1, the main body wire 21 can pull the limiting member to move toward the proximal end of the opening 12, and in the moving process, the limiting of the release ball 4 by the limiting ball 3 can be released due to the fact that the proximal end inner diameter of the opening 12 is larger than the distal end inner diameter, so that the release of the release ball 4 is completed.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A vascular embolic coil detachment device, comprising:
a release ball connected with the spring ring;
the pushing rod is provided with an inner cavity, and an opening communicated with the inner cavity is formed in the side wall of the distal end of the pushing rod;
a release wire assembly located in the lumen of the push rod, the proximal end of the release wire assembly being connected to the proximal end of the push rod, the distal end of the release wire assembly restraining the release ball at the open distal end of the lumen of the push rod;
breaking the proximal end of the pushing rod, and moving the release wire assembly proximally to release the limit of the release wire assembly on the release ball so as to release the release ball;
the release wire assembly comprises a release wire, the push rod is provided with an elastic abutting part at the opening, one end of the elastic abutting part is connected with the proximal end of the opening, the other end of the elastic abutting part extends along the length direction of the push rod, the elastic abutting part is elastically abutted to the release ball when the release ball is limited, the release wire is pulled out of the push tube when released, and the elastic abutting part pushes the release ball to be separated from the opening of the inner cavity.
2. The vascular embolic coil detachment device of claim 1, wherein the detachment ball is connected to the coil by a connecting rod.
3. The vascular embolic coil detachment device of claim 2, wherein the distal end of the connecting rod is welded in a ring shape for connection with an anti-unravel wire inside the coil.
4. The vascular embolic coil detachment device of claim 1, wherein the distal end of the resilient abutment is generally cap-like in configuration for increasing contact area with the detachment bulb.
5. The vascular embolic coil detachment device of any of claims 1-4, wherein the resilient abutment is of unitary construction with the pusher rod.
6. The vascular embolic coil detachment device of any of claims 1-4, wherein the opening extends along the length of the pusher rod, being generally elongate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211274326.4A CN115607219B (en) | 2022-10-18 | 2022-10-18 | Release device of vascular embolism spring ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211274326.4A CN115607219B (en) | 2022-10-18 | 2022-10-18 | Release device of vascular embolism spring ring |
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| CN115607219A CN115607219A (en) | 2023-01-17 |
| CN115607219B true CN115607219B (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211274326.4A Active CN115607219B (en) | 2022-10-18 | 2022-10-18 | Release device of vascular embolism spring ring |
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| CN113397642A (en) * | 2021-08-02 | 2021-09-17 | 珠海通桥医疗科技有限公司 | Vascular embolism spring coil system |
| CN113456154A (en) * | 2021-07-15 | 2021-10-01 | 上海心玮医疗科技股份有限公司 | Implant conveying guide wire |
| CN114469231A (en) * | 2022-01-27 | 2022-05-13 | 南京思脉德医疗科技有限公司 | Embolic coil conveying system |
| CN114948046A (en) * | 2022-04-11 | 2022-08-30 | 上海心玮医疗科技股份有限公司 | Delivery system for implant |
| CN115005920A (en) * | 2022-07-21 | 2022-09-06 | 苏州中天医疗器械科技有限公司 | Plug spring ring |
| CN115068039A (en) * | 2022-07-25 | 2022-09-20 | 苏州中天医疗器械科技有限公司 | Plug spring ring mechanism |
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|---|---|---|---|---|
| US5350397A (en) * | 1992-11-13 | 1994-09-27 | Target Therapeutics, Inc. | Axially detachable embolic coil assembly |
| US6296622B1 (en) * | 1998-12-21 | 2001-10-02 | Micrus Corporation | Endoluminal device delivery system using axially recovering shape memory material |
| CN109044469A (en) * | 2018-09-17 | 2018-12-21 | 南京思脉德医疗科技有限公司 | A kind of embolism spring ring conveying device |
| CN212261432U (en) * | 2020-02-21 | 2021-01-01 | 乐沐钛医疗科技(上海)有限公司 | Therapeutic device |
| CN113456154A (en) * | 2021-07-15 | 2021-10-01 | 上海心玮医疗科技股份有限公司 | Implant conveying guide wire |
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| CN115068039A (en) * | 2022-07-25 | 2022-09-20 | 苏州中天医疗器械科技有限公司 | Plug spring ring mechanism |
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|---|---|
| CN115607219A (en) | 2023-01-17 |
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