CN115607219A - Release device for vascular embolism spring ring - Google Patents
Release device for vascular embolism spring ring Download PDFInfo
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- CN115607219A CN115607219A CN202211274326.4A CN202211274326A CN115607219A CN 115607219 A CN115607219 A CN 115607219A CN 202211274326 A CN202211274326 A CN 202211274326A CN 115607219 A CN115607219 A CN 115607219A
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- 230000002792 vascular Effects 0.000 title abstract description 12
- 208000005189 Embolism Diseases 0.000 title description 2
- 238000000034 method Methods 0.000 abstract description 21
- 230000010102 embolization Effects 0.000 abstract description 11
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 description 5
- 206010002329 Aneurysm Diseases 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 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
- 210000004204 blood vessel Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000003073 embolic effect Effects 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
- 238000003466 welding Methods 0.000 description 1
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- 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
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- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Medical Informatics (AREA)
- Vascular Medicine (AREA)
- Reproductive Health (AREA)
- Engineering & Computer Science (AREA)
- Veterinary Medicine (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Neurosurgery (AREA)
- Surgical Instruments (AREA)
Abstract
The invention provides a releasing device for a vascular embolization spring coil, which comprises a releasing ball, a pushing rod and a release wire assembly, wherein the releasing ball is connected with the spring coil; the release wire component is positioned in the inner cavity of the push rod, the proximal end of the release wire component is connected to the proximal end of the push rod, and the distal end of the release wire component limits the release ball at the far end of the opening of the inner cavity of the push rod. So setting, can effectively and steadily carry on spacingly with the ball of will freeing, and this structural arrangement is comparatively simple. When needs will release the ball and take off, the near-end of rupture push rod to the near-end direction removes the release silk subassembly, remove the in-process and can release the spacing of release silk subassembly to the ball of taking off, thereby accomplish the release of the ball of taking off, should release the operation comparatively simple, guaranteed that the transportation process of spring coil is comparatively stable, and avoided the push rod among the current release device easily to appear to warp or the steel ball locks, cause and play the hall problem effectively.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a releasing device for a vascular embolization spring ring.
Background
The use of the vascular embolization spring coil is that the vascular embolization spring coil is delivered into intracranial or peripheral aneurysm through a microcatheter, after being filled, the spring coil part at the front end is released, and the push rod part is withdrawn out of the body, so that the use of the apparatus is completed. In the existing release device for the vascular embolization spring ring, a push rod part adopts a reverse-buckled bowl-shaped ring, a stainless steel wire extends out of the push rod part, a spring ring part adopts a stainless steel rod with a steel ball, and locking and releasing are realized through the matching of the reverse-buckled bowl-shaped ring and the steel ball. However, the connection point of the structure is a movable connection point, and the push rod may deform or the steel ball may be locked when the connection point is moved; meanwhile, the design distance of the structure design is long, so that the phenomenon of kicking the hall in the last stage of the spring ring conveying process can be caused.
Therefore, 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 releasing device for a vascular embolization spring ring, which aims to solve the problem that a push rod is deformed or a steel ball is locked to cause gym kicking in the existing releasing device for the vascular embolization spring ring.
In order to achieve the above purpose, the invention provides the following technical scheme:
a vasoocclusive coil release device, comprising:
the release ball is connected with the spring ring;
the pushing rod is provided with an inner cavity, and the side wall of the far end of the pushing rod is provided with an opening communicated with the inner cavity;
a release wire assembly located within the lumen of the pusher rod, the proximal end of the release wire being connected to the proximal end of the pusher rod, the distal end of the release wire assembly retaining the breakaway ball at the distal end of the opening of the lumen of the pusher rod; and breaking off the near end of the push rod, moving the release wire assembly towards the near end, and releasing the limit of the release wire assembly on the release ball so as to release the release ball.
Optionally, the releasing wire assembly includes a releasing wire, the pushing 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 pushing rod, and the elastic abutting part elastically abuts against the releasing ball when the releasing ball is limited.
Optionally, the release wire assembly includes a release wire and a limiting member disposed at a distal end of the release wire, and the limiting member is located at a distal end of the opening and limits the release ball in the inner cavity of the push rod;
the inner diameter of the opening is gradually increased along the direction from the far end to the near end;
and the release wire is moved towards the near end, so that the limiting piece can be pulled to move towards the near end of the opening, the limiting piece is released to limit the release ball, and the release ball is released.
Optionally, the number of the openings is three, the three openings are distributed at intervals along the circumferential direction of the pushing rod, and the inner diameter of each opening is gradually increased along the direction from the far end to the near end and is communicated with the inner cavity;
the releasing wire comprises a main body wire and three branch wires, and the near ends of the three branch wires are connected to the far end of the main body wire;
the number of the limiting parts is three, the three limiting parts are respectively connected to the far ends of the three branch wires and correspondingly located at the far ends of the three openings, and the limiting parts surround to form a limiting space so as to limit the release ball in the limiting space;
the release wire can be moved towards the near end to pull the three limiting pieces to move towards the near end of the corresponding opening at the same time, so that the limiting space is enlarged, the limiting of the release ball is released, and the release ball is released.
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 releasing ball is 0.5-0.7 times of the diameter of the limiting ball.
Optionally, the opening is a tapered opening, the length of the opening is greater than 1.5 times the diameter of the corresponding stop ball, and the minimum inner diameter of the opening is less than the diameter of the corresponding stop ball.
Optionally, the limiting members are limiting balls, the three limiting balls include 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 releasing ball is smaller than the outer diameter of the pushing rod;
the diameter of the first limiting ball is the same as that of the releasing ball, and the diameter of the third limiting ball is 1.5-2 times that of the first limiting ball.
Optionally, the limiting members are limiting blocks, the three limiting blocks have the same size, an included angle between the surface of each limiting block facing the opening and the axis of the pushing rod is 8-12 degrees, the surface of each limiting block facing the releasing ball is parallel to the axis of the pushing rod, and an included angle between the connecting surface of each 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 located at 1/3 position of the corresponding connecting surface facing the release ball.
Optionally, the opening is a tapered opening, and the length of the opening is 1.1 to 1.5 times of the axial size of the limit block along the push rod.
Optionally, the distance from the open distal end to the push rod distal end is less than 0.2mm.
Has the beneficial effects that:
the release device of the vascular embolization spring ring 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 far end of the push rod is provided with an opening communicated with the inner cavity; the release wire component is located in the inner cavity of the push rod, the proximal end of the release wire component is connected to the proximal end of the push rod, and the distal end of the release wire component limits the release ball at the far end of the opening of the inner cavity of the push rod. The structure setting like this can be effectively and steadily carry out spacingly with the ball of will liberating, and this structure setting is comparatively simple. When the ball is required to be released, the near end of the push rod is broken off, the wire releasing component is moved towards the near end, the limiting of the wire releasing component on the ball is released in the moving process, and the ball is released. The releasing operation is simple, the conveying process of the spring ring is stable, and the problem that the room is kicked due to the fact that the pushing rod is deformed or the steel ball is locked, which is easy to appear in the existing releasing device, is effectively solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural view of a release ball of a first embodiment of a vasoocclusive coil release device in a restrained state;
FIG. 2 is a schematic cross-sectional view of FIG. 1 from another perspective;
FIG. 3 is a schematic cross-sectional view of FIG. 1;
FIG. 4 is a schematic view of FIG. 1 from another perspective;
FIG. 5 is a schematic structural view of a release ball of a second embodiment of the vasoocclusive coil release device of the present invention in a position limiting configuration;
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 further perspective view of the three spacing balls of FIG. 5;
FIG. 9 is a schematic view of the release ball of FIG. 5 from a further perspective;
FIG. 10 is a schematic view of a portion of the structure of the release ball of FIG. 5 from another view angle in a limiting position;
FIG. 11 is a schematic structural view of a release ball of a third embodiment of a vasoocclusive coil release apparatus of the present invention in a position limiting configuration;
FIG. 12 is a schematic view of the structure of FIG. 11 from another perspective;
FIG. 13 is a schematic view of the distribution structure of three limiting balls in FIG. 11 from another view angle;
FIG. 14 is a partial schematic structural view of the release ball of FIG. 11 from a further perspective in a position-limiting condition;
FIG. 15 is a schematic structural view of a release ball of a fourth embodiment of the vasoocclusive coil release apparatus of the present invention in a position limiting configuration;
FIG. 16 is a schematic view of the structure of FIG. 15 from another perspective;
FIG. 17 is a schematic view of a further perspective view of the three spacing balls of FIG. 15;
fig. 18 is a partial structural view of the release ball in fig. 15 from another view angle in a limiting state.
The reference numbers in the figures: 1-a push rod; 11-lumen; 12-an opening; 13-a resilient abutment; 2-releasing the silk; 21-a body wire; 22-branched filaments; 3-a limit ball; 31-a first stop ball; 32-a second limit ball; 33-a third stop ball; 4-releasing the balls; 5-a connecting rod; 6-a limiting block.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention provides a releasing device for a vascular embolization spring ring, which aims to avoid the problem that a push rod is deformed or a steel ball is locked to cause a gymnasium kicking easily existing in the conventional releasing device.
The invention relates to a releasing device of a vascular embolization spring ring, which comprises a releasing ball 4, a pushing rod 1 and a releasing wire assembly, wherein the releasing ball 4 is connected with the spring ring, the pushing rod 1 is of a hollow structure and is provided with an inner cavity 11, the side wall of the far end of the pushing 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 pushing rod 1 and is approximately in a long 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 is connected to the proximal end of the push rod 1, and the distal end of the release wire assembly retains the release ball 4 at the distal end of the opening 12 of the lumen 11 of the push rod 1. Such structural arrangement can effectively and stably limit the release ball 4, and the structural arrangement is simpler.
When needs will disengage ball 4 and come off, the near-end of rupture push rod 1 to the near-end direction removes the release silk subassembly, it can release the spacing of release silk subassembly to disengaging ball 4 to remove the in-process, thereby accomplish the disengagement of disengaging ball 4, should disengage the operation comparatively simple, the transportation process of having both guaranteed the spring coil is comparatively stable, simultaneously avoided push rod 1 deformation or steel ball lock that easily appears in the current disengagement device again effectively to die, cause the problem of playing the pavilion.
The release ball 4 is connected with the spring ring through the connecting rod 5, optionally, the distal end welding of connecting rod 5 is a ring-shaped, is connected with the inside anti-unscrewing wire of spring ring, plays effective fixed action.
As shown in fig. 1 to 4, in the first embodiment of the present invention, the releasing wire assembly includes the releasing wire 2, that is, in the embodiment, the releasing wire assembly is the releasing wire 2, the pushing rod 1 is provided with an elastic abutting member 13 at the opening 13, the elastic abutting member 13 is substantially in a long rod shape, one end of the elastic abutting member 13 is connected to the proximal end of the opening 12, the other end of the elastic abutting member extends along the length direction of the pushing rod 1, and the elastic abutting member 13 abuts against the releasing ball 4 when the releasing ball 4 is limited.
When needs will disengage ball 4 and release when taking off, the near-end of rupture push rod 1 to the near-end direction removes release silk 2, and the removal in-process can release silk 2 and spacing to disengaging ball 4, and elasticity butt piece 13 can be because of self elasticity will disengage ball 4 bullet to not spacing position (also the inner chamber middle part of push rod 1) this moment, can make things convenient for follow-up ball 4 and the spring coil of freeing to break away from push rod 1 fast and smoothly like this. It should be noted that, here, the elastic abutting piece 13 can play a role of automatically resetting the releasing ball 4, and at the same time, due to the existence of the elastic abutting piece 13, the stability of the releasing ball 4 in the limiting process can be ensured.
Alternatively, as shown in fig. 1 and 2, the distal end of the elastic abutment 13 is substantially in the form of a cap, which can increase the contact area with the release ball, so that the stability of the release ball 4 during the position limitation can be more effectively ensured, and at the same time, the release ball 4 can be more effectively and automatically reset more quickly after being released.
Optionally, the elastic abutting part 13 and the pushing rod 1 are of an integral structure, so that the connection firmness of the elastic abutting part and the pushing rod 1 can be ensured, and the stability of the releasing ball 4 in limiting can be effectively ensured.
In a specific embodiment of the present invention, the release wire assembly includes a release wire 2 and a limiting member disposed at a distal end of the release wire 2, a proximal end of the release wire 2 is connected to a proximal end of the push rod 1, the limiting member is located at a distal end of the opening 12, and the release ball 4 is limited in the inner cavity 11 of the push rod 1; such structural arrangement can effectively and stably limit the releasing ball 4, and the structural arrangement is simpler.
And, the internal diameter of opening 12 increases along the direction of distal end to near-end gradually, when needing to disengage release ball 4, the near-end of rupture push rod 1, and move release silk 2 to the near-end direction and can pull the locating part and move to the near-end of opening 12, the removal in-process because the near-end internal diameter of opening 12 is greater than the distal end internal diameter, can release the locating part to the spacing of release ball 4, thereby accomplish the release of release ball 4, this release operation is simple, both guaranteed that the transportation process of spring coil is comparatively stable, simultaneously avoided push rod 1 deformation or steel ball lock that easily appears in the current release device effectively again to die, cause and play the pavilion problem.
It should be noted that the shape of the limiting element may be a sphere, a block or other reasonable shapes, and is not limited herein and is within the protection 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 correspondingly, the opening 12 is correspondingly provided in plural. A plurality of locating parts can enclose jointly and close and form and be used for carrying out spacing space to the ball 4 that disengages to guarantee the spacing stability and the reliability of ball 4 that disengages.
Of course, in consideration of the manufacturing cost, it is preferable that the number of the limiting members is three, and the interval arrangement of the three limiting members can effectively ensure the stability and reliability of the limiting of the disengaging ball 4 and can reduce the manufacturing cost to some extent.
In the specific embodiment of the present invention, three openings 12 are provided, 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 gradually increases 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; three limiting members are arranged, the three limiting members are respectively connected to the distal ends of the three branch wires 22 and are correspondingly positioned at the distal ends of the three openings 12 (that is, the three limiting members are arranged at an angle of 120 degrees with each other), and the plurality of limiting members surround to form a limiting space so as to limit the releasing ball 4 in the limiting space; when the release ball 4 needs to be released, the release wire 2 (i.e., the main body wire 21) moving towards the proximal end can pull the three limiting members to simultaneously move towards the proximal ends of the corresponding openings 12, so that the limiting space becomes larger, the limiting of the release ball 4 is released, and the release of the release ball 4 is completed.
As shown in fig. 1 to 10, in an embodiment of the present invention, the limiting members are three limiting balls 3, the three limiting balls 3 are arranged at an angle of 120 degrees, the limiting balls 3 are respectively welded and fixed at the distal ends of the three branch wires 22 and located at the distal end of the opening 12, the three limiting balls 3 together enclose 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 is accommodated in the distal end of the opening 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 body wire 21) is moved towards the proximal end, so that the three limiting balls 3 can be pulled to move from the distal end of the opening 12 to the proximal end of the opening 12, and the limiting space is gradually increased in the release process, so that the limiting space can be released to limit the release ball 4, and the release ball 4 is released.
As shown in fig. 1 to 14, in the second embodiment of the present invention, the diameters of the three limiting balls 3 are the same, and when the three limiting balls 3 are located at the distal ends of the corresponding openings 12, the minimum clearance between two adjacent limiting balls 3 is smaller than the diameter of the release ball 4 and larger than the diameter of the connecting rod 5. Structural design like this can guarantee that the ball 4 of liberation is spacing comparatively steadily in the spacing space that three spacing ball 3 enclose closed, is difficult for taking place to drop, can guarantee simultaneously again that the ball 4 of liberation carries out 360 degrees free rotation activities along with connecting rod 5, is favorable to crossing of spring coil curved and improvement compliance performance.
In the embodiment of the invention, the release device of the blood vessel embolism spring ring adopts a structural design that four balls are completely symmetrical, and the conveying spring ring and the release spring ring are both ensured to be in the right center position, namely, the spring ring and the push rod 1 can be kept to be arranged in the same axis. When the spring ring is conveyed, the spring ring is generally accommodated in the microcatheter and conveyed by the microcatheter, so that the central symmetrical structure of the spring ring and the microcatheter is beneficial to keeping a stable relative position with the microcatheter. If the spring ring and the push rod 1 are arranged in a non-concentric manner, the area where the spring ring is connected with the push rod 1 becomes an ellipse in the conveying process, the diameter of the major diameter may exceed the inner diameter of the micro-catheter, and thus the micro-catheter is excessively extruded, and the inner part of the micro-catheter is scratched and the inner layer falls off. Meanwhile, the embolic coil needs to be stable when being filled in the aneurysm, and if the coil is not coaxial with the pushing rod 1 (i.e. an eccentric structure), some extreme conditions may occur, such as unpredictable collision between the step part and the stent or other coils, causing unexpected stress, even displacement of the coil, which is very easy to cause rupture of the aneurysm and massive hemorrhage in filling of ruptured aneurysm.
Further, the distance from the far end of the opening 12 to the far end of the push rod 1 is less 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 push rod 1, namely has a movement angle of +/-60 degrees, so that the spring ring is beneficial to the adaptability of the spring ring and keeps stability.
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 an interval value between any two end point values) of the inner diameter of the pushing rod 1, and the sum of 2 times of the diameter of the limiting ball 3 and the diameter of the releasing ball 4 is smaller than the outer diameter of the pushing rod 1.
In the embodiment of the present invention, the diameter of the releasing ball 4 is 0.5-0.7 times (for example, 0.5 times, 0.55 times, 0.6 times, 0.65 times, 0.7 times, and any interval value between two end point values) the diameter of the limiting ball 3, and such a design can facilitate the limiting and releasing operations of the releasing ball 4.
Further, in the present 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 limiting ball 3, and the minimum inner diameter of the opening 12 is smaller than the diameter of the corresponding limiting ball 3. Due to the design, the limiting ball 3 can be guaranteed 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 three limiting balls 3 have different diameters, specifically, the three limiting balls 3 include a first limiting ball 31, a second limiting ball 32 and a third limiting ball 33, the diameters of the first limiting ball 31 and the second limiting ball 32 are the same, and are smaller than the diameter of the third limiting ball 33, that is, the two smaller limiting balls 3 among the three limiting balls 3 have the same diameter.
It should be noted that when three limiting balls 3 are located at the far end of the corresponding opening 12, the minimum clearance between two adjacent limiting balls 3 is smaller than the diameter of the releasing ball 4 and larger than the diameter of the connecting rod 5. Structural design like this can guarantee that the ball 4 of freeing is comparatively stable spacing in the spacing space that three spacing ball 3 enclose closed, is difficult for taking place to drop, can guarantee simultaneously again that the ball 4 of freeing carries out 360 degrees of free rotation activity along with connecting rod 5, is favorable to crossing of spring coil curved and improves compliance performance.
Optionally, the diameter of the third limiting ball 33 (the larger limiting ball 3) is 0.6-0.7 times (e.g., 0.6 times, 0.65 times, 0.7 times, and any interval value between two end values) the inner diameter of the push rod 1, and the sum of the diameter of the first limiting ball 31, the diameter of the third limiting ball 33, and the diameter of the disengagement ball 4 is smaller than the outer diameter of the push rod 1. The design like this, the diameter after the release of release ball 4 is released can not exceed the internal diameter of little pipe, can guarantee like this that the process of withdrawing is more smooth and easy.
Optionally, the diameter of the first limiting ball 31 is the same as the diameter of the disengaging ball 4, and the diameter of the third limiting ball 33 is 1.5-2 times (e.g., 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, and any interval between two endpoints) the diameter of the first limiting ball 31. The design can facilitate the limiting of the releasing ball 4 and the releasing operation.
Further, the distance from the far end of the opening 12 to the far end of the push rod 1 is less 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 push rod 1, namely has a movement angle of +/-60 degrees, so that the spring ring is beneficial to the adaptability of the spring ring and keeps stability.
Further, in the present 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 stopper ball 3, and the minimum inner diameter of the opening 12 is smaller than the diameter of the corresponding stopper ball 3. Due to the design, the limiting ball 3 can be guaranteed 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.
It should be noted that, in the second embodiment and the third embodiment of the present invention, the limiting member is the limiting ball 3, and the spherical surface is relatively round and not easy to cause tissue damage.
As shown in fig. 15 to 18, in the fourth embodiment of the present invention, the limiting members are three limiting members 6, and the three limiting members 6 have the same size and are arranged at an angle of 120 degrees.
It should be noted that when the three stoppers 6 are located at the distal ends of the corresponding openings 12, the minimum gap between two adjacent stoppers 6 is smaller than the diameter of the release ball 4 and larger than the diameter of the connecting rod 5. Structural design like this can guarantee to release ball 4 comparatively stably spacing in the spacing space that three stopper 6 encloses to close, is difficult for taking place to drop, can guarantee simultaneously again that release ball 4 carries out 360 degrees free rotation activities along with connecting rod 5, is favorable to crossing of spring coil curved and improvement compliance performance.
Optionally, the included 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 an interval value between any two endpoint values), and with such a design, the limiting block 6 faces the surface of the opening 12 to play a guiding role, so as to ensure that the limiting block 6 moves more smoothly in the opening 12.
Optionally, the surface of the limiting block 6 facing the releasing ball 4 is parallel to the axis of the pushing rod 1, and the surface is used for limiting the releasing ball 4, so that the stability and reliability of limiting the releasing ball 4 can be ensured, and meanwhile, the releasing ball 4 can be conveniently and rapidly slid out of the surface to complete the releasing operation.
Optionally, the included angle between the connection surface of the limiting block 6 and the branch wire 22 and the axis of the push rod 1 is 55-65 ° (for example, 55 °, 58 °, 60 °, 62 °, 65 °, and any endpoint value between the two endpoint values), and such design can ensure 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 sidewall of the opening 12, and collision is not likely to occur. Furthermore, the attachment points of the branch wires 22 are located at 1/3 of the positions of the corresponding attachment surfaces facing the release ball 4 (see fig. 11), which can more effectively prevent the branch wires 22 from colliding with the side walls 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 pushing rod 1, and with such a design, the limiting block 6 does not protrude out of the outer wall of the opening 12 during the movement process in the opening 12, thereby effectively preventing the limiting block 6 from damaging tissues.
It should be noted that, the side surface of the limiting block 6 facing the surface of the opening 12 and the connecting surface of the branch wire 22 plays a role in abutting and limiting, that is, as shown in fig. 11, when the limiting block 6 moves to the proximal end of the opening 12, the side surface abuts against the side wall of the opening 12, the moving process of the limiting block 6 is finished, and the limiting block 6 is limited in the moving process.
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 an interval value between any two end point values) of the size of the limiting block 6 along the axial direction of the push rod 1, such design can ensure that the limiting block 6 moves 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.
Furthermore, the distance from the far end of the opening 12 to the far end of the push rod 1 is less than 0.2mm, and the design can ensure that the connecting rod 5 can swing up and down for 30 degrees relative to the axis of the push rod 1, namely, the connecting rod has a movement angle of +/-60 degrees, so that the spring ring is beneficial to the adaptability of the spring ring and the stability is kept.
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 correspondingly, 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 pushing rod 1, 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 pushing rod 1, the main body wire 21 can be moved to pull the limiting member to move towards the proximal end of the opening 12, and in the moving process, because the inner diameter of the proximal end of the opening 12 is larger than that of the distal end, the limiting of the release ball 4 by the limiting ball 3 is released, so that the release of the release ball 4 is completed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A vasoocclusive coil release device, comprising:
the release ball is connected with the spring ring;
the pushing rod is provided with an inner cavity, and the side wall of the far end of the pushing rod is provided with an opening communicated with the inner cavity;
a release wire assembly located within the lumen of the pusher rod, the proximal end of the release wire assembly connected to the proximal end of the pusher rod, the distal end of the release wire assembly retaining the breakaway ball at the distal end of the opening of the lumen of the pusher rod;
and breaking off the near end of the push rod, moving the release wire assembly towards the near end, and releasing the limit of the release wire assembly on the release ball so as to release the release ball.
2. The vasoocclusive coil release device of claim 1, wherein the release wire assembly includes a release wire, the push rod is provided with a resilient abutment at the opening, one end of the resilient abutment is connected to the proximal end of the opening, the other end extends along the length of the push rod, and the resilient abutment resiliently abuts the release ball when the release ball is in a position limiting position.
3. The vasoocclusive coil release device of claim 1, wherein the release wire assembly includes a release wire and a retainer disposed at a distal end of the release wire, the retainer being distal to the opening and retaining the release ball within the lumen of the pusher rod;
the inner diameter of the opening is gradually increased along the direction from the far end to the near end;
and the release wire is moved towards the near end, so that the limiting piece can be pulled to move towards the near end of the opening, the limiting piece is released to limit the release ball, and the release ball is released.
4. The vasoocclusive coil release device of claim 3, wherein said openings are provided in three numbers, said three numbers being spaced circumferentially about said push rod, each of said openings having an inner diameter that increases in a distal-to-proximal direction and communicating with said lumen;
the releasing wire comprises a main body wire and three branch wires, and the near ends of the three branch wires are connected to the far end of the main body wire;
the limiting pieces are respectively connected to the far ends of the three branch wires and correspondingly located at the far ends of the three openings, and the limiting pieces surround to form a limiting space so as to limit the releasing ball in the limiting space;
the release wire can be moved towards the near end to pull the three limiting pieces to move towards the near end of the corresponding opening at the same time, so that the limiting space is enlarged, the limiting of the release ball is released, and the release ball is released.
5. The vasoocclusive coil release device of claim 4, wherein said stop member is a stop ball, three of said stop balls have the same diameter, said stop ball has a diameter that is 0.6-0.7 times the inner diameter of said pusher rod, and the sum of 2 times the diameter of said stop ball and the diameter of said release ball is less than the outer diameter of said pusher rod;
the diameter of the releasing ball is 0.5-0.7 times of the diameter of the limiting ball.
6. The vasoocclusive coil release apparatus of claim 5, wherein said opening is a tapered opening, said opening having a length greater than 1.5 times a diameter of the respective stop ball, said opening having a minimum inner diameter less than the diameter of the respective stop ball.
7. The vasoembolic coil release device of claim 4, wherein the stop member is a stop ball, and wherein three stop balls comprise a first stop ball, a second stop ball, and a third stop ball, the first and second stop balls having the same diameter and being smaller than the diameter of the third stop 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 releasing ball is smaller than the outer diameter of the pushing rod;
the diameter of the first limiting ball is the same as that of the releasing ball, and the diameter of the third limiting ball is 1.5-2 times that of the first limiting ball.
8. The device for releasing a vasoocclusive coil of claim 4, wherein the limiting members are limiting blocks, the three limiting blocks have the same size, the included angle between the surface of the limiting blocks facing the opening and the axis of the pushing rod is 8-12 degrees, the surface of the limiting blocks facing the release ball is parallel to the axis of the pushing rod, and the included angle between the connecting surface of the limiting blocks 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 located at 1/3 position of the corresponding connecting surface facing the release ball.
9. The vasoocclusive coil release device of claim 8, wherein the opening is a tapered opening having a length that is 1.1-1.5 times the axial dimension of the stop along the push rod.
10. The vasoocclusive coil release device of any of claims 3-9, wherein the distance from the open distal end to the push rod distal end is less than 0.2mm.
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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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| Application Number | Priority Date | Filing Date | Title |
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| CN202211274326.4A CN115607219B (en) | 2022-10-18 | 2022-10-18 | Release device of vascular embolism spring ring |
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| CN115607219B CN115607219B (en) | 2023-11-24 |
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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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| 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 |
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|---|---|
| CN115607219B (en) | 2023-11-24 |
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