CN109350161B

CN109350161B - Electromagnetic releasing device for spring ring

Info

Publication number: CN109350161B
Application number: CN201811183982.7A
Authority: CN
Inventors: 尹凯; 张耀元; 曾琳; 赵亚忠
Original assignee: Nanhua University
Current assignee: Nanhua University
Priority date: 2018-10-11
Filing date: 2018-10-11
Publication date: 2020-10-16
Anticipated expiration: 2038-10-11
Also published as: CN109350161A

Abstract

The invention discloses an electromagnetic releasing device for a spring ring, which comprises a spring ring, a conduit, a magnetic positioning bolt and a push rod arranged in the conduit, wherein the end part of the spring ring is provided with a joint part, and the joint part is provided with a clamping groove; the end part of the push rod is provided with a containing hole for containing the joint part; the end part of the push rod is also sleeved with an annular magnet and a coil, the annular magnet is movably connected with the push rod, and the push rod is provided with a positioning hole which penetrates through the accommodating hole and the outer surface of the push rod; the positioning bolt can be accommodated in the positioning hole and the clamping groove at the same time; when the annular magnet is located at the locking position, the annular magnet limits the positioning bolt in the positioning hole and the clamping groove; when the ring magnet moves from the locking position to the unlocking position under the pushing of the coil, the positioning bolt can be withdrawn from the clamping groove. Before the spring ring is released, the spring ring can be stably and reliably jointed with the push rod; when the spring ring needs to be disengaged, the annular magnet is pushed to the unlocking position by utilizing magnetic force to realize instantaneous disengagement of the spring ring, and the accuracy of the placing position of the spring ring is improved.

Description

Electromagnetic releasing device for spring ring

Technical Field

The invention relates to the field of medical instruments, in particular to an electromagnetic releasing device for a spring ring.

Background

Since the 80 th of the 20 th century, aneurysms were clinically embolized by interventional techniques, and in the early days, embolized aneurysms by using a removable balloon as an embolus, but the balloon is difficult to adapt to irregular intratumoral shapes, easily breaks the aneurysm or cannot embolize the aneurysm comprehensively. The coil can fully fill and adapt to the shape of the aneurysm cavity, so that the coil is used for embolizing the aneurysm and becomes a main treatment means for the aneurysm.

In interventional procedures for spring coil embolization of aneurysms, coils of different sizes, three-dimensional or two-dimensional shapes need to be delivered from large to small into the tumor until the spring within the tumor can densely pack the entire aneurysm. Clinically, interventional procedures for every aneurysm typically require several to ten-odd coils to achieve dense packing of the aneurysm. On the basis of establishing the channel by using the catheter, the filling of each spring coil needs to pass through the steps of conveying, placing, releasing and withdrawing the push rod, the operation duration of the three steps of conveying, placing and releasing is determined according to the establishment condition of the channel, the clinical operation level of a doctor and the like, and the release time of the spring coil influences the whole operation time.

The releasing is that the spring ring for embolism needs to be disconnected at the joint (main joint) of the push rod and the spring ring. After the disconnection, the push wire is drawn out through the catheter. The physician may continue to push and release additional embolic coils through the microcatheter into the aneurysm as needed for embolic volume and density. Currently, there are three main modes of embolic coil release: hydrolytic, electrolytic and mechanical release. The hydrolytic release spring ring has poor controllability and less clinical application; the most used electrolytic release spring coils in clinic mostly have the problems of too long release time or unstable release time, and the operation time is influenced. Moreover, the electrolytic primary disconnection point is mainly formed by welding and needs to be chemically fused, so that the risk of blood vessel damage exists; the simple buckle type design in the mechanical releasing spring ring can realize the instant releasing of the spring ring, but the controllability of the spring ring in the filling process is reduced, and particularly, the spring ring is difficult to pull back or push after being pushed out of the channel. Patent document 1 (publication No. CN 107951525A) discloses a mechanical releasing device, which employs a core wire to lock a first protrusion of a spring ring and a second protrusion of a push rod in an axial direction, and uses the movable core wire inside the push rod to lock or unlock the connection between the push rod and the spring ring, so as to release the spring ring, but the core wire has high manufacturing cost and high assembly requirement, and after the spring ring is released, the second protrusion is likely to interfere with the first protrusion when the push rod is withdrawn, thereby changing the placement position of the released spring ring, affecting the accuracy of the placement position, and limiting the application of the mechanical releasing device.

Disclosure of Invention

The invention aims to solve the problems and provides an electromagnetic releasing device for a spring ring, which can stably convey the spring ring into a position in a human body where a blood vessel needs to be occluded, then easily release the spring ring, has a simple and convenient operation mode and cannot damage the blood vessel. The specific technical scheme is as follows.

The utility model provides a spring coil electromagnetism release device, its includes spring coil, pipe and sets up the push rod in the pipe, its characterized in that: the end part of the spring ring is provided with a joint part, and the joint part is provided with a clamping groove; an accommodating hole for accommodating the joint part is formed in the end part of the push rod, and the accommodating hole extends along the axial direction of the push rod; the end part of the push rod is further sleeved with an annular magnet and a coil, the annular magnet is closer to the spring ring than the coil, the coil is fixedly connected with the push rod, the annular magnet is movably connected with the push rod and can move along the axial direction of the push rod, a positioning hole penetrating through the accommodating hole and the outer surface of the push rod is formed in the position of the push rod corresponding to the clamping groove, and the positioning hole is closer to the spring ring than the coil; the spring ring electromagnetic release device also comprises a magnetic positioning bolt which can be accommodated in the positioning hole and the clamping groove at the same time; when the ring magnet is located at the locking position, the ring magnet at least partially covers the positioning hole, the ring magnet limits the positioning bolt in the positioning hole and the clamping groove, and the spring ring and the push rod are clamped together by the positioning bolt; when the ring magnet moves from the locking position to the unlocking position under the pushing of the coil, the positioning bolt can be withdrawn from the clamping groove, so that the engagement part of the spring ring can be freely withdrawn from the accommodating hole of the push rod.

Further, the push rod is further provided with a limiting claw, the limiting claw is used for keeping the annular magnet at a locking position, and the limiting claw can be used for releasing the limitation on the annular magnet when being positioned outside the catheter.

Furthermore, the limiting clamping jaw is an elastic clamping jaw, when the limiting clamping jaw is positioned in the guide pipe, the limiting clamping jaw is restrained by the guide pipe to keep the annular magnet at a locking position, and when the limiting clamping jaw is positioned outside the guide pipe, the limiting clamping jaw is opened under the action of self elastic force to release the limitation on the annular magnet.

Furthermore, the limiting clamping jaw is arranged at a position corresponding to the positioning bolt, and the positioning bolt abuts against the limiting clamping jaw after being withdrawn from the clamping groove. This can prevent the dead bolt from completely disengaging from the push rod and remaining in the body of the human body.

Furthermore, one side of the positioning bolt, which deviates from the coil, is provided with a step structure, and when the positioning bolt is withdrawn from the clamping groove, the end part of the annular magnet is clamped with the step structure. This can prevent better that the pilot pin from breaking away from the push rod completely and remaining in the human body.

Furthermore, one side of the clamping groove, which is close to the coil, is provided with a first inclined surface, and the positioning bolt is provided with a second inclined surface corresponding to the first inclined surface. The first inclined surface and the second inclined surface are arranged to facilitate the spring ring to be withdrawn from the accommodating hole of the push rod, and the positioning bolt can be withdrawn from the clamping groove under the action of the first inclined surface even when the positioning bolt is not completely withdrawn from the clamping groove.

Further, the end of the push rod is provided with an annular flange limiting the position of the annular magnet. Thus, the ring magnet does not fall off from the end of the push rod when receiving the thrust of the coil.

Further, the engaging portion is rod-shaped.

The embodiment of the invention has the beneficial effects that: before the spring ring is released, the spring ring can be stably and reliably jointed with the push rod, so that the controllability of the spring ring before the release is ensured; when needs are got rid of, only need to circular telegram to the coil, utilize magnetic force to push away annular magnet to the unblock position, the location is tied and is withdrawed from the draw-in groove and can be realized the instantaneous release of spring coil, and the push rod withdraws from the operating position this moment and also can not produce the interference to the spring coil, has improved the position accuracy of laying of spring coil.

Drawings

FIG. 1 is a schematic view of the spring coil electromagnetic disengaging apparatus of the present invention (before the spring coil is disengaged);

FIG. 2 is a schematic view of the spring coil electromagnetic disengaging apparatus of the present invention (after the spring coil is disengaged);

FIG. 3 is a schematic view of a spring coil and engagement portion;

FIG. 4 is a schematic view of a positioning peg.

In the figure: the spring ring 1, the joint part 11, the clamping groove 12, the first inclined surface 121, the guide pipe 2, the push rod 3, the accommodating hole 31, the positioning hole 32, the annular flange 33, the annular magnet 4, the coil 5, the positioning bolt 6, the stepped structure 61, the second inclined surface 62 and the limiting claw 7.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Referring to fig. 1-4, an electromagnetic releasing device for a spring ring comprises a spring ring 1, a conduit 2 and a push rod 3 arranged in the conduit 2, wherein the end of the spring ring 1 is provided with a rod-shaped joint part 11, and the joint part 11 is provided with a clamping groove 12; the end of the push rod 3 is provided with a containing hole 31 for containing the joint part 11, and the containing hole 31 extends along the axial direction of the push rod 3; the end part of the push rod 3 is further sleeved with an annular magnet 4 and a coil 5, the annular magnet 4 is closer to the spring coil 1 than the coil 5, a flange can be arranged between the annular magnet 4 and the coil 5 to prevent the annular magnet 4 from contacting with the coil 5, the coil 5 is fixedly connected with the push rod 3, the annular magnet 4 is movably connected with the push rod 3 and can move along the axial direction of the push rod 3, a positioning hole 32 penetrating through the accommodating hole 31 and the outer surface of the push rod 3 is formed in the position, corresponding to the clamping groove 12, of the push rod 3, and the positioning hole 32 is closer to the spring coil 1 than the coil 5; the spring ring electromagnetic release device also comprises a magnetic positioning bolt 6, and the positioning bolt 6 can be simultaneously accommodated in the positioning hole 32 and the clamping groove 12; when the ring magnet 4 is located at the locking position, which is the position shown in fig. 1, the ring magnet 4 at least partially covers the positioning hole 32, and the ring magnet 4 limits the positioning bolt 6 in the positioning hole 32 and the clamping groove 12, and at the same time, the spring ring 1 and the push rod 3 are clamped together by the positioning bolt 6; when the ring magnet 4 is moved from the locking position to the unlocking position by the coil 5, the detent pin 6 can be withdrawn from the detent groove 12, so that the engagement portion 11 of the spring ring 1 can be freely withdrawn from the receiving hole 31 of the plunger 3.

The working principle of the spring ring electromagnetic releasing device is as follows: when the ring magnet 4 is located at the locking position, the inner wall of the ring magnet limits the positioning bolt 6 in the positioning hole 32 and the clamping groove 12, at the moment, the spring coil 1 and the push rod 3 are clamped together by the positioning bolt 6, the spring coil 1 moves along with the movement of the push rod 3, and an operator sends the spring coil 1 to a specified position, such as the position of an aneurysm, by moving the catheter 2 and/or the push rod 3. When the spring ring 1 moves to the right position, the coil 5 is electrified, the coil 5 generates thrust to the annular magnet 4 and the positioning bolt 6, the annular magnet 4 moves to the unlocking position to release the limitation on the positioning bolt 6, after the annular magnet 4 moves away, the magnetic positioning bolt 6 withdraws from the clamping groove 12 under the thrust of the coil 5 and the attraction of the positioning bolt, at the moment, the joint part 11 of the spring ring can freely withdraw from the accommodating hole 31 of the push rod 3, the operating personnel pulls the push rod 3 to the direction far away from the spring ring 1, the releasing operation of the spring ring is realized, and the joint part 11 of the spring ring does not generate any interference with the push rod or the positioning bolt 6 when withdrawing from the accommodating hole 31, so the accuracy of the mounting position of the spring ring can be improved. The positioning pin 6 is attracted by the ring magnet 4 and fixed on the ring magnet 4 after being withdrawn from the card slot 12. Meanwhile, when the release of the spring ring is not required, the ring magnet is stably held in the lock position, and the coil 5 can be energized to generate a magnetic induction line opposite to that in the release, so that the coil 5 attracts the ring magnet 4 to hold the lock position.

The engagement portion 11 and the spring ring 1 may be integrally formed, or may be assembled together in a separate structure. The structure and shape of the positioning pin are not limited as long as the positioning pin 6 can be clamped in the clamping groove 12 and the positioning hole 32 to limit the relative movement between the joint part 11 and the push rod 3.

In the preferred embodiment of the present invention, the push rod 3 is further provided with a limit jaw 7, and the limit jaw 7 is used for keeping the ring-shaped magnet 4 in a locked position and releasing the limit of the ring-shaped magnet 4 when the limit jaw 7 is positioned outside the catheter 2. For example, the restricting pawl 7 is provided at a position between the ring magnet 4 and the coil 5, and the restricting pawl 7 can hold or release the ring magnet 4 by swinging outward or rotating in the circumferential direction of the push rod 3. It should be noted that the structure and the mounting position of the restricting pawl 7 may be set as needed as long as it can hold the ring magnet 4 in the lock position and release the restriction of the ring magnet 4 when needed. The limit jaw 7 can be operated by a structure such as a pull wire penetrating the push rod 3.

In the preferred embodiment of the present invention, the limiting claws 7 are elastic claws, the limiting claws 7 are used for keeping the annular magnet 4 at the locking position, and can release the limitation on the annular magnet 4 when the limiting claws 7 are positioned outside the conduit 2, when the limiting claws 7 are positioned in the conduit 2, the limiting claws 7 are restrained by the conduit 2 to keep the annular magnet 4 at the locking position, and when the limiting claws 7 are positioned outside the conduit 2 under the pushing of the push rod 3, the limiting claws 7 open outwards under the action of own elastic force to release the limitation on the annular magnet 4. Adopt the structure that the elasticity jack catch can simplify the jack catch, provide the portability of operation, when needs release the spring coil, push out the tip of push rod 3 from pipe 2, spacing jack catch 7 is automatic to be opened when exposing outside pipe 2 completely, and the circular magnet 4 can move to the unblock position to coil 5 circular telegram thrust of formation this moment.

In the preferred embodiment of the present invention, the limiting claws 7 are arranged at positions corresponding to the positioning bolts 6, and abut against the limiting claws 7 after the positioning bolts 6 are withdrawn from the slots 12. This prevents the dead bolt 6 from being completely detached from the push rod 3 and left in the body of the human body. The limiting claw 7 may include a plurality of claw members uniformly distributed along the circumference of the push rod 3, and only a part of the claw members need to be arranged corresponding to the position of the positioning bolt 6.

In the preferred embodiment of the present invention, a stepped structure 61 is provided on the side of the positioning pin 6 facing away from the coil 5, and the end of the ring magnet 4 is engaged with the stepped structure 61 after the positioning pin 6 is withdrawn from the slot 12. This can prevent better that the pilot pin from breaking away from the push rod completely and remaining in the human body.

In the preferred embodiment of the present invention, the side of the slot 12 close to the coil 5 has a first inclined surface 121, and the positioning pin 6 has a second inclined surface 62 corresponding to the first inclined surface 121. The first inclined surface 121 and the second inclined surface 62 are provided to facilitate the spring ring 1 to be withdrawn from the receiving hole 31 of the plunger 3, and the lock pin 6 is withdrawn from the lock groove 12 by the first inclined surface 121 even when the lock pin is not completely withdrawn from the lock groove.

In the preferred embodiment of the invention, the end of the plunger 3 is provided with an annular flange 33 that limits the position of the annular magnet 4. Thus, the ring magnet 4 is not detached from the end of the plunger 3 when receiving the thrust of the coil 5.

The embodiments of the present invention are described above with reference to the drawings, and the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a spring coil electromagnetism release device, its includes spring coil, pipe and sets up the push rod in the pipe, its characterized in that: the end part of the spring ring is provided with a joint part, and the joint part is provided with a clamping groove; an accommodating hole for accommodating the joint part is formed in the end part of the push rod, and the accommodating hole extends along the axial direction of the push rod; the end part of the push rod is further sleeved with an annular magnet and a coil, the annular magnet is closer to the spring ring than the coil, the coil is fixedly connected with the push rod, the annular magnet is movably connected with the push rod and can move along the axial direction of the push rod, a positioning hole penetrating through the accommodating hole and the outer surface of the push rod is formed in the position of the push rod corresponding to the clamping groove, and the positioning hole is closer to the spring ring than the coil; the spring ring electromagnetic release device also comprises a magnetic positioning bolt which can be accommodated in the positioning hole and the clamping groove at the same time; when the ring magnet is located at the locking position, the ring magnet at least partially covers the positioning hole, the ring magnet limits the positioning bolt in the positioning hole and the clamping groove, and the spring ring and the push rod are clamped together by the positioning bolt; when the ring magnet moves from the locking position to the unlocking position under the pushing of the coil, the positioning bolt can be withdrawn from the clamping groove, so that the engagement part of the spring ring can be freely withdrawn from the accommodating hole of the push rod.

2. A spring coil electromagnetic release device as claimed in claim 1, wherein said push rod is further provided with a limit claw for holding said ring magnet in a locked position and releasing the restriction of said ring magnet when said limit claw is located outside said guide tube.

3. A spring coil electromagnetic release device as claimed in claim 2, wherein said limit claws are elastic claws which are restrained by said guide tube to hold said ring magnet in the locked position when said limit claws are located in said guide tube, and which are opened by their own elastic force to release the restriction of said ring magnet when said limit claws are located outside said guide tube.

4. A spring coil electromagnetic release device as claimed in claim 2 or 3, wherein said limit jaw is provided at a position corresponding to said positioning bolt, and abuts against said limit jaw when said positioning bolt is withdrawn from said catching groove.

5. A spring coil electromagnetic release device as claimed in claim 1, wherein a stepped structure is provided on a side of said positioning bolt facing away from said coil, and an end of said ring magnet is engaged with said stepped structure after said positioning bolt is withdrawn from said engaging groove.

6. A spring coil electromagnetic release device as claimed in claim 1, wherein a side of said locking groove adjacent to said coil has a first inclined surface, and said positioning pin has a second inclined surface corresponding to said first inclined surface.

7. A spring coil electromagnetic release device as set forth in claim 1, wherein said end of said push rod is provided with an annular flange for limiting the position of said annular magnet.

8. A spring coil electromagnetic release device as set forth in claim 1, wherein said engagement portion is rod-shaped.