阅读说明：本技术 一种可解脱弹簧圈的解脱机构 (Release mechanism capable of releasing spring ring ) 是由 裴世宁 章仕忠 方晓东 于 2021-09-30 设计创作，主要内容包括：本发明公开了一种可解脱弹簧圈的解脱机构,包括第一锁扣、第二锁扣、固定销,第一锁扣具有相对设置的第一端和第二端,第二锁扣具有相对设置的第三端和第四端,第一锁扣的第二端与第二锁扣的第三端连接；第一锁扣自第一端至第二端设置有第一通孔,第二锁扣自第三端至第四端设置有第二通孔,第一通孔与第二通孔的截面形状相同；固定销包括近段、中间段、远段,固定销的远段的截面形状与第一通孔的截面形状相匹配；固定销被配置为当固定销的远段插入第一通孔和第二通孔时,固定销阻止第一锁扣和第二锁扣的相对转动。本发明结构简单,能快速实现弹簧线圈的锁定与释放,可靠度高,安全性好。(The invention discloses a releasing mechanism capable of releasing a spring ring, which comprises a first lock catch, a second lock catch and a fixing pin, wherein the first lock catch is provided with a first end and a second end which are oppositely arranged; the first lock catch is provided with a first through hole from the first end to the second end, the second lock catch is provided with a second through hole from the third end to the fourth end, and the cross-sectional shapes of the first through hole and the second through hole are the same; the fixing pin comprises a near section, a middle section and a far section, and the cross section of the far section of the fixing pin is matched with that of the first through hole; the fixing pin is configured to prevent relative rotation of the first catch and the second catch when the distal section of the fixing pin is inserted into the first through hole and the second through hole. The invention has simple structure, high reliability and good safety, and can quickly realize the locking and the releasing of the spring coil.)

1. The release mechanism capable of releasing the spring ring is characterized by comprising a first lock catch, a second lock catch and a fixing pin, wherein the first lock catch is provided with a first end and a second end which are arranged oppositely; the first lock catch is provided with a first through hole from a first end to a second end, the second lock catch is provided with a second through hole from a third end to a fourth end, and the cross-sectional shapes of the first through hole and the second through hole are the same; the fixing pin comprises a near section, a middle section and a far section, and the cross section of the far section of the fixing pin is matched with that of the first through hole; the fixing pin is configured to prevent relative rotation of the first and second catches when a distal section of the fixing pin is inserted into the first and second through-holes.

2. The releasable spring ring release mechanism of claim 1, wherein said second end of said primary lock is in meshing engagement with said third end of said secondary lock.

3. The releasable spring ring release mechanism of claim 2, wherein said first lock has a chamfered edge at a second end and said second lock has a chamfered edge at a third end that mates with said second end of said first lock.

4. The releasable spring ring release mechanism of claim 1, wherein said secondary lock-catch includes a first section connected to the third end and a second section connected to the fourth end, said second section of said secondary lock-catch having an outer diameter smaller than an outer diameter of said first section, said second section of said secondary lock-catch having an outer diameter matching an inner diameter of said spring ring.

5. The releasable spring ring release mechanism of claim 4, wherein said second latch second section has an aperture.

6. The releasable spring ring release mechanism of claim 1, wherein said first through-hole is non-circular in cross-sectional shape.

7. The releasable spring ring release mechanism of claim 6, wherein said retaining pin has a proximal section with a circular cross-sectional shape and a middle section with a smooth transition from the proximal section to the distal section.

8. The releasable spring ring release mechanism of claim 2, wherein said first through-hole is circular in cross-sectional shape, and the axis of said first through-hole is not coincident with the axis of said first lock catch.

9. The releasable spring ring release mechanism of claim 8, wherein the proximal section of the retainer pin is circular in cross-sectional shape, the axis of the proximal section of the retainer pin coincides with the axis of the primary lock, and the intermediate section of the retainer pin transitions smoothly from the proximal section to the distal section.

10. The releasable spring ring release mechanism of claim 1, wherein said first end of said primary lock is removably connected to said push rod.

Technical Field

The invention relates to the technical field of conveying devices of medical instruments, in particular to a release mechanism capable of releasing a spring ring.

Background

Hemangioma is a kind of nodular protrusion and arteriovenous malformation of artery or vein wall caused by local abnormal enlargement of artery or vein lumen, and is a common intracranial arteriovenous tumor. The spring ring is a medical apparatus for treating aneurysm, and the spring ring is connected with a stainless steel guide wire and can be directly conveyed into the aneurysm. With the rapid development of embolic coil products, embolic aneurysms are a popular treatment method, which is based on the principle that an embolic coil is used to block a blood vessel at the front end or the rear end of a problematic artery and vein blood vessel, thereby blocking the flow of blood in the blood vessel. The conventional process of embolization of aneurysm is to puncture from femoral artery, put in a guiding catheter, then send a microcatheter into the parent artery through the guiding catheter, and finally send an embolization coil into the aneurysm cavity through the microcatheter, so that the embolization coil is filled in the aneurysm cavity.

However, coils used for aneurysm embolization are less reliable and are prone to accidental embolization once the microcatheter cannot be withdrawn. In the mechanical releasing device of the existing embolism spring ring system, a pushing rod part is a reverse-buckled bowl-shaped ring, a stainless steel wire extends out of the pushing rod part, and a spring ring part is a stainless steel rod with a ball to realize locking and releasing. This type of connection is an active connection, the process of which can cause the release lever to deform or the steel ball to lock, and the steel ball can cause the blood vessel to rupture. In addition, this type of connection is long, which can lead to kicking of the tube during the final phase of the coil conveying process.

Accordingly, those skilled in the art have sought to provide a spring coil release mechanism that reliably provides for installation and release, and that improves the stability of spring coil delivery.

Disclosure of Invention

In view of the shortcomings of the prior art, the present invention is directed to a release mechanism that can be reliably installed and released to improve the stability of embolic coils delivered in a blood vessel.

In order to achieve the above object, the present invention provides a releasing mechanism capable of releasing a spring ring, including a first lock catch, a second lock catch, and a fixing pin, wherein the first lock catch has a first end and a second end that are opposite to each other, the second lock catch has a third end and a fourth end that are opposite to each other, the first end of the first lock catch is used for connecting a push rod, and the second end of the first lock catch is connected to the third end of the second lock catch; the first lock catch is provided with a first through hole from a first end to a second end, the second lock catch is provided with a second through hole from a third end to a fourth end, and the cross-sectional shapes of the first through hole and the second through hole are the same; the fixing pin comprises a near section, a middle section and a far section, and the cross section of the far section of the fixing pin is matched with that of the first through hole; the fixing pin is configured to prevent relative rotation of the first and second catches when a distal section of the fixing pin is inserted into the first and second through-holes.

The fourth end of the second lock catch is used for connecting the spring ring, and the spring ring is connected with the push rod through the first lock catch and the second lock catch. The cross section of the first through hole is a plane perpendicular to the direction from the first end to the second end of the first lock catch, and the cross section of the second through hole is a plane perpendicular to the direction from the third end to the fourth end of the second lock catch. The far section of the fixing pin is a section inserted into the first through hole and the second through hole, the far section is connected with the first through hole and the second through hole and is a middle section, and the other opposite end is a near section. When the fixing pin is inserted into the first through hole and the second through hole, the relative rotation of the first lock catch and the second lock catch can be prevented; when the fixing pin is moved out of the first through hole and the second through hole, the first lock catch and the second lock catch can rotate relatively.

The fixing pin of the invention is equivalent to the internal traction wire of the push rod.

Further, the second end of the first lock catch is engaged with the third end of the second lock catch.

The first lock catch and the second lock catch are movably connected, and the first lock catch and the second lock catch can rotate relatively in a meshed connection mode.

Preferably, the second end of the first lock catch is provided with a chamfered notch, and the third end of the second lock catch is provided with a chamfered notch matched with the second end of the first lock catch.

The second end of the first lock catch and the third end of the second lock catch can also be slot-shaped notches and the like.

Further, the second lock catch comprises a first section connected with the third end and a second section connected with the fourth end, the outer diameter of the second section of the second lock catch is smaller than that of the first section, and the outer diameter of the second section of the second lock catch is matched with the inner diameter of the spring ring.

Through with the external diameter of the second section of second hasp and the internal diameter phase-match of spring coil realize with the spring coil cover on the second section of second hasp, realize being connected of second hasp and spring coil.

Furthermore, a second section of the second lock catch is provided with a hole.

The opening on the second section of the second lock catch is used for fixing the anti-untwisting line, and the anti-untwisting line is fixed with the spring ring.

Preferably, the first through hole has a non-circular cross-sectional shape.

Similarly, the second through hole and the distal section of the fixing pin are also non-circular in cross-sectional shape, so that relative rotation of the first and second catches is prevented.

Further, the section shape of the proximal section of the fixing pin is circular, and the middle section of the fixing pin smoothly transits from the proximal section to the distal section.

The cross-sectional shapes of the middle section of the fixing pin and the far section of the fixing pin are different, so that the fixing pin and the first lock catch can be positioned.

Preferably, the cross-sectional shape of the first through hole is circular, and the axis of the first through hole is not coincident with the axis of the first lock catch.

Similarly, the second through hole and the distal section of the fixing pin are also circular in cross-sectional shape, so that relative rotation of the first lock catch and the second lock catch can be prevented because the axis of the first through hole is not coincident with the axis of the first lock catch.

Further, the cross-sectional shape of the proximal section of the fixing pin is circular, the axis of the proximal section of the fixing pin coincides with the axis of the first lock catch, and the middle section of the fixing pin is in smooth transition from the proximal section to the distal section.

The middle section and the far section of the fixing pin have a certain included angle, so that the fixing pin and the first lock catch can be positioned.

Furthermore, the first end of the first lock catch is detachably connected with the push rod.

Can be breakable connection between first hasp and the push rod, when needs are liberated the release mechanism, through rupture push rod with the connection of first hasp, alright stimulate the fixed pin realizes the release of release mechanism.

The invention has at least the following beneficial technical effects:

1. according to the invention, the first lock catch and the second lock catch with the holes are arranged, and the shape of the fixing pin is matched with the holes, so that the first lock catch and the second lock catch are relatively fixed, and the locking of the release mechanism is kept.

2. The release mechanism has the advantages of simple structure, high reliability, small size, compact and short locking and release mechanism, and no influence on the overall smoothness of the embolic coil system.

3. The releasing mechanism can adopt laser processing and traditional mechanical processing, and has high processing precision and good economical efficiency.

4. The releasing mechanism of the invention cancels the convex stainless steel wire and the like in the existing design, uses a smoother structure, avoids the penetration to the wall of the aneurysm or the vessel wall and has higher safety.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a schematic view of the connection of a release mechanism for a releasable spring coil provided in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic view of the connection of the release mechanism for the releasable spring coil provided in accordance with the preferred embodiment of the present invention;

FIG. 3 is a first schematic locking view of a release mechanism for the releasable spring coil provided in accordance with a preferred embodiment of the present invention;

FIG. 4 is a second locking schematic of the release mechanism for the releasable spring coil provided in accordance with the preferred embodiment of the present invention;

FIG. 5 is a schematic view of the locking of the release mechanism for the releasable spring coil provided in accordance with the preferred embodiment of the present invention;

FIG. 6 is an assembled view of a release mechanism for a releasable spring coil provided in accordance with a preferred embodiment of the present invention;

fig. 7 is an assembled side view of a release mechanism for a releasable spring coil provided in accordance with a preferred embodiment of the present invention.

In the figure, 1-primary catch, 2-secondary catch, 3-anchor pin, 4-push rod, 5-spring ring, 6-anchor hole, 7-anti-unwinding line, 8-first weld, 9-second weld, 10-release pull wire, 11-PTFE tube.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

Fig. 1 and 2 show a schematic connection of the release mechanism for a releasable spring coil according to the invention for connecting a push rod 4 and a spring coil 5. The novel lock catch comprises a first lock catch 1, a second lock catch 2 and a fixing pin 3, wherein the first lock catch 1 is provided with a first end and a second end which are arranged oppositely, the second lock catch 2 is provided with a third end and a fourth end which are arranged oppositely, the first end of the first lock catch 1 is connected with a push rod 4, the fourth end of the second lock catch 2 is connected with a spring ring 5, and the second end of the first lock catch 1 is connected with the third end of the second lock catch 2. The connection of the spring ring 5 and the push rod 4 is realized through the first lock catch 1 and the second lock catch 2.

The first lock catch 1 is provided with a first through hole from the first end to the second end, the second lock catch 2 is provided with a second through hole from the third end to the fourth end, and the cross-sectional shapes of the first through hole and the second through hole are the same; the cross section of the first through hole is a plane perpendicular to the direction from the first end to the second end of the first lock catch 1, and the cross section of the second through hole is a plane perpendicular to the direction from the third end to the fourth end of the second lock catch 2.

The fixing pin 3 comprises a near section, a middle section and a far section, and the cross section of the far section of the fixing pin 3 is matched with that of the first through hole; when the distal section of the fixing pin 3 is inserted into the first and second through-holes, the fixing pin 3 prevents the relative rotation of the first and second lockers 1 and 2. The far section of the fixing pin 3 is a section inserted into the first through hole and the second through hole, the far section is connected with the first through hole and the second through hole to form a middle section, and the other opposite end is a near section; i.e. from left to right as seen in fig. 1, the fixation pin 3 has a proximal section, a middle section and a distal section in that order.

When the fixing pin 3 is inserted into the first through hole and the second through hole, the relative rotation of the first lock catch 1 and the second lock catch 2 can be prevented, and the middle section and the near section of the fixing pin 3 are positioned in the push rod 4; when the fixing pin 3 is moved out of the first through hole and the second through hole, the first lock catch 1 and the second lock catch 2 can rotate relatively. The fixing pin 3 of the present invention corresponds to an internal pull wire of the push rod 4, and a release pull wire 10 is connected to a proximal section of the fixing pin 3. The release pull wire 10 may be connected to the fixing pin 3 by welding.

As shown in fig. 1 and 2, a PTFE tube 11 may be further disposed on the outer side of the push rod 4, and the PTFE tube 11 is sleeved on the outer side of the push rod 4 by heat shrinkage.

The first lock catch 1 is movably connected with the second lock catch 2, the second end of the first lock catch 1 can be meshed with the third end of the second lock catch 2, and the first lock catch 1 and the second lock catch 2 can rotate relatively in a meshed connection mode.

The second lock catch 2 comprises a first section connected with the third end and a second section connected with the fourth end, the outer diameter of the second section of the second lock catch 2 is smaller than that of the first section, and the outer diameter of the second section of the second lock catch 2 is matched with the inner diameter of the spring ring 5. The outer diameter of the second section of the second lock catch 2 is matched with the inner diameter of the spring ring 5, the spring ring 5 is sleeved on the second section of the second lock catch 2, and the second lock catch 2 is connected with the spring ring 5.

The second section of the second lock catch 2 is provided with a fixing hole 6, the fixing hole 6 is used for fixing an anti-untwisting line 7, and the anti-untwisting line 7 is fixed with the spring ring 5. The number of the fixing holes 6 may be two, and are oppositely disposed on the circumference of the second section of the second lock catch 2.

For dismantling the connection between the first end of first hasp 1 and push rod 4, when needs are liberated the disengagement mechanism, through breaking push rod 4 and being connected of first hasp 1, alright pulling fixed pin 3 realizes the disengagement of disengagement mechanism.

Can be connected through first welding point 8 between first hasp 1 and the push rod 4, when needs are liberated the release mechanism, can with the break of first welding point 8. The first welding points 8 are spot-welded, and four welding points are arranged along the circumferential direction.

The second lock catch 2 and the spring ring 5 can be connected by a second welding point 9, and the second welding point 9 can be continuous welding or spot welding.

The structure of the assembled first latch 1, second latch 2, fixing pin 3 and push rod 4 of the present invention is shown in fig. 6 and 7.

The use mode of the releasing mechanism of the releasable spring ring is as follows: the first lock catch 1 and the second lock catch 2 are matched in place, the fixing pin 3 is inserted and penetrates through the first through hole of the first lock catch 1 and the second through hole of the second lock catch 2, and the first lock catch 1 and the second lock catch 2 are locked; further advancing the fixing pin 3 to a certain position to reach a limiting point; when needs are disengaged, the connecting end of the push rod 4 is broken, the fixing pin 3 is pulled by the aid of the disengaged traction wire 10, the fixing pin 3 withdraws, the first lock catch 1 and the second lock catch 2 lose the limit, the first lock catch 1 can be disengaged from the second lock catch 2, and the second lock catch 2 is left in a human body along with the spring ring 5.

Example 1

As shown in fig. 2 to 5, the second end of the first lock catch 1 is provided with two chamfered notches, and the third end of the second lock catch 2 is provided with a chamfered notch matched with the second end of the first lock catch 1, and the second end of the first lock catch 1 and the third end of the second lock catch 2 are engaged together through the chamfered notches to form a movable connection, wherein the engagement form is shown in fig. 4 and 5.

In this embodiment, the pitch of the oblique cuts of the first lock catch 1 and the second lock catch 2 may be 0.3mm, and the oblique cuts may be cut by laser processing.

The cross-sectional shapes of the first through hole of the first lock catch 1 and the second through hole of the second lock catch 2 are flat, and the length direction of the flat is an asymmetric structure, i.e. a tapered structure, which can also be described as a gradually expanding structure.

The section shape of the far section of the fixing pin 3 is flat matched with the section of the first through hole of the first lock catch 1, so that the far section of the fixing pin 3 can extend into the first through hole and the second through hole. The fixing pin 3 is made of round wires, the round wires are punched by a die, the far section of the fixing pin 3 is processed into flat wires, the near section of the fixing pin 3 is still made of the round wires, and the middle section of the fixing pin 3 is in transition from the round wires to the flat wires.

As shown in fig. 6, the transition portion of the intermediate section of the fixing pin 3 forms a limit to limit the depth of the fixing pin 3 extending into the first and second through holes.

Example 2

The present embodiment is different from embodiment 1 in that the cross-sectional shapes of the first through-hole of the first lock catch 1 and the second through-hole of the second lock catch 2 are circular, but the axis of the first through-hole does not coincide with the axis of the first lock catch 1, and accordingly, the axis of the second through-hole does not coincide with the axis of the second lock catch 2.

The distal section of the fixing pin 3 is also circular in cross-sectional shape and matches the first through hole. In this embodiment, the axis of the proximal section of the fixation pin 3 coincides with the axis of the pushing rod 4, and therefore the axis of the distal section of the fixation pin 3 does not coincide with the axis of the proximal section. There is the contained angle in the interlude of fixed pin 3 and far-end section, and the interlude of fixed pin 3 also plays spacing effect, and the restriction fixed pin 3 is to the degree of depth that stretches into of first through-hole and second through-hole.

According to the release mechanism capable of releasing the spring ring, the first lock catch and the second lock catch with the holes are arranged, and the shape of the fixing pin is matched with the holes, so that the first lock catch and the second lock catch are relatively fixed, and the locking of the release mechanism is kept; the release mechanism has the advantages of simple structure, high reliability, small designed size, compact and short locking and release mechanism, and no influence on the overall smoothness of the embolic coil system; the releasing mechanism can adopt laser processing and traditional mechanical processing, and has high processing precision and good economical efficiency; the releasing mechanism of the invention cancels the convex stainless steel wire and the like in the existing design, uses a smoother structure, avoids the penetration to the wall of the aneurysm or the vessel wall and has higher safety.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.