CN209932893U

CN209932893U - Thrombus taking device

Info

Publication number: CN209932893U
Application number: CN201821697603.1U
Authority: CN
Inventors: 王玉峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-10-19
Filing date: 2018-10-19
Publication date: 2020-01-14
Anticipated expiration: 2028-10-19

Abstract

The utility model provides a bolt taking device, which comprises a protective frame arranged on an outer ring and a bolt taking bracket arranged on an inner ring; the protective frame is sleeved on the outer side of the thrombus taking support and used for adhering thrombus to the wall and establishing a channel; a sliding channel is arranged in the protective frame along the length direction of the blood vessel; the thrombus taking support can be arranged in the sliding channel in a reciprocating sliding mode along the axial direction of the protection frame and is used for capturing thrombus. The utility model discloses simple structure, it is easy and simple to handle, because the thrombectomy support removes in sliding channel, not with vascular wall direct contact, so catch many times and can not draw the vascular inner wall of hindering yet, when improving the thrombectomy success rate, shorten operation time, reduce because fish tail blood vessel and the complication that cerebral ischemia time overlength leads to.

Description

Thrombus taking device

Technical Field

The utility model belongs to the technical field of the medical instrument technique and specifically relates to a get and tie device suitable for operation is tied to acute getting in arteriovenous blood vessel.

Background

In China, acute stroke is the third leading cause of death and the first cause of disability. According to statistics, about 200 million new strokes occur every year in China, about 150 million people die of stroke in each year, about 650 million people are stroke survivors, and the direct cost for stroke in China is over 200 million yuan every year, wherein ischemic stroke accounts for about 85% of all patients.

Once acute cerebral ischemic stroke occurs, how to rapidly remove thrombus blocking blood vessels is the key of successful treatment, and two conventional treatment methods are adopted, namely firstly, the thrombus is dissolved by thrombolytic drugs; secondly, the thrombus is taken out through the mechanical thrombus taking device, the first mode is to dissolve the thrombus through medicines, the treatment time window is narrow, the recanalization rate is low, and the bleeding risk is high, and the second mode is to directly take out the thrombus through the thrombus taking device, so that the blood vessel can be quickly opened, and the thrombus taking device is an important treatment means for patients suffering from acute ischemic stroke.

The existing thrombus taking device is disclosed as an intracranial thrombus taking device in Chinese patent CN203379185U, and the intracranial thrombus taking device comprises a thrombus taking support capable of expanding and contracting in the radial direction. In the conventional thrombus removal mode, the retention force between the thrombus removal stent and the thrombus is the key for success of thrombus removal

The retention force of the independent thrombus removal support is unstable, and particularly in the process that the support is withdrawn from the body from an embolism position, the diameter of the thrombus removal support is caused due to the bending of a blood vessel and the continuous change of the diameter of the blood vessel, meshes are changed, and the retention force of the support is further changed, and in addition, the impact of blood flow, the friction with the blood vessel wall and the unstable characteristic of thrombus are caused, so that the thrombus is easy to fall off to cause thrombus removal failure. Of course, thrombus formation in other parts of the human body or tissue organs than the brain is also very dangerous, and in an emergency situation, the thrombus needs to be removed by a mechanical thrombus removal device.

The number of times of thrombus removal in the current emergency thrombus removal operation is generally not more than 3, because the whole existing thrombus removal support is in direct contact with the blood vessel wall, the blood vessel wall is easily damaged in the back-and-forth release and pull-back processes, and complications are caused.

In addition, after the existing surgical equipment finishes one-time capturing action, the capturing equipment must be completely withdrawn from the body, the reconstructed image judges whether thrombus is completely and successfully captured or not, and if not, the blood vessel is not communicated, and the equipment needs to be re-installed and captured again. Therefore, much time is wasted, and in the embolectomy, the time is the brain, and even in a time window, blood vessels need to be opened as soon as possible. The incidence of complications beyond a specified time window is almost unacceptable, and there is a need for an instrument that effectively reduces the time of the procedure

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a thrombectomy device to the success rate of thrombectomy that exists among the solution prior art is lower, and the operation is complicated, the long or great technical problem of complication probability of operation time.

In order to solve the technical problem, the utility model provides a pair of thrombectomy device, include: the outer ring is provided with a protection frame and the inner ring is provided with a bolt taking support;

the protective frame is sleeved on the outer side of the bolt taking bracket;

a sliding channel is arranged in the protective frame along the length direction of the blood vessel;

the thrombus taking support can be arranged in the sliding channel in a reciprocating sliding mode along the axial direction (the length direction of the blood vessel) of the protective frame and is used for capturing thrombus.

The utility model discloses simple structure, and is easy and simple to handle, utilize little pipe to deliver to artery or venous thrombus position with thrombectomy device, withstand thrombectomy support's control seal wire withdrawal little pipe, thrombectomy device releases from little pipe, wherein the protection frame is radial expansion and open under the effect of self tension and release tension, the inside sliding channel who embolias the support that forms of protection frame, the thrombus is through in the grid part inlays embedding sliding channel on the protection frame, remove thrombectomy support and can accomplish the seizure in the protection frame with the thrombus is whole to be dragged into, after catching the failure, can reciprocate to remove many times in sliding channel and thrombectomy support until accomplishing the seizure. Because the thrombus taking support moves in the sliding channel and is not in direct contact with the blood vessel wall, the thrombus taking support can not scratch the inner wall of the blood vessel after being captured for many times, thereby improving the thrombus taking success rate, reducing the operation time and reducing the complications caused by scratching the blood vessel.

Further, still including stabilizing the seal wire, embolectomy support slidable ground suit is in stabilize on the seal wire, it is on a parallel with to stabilize the seal wire the fender bracket the central axis sets up and is used for spacing and direction when embolectomy support slides, can prevent simultaneously that embolectomy support distal end from stabbing the blood vessel.

Further, the stabilizing guidewire is made of a material that is opaque to X-rays.

Preferably, the stable guide wire is made of medical metal such as stainless steel, titanium, nickel-titanium alloy or cobalt-based alloy, and the like, and the guide wire is externally plated or wound with Au, Pt, W, Ta and other materials with high X-ray blocking rate.

Further, still include the control seal wire, the control seal wire with it ties the support connection to get for drive it removes to get to tie the support.

Furthermore, the thrombus taking support is provided with lantern rings at two ends in the axial direction, and the thrombus taking support is slidably sleeved on the stable guide wire through the two lantern rings.

Preferably, the control guide wire is fixedly connected with a loop at the proximal end (i.e. the end close to the control guide wire) of the embolectomy stent.

Further, a ball head is arranged at the far end of the stabilizing guide wire, which is far away from the control guide wire.

Furthermore, the near end of the protection frame is fixedly connected with the stable guide wire, and the far end of the protection frame is connected with the stable guide wire in a sliding mode through a clamping ring.

The clamping ring is slidably sleeved on the stabilizing guide wire, the far end of the stabilizing guide wire extends out of the inside of the embolectomy support, and when the outer diameter of the protection frame changes, the clamping ring moves along the stabilizing guide wire.

Wherein, preferably, the protective frame and/or the embolectomy support are made of stainless steel or nickel-titanium alloy.

Further, the length of the protective frame is greater than the length of the thrombus, i.e. in the length direction, the protective frame completely covers the thrombus after being released.

Further, the length of the embolectomy support is 1/6-1/2 of the length of the protection frame.

Furthermore, the protection frame is of a radial expandable and contractible woven mesh structure, and two X-ray-proof metal wires spirally extend from the position of the near-end snap ring to the position of the far-end snap ring, so that the condition of opening the protection frame can be observed conveniently.

The bolt-taking support is a closed-loop support formed by laser engraving or welding. The general engraving support is formed by arranging and combining a plurality of groups of radial wave-shaped support rings in a front-back mode along the axial direction, if the wave troughs and the wave crests corresponding to the front and the back wave-shaped rings are connected to form a closed-loop support, the wave troughs and the wave troughs of the front and the back wave-shaped rings are connected to form an open-loop support, and the wave troughs of the front and the. The closed loop stent is recoverable after being released, and the open loop stent is not recoverable.

The embolectomy support can be the prior art, and the structure of the embolectomy support is not described in too much detail.

Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect has:

the utility model provides a pair of thrombectomy device, the utility model discloses simple structure, it is easy and simple to handle, because thrombectomy support removes in sliding channel, not with vascular direct contact, so catch many times and can not draw the vascular inner wall of hindering yet, when improving thrombectomy success rate, shorten operation time, reduced because fish tail blood vessel and cerebral ischemia time overlength lead to the complication.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the description in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a thrombus removal device according to an embodiment of the present invention.

Reference numerals:

1-stabilizing the guidewire; 2-a ball head; 3-a snap ring; 4-a protection frame; 5-a collar; 6-thrombus taking support; 9-control guide wire.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model provides a pair of bolt taking device, include: the outer ring is provided with a protection frame and the inner ring is provided with a bolt taking support;

the protective frame is sleeved on the outer side of the thrombus taking support and used for adhering thrombus to the wall and establishing a blood flow channel;

The utility model discloses simple structure, and is easy and simple to handle, utilize little pipe to send the thrombi position of artery or vein with thrombi taking device, withstand and tie device control seal wire withdrawal little pipe, thrombi taking device releases from little pipe, wherein the protection frame is radial expansion and open under the effect of self tension and release tension, the inside sliding channel who ties the support of getting of fender bracket that forms, the thrombus is through the grid part inlay slip channel on the fender bracket, remove and get the support of thrombi and can smooth out the thrombus to the sliding channel completely in, the complete capture, after catching the failure, can be in the slip channel reciprocal multiple movement in the support of thrombi taking until accomplishing the seizure. Because the thrombus taking support moves in the sliding channel and is not in direct contact with the blood vessel, the inner wall of the blood vessel cannot be scratched after multiple times of catching, the thrombus taking success rate is improved, the operation time is shortened, and complications caused by blood vessel scratching and long cerebral ischemia time are reduced.

The present invention will be further explained with reference to specific embodiments.

As shown in fig. 1, the present embodiment provides a thrombus removal device, including: a protective frame 4 arranged on the outer ring and a bolt-taking bracket 6 arranged on the inner ring.

The protective frame 4 is sleeved on the outer side of the bolt taking support 6, the protective frame 4 is in an elastic design, and under the action of self elasticity, the protective frame 4 expands in the radial direction and is completely opened under the action of releasing tension; a sliding channel is arranged in the protective frame 4 along the length direction of the blood vessel; the thrombus removal support 6 is arranged in the sliding channel in a reciprocating sliding manner along the axial direction (the length direction of the blood vessel) of the protection frame 4 and is used for capturing thrombus. The protective frame is arranged between the thrombus taking support and the inner wall of the blood vessel, so that the thrombus taking support can be prevented from scratching the blood vessel when moving.

The utility model discloses simple structure, and is easy and simple to handle, utilize little pipe to send the thrombi position of artery or vein with thrombi taking device, withstand and tie device control seal wire withdrawal little pipe of taking, the thrombi taking device releases from little pipe, wherein fender bracket 4 radially expands and opens under the effect of self tension and release tension, the inside sliding channel who ties support 6 of taking of fender bracket 4 forms, the thrombus is inlayed through 4 upper net check parts of fender bracket and is inlayed embedding sliding channel, remove and get and tie support 6 and can drag the thrombus to sliding channel completely, the completion is caught, after catching the failure, can be in sliding channel reciprocating multiple removal and get and tie support 6 until the completion and catch. Because the thrombus taking support 6 moves in the sliding channel and is not in direct contact with the blood vessel, the inner wall of the blood vessel cannot be scratched after multiple times of catching, and the complication caused by scratching the blood vessel is reduced while the thrombus taking success rate is improved.

This embodiment still includes and stabilizes the seal wire 1, embolectomy support 6 slidable ground suit is in stabilize on the seal wire 1, it is on a parallel with to stabilize seal wire 1 4 the central axis sets up and is used for spacing and direction when embolectomy support 6 slides, can prevent simultaneously that embolectomy support distal end from stabbing the blood vessel.

The stabilizing guide wire 1 is made of a material that is opaque to X-rays.

The stable guide wire 1 is preferably made of medical metal such as stainless steel, titanium alloy or cobalt-based alloy, and the like, and the guide wire is externally plated or wound with high X-ray blocking rate materials such as Au, Pt, W and the like.

The embodiment further comprises a control guide wire 9, wherein the control guide wire 9 is connected with the embolectomy support 6 and used for driving the embolectomy support 6 to move.

The thrombus removal support 6 is provided with lantern rings 5 at two axial ends, and the thrombus removal support 6 is slidably sleeved on the stabilizing guide wire 1 through the two lantern rings 5.

Wherein, preferably, the control guide wire 9 is fixedly connected with the loop 5 at the proximal end of the embolectomy stent 6 (i.e. the end close to the control guide wire 9).

The far end of the stable guide wire 1 is provided with a ball head 2. The near end of the protection frame 4 is fixedly connected with the stable guide wire 1, and the far end of the protection frame 4 is connected with the stable guide wire 1 in a sliding mode through a clamping ring 3.

Wherein snap ring 3 slidable suit is in stabilize seal wire 1, and the distal end of stabilizing seal wire 1 stretches out from the inside of support, and when the fender bracket 4 external diameter changed, snap ring 3 also removed along stabilizing seal wire 1 thereupon. Wherein, preferably, the protective frame 4 and/or the bolt taking bracket 6 are made of stainless steel or titanium alloy.

In use, a thick therapeutic passage catheter such as a guide catheter, an intermediate catheter or a distal passage catheter is first placed in a position as close as possible to a thrombus-clogged blood vessel. The special catheter (micro-catheter) of the thrombus removal device is passed through the thrombus with the help of the micro-guide wire and reaches the distal end of the thrombus, and then the thrombus removal device is sent to the thrombus through the micro-catheter.

The control guide wire which is pressed against the proximal end of the thrombus taking bracket withdraws the special catheter, and the thrombus taking device is released at the thrombus. The thrombus taking support and the protective frame can be fully opened under the action of tension by pushing and pulling the control guide wire and the micro catheter.

When the thrombus taking support and the protective frame are completely opened, the position of the thrombus is observed by radiography. The control guide wire is pushed to enable the thrombus taking support to move to the far end from the inner near end of the protection frame along the stable guide wire.

The control guide wire is pulled back to return the thrombectomy stent to the proximal end of the protective frame. The thrombus position was observed by imaging. If the position of the thrombus is obviously changed, the thrombus is captured, if the position of the thrombus is not changed, the thrombus may not be captured, and the control guide wire is repeatedly pushed and pulled, so that the thrombus taking support moves in the protective frame until the thrombus is captured.

And finally, the control guide wire is pulled back, the thrombus taking support and the protective frame are pulled into the therapeutic access catheter, and the thrombus taking support and the protective frame are pulled out of the body.

The bolt taking device is composed of an inner layer of support and an outer layer of support, the protective frame is of a radial expandable and contractible woven mesh structure, the bolt taking support is a closed loop support formed in a laser engraving or welding mode, and the bolt taking support is also arranged in an expandable and contractible mode in the radial direction.

The length of the protective frame is larger than that of the thrombus, namely, the protective frame completely covers the thrombus after being released in the length direction, and the specific size can be set according to clinical experience values.

The length of the embolectomy support is 1/6-1/2 of the length of the protective frame.

The thrombus taking support needs to have good trafficability, so the thrombus taking support needs to be short, the protective frame is used as a sliding channel of the thrombus taking support, and the thrombus position is not easy to judge due to the blockage of the blood vessel by the thrombus, so the protective frame needs to be long, and the thrombus position can be conveniently and completely covered.

The protective frame is not directly connected with the control rod and is controlled by the bolt taking bracket. The stent is always at the proximal end of the protective frame when the stent is released and retrieved.

When the protective frame is opened, the control rod is pushed or withdrawn, the thrombus taking support can move towards the far end or the near end in the protective frame, and thrombus inlaid in the protective frame is smoothed into the protective frame to complete capture.

After the thrombus taking support completes one-time reciprocating motion in the protective frame, whether thrombus is captured or not can be judged through radiography, if the thrombus is not captured successfully, the capturing action can be repeated, and therefore the operation time can be saved.

After the existing surgical equipment finishes one-time catching action, the catching equipment must be completely withdrawn from the body, the reconstruction image judges whether thrombus is successfully caught or not, if not, the equipment needs to be re-installed, so that a lot of time is wasted, the requirement on a thrombus taking surgical time window is very strict, and the occurrence probability of complications is multiplied after the specified time is exceeded, so that the equipment capable of effectively reducing the surgical time is needed.

The number of times of thrombus removal in the current emergency thrombus removal operation is generally not more than 3, and the reason is that the whole thrombus removal stent is in direct contact with a blood vessel wall, so that the blood vessel wall is easily damaged in the back-and-forth release and pull-back processes, and complications are caused. The thrombus taking support always slides in the channel established by the protective frame and does not contact with the vessel wall, so that the vessel is not damaged even if the thrombus taking support is operated for many times. When the braided protective frame is retracted, the radial diameter of the protective frame is retracted to be reduced due to axial tension, so that the friction force on the vessel wall can be greatly reduced, and the purpose of reducing the vessel injury is achieved. Meanwhile, the diameter of the protective frame is retracted in the recovery process, so that the protective frame tightly wraps the thrombus and can also play a role in preventing the thrombus from escaping.

In a word, the utility model discloses can effectively improve the success rate that snatchs of thrombus, prevent that the thrombus from escaping to can reduce the support and pull the in-process and to the damage of vascular wall, can also shorten operation time, reduce the emergence of complication.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A thrombectomy device, comprising: the outer ring is provided with a protection frame and the inner ring is provided with a bolt taking support;

the protective frame is sleeved on the outer side of the bolt taking bracket;

the thrombus taking support can be arranged in the sliding channel in a reciprocating sliding mode along the axial direction of the protection frame and is used for capturing thrombus.

2. The embolectomy device of claim 1, further comprising a stabilizing guide wire, wherein the embolectomy support is slidably sleeved on the stabilizing guide wire, and the stabilizing guide wire is parallel to the central axis of the fender bracket and is used for limiting and guiding the sliding of the embolectomy support.

3. The embolectomy device of claim 2, wherein the stabilizing guidewire is made of a radiopaque material.

4. The embolectomy device of claim 2, further comprising a control guide wire connected to the embolectomy support for moving the embolectomy support.

5. The embolectomy device of claim 4, wherein collars are arranged at two ends of the embolectomy support in the axial direction, and the embolectomy support is slidably sleeved on the stable guide wire through the two collars.

6. The embolectomy device of claim 4, wherein the distal end of the stabilizing guidewire is provided with a bulb.

7. The embolectomy device of claim 4, wherein the proximal end of the protective frame is fixedly connected with the stabilizing guidewire, and the distal end of the protective frame is slidably connected with the stabilizing guidewire through a snap ring.

8. The embolectomy device of claim 7, wherein the snap ring is slidably sleeved over the stabilizing guidewire, the distal end of the stabilizing guidewire extends from the interior of the embolectomy support, and the snap ring moves along the stabilizing guidewire as the outer diameter of the fender bracket changes.

9. The embolectomy device of claim 1, wherein the length of the protective frame is greater than the length of the thrombus, i.e., in the longitudinal direction, the protective frame completely covers the thrombus after release.

10. The embolectomy device of claim 1, wherein the cage is a radially expandable and contractible woven mesh structure and has two X-ray opaque wires extending helically from a proximal clasp to a distal clasp to facilitate viewing of the cage open.