CN115919405A - Blood vessel foreign matter extraction auxiliary device and extraction device - Google Patents

Abstract

The application relates to a blood vessel foreign matter extraction auxiliary device, and the improvement is that the device comprises a dense net support, wherein the dense net support is in a cover body structure with an opening at the far end and a contraction at the near end in a self-expansion state, and an arc transition section is arranged between the far end and the near end of the dense net support so as to facilitate the contraction of the dense net support into an outer pipe; the far end of the conveying pipe is connected with the near end of the dense net support, and the near end of the conveying pipe is connected to a conveying pipe joint; a tearable recovery sheath is arranged on the conveying pipe close to the joint of the conveying pipe; the dense net support is in through connection with the conveying pipe to be matched with the foreign matter extraction support to complete extraction operation. The dense mesh stent adopted by the application is completely attached to the vascular wall, the problem of vascular embolism complications at the near end of the traditional thrombus removal technology is solved, thrombus can be completely removed, and no residue is left.

Description

Blood vessel foreign matter extraction auxiliary device and extraction device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a blood vessel foreign body extraction auxiliary device and an extraction device.

Background

Thrombus refers to a solid mass formed by coagulation of tangible components in circulating blood in a blood vessel, which can partially or completely block the blood vessel and cause blood supply disorder at the corresponding part. For patients who have already been treated by internal medicine and have poor effect or serious thrombus blockage, better treatment effect can be achieved through surgical intervention. The current surgical intervention mainly comprises catheter suction, stent embolectomy and combined use of the two.

For peripheral vascular embolization, peripheral embolization stents are often used in conjunction with aspiration catheters. Generally, the size of the thrombus taking bracket is larger than that of the suction catheter, so that when thrombus is pulled from the thrombus taking bracket to enter the suction catheter, part of the thrombus can be cut from the thrombus taking bracket by the suction catheter, the thrombus is scratched and falls off, the fallen thrombus can be washed into a blood vessel at a far end by blood flow, secondary embolism is caused, and the life safety of a patient is threatened.

At the same time, there are inevitable risks in complicated surgery. Problems such as displacement of the medical device, embolism, or improper function of the implant may require a rescue procedure to remove the device. The ability to safely remove and remove the displaced medical instrument is also very important at this time.

Disclosure of Invention

In order to solve the above-mentioned disadvantages in the prior art, the present invention provides a vascular foreign body extraction device, comprising:

the dense mesh support is in a cover body structure with an opening at the far end and a contraction at the near end in a self-expansion state, and an arc-shaped transition section is arranged between the far end and the near end of the dense mesh support so as to facilitate the dense mesh support to be contracted into the outer pipe;

the far end of the conveying pipe is connected with the near end of the dense mesh bracket, and the near end of the conveying pipe is connected to a conveying pipe joint; a tearable recovery sheath is arranged on the conveying pipe close to the joint of the conveying pipe;

the dense net support and the conveying pipe are in through connection to be matched with the foreign matter extraction support to finish extraction operation.

Preferably, the outer diameter of the delivery pipe is smaller than the inner diameter of the outer pipe, so that the dense mesh stent is released after the delivery pipe is delivered to a specified position by the outer pipe.

Preferably, the dense mesh bracket is a high-density dense mesh cover body, is woven by nickel-titanium wires with the diameter of 0.08-0.12 mm, and is processed by heat treatment and shaping; the aperture of the meshes of the dense mesh bracket is 0.1mm-0.5mm; the diameter range of the dense mesh scaffold is 3mm-50mm. Preferably, the distal end of dense net support is the cylinder, and the maximum diameter and the vascular wall diameter after the support expandes match, cylinder outer wall can closely laminate the vascular inner wall.

Preferably, the port at the far end of the dense mesh stent is of a closed structure.

Preferably, the apparatus further comprises: the developing ring is an annular object and is coaxially arranged at the joint of the bracket and the conveying pipe.

Preferably, the tearable recovery sheath is cylindrical, coaxially arranged outside the delivery pipe and capable of moving along the delivery pipe;

one end of the tearable recovery sheath is provided with a notch.

Preferably, the delivery pipe joint comprises:

the main body far end, the main body and the connecting buckle are coaxially and sequentially connected;

the far end of the main body, the main body and the connecting buckle are all hollow structures so as to put the foreign body extraction bracket into the conveying pipe.

Preferably, the delivery pipe joint further comprises:

a deformation pad matching an inner diameter of the body and disposed within the body; the inner diameter of the main body is also provided with a limiting structure for limiting the deformation pad;

the connecting buckle is an annular body with a bottom, and the inner diameter of the connecting buckle is matched with the outer diameter of the main body; the bottom of the connecting buckle is provided with a boss which is coaxial with the main body;

the connecting buckle is movably connected with the main body so as to extrude the boss to the deformation pad.

The application also relates to a foreign matter extraction device comprising an auxiliary device, the improvement of which is that the device comprises,

the dense mesh support is in a cover body structure with an opening at the far end and a contraction at the near end in a self-expansion state, and an arc-shaped transition section is arranged between the far end and the near end of the dense mesh support so as to facilitate the dense mesh support to be contracted into the outer pipe;

the far end of the delivery pipe is connected with the near end of the dense net support, and the near end of the delivery pipe is connected to a delivery pipe joint; a tearable recovery sheath is arranged on the conveying pipe close to the joint of the conveying pipe;

the thrombus taking support or the grabbing device is arranged in the conveying pipe;

the dense net support is communicated with the conveying pipe, and after the thrombus taking support or the grabbing device catches the foreign bodies at the near end of the conveying pipe, the dense net support can completely catch the foreign bodies to be matched with the thrombus taking support or the grabbing device to complete extraction operation.

Compared with the prior art, the invention has the following beneficial effects:

1. the dense mesh stent adopted by the application is completely attached to the vessel wall, so that the probability of vascular embolism and complications thereof in the traditional thrombus taking technology is effectively reduced, thrombus can be completely removed, and no residue is left;

2. the problem that thrombus is cut by a stent and a catheter is solved;

3. according to the medical thrombus taking device, the thrombus taking catheter can be replaced by the medical apparatus grabber, and the displaced apparatus can be safely and quickly taken out and removed;

4. because the traditional thrombus removal operation has the problem of incomplete thrombus removal, the thrombus can be completely extracted by removing the thrombus for multiple times. The method solves the problems of long operation time and multiple operation times of the traditional embolectomy technology.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate 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 view of a vascular foreign body extraction device in accordance with one embodiment of the present invention;

FIG. 2 is a schematic view of a stent structure according to an embodiment of the present invention;

FIG. 3 is a schematic view of an assembled structure of a support and a delivery pipe according to an embodiment of the present invention;

FIG. 4 is a schematic view of a tearable recovery sheath according to one embodiment of the present invention;

FIG. 5 is a schematic illustration of a tearable retrieval sheath according to one embodiment of the present invention;

FIG. 6 is a schematic view of a tearable recovery sheath assembly according to one embodiment of the present invention;

FIG. 7 is a schematic view of a duct joint structure according to an embodiment of the present invention;

FIG. 8 is a second schematic view of a duct joint structure according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a simulated embolectomy according to an embodiment of the present invention;

FIG. 10 is a schematic view of a simulated grabbing risk instrument according to one embodiment of the present invention;

the device comprises a conveying pipe 1, a conveying pipe connector 2, a main body far end 2-1-1, a main body 2-1, a connecting buckle 2-2, a boss 2-2-1, a silica gel pad 2-3, a cavity channel 2-1-2, a connecting pipe 3, a two-way valve 4, a developing ring 5, a support 6, a dense mesh support far end 6-1, a dense mesh support near end 6-2, a dense mesh support far end port 6-1-1, a tearable recovery sheath 7, a thrombus taking catheter 8 and an intravascular catcher 9.

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.

In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" as used herein are intended to be broadly construed, and may include, for example, fixed connections and removable connections; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.

In the field of interventional medical devices, the end of a medical device implanted in a human or animal body closer to an operator is generally referred to as the "proximal end", the end farther from the operator is referred to as the "distal end", and the "proximal end" and the "distal end" of any component of the medical device are defined according to this principle. "axial" generally refers to the length of the medical device as it is being delivered, and "radial" generally refers to the direction of the medical device perpendicular to its "axial" direction, and defines both "axial" and "radial" directions of any component of the medical device in accordance with this principle.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

Thrombosis refers to a pathological process in which under certain conditions, the visible components in the circulating blood form emboli in blood vessels, which partially or completely blocks the blood vessels and obstructs blood supply at the corresponding parts. A thrombus is a blood clot formed in the vascular system of a living body which is affected by the absence of intravascular blood flow, and thus has structural characteristics different from those of a blood clot formed in a quiescent state outside the body. Thrombosis can be seen in the atrioventricular cavities, arteries, veins, and microvessels. Clinically, acute events caused by thrombosis include acute myocardial infarction, ischemic stroke, pulmonary embolism, disseminated intravascular coagulation and the like, and are often life threatening. The thrombosis is formed by that platelets are adhered to the exposed collagen surface after vascular endothelial injury, and the adhered platelets release adenosine diphosphate and thromboxane to promote more platelets to adhere and aggregate to form platelet thrombosis. The types of thrombi mainly include: white thrombus, red thrombus, cell plugs and clear plugs.

The treatment of thrombus mainly comprises anticoagulation treatment, thrombolysis treatment and interventional treatment at present. Patients with light early onset should be treated with anticoagulant drugs or thrombolytic drugs in time, and patients who have been treated with medical treatment and have poor effects or are seriously blocked by thrombus have better effect of operative intervention. The current surgical intervention mainly comprises catheter suction, stent embolectomy and combined use of the two. Aiming at peripheral vascular embolism, a peripheral thrombus taking support is often matched with a suction catheter for use, the size of the common thrombus taking support is larger than that of the suction catheter, so that when thrombus is pulled from the thrombus taking support to enter the suction catheter, part of the thrombus is cut from the thrombus taking support by the suction catheter, the thrombus is cut and rubbed off and falls off, the fallen thrombus can be flushed into a blood vessel at a far end by blood flow, secondary embolism is caused, and the life safety of a patient is threatened. Therefore, the invention provides a blood vessel foreign body extraction auxiliary device.

The distal end, the proximal end and the distal end are devices compatible with auxiliary stent embolectomy and risk recovery instruments, as shown in fig. 1, and comprise a delivery pipe 1, a delivery pipe joint 2, a connecting pipe 3, a two-way valve 4, a developing ring 5, a stent 6 and a tearable recovery sheath 7. The thrombus in the blood vessel and on the blood vessel wall can be effectively cleared away by matching the thrombus taking support with the device, and the phenomenon that secondary embolism occurs because part of thrombus is cut from the thrombus taking support by the suction catheter and is scraped and dropped is avoided. While also being compatible with commercially available catheter sheaths, endovascular clamps and other graspers, safely removing and removing instruments such as instrument dislodgement, emboli or improper implant function.

According to one embodiment of the invention, the vascular foreign body extraction auxiliary device is used for extracting a foreign body in a blood vessel, wherein the foreign body refers to pathological tissues in the blood vessel, surgical instruments or implants, such as thrombus, tumors, blood vessel stents, occluders, vein filters and the like. In one embodiment, the auxiliary device comprises a dense mesh stent, wherein the dense mesh stent has self-expansion property and is in an expanded state under the condition of not being subjected to external force, and in the self-expansion state, the dense mesh stent is a cover body structure with a far end opening and a near end contracting, wherein the contracting is relative to the opening end, and the contracting refers to the uniform contraction of the opening of the dense mesh stent towards an axis, namely the diameter of the far end opening of the dense mesh stent is larger than that of the near end opening; in one embodiment, the cover body can be a conical cover body, a truncated cone-shaped cover body, a cover body with a cylindrical distal end and a conical or truncated cone-shaped proximal end, or a cover body with a curved generatrix, and the cover body is suitable for the requirements that the distal end is attached to the inner wall of a blood vessel, the proximal end is contracted on the conveying pipe 1, and the function of blocking thrombus residues is realized is within the protection scope of the invention.

In an embodiment of the present invention, an arc-shaped transition section is disposed between the proximal end and the distal end of the dense mesh stent, the arc-shaped transition section is a part of the dense mesh stent, the arc-shaped transition section is not limited to an arc, and the arc may be a concave curve arc, an convex curve arc, a smooth arc, a wavy line arc, etc. in a cross-sectional state of the dense mesh stent along an axis, and a structure that facilitates the dense mesh to directly contract to the outer tube is within the protection scope of the present invention.

Preferably, as shown in fig. 2, in the self-expanded state, the dense mesh stent distal end 6-1 assumes a cylindrical state. The cylinder side can increase the laminating area with the vascular wall, can closely laminate the vascular wall to can not cause the damage to the vascular wall. The dense mesh stent distal end 6-1 can be made into different sizes according to the diameter of the conventional blood vessel and is suitable for different blood vessels. The diameter of the near end 6-2 of the dense mesh bracket is smaller than that of the far end 6-1 of the dense mesh bracket, a close-up which is connected with the far end 6-1 cylinder of the dense mesh bracket through a concave curve arc is formed, and the size of the close-up is matched with the diameter of the connecting pipe 1. The whole dense-net support 6 is of a similar gentle slope structure, and the contraction of the support is facilitated.

The dense mesh support 6 adopted by the application is a high-density dense mesh support formed by weaving and heat treatment sizing of metal nickel titanium wires, can be freely contracted and released, and cannot change in size and shape, and the far-end port 6-1-1 of the dense mesh support is of a closed structure, so that the phenomena of wire scattering and wire warping cannot occur in the process of recovering and releasing the dense mesh support 6.

Preferably, the dense mesh bracket 6 adopted by the application is a high-density dense mesh cover body, is woven by nickel titanium wires with the diameter of 0.08-0.12 mm, and is processed by heat treatment and shaping; the aperture of the meshes of the dense mesh bracket 6 is 0.1mm-0.5mm; the diameter range of the dense mesh scaffold is 3mm-50mm. Specifically, the maximum diameter of the expanded dense net support in the self-expansion state is 50mm; when the diameter of the pipe is acted by a radial external force, the diameter can be contracted to 3mm at least; thereby meeting the requirements of embolectomy operations and risk instrument recovery operations of different specifications.

The far end port 6-1-1 of the dense mesh support is of a closed structure, and particularly, an intersection point formed after the dense mesh is woven is a closed vertex.

The close net support 6 support that this application adopted can be formed by the manual work, include: weaving the metal nickel-titanium wires according to a customized die and a weaving method; the far-end port 6-1-1 of the dense mesh support woven by the method is directly of a closed structure and does not need any treatment;

or formed by knitting with a knitting machine, comprising: and (3) selecting a 24-72-head knitting machine for knitting, and performing laser welding on the far-end port 6-1-1 of the dense mesh support after knitting is finished, so that the thread head is firmly welded and is smoothly processed.

As shown in fig. 1, according to the embodiment of the present invention, the foreign matter extraction assisting device includes a delivery tube 1, a distal end of the delivery tube is connected to a proximal end of the dense mesh stent, and the delivery tube is a hollow flexible tube, and the material of the delivery tube is not limited.

In one embodiment, the close net support proximal end 6-2 surrounds the outer wall fixed at the far end of the delivery pipe, i.e. the close net support is connected with the outer wall at the far end of the delivery pipe; in one embodiment, the proximal face of the dense mesh stent is connected to the distal face of the delivery tube, i.e. the dense mesh stent is connected to the distal face of the delivery tube. In one embodiment, the connection can be a fixed connection or a movable connection, and preferably, the near end 6-2 of the dense mesh stent is connected to the far end of the delivery pipe 1 through a welding mode. Welding methods include, but are not limited to: and (4) performing hot melting welding. The welding joint surface is ensured to be smooth and flat and has enough connecting force, and the phenomena of falling and wire warping of the dense net support 6 can be avoided.

The far end of the conveying pipe is connected with the near end of the dense net support, and the conveying pipe is a hollow hose and is not limited by material. The inner diameter and the outer diameter of the conveying pipe 1 can be manufactured according to the operation requirement, and if the conveying pipe is used for matching with a thrombus removal support to remove thrombus, the inner diameter of the conveying pipe can be required to be a conduit for conveying the thrombus removal support; if the device is used for removing devices such as device displacement, embolism or improper function of the implant, the inner diameter of the delivery tube needs to pass through the corresponding intravascular catcher.

As shown in fig. 1 and 3, the vascular foreign object extraction assistance device according to the present application further includes: the developing ring 5 is a ring-shaped object and is coaxially arranged at the joint of the dense mesh support 6 and the conveying pipe 1, and the position of the dense mesh support 6 released can be accurately positioned in the operation process. The connection mode of the developing ring and the conveying pipe 1 is not limited, and the clamping connection mode, the welding mode and the like can be selected. The developing ring 5 is fixed on the outer wall of the conveying pipe 1, and the falling-off phenomenon caused by the movement of the conveying pipe 1 can be avoided.

As shown in fig. 1 and 4, the vascular foreign object extraction assistance device according to the present application further includes: the retrieval sheath 7 may be torn for retracting the stent 6 into the corresponding outer tube, sheath or catheter. The tearable recovery sheath 7 can be torn and thrown away or withdrawn for reuse after the dense mesh stent 6 enters the outer tube, the catheter sheath or the catheter.

In one embodiment of the present application, the tearable recovery sheath 7 is cylindrical and coaxially disposed outside the delivery tube 1, and can move along the delivery tube 1, and the tearable recovery sheath 7 has a diameter matching with the dense mesh stent, and can assist the stent 6 to enter the corresponding outer suction tube, sheath or catheter.

The proximal end of the tearable recovery sheath is provided with two axisymmetric notches, which is convenient for the tearing in the operation. The notch is a gap extending to the side wall along the edge of the bottom surface, and the side walls on two sides of the gap can be separated when external forces in opposite directions are applied to the side walls. The shape and the size of the notch are not limited so as to achieve the aim of tearing in the operation.

The notch may be a rectangular notch, a triangular notch, a circular-arc notch, or a notch exhibiting an irregular shape on its side, which is parallel or non-parallel to its axial direction.

The notch may also be a line segment present on its side, including straight, curved and spiral line segments (not shown).

In a preferred embodiment of the present application, a rectangular notch 7-1 is provided at the proximal end of the side of the retrieval sheath, parallel to its axis.

The size of the tearable recovery sheath 7 is adjusted according to the size of the delivery tube 1. The specification includes but is not limited to length and diameter size, and the length of the tearable recovery sheath 7 can be adjusted along with the length of the delivery pipe 1, so as to achieve the effect of convenient movement.

The minimum diameter of the tearable recovery sheath 7 needs to match the minimum diameter reached when the dense mesh stent is radially compressed, and when the tearable recovery sheath 7 is moved along the delivery tube 1 to the dense mesh stent, the dense mesh stent can be compressed into the tearable recovery sheath 7 along the radial direction thereof.

As shown in fig. 5, the tearable recovery sheath 7 assists the dense mesh stent 6 to enter the corresponding outer aspiration tube as follows: when the tearable recovery sheath 7 moves to the far end 6-1 of the dense mesh bracket, due to the self-expansion of the dense mesh bracket 6, when the dense mesh bracket 6 is subjected to a radial external force pointing to the axis caused by the movement of the tearable recovery sheath 7, the dense mesh bracket 6 can be completely contracted into the tearable recovery sheath 7, and the tearable recovery sheath 7 can completely wrap the dense mesh bracket 6.

At this point, the tearable recovery sheath 7 is implanted into the outer tube together with the dense mesh stent 6. When the net-sealing bracket 6 completely enters the outer tube, the tearable recovery sheath 7 can be torn off at the far end of the net-sealing bracket 6 directly through the tearing opening; if the situation that foreign matters in blood vessels are more occurs, for example, the situation that thrombus is more or risk instruments are difficult to recover is met, the foreign matters need to be extracted for many times, namely, the tearable recovery sheath 7 needs to be used for many times to place the dense mesh stent 6 into the outer tube. The tearable recovery sheath 7 can optionally be moved along the delivery tube 1 and withdrawn to the proximal end of the delivery tube 1 for reuse, when the foreign body has not been fully picked up.

As shown in fig. 6, when the device is installed, the tearable recovery sheath 7 is assembled on the delivery pipe 1 in advance before the delivery pipe 1 and the delivery pipe joint 2 are assembled, after the delivery pipe 1 and the delivery pipe joint 2 are assembled, the tearable recovery sheath 7 is positioned in front of the delivery pipe joint 2, and the notch 7-1 is close to the delivery pipe joint main body 2-1.

As shown in fig. 1 and 7, the vascular foreign object extraction assistance device according to the present application further includes: a delivery pipe joint 2.

The delivery pipe joint 2 that this application adopted still includes: the far end 2-1-1 of the main body, the main body 2 and the connecting buckle 2-2 are all hollow structures in order to put the extraction bracket into the conveying pipe 1, and the far end 2-1 of the main body, the main body 2 and the connecting buckle 2-2 are coaxially connected.

The body distal end 2-1-1 and the body 2 may be integrally connected; or may be a split connection.

The body distal end 2-1-1 is integrally connected to the body 2 as follows: the distal end 2-1-1 of the body is integrally formed with the body 2 and may be considered to be a unitary member.

In a preferred embodiment of the present application, the distal end 2-1-1 of the main body is designed to have a resilient structure, as shown in fig. 7. The body distal end 2-1-1 is connected with body 2 integral type, specifically: the side surface is a spiral line formed from the bottom surface to the cone top, and forms a shape similar to a spiral cone. The bottom surface of the helical cone is integrally formed with the distal end 2-1-1 of the body. The inner diameter of the conical top of the spiral cone is matched with the outer diameter of the conveying pipe 1, and the spiral cone is coaxially connected with the near end of the conveying pipe 1; the connection mode is not limited, and the clamping connection can be selected, and specifically comprises the following steps: a clamping groove is formed in the near end of the conveying pipe 1 and used for clamping the conical top of the spiral cone into the clamping groove to achieve the clamping effect; gluing can also be used, i.e. gluing the conical tip of the conical helix to the pipe 1, in order to achieve a cohesive connection.

The split type connection of the main body far end 2-1-1 and the main body 2 is as follows: the distal end 2-1-2 of the main body and the main body 2 are two independent members, and can be connected into a whole by clamping, welding, bonding and other connection modes.

The far end 2-1-1 of the main body can be replaced by the split type connection, the split type connection is not limited to the spiral cone, and the elastic structure is met or the elastic material is adopted, so that the connection toughness of the far end 2-1-1 of the main body and the conveying pipe 1 is increased, the stress concentration of the near end of the conveying pipe 1 can be reduced, and the conveying pipe 1 is protected to a certain extent. When the conveying pipe 1 is pushed into the body by external force, the phenomenon that the conveying pipe 1 is broken and the vessel wall is punctured due to the fact that the conveying pipe 1 is too long and is difficult to push into the body is avoided, and therefore medical accidents are caused.

The distal end 2-1-1 of the main body can adopt silica gel with soft resilience, and the shape can be selected from a spiral strip body, a structure similar to a spring body, a cone body structure or a cone body structure.

In one embodiment of the present application, the body 2-1 of the delivery fitting further comprises: the deformation pad is coaxial with the main body 2-1 and is arranged in the main body 2-1. The deformation pad can adopt a circular ring structure, the height of the deformation pad is matched with that of the main body 2-1, the deformation pad is made of elastic materials without water absorption, and when the deformation pad is subjected to axial external force, the deformation pad can deform along the axial direction.

As shown in fig. 8, in a preferred embodiment referred to in the present application, the deformation pad is a silicone pad 2-3. The outer diameter of the silica gel pad 2-3 is matched with the inner diameter of the circular cylinder, and the inner diameter of the silica gel pad 2-3 is matched with the outer diameter of the conveying pipe 1.

The far end of the deformation pad is also required to be provided with a limiting structure which is arranged inside the main body 2-1 and can limit the axial movement of the deformation pad inside the main body 2-1. In a preferred embodiment, the spacing structure may be a spacing washer. Specifically, an annular fixing piece is arranged on the radial section of the main body 2-1 and close to the far end of the silica gel pad 2-3, and the inner diameter of the fixing piece is consistent with the inner diameter of the deformation pad. The fixing piece is made of hard materials and is coaxially and fixedly arranged in the main body 2-1; can be clamped in the main body 2-1 or bonded in the main body 2-1 by gluing.

In a preferred embodiment, the stop structure may be a stop collar (not shown) having an inner diameter greater than the inner diameter of the deformable pad. The method specifically comprises the following steps: a notch is provided at the inner diameter of the main body 2-1 so that the retainer ring can be engaged in the notch. When the deformation pad moves towards the far end under the influence of external force, the limiting ring can abut against the edge of the far end of the deformation pad to prevent the deformation pad from further moving towards the far end.

In a preferred embodiment, the retention structure may be a protrusion (not shown) in the form of a protrusion. The method specifically comprises the following steps: 3-6 bulges are averagely arranged on the inner ring of one radial section of the main body 2-1 near the far end of the deformation pad, and can resist against the edge of the far end of the deformation pad to prevent the deformation pad from moving towards the far end.

As shown in figure 8, in the preferred embodiment of the present application, the connecting button 2-2 is a hollow ring body with a bottom, and the inner diameter of the connecting button is matched with the outer diameter of the circular cylinder; meanwhile, the bottom of the connecting buckle 2-2 is also provided with a hollow boss 2-2-1 which is coaxial with the main body 2-1 and can pass through the conveying pipe 1.

The connection mode of the connecting buckle 2-2 and the main body 2-1 is as follows:

one preferred embodiment is: the connecting buckle 2-2 is clamped with the main body 2-1 (not shown), specifically:

the inner ring of the connecting buckle 2-2 is provided with a bulge, and the side wall of the main body 2-1 is provided with a groove matched with the bulge.

Preferably, the groove may be a linear groove parallel to the axial direction. The inner ring of the connecting buckle 2-2 is provided with a bulge which is clamped in the groove so as to push the connecting buckle 2-2 to the far end of the main body 2-1 along the linear groove.

Preferably, the groove may be a spiral groove rotated along the side wall, and a protrusion provided on an inner ring of the coupling button 2-2 is engaged in the groove so as to spirally push the coupling button 2-2 toward the distal end of the body 2-1 along the spiral groove.

One preferred embodiment of the present application, as shown in fig. 8, is: the connector link and main part 2-1 threaded connection specifically do: the inner ring of the turnbuckle is provided with an inner thread, the side wall of the main body 2-1 is provided with an outer thread, and the inner thread is matched with the outer thread to be in threaded connection so as to push the rotary connecting buckle to the far end of the main body 2-1.

When the connecting buckle is pushed towards the far end of the main body 2-1, the boss 2-2-1 can extrude the deformation pad so as to block the cavity 2-1-2 of the main body, and the hemostatic effect is achieved.

The present application also relates to a foreign body extraction device comprising an auxiliary device, which comprises a vascular foreign body extraction auxiliary device as described above, and a thrombectomy support or grasping device, which may be: an intravascular trap. The dense net support 6 is in through connection with the conveying pipe 1, when the thrombus taking support or the grabbing device catches foreign matters at the near end of the conveying pipe, the dense net support 6 can completely cover the foreign matters, and the extraction operation is completed by matching with the thrombus taking support or the grabbing device 1.

Application scenario 1:

as shown in fig. 9, when the device is used for removing thrombus in blood vessels and on blood vessel walls in conjunction with a thrombus removal stent, first, when the device reaches the vicinity of the position of thrombus by passing through the aspiration outer tube in advance, the dense mesh stent is extended out of the aspiration outer tube, and due to its self-expansion property, the stent will immediately release the tension and expand into a shape similar to a cover body in both the axial direction and the radial direction. The dense net support 6 can be tightly attached to the vascular wall, the thrombus taking catheter 8 penetrates through the delivery pipe 1 to reach the thrombus position, then the thrombus taking support is released, after the thrombus is captured by the thrombus taking support and is completely brought into the far end 6-1 of the dense net support, the delivery pipe 1 and the thrombus taking support device are pulled to enter the suction outer pipe, and all instruments are withdrawn from the human body after the thrombus taking is completed.

Application scenario 2:

as shown in figure 10, when the device is used to match an intravascular trap to extract and remove instruments such as instrument displacement, emboli or implant dysfunction during surgery, the dense mesh stent extends out of the aspiration outer tube when the device is first advanced through the catheter sheath to the vicinity of the risky instrument, and due to its self-expandable nature, will immediately release tension, expanding axially and radially to a shape similar to a shield. The dense net support 6 can be tightly attached to the vascular wall, then the intravascular catcher 9 penetrates through the conveying pipe 1 to reach the position of a risk apparatus to be grabbed, after the risk apparatus is grabbed by the grabber and enters the far end 6-1 of the dense net support, the conveying pipe 1 and the grabber device are pulled to enter the catheter sheath, and after grabbing is completed, all the apparatus are withdrawn from the human body.

The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the invention is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A vascular foreign body extraction assisting device, characterized in that the device comprises,

the dense mesh support is in a cover body structure with an opening at the far end and a contraction at the near end in a self-expansion state, and an arc-shaped transition section is arranged between the far end and the near end of the dense mesh support so as to facilitate the dense mesh support to be contracted into the outer pipe;

the far end of the conveying pipe is connected with the near end of the dense mesh bracket, and the near end of the conveying pipe is connected to a conveying pipe joint; a tearable recovery sheath is arranged on the conveying pipe close to the joint of the conveying pipe;

the dense net support and the conveying pipe are in through connection to be matched with the foreign matter extraction support to finish extraction operation.

2. The vascular foreign object extraction aid of claim 1, wherein an outer diameter of the delivery tube is smaller than an inner diameter of the outer tube, so that the dense mesh stent is released after the outer tube delivers the delivery tube to a designated location.

3. The vascular foreign body extraction assisting device according to claim 1, wherein the dense mesh stent is a high-density dense mesh cover body, is woven by nickel titanium wires with the diameter of 0.08mm to 0.12mm, and is processed by heat treatment and shaping; the aperture of the meshes of the dense net support is 0.1mm-0.5mm; the diameter of the dense net support is 3mm-50mm.

4. The vascular foreign body extraction aid according to claim 1,

the distal end of dense net support is the cylinder, and the maximum diameter after the support expandes matches with the vascular wall diameter, the cylinder outer wall can closely laminate the blood vessel inner wall.

5. The vascular foreign body extraction aid according to claim 1,

the port at the far end of the dense net support is of a closed structure.

6. The vascular foreign body extraction aid of claim 1, further comprising: the developing ring is an annular object and is coaxially arranged at the joint of the bracket and the conveying pipe.

7. The vascular foreign object extraction aid of claim 1, wherein the tearable recovery sheath is cylindrical and coaxially disposed outside the delivery tube, and is movable along the delivery tube;

one end of the tearable recovery sheath is provided with a notch.

8. The vascular foreign object extraction assist device of claim 1, wherein the delivery tube connector comprises:

the main body far end, the main body and the connecting buckle are coaxially and sequentially connected;

the far end of the main body, the main body and the connecting buckle are all hollow structures so as to put the foreign body extraction bracket into the conveying pipe.

9. The vascular foreign object extraction aid of claim 8, wherein the delivery tube adaptor further comprises:

a deformation pad matching an inner diameter of the body and disposed within the body; the inner diameter of the main body is also provided with a limiting structure for limiting the deformation pad;

the connecting buckle is an annular body with a bottom, and the inner diameter of the connecting buckle is matched with the outer diameter of the main body; the bottom of the connecting buckle is provided with a boss which is coaxial with the main body;

the connecting buckle is movably connected with the main body so as to extrude the boss to the deformation pad.

10. A foreign matter extraction apparatus including an auxiliary device, characterized in that the apparatus includes,

the dense mesh support is in a cover body structure with an opening at the far end and a contraction at the near end in a self-expansion state, and an arc-shaped transition section is arranged between the far end and the near end of the dense mesh support so as to facilitate the dense mesh support to be contracted into the outer pipe;

the far end of the delivery pipe is connected with the near end of the dense net support, and the near end of the delivery pipe is connected to a delivery pipe joint; a tearable recovery sheath is arranged on the conveying pipe close to the joint of the conveying pipe;

the thrombus taking support or the grabbing device is arranged in the conveying pipe;

the dense net support is communicated with the conveying pipe, and after the thrombus taking support or the grabbing device catches the foreign bodies at the near end of the conveying pipe, the dense net support can completely catch the foreign bodies to be matched with the thrombus taking support or the grabbing device to complete extraction operation.

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