CN218247309U

CN218247309U - But distal end reducing suction device and system

Info

Publication number: CN218247309U
Application number: CN202121544184.XU
Authority: CN
Inventors: 请求不公布姓名; 李�真; 邢雷; 戴威骏
Original assignee: Changzhou Kainit Medical Technology Co ltd
Current assignee: Changzhou Kainit Medical Technology Co ltd
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2023-01-10
Anticipated expiration: 2031-07-08

Abstract

The utility model relates to a but distal end reducing suction device and system, suction device includes: an outer tube, an inner tube, and an expansion element; the inner tube is slidably arranged in the outer tube; the expansion element is of a hollow structure and can contract or expand radially, and the proximal end of the expansion element is fixedly connected with the distal end of the inner tube. When the device is used, the device can be directly guided into a blood vessel, the outer tube is withdrawn through operation, the self-expanding stent accommodated in the outer tube is exposed and expanded, the blood flow is slowed down to a far end to a great extent, and the risk of thrombus fragmentation is reduced by locally limiting the blood flow; meanwhile, the inner tube can also perform suction on thrombus in the blood vessel.

Description

But distal end reducing suction device and system

Technical Field

The utility model relates to a intervene art and use medical instrument technical field, especially relate to a but distal end reducing suction device and system.

Background

In the medical field, blood vessels are often blocked due to thrombus in the blood vessels of a human body, and if the blood vessels are not treated in time, local tissues are easy to form tissue necrosis due to ischemia, so that serious sequelae are caused to influence the health of the human body, and even the life of the human body is threatened.

In order to solve the problem that the existing thrombus blocks the blood vessel, the methods solved in the prior art include drug thrombolysis and mechanical thrombus removal, which are specifically as follows:

the drug thrombolysis has two types, one is to inject the thrombolysis agent into the vein vessel directly, namely vein thrombolysis, the other is to inject the thrombolysis agent into the thrombus position in the vessel through an over-selected catheter, and high thrombolysis agent concentration is formed at the thrombus position instantly, so that the dissolving speed of the thrombus is accelerated, namely artery thrombolysis; however, the drug thrombolysis is only suitable for small fresh thrombus which is just formed, has poor effect on occlusive thrombus with larger volume, and has no effect on intravascular embolism caused by the shedding of old thrombus which is formed for a longer time.

Mechanical thrombus removal is to convey a thrombus remover to a thrombus position and then further remove the thrombus from a blood vessel, and comprises thrombectomy, laser thrombus crushing, catcher thrombus removal, thrombus capture net thrombus removal and the like. The method is thorough in thrombus removal, but has overlarge damage to the vascular wall, and is easy to cause various complications; the laser thrombus breaking has high operation difficulty, is ineffective when the laser energy is too low, damages blood vessels when the energy is too high, and is easy to cause various complications; the catcher is used for taking thrombus, the operation is simple, the injury to the blood vessel wall is small, but blood clots can not be sleeved frequently; the thrombus catching net is simple to operate for thrombus extraction, but cannot reach tortuous or tiny blood vessels due to large volume, so that the thrombus catching net cannot be used in intracranial blood vessels, and is not beneficial to thrombus extraction.

Since the diameter of the blood vessel is limited, the diameter of the thrombus extractor for sucking thrombus is also limited, and therefore, the thrombus sucking effect is not ideal.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a but distal end reducing suction device and system aims at solving the technical problem who exists among the prior art.

The utility model adopts the following technical proposal:

a distal variable diameter suction device comprising: an outer tube, an inner tube, and an expansion element; the inner tube is slidably arranged in the outer tube; the expansion element is of a hollow structure and can contract or expand radially, and the proximal end of the expansion element is fixedly connected with the distal end of the inner tube.

Preferably, the fixing connection means includes crimping, attaching or integrally weaving with the inner tube.

Preferably, the proximal end of the expansion element is attached to the distal end of the inner tube in a sealing manner.

Preferably, the proximal end of the expansion element is connected to the inner layer of the inner tube by crimping.

Preferably, the expansion element is a self-expanding stent, and can be radially contracted and accommodated in the outer tube; and the proximal end of the self-expanding stent has a through hole.

Preferably, the maximum outer diameter of the self-expanding stent is larger than the inner diameter of the outer tube and is close to the inner diameter of the target blood vessel.

As a preferred technical solution, the self-expanding stent comprises an expanding section and a supporting section; the expanding section is approximately conical, and the supporting section is approximately cylindrical; and the small diameter end of the conical structure of the expansion section is connected with the inner pipe.

As a preferred technical scheme, the self-expanding stent is a laser-cut metal stent;

or the self-expanding stent is a metal woven mesh tube formed by spirally winding and weaving a plurality of metal wires;

or the self-expanding stent is a metal woven mesh tube woven by a plurality of metal wires.

Preferably, the material of the self-expanding stent is memory metal.

Preferably, the outer surface of the self-expanding stent is covered with a covering film.

As a preferred technical scheme, the inner tube can pass through a microcatheter, a thrombus removal stent or a saccule all the way.

The utility model also provides a but distal end reducing suction system, including as above arbitrary suction device, still include the gripping device who link up along the axial, but the variable footpath suction device of distal end alternates in gripping device's the way that link up.

As a preferred technical scheme, a first adjusting push rod and a second adjusting push rod are respectively arranged at the near ends of the outer tube and the inner tube, and are respectively and vertically arranged at the near ends of the outer tube and the inner tube; the outer side wall of the holding device is provided with two sliding grooves which are longitudinally arranged, each sliding groove comprises a first sliding groove and a second sliding groove, and the first adjusting push rod and the second adjusting push rod are respectively embedded into the first sliding groove and the second sliding groove and can longitudinally slide in the first sliding groove and the second sliding groove.

As a preferable technical scheme, a luer connector is further arranged at the proximal end of the holding device and fixedly connected to the proximal end of the inner tube.

Luer connects and is connected with negative pressure device for guarantee the utility model discloses a suction effect.

The utility model discloses a technical scheme can reach following beneficial effect: the utility model discloses a but distal end reducing suction device is coaxial structure, include the sheath pipe that forms by inner tube and outer tube nestification each other, especially the one end of inner tube is connected with hollow self-expanding support, accepts before the use for use in the outer tube. When the self-expanding stent is used, the sheath tube is directly led into a blood vessel, the outer tube is withdrawn through operation, the self-expanding stent accommodated in the outer tube is exposed and expanded, the blood flow is slowed down to a far end to a great extent, and the thrombus fragmentation risk is reduced by locally limiting the blood flow; the thrombus can be removed through the micro-catheter, the thrombus removal support or the saccule in the inner tube in the whole process, the inner tube is retracted into the outer tube through operation after the thrombus removal is finished, and then the whole device is withdrawn. Meanwhile, the inner tube can suck thrombus in the blood vessel. Additionally, the utility model also provides a but distal end reducing suction system still is provided with the gripping device in original suction device's outside, and suction device's inner tube and outer tube are connected with adjusting push rod and embedding gripping device lateral wall respectively to the removal of convenient to use person operation inner tube and outer tube.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof of the present invention explain the present invention and do not form an improper limitation to the present invention. In the drawings:

fig. 1 is a schematic structural view of a distal end variable diameter suction device disclosed in embodiment 1 of the present invention;

fig. 2 is a schematic plan view of a distal end variable diameter suction device disclosed in embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a distal variable diameter suction device disclosed in a preferred embodiment of example 1 of the present invention;

fig. 4 is a cross-sectional view of a self-expanding stent disclosed in a preferred embodiment of example 1 of the present invention;

fig. 5 is a schematic structural diagram of a distal end variable diameter suction system disclosed in embodiment 2 of the present invention;

fig. 6 is a top view of the distal end variable diameter suction system disclosed in embodiment 2 of the present invention;

fig. 7 is a schematic plan view of a distal end variable diameter suction system disclosed in embodiment 2 of the present invention in an initial state;

fig. 8 is a schematic plan view of the distal end variable diameter suction system disclosed in embodiment 2 of the present invention in an operating state;

fig. 9 is a schematic plan view of the distal end variable diameter suction system disclosed in embodiment 2 of the present invention in a retracted state after the end of operation;

fig. 10 is a schematic structural diagram of a distal end variable diameter suction system disclosed in embodiment 3 of the present invention.

Description of the reference numerals:

a sheath tube 10, an inner tube 11, an outer tube 12, a self-expanding stent 13, an expanding section 131, and a supporting section 132;

the device comprises a holding device 20, a through passage 21, a first adjusting push rod 22, a second adjusting push rod 23, a first sliding groove 24, a second sliding groove 25, an anti-skid groove 26 and a guide element 27;

a microcatheter 30;

a luer fitting 40.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following description will be given with reference to the embodiments of the present invention and the accompanying drawings, in which the technical solution of the present invention is clearly and completely described. In the description of the present invention, it is noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.

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.

It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. 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 order to solve the problems existing in the prior art, the embodiment of the present application provides a suction device with a variable diameter at the distal end, which includes: an outer tube; an inner tube slidably disposed within the outer tube; a self-expanding stent capable of radially contracting and housed within the outer tube; the near end of the self-expanding stent is fixedly connected with the far end of the inner tube, and the near end of the self-expanding stent is provided with a through hole.

Example 1

This example 1 provides a distal variable diameter suction device to solve the problems in the prior art. According to fig. 1-2, the distal variable diameter suction device comprises a sheath 10 formed by an inner tube 11 and an outer tube 12 nested into each other, both of which are flexible catheters. Since the inner diameters of blood vessels are not the same for different patients or different diseased portions of the same patient, it can be understood by those skilled in the art that the size and specification of the sheath 10 can be changed adaptively according to the condition of the patient.

A hollow self-expanding stent 13 is fixed to one end of the inner tube 11, and the self-expanding stent 13 has the ability to radially contract and expand to be received in the outer tube 12 or to expand a blood vessel in compliance when it is expanded.

In one embodiment, the proximal end of the self-expanding stent 13 is attached to the distal end of the inner tube 11 in a sealed manner, with a smooth transition at the junction.

In another embodiment, the proximal end of the self-expanding stent 13 is crimped directly to the inner layer of the inner tube 11 with a smooth transition at the junction.

In another embodiment, the inner tube 11 has a multi-layered structure, the intermediate layer is braided with wires, optionally 16, 18, 24, 48 and 64 strands, preferably 48 strands, integrally braided from the proximal end of the inner tube 11 to the distal end of the self-expanding stent 13.

Preferably, according to fig. 2, the self-expanding stent 13 comprises an expanding section 131 and a supporting section 132; the expanding section 131 is substantially conical, which is beneficial to the self-expanding stent 13 to slide out of the outer tube 12 or be accommodated in the outer tube 12 more smoothly when the inner tube 11 and the outer tube 12 move relatively; the supporting section 132 is approximately cylindrical, can be better matched with the shape of the inner wall of the blood vessel, and can stably support the blood vessel wall; it will be understood by those skilled in the art that "conical" and "cylindrical" refer to a general shape only, not an absolute shape, and that the junction of the expanding section 131 and the bracing section 132 should be smooth.

Preferably, the maximum outer diameter of the self-expanding stent 13 is larger than the inner diameter of the outer tube 12 to expand the blood vessel to a greater extent and restrict the flow rate of blood; wherein, the outer diameter of the inner tube is preferably 6-7F, the outer diameter of the outer tube is preferably 8-9F, and the maximum outer diameter of the self-expanding stent 13 is 4-6mm so as to be matched with the inner diameter of the C1 section of the internal carotid artery. The small diameter end of the conical structure of the expanding section 131 is fixedly connected with the inner tube 11, and the outer diameter of the small diameter end is matched with the outer diameter of the inner tube 11.

In one embodiment, the self-expanding stent 13 is a mesh tube woven from metal. Preferably, the metal woven mesh tube is made of memory metal, and a bare wire weaving process is adopted, and specifically, the metal woven mesh tube may be formed by spirally winding and weaving a plurality of metal wires or directly weaving the metal wires, so as to ensure that the self-expanding stent 13 can generate radial elastic deformation, and is accommodated in the outer tube 12 or exposed outside the outer tube 12 according to the needs of an operator.

Preferably, the braiding density of the metal mesh tube constituting the self-expanding stent 13 at the expansion section 131 is greater than that of the support section 132, and the braiding density of the expansion section 131 increases gradually and tends to be stable from the small-diameter end to the large-diameter end, so as to facilitate the contraction and expansion of the self-expanding stent 13.

In another embodiment, the self-expandable stent 13 is a laser-cut metal stent and is made of a memory metal material, and likewise, the memory metal material can ensure that the self-expandable stent 13 can generate radial elastic deformation so as to be accommodated in the outer tube 12 or exposed outside the outer tube 12 according to the needs of an operator.

In both embodiments, when the weaving density or the laser cutting density of the self-expanding stent 13 is low, the outer surface thereof is further coated with a coating film.

According to fig. 1 and 2, the length of the outer tube 12 is smaller than that of the inner tube 11, so that an operator can conveniently move the outer tube 12 and the inner tube 11 in an axial direction to store the self-expanding stent 13 in the inner or expose the self-expanding stent to the outside

Preferably, the inner diameter of the inner tube 11 satisfies: can be passed through the microcatheter 30, thrombectomy stent or balloon throughout. After the self-expanding stent 13 is expanded, the micro-catheter 30, the thrombus removal stent or the saccule can be guided into the inner tube 11 for thrombus removal operation. In a preferred embodiment, as shown in fig. 3 and 4, the inner tube 11 is passed into the microcatheter 30 after the self-expanding stent 13 is expanded.

In this embodiment, the specific application method of the present invention is as follows:

before use, the self-expanding stent 13 at one end of the inner tube 11 is contracted into the outer tube 12 for standby, the sheath tube 10 is directly guided into the blood vessel when in use, and an operator fixes the position of the inner tube 11 and withdraws the outer tube 12, so that the self-expanding stent 13 accommodated in the outer tube 12 is exposed and expanded, the blood flow is slowed down to a far end to a great extent, and the risk of thrombus fragmentation is reduced by locally limiting the blood flow; introducing the micro-catheter 30, the thrombus removal support or the saccule into the inner tube 11 to perform thrombus removal operation according to the requirement; the intravascular thrombus can be aspirated through the inner tube as needed. After the removal of the plug is completed, the inner tube 11 is withdrawn into the outer tube 12 by operation, and then the whole device is withdrawn.

Example 2

As shown in fig. 5 and 6, in this embodiment, on the basis of the structure of embodiment 1, a holding device 20 is further disposed outside the sheath 10, and the holding device 20 is in a handle shape, so that an operator can fix and move the sheath 10 conveniently. The holding device 20 is axially through, the sheath tube 10 is inserted into the through passage 21 of the holding device 20, and the distal end of the sheath tube extends out, and the proximal end of the sheath tube is located in the through passage 21.

Preferably, as shown in fig. 5, the length of the outer tube 12 of the sheath tube 10 in the holding device 20 is smaller than the length of the inner tube 11 in the holding device 20, and an adjusting push rod is vertically arranged at the proximal ends of the outer tube 12 and the inner tube 11, as shown in fig. 6, and comprises a first adjusting push rod 22 and a second adjusting push rod 23; two sliding grooves which are longitudinally arranged are arranged on the outer side wall of the holding device 20, and comprise a first sliding groove 24 and a second sliding groove 25, and a first adjusting push rod 22 and a second adjusting push rod 23 are respectively embedded into the first sliding groove 24 and the second sliding groove 25 and can longitudinally slide in the first sliding groove and the second sliding groove, so that an operator can conveniently control the inner tube 11 and the outer tube 12 to move relatively along the axial direction by directly pushing the adjusting push rods, and control the contraction and expansion of the self-expanding bracket 13.

Preferably, as shown in fig. 6, a plurality of anti-slip grooves 26 are further provided on the outer sidewall of the grip device 20 to prevent a user from accidentally slipping off during the operation.

Preferably, the holding device 20 is further provided with a tubular guiding element 27 at the end of the sheath 10, through which the sheath 10 is passed, so as to facilitate the introduction of the flexible sheath 10 into the blood vessel and position the sheath 10 to prevent the sheath from slipping.

The specific features of the inner tube 11, the outer tube 12 and the self-expandable stent 13 in this embodiment are described in embodiment 1, and are not described herein again.

as shown in fig. 7, in the initial state, the self-expandable stent 13 at one end of the inner tube 11 is contracted into the outer tube 12 for use; as shown in fig. 8, in an operating state, an operator holds the holding device 20 to introduce the sheath 10 into the blood vessel, and first pushes the first adjusting push rod 22 backwards according to the arrow in fig. 8 to control the outer tube 12 to retract, so that the self-expanding stent 13 accommodated in the outer tube 12 is exposed and expanded, thereby greatly slowing down the blood flow flowing to the distal end and reducing the risk of thrombus fragmentation by locally restricting the blood flow; introducing the micro-catheter 30, the thrombus removal support or the saccule into the inner tube 11 to perform thrombus removal operation according to the requirement; after the operation is finished, the second adjusting push rod 23 is pushed backward in the direction of the arrow in the figure to operate the self-expanding stent 13 and the inner tube 11 to be withdrawn into the outer tube 12, and then the whole device is withdrawn, as shown in fig. 9.

Example 3

As shown in fig. 10, this embodiment provides a distal end variable diameter aspiration system, and in addition to the structure of embodiment 2, a luer connector 40 is further provided at the proximal end of the holding device 20, and the luer connector 40 is connected to the proximal end of the inner tube 11.

In a preferred embodiment, a negative pressure device is connected to the proximal end of the luer connector 40, and the negative pressure device can be used for manually sucking by a syringe or sucking the intravascular thrombus by using negative pressure generated by a mechanical device.

In another preferred embodiment, a drug injection device is attached to the proximal end of luer fitting 40. Such as for injecting thrombolytic drugs, contrast agents, anticoagulant drugs or physiological saline into blood vessels.

Example 4

In a medical scenario, patients have different ages, sexes, heights, weights, lesion locations, lesion conditions, etc., and thus blood vessels that are confronted with a need for an embolectomy procedure may also have different inner diameters or shapes.

The embodiment provides a suction system with a variable-diameter distal end, which comprises a sheath tube 10 formed by mutually nesting an inner tube 11 and an outer tube 12, wherein the distal end of the inner tube 11 is fixedly connected with a self-expanding bracket 13, and a holding device 20 is further arranged outside the sheath tube 10. Preferably, in the present embodiment, a plurality of inner tubes 11 and outer tubes 12 with different specifications are provided, wherein the outer diameter of the inner tube 11 can be 5F, 6F, and can pass through a micro-catheter, a thrombectomy stent and a balloon. The outer diameter of the outer tube 12 can be 8F, 9F, which is equivalent to the function of a guiding catheter.

Accordingly, the outer diameter of the expanded section 131 of the self-expanding stent 13 at the small diameter end is kept the same as the outer diameter of the inner tube 11, i.e., when the inner tube 11 having a large outer diameter is selected, the size of the self-expanding stent 13 should be increased correspondingly; when the inner tube 11 having a small outer diameter is selected, the size of the self-expanding stent 13 should be reduced more than necessary.

The specific features of the inner tube 11, the outer tube 12, the self-expandable stent 13 and the holding device 20 in this embodiment are described in embodiments 1 to 3, and are not repeated herein.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.

Claims

1. A distal variable diameter aspiration device, comprising: an outer tube, an inner tube, and an expansion element; the inner tube is slidably arranged in the outer tube; the expansion element is of a hollow structure and can contract or expand radially, and the proximal end of the expansion element is fixedly connected with the distal end of the inner tube.

2. The distal variable diameter suction device according to claim 1, wherein the fixed connection means comprises crimping, attaching, or integrally braiding with the inner tube.

3. The distal variable diameter suction device according to claim 2, wherein the proximal end of the expansion element is attached to the distal end of the inner tube in a sealing manner.

4. The distal variable diameter suction device according to claim 2, wherein the proximal end of the expansion element is connected to the inner layer of the inner tube by crimping.

5. The distal variable diameter suction device according to claim 1, wherein the expansion element is a self-expanding stent capable of radially contracting and being received within the outer tube; and the proximal end of the self-expanding stent has a through hole.

6. The distal variable diameter suction device according to claim 5, wherein the maximum outer diameter of the self-expanding stent is larger than the inner diameter of the outer tube and close to the inner diameter of the target vessel.

7. The distal variable diameter suction device according to claim 6, wherein the self-expanding stent comprises an expanding section and a supporting section; the expanding section is approximately conical, and the supporting section is approximately cylindrical; and the small diameter end of the conical structure of the expansion section is connected with the inner pipe.

8. The distal variable diameter suction device according to any one of claims 5 to 7, wherein the self-expanding stent is a laser-cut metal stent;

9. The distal variable diameter suction device according to claim 8, wherein the self-expanding stent is made of a memory metal.

10. A distal variable-diameter suction system, comprising the suction device according to any one of claims 1 to 9, and further comprising a holding device extending axially therethrough, wherein the distal variable-diameter suction device is inserted into the through passage of the holding device.

11. The distal end variable-diameter suction system according to claim 10, wherein a first adjusting push rod and a second adjusting push rod are respectively arranged at the proximal ends of the outer tube and the inner tube, and are respectively vertically arranged at the proximal ends of the outer tube and the inner tube; the outer side wall of the holding device is provided with two sliding grooves which are longitudinally arranged, each sliding groove comprises a first sliding groove and a second sliding groove, and the first adjusting push rod and the second adjusting push rod are respectively embedded into the first sliding groove and the second sliding groove and can longitudinally slide in the first sliding groove and the second sliding groove.