CN218792404U - Expandable net frame type mechanical thrombus removal catheter device - Google Patents

Abstract

The invention discloses an expandable net rack type mechanical thrombus removal catheter device, and belongs to the technical field of thrombus removal instruments. The spiral rotor assembly is characterized by comprising an expandable net rack assembly, a spiral rotor assembly, a suction catheter and a conveying catheter, wherein the near end of the spiral rotor assembly is connected to a drive control handle for driving the spiral rotor assembly to rotate, the far end of the spiral rotor assembly is arranged in the expandable net rack assembly, the suction catheter is arranged in the inner cavity of the conveying catheter, a rotary cutting component is arranged at the far end of a spiral rotor, the expandable net rack assembly comprises a guide cap, a telescopic pipe, a connecting pipe and an expansion component, and the far end of the expansion component is connected with the guide cap. Through providing an expandable net rack formula machinery thrombus excision catheter device, expandable net rack subassembly can limit high-speed rotary-cut part in the expanding element, stirs and smashes the interior thrombus of expanding element, and it is external to transport out through the spiral rotor spiral that the suction catheter inhales, improves thrombus and clears away efficiency, prevents high-speed rotary-cut part damage vascular wall simultaneously.

Description

Expandable net frame type mechanical thrombus removal catheter device

Technical Field

The invention relates to an expandable net rack type mechanical thrombus removal catheter device, and belongs to the technical field of thrombus removal instruments.

Background

Abnormal blood flow in human blood vessels, such as blood turbulence, slow flow rate and the like, may cause impurities in the blood to deposit and form thrombus, which may cause blood vessel blockage or stenosis, thereby causing a series of problems such as reduced blood flow in the downstream region of the vascular lesion, tissue hypoxia, increased blood pressure, increased heart load and the like. When the lesion part is positioned in the neurovascular system, diseases such as cerebral apoplexy and the like can be caused; when the lesion part is positioned in the deep venous vascular system of the lower limb, swelling and varicosity of the lower limb can be caused, and paralysis can even be caused when the lesion part is serious; when the lesion is located in the pulmonary vascular system, pulmonary embolism and other diseases may be caused.

Thrombus in blood vessels generally needs to be removed through a blood vessel intervention technology, so that blockage or stenosis in the blood vessels is eliminated, and blood flow is recovered. In recent years, a mechanical thrombus removal technology has been rapidly developed, and the mechanical thrombus removal technology is mainly used for removing thrombus, plaque and other obstructions in a blood vessel in a hydrodynamic manner, a high-speed rotation manner and other manners so as to achieve the purposes of dredging the blood vessel and reconstructing a blood transportation system.

The conventional mechanical thrombectomy device, such as the one described in patent US7905896B2, which uses a rotary power cutting assembly to remove thrombi, has two risks: the first one is that the catheter is bent when passing through a bent human blood vessel, the front end rotating or sucking part is attached to the blood vessel wall under the restriction of the blood vessel, and inevitably rubs and scratches the blood vessel wall in the thrombus removing process to cause injury of the inner wall of the blood vessel, even cause perforation bleeding of the blood vessel under severe conditions, and particularly in the vein thrombus removing process, the rotating or sucking part is easy to touch a vein valve, so that the vein valve is likely to fail, and a series of complications are brought; secondly, in the process of removing thrombus, large thrombus or plaque and other obstructions are easy to dissociate into a downstream system of the blood vessel under the action of blood flow force, so that corresponding complications are caused.

Therefore, the rotating or suction component at the front end of the vascular intervention device is positioned at the center of the blood vessel as far as possible in the thrombus removal process, keeps a certain distance from the inner wall of the blood vessel and the venous valve, and also prevents thrombus from breaking and escaping to cause thrombus remote embolism, such as serious lethal diseases of pulmonary embolism and the like.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provides an expandable net rack type mechanical thrombectomy catheter device, which solves the problems of low clearing efficiency, vascular wall and venous valve damage, thrombus distal embolism and other complications when mechanical thrombectomy is performed.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

an expandable net rack mechanical thrombectomy catheter device, comprising an expandable net rack assembly, a helical rotor assembly, an aspiration catheter and a delivery catheter, wherein the proximal end of the helical rotor assembly is connected to a driving control handle, the distal end of the helical rotor assembly is arranged in the expandable net rack assembly, and the aspiration catheter is arranged in the delivery catheter;

the spiral rotor assembly comprises a rotary cutting component and a spiral rotor, and the rotary cutting component is arranged at the far end of the spiral rotor;

the expandable net rack assembly comprises a guide cap, a telescopic pipe, a connecting pipe and an expansion part, wherein the far end of the expansion part is connected with the guide cap, the near end of the expansion part is connected with the suction catheter through the connecting pipe, the near end of the telescopic pipe is inserted into the spiral rotor assembly, and the far end of the telescopic pipe is connected with the guide cap.

As a preferred example, the expansion member includes a support wire, both ends of which are provided with cylindrical ends, and a connection pipe fixedly connected to the cylindrical ends.

As a preferred example, the expansion member comprises one or more support wires.

As a preferred example, the support wires include flat arc support wires and wave arc support wires.

As a preferred example, the end shape of the telescopic tube includes a cone shape and a circular shape.

As a preferred example, the expanding member includes a cut cross-shaped expanding member, a cut spiral-shaped expanding member, a braided cross-shaped expanding member, and a braided spiral-shaped expanding member.

As a preferred example, the rotary cutting member includes a strip type rotary cutting member and a strip protrusion type rotary cutting member.

As a preferable example, the rotary cutting member is provided with notches, and the notches include a straight notch, a cage notch and a half notch.

As a preferred example, the rotary cutting member is provided with projections including an impeller-type projection, a helical impeller-type projection, a ring-type projection, a tooth-type projection, and a screw-type projection.

As a preferable example, the strip-type rotary cutting member is provided with a notch, and the shape of the notch includes a semicircular shape and a square shape.

The invention has the beneficial effects that:

1. the expandable net rack assembly places the rotary cutting component in the expansion component, so that the rotary cutting component which rotates at a high speed drives liquid in a blood vessel to rotate at a high speed, stirs and breaks thrombus in the expansion component, a suction catheter can suck the broken thrombus and transport the broken thrombus out of the body conveniently, thrombus removal efficiency is improved, and the expandable net rack assembly can limit the high-speed rotary cutting component in the expansion component and prevent the high-speed rotary cutting component from rubbing the blood vessel wall.

2. An expandable mesh frame assembly is attached to the distal end of the aspiration catheter to confine the thrombus within the expandable member during withdrawal and prevent the bulk of the thrombus from flowing into the downstream vascular system.

3. The telescopic pipe is inserted in the spiral rotor, on one hand, plays a guiding role for the guide wire, and on the other hand, provides an axial space for the expansion of the expansion part.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic cross-sectional view of an expandable rack assembly and a helical rotor assembly;

FIG. 3 is a schematic view of the proximal barrel section and the attachment of the connector tube;

FIG. 4 is a schematic structural view of an expandable rack assembly and a helical rotor assembly;

FIG. 5 is a schematic structural view of a flat curved support wire;

FIG. 6 is a schematic structural view of a helical rotor assembly;

FIG. 7 is a schematic structural view of a waist drum shaped irregular surface;

FIG. 8 is a schematic view of a slanted profile surface;

FIG. 9 is a schematic view of the impeller-type protrusions;

FIG. 10 is a schematic view of a straight notch configuration;

FIG. 11 is a schematic view of a guidewire passing through an occlusion, such as a thrombus;

FIG. 12 is a schematic view of the catheter device being threaded over the guidewire into the distal end of the thrombus;

FIG. 13 is a schematic view of the expandable rack assembly and the helical rotor assembly cutting away thrombus;

FIG. 14 is a schematic view of the withdrawal suction catheter;

FIG. 15 is a schematic view of the catheter device and guidewire being withdrawn simultaneously from the body;

FIG. 16 is a schematic structural view of a wave-shaped support wire;

FIG. 17 is a schematic view showing a structure of the cross-shaped expanding member;

FIG. 18 is a schematic view of a cutting helical expansion member;

FIG. 19 is a schematic view of the construction of a braided cross-shaped expansion member;

FIG. 20 is a schematic structural view of a braided helical expansion member;

fig. 21 is a schematic structural view of a strip-type rotary cutting member;

fig. 22 is a schematic structural view of a strip-convex rotary cutting member;

FIG. 23 is a schematic view of a cage-type notch;

FIG. 24 is a schematic view of a half slot configuration;

FIG. 25 is a schematic view of a helical lobe configuration;

FIG. 26 is a schematic view of a male projection of the ring;

FIG. 27 is a schematic view of a dental projection;

fig. 28 is a schematic view of a structure of a helical protrusion.

In the figure: 1. an expandable grid assembly; 11. a guide cap; 111. a through hole; 12. a telescopic pipe; 13. a connecting pipe; 14. an expansion member; 141. flattening the arc-shaped supporting wire; 142. a wave arc support wire; 143. cutting the cross-shaped expansion member; 144. cutting the helical expansion member; 145. weaving a cross-shaped expansion member; 146. braiding a helical expansion member; 15. a distal barrel portion; 16. a proximal barrel portion; 2. a helical rotor assembly; 21. a rotary cutting member; 211. a waist drum shaped special-shaped surface; 212. an inclined profile surface; 213. impeller-shaped protrusions; 214. a helical lobe; 215. a ring convex protrusion; 216. a tooth-shaped protrusion; 217. a helical wheel-shaped protrusion; 22. A screw rotor; 221. a straight notch type notch; 222. a cage-shaped notch; 223. a half-notch; 23. a strip-type rotary cutting member; 231. a notch; 24. a strip convex rotary cutting part; 3. a suction catheter; 31. a suction catheter hemostasis valve; 4. a delivery catheter; 41. a delivery catheter hemostasis valve; 5. a drive control handle; 51. a negative pressure suction port; 6. a guidewire.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easy to understand, the invention is further described with reference to the specific drawings.

The above-described apparatus is used as an example to illustrate the embodiments of the present invention. The embodiments described herein illustrate the inventive apparatus in a form suitable for retrieving a thrombotic occlusion within the human vasculature. It should be understood that the following examples discuss use in a blood vessel. However, unless otherwise noted, variations of the apparatus and methods are not limited to use in removing thrombi in blood vessels. Rather, the present invention can clear any obstruction or combination thereof as broadly defined above in a blood vessel. At the same time, the invention can have applicability in different parts of the human blood vessel. Further, the present invention may be used in a variety of processes where the benefits of the method and/or apparatus are desired.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

For purposes of the following terms, the terms clot, thrombus, embolus, and obstruction may be used synonymously. Although the present invention has been described with respect to an obstruction removal device, the device may also be used to capture blood clots, thrombi, emboli, foreign matter, and other matter. An expandable guide tip on the device can engage blood clots, thrombus, emboli, foreign bodies, emboli, and other materials.

For ease of description, the following description uses the terms "proximal" and "distal", where proximal refers to the end closer to the drive control handle and distal refers to the end further from the drive control handle.

Example 1:

as shown in fig. 1-15, an expandable net rack type mechanical thrombectomy catheter device includes an expandable net rack assembly 1, a helical rotor assembly 2, an aspiration catheter 3, a delivery catheter 4, and a drive control handle 5.

The expandable net rack assembly 1 includes a guide cap 11, a telescopic tube 12, a connecting tube 13, and an expansion member 14.

The catheter device further comprises a guide wire 6, and a through hole 111 penetrating through the guide wire 6 is formed in the guide cap 11 along the length direction. The expansion part 14 is composed of two or more supporting wires, the supporting wires at the near end of the expansion part 14 are sparse, so that thrombus can enter the expansion part 14 conveniently during withdrawal, and the supporting wires at the far end of the expansion part 14 are dense, so that the release of large thrombus can be prevented conveniently. The supporting wire is made of stainless steel or shape memory alloy and can be machined, linearly cut or laser-cut to form.

The cross-sectional shape of the support wire includes circular, rectangular and tile-shaped, the support wire is a flat arc-shaped support wire 141, and the expansion component 14 in a normal state is expanded to the peripheral side by the support wire.

The two ends of the supporting wire are respectively and fixedly provided with a far-end cylindrical part 15 and a near-end cylindrical part 16, the far-end cylindrical part 15 is connected with the guide cap 11 in a cementing mode, the near-end cylindrical part 16 is sleeved at the far end of the connecting pipe 13, and the near-end cylindrical part 16 and the connecting pipe 13 are fixedly connected together through interference fit, laser welding or cementing. The distal end of the connecting tube 13 may be retracted, flush or extend beyond the proximal cylindrical portion 16. The distal end of the connecting tube 13 extends beyond the proximal cylindrical portion 16 of the expansion member 14 to prevent the expansion member 14 from being damaged by the high-speed rotary-cut member 21. The proximal end of the connecting tube 13 is connected to the suction catheter 3.

The helical rotor assembly 2 includes a rotary cutting member 21 and a helical rotor 22, the proximal end of the helical rotor 22 externally connects with the driving control handle 5 to drive the rotation thereof, the rotary cutting member 21 is disposed at the distal end of the helical rotor 22. The rotary cutting member 21 may be inserted and clamped on the screw rotor 22, or may be laser welded on the screw rotor 22.

The rotary cutting part 21 is in an inclined reducing shape with the diameter of the near end smaller than that of the far end, and is convenient for the thrombus to be sucked into the suction catheter 3 when fluid is stirred. The rotary cutting member 21 is provided with a straight notch 221, and the straight notch 221 is formed by a rectangular through opening formed by penetrating the rotary cutting member 21 along the radial direction. The rotary cutting member 21 is provided with a waist drum-shaped irregular surface 211 or an inclined irregular surface 212, the rotary cutting member 21 is further provided with an impeller-shaped protrusion 213, the length of the rectangular block of the impeller-shaped protrusion 213 is the same as that of the rotating member 21, the rectangular block is arranged along the circumferential direction of the rotating member 21, and the impeller-shaped protrusion 213 is arranged on the surface of the rotating member 21.

The telescopic tube 12 is made of stainless steel material, the end part is conical or round, the far end of the telescopic tube 12 extends into the guide cap 11 and is fixed, the near end is inserted into the screw rotor 22, and the telescopic tube slides and extends along the through hole 111 on the screw rotor component 2.

The delivery catheter 4 is sleeved on the suction catheter 3, and the proximal end of the delivery catheter 4 is provided with a delivery catheter hemostasis valve 41. The proximal end of the aspiration catheter 3 is also provided with an aspiration catheter hemostasis valve 31 for withdrawing the broken thrombus and blood mixture. The driving control handle 5 is arranged at one end of the conveying conduit 4 far away from the guide cap 11, a negative pressure suction port 51 is arranged on the driving control handle 5, and the negative pressure suction port 51 is externally connected with a suction source or a liquid storage bag.

The working principle is as follows: firstly, a guide wire 6 penetrates through obstructions such as thrombus and the like to detect the position of blockage in a blood vessel, after the guide wire 6 intervenes in the blood vessel, an apparatus is guided to the position near the far end of the thrombus along the guide wire 6, the suction catheter 3 is kept still, the delivery catheter 4 is withdrawn towards the near end, so that the rotary cutting part 21 is completely exposed, the expansion part 14 pressed and held in the delivery catheter 4 is completely released, the blood vessel of the lesion part is opened by the expansion part 14, a motor is started, the spiral rotor component 2 is driven to rotate at a high speed, and the suction catheter 3 and the delivery catheter 4 outside the suction catheter 3 are slowly withdrawn towards the near end until the thrombus is completely removed.

When the expansion part 14 is withdrawn, thrombus enters the expansion part 14, the spiral rotor component 2 stirs the thrombus in the expansion part 14, breaks up the thrombus and sucks the thrombus into the suction catheter 3 to be transported out of the body, and at the moment, the far end of the expansion part 14 can prevent the large thrombus from dissociating.

In the process of sucking thrombus, thrombolytic drugs or normal saline can be injected through the delivery catheter 4, and the outlet at the far end of the delivery catheter 4 is positioned near the near end of a lesion part, so that thrombus can be thrombolytic and softened, and the suction is convenient to break. In addition, the expanding component 14 places the rotary-cut component 21 near the center of the blood vessel, which is convenient for stirring and breaking up thrombus, is beneficial to sucking the rotary-cut component 21 into the suction catheter 3, improves the suction efficiency, and simultaneously prevents the rotary-cut component 21 from damaging the blood vessel wall.

After the thrombus is completely sucked, the conveying catheter 4 is kept still, the sucking catheter 3 and the expansion part 14 are withdrawn and pressed in the conveying catheter 4, and finally the catheter device and the guide wire 6 are synchronously withdrawn out of the body.

Example 2:

as shown in fig. 16, unlike embodiment 1, the support wires in this embodiment are wave arc support wires 142.

Example 3:

as shown in fig. 2 and 17, unlike embodiment 1, the expanding member 14 in this embodiment is a cut cross-shaped expanding member 143 formed by wire cutting or laser cutting on a stainless steel or shape memory aluminum alloy pipe. The cutting cross-shaped expansion part 143 has sparse proximal support wires for facilitating thrombus to enter, and dense distal support wires for facilitating thrombus interception.

As shown in fig. 18, there may also be a cut helical expansion member 144 formed by wire cutting or laser cutting on a stainless steel or shape memory aluminum alloy tube.

Example 4:

as shown in fig. 2 and 19, the expansion member 14 in this embodiment is a braided cross-shaped expansion member 145 formed by braiding stainless steel wires or shape memory alloy wires.

As shown in fig. 2 and 20, a braided helical expansion member 146 may also be formed by braiding stainless steel wires or shape memory alloy wires. The support wires that weave the helical expansion member 146 weave to form a dense distal and open proximal expansion member 14.

As shown in fig. 2 and 3, the braided expanding member 14 has a distal end directly fused into the guide cap 11 and a proximal end requiring a remaining cylindrical portion bonded to the connecting tube 13.

Example 5:

as shown in fig. 4 and 21, different from embodiment 1, the rotary cutting member 21 in this embodiment is shaped like a strip, the strip-shaped rotary cutting member 23 is elongated and curved and arched from one side to the other side, the strip-shaped rotary cutting member 23 is provided with a notch 231, the notch 231 includes a semicircle and a square, and the edge of the notch 231 can be cut.

Example 6:

as shown in fig. 4 and 22, unlike embodiment 1, the rotary cutting member 21 in this embodiment is a strip-protrusion type rotary cutting member 24, and each strip protrusion is composed of an arc-shaped strip and a rectangular strip on one side, and the rectangular strip is arranged along the middle of the arched side of the arc-shaped strip.

Example 7:

as shown in fig. 4 and fig. 23, different from embodiment 1, the rotary cutting member 21 of this embodiment is provided with a cage-shaped notch 222, the cage-shaped notch 222 is formed by uniformly forming a plurality of elongated through openings on the side wall of the rotary cutting member 21, and the length of each elongated through opening is smaller than the length of the rotary cutting member 21.

Example 8:

as shown in fig. 4 and 24, unlike embodiment 1, in this embodiment, the rotary cutting member 21 is provided with a half notch 223, the half notch 223 is formed by cutting one end of the rotary cutting member 21 to the other end, and the half notch 223 is provided in a U shape.

Example 9:

as shown in fig. 4 and 25, unlike embodiment 1, the rotary cutting member 21 of the present embodiment is provided with the oblique impeller-shaped protrusion 214, the oblique impeller-shaped protrusion 214 is formed by arranging a plurality of rectangular blocks having the same length as that of the rotary member 21 along the circumferential direction of the rotary member 21, and each rectangular block is inclined in the same direction at an angle with respect to the surface of the rotary cutting member 21.

Example 10:

as shown in fig. 4 and fig. 26, unlike the embodiment 1, the rotary cutting member 21 of the present embodiment is provided with the annular convex protrusions 215, and the annular convex protrusions 215 are uniformly distributed along the axial direction of the rotary cutting member, and each annular protrusion protrudes from the surface of the rotary cutting member.

Example 11:

as shown in fig. 4 and 27, unlike the embodiment 1, the rotary cutting member 21 of the embodiment is provided with a tooth-shaped protrusion 216, and the tooth-shaped protrusion 216 is formed by a plurality of protrusions evenly distributed on the surface of the rotary cutting member 21.

Example 12:

as shown in fig. 4 and fig. 28, unlike embodiment 1, the rotary cutting member 21 of the present embodiment is provided with a spiral-shaped protrusion 217, and the spiral-shaped protrusion 217 is formed by a plurality of spirally-raised convex strips uniformly distributed on the surface of the rotary cutting member.

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

Claims (10)

1. An expandable net rack type mechanical thrombectomy catheter device, which is characterized by comprising an expandable net rack assembly (1), a spiral rotor assembly (2), a suction catheter (3) and a delivery catheter (4), wherein the proximal end of the spiral rotor assembly (2) is connected to a driving control handle (5), the distal end of the spiral rotor assembly is arranged in the expandable net rack assembly (1), and the suction catheter (3) is arranged in the delivery catheter (4);

the spiral rotor assembly (2) comprises a rotary cutting component (21) and a spiral rotor (22), wherein the rotary cutting component (21) is arranged at the far end of the spiral rotor (22);

the expandable net rack assembly (1) comprises a guide cap (11), an extension tube (12), a connecting tube (13) and an expansion component (14), wherein the far end of the expansion component (14) is connected with the guide cap (11), the near end of the expansion component is connected with the suction catheter (3) through the connecting tube (13), the near end of the extension tube (12) is inserted into the spiral rotor assembly (2), and the far end of the extension tube is connected with the guide cap (11).

2. An expandable net rack mechanical thrombectomy catheter device according to claim 1, wherein the expanding member (14) comprises a support wire having a cylindrical end at both ends, and the connecting tube (13) is fixedly connected to the cylindrical end.

3. The expandable net-frame mechanical thrombectomy catheter device according to claim 2, wherein the expansion member (14) comprises two or more support wires.

4. The expandable net-frame mechanical thrombectomy catheter device according to claim 2, wherein the support wires comprise flat curved support wires (141) and wavy curved support wires (142).

5. The expandable net-rack mechanical thrombectomy catheter device according to claim 1, wherein the end shape of the telescoping tubes (12) comprises tapered and rounded.

6. The expandable net-rack mechanical thrombectomy catheter device of claim 2, wherein the expansion member (14) comprises a cut cross expansion member (143), a cut helical expansion member (144), a braided cross expansion member (145), and a braided helical expansion member (146).

7. The expandable net-frame-type mechanical thrombectomy catheter device according to claim 1, wherein the atherectomy member (21) comprises a blade-type atherectomy member (23) and a blade-protrusion-type atherectomy member (24).

8. The mechanical thrombectomy catheter device of claim 7, wherein the atherectomy member (21) comprises notches comprising a straight notch (221), a cage notch (222) and a half notch (223).

9. The expandable rack-based mechanical thrombectomy catheter device of claim 8, wherein the atherectomy member (21) comprises protrusions comprising impeller-type protrusions (213), helical impeller-type protrusions (214), annular protrusions (215), teeth-type protrusions (216), and helical screw-type protrusions (217).

10. The mechanical thrombectomy catheter device of claim 8, wherein the plurality of stripped rotary-cut members (23) define a notch (231), and the shape of the notch (231) includes a semi-circle and a square.

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