CN215652915U - Suction catheter assembly - Google Patents

Abstract

The utility model provides an aspiration catheter assembly, which comprises a catheter body and a supporting mechanism; wherein the catheter body comprises a main body section and an expansion section, the expansion section is connected to the distal end of the main body section, and the expansion section is configured to generate elastic deformation and expand along the radial direction when being applied with a force along the radial direction; the support mechanism is configured to be disposed at least partially inside the catheter body, and is configured to be movable in an axial direction of the catheter body, and to apply the force to the expandable section. By the arrangement, the expanded section of the catheter body has a smaller inner diameter in the conveying process, and is expanded to have a larger inner diameter through the supporting mechanism before thrombus is sucked, so that the suction effect is ensured, the overall size of the catheter body in the conveying process is reduced, the conveying resistance is reduced, and the catheter body can easily pass through a tortuous blood vessel.

Description

Suction catheter assembly

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an aspiration catheter assembly.

Background

Acute stroke is a common cerebrovascular disease, has the characteristics of acute onset, rapid development, severe symptoms, high disability rate and high fatality rate, and belongs to the critical condition of cerebrovascular diseases. The cerebral apoplexy can be divided into hemorrhagic stroke and ischemic stroke, wherein the occupation ratio of the ischemic stroke is up to 70-80%. The pathogenesis of acute ischemic stroke is that acute occlusion of cerebral arteries is caused by thrombus or arteriosclerosis plaques falling off from the walls of diseased blood vessels, and then a series of irreversible physiopathological reactions such as inflammatory reaction, apoptosis and the like are generated in ischemic brain tissues. If the blood perfusion of the cerebral vessels can be recovered in a short time, the cell metabolism of the brain tissues can be recovered to be normal, and the further development into an infarct area is avoided.

At present, the main treatment methods of acute ischemic stroke comprise intravenous thrombolysis and interventional thrombus removal. The intravenous thrombolysis is intravenous injection thrombolysis medicine, the treatment time window is within 3 hours after the disease occurs, but most patients miss the treatment time window when the patients are in hospital after the disease occurs, so that the intravenous thrombolysis effect is seriously reduced, and the blocked blood vessels cannot be effectively opened. The interventional thrombus removal is to introduce a thrombus removal device from the femoral artery, enter the cerebral vessels, remove the thrombus and restore the blood flow. Interventional embolectomy can extend the therapeutic time window of ischemic stroke to 8 hours after onset. Based on a series of clinical randomized controlled trial studies, patients with large vessel occlusion within 6 hours recommended by the relevant international organization may be given priority for interventional embolectomy.

Interventional embolectomy can be broadly divided into two categories: a thrombus removal support and a suction catheter. The thrombus taking support is characterized in that a micro catheter embedded with the thrombus taking support is conveyed into a blood vessel under the assistance of a micro guide wire and penetrates thrombus or a gap between the thrombus and a blood vessel wall to reach the far-end side of the thrombus, and then the thrombus taking support is released by withdrawing the micro catheter, so that the thrombus can be sunk into the thrombus taking support and fixed, then the thrombus taking support is withdrawn into the micro catheter, and then the thrombus taking support and the micro catheter are withdrawn and the thrombus is removed from the body. The thrombus taking support is directly contacted with thrombus, and mechanical extrusion and embedding effects exist between the thrombus taking support and the thrombus, so that the condition that secondary thrombus fragments fall off is inevitably generated in the operation process, and the fallen thrombus fragments can cause vascular embolism which is more difficult to treat if the fallen thrombus fragments are washed into thinner blood vessels at the downstream by blood flow. Unlike thrombus removal stents, aspiration catheters rely on negative pressure aspiration rather than mechanical squeezing during thrombus removal, specifically, a catheter with a large inner diameter is pushed to the vicinity of the thrombus, and then the thrombus is aspirated by negative pressure. The thrombus with low hardness can be directly sucked into the catheter and discharged out of the body, and the thrombus with high hardness is adsorbed at the distal end of the catheter and is removed out of the body along with the withdrawal of the catheter. To increase the suction capacity of the suction catheter, the catheter usually has a larger inner diameter, which results in a larger overall size of the catheter, which in turn is disadvantageous for the passage of the catheter through tortuous vessels, especially in the region of the branching of the ophthalmic artery, where larger sized catheters are easily stuck. Moreover, there is the space between traditional suction catheter and the vascular cavity, when the suction adsorbs the thrombus, the thrombus is still strikeed to the cisoid blood flow, and then reduces the suction effect to and adsorb in the high rigidity thrombus of catheter distal end, also probably take place to fluctuate and produce the risk of droing because of the negative pressure at the in-process that moves out the external along with catheter withdrawal.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide an aspiration catheter assembly which addresses at least one of the aforementioned problems.

To achieve the above object, the present invention provides an aspiration catheter assembly comprising a catheter body and a support mechanism; wherein the content of the first and second substances,

the catheter body comprises a main body section and an expansion section, wherein the expansion section is connected to the distal end of the main body section, and is configured to generate elastic deformation and expand along the radial direction when being applied with a force along the radial direction;

the support mechanism is configured to be disposed at least partially inside the catheter body, and is configured to be movable in an axial direction of the catheter body, and to apply the force to the expandable section.

Optionally, the support mechanism and the catheter body are of a split structure.

Optionally, the supporting mechanism includes a pushing portion and a supporting portion, and the supporting portion is connected to a distal end of the pushing portion;

the support portion is configured to be in a compressed state when the support portion is located inside the main body section, and to apply the acting force to the expanding section when the support portion is located inside the expanding section and expanded in a circular ring shape and arranged coaxially with the expanding section.

Optionally, the pushing portion includes at least one pushing rod, a distal end of the pushing rod is fixedly connected to the supporting portion, and when the supporting portion is in a natural state, axes of the pushing rod and the supporting portion are parallel to each other.

Optionally, the pushing part comprises two pushing rods, and the two pushing rods are symmetrically arranged in the circumferential direction of the supporting part; the pushing rod comprises a rod body and a connecting ring connected to the far end of the rod body, the connecting ring is sleeved on the supporting portion, and the pushing rod can rotate relative to the supporting portion.

Optionally, a first visualization element is arranged at the distal end of the expansion section, a second visualization element is arranged on the support mechanism, and the second visualization element and the first visualization element are used for indicating the position of the distal end of the support mechanism in the catheter body.

Optionally, a limiting part is arranged on the inner wall of the distal end of the expanding section, and the limiting part is used for limiting the distal end of the supporting mechanism inside the catheter body.

Optionally, in a natural state, the cross-section of the dilating segments decreases in a proximal to distal direction.

Optionally, the catheter body comprises a first tube and a second tube, the second tube being disposed inside the first tube, and a distal section of the second tube extending from a distal end of the first tube and constituting the flared section.

Optionally, the catheter body further comprises a lubricating layer disposed on the inner surface of the second tube, and the distal end face of the lubricating layer is flush with the distal end face of the first tube.

Compared with the prior art, the suction catheter assembly of the utility model has the following advantages:

the suction catheter assembly comprises a catheter body and a supporting mechanism; wherein the catheter body comprises a main body section and an expansion section, the expansion section is connected to the distal end of the main body section, and the expansion section is configured to be elastically deformed and radially expanded when being subjected to a force in a radial direction outwards; the support mechanism is configured to be disposed at least partially on an inner wall of the catheter body, and is configured to be movable in an axial direction of the catheter body, and to apply the force to the expandable section. By the arrangement, the expanded section of the catheter body has a smaller inner diameter in the conveying process, and is expanded to have a larger inner diameter through the supporting mechanism before thrombus is sucked, so that the suction effect is ensured, the overall size of the catheter body in the conveying process is reduced, the conveying resistance is reduced, and the catheter body can easily pass through a tortuous blood vessel. Moreover, the size of the supporting mechanism can be reasonably selected, so that when the acting force is applied to the expansion section to expand the expansion section, the outer diameter of the expansion section can be increased to be matched with the inner diameter of the blood vessel, the blood flow is temporarily blocked in the suction process, and the blood flow is prevented from impacting thrombus to reduce the suction efficiency.

Furthermore, the supporting mechanism and the catheter body are of a split structure, so that an operator can convey the catheter body firstly and then convey the supporting mechanism in the operation process, and the catheter body is not influenced by the supporting mechanism in the conveying process of the catheter body, has good flexibility and can pass through tortuous blood vessels more easily.

Still further, in a natural state, the cross section of the expanding section is gradually reduced along the direction from the proximal end to the distal end, that is, the catheter body can release the acting force applied to the expanding section by the supporting mechanism after adsorbing the thrombus into the expanding section, and the expanding section can radially contract and tends to return to the natural state, so that the expanding section can actually radially press the thrombus to keep the thrombus in the expanding section, and the possibility of falling of the thrombus is reduced.

Drawings

The drawings are included to provide a better understanding of the utility model and are not to be construed as unduly limiting the utility model. Wherein:

FIG. 1 is a schematic structural view of an aspiration catheter assembly provided in accordance with an embodiment of the present invention, illustrating a natural state of an expandable section;

FIG. 2 is a schematic structural view of an aspiration catheter assembly provided in accordance with an embodiment of the present invention, illustrating a radially expanded section;

fig. 3a to 3d are schematic views illustrating the use of the aspiration catheter assembly according to an embodiment of the present invention.

FIG. 4 is a schematic structural view of a support mechanism of an aspiration catheter assembly provided in accordance with another embodiment of the present invention, illustrating the support portion in a compressed state;

FIG. 5 is a schematic structural view of a support mechanism of an aspiration catheter assembly provided in accordance with another embodiment of the present invention, illustrating expansion of the support portion to form a circular ring;

FIG. 6 is an enlarged schematic view at A in FIG. 4;

FIGS. 7a and 7b are schematic views illustrating the use of an aspiration catheter assembly according to another embodiment of the present invention.

[ reference numerals are described below ]:

100-catheter body, 110-main tube section, 120-expansion section;

200-support mechanism, 210-support part, 220-push rod, 220 a-first push rod, 220 b-second push rod, 221-rod body, 222-connecting ring, 230-clamp;

1-micro guide wire;

10-thrombosis.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Furthermore, each of the embodiments described below has one or more technical features, and thus, the use of the technical features of any one embodiment does not necessarily mean that all of the technical features of any one embodiment are implemented at the same time or that only some or all of the technical features of different embodiments are implemented separately. In other words, those skilled in the art can selectively implement some or all of the features of any embodiment or combinations of some or all of the features of multiple embodiments according to the disclosure of the present invention and according to design specifications or implementation requirements, thereby increasing the flexibility in implementing the utility model.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The core idea of the utility model is to provide an aspiration catheter assembly to solve the problem that the prior art improves the aspiration performance by increasing the inner diameter of the aspiration catheter, but causes the over-bending performance of the aspiration catheter to be reduced and is not beneficial to pushing. The utility model provides an aspiration catheter assembly comprising a catheter body and a support mechanism. Wherein the catheter body comprises a main body section and an expansion section, the expansion section is connected to the distal end of the main body section, and the expansion section is configured to be elastically deformed and expand outwards in the radial direction when being subjected to a force outwards in the radial direction. The support mechanism is configured to be disposed at least partially inside the catheter body, and is configured to be movable in an axial direction of the catheter body, and to apply the force to the expandable section. In use, the aspiration catheter assembly has two processes, one being a delivery process and the other being an aspiration process. When the suction catheter assembly is in the conveying process, the expansion section is in a natural state and has a smaller inner diameter and a smaller outer diameter, so that the catheter body is facilitated to pass through a tortuous blood vessel, and the pushing performance of the catheter body can be improved. When the suction catheter assembly is in the suction process, the support mechanism applies the acting force to the expansion section and enables the expansion section to have a larger inner diameter and a larger outer diameter, so that the suction force is improved, and when the outer diameter of the expansion section is matched with the inner diameter of the blood vessel, the blood flow can be temporarily blocked, and the phenomenon that the blood flow impacts thrombus to weaken the suction effect can be avoided.

To further clarify the objects, advantages and features of the present invention, a more particular description of the utility model will be rendered by reference to the appended drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements.

Fig. 1 and 2 are schematic structural views illustrating an aspiration catheter assembly according to an embodiment of the present invention. Referring to fig. 1 and 2, the suction catheter assembly includes a catheter body 100 and a support mechanism 200. Wherein the catheter body 100 comprises a main body section 110 and a dilating section 120, the dilating section 120 is connected to the distal end of the main body section 110, and the dilating section 120 is configured to be elastically deformed and radially dilated when subjected to a radially outward force. Here, the elastic deformation refers to a deformation that can be restored, that is, the expansion section 120 can be restored to the shape when the force is removed. The support mechanism 200 is configured to be disposed at least partially inside the catheter body 100, and is configured to be movable in an axial direction of the catheter body 100, and to apply the force to the expanding section 120 to radially expand the expanding section 120.

In an embodiment of the present invention, the expanding section 120 can be expanded radially to have a larger inner diameter and a larger outer diameter after receiving the force from the supporting mechanism 200. That is, the expanding section 120 has a smaller inner diameter and a smaller outer diameter when not subjected to the force. Thus, when the thrombus 10 in the blood vessel (as shown in fig. 3a to 3 d) is sucked by the aspiration catheter assembly, the support mechanism 200 does not apply the force to the expandable section 120 during the pushing process to improve the pushability of the catheter body 100 and allow the catheter body 100 to smoothly pass through a tortuous blood vessel, and when the distal end of the catheter body 100 reaches the vicinity of the thrombus 10, the support mechanism 200 applies the force to the expandable section 120 to increase the inner diameter of the expandable section 120, thereby increasing the suction force and improving the aspiration effect on the thrombus 10. Furthermore, the expanding section 120 can also be expanded to an outer diameter matched with the inner diameter of the blood vessel, so that the expanding section 120 temporarily closes the blood vessel upstream of the thrombus 10 to block the blood flow during the suction process, thereby avoiding the blood from impacting the thrombus 10 and reducing the suction effect.

Further, when the expanding section 120 is in a natural state, the expanding section 120 is a tapered structure with a cross section gradually decreasing from a proximal end to a distal end. This has the advantage that, when the thrombus 10 is absorbed into the interior of the dilating segment 120, the force applied by the supporting mechanism 200 to the dilating segment 120 can be cancelled, so that the dilating segment 120 contracts in the radial direction and tends to return to the conical structure, thereby applying a radial pressing force to the thrombus 10 and clamping the thrombus 10, and reducing the possibility that the thrombus 10 falls off due to negative pressure fluctuation during the process of moving out of the body. The natural state is defined herein as the state that the expanding section 120 is in when not subjected to the force provided by the support mechanism 200.

The dilating segments 120 are made of an elastic material, and alternative materials include, but are not limited to, polyetheramide block copolymers, styrene, thermoplastic polyolefin elastomers, polyester elastomers, thermoplastic polyurethane elastomers, polyamides, rubbers, and the like. The main body 110 may be a conventional tube, which may be a metal tube, a polymer tube, a single-layer tube, a multi-layer tube, a single-lumen tube, or a multi-lumen tube (for example, including two lumens, one of which serves as a negative pressure channel and the other serves as a guide wire channel), which is not limited in the embodiments of the present invention. The main body segment 110 and the expanding segment 120 may be formed separately and then connected together by any suitable method, such as heat shrinking, crimping, sewing, etc., or the expanding segment 120 may be formed integrally with the main body segment 110.

In an exemplary embodiment, the catheter body 100 includes a first tubular body made of a material that is a polyetheramide block copolymer and a second tubular body made of a material that is a thermoplastic polyolefin elastomer. The first tube and the second tube are extruded at one time by an extruder, the second tube is disposed inside the first tube, and a distal segment of the second tube is extended from a distal end of the first tube and then is thermally processed to form the tapered expanding section 120. Further, the catheter 100 further includes a lubricating layer disposed on the inner surface of the second tubular body, and a distal end surface of the lubricating layer is flush with a distal end surface of the first tubular body. The lubricating layer may be made of teflon, and is provided to reduce resistance when the supporting mechanism 200 and the micro-guide wire 1 (shown in fig. 3 a) and the catheter body 100 move relative to each other in the axial direction. The lubricating layer may also be extruded together with the first pipe body and the second pipe body. In this embodiment, the axial length of the expanding section 120 may be about 1 cm.

Preferably, the support mechanism 200 is a split structure with the catheter body 100. In doing so, the catheter body 100 and the support mechanism 200 may be delivered separately, i.e., during use, the catheter body 100 is delivered first, and then the support mechanism 200 is delivered. Compared with the integral delivery, the embodiment has the advantage that the catheter body 100 can maintain better flexibility and can pass through tortuous vessels more easily during the process of delivering the catheter body 100 alone.

With continued reference to fig. 1 and fig. 2, the supporting mechanism 200 includes a pushing portion and a supporting portion 210, the supporting portion 210 is connected to a distal end of the pushing portion, and the pushing portion is configured to move along an axial direction of the catheter body 100 under an external force and drive the supporting portion 210 to move. The supporting portion 210 is configured such that when the supporting portion 210 is located inside the main body section 110, the supporting portion 210 is in a compressed state, and when the supporting portion 210 is located inside the expanding section 120 and expands in a circular ring shape and is coaxially arranged with the expanding section 120, the supporting portion 210 applies the force to the expanding section 120 to radially expand the expanding section 120.

The support portion 210 is preferably a self-expanding structural member and has a circular ring shape when it is in a natural state. The self-expandable structural member is made of a high-elasticity material, can be pre-molded to be in a preset shape (the preset shape of the supporting part 210 is a circular ring shape), deforms when the self-expandable structural member is subjected to external pressure or pulling force, and restores to deform under the action of the elasticity of the self-expandable structural member when the external pressure or pulling force is cancelled. The material of the self-expanding structural member may be a shape memory alloy, such as nitinol. In one embodiment, the pushing part includes at least one pushing rod 220, a distal end of the pushing rod 220 is fixedly connected to the supporting part 210, and when the supporting mechanism 200 is in a natural state, axes of the pushing rod 220 and the supporting part 210 are parallel to each other. Of course, when the supporting portion 210 is in a compressed state, the pushing rod 220 may be parallel to the supporting portion 210. The push rod 220 delivers the support portion 210 in a compressed state into the expandable section 120 in the axial direction of the catheter body 100, and then the support portion 210 self-expands and returns to a circular ring shape to apply the force to the expandable section 120. It is understood that the spring force generated by the expanding section 120 when subjected to the force should be less than the self-expanding force of the supporting portion 210.

The suction catheter assembly of this example was then tested using a vascular model.

Test preparation: the experimental rabbits were taken and blood was collected in their ear vein 5m l for use. The middle brain segment of the intracranial vascular model was then opened. Mixing the taken blood with thrombin, immediately injecting the mixture into a blood vessel section, waiting for 3-5 min, and waiting for blood to coagulate and form thrombus. The vessel model is then closed.

And (3) testing:

first, the expandable section 120 of the catheter body 100 is delivered along the micro-guidewire 1 to the site of the blood vessel model where the thrombus 10 is formed (as shown in fig. 3 a).

The micro-guidewire 1 is then withdrawn from the body.

Thereafter, the support portion 210 is introduced into the catheter body 100, and the support portion 210 is pushed along the axial direction of the main tube body 110 by the push rod 220 (as shown in fig. 3 b).

After the supporting portion 210 enters the interior of the expanding section 120, the supporting portion 210 expands to a ring shape in the expanding section 120, and the expanding section 120 is radially expanded. The pushing of the supporting portion 210 is continued until the supporting portion reaches the distal end of the dilating segment 120, at which point the dilating segment 120 dilates into a funnel-like structure with a cross-section that gradually increases from the proximal end to the distal end (as shown in fig. 3 c).

Subsequently, a negative pressure device is connected to the proximal end of the main tube body 110, and aspiration of the thrombus 10 is started to enter the thrombus 10 into the inside of the expanding section 120.

The support mechanism 200 is then withdrawn, causing the expandable section 120 to radially contract and grip the thrombus 10 (as shown in FIG. 3 d). It is understood that upon withdrawal of the support mechanism 200, the support portion 210 may compress under the pressure of the tube wall of the main tube body 110.

Finally, the catheter body 100 with the thrombus 10 entrained is withdrawn.

In this embodiment, the distal end of the dilating segment 120 is further provided with a first developing element, the supporting mechanism 200 may be provided with a second developing element, and the position of the supporting portion 210 in the catheter body 100 is determined by the relative position of the second developing element and the first developing element, so as to avoid pushing the supporting portion 210 to the outside of the dilating segment 120. Specifically, the distal end of the pushing rod 220 or the supporting portion 210 is provided with the second developing element, and when the second developing element is aligned with the first developing element in the axial direction of the catheter body 100, it indicates that the supporting portion 210 has reached the distal end of the expanding section 120. Alternatively, the inner wall of the distal end of the expanding section 120 is provided with a limiting part, for example, an annular limiting protrusion. When the supporting portion 210 abuts against the stopper portion, it indicates that the supporting portion 210 has reached the distal end of the expanding section 120.

In addition, the suction catheter assembly further includes a connecting seat (not shown in the figures), and the first connecting seat is provided with a plurality of interfaces, for example, two interfaces, one interface is used for the micro guide wire and the supporting mechanism to penetrate through, and the other interface is used for connecting the negative pressure device.

In another embodiment, as shown in fig. 4 to 6, the pushing part includes two pushing rods 220, and the two pushing rods 220 are symmetrically arranged in the circumferential direction of the supporting part 210. The pushing rod 220 includes a rod body 221 and a connecting ring 222 connected to a distal end of the rod body 221, and the connecting ring 222 is sleeved on the supporting portion 210 and enables the pushing rod 220 to rotate relative to the supporting portion 210. It should be noted that, a positioning mechanism is disposed on the supporting portion 210, and the positioning mechanism is used for positioning the two pushing rods 220 at predetermined positions of the supporting portion 210 and maintaining the symmetrical arrangement.

In this embodiment, the use of the aspiration catheter assembly is as follows:

first, the expanded section of the catheter body 100 is delivered over a micro-guidewire 1 to the area of the blood vessel where the thrombus 10 is formed (as shown in fig. 3 a).

Then, the support portion 210 in a compressed state is introduced into the proximal end of the catheter body 100, so that the two pushing rods 220 are held axially relatively stationary, for example, the two pushing rods 220 are clamped by a clamp 230 so as to be held axially relatively stationary, and the two pushing rods 220 are used to push the support portion 220 together along the axial direction of the catheter body 100. In this process, the pushing rods 220 extend along the axial direction of the catheter body 100, and the distal ends of the two pushing rods 220 are staggered and not perpendicular to the supporting portion 210. For convenience of description, the two pushing rods 220 are respectively referred to as a first pushing rod 220a and a second pushing rod 220b, wherein a distal end of the first pushing rod 220 is located at a distal end side of the second pushing rod 220 b. The first push rod 220a applies a first force directed to the distal end to the support portion 210, and the second push rod 220b applies a second force directed to the proximal end to the support portion 210, so that the positioning portion 210 is stretched into an oval structure or a folded-in-half linear structure to be in a compressed state (as shown in fig. 7 a).

When the side of the supporting portion 210 close to the distal end of the catheter body reaches the distal end of the expanded section 120, the first pushing rod 220a is kept fixed, the clamp 230 is removed, and the second pushing rod 220b is continuously controlled to move towards the distal end, at this time, the second pushing rod 220b rotates relative to the supporting portion 210, and the first pushing rod 220a also rotates relative to the supporting portion 210, until the first pushing rod 220a and the second pushing rod 220b are perpendicular to the supporting portion 210, and at the same time, the supporting portion 210 gradually expands from expanding to restoring to a circular ring shape, and the expanded section 120 is radially expanded (as shown in fig. 7 b).

Thereafter, a negative pressure device is connected to the proximal end of the main tube body 110, and aspiration of the thrombus 10 is started so that the thrombus 10 enters the inside of the expanding section 120. In this process, the two pushing rods 220 can be clamped by the clamp 230, so that the two pushing rods 220 can be kept relatively still, and the pushing rods 220 can be kept fixed by other external mechanisms.

Next, the supporting mechanism 200 is withdrawn, and when the supporting mechanism 200 is withdrawn, a user may withdraw one of the pushing rods 220 first, so that the supporting portion 210 is switched to the compressed state, and then the supporting mechanism 200 is withdrawn as a whole.

Finally, the catheter body 100 with the entrained thrombus is withdrawn.

It can be understood that in the present embodiment, the distal end of the expanding section 120 may be provided with a first developing element, and the distal end of the first pushing rod 220a may be provided with a second developing element, so as to determine whether the supporting portion 210 reaches the distal end of the expanding section 120, so as to prevent the supporting portion 210 from protruding out of the expanding section 120. Alternatively, a limiting portion may be disposed on the inner wall of the distal end of the expanding section 120.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. An aspiration catheter assembly comprising a catheter body and a support mechanism; wherein the content of the first and second substances,

the catheter body comprises a main body section and an expansion section, wherein the expansion section is connected to the distal end of the main body section, and is configured to generate elastic deformation and expand along the radial direction when being applied with a force along the radial direction;

the support mechanism is for being disposed partially inside the catheter body, is configured to be movable in an axial direction of the catheter body, and is for applying the force to the expandable section.

2. The assembly of claim 1, wherein the support mechanism is a split structure with the catheter body.

3. The aspiration catheter assembly of claim 1 or 2, wherein the support mechanism comprises a pushing portion and a support portion, the support portion being connected to a distal end of the pushing portion;

the support portion is configured to be in a compressed state when the support portion is located inside the main body section, and to apply the acting force to the expanding section when the support portion is located inside the expanding section and expanded in a circular ring shape and arranged coaxially with the expanding section.

4. The aspiration catheter assembly of claim 3, wherein the pushing portion comprises at least one pushing rod, the distal end of the pushing rod is fixedly connected with the support portion, and the axes of the pushing rod and the support portion are parallel to each other when the support portion is in a natural state.

5. The aspiration catheter assembly of claim 3, wherein the pushing portion comprises two pushing rods, the two pushing rods being symmetrically arranged in a circumferential direction of the support portion; the pushing rod comprises a rod body and a connecting ring connected to the far end of the rod body, the connecting ring is sleeved on the supporting portion, and the pushing rod can rotate relative to the supporting portion.

6. The aspiration catheter assembly of claim 1 or 2, wherein the distal end of the dilating segment is provided with a first visualization element, the support mechanism is provided with a second visualization element, and the second visualization element and the first visualization element are used to indicate the position of the distal end of the support mechanism within the catheter body.

7. The aspiration catheter assembly of claim 1 or 2, wherein the inner wall of the distal end of the dilating segment is provided with a limiting portion for limiting the distal end of the support mechanism inside the catheter body.

8. An aspiration and catheter assembly according to claim 1 or 2 wherein the cross-section of the dilating segments gradually decreases in a proximal to distal direction in a natural state.

9. The aspiration catheter assembly of claim 1 or 2, wherein the catheter body comprises a first tube and a second tube, the second tube being disposed inside the first tube, and a distal section of the second tube extending from a distal end of the first tube and constituting the dilating segment.

10. The aspiration catheter assembly of claim 9, wherein the catheter body further comprises a lubricious layer disposed on an inner surface of the second tube, and a distal end face of the lubricious layer is flush with a distal end face of the first tube.

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