CN115778486A

CN115778486A - Deep vein thrombus taking device

Info

Publication number: CN115778486A
Application number: CN202211631642.2A
Authority: CN
Inventors: 徐东岳; 齐大鹏; 马立金
Original assignee: Beijing Guanqiao Medical Technology Co ltd
Current assignee: Beijing Guanqiao Medical Technology Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-03-14

Abstract

The application relates to the technical field of medical equipment, in particular to a deep vein thrombus taking device. The invention provides a deep vein thrombus taking device, which comprises a thrombus taking unit and a thrombus suction unit; the thrombus removal unit comprises a thrombus removal support capable of elastically contracting and expanding, and a conveying assembly connected with the thrombus removal support and used for carrying the thrombus removal support and controlling the thrombus removal support to expand and contract; the thrombus suction unit comprises a suction catheter, the thrombus taking support and the conveying assembly are movably connected in the suction catheter in a penetrating mode, an outer expanding opening capable of being elastically deformed is formed in the far end of the suction catheter, the thrombus taking support is matched with the outer expanding opening, the contracted thrombus taking support is retracted into the suction catheter, and collected thrombus is sucked and removed through the outer expanding opening.

Description

Deep vein thrombus taking device

Technical Field

The application relates to the technical field of medical equipment, in particular to a deep vein thrombus taking device.

Background

Clinically, only 10% to 17% of patients with deep vein thrombosis of the lower extremities (DVT) have significant symptoms. Including lower limb swelling, localized deep tenderness and dorsiflexion pain. The most severe clinical feature and sign of DVT development is pulmonary embolism with mortality rates of up to 9% to 50%, with the vast majority of deaths dying within minutes to hours.

The treatment of deep vein thrombosis requires early detection and early treatment principles, so that the symptoms of patients can be relieved to the maximum extent. Generally speaking, the deep venous thrombosis needs anticoagulation and coagulation removal treatment, and the clinically common medicines comprise warfarin, low molecular heparin sodium and aspirin; the patient lies in bed for rest and raises the affected limb; timely performing lower limb vein color Doppler ultrasound examination or lower limb deep vein angiography, determining the range of pathological changes, and selecting interventional therapy or thrombolytic therapy.

In addition, the former has slow effect, generally takes more than one week to exert the anticoagulation effect, and the latter has high bleeding risk, especially fatal cerebral hemorrhage of elderly patients may occur, and the two treatments have no effect on organized thrombus.

Disclosure of Invention

The utility model aims at providing a dark vein thrombectomy device can draw the thrombus in the blood vessel with the form of mechanical thrombectomy, opens the blood vessel fast, resumes the blood flow, obtains blood perfusion as early as possible.

In order to achieve the purpose, the invention provides a deep vein thrombus taking device, which comprises a thrombus taking unit and a thrombus suction unit;

the thrombus removing unit comprises a thrombus removing bracket capable of elastically contracting and expanding, and a conveying assembly connected with the thrombus removing bracket, wherein the conveying assembly is used for carrying the thrombus removing bracket and controlling the thrombus removing bracket to expand and contract;

the thrombus suction unit comprises a suction catheter, the thrombus taking support and the conveying assembly are movably connected in the suction catheter in a penetrating mode, an outer expanding opening capable of being elastically deformed is arranged at the far end of the suction catheter, the thrombus taking support is matched with the outer expanding opening, the contracted thrombus taking support is retracted into the suction catheter, and collected thrombus is sucked and removed through the outer expanding opening.

In an optional embodiment, the thrombus removal support comprises a dense network segment and a sparse network segment, the sparse network segment is connected to the near end of the dense network segment in a weaving mode, and the far end of the dense network segment is connected with the far end of the conveying component.

In an optional embodiment, the conveying assembly comprises an inner pipe, an intermediate pipe and an outer pipe which are sleeved in an inner-outer mode, the inner pipe, the intermediate pipe and the outer pipe can stretch and retract in a movable mode, the far end of the compact net section is connected with the far end of the inner pipe, and a marking block is arranged on the far end of the inner pipe.

In an alternative embodiment, the proximal end of the sparse network segment is connected to the distal end of the middle tube, the distal end of the middle tube is provided with a marker ring, and the thrombectomy stent in a compressed state is accommodated in an annular gap between the inner tube and the outer tube.

In an optional embodiment, the inner tube is connected in the embolectomy bracket in a penetrating manner, can movably extend and retract relative to the embolectomy bracket and is used for adjusting the deformation amount of the embolectomy bracket;

the sparse network segment is connected with a limiting ring, the inner pipe is sleeved with a limiting check ring, and the limiting check ring is arranged on the far end side of the limiting ring.

In an optional embodiment, the proximal end of the outer tube is connected with an outer tube hemostasis valve, the proximal end of the middle tube is connected with a middle tube hemostasis valve, the middle tube extends into the outer tube from the outer tube hemostasis valve, and a luer connector is arranged between the outer tube hemostasis valve and the middle tube hemostasis valve and is sleeved on the middle tube.

In an optional embodiment, a needle seat is connected to the proximal end of the inner tube, the needle seat is connected to a stainless steel tube, position marks are arranged on the stainless steel tube, the inner tube extends into the intermediate tube from the intermediate tube hemostatic valve, and the stainless steel tube is sleeved at the proximal end of the inner tube and is inserted into the intermediate tube hemostatic valve.

In an optional embodiment, the proximal end of the suction catheter is connected with a suction catheter hemostasis valve, the suction catheter hemostasis valve comprises a lateral branch, the proximal end of the lateral branch is provided with a connector, and the connector is connected with an aspirator for providing suction negative pressure.

In an alternative embodiment, the suction plug unit further comprises a dilator, the suction catheter is arranged separately from the dilator, and the dilator is detachably inserted into the suction catheter and extends outwards from the distal end of the dilator.

In an alternative embodiment, the distal end of the dilator comprises a tip structure provided with an annular groove for constraining the outer flare, in which the outer flare in the compressed state is housed.

Through setting up and get a bolt unit and inhale a bolt unit, can clear away the thrombus in the deep vein blood vessel with the form of mechanical thrombectomy, it is quick to take effect, can let the patient resume blood flow more swiftly, obtains blood perfusion as soon as possible.

The thrombus removal unit comprises an elastically scalable thrombus removal stent which can collect thrombus in a blood vessel in a dilated state and along with the withdrawal in a deep vein, and finally is cleared by suction through a flaring on a suction catheter in the thrombus removal unit.

The delivery assembly connected to the thrombus taking support can carry the thrombus taking support, deliver the thrombus to the far-end side of the thrombus in the deep vein, control the outward expansion of the thrombus taking support, and drive the thrombus taking support to withdraw from the deep vein, so that the thrombus on the near-end side of the thrombus taking support can be reliably collected in the withdrawing process.

The deformation of the embolectomy support is controlled through the conveying assembly, and the embolectomy support can be reliably switched between the expansion state and the contraction state, so that the conveying and the withdrawing of the embolectomy support are facilitated.

The outer flaring which can be elastically deformed is arranged at the far end of the suction catheter, so that the outer flaring and the thrombus taking support can be mutually matched, collected thrombus is sucked into the suction catheter through the outer flaring, and the thrombus is sucked and removed from a blood vessel.

Meanwhile, the outer flaring opening can be beneficial to the contracted thrombus taking support to pass through and be retracted into the suction catheter, so that the reliable removal of the thrombus taking device in the blood vessel is ensured.

The deep vein thrombus taking device can reliably collect thrombus in the deep vein, and thoroughly suck and remove the thrombus through the suction catheter, thereby effectively ensuring the treatment effect.

Additional features and advantages of the present application will be described in detail in the detailed description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic view of the present invention showing the construction of the embolectomy unit in an expanded state;

FIG. 2 is a schematic structural view of a transfer assembly of the present application;

FIG. 3 is a schematic view of the configuration of the aspiration catheter of the present application with the outer flare in a released condition;

FIG. 4 is a schematic structural view of the dilator of the present application;

FIG. 5 is a cross-sectional structural schematic view of a dilator tip of the present application;

FIG. 6 is a schematic structural view of the present embodiment of the tampon unit with the outer flare in an expanded state;

FIG. 7 is a schematic structural view of the present embodiment of the tampon unit with the outer flare in a contracted state;

FIG. 8 is a schematic structural view of a stop collar and a stop collar of the present application;

FIG. 9 is a schematic view of the connection location structure of the dense network segment and the sparse network segment in the present application;

FIG. 10 is a schematic diagram of the position relationship between the thrombus and the thrombus in the blood vessel in the present application;

FIG. 11 is a schematic view of the embolic unit of the present application after it has been expanded in a blood vessel;

fig. 12 is a schematic structural view of the embolectomy unit of the present application during intravascular withdrawal.

Icon:

a-a thrombus removal unit; 10-thrombus taking support; 11-compacting the web section; 12-sparse network segment; 13-a limit ring;

20-a delivery assembly; 20 a-an inner tube; 20 b-an intermediate tube; 20 c-an outer tube; 21-a marker block; 22-a limit check ring; 23-outer tube hemostatic valve; 24-a middle tube hemostatic valve; a 25-luer fitting; 26-a needle seat; 27-stainless steel tubing; 28-position markers;

b-a suction plug unit; 30-a suction catheter; 31-outer flaring; 32-a dilator; 33-suction catheter hemostasis valve; 34-a connector; 35-annular groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally 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 application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1-5 in combination with fig. 6-12, the deep vein thrombectomy device of the present application mainly performs mechanical clearing of thrombi in the deep vein, thereby reducing the drug usage and the risk of fatal cerebral hemorrhage compared to the prior forms of anticoagulation therapy and thrombolysis therapy.

The whole process of mechanical thrombus removal comprises two links, which mainly comprise thrombus collection and suction removal, and specifically are respectively carried out through a thrombus removal unit A and a thrombus suction unit B.

The embolectomy unit A comprises an elastically scalable embolectomy support 10 and a conveying assembly 20 connected with the embolectomy support 10, wherein the conveying assembly 20 is mainly used for carrying the embolectomy support 10 and controlling the transition between the expansion state and the contraction state.

The thrombus extraction unit B mainly comprises a suction catheter 30, the thrombus extraction support 10 and the delivery assembly 20 are connected in the suction catheter 30 in a penetrating manner, and the distal end of the suction catheter 30 is provided with an outer flaring opening 31 capable of elastic deformation.

In operation, the suction catheter 30 is firstly guided into the blood vessel under the guiding action of the guide wire, the outer flaring mouth 31 at the distal end of the suction catheter 30 is released to be flared through the dilator 32, and then the dilator 32 is withdrawn, so that the thrombus removing stent 10 in a compressed state enters the blood vessel through the suction catheter 30 under the driving of the delivery assembly 20.

After the thrombus taking stent 10 passes through an embolism position in a blood vessel, the thrombus taking stent 10 is expanded and expanded by controlling the conveying assembly 20, and thrombus in the blood vessel is collected in a drawing back mode after the thrombus taking stent 10 is completely released, so that the thrombus is collected and contained in the thrombus taking stent 10.

After the collection is finished, the thrombus is cut while the thrombus is elastically contracted by controlling the conveying assembly 20, the contracted thrombus taking support 10 is withdrawn into the suction catheter 30 through the outer flaring 31, and the thrombus at the position of the outer flaring 31 is sucked and removed through the suction device connected to the suction catheter 30.

According to the invention, the thrombus taking support 10 and the conveying assembly 20 are movably connected in the suction catheter 30 in a penetrating manner, so that the conveying and withdrawing of the thrombus taking support 10 can be facilitated, the collected and cut thrombus can be effectively removed through the suction catheter 30, the mechanical thrombus taking is realized, and the thrombus is efficiently and reliably removed.

In one embodiment, the embolectomy support 10 comprises a dense network segment 11 and a sparse network segment 12, the sparse network segment 12 is connected to the near end of the dense network segment 11 in a weaving mode, and the far end of the dense network segment 11 is connected with the far end of the conveying component 20.

Specifically, the thrombus removal support 10 comprises a near end and a far end, wherein the near end is a sparse network segment 12 with larger meshes, the far end is a dense mesh with smaller meshes, the dense network segment 11 is connected with the sparse network segment 12 in a weaving mode, and further, the far end of the sparse network segment 12 is connected with the near end of the dense network segment 11 in a weaving mode, so that the two network segments with different positions form an integral structure of the thrombus removal support 10.

The dense segment 11 is mainly used for collecting thrombus in a blood vessel in the process of withdrawing the thrombus stent 10, and the sparse segment 12 can cut large thrombus so that the thrombus can be sucked and removed more fully and thoroughly.

In this embodiment, the distal end of the dense segment 11 is connected to the distal end of the delivery assembly 20, and the thrombus-taking support 10 can be driven to move distally in the blood vessel by extending the delivery assembly 20, and the deformation amount of the thrombus-taking support 10 can be adjusted and the thrombus-taking support 10 can be controlled to switch between contraction and expansion by controlling the movement of different telescopic tubes in the delivery assembly 20.

In another embodiment, the conveying assembly 20 comprises an inner tube 20a, an intermediate tube 20b and an outer tube 20c which are nested inside and outside, the inner tube 20a, the intermediate tube 20b and the outer tube 20c can be moved and extended relatively, the distal end of the dense segment 11 is connected with the distal end of the inner tube 20a, and the distal end of the inner tube 20a is provided with a mark block 21.

The delivery assembly 20 controls the deformation of the thrombectomy stent 10 specifically by the inner tube 20a, the middle tube 20b and the outer tube 20c, which are capable of moving and extending relative to each other.

The thrombectomy stent 10 in the compressed state is received within the distal portion of the delivery assembly 20, specifically, within the annulus between the outer tube 20c and the inner tube 20 a. During delivery, the marker block 21 at the distal end of the inner tube 20a contacts the distal end of the outer tube 20c, and the tip portion of the thrombectomy stent 10 is nested in the distal end of the outer tube 20 c. The distal end of the inner tube 20a is maintained in a relatively fixed distance relationship with the distal end of the intermediate tube 20b within the outer tube 20c during delivery, preferably at a maximum spacing.

The proximal end of the sparse network segment 12 is connected to the distal end of the intermediate tube 20b, the distal end of the intermediate tube 20b is provided with a marker ring, the thrombectomy stent 10 in a compressed state is inserted into the aspiration catheter 30 after the dilator 32 is withdrawn in the aspiration catheter 30, and when the distal end of the inner tube 20a passes over the distal side of the thrombus in the blood vessel, the intermediate tube 20b is pushed while maintaining the maximum distance between the distal end of the inner tube 20a and the distal end of the intermediate tube 20b, so that the intermediate tube 20b extends distally relative to the outer tube 20c, and simultaneously the inner tube 20a and the thrombectomy stent 10 are driven to extend from the outer tube 20c, so that the thrombectomy stent 10 is released.

The inner tube 20a is penetrated in the embolectomy stent 10 and can movably stretch and contract relative to the embolectomy stent 10, after the embolectomy stent 10 is released in a blood vessel, based on the maximum distance between the far end of the inner tube 20a and the far end of the middle tube 20b, in order to enable the embolectomy stent 10 to be expanded and expanded integrally, the length of the two ends of the embolectomy stent 10 is reduced by fixing the position of the middle tube 20b and drawing back the inner tube 20a, and the embolectomy stent 10 is expanded and expanded integrally in a form similar to a lantern support by combining the elastically-retractable property of the embolectomy stent 10.

By means of the marking block 21 arranged at the distal end of the inner tube 20a and the marking ring at the distal end of the intermediate tube 20b, the change in length of the thrombectomy stent 10 can be observed under X-ray radiation for adjusting the specific amount of deformation of the thrombectomy stent 10.

In order to prevent the inner tube 20a from being excessively withdrawn to cause the expanded diameter of the compact segment 11 to be excessively large, the sparse segment 12 is connected with a limiting ring 13, the inner tube 20a penetrates through the limiting ring 13, and a limiting check ring 22 is fixedly sleeved on the inner tube 20a, furthermore, the limiting check ring 22 is arranged on the inner tube 20a and is positioned at the far end side of the limiting ring 13, and the inner tube 20a can be prevented from being withdrawn without limitation through the limiting ring 13 to block the limiting check ring 22 in the withdrawing process, so that the deformation quantity of the bolt support 10 can be effectively controlled.

The sparse network segment 12 in this embodiment can be expanded synchronously in the deformation process of the dense network segment 11 to form the collection of thrombus in the three-dimensional space. The maximum deformation of the whole embolectomy support 10 depends on the installation position of the limit stop ring 22 on the inner tube 20a, when the distance between the limit stop ring 22 and the far end of the inner tube 20a is larger, the movement of the inner tube 20a relative to the embolectomy support 10 is smaller, the maximum deformation is smaller, and otherwise, the maximum deformation is larger. The actual adjustment can be carried out according to the space of different blood vessel cavities during specific use, and the detailed description is omitted here.

When thrombus collection is completed and the thrombus stent 10 needs to be withdrawn, the distance between the distal end of the thrombus stent 10 and the distal end of the intermediate tube 20b can be enlarged by fixing the intermediate tube 20b and pushing the inner tube 20a at the same time, so that the thrombus stent 10 returns to a compressed state, thereby facilitating the withdrawal on the outer flaring 31 into the suction catheter 30.

The outer tube 20c is specifically sleeved outside the middle tube 20b, the proximal end of the outer tube 20c is connected with an outer tube hemostatic valve 23 with a lateral branch, the proximal end of the middle tube 20b is connected with a middle tube hemostatic valve 24 with a lateral branch, the middle tube 20b extends into the outer tube 20c from the outer tube hemostatic valve 23, the inner tube 20a extends into the middle tube 20b from the middle tube hemostatic valve 24, and the proximal end of the inner tube 20a is connected with a needle seat 26.

A luer 25 is provided between the outer tube hemostatic valve 23 and the middle tube hemostatic valve 24, and the two are connected by the luer 25, so that the position of the middle tube 20b relative to the outer tube 20c can be fixed.

Based on the above-mentioned operation of pushing the middle tube 20b to extend the distal end of the middle tube 20b from the distal end of the outer tube 20c and releasing the thrombectomy stent 10 while keeping the distal end of the inner tube 20a and the distal end of the middle tube 20b at a fixed distance, the luer 25 can also play a role in positioning, and in the compressed state of the thrombectomy stent 10, the middle tube 20b is arranged between the outer tube hemostatic valve 23 and the middle tube hemostatic valve 24 with a certain length, and the luer 25 is sleeved on the middle tube 20 b. When the middle pushing tube 20b is connected with the luer 25, the distal end of the middle pushing tube 20b extends out of the distal end of the outer tube 20c, the middle tube hemostatic valve 24 and the outer tube hemostatic valve 23 are connected through the luer 25, the relative positions of the middle pushing tube 20b and the outer tube 20c can be fixed, and the whole deformation of the embolus stent 10 can be controlled by adjusting the expansion amount of the inner tube 20 a.

The middle tube hemostatic valve 24 in this embodiment includes a locking type hemostatic valve, the needle seat 26 at the proximal end of the inner tube 20a is connected to a stainless steel tube 27, the stainless steel tube 27 is fixedly sleeved at the proximal end of the inner tube 20a and is inserted into the middle tube hemostatic valve 24, the distal end of the inner tube 20a retracts relative to the distal end of the middle tube 20b to expand the thrombus removal stent 10 in response to the above-mentioned retracting of the inner tube 20a, and after the thrombus removal stent is expanded to the proper position, the inner tube 20a is locked by the middle tube hemostatic valve 24 to fix the position of the inner tube 20a, so as to maintain the reliable deformation of the thrombus removal stent 10.

The stainless steel tube 27 fixedly sleeved on the inner tube 20a can prevent the middle tube hemostatic valve 24 from compressing and deforming the inner tube 20a, and ensure that the guide wire penetrating in the inner tube 20a can movably stretch and retract while avoiding the structure of the inner tube 20a from being influenced. The position mark 28 arranged on the stainless steel tube 27 can provide a basis for the relative position of the inner tube 20a relative to the middle tube 20b, and the relative position relationship between the two can be conveniently acquired outside the body, thereby being beneficial to controlling and adjusting the deformation amount of the thrombus removal support 10.

Before use, the space between the outer tube 20c and the middle tube 20b and the space between the middle tube 20b and the inner tube 20a are filled with the side branch of the outer tube hemostatic valve 23 and the side branch of the middle tube hemostatic valve 24, and air is removed while the cavity is flushed.

In another specific embodiment, the proximal end of the suction catheter 30 is connected with a suction catheter hemostasis valve 33, the suction catheter hemostasis valve 33 comprises a side branch, the proximal end of the side branch is provided with a connector 34, the connector 34 is connected with an aspirator (not shown in the figure) for providing suction negative pressure, and the negative pressure provided by the aspirator can suck and remove thrombus cut during the contraction process of the collecting and thrombus removing stent 10 while withdrawing the thrombus removing stent 10, so that the removal effect is ensured by the thrombus with smaller size.

Connect the outer flaring 31 of suction catheter 30 in this application, can effectively shutoff the vascular cavity of dark vein, reduce the annular space of outer flaring 31 and vascular wall on the suction catheter 30, can fully thoroughly aspirate the thrombus near outer flaring 31 and clear away.

Also used in cooperation with the suction catheter 30 is a dilator 32, the suction catheter 30 is separated from the dilator 32, the dilator 32 is detachably inserted into the suction catheter 30 and extends outward from the distal end of the suction catheter 30, the dilator 32 is mainly used for elastically deforming the outer flaring 31 and binding the outer flaring 31 during the process of conveying the suction catheter 30, so that the tip of the suction unit can normally enter the deep vein.

In particular, the distal end of dilator 32 includes a tip structure to facilitate passage of the aspiration unit within the blood vessel. The tip structure is provided with an annular groove 35 for binding the outer flaring 31, the outer flaring 31 in a compressed state is accommodated in the annular groove 35, and after the suction catheter 30 reaches a target position under the guiding action of the guide wire, the expander 32 is pushed to separate the expander from the suction catheter 30, and the outer flaring 31 is separated from the binding of the annular groove 35 to realize expansion.

The material of outer flaring 31 is nickel titanium memory alloy, and in taking the withdrawal of taking out back suction catheter 30 of accomplishing, based on outer flaring 31 can elastic deformation, can make it freely contract in the constraint of blood vessel chamber, directly withdraws, has guaranteed the reliable of withdrawing the operation and has gone on.

According to the deep vein thrombus taking device, the outer flaring port 31 of the suction catheter 30 is contracted and laid in the dilator 32, the suction catheter 30 is firstly inserted into a deep vein along a preset guide wire, the dilator 32 is pushed to release the outer flaring port 31 at the far end of the suction catheter 30, the dilator 32 is withdrawn, the delivery assembly 20 carries the thrombus taking stent 10 in a compressed state, the delivery assembly 20 and the thrombus taking stent 10 are led into a blood vessel along the guide wire through the suction catheter hemostatic valve 33 at the near end of the suction catheter 30 and pass through a thrombus part in the blood vessel, the middle tube 20b is pushed until the middle tube hemostatic valve 24 is connected with the outer tube hemostatic valve 23 through the luer connector 25, the stent is released, the position of the inner tube 20a is adjusted, the mark on the stainless steel tube 27 at the near end of the inner tube 20a is flush with the middle tube hemostatic valve 24, and the hemostatic valve is locked, and at this time, the thrombus taking stent 10 is in a fully expanded state.

When the thrombus taking support 10 is moved towards the near end in the completely expanded state, thrombus in the blood vessel is collected and intercepted in the inner cavity of the thrombus taking support 10, when the near end of the thrombus taking support 10 reaches the far end of the outer flaring 31, the middle tube 20b is withdrawn, after the near end of the thrombus taking support 10 is observed to enter the suction catheter 30 under the X-ray, the inner tube 20a is pushed, the needle head at the near end of the inner tube 20a is flush with the middle tube hemostatic valve 24, the operation is that the thrombus taking support 10 can be contracted, the expansion caused by withdrawing the sparse net section 12 and the dense net section 11 is prevented, the thrombus taking unit A cannot be withdrawn into the suction catheter 30, and the thrombus taking support 10 and the conveying assembly 20 are withdrawn out of the suction catheter 30.

And (3) when the thrombus removal unit A is withdrawn, carrying out negative pressure suction on the side branch of the suction catheter hemostasis valve 33, sucking out the thrombus near the outer flaring opening 31 at the far end of the suction catheter 30, and finally withdrawing the suction catheter 30 out of the body to finish the operation.

The deep vein thrombosis removing device effectively solves the problems that the deep vein revascularization operation is multiple in instruments, operators are complex, and thrombus escapes during thrombosis removing operation to cause pulmonary embolism to endanger life.

The hemostatic valves arranged at the near ends of the outer tube 20c and the middle tube 20b can effectively prevent blood leakage among the inner tube 20a, the middle tube 20b and the outer tube 20c, the locking type hemostatic valve arranged at the near end of the middle tube 20b can be locked with the inner tube 20a, the inner tube 20a is prevented from freely moving in the middle tube 20b, and therefore stable forming of the embolectomy support 10 cannot be guaranteed, control over the deformation state of the embolectomy support 10 is effectively achieved, the stainless steel tube 27 with the position mark 28 arranged at the near end of the inner tube 20a effectively avoids compression deformation of the inner tube 20a, meanwhile, pushing is facilitated, the relative positions of the inner tube 20a and the middle tube 20b can be rapidly and directly known, and the deformation state of the embolectomy support 10 can be controlled more intuitively and accurately.

It is important to point out that the mechanical thrombus removal process can be completed by the mutual matching of the thrombus removal unit A and the thrombus absorption unit B, and the mechanical thrombus removal device is simple to operate and convenient and fast to use.

The dense network segment 11 can prevent thrombus from escaping to block pulmonary artery blood vessels, so that the possibility of pulmonary embolism is avoided, the sparse network segment 12 is convenient for thrombus collection and cutting, and the thrombus clearing effect is effectively ensured.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A deep vein thrombus taking device is characterized by comprising a thrombus taking unit and a thrombus suction unit;

the thrombus removal unit comprises a thrombus removal support capable of elastically contracting and expanding, and a conveying assembly connected with the thrombus removal support and used for carrying the thrombus removal support and controlling the thrombus removal support to expand and contract;

2. The deep vein embolectomy device of claim 1, wherein the embolectomy support comprises a dense network segment and a sparse network segment, the sparse network segment is connected with a near end of the dense network segment in a weaving mode, and a far end of the dense network segment is connected with a far end of the conveying assembly.

3. The deep vein thrombectomy device according to claim 2, wherein the delivery assembly comprises an inner tube, an intermediate tube and an outer tube which are nested inside and outside, the inner tube, the intermediate tube and the outer tube can be moved and extended and retracted relatively, the distal end of the dense network segment is connected with the distal end of the inner tube, and a marker block is arranged on the distal end of the inner tube.

4. The deep vein embolectomy device of claim 3, wherein the proximal end of the sparse network segment is connected to the distal end of the middle tube, the distal end of the middle tube is provided with a marker ring, and the embolectomy stent in a compressed state is accommodated in an annular space between the inner tube and the outer tube.

5. The deep vein embolectomy device of claim 3, wherein the inner tube is threaded in the embolectomy bracket and can movably extend and contract relative to the embolectomy bracket for adjusting the deformation amount of the embolectomy bracket;

6. The deep vein embolectomy device of claim 3, wherein an outer tube hemostatic valve is connected to a proximal end of the outer tube, a middle tube hemostatic valve is connected to a proximal end of the middle tube, the middle tube extends into the outer tube from the outer tube hemostatic valve, and a luer connector is arranged between the outer tube hemostatic valve and the middle tube hemostatic valve and is sleeved on the middle tube.

7. The deep vein embolectomy device of claim 6, wherein a needle seat is connected to the proximal end of the inner tube, a stainless steel tube is connected to the needle seat, position marks are arranged on the stainless steel tube, the inner tube extends into the middle tube from the middle tube hemostatic valve, and the stainless steel tube is sleeved at the proximal end of the inner tube and is inserted into the middle tube hemostatic valve.

8. The deep vein embolectomy device of any of claims 1-7, wherein the proximal end of the suction catheter is connected with a suction catheter hemostasis valve, the suction catheter hemostasis valve comprises a side branch, the proximal end of the side branch is provided with a connector, and the connector is connected with an aspirator for providing suction negative pressure.

9. The deep vein embolectomy device of any of claims 1-7, wherein the embolectomy unit further comprises a dilator, the aspiration catheter is arranged separately from the dilator, and the dilator is detachably inserted into the aspiration catheter and extends outward from the distal end thereof.

10. A deep vein embolectomy device according to claim 9, wherein the distal end of the dilator comprises a tip structure provided with an annular groove for constraining the outer flare, the outer flare in a compressed state being received in the annular groove.