Thrombus removing device

Abstract

The utility model relates to the technical field of medical instruments, in particular to a thrombus removing device. The utility model provides a thrombus removing device which comprises an outer tube and an expandable balloon arranged at the far end of the outer tube, and the balloon can block blood vessels after being expanded. The device further comprises an inner pipe and a screw rod. The inner pipe is arranged in the outer pipe and can relatively move in the axial direction, the far end of the inner pipe is a net pipe capable of expanding automatically, and the net pipe is in a funnel shape after expanding automatically; and the screw rod can enter the inner pipe and can relatively move in the axial direction. The technical problem that in the prior art, thrombus cannot be removed thoroughly is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of medical apparatus and instruments, in particular to a thrombus removing device. BACKGROUND

[0002] At present, there are mainly drug thrombolysis and mechanical thrombectomy, and current drug thrombolysis is still one of the main treatment methods, but drug thrombolysis has obvious defects, and mechanical thrombectomy has become a future treatment trend. Mechanical thrombectomy mainly includes three mainstream methods: stent thrombectomy, direct suction thrombectomy and stent suction combined treatment. The core products involved are mainly thrombectomy stents and suction catheters, and negative pressure suction pumps. Among them, the stent thrombectomy is through the self-expanding of the stent to cut the thrombus, inlay the thrombus and pull out the thrombus, so as to safely and effectively remove the intracranial thrombus and restore the cerebral blood flow. The suction catheter is used to suck out the thrombus in the blood vessel by negative pressure. The stent suction combined treatment is used in cooperation with the stent thrombectomy and the suction catheter, the stent thrombectomy is used first, when the stent and the suction catheter are close, the negative pressure suction is started, and the thrombus is removed by pulling the stent. The above methods have good effects in clinical practice, and the recanalization rate can reach about 80%, but each method has more or less direct defects, such as thrombus escape in stent thrombectomy, blood vessel injury, incomplete thrombus removal in suction thrombectomy, and poor effect of hard thrombus.

[0003] A blood vessel surgery thrombus suction device is disclosed in Chinese Utility Model Patent No. CN213822826U on July 30, 2021. The blood vessel surgery thrombus suction device includes a mounting cylinder, a suction mechanism, a negative pressure mechanism and a driving mechanism. The suction mechanism is installed on the mounting cylinder. The suction mechanism includes a handle, a suction pipe, a suction cavity and a spiral breaking rod. The handle is fixedly installed on the mounting cylinder, and the suction pipe is fixedly installed on the end of the handle away from the mounting cylinder. The suction cavity is opened in the handle and is in communication with the suction pipe. The spiral breaking rod is installed in the suction pipe. The negative pressure mechanism is installed in the mounting cylinder. The driving mechanism is installed in the mounting cylinder. However, this scheme does not have a blocking device, and the thrombus may escape during the suction process.

[0004] A novel thrombus suction balloon catheter is disclosed in Chinese Utility Model Patent No. CN219645824U on September 8, 2023, which relates to the field of medical supplies and includes a thrombus suction balloon catheter. The thrombus suction balloon catheter has a thrombus suction lumen inside and a balloon outside. The outer wall of the thrombus suction balloon catheter is provided with a balloon filling lumen. Although this scheme forms a blocking at the proximal end to prevent thrombus escape, if the thrombus is large and hard, the suction port of the catheter cannot smoothly suck the thrombus.

[0005] Therefore, it is necessary to provide a thrombus removing device which can prevent thrombus from escaping and improve the ability of removing thrombus. SUMMARY

[0006] The thrombus removing device aims to solve the technical problem of incomplete thrombus removal in the prior art.

[0007] To achieve the above object, the utility model provides a thrombus removing device, including the outer tube and setting on the distal end of the outer tube the expandable balloon, the balloon can block the blood vessel after expansion, still include the inner tube and screw rod, the inner tube sets up in the outer tube and can move relatively in the axial direction, the distal end of the inner tube is the net tube that can self -expand, the net tube is funnel -shaped after self -expanding, the screw rod can enter the inner tube and can move relatively in the axial direction.

[0008] As preferable, the screw rod includes a shaft-like pull rod and a spiral piece provided at the distal end of the shaft-like pull rod.

[0009] As preferable, the proximal end of the outer tube is connected with an outer tube joint, a small channel joint is connected on the outer tube joint, and a small channel is provided on the outer tube; the gas entering the small channel joint enters the balloon through the small channel to expand the balloon.

[0010] As preferable, the balloon closely adheres to the outer wall of the outer tube when no gas enters, and the balloon can block the blood vessel after expansion.

[0011] As preferable, the inner tube passes through the outer tube joint, and a locking device is further provided on the outer tube joint.

[0012] As preferable, the locking device includes a valve body, an O-ring, and a valve cover; the valve body is provided with a through hole, the O-ring is provided in the through hole, the valve cover is threadedly connected on the valve body, and the inner tube passes through the hole of the O-ring; during the screwing of the valve cover, the valve cover radially extrudes the O-ring.

[0013] As preferable, a mandrel is provided on the valve cover, and the mandrel moves axially along the through hole; during the screwing of the valve cover, the mandrel extrudes the O-ring.

[0014] As preferable, the distal end of the valve body is provided with a radially outwardly extending baffle, the distal end of the valve cover is provided with a radially inwardly extending limiting piece, the limiting piece is provided at the distal end of the baffle, and the opening of the proximal end of the valve cover is in the shape of a horn mouth.

[0015] As preferable, the through hole gradually increases from the distal end to the proximal end; and the O-ring is made of flexible elastic material.

[0016] As preferred, the proximal end of the inner tube is connected with an inner tube joint, which is used to connect the negative pressure source and the entering of the screw rod.

[0017] As preferred, the inner tube joint is provided with a negative pressure source connector and an entering rod head, which can be sealed when not in use.

[0018] Compared with the prior art, the thrombus removing device has the beneficial effects that:

[0019] 1. The gas bag can block the proximal end of the blood vessel, so that the negative pressure of the suction process can be effectively transmitted to the thrombus at the distal end of the blood vessel, preventing the thrombus from escaping during the suction process. The distal end of the inner tube uses a self-expanding funnel-shaped mesh tube, so that the area of the suction port is larger and the suction effect is better.

[0020] 2. The inner tube and the outer tube can be fixed during transportation, facilitating transportation together, and can be unlocked and fixed when reaching the specified position, facilitating the withdrawal of the outer tube to release the inner tube, and the operation is more convenient.

[0021] 3. The screw rod is used to dredge the relatively hard blood vessels in the blood vessels to facilitate suction, and can also be used to dredge the blockage of the inner tube.

[0022] The features and advantages of the present application will be described in detail with reference to the embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structure schematic view of the inner tube release in the thrombus removing device of the embodiment of the present application.

[0024] Figure 2 is a structure schematic view of the inner tube transportation in the thrombus removing device of the embodiment of the present application.

[0025] Figure 3 is an enlarged structure schematic view of A in the present application.

[0026] Figure 4 is a structure schematic view of the screw rod of the present application.

[0027] Figure 5 is another structure schematic view of the inner tube joint of the present application.

[0028] Figure 6 is a structure schematic view of the locking device of the present application without locking.

[0029] Figure 7 is a structure schematic view of the locking device of the present application with locking.

[0030] Figure 8 is a structure schematic view of another valve body of the locking device of the present application.

[0031] wherein:

[0032] 1-outer tube; 11-small channel; 2-balloon; 3-inner tube; 31-net tube; 4-screw rod; 41-axle pull rod; 42-spiral piece; 5-outer tube connector; 6-small channel connector; 7-locking device; 71-valve body; 711-through hole; 712-flap; 72-O-ring; 73-valve cover; 731-core shaft; 732-limiting piece; 8-inner tube connector; 81-negative pressure source connector; 82-rod head. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0034] In the description of the present application, it should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] In the description of the present application, it should be noted that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0036] In the description of the utility model, still need explaining, unless another explicit provision and limitation, term "arrange", "install", "link", "connect" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through intermediate medium indirectly connect, can be two element inside the intercommunication。For ordinary skilled person in the art, can understand the specific meaning of above-mentioned term in the application according to specific circumstances.

[0037] As used herein, the term "clinician" refers to a physician, surgeon, nurse, or any other care provider, and can include ancillary staff. The term "proximal" will refer to the portion of the device or component thereof closer to the clinician, and the term "distal" will refer to the portion of the device or component thereof further from the clinician.

[0038] Referring to Figures 1-4 The utility model discloses a kind of thrombectomy devices, including outer tube 1 and the expandable balloon 2 on the distal end of outer tube 1, the balloon 2 can be blocked after expansion blood vessel. Thrombectomy device further includes inner tube 3 and screw rod 4;The inner tube 3 is arranged in outer tube 1 and can be relatively moved in axial direction, the distal end of the inner tube 3 is self-expandable mesh tube 31, the mesh tube 31 is funnel-shaped after self-expansion;Screw rod 4 can enter the inner tube 3 and can be relatively moved in axial direction. The balloon 2 is tightly attached to the outer wall of the outer tube 1 when not gas, the balloon 2 can be blocked after expansion blood vessel.

[0039] Specifically, in the delivery state as shown in Figure 2 And 3 Balloon 2 is not inflated, and balloon 2 is tightly attached to the outer wall of the outer tube 1. The distal end of the inner tube 3 is completely housed inside the outer tube 1. This structure is convenient for delivery in the sheath. In the release state for absorbing thrombus, as shown in Figure 1 Balloon 2 is inflated and expanded, and the proximal end is blocked. The self-expanding mesh tube 31 is exposed outside the outer tube 1 and self-expands to be funnel-shaped, with a larger suction port, making it easier to suck in thrombus. It prevents thrombus from being difficult to suck in between balloon 2 and self-expanding mesh tube 31 during the suction process.

[0040] Referring to Figure 4In an alternative embodiment, the screw rod 4 comprises a shaft-like pull rod 41 and a screw blade 42 arranged at the distal end of the shaft-like pull rod 41. When the thrombus is aspirated, if the thrombus is too much to cause the inner tube 3 to be blocked, the screw rod 4 is extended into the inner tube, moved to the distal end while rotating, dredges the inner tube, and in the process of pulling back, the thrombus can be taken out to prevent re-blocking. At the same time, in the process of use, if the thrombus in the blood vessel is hard and cannot be aspirated into the thrombus, the screw blade 42 reaches the position of the hard thrombus, the screw rod 4 is rotated, and the thrombus is pulled back to break the thrombus and take back the thrombus, which is more conducive to the aspiration of the catheter.

[0041] Referring to Figures 2-3 In an alternative embodiment, the proximal end of the outer tube 1 is connected with an outer tube connector 5, the outer tube connector 5 is connected with a small channel connector 6, and the outer tube 1 is provided with a small channel 11. The gas entering the small channel connector 6 enters the balloon 2 through the small channel 11 to expand the balloon 2. The small channel connector 6 can be connected with a syringe or an inflation pump. After inflation, the gas enters the balloon 2 along the small channel 11 and expands to block the proximal end of the blood vessel, temporarily isolating the blood flow to prevent the blood flow from pushing the thrombus to the distal end during the aspiration process.

[0042] In an alternative embodiment, the inner tube 3 passes through the outer tube connector 5, and the outer tube connector 5 is further provided with a locking device 7. When the locking device 7 is locked, it is convenient to transport the inner tube and the outer tube together to the designated position. If the inner tube and the outer tube are not fixed, the distal end of the inner tube will expand in the blood vessel after the distal end of the inner tube is separated from the outer tube during the transportation process, increasing the difficulty of transportation to the distal end.

[0043] Referring to Figures 6-7 In an alternative embodiment, the locking device 7 comprises a valve body 71, an O-ring 72, and a valve cover 73. The valve body 71 is provided with a through hole 711, the through hole 711 is provided with an O-ring 72, the valve body 71 is threadedly connected with a valve cover 73, and the inner tube 3 passes through the hole of the O-ring 72. During the screwing process of the valve cover 73, the valve cover 73 radially extrudes the O-ring 72.

[0044] Specifically, the clamping jaw of the valve body 71 is similar to the clamping jaw of the cable connector. When the valve cover 73 is tightened, the distance between the clamping jaws becomes smaller, i.e., moves to the center line direction, causing the through hole 711 to gradually become smaller, gradually extruding the O-ring 72, and the inner diameter and the outer diameter of the O-ring 72 will become smaller. The O-ring fixes the inner tube, keeping the inner tube and the outer tube stationary.

[0045] Referring to Figures 6-7In an alternative embodiment, a mandrel 731 is provided on the valve cover 73, which is axially moved along the through hole 711; during the screwing of the valve cover 73, the mandrel 731 presses the O-ring 72. During the screwing, the mandrel 731 is moved in the direction close to the O-ring 72, preventing the O-ring 72 from being dislocated.

[0046] Referring to Figures 6-7 In an alternative embodiment, the distal end of the valve body 71 is provided with a radial outwardly extending baffle 712, and the distal end of the valve cover 73 is provided with a radial inwardly extending limiting piece 732, which is arranged at the distal end of the baffle 712, preventing the valve cover 73 from falling off in the unscrewed state. The opening at the proximal end of the valve cover 73 is in the shape of a trumpet mouth, facilitating the entry of the inner tube therefrom.

[0047] In an alternative embodiment, the O-ring 72 is made of flexible elastic material, which can be silicone, rubber or any other flexible elastic material. Since the inner tube 3 is moved in the outer tube 1, the fixing force does not need to be very large, and the friction force when the elastic material is compressed is sufficient, and the elastic material will not wear the inner tube.

[0048] The inner diameter of the valve body 71 of the locking device 7 has two types. The inner diameter can be constant or gradually changing, and the inner diameter is constant as shown in Figures 6-7 When the inner diameter is gradually changing as shown in Figure 8 , the through hole 711 gradually increases from the distal end to the proximal end, and when the valve cover 73 is screwed, the O-ring 72 slowly moves to the distal end, being slowly compressed, and the compression effect is better. In order to prevent the O-ring from tilting, the distal end of the O-ring 72 can be provided with an inclined surface for matching the inner diameter of the valve body 71.

[0049] In an alternative embodiment, the proximal end of the inner tube 3 is connected with an inner tube connector 8, which is used for connecting the negative pressure source and the entry of the screw rod 4. The negative pressure source connection port and the screw rod 4 entry port can be at the same position or different positions. When they are at the same position as shown in Figures 1-2 , the suction and the screw rod cannot be used at the same time. In an alternative embodiment, the negative pressure source connection port and the screw rod 4 entry port are at different positions as shown in Figure 5 , the inner tube connector 8 is provided with a negative pressure source connector 81 and an entry rod head 82, and the entry rod head 82 is arranged at the proximal end of the inner tube connector 8, so that the screw rod can be straightly in and out, facilitating the use. The entry rod head 82 can be sealed when not in use, preventing the suction effect from being poor. During the use of the screw rod, a rubber sealing cover can also be used to maintain the sealing, enabling the suction to be performed at the same time as the use of the screw rod.

[0050] The specific use process is as follows:

[0051] The clinician inserts the inner tube from the inner tube connector into the outer tube, the distal end of the inner tube and the distal end of the outer tube are flush, and the inner tube and the outer tube are fixed by the locking device. After the clinician delivers the sheath tube to the position where the thrombus needs to be extracted, the inner tube and the outer tube fixed together are delivered to the position close to the thrombus through the sheath tube.

[0052] Firstly, the sheath tube is withdrawn, and the balloon is inflated to block the proximal blood vessel by injecting air into the small channel connector. Then, the locking device is loosened, and the outer tube is withdrawn. After the mesh tube at the distal end of the inner tube is completely exposed from the outer tube, it is self-expanded into a trumpet. Suction is performed through the inner tube connector connected to the negative pressure source connector. During the suction process, the funnel-shaped self-expanding mesh tube at the distal end of the inner tube prevents the thrombus from escaping proximally. If the thrombus block moves to the proximal end of the self-expanding mesh tube, it is difficult to suck. The balloon of the outer tube blocks the blood flow to prevent the thrombus from being washed away. If a hard thrombus is encountered, the inner tube is blocked, the negative pressure source is closed, the screw rod is used along the inner tube to the blocked position, the screw rod is rotated to pass through the blocked thrombus position, the screw rod is pulled back to remove the blocked thrombus, and the blocked tube is removed. At the same time, during use, if a hard thrombus is encountered, suction cannot move the thrombus, at which time the screw shaft can be used to reach the position of the hard thrombus, the screw rod is rotated, the thrombus is pulled back, the thrombus is broken, and the thrombus is brought back, which is more conducive to the suction of the suction catheter.

[0053] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A thrombectomy device comprising an outer tube (1) and an expandable balloon (2) arranged on a distal end of the outer tube (1), the balloon (2) being capable of occluding a blood vessel when expanded; characterized in that: It also comprises an inner tube (3) and a screw rod (4); the inner tube (3) is arranged in the outer tube (1) and can move relatively in the axial direction, the distal end of the inner tube (3) is a self-expandable mesh tube (31), the mesh tube (31) is funnel-shaped after self-expansion; the screw rod (4) can enter the inner tube (3) and can move relatively in the axial direction.

2. The thrombectomy device of claim 1, wherein: The screw rod (4) comprises a shaft-shaped pull rod (41) and a spiral piece (42) arranged at the distal end of the shaft-shaped pull rod (41).

3. The thrombectomy device of claim 1, wherein: The proximal end of the outer tube (1) is connected with an outer tube connector (5), a small channel connector (6) is connected on the outer tube connector (5), and a small channel (11) is arranged on the outer tube (1); the gas entering the small channel connector (6) enters the balloon (2) through the small channel (11) to make the balloon (2) expand.

4. The thrombectomy device of claim 1, wherein: The balloon (2) is tightly attached to the outer wall of the outer tube (1) when no gas is introduced, and the balloon (2) can block the blood vessel after expansion.

5. The thrombectomy device of claim 3, wherein: The inner tube (3) passes through the outer tube connector (5), and the outer tube connector (5) is further provided with a locking device (7).

6. A thrombectomy device as in claim 5, wherein: The locking device (7) comprises a valve body (71), an O-ring (72) and a valve cover (73); the valve body (71) is provided with a through hole (711), the through hole (711) is provided with an O-ring (72), the valve body (71) is threadedly connected with a valve cover (73), and the inner tube (3) passes through the hole of the O-ring (72); during the screwing of the valve cover (73), the valve cover (73) radially extrudes the O-ring (72).

7. The thrombectomy device of claim 6, wherein: The valve cover (73) is provided with a mandrel (731) which moves axially along the through hole (711); during the screwing of the valve cover (73), the mandrel (731) extrudes the O-ring (72).

8. The thrombectomy device of claim 7, wherein: The distal end of the valve body (71) is provided with a radially outwardly extending baffle (712), the distal end of the valve cover (73) is provided with a radially inwardly extending limiting piece (732), and the limiting piece (732) is arranged at the distal end of the baffle (712); the opening at the proximal end of the valve cover (73) is trumpet-shaped.

9. The thrombectomy device of claim 6, wherein: The through hole (711) gradually increases from the distal end to the proximal end; the O-ring (72) is made of flexible elastic material.

10. The thrombectomy device of claim 1, wherein: The proximal end of the inner tube (3) is connected with an inner tube connector (8), the inner tube connector (8) is used for connecting a negative pressure source and the entering of the screw rod (4); the inner tube connector (8) is provided with a negative pressure source connector (81) and a rod head (82), and the rod head (82) can be sealed when not in use.

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