Suction device, suction assembly and thrombectomy system

Abstract

The utility model relates to an aspirator, an aspiration assembly and a thrombectomy system. The aspirator comprises a sleeve, a limiting piece, a piston rod and a piston ring, and the sleeve is provided with an aspiration cavity and an aspiration nozzle; the limiting piece is provided with a limiting part, the limiting piece is connected with the side wall of the sleeve, and at least part of the limiting part penetrates through the side wall of the sleeve to extend into the suction cavity; the piston rod is movably contained in the suction cavity and can move in the axial direction and rotate in the circumferential direction of the sleeve, the piston rod comprises a rod body, a limiting piece and a supporting piece, the limiting piece is connected with the rod body and used for being matched with the limiting part to limit the piston rod, the supporting piece is connected with the rod body, and the supporting piece abuts against the side face of the side, away from the suction nozzle, of the limiting piece; the limiting piece is supported; the piston ring is connected with the end, close to the suction nozzle, of the rod body, is connected with the inner side wall of the suction cavity in a sealed mode and can synchronously and axially move along with the rod body so that the suction cavity can be in a negative pressure state or restore to a natural state. The negative pressure suction device is good in negative pressure effect.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and in particular to an aspirator, a suction component and a thrombus removal system. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Thrombosis is a major factor endangering human health. Thrombosis includes arterial thrombosis and venous thrombosis.

[0004] At present, interventional treatment with thrombectomy devices has become an effective and important treatment method for thromboembolism. During the interventional treatment with thrombectomy devices, the thrombus is brought into the delivery sheath through the thrombectomy device and withdrawn with the delivery sheath, while the small thrombi, free small thrombi and newly generated thrombi generated by the thrombectomy device during the thrombectomy process can be removed by the suction component.

[0005] The suction assembly usually includes an aspirator, a hose, a liquid-stopping clamp mounted on the hose, and a joint connecting the hose and the aspirator. Before the suction assembly is used, the hose is closed by the liquid-stopping clamp, and then the piston rod of the aspirator is pulled outward to form a negative pressure in the aspirator. When the liquid-stopping clamp is opened, the thrombus can be directly aspirated. Therefore, in order to maintain the negative pressure environment in the aspirator, the piston rod needs to be limited by a fixed structure. However, the existing fixed structure is prone to deformation, which causes the piston rod of the aspirator to slip, resulting in an inability to form an effective negative pressure in the aspirator. Utility Model Content

[0006] Based on this, it is necessary to provide a suction device with better negative pressure effect.

[0007] Furthermore, a suction component with better negative pressure effect is provided.

[0008] Furthermore, a thrombus removal system with better negative pressure effect is also provided.

[0009] A suction device, comprising:

[0010] A sleeve having a suction chamber and a suction nozzle;

[0011] A limiting member having a limiting portion, wherein the limiting member is connected to the side wall of the sleeve, and the limiting portion at least partially passes through the side wall of the sleeve and extends into the suction chamber;

[0012] A piston rod is movably accommodated in the suction chamber and is capable of axial movement and circumferential rotation along the sleeve, wherein the piston rod comprises: a rod body, a limiting plate and a supporting member, wherein the limiting plate is connected to the rod body and is used to cooperate with the limiting portion to limit the piston rod, and the supporting member is connected to the rod body, and the supporting member abuts against a side surface of the limiting plate away from the suction nozzle to support the limiting plate; and

[0013] The piston ring is connected to one end of the rod body close to the suction nozzle, and the piston ring is sealed to the inner wall of the suction chamber, and can synchronously move axially with the rod body to put the suction chamber in a negative pressure state or restore it to a natural state.

[0014] In one of the embodiments, the limiting plate is inclined toward the end where the suction nozzle is located, so that the angle θ between the limiting plate and the rod body is greater than or equal to 30 degrees and less than 90 degrees.

[0015] In one of the embodiments, there are multiple limit plates, and the limit plates are spaced apart along the axial direction of the rod body, and the limit portion can cooperate with one of the limit plates to provide multiple negative pressure states with different pressures in the suction chambers; there are multiple support members, and the multiple support members correspond one-to-one to the multiple limit plates, or there are multiple support members, the number of which is less than the number of limit plates, and the limit plate located at the nearest end is not provided with a corresponding support member.

[0016] In one embodiment, the rod body includes: a mounting end, a push-pull end and a plurality of connecting plates connecting the mounting end and the push-pull end; the piston ring is sleeved on the mounting end, each of the connecting plates extends along the axial direction of the sleeve, and a side edge of each of the connecting plates extending along the axial direction converges on the axis of the sleeve and is connected to the side edges of other connecting plates; the limiting plate is located between two adjacent connecting plates and is connected to one of the connecting plates.

[0017] In one embodiment, there are multiple limiting plates, and the limiting plates are spaced apart and distributed along the axial direction of the connecting plate;

[0018] Each of the limiting plates is fixed on the surface of one of the two adjacent connecting plates, and a gap is formed between the limiting plate and the other of the two adjacent connecting plates; or,

[0019] Each of the limiting plates is connected to two adjacent connecting plates, and one of the connecting plates is provided with a plurality of avoiding openings. In the axial direction, each avoiding opening is located between two adjacent limiting plates.

[0020] In one embodiment, an axially extending side edge of each of the plurality of connecting plates converges on the axis of the sleeve and is connected to form at least two first installation spaces and at least two second installation spaces, and the at least two first installation spaces and at least two second installation spaces are alternately arranged in the circumferential direction, two adjacent connecting plates enclose the first installation space, and two adjacent connecting plates enclose the second installation space, and the first installation space and the second installation space share a connecting plate, in the first installation space, a plurality of axially spaced limiting plates are arranged on the side surface of the common connecting plate; in the second installation space, a limiting plate is arranged on the other side opposite to the common connecting plate, and the limiting plate is located at the far end of the common connecting plate; and a first avoiding window is provided on the common connecting plate for the limiting portion to pass through so that the limiting portion can move in the adjacent first and second installation spaces; of the two connecting plates enclosing the second installation space, a second avoiding window is provided on the non-common connecting plate for the limiting portion to pass through so that the limiting portion can move in the second installation space and another adjacent first installation space.

[0021] In one embodiment, the support member has a first fixed surface and a second fixed surface, the first fixed surface and the second fixed surface intersect, the first fixed surface is completely attached to and fixed on the surface of the connecting plate, and the second fixed surface is completely attached to and fixed on the side of the limiting plate.

[0022] In one embodiment, there are multiple limit plates, and multiple baffles are also provided on the piston rod, each of the baffles is provided between two adjacent limit plates, and each of the baffles extends axially to both ends of each baffle and respectively abuts against the two adjacent limit plates; and each of the baffles is provided with a avoidance portion.

[0023] In one of the embodiments, a plane is provided on the limiting portion, and the plane is used to abut against the limiting piece to limit the piston rod.

[0024] In one of the embodiments, a mounting hole is provided on the side wall of the sleeve at one end away from the suction nozzle, and the limiting member also includes a stop portion, one end of the limiting portion is connected to the stop portion, and the other end is a free end, the stop portion abuts against the outer wall of the sleeve, the limiting portion passes through the mounting hole, and a convex strip is provided on the limiting portion, the convex strip abuts against the inner wall of the sleeve, and the stop portion and the convex strip cooperate to fix the limiting member on the sleeve.

[0025] A suction assembly comprises: a suction tube, a liquid-stopping clamp and the above-mentioned suction device; one end of the suction tube is connected to the suction nozzle and sealed, and the liquid-stopping clamp is arranged on the suction tube to control the opening or closing of the inner cavity of the suction tube.

[0026] In one embodiment, the suction tube is detachably connected to the suction nozzle via a Luer connector; or, the suction nozzle is detachably connected to the suction tube via a thread.

[0027] A thrombectomy system, comprising:

[0028] Delivery sheath;

[0029] A catheter connector connected to the proximal end of the delivery sheath, wherein the catheter connector has a branch tube;

[0030] A reinforcing tube, which can movably pass through the delivery sheath tube and the catheter connector;

[0031] A push tube, which can movably pass through the reinforcement tube and the catheter connector;

[0032] A thrombus removal stent is connected to the distal end of the push tube. The thrombus removal stent can be accommodated in the delivery sheath tube or released from the distal end of the delivery sheath tube under the drive of the reinforcement tube; and

[0033] As in the above suction assembly, one end of the suction pipe away from the suction nozzle is sealed and connected to the branch pipe.

[0034] The suction device provided by the embodiment of the utility model drives the piston ring to move axially along the sleeve by making the piston rod move axially, so that the suction chamber is converted from a natural state to a negative pressure state, and the piston rod and the sleeve are kept relatively fixed by cooperating with the limiting plate and the limiting part, so that the negative pressure is maintained in the suction chamber. When the negative pressure is maintained in the suction chamber, the limiting plate will be squeezed toward the side of the suction nozzle by the action of atmospheric pressure. When the pressure on the limiting plate is too large, the limiting plate will be forced to bend and deform toward the side away from the suction nozzle, causing the limiting part and the limiting plate to slip and unable to form a continuous effective negative pressure. By arranging a support member to support the limiting plate, the structural strength of the limiting plate is improved, and the risk of deformation of the limiting plate is reduced, thereby reducing the risk of slipping of the limiting plate and the limiting part, so that a continuous effective negative pressure is formed in the suction chamber, and the negative pressure effect is better, thereby ensuring the smooth conduct of the suction operation during the operation.

[0035] The suction assembly provided in the embodiment of the utility model adopts the above-mentioned suction device, which can effectively improve the structural strength of the limiting plate, reduce the risk of deformation of the limiting plate, thereby reducing the risk of slipping between the limiting plate and the limiting part, and form a continuous effective negative pressure in the suction cavity. The negative pressure effect is better, thereby ensuring the smooth conduct of the suction operation during the operation.

[0036] The thrombus removal system provided in the embodiment of the utility model adopts the above-mentioned suction component, which can ensure the formation of continuous effective negative pressure in the aspirator during suction, and the negative pressure effect is good, so that the thrombus suction operation can be carried out smoothly during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] in:

[0039] Figure 1 FIG. 4 is a schematic diagram of the structure of a thrombus removal system in one embodiment of the present invention.

[0040] Figure 2 It is a schematic structural diagram of an aspirator in one embodiment of the utility model.

[0041] Figure 3 For the corresponding Figure 2 Sectional view after cutting along the center cutting line AA.

[0042] Figure 4 It is a structural schematic diagram of a sleeve in one embodiment of the utility model.

[0043] Figure 5 It is a cross-sectional view of a sleeve in another embodiment of the utility model.

[0044] Figure 6 It is a schematic structural diagram of a position limiting member in one embodiment of the utility model.

[0045] Figure 7 It is a schematic structural diagram of a piston rod in one embodiment of the utility model.

[0046] Figure 8 for Figure 7 A partial enlarged view of .

[0047] Fig. 9 It is a structural schematic diagram of a piston rod in another embodiment of the utility model.

[0048] Fig.10 It is a structural schematic diagram of a piston rod in another embodiment of the utility model.

[0049] Fig.11 It is a structural schematic diagram of a piston rod in another embodiment of the utility model.

[0050] Fig.12It is a structural schematic diagram of a piston rod in another embodiment of the utility model. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0052] In the description of the embodiments of the present utility model, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0053] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0054] In the field of interventional medical devices, the end of a medical device implanted in a human or animal body that is closer to the operator is generally called the "proximal end", and the end that is farther from the operator is called the "distal end". The "proximal end" and "distal end" of any component of the medical device are defined based on this principle. "Axial" generally refers to the length direction of the medical device when it is transported, and "radial" generally refers to the direction of the medical device that is not parallel to its "axial direction". The "axial" and "radial" of any component of the medical device are defined based on this principle. "Circumferential" refers to the circumferential direction, that is, the axial direction surrounding the lumen structure or column.

[0055] See also Figure 1 This embodiment relates to a thrombectomy system 100, which is mainly used for interventional treatment surgery. It can not only avoid the problem of severe trauma caused by traditional surgical thrombectomy, but also effectively remove the thrombus in the blood vessel.

[0056] See also Figure 1 In one embodiment, the thrombus removal system 100 includes: a delivery sheath 10, a catheter connector 20, a push tube (not shown), a reinforcement tube (not shown), a catheter connector 30, a thrombus removal bracket 40, a suction assembly 50 and a Y-valve 60.

[0057] Specifically, the catheter connector 20 is connected to the proximal end of the delivery sheath 10. The reinforcement tube (not shown in the drawings) can be movably passed through the delivery sheath 10 and the catheter connector 20, and the proximal side extends out of the proximal end of the catheter connector 20 and is connected to the proximal end of the catheter connector 30. The thrombus removal bracket 40 is connected to the distal end of the push tube, and the push tube can be movably passed through the reinforcement tube and the catheter connector 20. Driven by the reinforcement tube, the thrombus removal bracket 40 can be accommodated in the lumen of the delivery sheath 10 or released from the distal end of the delivery sheath 10. The Y-valve 60 is connected to the proximal end of the catheter connector 30, and a two-way valve 61 is provided on the side branch of the Y-valve 60. When in use, the guide wire is passed through the thrombus removal bracket 40, the push tube, the reinforcement tube, the catheter connector 20, the catheter connector 30 and the Y-valve 60, and the guide wire plays a guiding role in the movement of the thrombus removal bracket 40. The catheter connector 20 has a branch tube 201, and the suction component 50 is connected to the branch tube 201. The suction component 50 is used to extract small thrombi, free small thrombi and newly generated thrombi generated during the thrombectomy process, and expel the thrombi out of the body, effectively avoiding small thrombi from remaining in the blood vessels, thereby reducing the probability of thrombus formation again on the inner wall of the blood vessel due to the remaining small thrombi.

[0058] It should be noted that the thrombus removal stent 40 has a radial expansion state and a radial contraction state, so that it can move axially along the delivery sheath tube 10 under the drive of the reinforcement tube, thereby extending out or being accommodated in the lumen of the delivery sheath tube 10. When the thrombus removal stent 40 reaches the thrombus removal position (i.e., the embolism position), the reinforcement tube is operated to push the thrombus removal stent 40 accommodated in the delivery sheath tube 10 out of the delivery sheath tube 10, and the thrombus removal stent 40 is converted from the radial contraction state to the radial expansion state after being freed from the constraint of the delivery sheath tube 10. In the radial expansion state, the thrombus removal stent 40 can abut against the blood vessel wall, and then the thrombus located on the blood vessel wall is scraped off by the traction of the push tube, and the scraped thrombus is intercepted by the thrombus removal stent 40. After the thrombus is scraped off, the thrombus removal stent 40 is again accommodated in the delivery sheath tube 10 under the traction of the push tube, thereby completing the thrombus removal.

[0059] In one embodiment, the thrombus removal stent 40 includes a first interception portion 41 and a second interception portion 42. The proximal end of the first interception portion 41 is connected to the distal end of the push tube, and the proximal end of the second interception portion 42 is connected to the distal end of the first interception portion 41. The first interception portion 41 is mainly used to scrape and cut the thrombus in the blood vessel, and can also intercept free thrombus. The second interception portion 42 is mainly used to collect the scraped thrombus. In other embodiments, the thrombus removal stent 40 may also have only one interception portion, or have more than two interception portions.

[0060] In one embodiment, the suction assembly 50 includes: an aspirator 1, a suction tube 2 and a liquid-stopping clamp 3. The suction tube 2 is connected to the aspirator 1, and the aspirator 1 is connected to the delivery sheath 10 through the suction tube 2, and is used to aspirate free small thrombi and newly generated thrombi in the blood vessel. The liquid-stopping clamp 3 is sleeved on the suction tube 2, and is used to control the opening or closing of the lumen of the suction tube 2.

[0061] In this embodiment, the suction tube 2 is made of thermoplastic polyurethane rubber material. In other embodiments, the suction tube 2 can also be made of polycarbonate (PC), polystyrene (PS), polyamide (PA) and the like.

[0062] See also Figures 1 to 3 In one embodiment, the aspirator 1 includes: a sleeve 11 , a stopper 12 , a piston rod 13 and a piston ring 14 .

[0063] Specifically, the sleeve 11 has a suction chamber 111 (such as Figure 4 As shown) and a suction nozzle 112, and the suction nozzle 112 is connected to the suction chamber 111. The limiting member 12 is connected to the side wall of the sleeve 11, and at least partially passes through the side wall of the sleeve 11 and extends into the suction chamber 111. The piston rod 13 is movably accommodated in the suction chamber 111, and can move along the axial direction of the sleeve 11 to drive the piston ring 14 to move accordingly, so that the suction chamber 111 is in a negative pressure state or a natural state. When there is no obstruction, the piston rod 13 can also rotate in the sleeve 11. The piston rod 13 can cooperate with the part of the limiting member 12 that extends into the suction chamber 111, and the limiting member 12 limits the piston rod 13, so that the piston rod 13 and the sleeve 11 remain relatively fixed, so that the suction chamber 111 maintains a continuous effective negative pressure state. The piston ring 14 is connected to one end of the piston rod 13 close to the suction nozzle 112 and is movably accommodated in the suction chamber 111. The piston ring 14 is used to be sealedly connected to the inner wall of the suction chamber 111 and can move synchronously with the piston rod 13 .

[0064] It should be noted that before using the thrombus removal system 100 to remove the thrombus, the lumen of the suction tube 2 needs to be sealed by the liquid stop clamp 3. Then the piston rod 13 is pulled axially toward the end away from the suction nozzle 112, so that the piston ring 14 fixed on the piston rod 13 is synchronously moved toward the end away from the suction nozzle 112, and the piston ring 14 is sealed and connected to the inner wall of the suction chamber 111. After the piston rod 13 is pulled, a negative pressure environment can be formed in the suction chamber 111. When the negative pressure formed in the suction chamber 111 reaches the required requirement, the piston rod 13 is rotated circumferentially so that the piston rod 13 cooperates with the part of the stopper 12 extending into the suction chamber 111, and the piston rod 13 is limited to the position after pulling, so that the suction chamber 111 maintains a negative pressure state. After completing the above operations, the thrombus removal bracket 40 is delivered to the embolism position through the channel established between the delivery sheath 10 and the human body to perform the thrombus removal operation. During the thrombus removal process, when suction is required to remove the thrombus, the liquid-stopping clamp 3 can be directly opened, and the negative pressure in the suction cavity 111 can be used to remove the free small thrombus at the distal end of the delivery sheath 10.

[0065] Please continue to refer to 2 to Figure 4 In one embodiment, the sleeve 11 is cylindrical as a whole, and the sleeve 11 is connected to the suction tube 2 via a Luer connector 113. Specifically, the Luer male connector 1131 is connected to the end of the suction nozzle 112 away from the suction cavity 111, and the Luer female connector 1132 is connected to the end of the suction tube 2 close to the suction nozzle 112; or, the Luer female connector 1132 is connected to the end of the suction nozzle 112 away from the suction cavity 111; the Luer male connector 1131 is connected to the end of the suction tube 2 close to the suction nozzle 112.

[0066] It should be noted that, in this embodiment, the Luer male connector 1131 and the suction nozzle 112 are integrally formed, so that the sleeve 11 can be quickly connected or removed with other medical devices with a Luer female connector 1132 through the suction nozzle 112, thereby improving the convenience of using the suction device 1. The Luer female connector 1312 is connected to one end of the suction tube 2 close to the sleeve 11. In other embodiments, the Luer male connector 1131 can be connected to the suction tube 2, and the Luer female connector 1132 is integrally formed with the suction nozzle 112.

[0067] See also Figure 5In another embodiment, the sleeve 11 is connected to the suction tube 2 through an internal threaded joint 115, rather than through a Luer joint 113. That is, the suction nozzle 112 is configured as an internal threaded joint 115. An internal thread 1152 is provided on the internal threaded joint 115, and accordingly, an external threaded joint (not shown) is provided at one end of the suction tube 2 near the suction nozzle 112, and the external threaded joint cooperates with the internal threaded joint 115 to achieve a detachable connection between the aspirator 1 and the suction tube 2. The internal threaded joint 115 can be connected to other medical devices through a joint with an external thread, and has good versatility. It can be understood that in other embodiments, an external threaded joint can also be provided on the sleeve 11, and accordingly, an internal threaded joint is provided at one end of the suction tube 2 near the suction nozzle 112, and a detachable connection can also be achieved. That is, the suction nozzle 112 and the suction tube 2 can be detachably connected through a threaded joint.

[0068] See also Figure 4 and Figure 5 In one embodiment, a mounting hole 114 is provided on the side wall of the sleeve 11 away from the suction nozzle 112. Figure 6 The limiting member 12 includes a stopper 121 and a limiting portion 122 connected to the stopper 121. The end of the limiting portion 122 away from the stopper 121 is a free end. The limiting portion 122 passes through the mounting hole 114 and extends into the suction chamber 111, and extends to a side away from the stopper 121. The stopper 121 fits against the outer wall of the sleeve 11 and is fixedly connected to the outer wall of the sleeve 11.

[0069] In one embodiment, a convex strip 1221 is provided on the outer wall of the limiting portion 122. After the limiting portion 122 is provided with the mounting hole 114, the convex strip 1221 is pressed against the inner wall of the sleeve 11, and the stopper 121 is pressed against the outer wall of the sleeve 11. The cooperation between the convex strip 1221 and the stopper 121 makes the connection between the limiting member 12 and the sleeve 11 more stable.

[0070] In one embodiment, the limiting portion 122 is truncated cone-shaped as a whole, and the cross-sectional dimension of the side away from the stopper 121 is smaller than the cross-sectional dimension of the side close to the stopper 121, so that the limiting portion 122 can be smoothly inserted into the suction chamber 111 from the mounting hole 114. In another embodiment, a plane 1222 is provided on the limiting portion 122, and the plane 1222 is used to cooperate with the side of the limiting piece 132 (to be described below) close to the suction nozzle 112, so that the original line contact between the limiting portion 122 and the limiting piece 132 is changed to surface contact, thereby improving the stability of the limiting portion 122 and the limiting piece 132, thereby reducing the risk of slipping between the limiting portion 122 and the limiting piece 132. It can be understood that the plane 1222 can be formed by cutting off part of the truncated cone-shaped limiting portion 122.

[0071] See also Figure 2 , Figure 3 and Figure 7 In one embodiment, the piston rod 13 includes: a rod body 131, a limiting piece 132 and a support member 133. The limiting piece 132 is connected to the rod body 131 and is used to cooperate with the limiting portion 122 to limit the piston rod 13 so that the suction chamber 111 maintains a continuous effective negative pressure state. The support member 133 is located on the side of the limiting piece 132 away from the suction nozzle 112. The support member 133 is connected to the rod body 131, and the support member 133 is against the side of the limiting piece 132 away from the suction nozzle 112. The support member 133 is used to support the limiting piece 132 to enhance the structural strength of the limiting piece 132, and prevent the limiting piece 122 from slipping off the limiting piece 132 due to elastic deformation of the limiting piece 132 under the action of atmospheric pressure, thereby forming a continuous effective negative pressure in the aspirator 1 to obtain a better negative pressure effect.

[0072] It should be noted that when the suction chamber 111 is under negative pressure (i.e., the air pressure in the suction chamber 111 is less than the atmospheric pressure), the piston rod 13 is squeezed by the atmospheric pressure and has a tendency to move toward the suction nozzle 112. In other words, when the suction chamber 111 is under negative pressure, the limiting piece 132 will be pressed against the limiting portion 122 under the action of the atmospheric pressure. If the limiting piece 132 is under too much pressure, it will force the limiting piece 132 to bend and deform toward the side away from the suction nozzle 112, causing the limiting portion 122 and the limiting piece 132 to slip off. The setting of the support member 133 can support the limiting piece 132, thereby preventing the limiting piece 132 from being deformed and reducing the risk of the limiting portion 122 and the limiting piece 132 slipping off.

[0073] Please continue reading Figure 2 , Figure 3 and Figure 7 In one embodiment, the rod body 131 includes a mounting end 1311, a push-pull end 1312, and a plurality of connecting plates 1313 connecting the mounting end 1311 and the push-pull end 1312. Specifically, the piston ring 14 is sleeved on the mounting end 1311. The push-pull end 1312 is used for the operator to apply thrust, pulling force or rotational force, thereby driving the rod body 131 to axially displace or circumferentially rotate. Each connecting plate 1313 extends along the axial direction of the sleeve 11, and at the same time, an axially extending side edge of each connecting plate 1313 converges on the axis of the sleeve 11 and is connected to the axially extending side edges of other connecting plates 1313. The limiting plate 132 is located between adjacent connecting plates 1313 and is connected to one of the connecting plates 1313.

[0074] It should be noted that when the suction chamber 111 is in a natural state, the piston rod 13 is located at the most initial position, and the piston ring 14 fits with the bottom wall of the suction chamber 111. The limiting portion 122 is located at the proximal end of the sleeve 11, and there is a gap between the limiting portion 122 and the limiting piece 132 in the axial direction. The piston rod 13 moves axially toward the proximal end so that the end face of the limiting piece 132 on the side close to the suction nozzle 112 cooperates with the limiting portion 122. Therefore, a gap is formed between the end of the limiting piece 132 away from the connecting plate 1313 connected thereto and the adjacent connecting plate 1313, so that the limiting portion 122 can pass through the gap and cooperate with the limiting piece 132 to limit the piston rod 13, so that the suction chamber 111 maintains a negative pressure state.

[0075] In one embodiment, a plurality of limiting pieces 132 are provided, and the plurality of limiting pieces 132 are all provided on the same side of the same connecting plate 1313, and the plurality of limiting pieces 132 are spaced apart along the axial direction of the rod body 131. The limiting portion 122 can cooperate with one of the limiting pieces 132 to provide a plurality of negative pressure states with different pressures in the suction chamber 111, and different negative pressure states with different negative pressures in the suction chamber 111 can be selected according to different requirements during use.

[0076] Accordingly, a plurality of support members 133 are provided. In one embodiment, the plurality of support members 133 correspond to the plurality of limit plates 132 one by one, and each limit plate 132 is supported by a support member 133. In another embodiment, the number of support members 133 is less than the number of limit plates 132, and the limit plate 132 at the nearest end is not provided with a corresponding support member 133. When the limit member 12 abuts against the limit plate 132 at the nearest end, the limit plate 132 is subjected to less pressure, and the possibility of deformation is relatively small, and the support member 133 may not be provided.

[0077] Please also read Figure 7 and Figure 8 In one embodiment, the support member 133 has a first fixed surface 1331 and a second fixed surface 1332, and the first fixed surface 1331 and the second fixed surface 1332 intersect. The first fixed surface 1331 is used to be fixedly connected to the connecting plate 1313, and the second fixed surface 1332 is used to be connected to the limiting piece 132 to resist the limiting piece 132, thereby improving the anti-deformation ability of the limiting piece 132. The first fixed surface 1331 is completely attached to and fixed on the surface of the connecting plate 1313, and the second fixed surface 1332 is completely attached to and fixed on the side of the limiting piece 132, so that the support member 133 can better support the limiting piece 132.

[0078] In one embodiment, the support member 133 is a triangular sheet structure, and the first fixing surface 1331 and the second fixing surface 1333 are two side surfaces of the triangular sheet structure. Such an arrangement enables the support member 133 to have better supporting performance.

[0079] See also Figure 2 , Figure 3 and Fig. 9 In one embodiment, on the basis of setting the support member 133, the limiting plate 132 is inclined toward the end where the suction nozzle 112 is located, and the angle θ between the limiting plate 132 and the rod body 131 is greater than or equal to 30 degrees and less than 90 degrees. The limiting plate 132 is set in this way, which increases the deformation required for the limiting plate 132 and the limiting portion 122 to slip off, thereby reducing the risk of the limiting portion 122 and the limiting plate 132 slipping off.

[0080] It should be noted that, in this embodiment, the angle θ between the limiting piece 132 and the rod body 131 refers to the angle between the limiting piece 132 and the connecting plate 1313 directly connected thereto. In one embodiment, the angle θ between the limiting piece 132 and the connecting plate 1313 directly connected thereto is 80 degrees.

[0081] It should also be noted that when the limiting plate 132 is tilted toward the end where the suction nozzle 112 is located, the structure of the support member 133 should be adjusted accordingly so that the first fixing surface 1331 of the support member 133 is completely fitted and fixed on the surface of the connecting plate 1313, and the second fixing surface 1332 is completely fitted and fixed on the side of the limiting plate 132.

[0082] See also Fig.10 In one embodiment, on the basis of omitting the support member 133, the limiting plate 132 is tilted toward the end where the suction nozzle 112 is located, and the angle θ between the limiting plate 132 and the rod body 131 is greater than or equal to 30 degrees and less than 90 degrees. The limiting plate 132 set in this way increases the deformation required for the limiting plate 132 and the limiting portion 122 to slip off, and can also effectively reduce the risk of the limiting portion 122 and the limiting plate 132 slipping off.

[0083] See also Figure 2 , Figure 3 and Fig.11 In one embodiment, a plurality of limit plates 132 are provided, and each limit plate 132 is connected to two adjacent connecting plates 1313. A plurality of avoidance openings 1314 are provided on one of the two adjacent connecting plates 1313, and each avoidance opening 1314 is located between two adjacent limit plates 132 in the axial direction, so that the limit portion 122 can pass through the avoidance opening 1314 and smoothly cooperate with the limit plate 132 to limit the piston rod 13. The limit plates 132 are connected to the two adjacent connecting plates 1313, which is conducive to further improving the anti-deformation ability of the limit plates 132, thereby improving the position stability of the piston rod 13 to obtain a stable negative pressure effect.

[0084] In one embodiment, the limiting plate 132 is a fan-shaped sheet structure, and the central angle of the fan-shaped sheet structure is equal to the angle between two adjacent connecting plates 1313, so that the two non-arc edges of the fan-shaped sheet structure are respectively connected to the surfaces of the two adjacent connecting plates 1313.

[0085] It can be understood that when the limiting plate 132 forms a gap with the other of the two adjacent connecting plates 1313, a fan-shaped sheet structure with a central angle smaller than the angle between the two adjacent connecting plates 1313 can be selected, so that when one non-arc edge of the fan-shaped sheet structure is fixed to one of the connecting plates 1313, the other non-arc edge forms a gap with the other connecting plate 1313.

[0086] See also Fig.12 In one embodiment, a plurality of baffles 1321 are also provided on the piston rod 13. The plurality of baffles 1321 and the plurality of limiting plates 132 are provided on the same connecting plate 1313, each baffle 1321 is provided between two adjacent limiting plates 132, and each baffle 1321 extends axially to both ends of each baffle 1321 and respectively abuts against two adjacent limiting plates 132. A avoiding portion 13211 is provided on each baffle 1321. The baffle 1321 with the avoiding portion 13211 is provided, and the connecting plate 1313, the two adjacent limiting plates 132 and the baffle 1321 form a smaller space, and the limiting portion 122 enters the smaller space through the avoiding portion 13211 and abuts against the limiting plate 132, thereby effectively preventing the limiting portion 122 from slipping off from the limiting plate 132.

[0087] It should be noted that, when a plurality of stoppers 1321 are further provided on the piston rod 13 , the stopper 132 may be connected to only one of two adjacent connecting plates 1313 , or may be connected to both adjacent connecting plates 1313 at the same time.

[0088] When the limiting plate 132 is fixed on the surface of one of the two adjacent connecting plates 1313, and a gap is formed between the limiting plate 132 and the other of the two adjacent connecting plates 1313, the limiting portion 122 successively passes through the gap and the avoiding portion 13211 to enter the above-mentioned smaller space and abut against the limiting plate 132, or the limiting portion 122 successively passes through the avoiding portion 13211 and the gap to come out of the above-mentioned smaller space.

[0089] When the limiting piece 132 is connected to two adjacent connecting plates 1313 at the same time, the avoiding portion 13211 of the blocking piece 1321 and the avoiding opening 1314 of the connecting plate 1313 should be reasonably arranged so that the limiting portion 132 can pass through the avoiding opening 1314 and the avoiding portion 13211 in sequence to enter the connecting plate 1313, the two adjacent limiting pieces 132 and the blocking piece 1321 to form a smaller space and abut against the limiting piece 132, or exit through the avoiding portion 13211 and the avoiding opening 1314 in sequence.

[0090] In one embodiment, a plurality of baffles 1321 can be provided on the basis of omitting the support member 133, and the plurality of baffles 1321 are arranged along the axial direction, and a surface of each baffle 1321 is fixedly connected to the connecting plate 1313, and each baffle 1321 extends along the axial direction to the two ends of each baffle 1321 and respectively abuts against two adjacent limiting plates 132, and the plurality of limiting plates 132, the plurality of baffles 1321 and the connecting plate 1313 connected thereto are connected as a whole, and each baffle 1321 provides good support for the limiting plate 132 located at its far end, thereby effectively preventing the limiting portion 122 and the limiting plate 132 from slipping off.

[0091] Please continue reading Figure 7 In one embodiment, one side of a plurality of connecting plates 1313 extending in the axial direction converges on the axis of the sleeve 11 and is connected to form at least two first installation spaces A and at least two second installation spaces B. The first installation spaces A and the second installation spaces B are arranged alternately in the circumferential direction. Two adjacent connecting plates 1313 enclose the first installation space A, and two adjacent connecting plates 1313 enclose the second installation space B. The first installation space A and the second installation space B share one connecting plate 1313. In the first installation space A, a plurality of limiting plates 132 arranged in the axial direction are arranged on the common connecting plate 1313. In the second installation space B, a limiting plate 132 is arranged on the other side of the common connecting plate 1313, and the limiting plate 132 is located at the far end of the connecting plate 1313; and a first avoiding window 13131 is opened on the common connecting plate 1313 for the limiting portion 122 to pass through so that the limiting portion 122 moves in the adjacent first installation space A and the second installation space B. In the two connecting plates 1313 that enclose the second installation space B, a second avoiding window 13132 is opened on the non-shared connecting plate 1313 for the limiting portion 122 to pass through so that the limiting portion 122 can move in the second installation space B and the other first installation space A.

[0092] The connecting plate 1313 and the limiting plate 132 are arranged in the above manner. On the one hand, when the piston rod 13 is at different circumferential positions, the limiting plate 132 and the limiting portion 122 can be quickly abutted against each other, which is convenient for operation; on the other hand, the strength of the piston rod 131 can be higher, thereby improving the structural stability.

[0093] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A suction device, characterized in that: include: A sleeve having a suction chamber and a suction nozzle; A limiting member having a limiting portion, wherein the limiting member is connected to the side wall of the sleeve, and the limiting portion at least partially passes through the side wall of the sleeve and extends into the suction chamber; A piston rod is movably accommodated in the suction chamber and is capable of axial movement and circumferential rotation along the sleeve, wherein the piston rod comprises: a rod body, a limiting plate and a supporting member, wherein the limiting plate is connected to the rod body and is used to cooperate with the limiting portion to limit the piston rod, and the supporting member is connected to the rod body, and the supporting member abuts against a side surface of the limiting plate away from the suction nozzle to support the limiting plate; as well as, The piston ring is connected to one end of the rod body close to the suction nozzle, and the piston ring is sealed to the inner wall of the suction chamber, and can synchronously move axially with the rod body to put the suction chamber in a negative pressure state or restore it to a natural state.

2. The aspirator according to claim 1, characterized in that: The limiting piece is inclined toward the end where the suction nozzle is located, so that the angle θ between the limiting piece and the rod body is greater than or equal to 30 degrees and less than 90 degrees.

3. The aspirator according to claim 1, characterized in that: There are multiple limit plates, and the limit plates are spaced apart along the axis of the rod body. The limit portion can cooperate with one of the limit plates to provide multiple negative pressure states with different pressures in the suction chambers. There are multiple support members, and the multiple support members correspond one-to-one to the multiple limiting plates, or there are multiple support members, the number of the support members is less than the number of the limiting plates, and the limiting plate located at the nearest end is not provided with a corresponding support member.

4. The aspirator according to claim 1, characterized in that: The rod body includes: a mounting end, a push-pull end and a plurality of connecting plates connecting the mounting end and the push-pull end; the piston ring is sleeved on the mounting end, each of the connecting plates extends along the axial direction of the sleeve, and a side edge of each of the connecting plates extending along the axial direction converges on the axis of the sleeve and is connected to the side edges of other connecting plates; the limiting plate is located between two adjacent connecting plates and is connected to one of the connecting plates.

5. The aspirator according to claim 4, characterized in that: There are multiple limiting plates, and the limiting plates are distributed at intervals along the axial direction of the connecting plate; Each of the limiting plates is fixed on the surface of one of the two adjacent connecting plates, and a gap is formed between the limiting plate and the other of the two adjacent connecting plates; or, Each of the limiting plates is connected to two adjacent connecting plates, and one of the connecting plates is provided with a plurality of avoiding openings. In the axial direction, each avoiding opening is located between two adjacent limiting plates.

6. The aspirator according to claim 4, characterized in that: One axially extending side edge of each of the plurality of connecting plates converges on the axis of the sleeve and is connected to form at least two first installation spaces and at least two second installation spaces, the at least two first installation spaces and at least two second installation spaces are alternately arranged in the circumferential direction, two adjacent connecting plates enclose the first installation space, two adjacent connecting plates enclose the second installation space, and the first installation space and the second installation space share a connecting plate, in the first installation space, a plurality of axially spaced limiting plates are arranged on the side surface of the common connecting plate; in the second installation space, a limiting plate is arranged on the other side opposite to the common connecting plate, and the limiting plate is located at the far end of the common connecting plate; and a first avoiding window is provided on the common connecting plate for the limiting part to pass through so that the limiting part can move in the adjacent first installation space and the second installation space; in the two connecting plates enclosing the second installation space, a second avoiding window is provided on the non-common connecting plate for the limiting part to pass through so that the limiting part can move in the second installation space and another adjacent first installation space.

7. The aspirator according to claim 4, characterized in that: The support member has a first fixing surface and a second fixing surface, the first fixing surface and the second fixing surface intersect each other, the first fixing surface is completely attached to and fixed on the surface of the connecting plate, and the second fixing surface is completely attached to and fixed on the side of the limiting plate.

8. The aspirator according to claim 1, characterized in that: There are multiple limiting plates, and multiple blocking plates are also arranged on the piston rod, each blocking plate is arranged between two adjacent limiting plates, and each blocking plate extends axially to both ends of each blocking plate and respectively abuts against the two adjacent limiting plates; and each blocking plate is provided with a avoiding portion.

9. The aspirator according to claim 1, characterized in that: The limiting portion is provided with a plane, and the plane is used to abut against the limiting sheet to limit the piston rod.

10. The aspirator according to claim 1, characterized in that A mounting hole is provided on the side wall of the sleeve at one end away from the suction nozzle, and the limiting member also includes a stop portion, one end of the limiting portion is connected to the stop portion, and the other end is a free end, the stop portion abuts against the outer wall of the sleeve, the limiting portion passes through the mounting hole, and a convex strip is provided on the limiting portion, the convex strip abuts against the inner wall of the sleeve, and the stop portion and the convex strip cooperate to fix the limiting member on the sleeve.

11. A suction assembly, characterized in that: include: A suction tube, a liquid-stopping clamp and a suction device as described in any one of claims 1 to 10; one end of the suction tube is connected to the suction nozzle and sealed, and the liquid-stopping clamp is provided on the suction tube to control the opening or closing of the inner cavity of the suction tube.

12. The suction assembly according to claim 11, characterized in that The suction tube is detachably connected to the suction nozzle via a Luer joint; or, the suction nozzle is detachably connected to the suction tube via a thread.

13. A thrombus removal system, characterized in that: include: Delivery sheath; A catheter connector connected to the proximal end of the delivery sheath, wherein the catheter connector has a branch tube; A reinforcing tube, which can movably pass through the delivery sheath tube and the catheter connector; A push tube, which can movably pass through the reinforcement tube and the catheter connector; A thrombus removal stent is connected to the distal end of the push tube. The thrombus removal stent can be accommodated in the delivery sheath tube or released from the distal end of the delivery sheath tube under the drive of the reinforcement tube; and According to the suction assembly as described in claim 11, one end of the suction pipe away from the suction nozzle is sealed and connected to the branch pipe.

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