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 plurality of limiting pieces and a plurality of supporting pieces, and the multiple limiting pieces are arranged on the rod body at intervals in the axial direction of the rod body and used for being matched with the limiting part so as to limit the piston rod; the two ends of each supporting piece abut against the two adjacent limiting pieces respectively. 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with thrombectomy devices, the thrombus is brought into the delivery sheath through the thrombectomy device and withdrawn with the delivery sheath, while the small thrombi, free small thrombi and newly generated thrombi generated by the thrombectomy device during the thrombectomy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 axially reciprocating and circumferentially rotating along the sleeve, the piston rod comprising: a rod body, a plurality of limiting plates and a plurality of supporting members, the plurality of limiting plates are arranged on the rod body at intervals along the axial direction of the rod body and are used to cooperate with the limiting portion to limit the piston rod, and the two ends of each supporting member are respectively against two adjacent limiting plates; 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 reciprocate 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 embodiment, each of the support members is provided with a avoidance window for the limiting portion to pass through; or, the support member has a free end, and the end surface of the limiting portion extending into the suction chamber and the end surface of the free end of the support member have a radial gap for the limiting portion to pass through.

[0015] In one embodiment, the plurality of support members extend axially in a straight line; or,

[0016] A portion of the plurality of support members extends axially on a first straight line, and another portion extends axially on a second straight line, wherein the first straight line and the second straight line are parallel; or,

[0017] Two adjacent limiting pieces and the support member located between the two limiting pieces form an angle less than or equal to 90°, so that the limiting portion can abut against the limiting piece and the support member at the same time.

[0018] 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 at least one of the connecting plates.

[0019] In one embodiment, the plurality of limiting plates are distributed at intervals along the axial direction of the connecting plate;

[0020] 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,

[0021] 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.

[0022] In one embodiment, each of the limiting pieces and each of the supporting members are fixed on the surface of one of the two adjacent connecting plates, and each of the limiting pieces and the supporting members forms a gap with the other of the two adjacent connecting plates, and the limiting portion can pass through the gap and the supporting member in sequence and abut against the limiting piece; or, the limiting portion can pass through the gap and abut against the limiting piece; or,

[0023] When 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, and each avoiding opening is located between two adjacent limiting plates in the axial direction, each of the supporting members is fixedly connected to one of the connecting plates, and the limiting portion can pass through the avoiding opening and the supporting member in sequence and abut against the limiting plate; or, the limiting portion can pass through the avoiding opening and abut against the limiting plate.

[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, a flange is provided on the outer wall of the limiting portion, the flange abuts against the inner wall of the sleeve, and the stop portion and the flange 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] In the above-mentioned suction assembly, one end of the suction pipe away from the suction nozzle is sealedly connected to the branch pipe.

[0034] The suction device provided by the embodiment of the utility model drives the piston ring to move along the axial direction of the sleeve by making the piston rod reciprocate along the axial direction of the sleeve, 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 the cooperation of 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 This is a schematic structural diagram of a thrombus removal system in one embodiment of the utility model;

[0040] Figure 2This 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 section line AA;

[0042] Figure 4 This is a schematic diagram of the structure of a sleeve in one embodiment of the utility model;

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

[0044] Figure 6 This is a schematic diagram of the structure 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 This is a schematic structural diagram of a piston rod in another embodiment of the utility model in which the limiting plate is omitted. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] See also Figure 1 , this embodiment relates to a thrombus removal system 100 for thrombus removal.

[0052] 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.

[0053] Specifically, the catheter connector 20 is connected to the proximal end of the delivery sheath 10. The reinforcing tube (not shown in the drawings) can be movably passed through the delivery sheath 10 and the catheter connector 20, and the proximal end of the reinforcing tube 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 reinforcing tube and the catheter connector 20. Under the drive of the reinforcing 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 610 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 reinforcing 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 210, and the suction component 50 is connected to the branch tube 210. 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.

[0054] It should be noted that the thrombus removal stent 40 has a radial expansion state and a radial contraction state, so that it can be accommodated in the reinforcement tube, and move axially along the delivery sheath tube 10 under the drive of the reinforcement tube, so as to be accommodated in the lumen of the delivery sheath tube 10 or extend from 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 to extend 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 reinforcement tube. 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 pulling 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 pulling action of the push tube, thereby completing the thrombus removal.

[0055] In one embodiment, the thrombus removal stent 40 includes a first interception portion 410 and a second interception portion 420. The proximal end of the first interception portion 410 is connected to the distal end of the push tube, and the proximal end of the second interception portion 420 is connected to the distal end of the first interception portion 410. The first interception portion 410 is mainly used to scrape and cut the thrombus in the blood vessel, and can also intercept free thrombus. The second interception portion 420 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.

[0056] In one embodiment, the suction assembly 50 includes: an aspirator 510, a suction tube 520 and a liquid-stopping clamp 530. The suction tube 520 is connected to the aspirator 510, and the aspirator 510 is connected to the delivery sheath 10 through the suction tube 520, and is used to aspirate free small thrombi and newly generated thrombi in the blood vessel. The liquid-stopping clamp 530 is sleeved on the suction tube 520, and is used to control the opening or closing of the lumen of the suction tube 520.

[0057] In this embodiment, the suction tube 520 is made of thermoplastic polyurethane rubber material. In other embodiments, the suction tube 520 can also be made of polycarbonate (PC), polystyrene (PS), polyamide (PA), etc.

[0058] See also Figure 2 and Figure 3 In one embodiment, the aspirator 510 includes: a sleeve 511 , a stopper 512 , a piston rod 513 and a piston ring 514 .

[0059] For details, please refer to Figure 4The sleeve 511 has a suction chamber 5111 and a suction nozzle 5112, and the suction chamber 5111 is connected to the suction nozzle 5112. The stopper 512 is connected to the side wall of the sleeve 511, and at least partially passes through the side wall of the sleeve 511 and extends into the suction chamber 5111. The piston rod 513 is movably accommodated in the suction chamber 5111, and can reciprocate along the axial direction of the sleeve 511 to drive the piston ring 514 to move accordingly, so that the suction chamber 5111 is in a negative pressure state or a natural state. When there is no obstruction, the piston rod 513 can also rotate circumferentially in the sleeve 511. The piston rod 513 can cooperate with the part of the stopper 512 that extends into the suction chamber 5111, and the stopper 512 limits the piston rod 513, so that the piston rod 513 and the sleeve 511 remain relatively fixed, so that the suction chamber 5111 maintains a continuous effective negative pressure state. The piston ring 514 is connected to one end of the piston rod 513 close to the suction nozzle 5112 and is movably accommodated in the suction chamber 5111. The piston ring 514 is used to be sealed and connected to the inner wall of the suction chamber 5111, and can move synchronously with the piston rod 513.

[0060] It should be noted that before using the thrombus removal system 100 to remove the thrombus, the lumen of the suction tube 520 needs to be sealed by the liquid stop clamp 530. Then the piston rod 513 is pulled axially toward the end away from the suction nozzle 5112, so that the piston ring 514 fixed on the piston rod 513 is synchronously moved toward the end away from the suction nozzle 5112, and the piston ring 514 is sealed and connected to the inner wall of the suction chamber 5111. After the piston rod 513 is pulled, a negative pressure environment can be formed in the suction chamber 5111. When the negative pressure formed in the suction chamber 5111 reaches the required requirement, the piston rod 513 is rotated circumferentially, so that the piston rod 513 cooperates with the part of the stopper 512 extending into the suction chamber 5111, and the piston rod 513 is limited to the position after being pulled, so that the suction chamber 5111 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 530 can be directly opened, and the negative pressure in the suction cavity 5111 can be used to remove the free small thrombus at the distal end of the delivery sheath 10.

[0061] Please continue to refer to 2 to Figure 4In one embodiment, the sleeve 511 is cylindrical as a whole, and the sleeve 511 is connected to the suction tube 520 via a Luer connector 515. Specifically, the Luer male connector 5151 is connected to the end of the suction nozzle 5112 away from the suction cavity 5111, and the Luer female connector 5152 is connected to the end of the suction tube 520 close to the suction nozzle 5112; or, the Luer female connector 5152 is connected to the end of the suction nozzle 5112 away from the suction cavity 5111; the Luer male connector 5151 is connected to the end of the suction tube 520 close to the suction nozzle 5112.

[0062] It should be noted that, in this embodiment, the Luer male connector 5151 and the suction nozzle 5112 are integrally formed, so that the sleeve 511 can be quickly connected or removed with other medical devices with a Luer female connector 5152 through the suction nozzle 5112, thereby improving the convenience of using the aspirator 510. The Luer female connector 5152 is connected to one end of the suction tube 520 close to the sleeve 511. In other embodiments, the Luer male connector 5151 can be connected to the suction tube 520, and the Luer female connector 5152 and the suction nozzle 5112 are integrally formed.

[0063] See also Figure 5 In another embodiment, the sleeve 511 is connected to the suction tube 520 through an internal threaded joint 516, rather than through a Luer joint 515. That is, the suction nozzle 5112 is configured as an internal threaded joint 516. An internal thread 5161 is provided on the internal threaded joint 516, and accordingly, an external threaded joint (not shown) is provided at one end of the suction tube 520 near the suction nozzle 5112, and the external threaded joint cooperates with the internal threaded joint 516 to achieve a detachable connection between the aspirator 510 and the suction tube 520. The internal threaded joint 516 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 511, and accordingly, an internal threaded joint is provided at one end of the suction tube 520 near the suction nozzle 5112, and a detachable connection can also be achieved. That is, the suction nozzle 5112 and the suction tube 520 can be detachably connected through a threaded joint.

[0064] See also Figure 4 and Figure 5 In one embodiment, a mounting hole 5113 penetrating through the side wall of the sleeve 511 is provided on the side wall of the sleeve 511 at the end away from the suction nozzle 5112 .

[0065] See also Figure 6In one embodiment, the limiting member 512 includes a stopper 5121 and a limiting portion 5122 connected to the stopper 5121. The end of the limiting portion 5122 away from the stopper 5121 is a free end. The limiting portion 5122 passes through the mounting hole 5113 and extends into the suction chamber 5111, and extends to a side away from the stopper 5121. The stopper 5121 is attached to the outer wall of the sleeve 511 and is fixedly connected to the outer wall of the sleeve 511.

[0066] In one embodiment, a flange 51221 is provided on the outer wall of the limiting portion 5122. After the limiting portion 5122 is provided with the mounting hole 5113, the flange 51221 is pressed against the inner wall of the sleeve 511, and the stopper 5121 is pressed against the outer wall of the sleeve 511. The flange 51221 cooperates with the stopper 5121 to make the connection between the limiting member 512 and the sleeve 511 more stable.

[0067] In one embodiment, the limiting portion 5122 is overall in the shape of a truncated cone, and the cross-sectional dimension of the side away from the stopping portion 5121 is smaller than the cross-sectional dimension of the side close to the stopping portion 5121, so that the limiting portion 5122 can pass through the mounting hole 5113 into the suction chamber 5111 more smoothly.

[0068] In another embodiment, a plane 51222 is provided on the side of the limiting portion 5122, and the plane 51222 is used to cooperate with the side of the limiting piece 5132 (to be described below) close to the suction nozzle 112, so that the contact between the limiting portion 5122 and the limiting piece 5132 is surface contact, so that the stability of the limiting portion 5122 and the limiting piece 5132 is high, thereby reducing the risk of slipping between the limiting portion 5122 and the limiting piece 5132. It can be understood that the plane 51222 can be formed by cutting off a part of the truncated cone-shaped limiting portion 5122.

[0069] See also Figure 7 In one embodiment, the piston rod 513 includes: a rod body 5131, a plurality of limiting pieces 5132 and a plurality of supporting members 5133. The plurality of limiting pieces 5132 are arranged on the rod body 5131 at intervals along the axial direction of the rod body 5131, and are used to cooperate with the limiting portion 5122 to limit the piston rod 513, so that the suction chamber 5111 maintains a continuous effective negative pressure state. Each supporting member 5133 is arranged between two adjacent limiting pieces 5132, and the two ends of each supporting member 5133 are respectively against the two adjacent limiting pieces 5132 to support the limiting piece 5132, thereby improving the structural strength of the limiting piece 5132, preventing the limiting portion 5122 from slipping off the limiting piece 5132 due to elastic deformation of the limiting piece 5132 under the action of atmospheric pressure, so that a continuous effective negative pressure is formed in the aspirator 510, so as to obtain a better negative pressure effect.

[0070] It should be noted that when the suction chamber 5111 is under negative pressure (i.e., the air pressure in the suction chamber 5111 is less than the atmospheric pressure), the piston rod 513 is squeezed by the atmospheric pressure and has a tendency to move toward the suction nozzle 5112. In other words, when the suction chamber 5111 is under negative pressure, the limiting piece 5132 will be pressed against the limiting portion 122 under the action of the atmospheric pressure. If the limiting piece 5132 is subjected to too much pressure, it will force the limiting piece 5132 to bend and deform toward the side away from the suction nozzle 5112, causing the limiting portion 5122 and the limiting piece 5132 to slip off. The setting of the support member 5133 can support the limiting piece 5132, thereby preventing the limiting piece 5132 from being deformed and reducing the risk of the limiting portion 122 and the limiting piece 5132 slipping off.

[0071] Please continue reading Figure 7 In one embodiment, the rod body 5131 includes a mounting end 51311, a push-pull end 51312, and a plurality of connecting plates 51313 connecting the mounting end 51311 and the push-pull end 51312. Specifically, the piston ring 514 is sleeved on the mounting end 51311. The push-pull end 51312 is used for the operator to apply thrust, pulling force or rotational force, thereby driving the rod body 5131 to axially displace or circumferentially rotate. Each connecting plate 51313 extends along the axial direction of the sleeve 511, and at the same time, a side edge of each connecting plate 51313 extending along the axial direction converges on the axis of the sleeve 511 and is connected to the side edge of the other connecting plates 51313 extending along the axial direction. The limiting plate 5132 is located between adjacent connecting plates 51313 and is connected to one of the connecting plates 51313.

[0072] It should be noted that when the suction chamber 5111 is in a natural state, the piston rod 513 is located at the most initial position, and the piston ring 514 is in contact with the bottom wall of the suction chamber 5111, and the limiting portion 5122 is located at the proximal end of the sleeve 511, and there is a gap between the limiting portion 5122 and the limiting piece 5132 in the axial direction. The piston rod 513 moves axially toward the proximal end so that the end face of the limiting piece 5132 on the side close to the suction nozzle 5112 cooperates with the limiting portion 5122. Therefore, a gap is formed between the end of the limiting piece 5132 away from the connecting plate 51313 connected thereto and the adjacent connecting plate 51313, so that the limiting portion 5122 can pass through the gap and cooperate with the limiting piece 5132 to limit the piston rod 513, so that the suction chamber 111 maintains a negative pressure state.

[0073] In one embodiment, a plurality of limiting pieces 5132 are arranged on the same side of a same connecting plate 51313, and the plurality of limiting pieces 5132 are spaced apart along the axial direction of the connecting plate 51313. The limiting portion 5122 can cooperate with one of the limiting pieces 5132 to provide a plurality of negative pressure states with different pressures in the suction chamber 5111, and different negative pressure states with different negative pressures in the suction chamber 5111 can be selected according to different requirements during use.

[0074] See also Figure 8 In another embodiment, each limiting piece 5132 is connected to two adjacent connecting plates 51313. A plurality of avoiding openings 51314 are provided on one of the two adjacent connecting plates 51313, and each avoiding opening 51314 is located between two adjacent limiting pieces 5132 in the axial direction, so that the limiting portion 5122 can pass through the avoiding opening 51314 and smoothly cooperate with the limiting piece 5132 to limit the piston rod 513. The limiting pieces 5132 are connected to the two adjacent connecting plates 51313, which is conducive to further improving the anti-deformation ability of the limiting pieces 5132, thereby improving the position stability of the piston rod 513, so as to obtain a stable negative pressure effect.

[0075] In one embodiment, the limiting plate 5132 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 51313, 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 51313.

[0076] It can be understood that when the limiting plate 5132 forms a gap with the other of the two adjacent connecting plates 51313, a fan-shaped sheet structure with a central angle smaller than the angle between the two adjacent connecting plates 51313 can be selected, so that when a non-arc edge of the fan-shaped sheet structure is fixed to one of the connecting plates 51313, the other non-arc edge forms a gap with the other connecting plate 51313.

[0077] Please go back Figure 7 In one embodiment, a plurality of support members 5133 extend axially in a straight line to support each other in the axial direction, so that a plurality of limiting plates 5132 and a plurality of support members 5133 are connected as a whole, so that each support member 5133 provides good support for the limiting plate 5132, thereby effectively preventing the limiting portion 5122 from slipping off the limiting plate 5132.

[0078] In another embodiment, a portion of the plurality of support members 5133 extends axially on a first straight line, and another portion extends axially on a second straight line, and the first straight line and the second straight line are parallel. In this way, the plurality of support members 5133 can also support the limiting piece 5132 more reliably.

[0079] In another embodiment, two adjacent limiting pieces 5132 and the support member 5133 located between the two limiting pieces 5132 form an angle less than or equal to 90°, so that the limiting portion 5122 can better abut against the limiting piece 5132 and the support member 5133 at the same time, thereby improving the ability to resist deformation. That is, the limiting portion 5122 enters the space surrounded by the support member 5133 and the limiting piece 5132, and is abutted by the support member 5133 and the limiting piece 5132.

[0080] Please continue reading Figure 7 In one embodiment, the support member 5133 is also connected to the connecting plate 5133 where the limiting plate 5132 is located, so that the limiting plate 5132, the support member 5133 and the connecting plate 51313 are connected as a whole, thereby improving the structural strength of the piston rod 513 itself and improving the strength of the limiting plate 5132.

[0081] Please continue reading Figure 7 In one embodiment, each limiting plate 5132 and each supporting member 5133 are fixed on the surface of one of the two adjacent connecting plates 51313, and the limiting plate 5132 and the supporting member 5133 form a gap with the other of the two adjacent connecting plates 51313, and the limiting portion 5122 can pass through the gap and the supporting member 5133 in sequence and abut against the limiting plate 5132.

[0082] In one embodiment, each support member 5133 is provided with an avoidance window 51331 to facilitate the limiting portion 5122 to pass through the support member 5133 through the gap and abut against the limiting piece 5132 .

[0083] In another embodiment, the end of the support member 5133 away from the connecting plate 51313 where the limiting piece 5132 is located is a free end, and a gap is formed in the radial direction between the end surface of the portion of the limiting portion 5122 extending into the suction chamber 5111 and the end surface of the free end of the support member 5133 for the limiting portion 5122 to pass through. That is, the height of the support member 5133 is relatively low, and the movement of the limiting portion 5122 is not blocked.

[0084] In another embodiment, when the support member 5133 is disposed on a side of two adjacent limiting pieces 5132 that is closer to the connecting plate 51313 connected to the limiting piece 5132, the support member 5133 does not block the limiting portion 5122, and the limiting portion 5122 can directly abut against the limiting piece 5132 after passing through the gap between the limiting piece 5132 and the connecting plate 51313. In this case, there is no need to provide the avoiding window 51331 on the support member 5133, and there is no excessive restriction on the height of the support member 5133. After the support member 5133 is connected to the rod body 5131, it is sufficient to ensure that the piston rod 513 can reciprocate and rotate along the axial direction in the suction chamber 5111 of the sleeve 511.

[0085] In other embodiments, when the limiting plate 5132 is connected to two adjacent connecting plates 51313 at the same time, and the supporting member 5133 is arranged at a position of the connecting plate 51313 close to the avoiding opening 51314, the avoiding window 51331 of the supporting member 5133 and the avoiding opening 51314 of the connecting plate 51313 should be reasonably arranged so that the limiting portion 5122 can pass through the avoiding opening 51314 and the avoiding window 51331 in sequence to enter a smaller space enclosed by the connecting plate 51313, the two adjacent limiting plates 5132 and the supporting member 5133 and abut against the limiting plate 5132, or exit through the avoiding window 51331 and the avoiding opening 51314 in sequence.

[0086] Please continue reading Figure 7 In one embodiment, one side of a plurality of connecting plates 51313 extending in the axial direction converges on the axis of the sleeve 511 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 51313 enclose the first installation space A, and two adjacent connecting plates 51313 enclose the second installation space B. The first installation space A and the second installation space B share one connecting plate 51313. In the first installation space A, a plurality of limiting pieces 5132 arranged at intervals in the axial direction are arranged on the shared connecting plate 51313. In the second installation space B, a limiting piece 5132 is provided on the other side of the common connection plate 51313, and the limiting piece 5132 is located at the far end of the connection plate 51313; and a first avoiding portion 51315 is provided on the common connection plate 51313 for the limiting portion 5122 to pass through so that the limiting portion 5122 can move in the adjacent first installation space A and second installation space B. In the two connection plates 51313 that enclose the second installation space B, a second avoiding portion 51316 is provided on the non-common connection plate 51313 for the limiting portion 5122 to pass through so that the limiting portion 5122 can move in the second installation space B and the other first installation space A.

[0087] The connecting plate 51313 and the limiting plate 5132 are arranged in the above manner. On the one hand, when the piston rod 513 is at different circumferential positions, the limiting plate 5132 and the limiting portion 5122 can quickly abut against each other, thereby facilitating operation. On the other hand, the strength of the piston rod 513 can be increased, thereby improving structural stability.

[0088] 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.

[0089] 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 axially reciprocating and circumferentially rotating along the sleeve, the piston rod comprising: a rod body, a plurality of limiting plates and a plurality of supporting members, the plurality of limiting plates are arranged on the rod body at intervals along the axial direction of the rod body, and are used to cooperate with the limiting portion to limit the piston rod, and the two ends of each supporting member are respectively against two adjacent limiting plates; 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 reciprocate 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 Each of the support members is provided with an avoidance window for the limiting portion to pass through; or, the support member has a free end, and the end surface of the limiting portion extending into the suction chamber and the end surface of the free end of the support member have a radial gap for the limiting portion to pass through.

3. The aspirator according to claim 1, characterized in that: The plurality of support members extend axially in a straight line; or, A portion of the plurality of support members extends axially on a first straight line, and another portion extends axially on a second straight line, wherein the first straight line and the second straight line are parallel; or, Two adjacent limiting pieces and the support member located between the two limiting pieces form an angle less than or equal to 90°, so that the limiting portion can abut against the limiting piece and the support member at the same time.

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 at least one of the connecting plates.

5. The aspirator according to claim 4, characterized in that: The plurality of limiting pieces 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 5, characterized in that Each of the limiting pieces and each of the supporting members are fixed on the surface of one of the two adjacent connecting plates, and each of the limiting pieces and the supporting members forms a gap with the other of the two adjacent connecting plates, and the limiting portion can pass through the gap and the supporting member in sequence and abut against the limiting piece; or, the limiting portion can pass through the gap and abut against the limiting piece; or, When 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, and each avoiding opening is located between two adjacent limiting plates in the axial direction, each of the supporting members is fixedly connected to one of the connecting plates, and the limiting portion can pass through the avoiding opening and the supporting member in sequence and abut against the limiting plate; or, the limiting portion can pass through the avoiding opening and abut against the limiting plate.

7. 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 flange is provided on the outer wall of the limiting portion, the flange abuts against the inner wall of the sleeve, and the stop portion and the flange cooperate to fix the limiting member on the sleeve.

8. 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 7; 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.

9. The suction assembly according to claim 8, 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.

10. 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 8, one end of the suction pipe away from the suction nozzle is sealed and connected to the branch pipe.

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