Expandable suction catheter and suction device

Abstract

The utility model relates to the technical field of medical instruments, and discloses an expandable suction catheter and a suction device.The expandable suction catheter comprises a pipe fitting, the pipe fitting comprises an inner core and an outer pipe, the inner core and the outer pipe are arranged in a sliding mode in the axial direction of the outer pipe, the pipe fitting is communicated with negative pressure equipment, the pipe fitting comprises the outer pipe and the inner core, a pipe cavity is formed in the outer pipe, and the inner core is arranged in the pipe cavity. The inner core is arranged in the pipe cavity; the suction cover is fixedly arranged at the far end of the inner core and has a storage state and an unfolding state, in the unfolding state, the suction cover is in a horn shape, the small-diameter end of the suction cover is connected with the far end of the inner core, the suction cover is used for forming range negative pressure at an opening of the large-diameter end of the suction cover, and in the storage state, the suction cover is folded and located on the inner side of the outer pipe; when the suction cover is located on the outer side of the outer tube, the suction cover is converted into an unfolded state, and the problems that thrombus can be quickly sucked in the operation process, thrombus scraps are prevented from being separated and transferred along with blood flow, and the health of a patient is threatened are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely relates to a kind of expandable suction catheter and suction device. BACKGROUND

[0002] Thrombus is in the heart and blood vessel of living body, blood coagulation occurs, or some analysis in blood and coagulation forms solid mass of pathological change, when thrombus is located in important blood flow passage such as nerve blood vessel, can cause stroke, arteriosclerosis etc., limit blood flow in blood vessel, cause various blood vessel diseases, seriously endanger patient health. At present, the method for treating thrombus mainly includes two kinds of drug treatment and physical dredging, drug treatment mainly uses thrombolytic drugs, antiplatelet drugs and anticoagulants, the purpose is to make thrombus dissolve and separate from the affected area, however this treatment can affect patient's blood clotting level, and is not suitable for all patients, for example, when patient's platelet level is low, it is easy to increase patient's bleeding risk, and needs to be used carefully. And another physical dredging method mainly relies on surgical instruments into blood vessel, adopts mechanical physical contact means, removes thrombus from blood vessel wall, and removes thrombus from patient's body through catheter instrument, and the application range is relatively more extensive, and it is not easy to aggravate patient's bleeding risk. However, in the physical method dredging mode, due to the adoption of instrument physical contact to remove thrombus, part of thrombus is easy to form debris and be washed away by blood flow under the action of blood flow flushing and physical contact and other factors during thrombus detachment, and the thrombus debris washed away is easy to block other blood vessels or adhere to the inner wall of other positions in blood vessel as the coagulation basis of new thrombus, causing thrombus recurrence.

[0003] In related art, the interception net formed by setting memory metal on the guide wire is opened when the guide wire enters the blood vessel and reaches the lesion position, and the thrombus debris detached from the thrombus is shielded, so as to reduce the situation that the debris is transferred with blood flow, and after completing thrombectomy, the guide wire is used to remove the interception net and thrombus debris on the interception net from the blood vessel.

[0004] However, in the above related art, the purpose of quickly removing thrombus cannot be achieved, and there is still the risk of thrombus detachment, threatening patient health. UTILITY MODEL CONTENT

[0005] Therefore, the utility model provides a kind of expandable suction catheter and suction device to solve the problem that thrombus debris is separated from subject and is transferred with blood flow in the process of operation, threatens patient health.

[0006] The utility model provides a kind of expandable suction catheter, comprising: pipe fitting, with the proximal end close to operator and the distal end away from operator, the pipe fitting includes inner core and outer tube, the inner core with the outer tube is axially slidably arranged along the outer tube, the pipe fitting is communicated with negative pressure equipment, the pipe fitting includes outer tube and inner core, the outer tube is equipped with lumen inside, the inner core is located in the lumen;Suction cover, fixedly arranged at the distal end of the inner core, with storage state and unfolded state, in the unfolded state, the suction cover is horn-shaped and the smaller end of the diameter of the suction cover is connected with the distal end of the inner core, the suction cover is used to form range negative pressure at the opening of the larger end of the diameter of the suction cover, in the storage state, the suction cover is folded and located inside the outer tube, in the case that the suction cover is located outside the outer tube, the suction cover changes into the unfolded state.

[0007] Beneficial effect: pipe fitting is used to extend into patient's blood vessel, inner core and outer tube are slidably arranged, and suction cover is arranged at the end of inner core. In the process that the distal end of pipe fitting extends into blood vessel and extends to the affected part, the suction cover is stored in the lumen of outer tube. After the distal end of pipe fitting reaches the affected part, the operator pulls the outer tube, so that the outer tube and the inner core slide relative to each other, and the suction cover is exposed from the distal end of the outer tube. After the suction cover is exposed from the outer tube, it changes from the storage state to the unfolded state to form a horn shape. Since the pipe fitting is communicated with the negative pressure equipment, the negative pressure generated by the negative pressure equipment is transmitted through the pipe fitting and acts on the horn-shaped opening of the suction cover to suck the thrombus and thrombus fragments, preventing the thrombus from being transferred with the blood flow and causing health risks to the patient.

[0008] In an optional embodiment, the suction cover is a flexible memory alloy framework. In the storage state, the flexible memory alloy framework is folded. In the case that the suction cover is located outside the outer tube, the flexible memory alloy framework is in the unfolded state. In an optional embodiment, the suction cover includes a flexible memory framework and a sealing layer. The sealing layer is the same shape as the flexible memory framework and is fixedly arranged on the flexible memory framework. The sealing layer is attached to the outer side of the flexible memory framework.

[0009] Beneficial effect: by arranging the flexible memory framework and the sealing layer, the flexible memory framework is pre-set to be horn-shaped. When the suction cover is in the storage state and located inside the outer tube, the flexible memory framework is limited by the wall of the outer tube and is arranged in a folded state. After the suction cover is exposed from the outer tube, the flexible memory framework loses the limitation of the wall of the outer tube and gradually expands to recover its shape, so that the suction cover changes to the unfolded state. The sealing layer is attached to the flexible memory framework to shield the surface of the unfolded flexible memory framework, preventing the negative pressure from spreading through the gaps of the flexible memory framework, avoiding the dispersion and weakening of the negative pressure at the opening end of the suction cover, ensuring the stable suction of the suction cover on the thrombus fragments, further reducing the escape of the thrombus fragments and the safety risks to the patient, and improving the reliability of the device.

[0010] In an alternative embodiment, the suction cover comprises an elastic memory framework and a sealing layer, the sealing layer is the same shape as the elastic memory framework and is fixed on the elastic memory framework, and the sealing layer is attached to the inner side of the memory framework.

[0011] Beneficial effects: By setting the elastic memory framework and the sealing layer, the elastic memory framework is preset to be trumpet-shaped. When the suction cover is in the storage state and located in the appearance, the elastic memory framework is limited by the wall of the outer tube and is folded. When the suction cover is exposed outside the outer tube, the elastic memory framework gradually expands and recovers its shape, so that the suction cover becomes an expanded state. The sealing layer is attached to the elastic memory framework, which covers the surface of the expanded elastic memory framework to prevent the negative pressure from spreading through the gaps of the elastic memory framework, thereby avoiding the dispersion and weakening of the negative pressure at the opening end of the suction cover, ensuring the stable suction of the suction cover to the thrombus fragments, further reducing the risk of thrombus fragments escaping and causing safety hazards to patients, and improving the reliability of the device. At the same time, since the sealing layer is located inside the trumpet-shaped elastic memory framework, the washing effect of blood flow on the sealing layer is reduced, the risk of the sealing layer falling off is reduced, and the reliability of the device is improved.

[0012] In an alternative embodiment, in the expanded state, the trumpet-shaped suction cover comprises a support part and an expansion part, the support part is connected with the end part of the inner core and extends along the radial direction to the periphery of the inner core to form a ring, and the expansion part is funnel-shaped and connected with the periphery edge of the support part, and the diameter of the expansion part gradually increases in the direction away from the end part of the inner core.

[0013] Beneficial effects: Since the suction cover is divided into a support part and an expansion part, the support part and the expansion part together form a trumpet-shaped structure. The support part is directly connected with the inner core, and a bent corner is formed at the connection between the support part and the expansion part. The expansion part is funnel-shaped and expands outward, increasing the range of negative pressure suction. Compared with a simple funnel-shaped structure, the formed corner structure can improve the overall strength of the suction cover, reduce the possibility of deformation of the suction cover under the influence of blood flow, negative pressure or thrombus extrusion, thereby reducing the possibility of weakening of the suction effect, reduction of the suction range, or even occlusion of the opening, and improving the stability of the structure.

[0014] In an alternative embodiment, the inner core is a pipe, and in the expanded state, the end of the suction cover with smaller diameter is connected with the pipe opening of the inner core, and the proximal end of the inner core is in communication with the negative pressure device.

[0015] Beneficial effects: The inner core can be a pipe, and the inner core is directly connected with the negative pressure device, which plays the role of connecting the suction cover and transmitting the negative pressure. The negative pressure is directly transmitted to the suction cover through the inner core to suck the thrombus debris.

[0016] In an alternative embodiment, the inner core is a wire, the inner core end is fixedly connected with the circumferential sidewall of the suction cover, in the unfolded state, the supporting part abuts against the outer tube end, and the opening with smaller diameter of the suction cover is in communication with the lumen of the outer tube, and the proximal end of the outer tube is in communication with the negative pressure device.

[0017] Beneficial effects: the inner core is a wire, which serves to connect the suction cover, and the outer tube is in communication with the negative pressure device, which serves to deliver negative pressure, in the unfolded state of the suction cover, the opening with smaller diameter of the suction cover abuts against the outer tube, so as to deliver negative pressure from the opening with smaller diameter of the suction cover to the suction cover.

[0018] In an alternative embodiment, the proximal end of the tube further comprises a handle and an operating part, the operating part is fixedly arranged at the proximal end of the inner core and fixedly connected with the handle, the inner core passes through the handle, and the outer tube is sleeved on the circumferential side of the inner core and located at the side of the handle away from the operating part.

[0019] Beneficial effects: through the arrangement of the handle and the operating part, the operating part connects the inner core with the handle and provides a structural basis for the connection of the inner core with the negative pressure device, and the handle provides a position convenient for the operator to hold, so as to facilitate the operator to push or pull the outer tube, thereby improving the convenience of the device.

[0020] In an alternative embodiment, the outer tube comprises a sliding tube and a stress relief sleeve, the stress relief sleeve is sleeved and fixed on the outer side of the sliding tube, and the proximal end of the sliding tube passes into the handle and is in sliding fit with the handle.

[0021] Beneficial effects: the outer tube comprises the stress relief sleeve and the sliding tube, the stress relief sleeve is sleeved on the outer side of the sliding tube, so that the local hardness of the outer tube is improved, the part of the outer tube inside the human body vessel has higher hardness, and the posture is more stable. At the same time, it is convenient for the tube to extend into the vessel, the outer tube is in sliding fit with the handle, so that the outer tube can partially extend into the handle, and thus when the operator pushes or pulls the outer tube, it is ensured that the outer tube can always wrap outside the inner core on the part of the tube outside the handle, so as to protect the inner core.

[0022] In an alternative embodiment, the proximal end of the stress relief sleeve is provided with a limiting part, in the unfolded state, the limiting part abuts against the handle, and in the storage state, the limiting part is separated from the handle.

[0023] Beneficial effects: by setting the limiting part, the limiting part is located on the side of the stress relief sleeve, thereby limiting the relative movement distance between the outer tube and the inner core when the operator pulls the outer tube, so that when the operator pulls the outer tube, the suction cover can be exposed outside the outer tube, and the suction cover is also avoided from being completely separated from the outer tube, the transmission of negative pressure is invalid, or the inner core is avoided from being excessively exposed outside the outer tube.

[0024] In a second aspect, the utility model also provides a kind of suction device, comprising: the expandable suction catheter described above;Negative pressure equipment, with the proximal end of the pipe piece is communicated.

[0025] Beneficial effects: the suction device is expanded by using the above-mentioned expandable suction catheter, so that the negative pressure device is linked with the suction cover, and the thrombus and thrombus debris are collected during the thrombus removal operation, so as to avoid the thrombus from being transferred with blood flow during the operation, and to avoid the situation that the patient safety hidden trouble is caused. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0027] Figure 1 The cross-sectional view of the whole structure in the expanded state of the expandable suction catheter of the embodiment of the utility model is shown.

[0028] Figure 2 The cross-sectional view of the structure of the elastic memory framework and the sealing layer of the expandable suction catheter of the embodiment of the utility model is shown.

[0029] Figure 3 The cross-sectional view of the structure of the sealing layer and the elastic memory framework of another expandable suction catheter of the embodiment of the utility model is shown.

[0030] Figure 4 The cross-sectional view of the whole structure in the storage state of the expandable suction catheter of the embodiment of the utility model is shown.

[0031] MARKS OF THE DRAWINGS:

[0032] 100, pipe piece; 101, outer tube; 1011, sliding tube; 1012, stress relief sleeve; 102, inner core; 103, limiting part; 200, suction cover; 201, elastic memory framework; 202, sealing layer; 203, supporting part; 204, expansion part; 300, handle; 400, operating part. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0034] The embodiments of the utility model will be described below in combination with Figures 1 to 4 .

[0035] According to the embodiments of the utility model, on the one hand, a dilatable suction catheter is provided. Please refer to Figure 1 and Figure 4 , which comprises a pipe 100 and a suction cover 200. The pipe 100 has a proximal end close to an operator and a distal end away from the operator. The pipe comprises an inner core 102 and an outer tube 101. The inner core 102 is axially slidingly arranged with the outer tube 101. The pipe 100 is in communication with a negative pressure device. The pipe 100 comprises the outer tube 101 and the inner core 102. The inner tube 101 is internally provided with a lumen. The inner core 102 is arranged in the lumen. The suction cover 200 is fixedly arranged at the distal end of the inner core 102. The suction cover 200 has a storage state and an unfolded state. In the unfolded state, the suction cover 200 is in a horn shape. The end of the suction cover 200 with a smaller diameter is connected with the distal end of the inner core 102. The suction cover 200 is used to form a range of negative pressure at the opening of the end of the suction cover 200 with a larger diameter. In the storage state, the suction cover 200 is folded and located inside the outer tube 101. In the case that the suction cover 200 is located outside the outer tube 101, the suction cover 200 is changed to the unfolded state.

[0036] In the embodiments, the pipe 100 is used to extend into the blood vessel of a patient. The inner core 102 is slidingly arranged with the outer tube 101. The suction cover 200 is arranged at the end of the inner core 102. In the process that the distal end of the pipe 100 extends into the blood vessel and extends to the affected part, the suction cover 200 is stored inside the lumen of the outer tube 101. After the distal end of the pipe 100 reaches the affected part, the operator pulls the outer tube 101, so that the outer tube 101 relatively slides with the inner core 102 and the suction cover 200 is exposed from the distal end of the outer tube 101. After the suction cover 200 is exposed from the outer tube 101, the suction cover 200 is changed from the storage state to the unfolded state to form a horn shape. Since the pipe 100 is in communication with the negative pressure device, the negative pressure generated by the negative pressure device is transmitted through the pipe 100 and acts on the horn-shaped opening of the suction cover 200, so that the thrombus fragments are sucked, the thrombus is prevented from transferring with the blood flow, and the situation that the patient's health is hidden is prevented.

[0037] In the above embodiments, specifically, one end of the tube 100 for extending into the blood vessel and reaching the lesion site is the distal end, and the other end is the proximal end. The outer tube 101 of the tube 100 slides relative to the inner core 102. The inner core 102 can be a tube with a lumen. The proximal end of the inner core 102 is in communication with the negative pressure device, and the distal end is in communication with the suction cover 200. The negative pressure is transmitted through the inner core 102, so that the thrombus body and thrombus debris are absorbed and concentrated by the suction cover 200, avoiding the transfer of thrombus debris.

[0038] In addition, it should be noted that in the storage state, the inner core 102 is completely covered inside the outer tube 101, and the suction cover 200 is also stored in the outer tube 101 and is limited by the inner wall of the outer tube 101, so that the suction cover 200 is folded. When the operator pulls the outer tube 101 to move the outer tube 101 relative to the inner core 102 towards the proximal end of the tube 100, the suction cover 200 is exposed outside the outer tube 101. The suction cover 200 is provided with a memory metal structure. For example, the memory metal structure can be a braided nickel-titanium mesh basket. When the suction cover 200 is exposed outside the outer tube 101 and loses the limitation of the tube wall, the suction cover 200 gradually opens under the action of the memory metal structure and restores to a trumpet shape. After the thrombus removal operation is completed, the operator pushes the outer tube 101 to press the outer wall of the suction cover 200, so as to force the suction cover 200 to deform and re-fold into the inside of the outer tube 101, facilitating the withdrawal of the tube 100 from the blood vessel.

[0039] In one embodiment, referring to Figure 2 The suction cover 200 includes an elastic memory skeleton 201 and a sealing layer 202. The sealing layer 202 has the same shape as the elastic memory skeleton 201 and is fixedly arranged on the elastic memory skeleton 201. The sealing layer 202 is attached to the outside of the elastic memory skeleton 201.

[0040] Specifically, the elastic memory skeleton 201 is made of a memory metal material. For example, the elastic memory skeleton 201 is a nickel-titanium mesh basket. The sealing layer 202 is made of a non-toxic polymer material. The sealing layer 202 is fixedly connected to the elastic memory skeleton 201 at multiple points in the circumferential direction. The connection mode can be adhesion or the nickel-titanium wire used to make the elastic memory skeleton 201 can partially pass through the sealing layer 202, thereby fixing the sealing layer 202 on the elastic memory skeleton 201.

[0041] In this embodiment, by setting an elastic memory skeleton 201 and a sealing layer 202, the elastic memory skeleton 201 is preset to be funnel-shaped. When the suction mask 200 is in the stored state and located inside the outer surface, the elastic memory skeleton 201 is limited by the wall of the outer tube 101 and thus folded. After the suction mask 200 is exposed from the outer tube 101, it loses the limitation of the outer tube 101 wall and gradually unfolds to restore its shape, so that the suction mask 200 is in the unfolded state. The sealing layer 202 is attached to the elastic memory skeleton 201 and covers the surface of the unfolded elastic memory skeleton 201 to prevent negative pressure from spreading from the gaps in the elastic memory skeleton 201. This avoids the dispersion and weakening of negative pressure at the opening end of the suction mask 200, ensuring stable suction of thrombus fragments by the suction mask 200, further reducing the possibility of thrombus fragments escaping and causing safety hazards to patients, and improving the reliability of the device.

[0042] In another embodiment, please refer to Figure 3 The suction cover 200 includes an elastic memory frame 201 and a sealing layer 202. The sealing layer 202 has the same shape as the elastic memory frame 201 and is fixed on the elastic memory frame 201. The sealing layer 202 is attached to the inside of the memory frame.

[0043] In this embodiment, by setting an elastic memory skeleton 201 and a sealing layer 202, the elastic memory skeleton 201 is preset to be trumpet-shaped. When the suction cover 200 is in the stored state and located inside the outer casing, the elastic memory skeleton 201 is folded due to the limitation of the outer tube 101 wall. After the suction cover 200 is exposed from the outer tube 101, it loses the limitation of the outer tube 101 wall and gradually unfolds to restore its shape, so that the suction cover 200 is in the unfolded state. The sealing layer 202 is attached to the elastic memory skeleton 201, which provides sealing for the unfolded elastic memory skeleton 201. 1. The surface is shielded to prevent negative pressure from spreading through the gaps in the elastic memory skeleton 201, thereby avoiding the dispersion and weakening of negative pressure at the opening of the suction mask 200. This ensures stable suction of thrombus fragments by the suction mask 200, further reducing the risk of thrombus fragments escaping and causing safety hazards to patients, and improving the reliability of the device. At the same time, since the sealing layer 202 is located inside the funnel shape formed by the elastic memory skeleton 201, it can reduce the scouring effect of blood flow on the sealing layer 202, reduce the risk of the sealing layer 202 falling off, and improve the reliability of the device.

[0044] In one embodiment, in the unfolded state, the horn-shaped suction cover 200 includes a support portion 203 and an expansion portion 204. The support portion 203 is connected to the end of the inner core 102 and extends radially toward the periphery of the inner core 102 in an annular shape. The expansion portion 204 is funnel-shaped and connected to the periphery edge of the support portion 203. The diameter of the expansion portion 204 gradually increases in the direction away from the end of the inner core 102.

[0045] Specifically, the support part 203 and the expansion part 204 are integrally formed by woven nickel-titanium metal wires, and the inner core 102 can be formed into a tube by woven nickel-titanium metal wires and integrally woven with the suction cover 200.

[0046] In this embodiment, the suction cover 200 is divided into a support part 203 and an expansion part 204. The support part 203 and the expansion part 204 together form a funnel-shaped structure. The support part 203 is directly connected to the inner core 102, and a bend is formed at the connection with the expansion part 204. The expansion part 204 expands outward in a funnel shape, which increases the range of negative pressure suction. Compared with a simple funnel shape, the corner structure formed can improve the overall strength of the suction cover 200 and reduce the possibility of deformation of the suction cover 200 under the influence of blood flow, negative pressure or thrombus compression. This reduces the possibility of weakened suction effect, reduced suction range or even blocked opening, and improves the stability of the structure.

[0047] In one embodiment, the inner core 102 is a pipe. In the unfolded state, the smaller diameter end of the suction hood 200 is connected to the port of the inner core 102, and the proximal port of the inner core 102 is connected to a negative pressure device.

[0048] In this embodiment, the inner core 102 can be a pipe, and the inner core 102 is directly connected to the negative pressure device, while also serving to connect the suction hood 200 and transmit negative pressure. The negative pressure is directly transmitted to the suction hood 200 through the inner core 102 to suction the thrombus fragments.

[0049] In another embodiment, the inner core 102 is a filament, and the end of the inner core 102 is fixedly connected to the peripheral sidewall of the suction cover 200. In the unfolded state, the support part 203 abuts against the end of the outer tube 101, and the opening of the smaller diameter end of the suction cover 200 is connected to the cavity of the outer tube 101. The proximal end of the outer tube 101 is connected to the negative pressure device.

[0050] Specifically, when the inner core 102 is a filament, the outer tube 101 serves as a channel for transmitting negative pressure, while the inner core 102 only serves as a structure for connecting the suction cover 200. At this time, the smaller end of the horn-shaped suction cover 200 is connected to the cavity of the outer tube 101, and the support part 203 of the suction cover 200 rests against the opening of the outer tube 101.

[0051] In this embodiment, the inner core 102 is a filament that serves to connect the suction hood 200, while the outer tube 101 is connected to the negative pressure device and serves to transmit negative pressure. When the suction hood 200 is in the unfolded state, the smaller diameter opening of the suction hood 200 abuts against the outer tube 101, thereby transmitting negative pressure from the smaller diameter opening of the suction hood 200 to the suction hood 200.

[0052] In one embodiment, the proximal end of the fitting 100 further includes a handle 300 and an operating part 400. The operating part 400 is fixedly disposed at the proximal end of the inner core 102 and fixedly connected to the handle 300. The inner core 102 passes through the handle 300, and the outer tube 101 is sleeved around the inner core 102 and located on the side of the handle 300 away from the operating part 400.

[0053] In this embodiment, through the arrangement of the handle 300 and the operating part 400, the operating part 400 connects the inner core 102 to the handle 300 and provides a structural basis for the connection between the inner core 102 and the negative pressure device. The handle 300 provides an easy gripping position for the operator, thereby facilitating the operator to push or pull the outer tube 101, thus improving the convenience of the device.

[0054] In one embodiment, the outer tube 101 includes a sliding tube 1011 and a stress-relieving sleeve 1012. The stress-relieving sleeve 1012 is fitted and fixed to the outside of the sliding tube 1011. The proximal end of the sliding tube 1011 passes through the handle 300 and slides with the handle 300.

[0055] In this embodiment, the outer tube 101 includes a stress-relieving sleeve 1012 and a sliding tube 1011. The stress-relieving sleeve 1012 is fitted over the sliding tube 1011, increasing the local hardness of the outer tube 101 and making the portion of the outer tube 101 inside the blood vessel more rigid, thus improving its stability. Simultaneously, it facilitates the insertion of the fitting 100 into the blood vessel. The outer tube 101 slides within the handle 300, allowing it to partially extend into the handle 300. Therefore, when the operator pushes or pulls the outer tube 101, it ensures that when the fitting 100 is outside the handle 300, the outer tube 101 always wraps around the inner core 102, protecting the inner core 102.

[0056] In one embodiment, the stress-relieving sleeve 1012 has a limiting part 103 at its proximal end. In the unfolded state, the limiting part 103 abuts against the handle 300, and in the retracted state, the limiting part 103 separates from the handle 300.

[0057] In this embodiment, by setting a limiting part 103, which is located on the periphery of the stress-relieving sleeve 1012, the relative movement distance between the outer tube 101 and the inner core 102 is limited when the operator pulls the outer tube 101. This ensures that when the operator pulls the outer tube 101, the suction cover 200 can be exposed outside the outer tube 101, while also preventing the suction cover 200 from completely separating from the outer tube 101, thus avoiding the failure of negative pressure transmission, or preventing excessive exposure of the inner core 102 outside the outer tube 101.

[0058] According to an embodiment of the present invention, another aspect provides a suction device, comprising: the aforementioned expandable suction conduit; and a negative pressure device connected to the proximal end of the fitting 100.

[0059] In this embodiment, the suction device uses the aforementioned expandable suction catheter to link the negative pressure device with the suction hood 200. During the thrombus removal surgery, the thrombus and thrombus fragments are suctioned and collected to prevent the thrombus from being transferred with the blood flow during the surgery, thus avoiding potential safety hazards to the patient.

[0060] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An expandable suction catheter, comprising: The application relates to a negative pressure device, which comprises the following parts: a pipe element with a proximal end close to an operator and a distal end away from the operator, the pipe element comprising an inner core and an outer pipe, the inner core being arranged in axial sliding with the outer pipe along the outer pipe, the pipe element being communicated with a negative pressure device, the inner pipe being provided with a pipe cavity inside, and the inner core being arranged in the pipe cavity; a suction cover fixedly arranged at the distal end of the inner core and having a storage state and an unfolded state, in the unfolded state, the suction cover is in a horn shape, and one end of the suction cover with a smaller diameter is connected with the distal end of the inner core, the suction cover is used for forming a range negative pressure at the other end of the suction cover with a larger diameter, in the storage state, the suction cover is folded and located inside the outer pipe, and the suction cover is turned into the unfolded state when the suction cover is located outside the outer pipe.

2. The expandable suction catheter of claim 1, wherein, The suction cover is an elastic memory alloy framework, in the storage state, the elastic memory alloy framework is folded, and in the case that the suction cover is located outside the outer pipe, the elastic memory alloy framework is in the unfolded state.

3. The expandable suction catheter of claim 1, wherein, The suction cover comprises an elastic memory framework and a sealing layer, the sealing layer is the same in shape as the elastic memory framework and is fixedly arranged on the elastic memory framework, and the sealing layer is attached to the inner side of the memory framework.

4. The expandable suction catheter of claim 2 or 3, wherein, In the unfolded state, the horn-shaped suction cover comprises a supporting part and an expanding part, the supporting part is connected with the end part of the inner core and extends along the radial direction to the periphery of the inner core in a ring shape, the expanding part is in a funnel shape and is connected with the periphery edge of the supporting part, and the diameter of the expanding part gradually increases in the direction away from the end part of the inner core.

5. The expandable suction catheter of claim 4, wherein, The inner core is a pipe, in the unfolded state, one end of the suction cover with a smaller diameter is connected with the pipe opening of the inner core, and the proximal pipe opening of the inner core is communicated with the negative pressure device.

6. The expandable suction catheter of claim 4, wherein, The inner core is a wire-shaped element, the end part of the inner core is fixedly connected with the periphery side wall of the suction cover, in the unfolded state, the supporting part is in abutment with the end part of the outer pipe, one end of the suction cover with a smaller diameter is communicated with the pipe cavity of the outer pipe, and the proximal end of the outer pipe is communicated with the negative pressure device.

7. The expandable suction catheter of claim 1, wherein, The proximal end of the pipe element further comprises a handle and an operating part, the operating part is fixedly arranged at the proximal end of the inner core and is fixedly connected with the handle, the inner core penetrates through the handle, and the outer pipe is sleeved on the periphery of the inner core and is located on the side of the handle away from the operating part.

8. The expandable suction catheter of claim 7, wherein, The outer pipe comprises a sliding pipe and a stress relief sleeve, the stress relief sleeve is sleeved and fixed on the outer side of the sliding pipe, and the proximal end of the sliding pipe penetrates into the handle and is in sliding fit with the handle.

9. The expandable suction catheter of claim 8, wherein, The proximal end of the stress relief sleeve is provided with a limiting part, in the unfolded state, the limiting part is in abutment with the handle, and in the storage state, the limiting part is separated from the handle.

10. A suction device, characterized in that The application further relates to an expandable suction catheter and a negative pressure device. The expandable suction catheter is any one of claims 1 to 9. The negative pressure device is communicated with the proximal end of the pipe element.

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