Double-cavity suction catheter

Abstract

The utility model provides a double-cavity suction catheter, which relates to the technical field of interventional medical instruments and comprises a first catheter, a first micro guide wire passes through the cavity of the first catheter, a second catheter is further fixedly arranged in the cavity of the first catheter, and a second micro guide wire passes through the second catheter. A suction opening is formed in the near-end tube wall of the first catheter. According to the utility model, the second catheter and the second micro guide wire are arranged in the first catheter, and when secondary suction is needed after the first micro guide wire is withdrawn, the second micro guide wire can be used for navigating and guiding the first catheter in place, so that the first micro guide wire does not need to be navigated again by spending a lot of time; the problem that micro guide wire navigation needs to be conducted again during secondary suction of an existing suction catheter is solved, a large amount of operation time can be saved, and operation risks are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of interventional medical equipment, and in particular relates to a double-lumen suction catheter. Background Art

[0002] Clinical studies have shown that thrombectomy is a very effective method for treating acute stroke. International and national medical guidelines require that patients who meet the requirements for thrombectomy interventional treatment should undergo interventional intracranial thrombus removal surgery immediately.

[0003] Currently, the main thrombectomy methods include direct aspiration technique (ADAPT) and stent retriever (SR), both of which have been proven to be very effective treatments. However, more studies have shown that ADAPT has better results than SR, can achieve the goal of recanalization faster, shorten the recanalization time, and reduce costs.

[0004] When an aspiration catheter is used for thrombectomy, the microguidewire must be removed, so if aspiration fails to clear the thrombus and navigation of the aspiration catheter is required again, the microguidewire must be re-navigated. Navigation of the microguidewire (such as in the middle cerebral artery and internal carotid artery) can take a lot of time and is not always successful. Because brain cells continue to die and brain tissue continues to be damaged unless blood supply is quickly restored, the additional time required to re-navigate the microguidewire may cause the patient to suffer a more severe stroke. A double-lumen aspiration catheter is now proposed to address the above problems. Summary of the invention

[0005] The utility model aims to provide a double-lumen suction catheter, which does not need to re-navigate the microguidewire during secondary suction, thereby saving operation time and solving the problem that the existing suction catheter needs to re-navigate the microguidewire during secondary suction.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A double-lumen suction catheter comprises a first catheter, wherein the lumen of the first catheter is used for passing a first micro-guidewire, a second catheter is fixedly arranged in the lumen of the first catheter, the second catheter is used for passing a second micro-guidewire, and a suction port is arranged at the proximal wall of the first catheter.

[0008] Preferably, a first opening is provided at a proximal end of the first catheter, and a second opening is provided at a distal end of the first catheter.

[0009] Preferably, a third opening is provided at the proximal end of the second catheter, and a fourth opening is provided at the distal end of the second catheter.

[0010] Preferably, the first conduit is provided with a first developing point at the second opening.

[0011] Preferably, the fourth opening is located at the proximal end of the second opening, and the diameter of the fourth opening is the same as the diameter of the second micro guidewire.

[0012] Preferably, a destructible seal is provided at the fourth opening.

[0013] Preferably, the first conduit is provided with a second developing point at the proximal end of the first developing point, and the second developing point corresponds to the position of the fourth opening.

[0014] Preferably, the distance between the fourth opening and the second opening is 1 cm to 3 cm.

[0015] Preferably, the first conduit is provided with a third developing point between the first developing point and the second developing point.

[0016] Preferably, the first developing point and the second developing point are developing rings, and the third developing point is a developing belt.

[0017] Beneficial effects:

[0018] (1) The utility model arranges a second catheter and a second micro-guidewire in the first catheter. When the first catheter needs to be navigated again after the first micro-guidewire is withdrawn, the second micro-guidewire can be used to navigate and guide the first catheter into place, thereby eliminating the need to spend a lot of time re-navigating the micro-guidewire and then use the micro-guidewire to navigate the first catheter, thereby solving the problem that the existing suction catheter needs to re-navigate the micro-guidewire during secondary suction.

[0019] (2) A suction port is provided on the proximal side of the first catheter, and the suction port is used to generate negative pressure in the first catheter, so that the thrombus is sucked into the first catheter, thereby solving the problem that the thrombus may enter the second catheter when the thrombus is sucked through the first opening;

[0020] (3) The utility model sets two micro-guidewires at different positions. The first micro-guidewire is used to guide the first catheter. When navigating in the blood vessel, the first micro-guidewire is located in the middle of the first catheter, which can prevent the first catheter from scraping the blood vessel wall and reduce the damage to the blood vessel wall caused by the first catheter during the navigation process. If the micro-guidewire in the second catheter is used alone for navigation, since the second catheter is far away from the axis of the first catheter and the second micro-guidewire is far away from the blood vessel wall in the blood vessel, it is easy for the first catheter to scrape the inner wall of the blood vessel, causing damage to the blood vessel wall.

[0021] (4) A developing ring is provided at the tube openings of the first tube and the second tube, and a developing belt is provided between the two developing rings, so that the position of the first tube can be more clearly located when navigating the first tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0023] Figure 1 A three-dimensional schematic diagram of a double-lumen suction catheter provided in an embodiment of the utility model.

[0024] Figure 2 This is a schematic structural diagram of a double-lumen suction catheter provided in Example 1 of the utility model.

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0026] Figure 4 It is a front view of the second opening in Example 1 of the utility model.

[0027] Figure 5 This is a schematic structural diagram of a double-lumen suction catheter provided in Example 2 of the utility model.

[0028] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0029] Figure 7 It is a front view of the second opening in Example 2 of the utility model.

[0030] Figure 8 This is a schematic structural diagram of a double-lumen suction catheter provided in Example 3 of the utility model.

[0031] Fig. 9 for Figure 8 Enlarged view of center C.

[0032] Fig.10 It is a front view of the second opening in Example 3 of the utility model.

[0033] Fig.11 This is a schematic structural diagram of a double-lumen suction catheter provided in Example 4 of the utility model.

[0034] Fig.12 for Fig.11 Enlarged view of point D in the middle.

[0035] Fig.13 It is a front view of the second opening in Example 4 of the utility model.

[0036] In the figure: 100, first conduit; 101, first opening; 102, second opening; 103, suction port; 104, first developing point; 105, third developing point; 200, second conduit; 201, third opening; 202, fourth opening; 203, second developing point; 300, first micro guidewire; 400, second micro guidewire; 500, sealing member. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0041] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0042] In the description of the present utility model, “proximal end” refers to an end close to an operator, and “distal end” refers to an end far from an operator.

[0043] The present invention will be described in detail below in conjunction with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0044] The utility model aims to solve the problem that the current suction catheter needs to be re-navigated with a micro-guidewire when performing secondary suction, and provides a double-lumen suction catheter, including a first catheter 100, wherein the diameter of the lumen of the first catheter 100 is 1.30 mm to 2.50 mm (for example, 1.30 mm, 1.40 mm, 1.50 mm, 1.60 mm, 1.70 mm, 1.80 mm, 1.90 mm, 2.00 mm, 2.10 mm, 2.20 mm, 2.30 mm, 2.40 mm). m, 2.50mm), for passing the first micro-guidewire 300, a second catheter 200 is also fixedly provided in the lumen of the first catheter 100, the lumen diameter of the second catheter 200 is 0.25mm-0.60mm (for example, 0.25mm, 0.30mm, 0.35mm, 0.40mm, 0.45mm, 0.50mm, 0.55mm, 0.60mm), for passing the second micro-guidewire 400, a suction port 103 is provided at the proximal wall of the first catheter 100.

[0045] The utility model arranges the second catheter 200 in the first catheter 100, and pre-places the second micro-guidewire 400 in the second catheter 200. When the first catheter 100 needs to be navigated again after the first micro-guidewire 300 is withdrawn, the second micro-guidewire 400 can be directly used to navigate and guide the first catheter 100 into place, thereby eliminating the need to spend a lot of time to re-navigate the first micro-guidewire 300 and then use the first micro-guidewire 300 to navigate the first catheter 100, thereby solving the problem that the existing suction catheter needs to re-navigate the micro-guidewire during secondary suction.

[0046] In a preferred embodiment of the present invention, a first opening 101 is disposed at the proximal end of the first catheter 100 , a second opening 102 is disposed at the distal end of the first catheter 100 , and a lumen is formed between the first opening 101 and the second opening 102 for passing the first micro-guidewire 300 .

[0047] In a preferred embodiment of the present invention, a third opening 201 is provided at the proximal end of the second catheter 200 , a fourth opening 202 is provided at the distal end of the second catheter 200 , and a lumen for passing the second micro-guidewire 400 is formed between the third opening 201 and the fourth opening 202 .

[0048] In a preferred embodiment of the present invention, the first catheter 100 is provided with a first developing point 104 at the second opening 102 for positioning the first catheter 100 when navigating the first catheter 100 .

[0049] In a preferred embodiment of the present invention, the fourth opening 202 is located at the proximal end of the second opening 102 , and the diameter of the fourth opening 202 is the same as the diameter of the second micro-guidewire 400 to prevent liquid from entering the second catheter 200 from the fourth opening 202 .

[0050] In a preferred embodiment of the utility model, a destructible seal 500 is provided at the fourth opening 202, which can play a sealing role when the second micro-guidewire 400 is in a standby state. When the second micro-guidewire 400 is needed, the seal 500 can be destroyed by pushing the second micro-guidewire 400, so that the second micro-guidewire 400 can extend from the fourth opening 202.

[0051] In a preferred embodiment of the utility model, the first catheter 100 is provided with a second developing point 203 at the proximal end of the first developing point 104, which is used to further improve the convenience of positioning the first catheter 100. The second developing point 203 corresponds to the position of the fourth opening 202 and can be used to determine the relative position of the second micro guidewire 400 and the fourth opening 202.

[0052] In a preferred embodiment of the present invention, the distance between the fourth opening 202 and the second opening 102 is 1 cm to 3 cm (for example, 1.0 cm, 1.2 cm, 1.4 cm, 1.5 cm, 1.6 cm, 1.8 cm, 2.0 cm, 2.2 cm, 2.4 cm, 2.5 cm, 2.6 cm, 2.8 cm, 3.0 cm).

[0053] In a preferred embodiment of the present invention, the first conduit 100 is provided with a third developing point 105 between the first developing point 104 and the second developing point 203. The first developing point 104 and the second developing point 203 are developing rings, and the third developing point 105 is a developing belt, so as to further improve the positioning accuracy of the first conduit 100.

[0054] The double-lumen suction catheter of the utility model is described in detail below through specific embodiments.

[0055] Example 1

[0056] like Figures 2 to 4 As shown, this embodiment provides a double-lumen suction catheter, specifically, comprising a first catheter 100, a first opening 101 is provided at the proximal end of the first catheter 100, a second opening 102 is provided at the distal end of the first catheter 100, a lumen is formed between the first opening 101 and the second opening 102, for passing a first micro-guidewire 300, the first micro-guidewire 300 can navigate the first catheter 100 to a target position, a suction port 103 is provided at the proximal wall of the first catheter 100, and a Luer interface is provided at the suction port 103 for connecting to a suction tool.

[0057] A second catheter 200 is also provided in the lumen of the first catheter 100. The second catheter 200 is close to the wall of the first catheter 100 and is formed integrally with the first catheter 100. A third opening 201 is provided at the proximal end of the second catheter 200, and a fourth opening 202 is provided at the distal end of the second catheter 200. A lumen is formed between the third opening 201 and the fourth opening 202. The lumen of the second catheter 200 is used to pass a second micro guidewire 400. The second micro guidewire 400 can replace the first micro guidewire 300 to navigate the first catheter 100 during secondary suction.

[0058] The diameter of the fourth opening 202 is the same as that of the second micro-guidewire 200 to prevent liquid from flowing into the second catheter 200 from the fourth opening 202 when aspirating thrombus.

[0059] In this embodiment, the axial distance between the second opening 102 and the fourth opening 202 is zero.

[0060] In order to locate the position of the first conduit 100 , the first conduit 100 is provided with a first developing point 104 at the second opening 102 , and the first developing point 104 is a developing ring.

[0061] When aspirating a thrombus, the first micro-guidewire 300 is first navigated to the treatment site, and then the first catheter 100 is pushed along the first micro-guidewire 300 so that the first micro-guidewire 300 passes through the lumen of the first catheter 100, thereby pushing the first catheter 100 to the treatment site, and then the first micro-guidewire 300 is withdrawn, the syringe is connected to the suction port 103, and the piston of the syringe is pulled outward to generate negative pressure inside the first catheter 100. This negative pressure causes the thrombus to be sucked into the lumen of the first catheter 100 and drawn into the syringe from the suction port 103, thereby achieving thrombus aspiration.

[0062] Before the first catheter 100 is pushed along the first micro-guidewire 300, the second micro-guidewire 400 is pre-inserted into the lumen of the second catheter 200 for standby use. When the first catheter 100 is pushed, the second micro-guidewire 400 is driven forward at the same time, so that when the first catheter 100 is pushed into place, the second micro-guidewire 400 is also pushed into place along with the first catheter 100, so as to save operation time.

[0063] After the aspiration is completed, the first catheter 100 is withdrawn from the treatment position. If it is found that the aspiration is not complete and there is still residual thrombus in the treatment site, the second micro-guidewire 400 can be pushed out from the fourth opening 202 and navigated to the treatment site, and then the first catheter 100 is navigated to the treatment site for a second time along the second micro-guidewire 400 to perform a second aspiration on the residual thrombus, thereby eliminating the need to re-push the first micro-guidewire 300 from the lumen of the first catheter 100 and then use the first micro-guidewire 300 to navigate the first catheter 100, thereby saving operation time.

[0064] Example 2

[0065] like Figures 5 to 7 As shown, this embodiment provides a double-lumen suction catheter, specifically, comprising a first catheter 100, a first opening 101 is provided at the proximal end of the first catheter 100, a second opening 102 is provided at the distal end of the first catheter 100, a lumen is formed between the first opening 101 and the second opening 102, the lumen is used to pass a first micro-guidewire 300, the first micro-guidewire 300 can navigate the first catheter 100 to a target position, and a suction port 103 is provided at the proximal wall of the first catheter 100.

[0066] A second catheter 200 is also provided in the lumen of the first catheter 100. The second catheter 200 is close to the wall of the first catheter 100 and is formed integrally with the first catheter 100. A third opening 201 is provided at the proximal end of the second catheter 200, and a fourth opening 202 is provided at the distal end of the second catheter 200. A lumen is formed between the third opening 201 and the fourth opening 202. The lumen of the second catheter 200 is used to pass a second micro guidewire 400. The second micro guidewire 400 can replace the first micro guidewire 300 to navigate the first catheter 100 during secondary suction.

[0067] The diameter of the fourth opening 202 is the same as that of the second micro-guidewire 200 to prevent liquid from flowing into the second catheter 200 from the fourth opening 202 when aspirating thrombus.

[0068] In order to locate the position of the first conduit 100 , the first conduit 100 is provided with a first developing point 104 at the second opening 102 , and the first developing point 104 is a developing ring.

[0069] This embodiment is improved on the basis of the embodiment 1. Specifically, the fourth opening 202 is located at the proximal end of the second opening 102, and the distance between the second opening 202 and the second opening 102 is 1 cm, so as to expand the channel area of ​​the second opening 102 and reduce the influence of the second catheter 200 occupying the lumen of the first catheter 100. At the same time, the liquid flow velocity at the second opening 102 can be reduced to be lower than the liquid flow velocity in the first catheter 100, thereby generating a pressure difference inside and outside the second opening 102, and promoting the movement of thrombus to the second opening 102.

[0070] Example 3

[0071] like Figures 8 to 10As shown, this embodiment provides a double-lumen suction catheter, specifically, comprising a first catheter 100, a first opening 101 is provided at the proximal end of the first catheter 100, a second opening 102 is provided at the distal end of the first catheter 100, a lumen is formed between the first opening 101 and the second opening 102, the lumen is used to pass a first micro-guidewire 300, the first micro-guidewire 300 can navigate the first catheter 100 to a target position, and a suction port 103 is provided at the proximal wall of the first catheter 100.

[0072] A second catheter 200 is also provided in the lumen of the first catheter 100. The second catheter 200 is close to the wall of the first catheter 100 and is formed integrally with the first catheter 100. A third opening 201 is provided at the proximal end of the second catheter 200, and a fourth opening 202 is provided at the distal end of the second catheter 200. A lumen is formed between the third opening 201 and the fourth opening 202. The lumen of the second catheter 200 is used to pass a second micro guidewire 400. The second micro guidewire 400 can replace the first micro guidewire 300 to navigate the first catheter 100 during secondary suction.

[0073] The diameter of the fourth opening 202 is the same as that of the second micro-guidewire 200 to prevent liquid from flowing into the second catheter 200 from the fourth opening 202 when aspirating thrombus.

[0074] In this embodiment, the fourth opening 202 is located at the proximal end of the second opening 102 , and the distance between the second opening 202 and the second opening 102 is 2 cm, so as to further reduce the influence of the second catheter 200 occupying the lumen of the first catheter 100 .

[0075] In order to reduce the resistance brought by the second conduit 200 , the second conduit 200 adopts a diameter-changing structure at the fourth opening 202 so that the diameter of the second conduit 200 gradually decreases toward the fourth opening 202 .

[0076] In order to locate the position of the first catheter 100, the first catheter 100 is provided with a first developing point 104 at the second opening 102, and a second developing point 203 is provided at the proximal end of the first developing point. Both the first developing point 104 and the second developing point 203 use developing rings, which can more clearly locate the position of the first catheter 100.

[0077] Example 4

[0078] like Fig.11 , 12As shown, this embodiment provides a double-lumen suction catheter, specifically, comprising a first catheter 100, a first opening 101 is provided at the proximal end of the first catheter 100, a second opening 102 is provided at the distal end of the first catheter 100, a lumen is formed between the first opening 101 and the second opening 102, the lumen is used to pass a first micro-guidewire 300, the first micro-guidewire 300 can navigate the first catheter 100 to a target position, and a suction port 103 is provided at the proximal wall of the first catheter 100.

[0079] A second catheter 200 is also provided in the lumen of the first catheter 100. The second catheter 200 is close to the wall of the first catheter 100 and is formed integrally with the first catheter 100. A third opening 201 is provided at the proximal end of the second catheter 200, and a fourth opening 202 is provided at the distal end of the second catheter 200. A lumen is formed between the third opening 201 and the fourth opening 202. The lumen of the second catheter 200 is used to pass a second micro guidewire 400. The second micro guidewire 400 can replace the first micro guidewire 300 to navigate the first catheter 100 during secondary suction.

[0080] The diameter of the fourth opening 202 is the same as that of the second micro-guidewire 200 to prevent liquid from flowing into the second catheter 200 from the fourth opening 202 when aspirating thrombus.

[0081] In this embodiment, the fourth opening 202 is located at the proximal end of the second opening 102 , and the distance between the second opening 202 and the second opening 102 is 3 cm, so as to further reduce the influence of the second catheter 200 occupying the lumen of the first catheter 100 .

[0082] In order to reduce the resistance brought by the second catheter 200, the second catheter 200 adopts a variable diameter structure at the fourth opening 202, so that the diameter of the second catheter 200 gradually decreases in the direction of the fourth opening 202, and a destructible sealing member 500 is provided at the fourth opening 202. When the second micro-guidewire 400 is not needed, the sealing member 500 seals the fourth opening 202. When secondary thrombus aspiration is required, the second micro-guidewire 400 is pushed toward the fourth opening 202 to destroy the sealing member 500, so that the second micro-guidewire 400 can extend from the fourth opening 202 for subsequent navigation work.

[0083] The sealing member 500 may be made of metal foil, such as tin foil, aluminum foil, etc., or may be made of biodegradable materials, such as polyglycolic acid (PGA), polylactic acid (PLA), polylactic acid-glycolic acid copolymer (PLGA), etc.

[0084] In order to locate the position of the first catheter 100, the first catheter 100 is provided with a first developing point 104 at the second opening 102, and a second developing point 203 is provided at the proximal end of the first developing point. The first catheter 100 is also provided with a third developing point 105 between the first developing point 104 and the second developing point 203. The first developing point 104 and the second developing point 203 both use developing rings, and the third developing point 105 is a developing belt, which can more clearly locate the position of the first catheter 100.

[0085] In summary:

[0086] The double-lumen suction catheter provided by the utility model can use the first micro-guidewire 300 to navigate the catheter into place to complete the first suction, and can also use the second micro-guidewire 400 to perform secondary navigation after withdrawing the first micro-guidewire 300 to perform secondary suction, thereby solving the problem of the existing suction catheter requiring re-micro-guidewire navigation during secondary suction, thereby shortening the operation time and avoiding the problem of the catheter scraping the blood vessel wall when the second micro-guidewire 400 is used alone for navigation.

[0087] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A double-lumen suction catheter, comprising a first catheter, wherein the lumen of the first catheter is used to pass a first micro-guidewire, characterized in that: A second catheter is fixedly arranged in the lumen of the first catheter, and the second catheter is used for passing a second micro-guide wire. A suction port is arranged at the proximal wall of the first catheter.

2. A double-lumen suction catheter according to claim 1, characterized in that: The proximal end of the first catheter is provided with a first opening, and the distal end of the first catheter is provided with a second opening.

3. A double-lumen suction catheter according to claim 1 or 2, characterized in that: The proximal end of the second catheter is provided with a third opening, and the distal end of the second catheter is provided with a fourth opening.

4. A double-lumen suction catheter according to claim 3, characterized in that: The first conduit is provided with a first developing point at the second opening.

5. A double-lumen suction catheter according to claim 3, characterized in that: The fourth opening is located at the proximal end of the second opening, and the diameter of the fourth opening is the same as the diameter of the second micro guide wire.

6. A double-lumen suction catheter according to claim 5, characterized in that: A destructible sealing member is provided at the fourth opening.

7. A double-lumen suction catheter according to claim 5, characterized in that: The first conduit is provided with a second developing point at the proximal end of the first developing point, and the second developing point corresponds to the position of the fourth opening.

8. A double-lumen suction catheter according to claim 6, characterized in that: The distance between the fourth opening and the second opening is 1 cm to 3 cm.

9. A double-lumen suction catheter according to claim 7, characterized in that: The first conduit is provided with a third developing point between the first developing point and the second developing point.

10. A double-lumen suction catheter according to claim 9, characterized in that: The first developing point and the second developing point are developing rings, and the third developing point is a developing belt.

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