Three-channel negative pressure catheter

Abstract

The utility model discloses a three-channel negative pressure catheter, which relates to the technical field of medical instruments, and comprises an outer sheath tube, a valve body and a negative pressure suction device, the outer sheath tube is fixedly connected with the valve body; the valve body comprises a main channel, an auxiliary channel and a negative pressure channel used for being connected with a negative pressure suction device, one end of the main channel is communicated with the outer sheath tube, and the auxiliary channel and the negative pressure channel are arranged on the two sides of the main channel respectively. A guide structure used for guiding an instrument penetrating through the auxiliary channel to enter the main channel is arranged at the intersection position of the auxiliary channel and the main channel. According to the utility model, the auxiliary channel is arranged on the valve body, so that an interventional medical instrument can be independently arranged in a penetrating manner, and meanwhile, the interventional medical instrument can also be arranged in the main channel in a penetrating manner, so that two medical instruments can be simultaneously intervened, and meanwhile, a negative pressure suction device can be connected through the negative pressure channel to perform negative pressure suction treatment; and another instrument does not need to be withdrawn and replaced after one instrument is penetrated, so that the operation complexity is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a three-channel negative pressure catheter. Background Technology

[0002] One current method for treating thrombosis is to use the principle of negative pressure aspiration, which involves suctioning out the thrombus through a thrombus aspiration catheter. The aspiration catheter is equipped with a three-way valve, which facilitates connection to devices that generate negative pressure and the insertion of relevant interventional medical devices.

[0003] Currently available negative pressure catheters equipped with three-way valves rely on inserting one device through the main channel, removing it after use, and then inserting another device for the same procedure, repeating this cycle. For example, in pulmonary thrombectomy, an external sheath is needed to provide vascular access and a delivery channel. An angiography catheter is then inserted into the external sheath to assess the degree of endovascular embolism and the vessel's course. Afterward, the angiography catheter is removed, and a thrombectomy stent system is inserted to perform the thrombectomy.

[0004] The shortcomings of existing negative pressure catheters are as follows: because the three-way valve of existing negative pressure catheters can only insert instruments through the main channel, other channels can only be used for drug injection or aspiration, and cannot insert two instruments at the same time. However, many surgeries require two instruments to be used in conjunction with each other in the catheter. For example, the pulmonary thrombectomy mentioned above requires the simultaneous intervention of angiography catheter and thrombectomy catheter, which existing catheters cannot meet, resulting in cumbersome, inconvenient and inefficient operation. In addition, the aspiration port of existing negative pressure catheters is generally designed with Luer interface, which has a relatively small diameter and is easily blocked by thrombi, thus failing to complete the negative pressure aspiration function. Utility Model Content

[0005] The purpose of this invention is to provide a three-channel negative pressure catheter to solve the technical problem that the existing negative pressure catheter is not convenient for simultaneous insertion of two instruments, resulting in cumbersome and inconvenient operation.

[0006] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0007] A three-channel negative pressure conduit includes an outer sheath, a valve body, and a negative pressure suction device, wherein the outer sheath is fixedly connected to the valve body;

[0008] The valve body includes a main channel, an auxiliary channel, and a negative pressure channel for connecting a negative pressure suction device. One end of the main channel is connected to the outer sheath tube, and the auxiliary channel and the negative pressure channel are respectively located on both sides of the main channel.

[0009] A guide structure is provided at the intersection of the auxiliary channel and the main channel to guide instruments that pass through the auxiliary channel into the main channel.

[0010] As a further embodiment of this utility model: the guiding mechanism includes an arc-shaped guide plate and an elastic adjustment mechanism. The arc-shaped guide plate is fixedly installed on one side of the intersection of the auxiliary channel and the main channel, and the elastic adjustment mechanism is installed on the other side of the intersection of the auxiliary channel and the main channel.

[0011] As a further embodiment of this utility model: the elastic adjustment mechanism includes an installation port and an elastic rubber diaphragm. The installation port is located at the intersection of the auxiliary channel and the main channel. The elastic rubber diaphragm is closed and connected inside the installation port. A pull bolt is fixedly connected to the side of the elastic rubber diaphragm facing the outside of the valve body.

[0012] As a further embodiment of this utility model, sealing valves are provided at the end of the main channel away from the outer sheath and at the end of the auxiliary channel away from the main channel.

[0013] As a further embodiment of this utility model: the sealing valve includes a valve cover and a sealing valve plate, the sealing valve plate is stepped, the valve cover is used to fix and press the sealing valve plate, and the valve cover has a through hole.

[0014] As a further embodiment of this utility model: a first cut is provided on one side of the sealing valve plate, and a second cut perpendicular to the first cut is provided on the other side, and a through hole is provided at the intersection of the first cut and the second cut.

[0015] As a further embodiment of this utility model: the negative pressure suction device includes an extension tube, a control valve, and a connector for connecting to a negative pressure source. One end of the extension tube is connected to a negative pressure channel, and the other end is fixedly connected to the connector. The control valve is installed on the extension tube.

[0016] As a further embodiment of this utility model: a pagoda-shaped connector is fixedly provided at the end of the negative pressure channel away from the main channel, and the pagoda-shaped connector is interference-fitted with the end of the extension tube.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model has an auxiliary channel on the valve body, which facilitates the insertion of interventional medical devices alone. At the same time, interventional medical devices can also be inserted through the main channel, that is, two medical devices can be inserted at the same time. It can also be connected to a negative pressure suction device through the negative pressure channel for negative pressure suction treatment. There is no need to remove and replace one device after the other device has been inserted and completed, which reduces the complexity of operation and improves the efficiency of operation.

[0019] 2. The auxiliary channel and the main channel of this utility model are provided with an arc guide plate at the intersection to facilitate the guidance of instruments entering from the auxiliary channel to turn into the main channel and converge with the instruments in the main channel. At the same time, an elastic adjustment mechanism is also provided at the intersection to work with the arc guide plate. The elastic adjustment mechanism relies on the deformation of the elastic rubber membrane to adjust the size of the corner and prevent the instruments from getting stuck at the corner.

[0020] 3. The negative pressure channel of this utility model adopts a pagoda-shaped connector to connect the extension tube used by the negative pressure suction device, which facilitates the use of larger diameter suction and at the same time ensures a sealing and anti-detachment effect. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the valve body in this utility model;

[0024] Figure 3 This is a schematic diagram of the sealing valve plate in this utility model;

[0025] Figure 4 This is a schematic diagram showing the relative positional distribution of the first and second incisions in this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the valve body in this utility model when a thrombectomy catheter and an angiography catheter are simultaneously inserted.

[0027] In the diagram: 1. Outer sheath; 2. Valve body; 211. Main channel; 221. Auxiliary channel; 231. Negative pressure channel; 3. Valve cover; 4. Extension tube; 5. Control valve; 6. Connector; 7. Sealing valve plate; 711. First incision; 712. Second incision; 8. Thrombus retrieval catheter; 9. Angiography catheter; 10. Arc guide plate; 11. Installation port; 12. Elastic rubber diaphragm; 13. Bolt puller. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1-Figure 5As shown, a three-channel negative pressure catheter includes an outer sheath 1, a valve body 2, and a negative pressure suction device. The outer sheath 1 and one port of the valve body 2 are fixedly connected together, either by adhesive bonding or injection molding. The outer sheath 1 is a composite tube with an inner layer of self-lubricating polymer material, such as PTFE (polytetrafluoroethylene) or FEP (fluorinated ethylene propylene), which reduces friction and provides good delivery when used with other instruments. The middle layer of the outer sheath 1 is a metal layer, which can be a braided metal structure to enhance the support of the tube body. Under high negative pressure, the lumen will not deform, providing good anti-collapse performance. The outer layer of the outer sheath 1 is a commonly used polymer material, such as PEBAX (polyether block polyamide). The valve body 2 is made of medical engineering material, such as ABS (acrylonitrile butadiene styrene), PC (polycarbonate), or a mixture of both, or high-hardness self-lubricating POM (polyoxymethylene), etc.

[0030] A negative pressure aspiration device is installed on the valve body 2 to apply negative pressure to the outer sheath 1, facilitating thrombus aspiration treatment. The valve body 2 is a three-channel negative pressure valve, including a main channel 211, an auxiliary channel 221, and a negative pressure channel 231 for connecting the negative pressure aspiration device. The main channel 211 is located along the central axis of the valve body 2, with one end connected to the outer sheath 1. The auxiliary channel 221 and the negative pressure channel 231 are respectively located on both sides of the main channel 211 and are inclined. The auxiliary channel 221 forms a certain angle with the main channel 211, with an angle of 25° to 35°. The inner diameter of the auxiliary channel 221 is slightly smaller than that of the main channel 211, with 8mm being the most suitable inner diameter. The aim is to maintain the overall structural harmony of the three-channel negative pressure valve, allowing doctors to easily grasp the valve's center of gravity during use, while also accommodating most interventional devices on the market. The angle between the negative pressure channel 231 and the main channel 211 is 25° to 90°, and a 6mm inner diameter for the negative pressure channel 231 is optimal, allowing even large, fibrous thrombi to pass smoothly during negative pressure aspiration. The auxiliary channel 221 and the main channel 211 facilitate the simultaneous passage of two interventional surgical instruments, such as... Figure 5 As shown, the angiography catheter 9 is inserted into the auxiliary channel 221; the thrombectomy catheter 8 is inserted into the main channel 211. After the angiography catheter 9 and the thrombectomy catheter 8 are inserted into the valve body 2, they run parallel in the main channel 211 and finally exit from the distal end of the outer sheath 1. At this time, the thrombectomy catheter 8 in the main channel 211 performs the thrombectomy operation, and the angiography catheter 9 in the auxiliary channel 221 is injected with contrast agent to facilitate continuous and coherent image display, thereby facilitating rapid determination of the vascular path, accurate location of the thrombus, and real-time monitoring of the thrombus clearance rate. Then, the negative pressure is generated by the negative pressure suction device connected to the negative pressure channel 231 to aspirate the thrombus away.

[0031] It should be noted that, in order to allow the instruments entering from the auxiliary channel 221 to smoothly turn at the inflection point and merge with the instruments in the main channel 211, a guide structure is provided at the intersection of the auxiliary channel 221 and the main channel 211 to guide the instruments entering from the auxiliary channel 221 to turn into the main channel 211.

[0032] In some specific implementation plans, combined with Figure 2 and Figure 5 As shown, the guiding mechanism includes an arc-shaped guide plate 10 and an elastic adjustment mechanism. The arc-shaped guide plate 10 is fixedly installed on one side of the intersection of the auxiliary channel 221 and the main channel 211, and the elastic adjustment mechanism is installed on the other side of the intersection of the auxiliary channel 221 and the main channel 211. When an interventional device, such as an angiography catheter 9, is inserted into the auxiliary channel 221, the end of the angiography catheter 9 contacts the arc-shaped guide plate 10 when it reaches the intersection of the auxiliary channel 221 and the main channel 211. Then, it slides and turns along the arc-shaped guide plate 10, smoothly turning into the main channel 211. If there are other interventional devices with larger end sizes, and it is difficult or impossible for them to pass through the intersection of the auxiliary channel 221 and the main channel 211, the elastic adjustment mechanism is stretched outward, thereby increasing the local size adjustment at the intersection of the auxiliary channel 221 and the main channel 211 to facilitate the passage of the device.

[0033] The elastic adjustment mechanism includes an installation port 11 and an elastic rubber diaphragm 12. The installation port 11 is located at the intersection of the auxiliary channel 221 and the main channel 211. The elastic rubber diaphragm 12 is fitted and sealed inside the installation port 11 and is arc-shaped. A pull bolt 13 is fixedly connected to the side of the elastic rubber diaphragm 12 facing the outside of the valve body 2. The elastic rubber diaphragm 12 and the arc guide plate 10 normally cooperate with each other to facilitate the passage of instruments of normal size. When it is difficult for instruments with larger end sizes to pass through the corner, medical staff can pull the pull bolt 13 from the outside of the valve body 2. The pull bolt 13 pulls the elastic rubber diaphragm 12 to deform towards the outside of the installation port 11. At this time, the size of the instrument after passing through the arc guide plate 10 becomes larger, which facilitates the instrument to turn and pass through, and avoids the passage of instruments that are blocked by the arc guide plate 10 alone.

[0034] In some specific implementations, sealing valves are provided at the end of the main channel 211 away from the outer sheath 1 and at the end of the auxiliary channel 221 away from the main channel 211, to keep the ends sealed during the insertion of the angiography catheter 9 and the thrombectomy catheter 8, and to prevent leakage.

[0035] The sealing valve component includes a valve cover 3 and a sealing valve plate 7. The sealing valve plate 7 is a stepped shape, as shown in the figure below. Figure 3As shown, it is convenient to assemble and fit at the port positions of the main channel 211 and the auxiliary channel 221. Both the main channel 211 and the auxiliary channel 221 are provided with connecting threads for fixing and connecting the valve cover 3. The valve cover 3 is used to fix and press the sealing valve plate 7, and the valve cover 3 is provided with a through hole to facilitate the passage of instruments and then through the sealing valve plate 7.

[0036] It should be noted that, as Figure 4 As shown, the sealing valve plate 7 has a first incision 711 on one side and a second incision 712 perpendicular to the first incision 711 on the other side. Neither incision completely penetrates the other. A through hole is provided at the intersection of the first incision 711 and the second incision 712. In its natural state, when no other instruments pass through the sealing valve plate 7, the incisions are closed. When instruments of different sizes pass through the sealing valve plate 7, the first incision 711 and the second incision 712 adhere to the catheter wall in both directions. The through hole at the center of the incision is stretched and expanded to the same size as the outer diameter of the thrombectomy catheter and fits tightly against the outer circumference of the catheter wall. When subjected to positive or negative pressure, the first incision 711 and the second incision 712 are respectively pressure-sealed and sealed to ensure airtightness.

[0037] In some specific implementation plans, such as Figure 1 As shown, the negative pressure suction device includes an extension tube 4, a control valve 5, and a connector 6 for connecting to a negative pressure source. One end of the extension tube 4 is connected to the negative pressure channel 231, and the other end is fixedly connected to the connector 6. The control valve 5 is installed on the extension tube 4.

[0038] Since adhesive bonding is not suitable for connecting the negative pressure channel 231 and the extension tube, a pagoda-shaped connector is fixed to the end of the negative pressure channel 231 furthest from the main channel 211. The pagoda-shaped connector is interference-fitted with the end of the extension tube 4, making it difficult to pull out once the extension tube 4 is completely fitted onto the pagoda-shaped connector. Simultaneously, the three-section pagoda seals the extension tube 4, ensuring excellent sealing.

[0039] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios:

[0040] When two medical devices need to be inserted into the outer sheath 1 for related operations, such as in thrombosis treatment, the thrombectomy catheter 8 is inserted into the main channel 211 and the angiography catheter 9 is inserted into the auxiliary channel 221. The sealing valve 7 ensures a sealing effect at the points through which the angiography catheter 9 and the thrombectomy catheter 8 pass, preventing leakage. When the end of the angiography catheter 9 reaches the intersection of the auxiliary channel 221 and the main channel 211, its end contacts the arc guide plate 10 and then slides and turns along the arc guide plate 10, smoothly entering the main channel 211. If it is difficult for the angiography catheter 9 to pass through the intersection of the auxiliary channel 221 and the main channel 211, medical staff can pull the pull plug 13 from the outside of the valve body 2. The pull plug 13 pulls the elastic rubber membrane 12 to deform towards the outside of the installation port 11. At this time, the local size of the angiography catheter 9 at the point of passing through the arc guide plate 10 becomes larger, which facilitates turning and avoids the passage of the device that is blocked by the arc guide plate 10.

[0041] Finally, both the angiography catheter 9 and the thrombectomy catheter 8 enter the main channel 211 in parallel and exit from the distal end of the outer sheath 1. Then, the thrombectomy catheter 8 in the main channel 211 performs the thrombectomy operation, while the angiography catheter 9 in the auxiliary channel 221 injects contrast agent to facilitate continuous and coherent image display, thereby facilitating rapid determination of the vascular path, accurate location of the thrombus, and real-time monitoring of the thrombus clearance rate. Then, the negative pressure is generated by the negative pressure suction device connected to the negative pressure channel 231 to aspirate the thrombus away.

[0042] The foregoing has described several embodiments of this utility model in detail, but these embodiments are not limited thereto and should not be considered as limiting the scope of this utility model. All equivalent changes and improvements made within the scope of the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A three-channel negative pressure conduit, comprising an outer sheath (1), a valve body (2), and a negative pressure suction device, wherein the outer sheath (1) is fixedly connected to the valve body (2); characterized in that: The valve body (2) includes a main channel (211), an auxiliary channel (221) and a negative pressure channel (231) for connecting a negative pressure suction device. One end of the main channel (211) is connected to the outer sheath tube (1), and the auxiliary channel (221) and the negative pressure channel (231) are respectively arranged on both sides of the main channel (211). A guiding mechanism is provided at the intersection of the auxiliary channel (221) and the main channel (211) to guide the instrument that passes through the auxiliary channel (221) into the main channel (211); The guiding mechanism includes an arc guide plate (10) and an elastic adjustment mechanism. The arc guide plate (10) is fixedly installed on one side of the intersection of the auxiliary channel (221) and the main channel (211), and the elastic adjustment mechanism is installed on the other side of the intersection of the auxiliary channel (221) and the main channel (211).

2. The three-channel negative pressure catheter according to claim 1, characterized in that, The elastic adjustment mechanism includes an installation port (11) and an elastic rubber diaphragm (12). The installation port (11) is located at the intersection of the auxiliary channel (221) and the main channel (211). The elastic rubber diaphragm (12) is enclosed in the installation port (11). A pull bolt (13) is fixedly connected to the side of the elastic rubber diaphragm (12) facing the outside of the valve body (2).

3. The three-channel negative pressure catheter according to claim 1, characterized in that, Sealing valves are provided at the end of the main channel (211) away from the outer sheath (1) and at the end of the auxiliary channel (221) away from the main channel (211).

4. A three-channel negative pressure catheter according to claim 3, characterized in that, The sealing valve includes a valve cover (3) and a sealing valve plate (7). The sealing valve plate (7) is a stepped body. The valve cover (3) is used to fix and press the sealing valve plate (7), and a through hole is provided on the valve cover (3).

5. A three-channel negative pressure catheter according to claim 4, characterized in that, The sealing valve plate (7) has a first cut (711) on one side and a second cut (712) perpendicular to the first cut (711) on the other side. A through hole is provided at the intersection of the first cut (711) and the second cut (712).

6. A three-channel negative pressure catheter according to claim 1, characterized in that, The negative pressure suction device includes an extension tube (4), a control valve (5), and a connector (6) for connecting to a negative pressure source. One end of the extension tube (4) is connected to the negative pressure channel (231), and the other end is fixedly connected to the connector (6). The control valve (5) is installed on the extension tube (4).

7. A three-channel negative pressure catheter according to claim 6, characterized in that, The negative pressure channel (231) is fixedly provided with a pagoda-shaped connector at one end away from the main channel (211), and the pagoda-shaped connector is interference-fitted with the end of the extension tube (4).

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