A catheter assembly for dilating a blood vessel

Abstract

The utility model relates to a kind of catheter assembly for dilating blood vessel in the technical field of medical devices, comprising: main pipe body, its first end is set as the round head of closed structure, its tail end exposes outside human body, its lateral wall is opened and is arranged with several side holes along the length direction of main pipe body;Injection connector, its output end is connected with the tail end of main pipe body, and its input end is detachably connected with liquid injection component;Guide wire for guiding main pipe body to enter distal blood vessel, to reach ideal site and withdraw main pipe body in operation. In operation, after distal end blocks blood flow by body surface compression blood vessel, liquid can be conveniently injected into main pipe body by syringe, liquid is flushed out by side hole, liquid pressure is given to blood vessel wall, to flexibly dilate blood vessel.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically, to a catheter assembly for dilating blood vessels. Background Technology

[0002] In arteriovenous fistula surgery, it is necessary to dilate the corresponding blood vessels. Currently available methods for dilating blood vessels include (but are not limited to):

[0003] 1. A non-invasive vascular dilator made of stainless steel is used to dilate blood vessels. However, this dilator has obvious drawbacks, specifically: stainless steel is hard and rigid, causing some damage to the blood vessels due to its rigidity, and it lacks conformity to the shape of the blood vessels; it can only dilate blood vessels through the elliptical tip, and the degree of dilation is limited. It is necessary to gradually increase the size of the dilator to achieve the desired degree of dilation, which also leads to waste of equipment; the tip of the dilator is relatively large, especially if the procedure involves a side incision to enter the blood vessel lumen, the incision needs to be large, especially when dilating arteries, where the blood flow pressure is high and there is more bleeding during the dilation process.

[0004] 2. Forceps are used to dilate blood vessels, but this dilator has obvious disadvantages. Specifically, the expansion of blood vessels is achieved by the surgeon using forceps in the surgical field. The expansion range is limited, at most within 5cm around the perimeter of the surgical field. It is difficult to meet the purpose of long-range vascular dilation in surgery and promote the early maturation of arteriovenous fistulas.

[0005] 3. Balloon dilation is relatively expensive and is generally used for local dilation. Arteriovenous fistulas require dilation of the longest possible segment of the blood vessel. Moreover, compared to fluid dilation, balloon dilation is relatively more invasive.

[0006] 4. Ureteral catheters (J-shaped tubes) are used to dilate blood vessels, but this dilator has obvious disadvantages, specifically: it only has side holes at the tip, limiting the area of ​​fluid dilation and preventing 360-degree, full-length dilation; to achieve sufficient dilation, it often relies on adjusting to a larger catheter size, increasing the catheter diameter to dilate it, and since the catheter was originally designed for the ureter and is relatively rigid, forcibly inserting it into the blood vessel can cause significant damage; there is no connector for connecting a syringe at the end, requiring the use of a custom-made syringe, which often results in an incompatible size and insufficient fluid pressure.

[0007] To address the shortcomings of existing vasodilators, a vasodilator catheter (authorization number CN213220349U) is disclosed in the prior art. This catheter has a pointed tip at its front end and a base at its rear end, which communicates with the catheter. A microguidewire is mounted on the base, passing through the catheter and the pointed tip sequentially, and extending beyond the pointed tip. However, this technical solution also has significant drawbacks. During insertion into the blood vessel, the pointed tip of the catheter presents operational difficulties and increases the risk of puncturing the vessel. Utility Model Content

[0008] The purpose of this invention is to provide a catheter assembly for dilating blood vessels, thereby solving the problems existing in the prior art.

[0009] The purpose of this invention is achieved as follows: a catheter assembly for dilating blood vessels, comprising:

[0010] The main body has a closed round head at its front end and its rear end protruding outside the human body. Several side holes are arranged along the length of the main body on its side wall.

[0011] The injection connector has an output end connected to the tail end of the main body and an input end that is detachably connected to the injection component.

[0012] The guidewire is used during the procedure to guide the main tube into the distal blood vessel and withdraw it after reaching the desired location.

[0013] Furthermore, the injection component is configured as a syringe, and the outlet end of the syringe is detachably connected to the input end of the injection connector.

[0014] Furthermore, the injection component is configured as an electronic pump, the suction end of the electronic pump is connected to the liquid tank, and the discharge end of the electronic pump is detachably connected to the input end of the injection connector.

[0015] Furthermore, the input end of the injection connector is detachably encapsulated with a sealing element when it is necessary to close the main body.

[0016] Furthermore, the sealing component is fixedly connected to a deformable connecting plate, one end of which is connected to the outer wall of the injection connector.

[0017] Furthermore, it also includes a tapered variable-diameter tube body that protrudes outside the human body, with its narrowest end fixedly connected and communicating with the tail end of the main tube body, and its widest end detachably connected and communicating with the output end of the injection connector.

[0018] Furthermore, the outer wall of the main tube has several scale lines distributed along its length to indicate the length of entry into the blood vessel.

[0019] Furthermore, the main body and the round head are smoothly connected and integrally formed, and both the main body and the round head are made of deformable material.

[0020] The beneficial effects of this utility model are as follows:

[0021] The head of the main tube is designed with a closed, rounded tip, eliminating the need to pass the guidewire through the head of the main tube. The rounded tip can make smooth contact with the inner wall of the blood vessel, preventing damage to the inner wall and providing good guidance.

[0022] During the procedure, after the blood flow is blocked by compressing the blood vessel on the body surface, liquid can be easily injected into the main tube through a syringe. The liquid rushes out through the side hole, applying liquid pressure to the blood vessel wall to flexibly dilate the blood vessel. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention.

[0024] Figure 2 This is a schematic diagram of Embodiment 2 of this utility model.

[0025] Figure 3 This is a schematic diagram illustrating the principle of vasodilation.

[0026] Figure 4 This is a schematic diagram of Embodiment 3 of this utility model.

[0027] Figure 5 This is a schematic diagram of Embodiment 4 of this utility model.

[0028] Figure 6 This is a schematic diagram of Embodiment 5 of this utility model. Detailed Implementation

[0029] The following will refer to the appendix in the embodiments of this utility model. Figure 1-6 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Example 1

[0031] like Figure 1 , 3 As shown, a catheter assembly for dilating blood vessels is proposed, comprising:

[0032] The main body 1 has a closed round head 101 at its front end (the guide wire cannot penetrate the round head 101), and its tail end protrudes outside the human body. Several side holes 102 are arranged along the length of the main body 1 on its side wall. The arrangement of the side holes 102 can be customized according to specific requirements and is not limited here. The main body 1 and the round head 101 are smoothly connected and integrally formed. Both the main body 1 and the round head 101 are made of deformable material. The material of the round head 101 is the same as that of the main body 1. Both are medical deformable materials, and the texture and thickness can be customized.

[0033] Injection connector 3, its output end is connected to the tail end of main body 1, and its input end is detachably connected to the injection component;

[0034] During the procedure, the guidewire 8 is used to guide the main body 1 into the distal blood vessel and withdraw it after reaching the ideal location. It is convenient to adapt to different course directions and branches of the blood vessel 7. When in use, the guidewire 8 needs to be inserted into the main body 1. At the same time, the guidewire 8 passes through the injection connector 3, and the outermost end of the guidewire 8 is exposed outside the body so that the guidewire 8 can be removed.

[0035] In Embodiment 1, the injection component is set as syringe 4, which is a commonly used component, resulting in lower cost. The liquid outlet of syringe 4 is detachably plugged into the input end of injection connector 3.

[0036] The outer wall of the main tube 1 has several scale lines 2 distributed along its length to indicate the length of entry into the blood vessel 7, corresponding to the markings on the body surface.

[0037] During the procedure, after the blood flow is blocked by compressing the blood vessel on the body surface at the distal end, liquid can be easily injected into the main body 1 through the syringe 4. The liquid rushes out through the side hole 102, applying liquid pressure to the blood vessel wall to flexibly dilate the blood vessel 7.

[0038] Example 1 achieves the following objectives: reducing damage to the blood vessel wall, conforming to the course of the blood vessel, and simultaneously exploring the patency of the proposed anastomosing vessel, ruling out branches, thrombosis, significant stenosis, etc., and using fluid to dilate the blood vessel 7 in all directions, increasing the venous diameter to reduce blood flow resistance after arteriovenous anastomosis. If necessary, the arterial diameter can be increased to increase arterial blood flow, which together promotes the maturation of arteriovenous fistula, and is more perfectly compatible with syringe 4, making it convenient to increase fluid pressure.

[0039] Example 2

[0040] like Figure 2 , 3 As shown, in order to make the injection process precise and controllable, in Embodiment 2, the injection component is set as an electronic pump 5. The suction end of the electronic pump 5 is connected to the liquid tank 6, and the discharge end of the electronic pump 5 is detachably plugged into the input end of the injection connector 3.

[0041] The scheme of Example 2 can better control the pressure of vascular fluid expansion and control the pressure change of the injected fluid on the blood vessel wall.

[0042] Example 3

[0043] like Figure 4 As shown, Embodiment 3 can be used in conjunction with Embodiment 1 or Embodiment 2. The difference from Embodiment 1 is that the input end of the injection connector 3 is detachably encapsulated with a sealing element 10 when it is necessary to close the main tube body 1. The sealing element 10 is fixedly connected to a deformable connecting plate 9, one end of which is connected to the outer wall of the injection connector 3.

[0044] When fluid injection is required, the sealing element 10 is opened to allow the fluid injection component to inject fluid; when the sealing element 10 is used to plug the injection connector 3, it is used to close the injection port when the fluid dilates the blood vessels.

[0045] Example 4

[0046] like Figure 5 As shown, based on the scheme of Embodiment 3, the catheter assembly also includes a tapered variable diameter tube 11, which is exposed outside the human body. Its narrowest end is fixedly connected and communicates with the tail end of the main tube 1, and its widest end is detachably connected and communicates with the output end of the injection connector 3, so as to facilitate the replacement of the injection connector 3.

[0047] During the infusion process, the liquid is gathered by the reducing tube 11 and then fed into the main tube 1, which can increase the pressure of the liquid expansion.

[0048] Example 5

[0049] like Figure 6 As shown, based on the solutions of Embodiment 4 or Embodiment 3, corresponding improvements were made to the injection connector 3:

[0050] Injection connector 3 includes:

[0051] The connector body 301 (with internal channel 303) and the liquid inlet 302 (designated as the liquid inlet end, tubular structure) are different from commonly used one-way valve connectors in that the liquid inlet 302 is threadedly connected to the connector body 301.

[0052] The duckbill valve core 304 (a type of one-way valve) is shaped like a duckbill and is a commonly used one-way valve in medical devices. In this embodiment, after the threaded connection connector body 301, the liquid inlet 302 presses the overlap of the duckbill valve core 304 onto the stepped surface in the internal channel 303. After liquid is injected into the liquid inlet 302, the pressure of the liquid forces open the liquid outlet of the duckbill valve core 304. After the injection stops, the anti-backflow performance of the duckbill valve core 304 prevents the backflow of the dilating vasodilator.

[0053] This embodiment can combine a deformable connecting plate 9 and a sealing component 10, the sealing component 10 can block the liquid inlet 302.

[0054] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In this utility model, it should also be noted that the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, integral molding connection, mechanical connection, or indirect connection through intermediate connecting parts. The specific meaning of the terms in this utility model can be understood according to the specific circumstances.

[0055] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A catheter assembly for dilating blood vessels, characterized in that, include: The main body (1) has a closed round head (101) at its front end and its rear end protruding outside the human body. Several side holes (102) are arranged along the length of the main body (1) on its side wall. The injection connector (3) has its output end connected to the tail end of the main body (1) and its input end detachably connected to the injection component. The guidewire (8) is used during the procedure to guide the main body (1) into the distal blood vessel and withdraw it after reaching the ideal location.

2. The catheter assembly for dilating blood vessels according to claim 1, characterized in that, The injection component is configured as a syringe (4), and the liquid outlet of the syringe (4) is detachably inserted into the input end of the injection connector (3).

3. A catheter assembly for dilating blood vessels according to claim 1, characterized in that, The injection component is an electronic pump (5), the suction end of the electronic pump (5) is connected to the liquid tank (6), and the discharge end of the electronic pump (5) is detachably plugged into the input end of the injection connector (3).

4. A catheter assembly for dilating blood vessels according to claim 1, characterized in that, The input end of the injection connector (3) is detachably encapsulated with a sealing element (10) when it is necessary to close the main body (1).

5. A catheter assembly for dilating blood vessels according to claim 4, characterized in that, The sealing component (10) is fixedly connected to a deformable connecting plate (9), one end of which is connected to the outer wall of the injection connector (3).

6. A catheter assembly for dilating blood vessels according to claim 1, characterized in that, It also includes a tapered variable diameter tube (11) that protrudes outside the human body, with its narrowest end fixedly connected to and communicating with the tail end of the main tube (1), and its widest end detachably connected to and communicating with the output end of the injection connector (3).

7. A catheter assembly for dilating blood vessels according to claim 1, characterized in that, The outer wall of the main tube (1) has several scale lines (2) distributed along its length to indicate the length of the entry into the blood vessel (7).

8. A catheter assembly for dilating blood vessels according to any one of claims 1-7, characterized in that, The main body (1) and the round head (101) are smoothly connected and integrally formed, and both the main body (1) and the round head (101) are made of deformable material.

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