Catheter

Abstract

The utility model relates to the technical field of medical instruments, in particular to a catheter. The catheter comprises a catheter body, and a plurality of side holes and valves are arranged on the periphery of the far end of the catheter body. At least two valves are respectively arranged at each side hole of the catheter body; the pressure in the catheter body is larger than the pressure outside the catheter body, and the adjacent valves can abut against each other to seal the corresponding side holes. The pressure in the catheter body is smaller than the pressure outside the catheter body, and channels can be formed between the valves to open the side holes. According to the technical scheme, the problems that in the prior art, forward blood flow at the near end of the aorta is blocked due to the fact that the size of a duct tube is large, tissue ischemia of the blocked portion is caused, and operation risks are increased are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially relates to a catheter. BACKGROUND

[0002] In the operation of vertebral basilar artery stenosis or slow close opening, when the catheter head end is placed in the vertebral artery V1 section distal end, if using large size catheter, it can block the proximal end of vertebral artery forward blood flow, and further cause the tissue ischemia of blocked position, increase the operation risk. To solve this problem, there are two kinds of schemes, one is to adopt the small pipe diameter catheter with lumen stenosis, however, such catheter can limit the pushing of other treatment instruments on one hand, on the other hand, if the blood vessel of patient is serious tortuous, the catheter distal end is easily embedded in the blood vessel opening, and the blood flow is blocked. Two is to adopt the catheter with side hole in the distal end, although such catheter with side hole can reduce the block of blood flow by catheter to a certain extent, but can cause the overflow of contrast agent from the side hole and show unclear, increase the repeated imaging requirement, increase the amount of contrast agent, and bring the side effect of contrast agent. This can cause many adverse effects to the patients with renal insufficiency and the elderly, and increase the X-ray radiation of patients and medical staff. Therefore, a safe catheter is needed to solve the above technical problems. SUMMARY

[0003] The utility model discloses a kind of catheters, not only can reduce the escape of contrast agent, also can make blood pass through catheter side hole, avoid the situation that blood flow is blocked.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] Provide a kind of catheter, comprising: catheter body;

[0006] The distal end of the catheter body is provided with a plurality of side holes and valves;

[0007] The catheter body is respectively provided with at least two valves at each side hole;Wherein,

[0008] The pressure inside the catheter body is greater than the pressure outside the catheter body, and the adjacent valves can abut each other to seal the corresponding side hole;

[0009] The pressure inside the catheter body is less than the pressure outside the catheter body, and the valves can form a channel to open the side hole.

[0010] Optionally, the total area of all valves at the same side hole is greater than the area of the side hole.

[0011] Optionally, the valve is fixed on the hole wall of the side hole or the inner cavity surface of the catheter body, and the valve extends towards the inner cavity center of the catheter body.

[0012] Optionally, the catheter body is bonded or welded with the valve.

[0013] Optionally, the catheter body is provided with a plurality of the side holes at intervals along the axial direction, and any two of the side holes of the catheter body are not on the same radial section.

[0014] Optionally, the axial distance between two adjacent side holes is 5-15mm.

[0015] Optionally, the distance between the side hole and the distal end of the catheter body is 5-100mm.

[0016] Optionally, the side hole is circular, and the diameter of the side hole is 0.8-3mm.

[0017] Optionally, the side hole is circular, elliptical or rectangular.

[0018] Optionally, the catheter body is symmetrically provided with two valves at each side hole.

[0019] Optionally, the valve comprises a valve end, and the valve ends of the two valves in the same side hole are oppositely arranged; wherein,

[0020] In the natural state, the two valve ends contact and form two end points away from the side line of the inner cavity center of the catheter body, and the valve seals the side hole;

[0021] When the pressure inside the catheter body is greater than the pressure outside the catheter body, the valve ends close to the side of the inner cavity center of the catheter body can be relatively moved after abutting with the connecting line of the two end points as the rotation shaft, and the valve ends away from the side of the inner cavity center of the catheter body can be away from each other.

[0022] The beneficial effects of the utility model are as follows:

[0023] The catheter provided by the utility model, when the catheter is placed in the distal end of the vertebral basilar artery V1 segment, the pressure inside the catheter body is less than the pressure outside the catheter body when the heart contracts, blood flows into the catheter body through the side hole, the forward blood flow to the distal end of the vertebral artery blocked by the catheter can be continuously provided, so that the vertebral artery forward blood flow is prevented from being blocked due to the large size of the catheter, and brain tissue ischemic injury is further caused; when the contrast agent is injected from the proximal end of the catheter body, the pressure inside the catheter body is greater than the pressure outside the catheter body as the contrast agent enters the catheter body, the side hole is sealed by the corresponding valve, and the situation that the contrast agent overflows out of the catheter body through the side hole is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a partial sectional view of the catheter body provided by the utility model.

[0025] Figure 2 is a projection view of the valve provided by the utility model;

[0026] Figure 3 is a sectional view of the catheter body provided by the utility model;

[0027] Figure 4 is a structural schematic view of the catheter provided by the utility model;

[0028] Figure 5 is a sectional view of the catheter provided by the utility model Figure 4 at B in the above;

[0029] Figure 6 is a catheter intervention diagram provided by the utility model.

[0030] In the drawings:

[0031] 10, vertebral artery V1 section

[0032] 100, catheter body; 101, side hole; 110, inner layer; 120, intermediate layer; 121, around spring; 122, braided mesh; 130, outer layer;

[0033] 200, valve;

[0034] 300, stress buffer tube;

[0035] 400 catheter seat

[0036] 500 developing ring DETAILED DESCRIPTION

[0037] The utility model will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0038] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature is on, above and on of second feature includes that first feature is directly above and obliquely above of second feature, or only indicates that horizontal height of first feature is higher than second feature. First feature is under, below and under of second feature includes that first feature is directly below and obliquely below of second feature, or only indicates that horizontal height of first feature is less than second feature.

[0040] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and "radial" refer to the orientation or position shown in the drawings, which are for convenience and simplification of description and operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] Referring to Figures 1 to 6 As shown in the drawings, the embodiment provides a catheter, which comprises a catheter body 100 and a valve 200.

[0042] Specifically, a plurality of side holes 101 are arranged on the distal end peripheral part of the catheter body 100, and at least two valves 200 are arranged at each side hole 101 of the catheter body 100; wherein the internal pressure of the catheter body 100 is greater than the external pressure of the catheter body 100, and the adjacent valves 200 can abut each other to seal the corresponding side hole 101; the internal pressure of the catheter body 100 is less than the external pressure of the catheter body 100, and a channel can be formed between the valves 200 to open the side hole 101. In the embodiment, the distal end of the catheter body 100 refers to the end of the catheter body 100 that extends into the body during the operation, and the proximal end of the catheter body 100 refers to the opposite end of the distal end of the catheter body 100.

[0043] Exemplarily, when the distal end of the catheter body 100 is placed at the distal end of the basilar artery V1 segment, the internal pressure of the catheter body 100 is less than the external pressure of the catheter body 100 when the heart contracts, the valves 200 are impacted by the blood, and a channel is formed between the valves 200, i.e. the side hole 101 is in an open state, the blood flows into the catheter body 100 through the side hole 101, and the forward blood flow can be continuously provided to the distal end of the vertebral artery that is blocked, avoiding the blockage of the forward blood flow of the vertebral artery due to the large size of the catheter, and further avoiding the ischemic injury of the brain tissue.

[0044] Exemplarily, when injecting contrast agent from the proximal end of the catheter body 100, as the contrast agent enters the catheter body 100, the pressure inside the catheter body 100 is greater than the pressure outside the catheter body 100, and the side hole 101 is sealed by the corresponding valve 200 under the extrusion of the contrast agent, that is, the side hole 101 is in a closed state, effectively reducing the occurrence of the contrast agent overflowing out of the catheter body 100 through the side hole 101.

[0045] Exemplarily, due to the arrangement of the side hole 101, the catheter body 100 can have a large enough diameter, suitable for pushing various treatment instruments, and reducing the risk of the distal end of the catheter body 100 being embedded in the blood vessel opening.

[0046] Exemplarily, the total area of all valves 200 at the same side hole 101 is greater than the area of the side hole 101, and when the pressure inside the catheter body 100 is greater than the pressure outside the catheter body 100, the sealing of the side hole 101 by the valve 200 is stable and reliable.

[0047] Exemplarily, the catheter body 100 and the valve 200 can be bonded or welded, which is convenient for connection. Of course, the catheter body 100 and the valve 200 can also be connected by other means, which is not limited in the present application.

[0048] Exemplarily, the valve 200 can be fixed on the hole wall of the side hole 101 and arranged to extend towards the center of the inner cavity of the catheter body 100, which is convenient for connection and can make the outer surface of the catheter body 100 smoother to facilitate the catheter body 100 to penetrate into the body.

[0049] Exemplarily, the valve 200 can be fixed on the inner cavity surface of the catheter body 100 and arranged to extend towards the center of the inner cavity of the catheter body 100, which is convenient for connection and can make the outer surface of the catheter body 100 smoother to facilitate the catheter body 100 to penetrate into the body.

[0050] In the present embodiment, the catheter body 100 is provided with a plurality of side holes 101 in the axial direction. In the present embodiment, the arrangement of the plurality of side holes 101 can ensure the amount of blood flowing into the catheter body 100 through the side hole 101 when the distal end of the catheter body 100 is located at the distal end of the vertebral basilar artery V1 segment, thereby improving safety and further reducing the limitation on the size of the catheter.

[0051] In a feasible implementation, any two side holes 101 of the catheter body 100 are not on the same radial section, which can make the catheter body 100 have good support force, be suitable for guiding and setting, and balance the blood impact force received by the valve 200 at each side hole 101, thereby avoiding the occurrence of local excessive pressure in the blood vessel and improving safety.

[0052] Exemplarily, the axial distance between two adjacent side holes 101 along the catheter body 100 is 5mm-15mm. When the distal end of the catheter body 100 is located at the distal end of the vertebral artery V1 segment 10, the blood flow into the catheter body 100 through the side hole 101 can be ensured, and the vertebral artery blood flow can be effectively prevented from being blocked. Exemplarily, three side holes 101 are designed on the catheter body 100, and each side hole 101 is provided with a valve 200, wherein the distance between the side hole 101 and the distal end of the catheter body 100 is 5mm, 15mm and 20mm respectively.

[0053] Exemplarily, the distance between the side hole 101 and the distal end of the catheter body 100 is 5mm-100mm, for example, the distance between the side hole 101 closest to the distal end of the catheter body 100 and the distal end of the catheter body 100 is 8mm, 10mm or 12mm, which can effectively prevent the vertebral artery blood flow from being blocked.

[0054] Exemplarily, the side hole 101 can be circular, oval or rectangular. Of course, the side hole 101 can also be other shapes, which are not limited in the present application.

[0055] Exemplarily, taking the circular side hole 101 as an example, the hole diameter of the side hole 101 is 0.8mm-3mm, so as to ensure the blood flow through the side hole 101, and the valve 200 can be stably and reliably sealed under the extrusion of the contrast agent. Preferably, the hole diameter of the side hole 101 is 1mm-2mm, for example, 1.5mm.

[0056] In a feasible implementation, the side holes 101 can be arranged in columns, specifically, the side holes 101 are provided with at least two columns, and any two columns of side holes 101 are arranged in axial staggered manner along the catheter body 100.

[0057] In a feasible implementation, the catheter body 100 is symmetrically provided with two valves 200 at each side hole 101, which can better ensure the blood flow through the side hole 101, and can better ensure that the valve 200 is stably and reliably sealed under the extrusion of the contrast agent.

[0058] Specifically, the valve 200 includes a valve end, and the valve ends of the two valves 200 in the same side hole 101 are oppositely arranged. Wherein, the valve end is located at the end of the valve 200 away from the side hole 101.

[0059] In a natural state, the two valve ends are in contact with the side edge line away from the center of the lumen of the catheter body 100 and form two end points, and the valve 200 closes the side hole 101. When the contrast agent is injected into the catheter body 100, the valve 200 in the natural state effectively prevents the contrast agent from flowing out of the catheter body 100, and ensures good imaging effect.

[0060] In addition, when the pressure inside the catheter body 100 is greater than the pressure outside the catheter body 100, the side edges of the valve ends close to the center of the inner cavity of the catheter body 100 can abut against each other after relative movement about the line connecting the two end points, and the side edges of the valve ends away from the center of the inner cavity of the catheter body 100 can move away from each other. When the contrast agent is injected into the catheter body 100, the valve 200 is extruded by the contrast agent, and even if movement occurs, the seal of the opposite hole 101 can be maintained at all times to reduce the outflow of the contrast agent outside the catheter body 100 and ensure good contrast effect.

[0061] In this embodiment, as shown in Figure 2 , in the natural state, the side edges of the two valve ends away from the center of the inner cavity of the catheter body 100 are in line contact and form two points of projection a that coincide with Figure 2 . And when the pressure inside the catheter body 100 is greater than the pressure outside the catheter body 100, the side edges of the valve ends close to the center of the inner cavity of the catheter body 100 abut against each other after relative movement about the line connecting the two end points, that is, the two points b of projection in Figure 2 coincide. In addition, Figure 2 , the line connecting the projection points a and the two points b in forms a V shape.

[0062] Exemplarily, the valve 200 is a petal-shaped with a slight convexity on the upper and lower surfaces, and the valve ends are formed by oblique truncation of the valve 200.

[0063] In this embodiment, the proximal end of the catheter body 100 is connected with a stress buffer tube 300, and the stress buffer tube 300 is connected with a catheter seat 400.

[0064] Exemplarily, the stress buffer tube 300 can be a hard plastic tube, which is a stress release site of the catheter.

[0065] Exemplarily, the catheter seat 400 can be a luer joint, which is used to connect with external devices such as Y valves, and provides convenience for the delivery of various interventional instruments in the catheter.

[0066] In a feasible implementation, the distal end of the catheter body 100 is further provided with a developing ring 500, and the material of the developing ring 500 can be platinum-iridium alloy or gold or platinum. The platinum-iridium alloy, gold and platinum are clearly developed under X-ray, so as to position the distal end of the catheter body 100.

[0067] In the embodiment, the catheter body 100 is sequentially provided with an inner layer 110, an intermediate layer 120 and an outer layer 130 from inside to outside. The material of the inner layer 110 includes but is not limited to polytetrafluoroethylene (PTFE), the outer layer 130 can be a high polymer material with certain hardness, and the material of the outer layer 130 includes but is not limited to nylon, thermoplastic polyurethane elastomer (TPU), and the intermediate layer 120 can sequentially include a coil spring 121 and a woven mesh 122 from inside to outside, and can provide sufficient support force while ensuring the inner cavity size of the catheter body 100.

[0068] Exemplarily, the woven mesh 122 can be composed of flat steel wires, the height dimension of the cross section of the flat steel wires can be 0.02mm-0.09mm, and the width dimension can be 0.06mm-0.25mm. In actual application, different weaving densities can be set to achieve the performance of the catheter body 100, so as to ensure that the catheter body 100 has high compliance and coaxiality, and also ensure that the catheter body 100 has strong support force, enhances the anti-folding performance of the distal end of the catheter body 100, and thus improves the clinical use performance.

[0069] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1.A catheter, characterized in that: the catheter comprises a catheter body (100), and a plurality of side holes (101) and valves (200) are arranged on the periphery of the distal end of the catheter body (100); at least two valves (200) are arranged at each side hole (101) of the catheter body (100); when the pressure inside the catheter body (100) is greater than the pressure outside the catheter body (100), the adjacent valves (200) can abut each other to seal the corresponding side hole (101); when the pressure inside the catheter body (100) is less than the pressure outside the catheter body (100), the valves (200) can form a passage between them to open the side hole (101). 2.The catheter of claim 1, characterized in that: two valves (200) are symmetrically arranged at each side hole (101) of the catheter body (100); the total area of all valves (200) at the same side hole (101) is greater than the area of the side hole (101). 3.The catheter of claim 1, characterized in that: the valves (200) are fixed on the hole wall of the side hole (101) or the inner cavity surface of the catheter body (100), and the valves (200) extend towards the center of the inner cavity of the catheter body (100). 4.The catheter of claim 1, characterized in that: the catheter body (100) and the valves (200) are bonded or welded. 5.The catheter of claim 1, characterized in that: a plurality of side holes (101) are arranged at intervals along the axial direction of the catheter body (100), and any two side holes (101) of the catheter body (100) are not on the same radial section. 6.The catheter of claim 5, characterized in that: the axial distance between two adjacent side holes (101) is 5mm-15mm. 7.The catheter of claim 1, characterized in that: the distance between the side hole (101) and the distal end of the catheter body (100) is 5mm-100mm. 8.The catheter of claim 1, characterized in that: the side hole (101) is circular in shape; the diameter of the side hole (101) is 0.8mm-3mm. 9.The catheter of claim 1, characterized in that: the side hole (101) is circular, elliptical or rectangular in shape. 10.The catheter of claim 1, characterized in that: the valve (200) comprises a valve end, and the valve ends of two valves (200) in the same side hole (101) are arranged opposite to each other; wherein, in a natural state, the two valve ends are in contact with each other and form two end points away from the side line of the center of the inner cavity of the catheter body (100), and the valve (200) seals the side hole (101). The pressure inside the catheter body (100) is greater than the pressure outside the catheter body (100), the side edges of the valve end close to the center of the inner cavity of the catheter body (100) can abut after relative movement with the line connecting two end points as the rotation axis, and the side edges of the valve end away from the center of the inner cavity of the catheter body (100) can move away from each other.

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