Blood vessel flow limiter for high-flow internal fistula

Abstract

The utility model relates to the field of vascular surgical instruments, in particular to a vascular flow restrictor for high-flow internal fistula, which comprises a body made of flexible materials, the length size and the width size of the body are at least two times of the thickness size of the body, and the length size and the width size of the body are at least two times of the thickness size of the body. A plurality of parallel first scale marks are arranged on the body at intervals in the width direction, the body can wrap the blood vessel in the width direction, and the two sides of the body are connected to compress the blood vessel. According to the blood vessel flow limiter, a large contact area can be formed between the body and a blood vessel, uniform acting force can be applied to the blood vessel, the effect of protecting the blood vessel can be achieved, and the problem that the blood vessel is easily cut due to the fact that the contact area between a suture and the blood vessel is too small and the pressure intensity per unit area is too large is solved; in addition, the diameter or radius of the blood vessel can be estimated or measured through the scale marks arranged on the surface of the body, and compared with visual size estimation, measurement through the scale marks is more visual, and the measurement precision is higher.

Description

Technical Field

[0001] The utility model relates to the field of vascular surgical instruments, and particularly relates to a blood vessel flow limiter for high-flow arteriovenous fistulas. Background Art

[0002] An artificial arteriovenous fistula (AVF) is one of the commonly used vascular accesses for dialysis patients. However, in some cases, the blood flow in the AVF may exceed 1500 ml / min, which is simply referred to as a high-flow arteriovenous fistula. A high-flow arteriovenous fistula may cause the risk of heart failure and limb ischemia in patients. Moreover, under the action of high blood flow, the blood vessels of the arteriovenous fistula may further develop, become thicker, and at the same time further elongate and become distorted, further increasing the blood flow in the arteriovenous fistula. To solve this problem, vascular flow-limiting surgery can be performed on the artificial arteriovenous fistula. The vascular flow-limiting surgery for high-flow arteriovenous fistulas mainly includes two methods: restricting the outflow tract (vein) and restricting the inflow tract (artery). Restricting the vein is mainly applicable to the situation where the anastomosis and the vein diameter are not very thick and the calcification of the outflow tract is not very obvious. If the patient's anastomosis is enlarged or calcified very obviously, or the vein is too thick, it will be very difficult to perform loop flow limitation. In this case, arterial flow limitation can be selected. The existing arterial flow-limiting method is to use a suture to wrap and tie a knot to restrict the arterial inner diameter and thus limit the arterial flow. The specific method is as follows: 1. Make a longitudinal incision at the proximal part of the radial artery near the anastomosis of the arteriovenous fistula, and separate the proximal part of the radial artery; 2. Use a suture to wrap around the artery once, and then tie a second surgical knot after reducing the artery to a certain value as needed; 3. Then, at about 5 mm away from the first coil, insert a second coil in the same way, and then place a third coil every 5 mm. The diameter of each coil is approximately equal, and the final blood flow reaches 800 - 1500 ml / min.

[0003] The existing arterial flow-limiting method has the following technical problems: the arterial pressure is high, the suture is thin, the pressure per unit area of the suture acting on the artery is large, the cutting force on the artery is large, the artery is easily cut by the suture, causing arterial infection, and even the artery needs to be resected. There is no scale on the suture, and the diameter of the blood vessel cannot be measured after the suture is wrapped, and only subjective estimation can be used, which affects the surgical effect. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the technical problems in the prior art that directly wrapping a suture outside the blood vessel for blood vessel flow limitation easily causes blood vessel injury and the diameter of the blood vessel cannot be measured after blood vessel flow limitation, and to provide a blood vessel flow limiter for high-flow arteriovenous fistulas.

[0005] The present utility model provides a blood vessel restrictor for a high - flow internal fistula, including a body. The body is made of a flexible material. The length dimension and the width dimension of the body are both at least twice the thickness dimension of the body. A plurality of parallel first scale lines are arranged at intervals along the width direction of the body. The body can be curled along the width direction and the two sides of the body can be joined together.

[0006] Compared with the prior art in which the blood vessel is directly restricted by sewing a thread around the blood vessel, which is likely to cause blood vessel laceration and the diameter of the blood vessel cannot be measured after blood vessel restriction, the blood vessel restrictor for a high - flow internal fistula of the present application can be a flexible structure, and its length and width dimensions are both much larger than its thickness dimension. It can be curled along the width direction of the body of the blood vessel restrictor and wrapped around the blood vessel in the circumferential direction of the blood vessel. At the same time, it can also wrap a section of blood vessel integrally in the length direction of the blood vessel, and the two sides of the body are joined and fixed on the blood vessel. For example, the joint on the body is sutured by a thread, and an inward pressure can be applied to the blood vessel to compress the blood vessel, and the diameter dimension of the blood vessel is reduced to achieve the effect of restricting blood flow. Since the length and width of the body of the blood vessel restrictor both have sufficient dimensions, a large contact area can be formed between the body and the blood vessel, and a uniform acting force can be applied to the blood vessel, thereby achieving the effect of protecting the blood vessel and avoiding the problem that the contact area between the suture and the blood vessel is too small, resulting in too large pressure per unit area and being likely to cut the blood vessel. In addition, by setting the first scale lines on the surface of the blood vessel restrictor, the radial dimension of the blood vessel can be estimated or measured by reading the scale difference between the radially opposite scale lines after the blood vessel restrictor is wrapped around the blood vessel. For example, the diameter or radius of the blood vessel is estimated or measured. Compared with the prior art in which the size can only be visually estimated, the scale line measurement in the present application is more intuitive, and the accuracy of the blood vessel size value obtained through measurement or conversion is higher.

[0007] Preferably, a reference line parallel to the plurality of first scale lines is also provided.

[0008] Preferably, the plurality of first scale lines are symmetrically arranged on both sides of the reference line.

[0009] Preferably, the plurality of first scale lines are evenly arranged on the blood vessel restrictor.

[0010] Preferably, a plurality of second scale lines perpendicular to the first scale lines are also provided.

[0011] Preferably, the plurality of second scale lines are evenly arranged on the blood vessel restrictor.

[0012] Preferably, the difference in scale values between two adjacent first scale lines is ΔD, and the actual distance along the surface of the blood vessel restrictor between two adjacent first scale lines is ΔL, then:

[0013]

[0014] Preferably, the difference in scale values between two adjacent first scale lines is ΔD, and the actual distance along the surface of the blood vessel restrictor between two adjacent first scale lines is ΔL, then:

[0015] ΔL = π×ΔD.

[0016] Preferably, the difference in scale values between two adjacent first scale lines is ΔD, and the actual distance along the surface of the blood vessel restrictor between two adjacent first scale lines is ΔL, then:

[0017] ΔL = ΔD.

[0018] Preferably, the material of the blood vessel restrictor includes polytetrafluoroethylene.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] The present utility model provides a blood vessel restrictor for a high-flow internal fistula. The blood vessel restrictor for a high-flow internal fistula in the present application can be a flexible structure, and its length and width dimensions are both much larger than its thickness dimension. It can be curled along the width direction of the body of the blood vessel restrictor and wrapped around the blood vessel in the circumferential direction of the blood vessel. At the same time, it can also integrally wrap a section of blood vessel in the length direction of the blood vessel, and the two sides of the body are joined and fixed on the blood vessel. For example, the joint on the body is sutured by a suture, and an inward pressure can be applied to the blood vessel to compress the blood vessel, and the diameter dimension of the blood vessel is reduced to achieve the effect of flow restriction. Since the length and width of the body of the blood vessel restrictor both have sufficient dimensions, a large contact area can be formed between the body and the blood vessel, and a uniform acting force can be applied to the blood vessel, thereby achieving the effect of protecting the blood vessel and avoiding the problem that the contact area between the suture and the blood vessel is too small, resulting in too large pressure per unit area and easily cutting the blood vessel; in addition, first scale lines are provided on the surface of the blood vessel restrictor, and after the blood vessel restrictor is wrapped around the blood vessel, the scale difference between the radially opposite scale lines can be read to estimate or measure the radial dimension of the blood vessel, such as estimating or measuring the diameter or radius of the blood vessel. Compared with the prior art that can only estimate the dimension visually, the scale line measurement in the present application is more intuitive, and the accuracy of the blood vessel dimension value obtained through measurement or conversion is higher. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the prior art using a suture to wrap around the blood vessel.

[0022] Figure 2 It is an unfolded schematic diagram of the blood vessel restrictor for a high-flow internal fistula of the present utility model.

[0023] Figure 3Schematic diagram of the blood vessel flow limiter for high-flow internal fistulas of the present utility model wrapped around a blood vessel.

[0024] Markings in the figure:

[0025] 1. Body, 11. First scale line, 12. Reference line, 13. Second scale line, 2. Blood vessel, 3. Suture. Specific embodiments

[0026] The present utility model will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model fall within the scope of the present utility model.

[0027] In the description of the specific embodiments of the present utility model, without special instructions, the expression terms of the orientation or positional relationship indicated by "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the utility model product / device / device is commonly used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be understood as a limitation to the present utility model.

[0028] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still play its role in the solution of the present utility model.

[0029] In addition, the expressions "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0030] In addition, in the description of the embodiments of the present utility model, "several", "multiple", and "a number of" represent at least two. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., or even more than 9.

[0031] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / restricted, when the terms "set", "installed", "connected", "coupled", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components.

[0032] Embodiment

[0033] This embodiment provides a vascular flow limiter for high-flow arteriovenous fistulas.

[0034] Figure 1 It is a schematic diagram of the prior art using sutures to wrap around a blood vessel. Figure 2 It is an unfolded schematic diagram of the vascular flow limiter for high-flow arteriovenous fistulas of the present utility model. Figure 3 It is a schematic diagram of the vascular flow limiter for high-flow arteriovenous fistulas of the present utility model wrapped around a blood vessel.

[0035] As Figures 1 to 3 As shown in the figure, the vascular flow limiter for high-flow arteriovenous fistulas described in this embodiment can be made of a flexible sheet material. The body 1 can wrap around the blood vessel 2 to compress the blood vessel 2. Multiple parallel first scale lines 11 can be provided on the body 1 for measuring the radial dimension of the blood vessel 2. Here, the radial dimension can be the diameter dimension or the radius dimension of the compressed blood vessel 2. After the blood vessel 2 is compressed by the body 1, its inner diameter dimension decreases, so that the flow rate of the blood flowing through the blood vessel 2 decreases, achieving the effect of limiting the flow of the blood vessel 2, and further avoiding the occurrence of high-flow arteriovenous fistulas.

[0036] Compared with the prior art where the blood vessel 2 is directly restricted in flow by winding the suture 3 outside the blood vessel 2, which easily causes damage to the blood vessel 2 and the diameter of the blood vessel 2 cannot be measured after flow restriction, the blood vessel restrictor for high-flow internal fistula of the present application can be a flexible structure, and its length and width dimensions are much larger than its thickness dimension. It can be wrapped outside the blood vessel 2 along the width direction of the body 1 of the blood vessel restrictor and in the circumferential direction of the blood vessel 2. At the same time, it can also wrap an entire section of the blood vessel 2 in the length direction of the blood vessel 2, and the two sides of the body 1 are joined and fixed on the blood vessel 2. For example, the joint on the body 1 is sutured by the suture 3, and an inward pressure can be applied to the blood vessel 2 to compress the blood vessel 2, and the flow is restricted by reducing the diameter dimension of the blood vessel 2. Since the length and width of the body 1 of the blood vessel restrictor have sufficient dimensions, a large contact area can be formed between the body 1 and the blood vessel 2, and a uniform acting force can be applied to the blood vessel 2, thereby achieving the effect of protecting the blood vessel 2 and avoiding the problem that the contact area between the suture 3 and the blood vessel 2 is too small, resulting in too large pressure per unit area and easily damaging the blood vessel 2. In addition, a first scale line 11 is provided on the surface of the blood vessel restrictor, and the radial dimension of the blood vessel 2 can be estimated or measured by reading the scale difference between the radially opposite scale lines after the blood vessel restrictor is wrapped on the blood vessel 2. For example, the diameter or radius of the blood vessel 2 can be estimated or measured. Compared with the prior art where the size can only be visually estimated, the scale line measurement in the present application is more intuitive, and the accuracy of the size value of the blood vessel 2 obtained through measurement or conversion is higher.

[0037] In this embodiment, the blood vessel restrictor for high-flow internal fistula may further be provided with a reference line 12 parallel to a plurality of first scale lines 11. Specifically, the reference line 12 can also be regarded as a zero scale line. When the body 1 is wrapped on the blood vessel 2, the reference line 12 can be arranged parallel to the axis of the blood vessel 2. When measuring the radial dimension of the blood vessel 2, the reference line 12 can be used as a measurement reference, and the radial dimension of the blood vessel 2 can be measured by reading the scale value corresponding to the scale line radially opposite to the reference line 12. A plurality of first scale lines 11 can be located on one side of the reference line 12, that is to say, the first scale lines 11 are arranged on one side of the reference line 12, and no scale line is arranged on the other side of the reference line 12.

[0038] In this embodiment, multiple first scale lines 11 can be symmetrically arranged on both sides of the reference line 12. Specifically, first scale lines 11 can be arranged on both sides of the reference line 12. When the body 1 is wrapped around the blood vessel 2, the reference line 12 can be first placed on one side in the radial direction of the blood vessel 2. Starting from the reference line 12, both sides of the reference line 12 can be wrapped towards the opposite side in the radial direction of the blood vessel 2 at the same time. The body 1 can be docked at the opposite side in the radial direction of the blood vessel 2 relative to the reference line 12. That is to say, the docking position can be radially opposite to the reference line 12 on the blood vessel 2, or the scale lines with the same scale values on both sides of the reference line 12 can be docked. Furthermore, suturing can be performed at this docking position, thereby fixing and wrapping the body 1 around the blood vessel 2. However, the present utility model is not limited thereto. After wrapping, the docking position of the body 1 may not be radially opposite to the position of the reference line 12. In this case, the diameter size of the blood vessel 2 can also be measured by reading the difference between the radially opposite scale lines. The present invention does not make specific limitations on this.

[0039] Optionally, multiple first scale lines 11 can be evenly arranged on the body 1. Specifically, multiple first scale lines 11 can be evenly distributed on the body 1. That is to say, the distance between any two adjacent first scale lines 11 among the multiple first scale lines 11 is the same. Thus, it is convenient to read the corresponding scale value for measurement in the measurement of the diameter size of the blood vessel 2. However, the present utility model is not limited thereto. The distance between any two adjacent first scale lines 11 may also be different. That is to say, the multiple first scale lines 11 may also be non-uniformly distributed on the body 1. For example, more scale lines can be added between two certain first scale lines 11 to mark more refined size values, which can further improve the measurement accuracy. However, the present utility model does not make specific limitations on the specific distance between adjacent first scale lines 11 and whether the distribution of the first scale lines 11 is uniform.

[0040] In this embodiment, the blood vessel restrictor for high-flow internal fistula may further be provided with multiple second scale lines 13 perpendicular to the first scale lines 11. The second scale lines 13 can be used to measure the axial length of the blood vessel 2 wrapped by the body 1. By setting the second scale lines 13 on the body 1, the axial length of the body 1 on the blood vessel 2 can be marked, and it can also help the surgical operator determine the required length of the body 1 before the operation. Thus, the corresponding length dimension of the body 1 can be intercepted according to the size marked by the second scale lines 13 to meet the requirements of the operation. For example, the surgeon can cut the body 1 with the corresponding length according to the size marked by the second scale lines 13 and then perform the next surgical operation.

[0041] Optionally, multiple second scale lines 13 may be evenly arranged on the body 1. Specifically, multiple second scale lines 13 may be evenly distributed on the body 1, that is, the distance between any two adjacent second scale lines 13 among the multiple second scale lines 13 is the same. Thus, it is convenient to read the corresponding scale value for measurement when measuring the length dimension of the body 1. However, the present invention is not limited thereto. The distance between any two adjacent second scale lines 13 may also be different, that is, the multiple second scale lines 13 may be non-uniformly distributed on the body 1. For example, more scale lines may be added between two second scale lines 13 to mark more refined dimension values, which can further improve the measurement accuracy. However, the present invention does not specifically limit the specific distance between adjacent second scale lines 13 and whether the distribution of the second scale lines 13 is uniform.

[0042] In this embodiment, the difference between the scale values of two adjacent first scale lines 11 is ΔD, and the actual distance along the surface of the body 1 between two adjacent first scale lines 11 is ΔL. Then:

[0043]

[0044] That is to say, the difference between the scale values indicated by two adjacent first scale lines 11 is not necessarily equal to the actual distance between the two adjacent first scale lines 11. When the body 1 is wrapped around the blood vessel 2, the actual distance between two adjacent first scale lines 11 is the arc length of the outer circumference of the blood vessel 2 covered by the part of the body 1 between the two adjacent first scale lines 11. If the two adjacent first scale lines 11 are exactly at the radially opposite positions on the blood vessel 2, then the arc length of the outer circumference of the blood vessel 2 covered by the part of the body 1 between the two adjacent first scale lines 11 may exactly be the semi-circular circumference of the outer circumference of the blood vessel 2. The difference between the scale values indicated by the two adjacent first scale lines 11 may be set as the diameter dimension of the circle corresponding to the semi-circular circumference of the outer circumference of the above blood vessel 2. Therefore, the diameter dimension of the blood vessel 2 can be directly measured by reading the difference between the scale values indicated by two radially opposite first scale lines 11 on the blood vessel 2.

[0045] Optionally, the difference between the scale values of two adjacent first scale lines 11 is ΔD, and the actual distance along the surface of the body 1 between two adjacent first scale lines 11 is ΔL. Then:

[0046] ΔL = π × ΔD.

[0047] That is to say, the difference between the scale values indicated by two adjacent first scale lines 11 is not necessarily equal to the actual distance between the two adjacent first scale lines 11. When the body 1 is wrapped around the blood vessel 2, the actual distance between the two adjacent first scale lines 11 is the arc length of the arc of the outer periphery of the blood vessel 2 covered by the part of the body 1 between the two adjacent first scale lines 11. If the two adjacent first scale lines 11 are exactly at the radially opposite positions on the blood vessel 2, then the arc length of the arc of the outer periphery of the blood vessel 2 covered by the part between the two adjacent first scale lines 11 can be exactly the semi - circular circumference of the outer periphery of the blood vessel 2. The difference between the scale values indicated by the two adjacent first scale lines 11 can be set as the radius dimension of the circle corresponding to the semi - circular circumference of the outer periphery of the above - mentioned blood vessel 2. Therefore, the radius dimension of the blood vessel 2 can be directly measured by reading the difference between the scale values indicated by two radially opposite first scale lines 11 on the blood vessel 2, and then multiplying the measured radius dimension by 2 can obtain the diameter dimension of the blood vessel 2.

[0048] Optionally, the difference between the scale values of two adjacent first scale lines 11 is ΔD, and the actual distance along the surface of the body 1 between the two adjacent first scale lines 11 is ΔL, then:

[0049] ΔL = ΔD.

[0050] The difference between the scale values indicated by two adjacent first scale lines 11 can also be equal to the actual distance between the two adjacent first scale lines 11. When the body 1 is wrapped around the blood vessel 2, the difference between the scale values indicated by the two adjacent first scale lines 11 is also the arc length of the arc of the outer periphery of the blood vessel 2 covered by the part of the body 1 between the two adjacent first scale lines 11. In this case, when measuring the diameter dimension of the blood vessel 2, it is necessary to first obtain the semi - circular circumference of the outer periphery of the blood vessel 2 by reading the difference between the scale values indicated by two radially opposite first scale lines 11 on the blood vessel 2, and then use the conversion formula between the circumference and the diameter of the circle for conversion, and further obtain the diameter dimension of the blood vessel 2 through calculation.

[0051] It should be noted that the relationship between the difference between the scale values indicated by two adjacent first scale lines 11 and the actual distance between the two adjacent first scale lines 11 can be selected according to actual needs, as long as the read scale value can be converted into the radial dimension of the blood vessel 2 through the corresponding calculation formula. The present utility model does not make specific limitations on this.

[0052] In this embodiment, the blood vessel restrictor for high-flow internal fistulas can be made of polytetrafluoroethylene material. The main body 1 can be made of a flexible material. Specifically, the flexible material can be polytetrafluoroethylene (PTFE), which is a commonly used material for artificial blood vessels and has advantages such as good biocompatibility, easy suture, easy availability, low price, and easy disinfection. In addition, the main body 1 can also be other types of flexible materials, such as hydrogels, silk proteins, and other materials that have both flexibility and human compatibility. The present utility model does not make specific limitations in this regard.

[0053] The following is a detailed description of the usage method of the blood vessel restrictor for high-flow internal fistulas described in this embodiment:

[0054] Before installing the main body 1, a longitudinal incision can be made at the proximal part of the radial artery near the arteriovenous fistula anastomosis to separate the proximal part of the radial artery. Before the operation, the length dimension of the main body 1 can be trimmed to a preset dimension according to needs to determine the length of the blood vessel 2 to be wrapped. For example, it can be 5 cm. During the operation, if it is necessary to compress the blood vessel 2 to a preset radial dimension, for example, it is necessary to compress the blood vessel 2 to a diameter of 2 mm, then during the operation, the reference line 12 of the main body 1 needs to be parallel to the axis of the blood vessel 2. After wrapping the main body 1 around the blood vessel 2, the first scale lines 11 marked on both sides of the reference line 12 with a length of 2 mm are aligned, and then sutured along the docking part of the two 2-mm first scale lines 11, so that a blood vessel 2 with a diameter of 2 mm can be obtained. If it is necessary to obtain a blood vessel 2 with a diameter of 3 mm, then the first scale lines 11 marked on both sides of the reference line 12 with a length of 3 mm need to be docked, and so on. After the suture is completed, the excess part of the main body 1 that is not wrapped on the blood vessel 2 can be cut off, and the installation operation of the blood vessel restrictor can be completed.

[0055] When using the blood vessel restrictor for high-flow internal fistulas of the present utility model to restrict the blood flow of the blood vessel 2, the contact area between the blood vessel 2 and the main body 1 is large enough, which solves the problems caused by the blood vessel restriction surgery using the suture 3, such as excessive pressure on the blood vessel 2 at the action point of the suture 3, resulting in blood vessel cutting injuries and blood vessel infections, greatly improving the safety of the surgery. The precise length markings on the main body 1 can help doctors more conveniently obtain the desired diameter of the blood vessel 2, which is convenient to use and has high practical value.

[0056] The blood vessel restrictor for high-flow internal fistulas of the present utility model can be used not only on arterial blood vessels but also on venous blood vessels according to needs. The present utility model does not make specific limitations in this regard.

[0057] In summary, the blood vessel flow limiter for high-flow internal fistulas according to the present application can be a flexible structure, and its length and width dimensions are both much larger than its thickness dimension. It can be curled along the width direction of the body of the blood vessel flow limiter and wrapped around the blood vessel in the circumferential direction of the blood vessel. At the same time, it can also wrap an entire section of the blood vessel in the length direction of the blood vessel, and the two sides of the body are joined and fixed on the blood vessel. For example, the joints on the body are sutured with sutures, and an inward pressure can be applied to the blood vessel to compress the blood vessel, and the flow-limiting effect can be achieved by reducing the diameter dimension of the blood vessel. Since the length and width of the body of the blood vessel flow limiter have sufficient dimensions, a large contact area can be formed between the body and the blood vessel, and a uniform force can be applied to the blood vessel, thereby achieving the effect of protecting the blood vessel and avoiding the problem that the contact area between the suture and the blood vessel is too small, resulting in too large pressure per unit area and easily cutting the blood vessel; in addition, a first scale line is provided on the surface of the blood vessel flow limiter, and the radial dimension of the blood vessel can be estimated or measured by reading the scale difference between the radially opposite scale lines after the blood vessel flow limiter is wrapped around the blood vessel. For example, the diameter or radius of the blood vessel can be estimated or measured. Compared with the prior art that can only estimate the size visually, the scale line measurement adopted in the present application is more intuitive, and the accuracy of the blood vessel size value obtained through measurement or conversion is higher.

[0058] The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A blood vessel flow limiter for a high-flow internal fistula, characterized in that, Comprising a main body (1), the main body (1) is made of a flexible material, the length dimension and the width dimension of the main body (1) are both at least twice the thickness dimension of the main body (1), a plurality of parallel first scale lines (11) are arranged at intervals in the width direction of the main body (1), and the main body (1) can be curled in the width direction and the two sides of the main body (1) can be joined together.

2. The vascular flow limiter for high-flow internal fistulas according to claim 1, wherein A reference line (12) parallel to a plurality of the first scale lines (11) is further provided.

3. The vascular flow limiter for high-flow internal fistulas according to claim 2, characterized in that, A plurality of the first scale lines (11) are symmetrically arranged on both sides of the reference line (12).

4. The vascular flow limiter for high-flow internal fistulas according to claim 1, characterized in that, A plurality of the first scale lines (11) are uniformly arranged on the main body (1).

5. The vascular flow limiter for high-flow internal fistulas according to claim 1, characterized in that, A plurality of second scale lines (13) perpendicular to the first scale lines (11) are further provided.

6. The vascular flow limiter for high-flow internal fistulas according to claim 5, characterized in that A plurality of the second scale lines (13) are uniformly arranged on the main body (1).

7. The vascular flow limiter for high-flow internal fistulas according to claim 1, wherein The difference in scale values between two adjacent first scale lines (11) is ΔD, and the actual distance along the surface of the main body (1) between two adjacent first scale lines (11) is ΔL, then:

8. The vascular flow limiter for high-flow internal fistulas according to claim 1, characterized in that, The difference in scale values between two adjacent first scale lines (11) is ΔD, and the actual distance along the surface of the main body (1) between two adjacent first scale lines (11) is ΔL, then: ΔL = π × ΔD.

9. The vascular flow limiter for high-flow internal fistulas according to claim 1, characterized in that, The difference in scale values between two adjacent first scale lines (11) is ΔD, and the actual distance along the surface of the main body (1) between two adjacent first scale lines (11) is ΔL, then: ΔL = ΔD.

10. The vascular flow limiter for high-flow internal fistulas according to any one of claims 1 to 9, characterized in that, The material of the main body (1) includes polytetrafluoroethylene.

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