A support catheter with adjustable compliance

Abstract

The application provides a support catheter with adjustable flexibility, and belongs to the technical field of medical devices; the support catheter comprises a tube body, the tube body is provided with a protective layer arranged at the outermost side and a guide layer arranged at the innermost side, a support layer is arranged between the protective layer and the guide layer, the distal end of the tube body is provided with a flexibility adjustment section, the flexibility adjustment section is used for extending out of a sheath tube and extending to a thrombus position, a plurality of arc-shaped cavities are arranged between the protective layer and the guide layer of the flexibility adjustment section, an arc-shaped reinforcing piece is movably arranged on one side of the tube body close to the proximal end of the flexibility adjustment section, the shape of the arc-shaped reinforcing piece is matched with that of the arc-shaped cavities, and during operation, after the tube body is pushed to a position, the arc-shaped reinforcing piece is pushed into the arc-shaped cavities to increase the support of the flexibility adjustment section; and the above technical problems existing in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a support catheter with adjustable flexibility. BACKGROUND

[0002] Cerebral stroke, also known as stroke or cerebral vascular accident (CVA), is an acute cerebral vascular disease caused by the rupture of cerebral blood vessels or the blockage of blood vessels due to the inability of blood to flow into the brain, resulting in brain tissue damage. It includes ischemic and hemorrhagic stroke. The incidence of ischemic stroke is higher than that of hemorrhagic stroke, accounting for 60-70% of the total number of cerebral stroke.

[0003] A major cause of ischemic stroke is the presence of thrombus in the cerebral blood vessels, which leads to vascular embolism and reduces the flow performance of blood in the blood vessels.

[0004] Surgical treatment is usually used for vascular embolism, and the treatment effect is more significant. During the operation, the doctor first delivers a sheath tube into the blood vessel through the femoral artery of the patient to establish an instrument delivery channel. Due to the delivery function of the sheath tube, the diameter of the catheter cannot be designed too narrow, so the sheath tube cannot reach the thrombus position, but reaches a position away from the thrombus by a certain distance. At this time, the support catheter is delivered into the body through the sheath tube, and the diameter of the support catheter is smaller than that of the sheath tube, so it can be stretched out from the distal end of the sheath tube. The support catheter further advances to the thrombus position until it reaches the thrombus position, and then the thrombus-removing stent is delivered to the thrombus position through the support catheter.

[0005] During the above process, the support catheter needs to have good flexibility as a whole during the process of extending from the distal end of the sheath tube and advancing to the thrombus position, so as to facilitate the passage in the tortuous blood vessels without damaging the blood vessels. However, during the process of pushing the thrombus-removing stent to the thrombus position through the support catheter after the support catheter is in place, the support catheter needs to have corresponding support performance, so as not to be easily displaced and enable the thrombus-removing stent to be accurately pushed to the thrombus position.

[0006] However, the flexibility of the existing support catheter is determined from the moment it is processed, and it cannot meet the needs of flexibility in the early stage and the needs of support performance in the later stage at the same time.

[0007] Therefore, it is necessary to provide an improved technical solution for the above-mentioned deficiencies of the prior art. SUMMARY

[0008] The present application aims to provide a support catheter with adjustable flexibility to solve the above-mentioned technical problems existing in the prior art.

[0009] In order to achieve the above-mentioned purpose, the support catheter with adjustable flexibility of the present application provides the following technical solutions.

[0010] The support catheter with adjustable flexibility comprises a tube body, the tube body has a protective layer arranged at the outermost side and a guide layer arranged at the innermost side, a support layer is arranged between the protective layer and the guide layer, the distal end of the tube body has a flexibility adjustment section, the flexibility adjustment section is used to extend out of a sheath tube to a thrombus position, a plurality of arc-shaped cavities are arranged between the protective layer and the guide layer of the flexibility adjustment section, an arc-shaped reinforcing member is movably arranged on one side of the tube body close to the proximal end of the flexibility adjustment section, the shape of the arc-shaped reinforcing member is matched with the arc-shaped cavities, and in operation, after the tube body is pushed to the position, the arc-shaped reinforcing member is pushed into the arc-shaped cavities to increase the supportability of the flexibility adjustment section.

[0011] As a further optimized technical solution, a pushing wire is fixedly arranged at the proximal end of the arc-shaped reinforcing member, a pushing channel extending in the axial direction is arranged on the tube body, and the pushing wire is arranged in the pushing channel and slidably matched with the pushing channel.

[0012] As a further optimized technical solution, a tightening wire is arranged in the axial direction in the arc-shaped reinforcing member, and the tightening wire axially compresses the arc-shaped reinforcing member after the arc-shaped reinforcing member is pushed into the arc-shaped cavities, so as to enhance the supportability of the arc-shaped reinforcing member.

[0013] As a further optimized technical solution, the proximal end of the tightening wire is fixedly connected with the arc-shaped reinforcing member, and the distal end is provided with a tightening member for tightening the tightening wire.

[0014] As a further optimized technical solution, the tightening member comprises a first magnetic block and a second magnetic block, the first magnetic block is fixedly connected with the distal end of the tightening wire, the second magnetic block is fixedly arranged at the distal end of the arc-shaped cavity, the proximal end of the second magnetic block is provided with a groove with a cross section not smaller than that of the first magnetic block, and the depth dimension of the groove in the axial direction is greater than the height dimension of the first magnetic block in the axial direction, so that after the first magnetic block falls into the groove, the tightening wire is tightened.

[0015] As a further optimized technical solution, the second magnetic block comprises a magnetic block part and a limiting part which are fixedly arranged in sequence from the distal end to the proximal end, and the groove is arranged in the limiting part.

[0016] As a further optimized technical solution, the bottom of the groove extends to the interface position between the magnetic block part and the limiting part.

[0017] As a further optimized technical solution, the first magnetic block and the second magnetic block are both electromagnets.

[0018] As a further optimization technical solution, the arc-shaped reinforcing member is provided with a containing groove for containing the first magnetic block at the distal end, and the depth dimension of the containing groove in the axial direction is not less than the height dimension of the first magnetic block in the axial direction.

[0019] As a further optimization technical solution, the distal end of the tube body is provided with a developing ring for positioning the position of the tube body.

[0020] Beneficial effects:

[0021] (1) The support catheter of the present application breaks through the limitation of fixed flexibility of traditional support catheters, and can flexibly and accurately adjust the flexibility and supportability of the distal end of the support catheter according to different needs of the surgical process. In the early stage of the support catheter passing through the tortuous blood vessels, good flexibility can effectively avoid damage to the blood vessel wall, reduce the risk of complications such as blood vessel rupture and bleeding during the operation process; and in the later stage of pushing the thrombus stent, reliable supportability ensures that the thrombus stent can accurately reach the thrombus position, significantly improves the success rate of thrombectomy, and thus improves the overall treatment effect of the operation, providing stronger guarantee for the rehabilitation of patients.

[0022] (2) The support catheter fully considers the convenience and reliability of clinical operation in design. The reasonable arrangement of the push wire and the push channel enables the doctor to easily and smoothly push the arc-shaped reinforcing member into the target position - the arc-shaped chamber, and the operation process is simple and direct, reducing the risk of operation time extension and errors due to complex operation. At the same time, the cooperation of the taut wire and the taut component composed of magnetic blocks not only realizes effective reinforcement of the arc-shaped reinforcing member, but also this structure design has high stability and reliability, and can always maintain good working condition during the operation, providing solid technical support for the smooth operation.

[0023] (3) The design of setting the first magnetic block and the second magnetic block as electromagnets greatly expands the performance adjustment space of the support catheter. The doctor can accurately control the size and direction of the current according to the specific situation in the actual operation, flexibly adjust the magnetic strength and polarity of the magnetic block, and thus finely adjust the tension degree of the taut wire. This highly flexible adjustment mode enables the support catheter to better adapt to the blood vessel conditions and operation needs of different patients, further improving the universality and applicability of the support catheter, and providing more possibilities for personalized operation treatment plan.

[0024] (4) The setting of the tube distal end developing ring provides clear and explicit identification for the positioning of the tube during the operation. In a complex vascular environment, the doctor can observe the position and direction of the tube in real time and accurately with the help of developing equipment, so as to more accurately control the advancing direction and position of the support catheter, and avoid the operation deviation caused by the misjudgment of the tube position. This design effectively improves the precision of the operation, reduces the operation error, helps to improve the quality and safety of the operation, and brings better treatment experience and prognosis effect to the patient. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein in conjunction with the description of the application. Among these figures:

[0026] Figure 1 Structure diagram of the tube distal end part of an embodiment of the present application;

[0027] Figure 2 Structure diagram of the arc-shaped reinforcing member of an embodiment of the present application;

[0028] Figure 3 Structure diagram of the arc-shaped reinforcing member tightening process of an embodiment of the present application;

[0029] Figure 4 Tube cross-sectional view of an embodiment of the present application.

[0030] In the figure: 100, tube; 110, protective layer; 120, guide layer; 130, support layer; 140, flexibility adjustment section; 141, arc-shaped cavity; 150, arc-shaped reinforcing member; 151, pushing wire; 152, containing groove; 160, pushing channel; 170, tightening wire; 180, first magnetic block; 190, second magnetic block; 191, groove; 192, magnetic block part; 193, limiting part; 200, developing ring. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0032] In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and are not required to be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "connected", "connected" used in the present application should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be directly connected, or indirectly connected through intermediate components; the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances; in addition, in the present application, "distal end" uniformly refers to the end far from the operator, and "proximal end" uniformly refers to the end close to the operator.

[0033] The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0034] The shapes and sizes of the components in the drawings do not reflect the true proportions of the product, but only serve to illustrate the content of the present application.

[0035] The support catheter with adjustable flexibility of the present application is provided with a flexibility adjusting section at the distal end of the tube body, a plurality of arc-shaped cavities are arranged between the protective layer and the guide layer of the section, and an arc-shaped reinforcing member with a shape matched with the arc-shaped cavities is arranged on the tube body close to the proximal end side of the flexibility adjusting section. Before the support catheter is pushed into place, the flexibility adjusting section maintains good flexibility, facilitating the passage in the blood vessel; after the support catheter is pushed into place, the arc-shaped reinforcing member is pushed into the arc-shaped cavities, thereby increasing the support of the flexibility adjusting section, meeting the demand for support performance when pushing the thrombus-removing stent. For details, please refer to the following embodiments.

[0036] Embodiment 1

[0037] As shown in Figures 1-4 , for details, please refer to Figure 1 , Figure 4 , the support catheter with adjustable flexibility comprises a tube body 100, and the tube body 100 is sequentially provided with a protective layer 110, a support layer 130 and a guide layer 120 from outside to inside. Among them, the protective layer 110 can effectively resist external physical damage and possible chemical corrosion, providing a reliable protective barrier for the internal structure of the support catheter. The support layer 130 is used to maintain a certain strength and shape stability of the tube body 100, to ensure that the support catheter can maintain its own form in the complex blood vessel environment and not easily twist or deform, and the guide layer 120 is the innermost structure of the support catheter, which is used to provide a channel for the subsequent thrombus-removing stent to enter the blood vessel.

[0038] The distal end of the tube body 100 is specially provided with a flexible adjustment section 140, which is the key part of the support catheter to realize the function of flexible adjustment. The flexible adjustment section 140 is used to extend out of the sheath tube and extend to the thrombus position. The protective layer 110 and the guide layer 120 of the flexible adjustment section 140 are provided with two symmetrical arc-shaped cavities 141, which provide a space basis for subsequent flexible adjustment. An arc-shaped reinforcing member 150 is movably arranged on one side of the tube body 100 near the proximal end of the flexible adjustment section 140. Specifically, the arc-shaped reinforcing member 150 is not pushed out before the support catheter is nested in the sheath tube during the operation. Therefore, after the arc-shaped reinforcing member 150 is pushed out, the part of the support catheter is still not easy to deform under the action of the sheath tube. The shape of the arc-shaped reinforcing member 150 is matched with the arc-shaped cavity 141. During the early stage of the operation, the flexible adjustment section 140 maintains a good flexible state, and the support catheter can freely shuttle in the tortuous blood vessel and easily avoid the narrow and curved parts of the blood vessel under the guidance of the micro guide wire, thereby minimizing the risk of damage to the blood vessel wall. When the support catheter reaches the target position, the arc-shaped reinforcing member 150 is pushed into the arc-shaped cavity 141, and the support of the flexible adjustment section 140 is significantly enhanced, thereby providing stable and reliable support for the subsequent pushing of the thrombus-removing stent.

[0039] As shown in Figure 2 , in order to realize the convenient pushing of the arc-shaped reinforcing member 150, the proximal end of the arc-shaped reinforcing member 150 is fixedly provided with a pushing wire 151, and the tube body 100 is provided with a pushing channel 160 extending in the axial direction. The pushing wire 151 is arranged in the pushing channel 160 and is in sliding cooperation with the pushing channel 160. The doctor can push the arc-shaped reinforcing member 150 to the target position by operating the pushing wire 151 according to the actual needs, which greatly improves the convenience and controllability of the operation.

[0040] As shown in Figure 2 , Figure 3 , in order to further enhance the support of the arc-shaped reinforcing member 150, a tensioning wire 170 is arranged in the arc-shaped reinforcing member 150 in the axial direction. The tensioning wire 170 axially compresses the arc-shaped reinforcing member 150 after the arc-shaped reinforcing member 150 is pushed into the arc-shaped cavity 141, so as to enhance the support of the arc-shaped reinforcing member 150. The axial compression makes the arc-shaped reinforcing member 150 better bear the task of supporting the thrombus-removing stent, and ensures that the support catheter will not be deformed or displaced when pushing the thrombus-removing stent, thereby providing a strong guarantee for the precise operation of the operation.

[0041] Further, the tensioning of the tensioning wire 170 is realized by a tensioning component. The proximal end of the tensioning wire 170 is fixedly connected with the arc-shaped reinforcing component, and the distal end is provided with a tensioning component. The tensioning component is used to tension the tensioning wire 170.

[0042] Specifically, the tightening component includes a first magnetic block 180 and a second magnetic block 190. The first magnetic block 180 is fixedly connected to the distal end of the tightening wire 170, and the second magnetic block 190 is fixedly arranged at the distal end of the arc-shaped chamber 141. The proximal end of the second magnetic block 190 is provided with a groove 191 with a cross-sectional area not smaller than that of the first magnetic block 180. The depth of the groove 191 along the axial direction is greater than the height of the first magnetic block 180 along the axial direction. In this way, when the left side of the first magnetic block 180 contacts the bottom surface of the groove 191, the end surface of the distal end of the arc-shaped reinforcing member 150 abuts against the second magnetic block 190. The arc-shaped reinforcing member 150 is axially contracted under the axial pulling of the tightening wire 170, thereby enhancing its supportability.

[0043] Further, the second magnetic block 190 is designed to have a structure in which a magnetic block portion 192 and a limiting portion 193 are sequentially fixedly arranged from the distal end to the proximal end. The groove 191 is arranged in the limiting portion 193. This structure not only ensures that the first magnetic block 180 falls into the groove 191 and tightens the tightening wire 170, but also precisely limits the first magnetic block 180, preventing unnecessary shaking or displacement of the first magnetic block 180 in the groove 191, thereby further improving the stability and reliability of the entire tightening structure. Meanwhile, the bottom of the groove 191 extends to the boundary position between the magnetic block portion 192 and the limiting portion 193. This design makes the magnetic action more reasonable and efficient, ensuring that the magnetic force between the first magnetic block 180 and the second magnetic block 190 can fully play a role, thereby achieving stable tightening of the tightening wire 170.

[0044] Further, the first magnetic block 180 and the second magnetic block 190 are both electromagnets. The characteristics of electromagnets enable doctors to flexibly adjust the magnetic strength and polarity of the magnetic blocks by accurately controlling the size and direction of the current according to the specific conditions in actual surgeries. This highly flexible adjustment mode provides doctors with more operation options and adjustment space. For example, in the case of different blood vessel conditions and thrombus positions of different patients, doctors can adjust the magnetism of the electromagnets in real time according to actual needs, thereby accurately controlling the tightening degree of the tightening wire 170, so that the support catheter can better adapt to various complex surgical environments, further improving the universality and applicability of the support catheter. For another example, when pushing the arc-shaped reinforcing member 150 to the distal end, the first magnetic block 180 and the second magnetic block 190 are attracted to each other by controlling the current direction, thereby making the pushing of the arc-shaped reinforcing member 150 more smooth. After the surgery is completed, the first magnetic block 180 and the second magnetic block 190 can be repelled from each other by controlling the current direction, thereby facilitating the pulling back of the arc-shaped reinforcing member 150.

[0045] Further, the arc-shaped reinforcing member 150 is provided with a receiving groove 152 at the distal end for accommodating the first magnetic block 180, and the depth of the receiving groove 152 in the axial direction is not less than the height of the first magnetic block 180 in the axial direction. This design provides a stable placement space for the first magnetic block 180, ensuring that the first magnetic block 180 can be stably placed on the arc-shaped reinforcing member 150 before being matched with the second magnetic block 190, and will not accidentally shake or fall off. At the same time, the appropriate depth design also ensures that the first magnetic block 180 can be smoothly matched with the second magnetic block 190 when needed, realizing the function of tensioning the tight wire 170, and can further increase the tightness of the tight wire 170.

[0046] Further, the tube body 100 is provided with a developing ring 200 at the distal end for positioning the position of the tube body 100. During the operation, the doctor can clearly observe the position of the developing ring 200 through the rays emitted by the angiography equipment. This enables the doctor to accurately grasp the specific position and direction of the tube body 100 in the blood vessel in real time, so as to more accurately control the advancing direction and depth of the support catheter. Whether in the pushing process of the support catheter or in the subsequent thrombus removal operation, the developing ring 200 provides key position information for the doctor, avoiding operation deviation caused by incorrect judgment of the position of the tube body 100, and greatly improving the accuracy and safety of the operation.

[0047] Working principle of the present application:

[0048] In the early pushing process of the support catheter, the support catheter first travels in the sheath under the guidance of the micro guide wire, and after reaching the distal end of the sheath, the support catheter extends from the distal end of the sheath and pushes towards the thrombus position.

[0049] When the support catheter reaches the vicinity of the thrombus position, the doctor pushes the arc-shaped reinforcing member 150 along the pushing channel 160 to the arc-shaped chamber 141 of the compliant adjustment section 140 by pushing the wire 151. Since the shape of the arc-shaped reinforcing member 150 is matched with the arc-shaped chamber 141, the arc-shaped reinforcing member 150 can smoothly enter the arc-shaped chamber 141, and at this time the compliant adjustment section 140 of the support catheter is strengthened and the support is improved.

[0050] At the same time, after the arc-shaped reinforcing member 150 enters the arc-shaped chamber 141, the tight wire 170 begins to function. Due to the mutual attraction of the first magnetic block 180 and the second magnetic block 190, the first magnetic block 180 falls into the groove 191 near the proximal end of the second magnetic block 190, tensioning the tight wire 170, and the tight wire 170 axially compresses the arc-shaped reinforcing member 150, further enhancing the support of the arc-shaped reinforcing member 150, ensuring that the support catheter can remain stable when pushing the thrombus removal stent.

[0051] In summary, the support catheter with adjustable compliance provided by the application effectively solves the problem that the existing support catheter cannot balance the compliance and supportability through a series of ingenious structural designs, and provides a more reliable tool for the surgical treatment of ischemic stroke.

[0052] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0053] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is within the protection scope of the claims of the present application.

Claims

1. A support catheter with adjustable compliance, comprising a tube body (100) having a protective layer (110) disposed at the outermost side and a guide layer (120) disposed at the innermost side, a support layer (130) being disposed between the protective layer (110) and the guide layer (120), characterized in that, The pipe body (100) has a flexible adjustment section (140) at the distal end, the flexible adjustment section (140) is used to extend the sheath tube to the thrombus position, a plurality of arc-shaped cavities (141) are arranged between the protective layer (110) and the guide layer (120) of the flexible adjustment section (140), an arc-shaped reinforcing part (150) is movably arranged on the pipe body (100) near the proximal end of the flexible adjustment section (140), the shape of the arc-shaped reinforcing part (150) is matched with the arc-shaped cavities (141), and in operation, after the pipe body (100) is pushed to the position, the arc-shaped reinforcing part (150) is pushed into the arc-shaped cavities (141) to increase the supportability of the flexible adjustment section (140). The arc-shaped reinforcing part (150) is arranged with a tensioning wire (170) in the axial direction, and the tensioning wire (170) is used to axially compress the arc-shaped reinforcing part (150) after the arc-shaped reinforcing part (150) is pushed into the arc-shaped cavities (141), so as to enhance the supportability of the arc-shaped reinforcing part (150). The proximal end of the tensioning wire (170) is fixedly connected with the arc-shaped reinforcing part, and the distal end is provided with a tensioning part used for tensioning the tensioning wire (170). The tensioning part comprises a first magnetic block (180) and a second magnetic block (190), the first magnetic block (180) is fixedly connected with the distal end of the tensioning wire (170), the second magnetic block (190) is fixedly arranged at the distal end of the arc-shaped cavity (141), the proximal end of the second magnetic block (190) is provided with a groove (191) with a cross section not smaller than that of the first magnetic block (180), and the depth dimension of the groove (191) in the axial direction is greater than the height dimension of the first magnetic block (180) in the axial direction, so that the first magnetic block (180) is pulled into the groove (191) to tension the tensioning wire (170).

2. The support catheter of claim 1, wherein, The proximal end of the arc-shaped reinforcing part (150) is fixedly provided with a pushing wire (151), and the pipe body (100) is provided with a pushing channel (160) extending in the axial direction, the pushing wire (151) is arranged in the pushing channel (160) and is in sliding fit with the pushing channel (160).

3. The support catheter of claim 1, wherein, The second magnetic block (190) comprises a magnetic block part (192) and a limiting part (193) which are fixedly arranged in sequence from the distal end to the proximal end, and the groove (191) is arranged in the limiting part (193).

4. The support catheter of claim 3, wherein the at least one of the plurality of segments is configured to be selectively inflated to adjust the flexibility of the support catheter. The bottom of the groove (191) extends to the boundary position between the magnetic block part (192) and the limiting part (193).

5. The support catheter of claim 1, wherein, The first magnetic block (180) and the second magnetic block (190) are both electromagnets.

6. The support catheter of claim 1, wherein, The distal end of the arc-shaped reinforcing part (150) is provided with a containing groove (152) used for containing the first magnetic block (180), and the depth dimension of the containing groove (152) in the axial direction is not less than the height dimension of the first magnetic block (180) in the axial direction.

7. The support catheter of any of claims 1-6, wherein the support catheter is formed from a material having a durometer of about 60A to about 90A. The distal end of the pipe body (100) is provided with a developing ring (200) used for positioning the position of the pipe body (100).

Images