Supporting catheter with adjustable flexibility

Abstract

The invention provides a supporting catheter with adjustable flexibility, and belongs to the technical field of medical instruments. Comprising a catheter body, the catheter body is provided with a protective layer arranged on the outermost side and a guide layer arranged on the innermost side, a supporting layer is arranged between the protective layer and the guide layer, the far end of the catheter body is provided with a flexibility adjusting section, and the flexibility adjusting section is used for extending out of the sheath catheter to the thrombus position. A plurality of arc-shaped cavities are formed between the protective layer and the guide layer of the flexibility adjusting section, an arc-shaped reinforcing piece is movably arranged on the side, close to the near end of the flexibility adjusting section, of the pipe body, and the shape of the arc-shaped reinforcing piece is matched with that of the arc-shaped cavities. The arc-shaped reinforcing piece is pushed into the arc-shaped cavity so as to increase the supporting performance of the flexibility adjusting section; the technical problems existing in a supporting catheter in the prior art are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a support catheter with adjustable compliance. Background Art

[0002] "Cerebral stroke" is also called "stroke" or "cerebral vascular accident" (CVA). It is an acute cerebrovascular disease, a group of diseases that cause brain tissue damage due to sudden rupture of brain blood vessels or blood vessel blockage that prevents blood from flowing into the brain, including ischemic and hemorrhagic strokes. The incidence of ischemic stroke is higher than that of hemorrhagic stroke, accounting for 60% to 70% of the total number of strokes.

[0003] One of the main causes of ischemic stroke is the presence of blood clots in the cerebral blood vessels, which leads to vascular embolism and reduces the blood circulation performance in the blood vessels.

[0004] Surgery is usually used to treat vascular embolism and has a more significant effect. Specifically, during the operation, the doctor first delivers a sheath into the blood vessel through the patient's femoral artery to establish an instrument delivery channel. Due to the delivery function of the sheath, the diameter of the catheter cannot be designed to be too narrow. Therefore, the sheath generally cannot support the thrombus location, but reaches a position a certain distance from the thrombus. At this time, a supporting catheter is delivered into the body through the sheath. The diameter of the supporting catheter is thinner than that of the sheath, so it can be extended from the distal end of the sheath. The supporting catheter is further pushed toward the thrombus location until it reaches the thrombus location, and then the thrombus removal stent is delivered to the thrombus location through the supporting catheter.

[0005] In the above process, when the support catheter extends from the distal end of the sheath and advances toward the location of the thrombus, the overall flexibility of the support catheter needs to be good, so that it can pass through the tortuous blood vessels easily without damaging the blood vessels. However, when the support catheter is in place, the support catheter is required to have corresponding supporting properties in the process of pushing the thrombus removal stent to the location of the thrombus through the support catheter, so that it is not easy to be displaced so that the thrombus removal stent can be accurately pushed to the location of the thrombus.

[0006] However, the flexibility of the existing support catheter is determined from the moment it is processed, and it is impossible to meet the flexibility requirements in the early stage while also meeting the support performance requirements in the later stage.

[0007] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0008] The object of the present invention is to provide a support catheter with adjustable compliance to solve the above-mentioned technical problems existing in the support catheter in the prior art.

[0009] In order to achieve the above-mentioned purpose, the support catheter with adjustable compliance of the present invention provides the following technical solutions:

[0010] A support catheter with adjustable compliance comprises a tube body, wherein the tube body has a protective layer arranged on the outermost side and a guide layer arranged on the innermost side, a support layer is arranged between the protective layer and the guide layer, a compliance adjustment section is arranged at the distal end of the tube body, the compliance adjustment section is used to extend out of the sheath to the location of the thrombus, a plurality of arc-shaped chambers are arranged between the protective layer and the guide layer of the compliance adjustment section, an arc-shaped reinforcement piece is movably arranged on one side of the tube body near the proximal end of the compliance adjustment section, the shape of the arc-shaped reinforcement piece is adapted to the arc-shaped chamber, and when working, after the tube body is pushed into place, the arc-shaped reinforcement piece is pushed into the arc-shaped chamber to increase the support of the compliance adjustment section.

[0011] As a further optimized technical solution, a push wire is fixedly provided at the proximal end of the arc-shaped reinforcement, and a push channel extending along the axial direction is provided on the tube body. The push wire is arranged in the push channel and slidably cooperates with the push channel.

[0012] As a further optimized technical solution, a tension wire is axially arranged inside the arc-shaped reinforcement member. After the arc-shaped reinforcement member is pushed into the arc-shaped chamber, the tension wire axially compresses the arc-shaped reinforcement member to enhance the support of the arc-shaped reinforcement member.

[0013] As a further optimized technical solution, the proximal end of the tensioning wire is fixedly connected to the arc-shaped reinforcing component, and the distal end is provided with a tensioning component, which is used to tighten the tensioning wire.

[0014] As a further optimized technical solution, the tensioning component includes a first magnetic block and a second magnetic block. The first magnetic block is fixedly connected to the distal end of the tensioning wire, and the second magnetic block is fixedly arranged at the distal end of the arc-shaped chamber. 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 along the axial direction is greater than the height dimension of the first magnetic block along the axial direction, so that the tensioning wire can be tightened after the first magnetic block falls into the groove.

[0015] As a further optimized technical solution, the second magnetic block includes 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 between the magnetic block part and the limiting part.

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

[0018] As a further optimized technical solution, a receiving groove for receiving the first magnetic block is provided at the distal end of the arc-shaped reinforcement member, and the depth dimension of the receiving groove along the axial direction is not less than the height dimension of the first magnetic block along the axial direction.

[0019] As a further optimized technical solution, a developing ring for locating the position of the tube body is provided at the distal end of the tube body.

[0020] Beneficial effects:

[0021] (1) The support catheter of the present invention breaks through the limitation of the fixed flexibility of the traditional support catheter, and can flexibly and accurately adjust the flexibility and support of the distal end of the support catheter according to the different needs of the surgical process. In the early stage, when the support catheter passes through the tortuous blood vessels, the good flexibility can effectively avoid damage to the blood vessel wall and reduce the risk of complications such as blood vessel rupture and bleeding during the operation; and in the later stage of pushing the thrombectomy stent, the reliable support ensures that the thrombectomy stent can be accurately delivered to the thrombus position, significantly improving the success rate of thrombectomy, thereby improving the overall surgical treatment effect and providing a stronger guarantee for the patient's recovery.

[0022] (2) The design of this support catheter fully considers the convenience and reliability of clinical operation. The reasonable setting of the push wire and the push channel allows the doctor to easily and smoothly push the arc-shaped reinforcement to the target position - the arc-shaped chamber. The operation process is simple and direct, reducing the risk of extended operation time and errors caused by complex operations. At the same time, the coordinated work of the tensioning wire and the tensioning components composed of magnetic blocks not only effectively strengthens the arc-shaped reinforcement, but also this structural design has a high degree of stability and reliability. It can always maintain a good working state during the operation, providing solid technical support for the smooth progress of the 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. Doctors can flexibly adjust the magnetic strength and polarity of the magnetic blocks by precisely controlling the magnitude and direction of the current according to the specific circumstances of the actual operation, thereby achieving fine adjustment of the tension of the tension wire. This highly flexible adjustment method enables the support catheter to better adapt to the vascular conditions and surgical needs of different patients, further improving the versatility and applicability of the support catheter, and providing more possibilities for personalized surgical treatment plans.

[0024] (4) The setting of the developing ring at the distal end of the tube provides a clear and unambiguous mark for the positioning of the tube during the operation. In a complex vascular environment, the doctor can use the developing equipment to observe the position and direction of the tube in real time and accurately, so as to more accurately control the forward direction and position of the supporting catheter and avoid surgical deviations caused by misjudgment of the tube position. This design effectively improves the accuracy of surgical operations, reduces surgical errors, helps to improve the quality and safety of surgery, and brings better treatment experience and prognosis to patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0026] Figure 1 This is a schematic structural diagram of the distal end portion of the tube body according to an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of an arc-shaped reinforcement member according to an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of a tightening process of an arc-shaped reinforcement member according to an embodiment of the present invention;

[0029] Figure 4 The figure is a schematic cross-sectional view of a tube body according to an embodiment of the present invention.

[0030] In the figure: 100, tube body; 110, protective layer; 120, guide layer; 130, support layer; 140, flexibility adjustment section; 141, arc chamber; 150, arc reinforcement member; 151, push wire; 152, accommodating groove; 160, push channel; 170, tension 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 invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0032] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. In addition, in the present invention, "distal end" uniformly refers to the end away from the operator, and "proximal end" uniformly refers to the end close to the operator.

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

[0034] The shapes and sizes of the components in the drawings do not reflect the actual proportions of the products, and are only intended to illustrate the contents of the present invention.

[0035] The support catheter with adjustable compliance of the present invention is provided with a compliance adjustment section at the distal end of the tube body, and a plurality of arc-shaped chambers are provided between the protective layer and the guide layer of the section, and an arc-shaped reinforcement member whose shape matches the arc-shaped chamber is provided on the tube body near the proximal end of the compliance adjustment section. Before the support catheter is pushed into place, the compliance adjustment section maintains good compliance to facilitate passing through the blood vessel; when the support catheter is pushed into place, the arc-shaped reinforcement member is pushed into the arc-shaped chamber, thereby increasing the support of the compliance adjustment section and meeting the support performance requirements when pushing the thrombectomy stent. Please refer to the following embodiments for details.

[0036] Example 1

[0037] like Figure 1-4 For details, please refer to Figure 1 , Figure 4 The support catheter with adjustable compliance performance includes 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 the outside to the inside. Among them, the protective layer 110 can effectively resist external physical damage and possible chemical erosion, and provide 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, ensuring that the support catheter can maintain its own shape in a complex vascular environment and is not easily twisted or deformed. The guide layer 120, as the innermost structure of the support catheter, is used to provide a channel for the subsequent thrombectomy stent to enter the blood vessel.

[0038] A flexibility adjustment section 140 is specially provided at the distal end of the tube body 100. This design is the key part of the support catheter to achieve the flexibility adjustment function. The flexibility adjustment section 140 is used to extend out of the sheath to the location of the thrombus. Two symmetrically arranged arc chambers 141 are arranged between the protective layer 110 and the guide layer 120 of the flexibility adjustment section 140, which provide a spatial basis for the subsequent adjustment of the flexibility performance. An arc-shaped reinforcement member 150 is movably provided on one side of the tube body 100 near the proximal end of the flexibility adjustment section 140. Specifically, during the operation, the arc-shaped reinforcement member 150 does not push the support catheter part that was previously nested in the sheath. In this way, after the arc-shaped reinforcement member 150 is pushed out, under the action of the sheath, this part of the support catheter is still not easy to deform. The shape of the arc-shaped reinforcement piece 150 is adapted to the arc-shaped chamber 141. When working, in the early stage of pushing the support catheter to the thrombus position, the flexibility adjustment section 140 maintains a good flexibility state. At this time, the support catheter can freely shuttle in the tortuous blood vessels, and under the guidance of the micro-guidewire, it can easily avoid the narrow and curved parts of the blood vessels, thereby minimizing the risk of damage to the blood vessel wall. When the support catheter reaches the target position, by pushing the arc-shaped reinforcement piece 150 into the arc-shaped chamber 141, the support of the flexibility adjustment section 140 is significantly enhanced, which can provide stable and reliable support for the subsequent pushing of the thrombus removal stent.

[0039] like Figure 2 As shown, in order to facilitate the pushing of the arc-shaped reinforcement member 150, a pushing wire 151 is fixedly provided at the proximal end of the arc-shaped reinforcement member 150, and a pushing channel 160 extending along the axial direction is provided on the tube body 100, and the pushing wire 151 is arranged in the pushing channel 160 and slidably cooperates with the pushing channel 160. The doctor can push the arc-shaped reinforcement member 150 to the target position by operating the pushing wire 151 according to actual needs, and this design greatly improves the convenience and controllability of the operation.

[0040] like Figure 2 , Figure 3 As shown, in order to further enhance the supportability of the arc-shaped reinforcement member 150, a tension wire 170 is arranged axially inside the arc-shaped reinforcement member 150. After the arc-shaped reinforcement member 150 is pushed into the arc-shaped chamber 141, the tension wire 170 axially compresses the arc-shaped reinforcement member 150 to enhance the supportability of the arc-shaped reinforcement member 150. This axial compression effect enables the arc-shaped reinforcement member 150 to better assume the task of supporting the thrombectomy stent, ensuring that the supporting catheter will not be excessively deformed or displaced when pushing the thrombectomy stent, providing a strong guarantee for the precise operation of the surgery.

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

[0042] Specifically, the tensioning 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 tensioning 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 whose cross-section is not smaller than that of the first magnetic block 180, and the axial depth dimension of the groove 191 is greater than the axial height dimension of the first magnetic block 180. In this way, when the left side surface of the first magnetic block 180 contacts the bottom surface of the groove 191, the distal end face of the arc-shaped reinforcement member 150 presses against the second magnetic block 190, and the arc-shaped reinforcement member 150 produces axial contraction under the axial pull of the tensioning wire 170, thereby enhancing its support.

[0043] Furthermore, the second magnetic block 190 adopts a structural design in which a magnetic block portion 192 and a limiting portion 193 are fixedly arranged in sequence from the distal end to the proximal end. The groove 191 is arranged in the limiting portion 193. This structural design can not only ensure that the first magnetic block 180 smoothly falls into the groove 191 and tightens the tension wire 170, but also play a precise limiting role for the first magnetic block 180, preventing the first magnetic block 180 from unnecessary shaking or displacement in the groove 191, further improving the stability and reliability of the entire tensioning structure. At the same time, the bottom of the groove 191 extends to the interface position between the magnetic block portion 192 and the limiting portion 193. This design makes the magnetic effect 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 tension wire 170.

[0044] Furthermore, both the first magnetic block 180 and the second magnetic block 190 are electromagnets. The characteristics of electromagnets allow doctors to flexibly adjust the magnetic strength and polarity of the magnetic blocks by precisely controlling the magnitude and direction of the current according to the specific circumstances of the actual operation. This highly flexible adjustment method provides doctors with more operation options and adjustment space. For example, in the case of different vascular conditions and thrombus locations of different patients, doctors can adjust the magnetism of the electromagnet in real time according to actual needs, thereby precisely controlling the tension of the tension wire 170, so that the support catheter can better adapt to various complex surgical environments, further improving the versatility and applicability of the support catheter. For another example, when pushing the arc-shaped reinforcement member 150 to the distal end, by controlling the direction of the current, the first magnetic block 180 and the second magnetic block 190 are attracted to each other, so that the pushing of the arc-shaped reinforcement member 150 is smoother. After the operation is completed, the first magnetic block 180 and the second magnetic block 190 can be repelled from each other by controlling the direction of the current, so as to facilitate the pulling back of the arc-shaped reinforcement member 150.

[0045] Furthermore, a receiving groove 152 for receiving the first magnetic block 180 is provided at the far end of the arc-shaped reinforcement member 150, and the depth dimension of the receiving groove 152 along the axial direction is not less than the height dimension of the first magnetic block 180 along 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 firmly placed on the arc-shaped reinforcement member 150 before it is matched with the second magnetic block 190, and will not accidentally shake or fall off. At the same time, the appropriate depth dimension design also ensures that when necessary, the first magnetic block 180 can smoothly match with the second magnetic block 190 to achieve the function of tightening the tension wire 170, and can further increase the tension of the tension wire 170.

[0046] Furthermore, a developing ring 200 for locating the position of the tube body 100 is provided at the distal end 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 device. This enables the doctor to grasp the specific position and direction of the tube body 100 in the blood vessel in real time and accurately, so as to more accurately control the advancing direction and depth of the supporting catheter. Whether in the pushing process of the supporting catheter or in the subsequent thrombectomy operation, the developing ring 200 provides the doctor with key position information, avoiding surgical deviations caused by misjudgment of the position of the tube body 100, and greatly improving the accuracy and safety of the surgical operation.

[0047] Working principle of the present invention:

[0048] In the early stage of pushing the support catheter, the support catheter first passes through the sheath under the guidance of the microguidewire. After reaching the distal end of the sheath, the support catheter extends from the distal end of the sheath and is pushed toward the thrombus position.

[0049] When the supporting catheter reaches the vicinity of the thrombus, the doctor pushes the arc-shaped reinforcement member 150 through the pushing wire 151, so that it moves along the pushing channel 160 toward the arc-shaped chamber 141 of the compliance adjustment section 140. Since the shape of the arc-shaped reinforcement member 150 is adapted to the arc-shaped chamber 141, the arc-shaped reinforcement member 150 can smoothly enter the arc-shaped chamber 141, and at this time, the compliance adjustment section 140 of the supporting catheter is strengthened, and the support is improved.

[0050] At the same time, after the arc-shaped reinforcement member 150 enters the arc-shaped chamber 141, the tension wire 170 starts to work. Due to the mutual attraction between the first magnetic block 180 and the second magnetic block 190, the first magnetic block 180 falls into the groove 191 at the proximal end of the second magnetic block 190, tightening the tension wire 170, and the tension wire 170 axially compresses the arc-shaped reinforcement member 150, further enhancing the support of the arc-shaped reinforcement 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 present invention, through a series of ingenious structural designs, effectively solves the problem that existing support catheters cannot take into account both flexibility and support, and provides a more reliable tool for surgical treatment of ischemic stroke.

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

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A support catheter with adjustable compliance, comprising a tube body (100), wherein the tube body (100) has a protective layer (110) arranged on the outermost side and a guide layer (120) arranged on the innermost side, and a support layer (130) is arranged between the protective layer (110) and the guide layer (120), characterized in that: The distal end of the tube body (100) is provided with a flexibility adjustment section (140), which is used to extend out of the sheath to the location of the thrombus, and a plurality of arc-shaped chambers (141) are arranged between the protective layer (110) and the guide layer (120) of the flexibility adjustment section (140), and an arc-shaped reinforcement member (150) is movably arranged on one side of the tube body (100) close to the proximal end of the flexibility adjustment section (140), and the shape of the arc-shaped reinforcement member (150) is adapted to the arc-shaped chamber (141). When in operation, after the tube body (100) is pushed into place, the arc-shaped reinforcement member (150) is pushed into the arc-shaped chamber (141) to increase the support of the flexibility adjustment section (140).

2. The support catheter with adjustable compliance according to claim 1, characterized in that: A push wire (151) is fixedly disposed at the proximal end of the arc-shaped reinforcement member (150), and a push channel (160) extending in the axial direction is disposed on the tube body (100), and the push wire (151) is disposed in the push channel (160) and slidably cooperates with the push channel (160).

3. The support catheter with adjustable compliance according to claim 1, characterized in that: A tension wire (170) is axially arranged inside the arc-shaped reinforcement member (150). After the arc-shaped reinforcement member (150) is pushed into the arc-shaped chamber (141), the tension wire (170) axially compresses the arc-shaped reinforcement member (150) to enhance the support of the arc-shaped reinforcement member (150).

4. The support catheter with adjustable compliance according to claim 3, characterized in that: The proximal end of the tension wire (170) is fixedly connected to the arc-shaped reinforcing component, and the distal end is provided with a tensioning component, which is used to tighten the tension wire (170).

5. The support catheter with adjustable compliance according to claim 4, characterized in that: The tightening component comprises a first magnetic block (180) and a second magnetic block (190), wherein 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), and the proximal end of the second magnetic block (190) is provided with a groove (191) whose cross section is not smaller than that of the first magnetic block (180), and the axial depth dimension of the groove (191) is greater than the axial height dimension of the first magnetic block (180), so that the first magnetic block (180) falls into the groove (191) and tightens the tightening wire (170).

6. The support catheter with adjustable compliance according to claim 5, characterized in that: The second magnetic block (190) comprises a magnetic block portion (192) and a limiting portion (193) which are fixedly arranged in sequence from the distal end to the proximal end, and the groove (191) is arranged in the limiting portion (193).

7. The support catheter with adjustable compliance according to claim 6, characterized in that: The bottom of the groove (191) extends to the interface between the magnetic block part (192) and the limiting part (193).

8. The support catheter with adjustable compliance according to claim 5, characterized in that: The first magnetic block (180) and the second magnetic block (190) are both electromagnets.

9. The support catheter with adjustable compliance according to claim 1, characterized in that: The arc-shaped reinforcement member (150) is provided with a receiving groove (152) at the far end thereof for receiving the first magnetic block (180), and the depth dimension of the receiving groove (152) along the axial direction is not less than the height dimension of the first magnetic block (180) along the axial direction.

10. The support catheter with adjustable compliance according to any one of claims 1 to 9, characterized in that: A developing ring (200) for locating the position of the tube body (100) is arranged at the distal end of the tube body (100).

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