Supporting catheter

Abstract

The utility model provides a supporting catheter, and belongs to the technical field of interventional operation instruments. The supporting catheter comprises a catheter body, an adjusting section is arranged at the far end of the catheter body, the adjusting section is used for extending to the thrombus position from the far end of a catheter sheath, a spirally-extending groove is formed in the inner side wall of the adjusting section, a filling component is arranged at the position, located at the near end of the adjusting section, in a catheter cavity of the catheter body, and the groove can be filled with the filling component. The supporting performance of the adjusting section is improved; accurate switching between flexibility and supporting performance in different stages is achieved, and the thrombectomy stent conveying accuracy and the interventional operation success rate are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the intervention operation instrument technical field, concretely relates to a support catheter. BACKGROUND

[0002] When removing the thrombus in the brain blood vessel through the intervention operation, the doctor needs to firstly push a catheter sheath into the patient's body to the position near the thrombus, because the diameter of the catheter sheath is larger, so it cannot directly reach the thrombus position, then a support catheter with smaller diameter is pushed into the catheter sheath, the support catheter can directly reach the thrombus position, and then a thrombus removing stent is pushed to the thrombus position through the support catheter.

[0003] In the above operation process, when the support catheter extends from the distal end of the catheter sheath and continues to travel to the distal end of the blood vessel, the brain blood vessel is thin and has many bends, therefore, in order to avoid damaging the blood vessel and ensure that the support catheter can smoothly reach the thrombus position, the support catheter needs to have high flexibility, when the thrombus removing stent needs to be delivered into the support catheter after reaching the thrombus position, if the flexibility of the support catheter is still high at this time, the support catheter is prone to displacement during the pushing process of the thrombus removing stent, especially in the section from the distal end of the catheter sheath to the thrombus, so that the thrombus removing stent cannot be accurately delivered.

[0004] Therefore, it is necessary to provide an improved technical solution for the above-mentioned deficiencies of the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a support catheter, which can accurately switch the flexibility and supportability at different stages, and improve the thrombus removing stent delivery accuracy and the success rate of the intervention operation.

[0006] In order to achieve the above-mentioned purpose, the support catheter of the utility model provides the following technical solutions:

[0007] As a further optimized technical solution, the tube body is provided with an adjusting section at the distal end, the adjusting section is used for extending from the distal end of the catheter sheath to the thrombus position, a spiral extending groove is formed on the inner side wall of the adjusting section, and a filling part is arranged in the proximal end of the adjusting section in the lumen of the tube body, the filling part can be filled into the groove to increase the supportability of the adjusting section.

[0008] As a further optimized technical solution, the tube body comprises a protective layer, a reinforcing layer and a lumen layer arranged in sequence from outside to inside, the lumen layer has soft elasticity, and the groove is arranged on the lumen layer.

[0009] As a further optimization technical solution, the filling component is a helical reinforcing structure, the reinforcing structure has a plurality of continuous annular helical wires, and a proximal end of the reinforcing structure is provided with a driving structure for driving the reinforcing structure to rotate into the groove.

[0010] As a further optimization technical solution, the driving structure is a guide wire extending to the proximal end along the lumen of the tube body.

[0011] As a further optimization technical solution, before the reinforcing structure is filled, at least one annular helical wire at the distal end of the reinforcing structure is located at the proximal end of the groove.

[0012] As a further optimization technical solution, the distal end of the tube body is provided with a developing component.

[0013] As a further optimization technical solution, the cross section of the reinforcing structure is circular, and the cross section of the groove is semicircular.

[0014] As a further optimization technical solution, the cross section of the reinforcing structure is H-shaped, and the filling component is partially clamped in the groove and in sliding fit with the groove.

[0015] As a further optimization technical solution, the cross section of the reinforcing structure is triangular, and the shape of the cross section of the groove is triangular.

[0016] As a further optimization technical solution, the cross section of the reinforcing structure is isosceles triangular, and the base of the isosceles triangle faces the inside.

[0017] Beneficial effects: By setting the adjusting section with the helical groove at the distal end of the tube body, and cooperating with the filling component that can be filled into the groove, the precise demand switching of the support catheter in different stages for flexibility and support is realized. Before reaching the thrombus position, the filling component is not filled into the groove, and the adjusting section presents high flexibility, so as to facilitate the shuttle in the winding and tortuous brain blood vessels with thin diameter, effectively avoid unnecessary damage to the blood vessel wall, and provide a strong guarantee for smoothly reaching the thrombus position. When the thrombus stent needs to be delivered, the filling component is filled into the groove, and the adjusting section instantaneously obtains strong support, so as to ensure that the thrombus stent can stably move forward in the pushing process, and accurately and accurately reaches the target position, greatly improving the accuracy of the thrombus stent delivery, and thereby significantly improving the success rate of the interventional operation. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application. The use of the same reference numbers in different drawings and / or the use of the same reference designators in the drawings and the description is intended to indicate the same or similar elements.

[0019] Figure 1It is the pipe body far end structure schematic view of embodiment 1 of the utility model;

[0020] Figure 2 It is the pipe body far end sectional view schematic view of embodiment 1 of the utility model;

[0021] Figure 3 It is the recess and filling part cooperation schematic view of embodiment 2 of the utility model;

[0022] Figure 4 It is the recess and filling part cooperation schematic view of embodiment 3 of the utility model.

[0023] In the drawing: 1, pipe body;101, adjustment section;102, recess;103, protective layer;104, reinforcing layer;105, lumen layer;2, filling part;3, drive structure;4, developing part. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely below, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art belong to the scope of protection of the utility model.

[0025] In the description of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like is the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and does not require the utility model to be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. The terms "connected", "connected" used in the utility model should be understood broadly, for example, it can be fixed connection, can also be detachable connection;It can be directly connected, or indirectly connected through an intermediate part;For the person skilled in the art, the specific meaning of the above terms can be understood according to the specific situation;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.

[0026] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0027] The shape and size of each component in the drawings do not reflect the true proportion of the product, and the purpose is only to illustrate the content of the application.

[0028] The core purpose of the utility model lies in providing a kind of support catheter to overcome the key problem faced by support catheter in interventional surgery process in prior art-high softness is urgently needed before reaching thrombus position, and high support is urgently needed in the stage of conveying thrombus-removing stent, this contradictory dilemma.

[0029] Embodiment 1

[0030] As Figure 1 、 Figure 2 Indicated, support catheter includes tube body 1, and tube body 1 includes protective layer 103, reinforcing layer 104 and lumen layer 105 arranged in sequence from outside to inside. Among them, protective layer 103 is generally made of polyurethane or polytetrafluoroethylene or silicone rubber, is used for protecting support catheter in all directions, so that it can resist various possible physical damage and chemical erosion in complex in-vivo environment. Reinforcing layer 104 is used to give support catheter sufficient strength and stability, to ensure that deformation or damage does not easily occur in the process of surgical operation. Lumen layer 105 is generally made of polyether ether ketone or polyurethane or silicone or polyvinyl chloride, and has soft elasticity.

[0031] The distal end of tube body 1 is provided with adjustment section 101, and adjustment section 101 is used to extend from the distal end of guide sheath tube to thrombus position. The inner side wall of adjustment section 101 is provided with helically extending groove 102, and the opening of groove 102 effectively increases the softness of tube body 1. The proximal end of tube body 1 is provided with filling component 2 in the lumen of adjustment section 101, and filling component 2 can be filled into groove 102 to increase the support of adjustment section 101.

[0032] Specifically, groove 102 is completely opened on lumen layer 105, and when placing filling component 2 into groove 102, even if groove 102 is slightly deformed, filling component 2 can expand the deformed groove 102 and smoothly fill into groove 102.

[0033] In the embodiment, filling component 2 is a helical reinforcing structure, and the reinforcing structure has a plurality of continuous annular helical wires. The proximal end of the reinforcing structure is provided with driving structure 3 for driving the rotation of the reinforcing structure to enter groove 102. Specifically, driving structure 3 is a guide wire, which extends to the proximal end along the lumen of tube body 1. Thus, it is convenient for doctors to operate during surgery, so that doctors can accurately control the movement of filling component 2, which provides a strong guarantee for the smooth progress of surgery.

[0034] Preferably, the guide wire is symmetrically provided with two on the reinforcing structure, so that it is more convenient to rotate the reinforcing structure.

[0035] Furthermore, to facilitate the smooth filling of the filling component 2 into the groove 102, three to four annular spiral wires at the distal end of the reinforcing structure are pre-filled into the proximal end of the groove 102 before the filling component 2 is filled. In this way, the pre-connection between the filling component 2 and the groove 102 ensures that the filling component 2 can quickly and smoothly enter the groove 102 when needed.

[0036] Furthermore, in order to enable real-time and precise observation of the position of the support catheter during the operation, a contrast-enhancing component 4 is thoughtfully provided at the distal end of the tube body 1.

[0037] In this embodiment, the cross-section of the reinforcing structure is circular, and the cross-section of the groove 102 is semi-circular. The outer diameter of the reinforcing structure matches the inner diameter of the groove 102. Specifically, the reinforcing structure is slightly compressed radially during installation, so that the reinforcing structure is stably located in the cavity of the tube body 1. When it is necessary to fill the groove 102 with the reinforcing structure, the reinforcing structure is rotated, and the reinforcing structure gradually fills the groove 102. The radial dimension of the groove 102 is the same as that of the reinforcing structure, so that the reinforcing structure expands radially after being filled into the groove 102, so as to ensure that it is stably filled in the groove 102.

[0038] In actual surgical procedures, when the support catheter extends from the distal end of the guide sheath and moves towards the thrombus location, the filling component 2 has not yet filled the groove 102. At this time, the adjusting section 101, thanks to the groove 102 of the lumen layer 105, exhibits extremely high flexibility, thus facilitating a smooth and easy arrival at the thrombus location. When it is necessary to deliver the thrombectomy stent, the doctor only needs to gently manipulate the guide wire to drive the reinforcing structure to rotate into the groove 102, and the adjusting section 101 immediately gains strong support, ensuring that the thrombectomy stent can be delivered stably and accurately into place.

[0039] Example 2

[0040] like Figure 3 As shown, in this embodiment, almost all the structures of the supporting conduit are the same as in Embodiment 1. The only difference is that the cross-section of the reinforcing structure is H-shaped, and the filling component 2 is partially engaged with the groove 102. In this way, when filling the reinforcing structure, it can be ensured that the reinforcing structure does not detach from the groove 102, and that the reinforcing structure enters the groove 102 smoothly.

[0041] Example 3

[0042] like Figure 4As shown, in the embodiment, almost all structures of the support catheter are the same as those of the embodiment 1, and the only difference is that the cross section of the reinforcing structure is triangular, and the shape of the cross section of the groove 102 is triangular. Moreover, the cross section of the reinforcing structure is isosceles triangular, and the base of the isosceles triangle faces the inner side. In this way, the special cooperation between the groove 102 and the reinforcing structure can reduce the possibility of the reinforcing structure being separated from the groove 102, ensure the stable cooperation between the groove 102 and the reinforcing structure, and when the reinforcing structure is completely filled into the groove 102, the inner side is relatively flat, and the probability of interference with the stent is reduced.

[0043] It can be understood that the above description is only exemplary, and the embodiments of the present application are not limited thereto.

[0044] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is within the protection scope of the pending claims of the present application.

Claims

1. A support catheter comprising a tube (1), characterized in that, The pipe body (1) is provided with an adjusting section (101) at the distal end, which is used to extend from the distal end of the sheath pipe to the thrombus position, and a helically extending groove (102) is formed on the inner side wall of the adjusting section (101), and a filling part (2) is arranged in the lumen of the pipe body (1) at the proximal end of the adjusting section (101), which can be filled into the groove (102) to increase the support of the adjusting section (101).

2. The support catheter of claim 1, wherein, The pipe body (1) comprises, from outside to inside, a protective layer (103), a reinforcing layer (104) and a lumen layer (105) arranged in sequence, the lumen layer (105) has soft elasticity, and the groove (102) is arranged on the lumen layer (105).

3. The support catheter of claim 2, wherein, The filling part (2) is a helical reinforcing structure, which has a plurality of continuous annular helical wires, and the proximal end of the reinforcing structure is provided with a driving structure (3) for driving the reinforcing structure to rotate into the groove (102).

4. The support catheter of claim 3, wherein, The driving structure (3) is a guide wire which extends to the proximal end along the lumen of the pipe body (1).

5. The support catheter of claim 3, wherein, Before the reinforcing structure is filled, at least one annular helical wire at the distal end of the reinforcing structure is located at the proximal end of the groove (102).

6. The support catheter of claim 1, wherein, The pipe body (1) is provided with a developing part (4) at the distal end.

7. The support catheter of any of claims 3-5, wherein, The cross section of the reinforcing structure is circular, and the cross section of the groove (102) is semicircular.

8. The support catheter of any of claims 3-5, wherein, The cross section of the reinforcing structure is H-shaped, and the filling part (2) is partially clamped in the groove (102) and is in sliding fit with the groove (102).

9. The support catheter of any of claims 3-5, wherein, The cross section of the reinforcing structure is triangular, and the cross section of the groove (102) is triangular.

10. The support catheter of claim 9, wherein, The cross section of the reinforcing structure is isosceles triangle, and the base of the isosceles triangle faces the inner side.

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