Rapid exchange type micro catheter and conveying system of intravascular treatment instrument

Abstract

The utility model relates to the technical field of medical instruments, and discloses a rapid exchange type micro catheter and a conveying system of an intravascular treatment instrument. The rapid exchange type micro catheter comprises a catheter body, a sheath and a catheter seat. The catheter body comprises an inner-layer catheter, a middle-layer catheter and an outer-layer catheter, the catheter body is provided with a side hole, and the side hole penetrates from the outer-layer catheter to the inner-layer catheter and is communicated with an inner cavity of the catheter body; the distance between the side hole and the catheter far end is approximately 1 / 3 of the length of the catheter body. According to the utility model, the micro guide wire penetrates through the side hole, so that quick exchange of the micro guide pipe is facilitated, the treatment operation time in an intracranial arterial blood vessel is shortened, the surgical operation is simplified, and the surgical safety is improved; the size of the side hole is matched with the micro guide wire, so that a large amount of blood inside and outside the catheter is prevented from being exchanged, and the pushing and withdrawing performance of the micro guide wire is not affected. The distance between the side hole and the far end of the catheter is approximately 1 / 3 of the length of the catheter body, the length of the micro guide wire in the catheter can be reduced, and other instruments can be conveniently conveyed in the catheter at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a delivery system of a rapid exchange microcatheter and an intravascular therapeutic equipment. Background Art

[0002] Intracranial atherosclerotic stenosis (ICAS) is a common cause of ischemic stroke. Stroke patients with ICAS have more severe symptoms and worse prognosis. The stroke recurrence rate increases with the degree of vascular stenosis. In China, the incidence of ICAS in stroke / TIA patients is as high as 46.6%.

[0003] Treatments for ICAS include medical treatment, surgical treatment, and endovascular treatment. Surgical treatment has not been recommended by global guidelines to date due to its high incidence of complications. Current evidence still supports medical treatment as the first-line treatment for ICAS. However, for high-risk ICAS patients who cannot be controlled by medical treatment, endovascular therapy (EVT) is currently a safe and feasible treatment option.

[0004] EVT includes mechanical thrombectomy, balloon dilatation and stent implantation. Currently, for intracranial arterial lesions, many patients need to undergo two or more surgical procedures at the same time to achieve good treatment effects. Therefore, frequent device exchanges are required during the operation. After the access is established, some devices such as thrombectomy stents, balloon dilatation catheters, balloon-expandable stents, self-expanding stents, etc. need to be delivered by microcatheters (no microguidewires are required), while others need to be delivered by microguidewires (no microcatheters are required). In this way, coaxial exchange technology is required to replace the treatment device. This operation has high requirements on the operator's skills and the cooperation of the assistant, and has a low tolerance for error. Once a mistake is made, the vascular access needs to be re-established, which invisibly prolongs the operation time and increases the difficulty and risk of the operation. Utility Model Content

[0005] In view of this, the utility model provides a rapid exchange microcatheter and intravascular treatment device delivery system to solve the problem of high difficulty and high risk in the coaxial exchange surgery of microcatheter and microguidewire.

[0006] On the one hand, the utility model provides a rapid exchange microcatheter, comprising a catheter seat and a catheter body. The catheter body is connected to the catheter seat, and the catheter body comprises an inner layer catheter, an intermediate layer catheter and an outer layer catheter. The catheter body is provided with a side hole, which runs from the outer layer catheter to the inner layer catheter and is connected to the inner cavity of the catheter body; the distance between the side hole and the distal end of the catheter is approximately 1 / 3 of the length of the catheter body, and the size of the side hole is adapted to the size of the micro guidewire.

[0007] Beneficial effects: The rapid exchange microcatheter provided by the utility model is provided with a side hole on the catheter body, and the side hole is penetrated from the outer layer catheter to the inner layer catheter. In this way, the side hole can connect the outside of the catheter body with the inner cavity of the catheter body, and the side hole can be passed through by the micro-guidewire, which can facilitate the rapid exchange of the micro-catheter, shorten the operation time of intracranial arterial endovascular treatment, simplify the surgical operation, and improve the safety of the operation. At the same time, because the size of the side hole is adapted to the micro-guidewire, it can prevent a large amount of blood exchange inside and outside the catheter, and at the same time does not affect the pushing and retracting performance of the micro-guidewire. In addition, the side hole is arranged close to the distal end of the catheter, and the distance from the distal end of the catheter is approximately 1 / 3 of the length of the catheter body. In this way, the length of the micro-guidewire in the catheter can be reduced as much as possible on the basis of being sufficient, so as to facilitate the simultaneous delivery of other instruments in the catheter. The utility model is easy to operate, and helps neurointerventional doctors to more calmly implement complex intracranial endovascular treatments by exchanging quick micro-catheters, thereby achieving the purpose of shortening the operation time and reducing the risk of surgery.

[0008] In an optional embodiment, the inner diameter of the side hole is 0.5±0.1 mm.

[0009] In an optional embodiment, the hole wall of the side hole is inclined with respect to the axis of the catheter body.

[0010] In an optional embodiment, there is a first angle between the side wall of the side hole and the axis of the catheter body, and the first angle is 20° to 40°.

[0011] In an optional embodiment, the outer tube includes a first tube segment, a transition tube segment and a second tube segment in sequence from the distal end to the proximal end, and the hardness of the first tube segment, the transition tube segment and the second tube segment increases gradually.

[0012] In an optional embodiment, the middle layer conduit is a braided structure made of metal material.

[0013] In an optional embodiment, the inner conduit is made of polytetrafluoroethylene; and / or the outer conduit is made of a polymer material.

[0014] In an optional embodiment, a developing ring is provided at the distal end of the catheter body, and the developing ring is provided between the middle layer catheter and the outer layer catheter.

[0015] In an optional embodiment, a sheath is further included, and the sheath is connected between the catheter seat and the catheter body.

[0016] On the other hand, the utility model also provides a delivery system for an intravascular treatment device, comprising a rapid exchange microcatheter according to any one of the above technical solutions, and a microguidewire, wherein the size of the microguidewire is adapted to the size of the rapid exchange microcatheter.

[0017] Beneficial effects: Because the delivery system of the intravascular treatment device includes a rapid exchange microcatheter, it has the same effects as the rapid exchange microcatheter and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a front view of a rapid exchange microcatheter according to an embodiment of the utility model;

[0020] Figure 2 for Figure 1 A cross-sectional view of the rapid exchange microcatheter along its axial direction is shown;

[0021] Figure 3 for Figure 1 A cross-sectional view of the rapid exchange microcatheter along its radial direction is shown;

[0022] Figure 4 for Figure 1 The schematic diagram of the structure of the rapid exchange microcatheter and the guide wire;

[0023] Figure 5 Schematic diagram of the side hole inclination angle structure.

[0024] Description of reference numerals:

[0025] 1. Catheter seat; 2. Sheath; 3. Catheter body; 301. Inner catheter; 302. Intermediate catheter; 303. Outer catheter; 310. Side hole; 304. First tube section; 305. Transition tube section; 306. Second tube section; 4. Development ring; 10. Rapid exchange microcatheter; 20. Micro guidewire. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0027] EVT includes mechanical thrombectomy, balloon dilatation and stent placement. At present, for intravascular operations of intracranial arterial lesions, it is usually necessary to use a 7-9F guiding catheter (long sheath) + a 5-6F distal access catheter (intermediate catheter) + a microcatheter with an inner diameter of 0.017-0.021in + a microguidewire of 0.014in to establish a pathway to the lesion site, and then send in the treatment device to perform thrombectomy, balloon dilatation, stent placement and other operations. However, many patients' conditions require more than two surgical procedures at the same time to achieve a good treatment effect, so frequent device exchanges are required during the operation. After the pathway is established, some devices such as thrombectomy stents, balloon dilatation catheters, balloon expansion stents, self-expanding stents, etc. need to be delivered by microcatheters (no microguidewires are required), while others need to be delivered by microguidewires (no microcatheters are required). In this way, coaxial exchange technology is required to replace the treatment device. This operation has high requirements for the operator's skills and the cooperation of the assistant, and the tolerance rate is low. Once a mistake is made, the vascular access needs to be re-established, which invisibly prolongs the operation time and increases the difficulty and risk of the operation.

[0028] Therefore, there is an urgent need for a microcatheter that is easy to operate and quickly exchanged to help neurointerventional physicians more easily perform complex intracranial endovascular treatments, thereby shortening the operation time and reducing the surgical risk.

[0029] The utility model provides a rapid exchange type microcatheter, which can enter the target blood vessel or be withdrawn from the body more quickly, thus simplifying the surgical operation.

[0030] Combine the following Figures 1 to 5 , describing an embodiment of the utility model.

[0031] According to an embodiment of the utility model, on the one hand, a rapid exchange microcatheter 10 is provided, comprising a catheter body 3, a sheath 2 and a catheter seat 1. The catheter body 3 comprises an inner layer catheter 301, an intermediate layer catheter 302 and an outer layer catheter 303, and the catheter body 3 is provided with a side hole 310, which passes through the outer layer catheter 303 to the inner layer catheter 301 and is connected to the inner cavity of the catheter body 3; the distance between the side hole 310 and the distal end of the catheter is approximately 1 / 3 of the length of the catheter body 3, and the size of the side hole 310 is adapted to the size of the micro guidewire 20.

[0032] The rapid exchange type microcatheter 10 provided by the embodiment of the utility model is provided with a side hole 310 on the catheter body 3, and the side hole 310 is penetrated from the outer layer catheter 303 to the inner layer catheter 301, so that the side hole 310 can connect the outside of the catheter body 3 with the inner cavity of the catheter body 3, and the side hole 310 can be passed through by the micro guide wire 20, which can facilitate the rapid exchange of the microcatheter, shorten the operation time of intracranial artery intravascular treatment, simplify the surgical operation, and improve the safety of the operation. At the same time, since the size of the side hole 310 is adapted to the micro guide wire 20, it can prevent a large amount of blood from being exchanged inside and outside the rapid exchange type microcatheter 10, and at the same time does not affect the pushing and retracting performance of the micro guide wire 20. In addition, the side hole 310 is arranged close to the distal end of the catheter, and the distance from the distal end of the catheter is approximately 1 / 3 of the length of the catheter body 3. In this way, the length of the micro guide wire 20 in the rapid exchange type microcatheter 10 can be reduced as much as possible on the basis of being sufficient, so as to facilitate the simultaneous delivery of other instruments in the rapid exchange type microcatheter 10. The utility model is easy to operate and helps neurointerventional doctors to more calmly implement complex intracranial endovascular treatments by exchanging quick microcatheters, thereby achieving the purpose of shortening the operation time and reducing the operation risk.

[0033] Specifically, the end of the rapid exchange microcatheter 10 close to the operator is the proximal end, and correspondingly, the end of the rapid exchange microcatheter 10 away from the operator is the distal end.

[0034] In some embodiments, the inner diameter of the side hole 310 is 0.5±0.1 mm.

[0035] The inner diameter of the side hole 310 is controlled at 0.5±0.1 mm, which is suitable for the passage of the commonly used micro-guidewire 20. After the micro-guidewire 20 passes through the side hole 310, the micro-guidewire 20 fits tightly with the side hole 310, which can prevent a large amount of blood exchange between the inside and outside of the rapid exchange micro-catheter 10, and does not affect the pushing and retracting performance of the micro-guidewire 20.

[0036] In some embodiments, the hole wall of the side hole 310 is inclined relative to the axis of the catheter body 3 .

[0037] Since the microguidewire 20 is inserted into the inner cavity of the catheter body 3 from the side hole 310, the microguidewire 20 has an inclined section. That is, after the microguidewire 20 is obliquely inserted into the side hole 310, it is bent and parallel to the axis of the catheter body 3, and the vertical opening on the catheter body 3 will cause the microguidewire 20 to have a large bending angle, and the resistance of the microguidewire 20 entering the catheter body 3 and being transported is large. In this embodiment, the side wall of the side hole 310 is set to be inclined with respect to the axial direction of the catheter body 3, which can guide the insertion of the microguidewire 20, reduce the insertion angle of the microguidewire 20, thereby reducing the bending angle of the microguidewire 20, and make the insertion and transportation of the microguidewire 20 smoother. At the same time, the side wall of the side hole 310 is set to be inclined, which can also improve the fit between the side hole 310 and the microguidewire 20, further prevent a large amount of blood exchange inside and outside the rapid exchange microcatheter 10, and at the same time do not affect the push and withdraw performance of the microguidewire 20.

[0038] In some embodiments, Figure 5 As shown, there is a first angle α between the side wall of the side hole 310 and the axis of the catheter body 3, and the first angle α is 20° to 40°.

[0039] Specifically, the first angle α is controlled within the range of 20° to 40°. On the one hand, the inclined side wall can guide the insertion of the micro-guidewire 20. On the other hand, the micro-guidewire 20 can be more closely fitted with the side hole 310 after being inserted into the side hole 310. Specifically, in one embodiment, the first angle α is 30°.

[0040] In some embodiments, the outer tube 303 includes a first tube segment 304, a transition tube segment 305 and a second tube segment 306 from the distal end to the proximal end, and the hardness of the first tube segment 304, the transition tube segment 305 and the second tube segment 306 increases gradually.

[0041] By setting the outer tube 303 to a first tube segment 304, a transition tube segment 305 and a second tube segment 306 with different hardnesses, the first tube segment 304 near the distal end has a lower hardness and better flexibility, thereby enhancing the ability of the rapid exchange microcatheter 10 to conform to the shape of the blood vessel, thereby improving the pushability of the rapid exchange microcatheter 10, and the second tube segment 306 near the proximal end has a higher hardness and better support, thereby enhancing the operability of the rapid exchange microcatheter 10.

[0042] In some embodiments, the middle layer conduit 302 is a braided structure made of metal material.

[0043] The intermediate layer catheter 302 adopts a braided structure, which is beneficial to strengthening the strength of the catheter body 3. The intermediate layer catheter 302 is made of metal material, which can strengthen the catheter body 3, so that the catheter body 3 has good supporting performance and pushing performance, so that it can pass through the narrow and slender section of the intracranial blood vessels.

[0044] In some embodiments, the inner tube 301 is made of polytetrafluoroethylene.

[0045] In some embodiments, the outer tube 303 is made of polymer material.

[0046] In some embodiments, a developing ring 4 is provided at the distal end of the catheter body 3 , and the developing ring 4 is provided between the middle layer catheter 302 and the outer layer catheter 303 .

[0047] Specifically, the developing ring 4 is made of a platinum-iridium alloy.

[0048] In some embodiments, a sheath 2 is further included, and the sheath 2 is connected between the catheter hub 1 and the catheter body 3 .

[0049] By providing the sheath 2 , the catheter body 3 and the catheter seat 1 are transitionally connected, thereby improving the stability of the operation control of the catheter body 3 by the catheter seat 1 .

[0050] According to an embodiment of the present invention, on the other hand, a delivery system for an intravascular treatment device is provided, comprising a rapid exchange microcatheter 10 of any one of the above technical solutions, and a microguidewire 20. The size of the microguidewire 20 is adapted to the size of the side hole 310 of the rapid exchange microcatheter 10.

[0051] Since the delivery system of the intravascular treatment device includes the rapid exchange type microcatheter 10 in the above embodiment, the microguidewire 20 is inserted into the catheter body 3 through the side hole 310 on the catheter body 3, which can facilitate the rapid exchange of the microcatheter, shorten the operation time of intracranial artery intravascular treatment, simplify the surgical operation, and improve the safety of the operation. At the same time, after the microguidewire 20 is inserted into the side hole 310, the microguidewire 20 and the hole wall of the side hole 310 are adapted and tightly fitted, and the side hole 310 is blocked, which can prevent a large amount of blood exchange inside and outside the rapid exchange type microcatheter 10, and does not affect the pushing and retracting performance of the microguidewire 20. In addition, the side hole 310 is set close to the distal end of the catheter, and the distance from the distal end of the catheter is approximately 1 / 3 of the length of the catheter body 3. In this way, the length of the microguidewire 20 in the rapid exchange type microcatheter 10 can be reduced as much as possible on the basis of being sufficient, so as to facilitate the simultaneous delivery of other instruments in the rapid exchange type microcatheter 10. The utility model can help neurointerventional doctors to more calmly implement complex intracranial endovascular treatments, thereby achieving the purpose of shortening the operation time and reducing the operation risk.

[0052] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A rapid exchange microcatheter, characterized in that: include: A catheter seat (1); A catheter body (3) is connected to the catheter seat (1), the catheter body (3) comprises an inner layer catheter (301), an intermediate layer catheter (302) and an outer layer catheter (303), the catheter body (3) is provided with a side hole (310), the side hole (310) passes through the outer layer catheter (303) to the inner layer catheter (301), and is connected to the inner cavity of the catheter body (3); the distance between the side hole (310) and the distal end of the rapid exchange microcatheter is approximately 1 / 3 of the length of the catheter body (3), and the size of the side hole (310) is adapted to the micro guidewire (20).

2. The rapid exchange microcatheter according to claim 1, characterized in that: The inner diameter of the side hole (310) is 0.5±0.1 mm.

3. The rapid exchange microcatheter according to claim 1 or 2, characterized in that: The hole wall of the side hole (310) is arranged obliquely with respect to the axis of the catheter body (3).

4. The rapid exchange microcatheter according to claim 3, characterized in that: There is a first angle between the side wall of the side hole (310) and the axis of the catheter body (3), and the first angle is 20° to 40°.

5. The rapid exchange microcatheter according to claim 1 or 2, characterized in that: The outer tube (303) includes a first tube section (304), a transition tube section (305) and a second tube section (306) from the distal end to the proximal end, and the hardness of the first tube section (304), the transition tube section (305) and the second tube section (306) increases gradually.

6. The rapid exchange microcatheter according to claim 1 or 2, characterized in that: The intermediate layer conduit (302) is a braided structure made of metal material.

7. The rapid exchange microcatheter according to claim 1 or 2, characterized in that: The inner layer conduit (301) is made of polytetrafluoroethylene; and / or the outer layer conduit (303) is made of a polymer material.

8. The rapid exchange microcatheter according to claim 1 or 2, characterized in that: A developing ring (4) is provided at the distal end of the catheter body (3), and the developing ring (4) is provided between the intermediate layer catheter (302) and the outer layer catheter (303).

9. The rapid exchange microcatheter according to claim 1 or 2, characterized in that: It also comprises a sheath (2), wherein the sheath (2) is connected between the catheter seat (1) and the catheter body (3).

10. A delivery system for an intravascular treatment device, characterized in that: include: The rapid exchange microcatheter according to any one of claims 1 to 9; A micro guide wire (20), the size of which is adapted to the size of the side hole (310) of the rapid exchange micro catheter.

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