Sheath-free micro-catheter intervention set for upper limb approach

Abstract

The invention relates to the technical field of catheter intervention, in particular to a sheath-free micro catheter intervention set for upper limb approach. The catheter comprises a middle catheter body, a micro catheter body and a treatment guide wire, the end of the middle catheter body is communicated with a catheter connector, the end of the micro catheter body is communicated with a micro connector, the outer wall, close to the micro connector, of the catheter connector is sleeved with an outer limiting stopper, and the outer wall, close to the front end, of the micro connector is sleeved with an inner limiting stopper; a stabilizing piece is rotationally arranged on the outer wall of the micro connector, and the stabilizing piece forms a V-shaped supporting state to dynamically assist the micro catheter, the middle catheter and the treatment guide wire in stabilizing. On one hand, the coaxial locking effect of the stabilizing part is achieved, on the other hand, the dynamic supporting effect of the stabilizing part in different stages is achieved, one side of the stabilizing part limits series connection of the micro connector and the catheter connector and independently supports and fixes the micro catheter, one side of the stabilizing part limits shaking of the treatment guide wire, and the other side of the stabilizing part is supported on the supporting face to be kept stable.

Description

Technical Field

[0001] The present invention relates to the technical field of catheter interventional techniques, and more particularly, to a sheathless microcatheter interventional set for upper limb access. Background Art

[0002] In the field of endovascular interventional therapy (such as neurointervention, peripheral angioplasty), microcatheter systems are widely used in scenarios such as wire guidance, drug delivery, and mechanical thrombectomy. Traditional operations usually rely on: a guiding catheter or a long sheath to provide support to ensure that the microcatheter and the guide wire can reach the target lesion smoothly. To reduce vascular trauma, the "sheathless microcatheter technique" has been proposed in recent years. Its core is to omit the traditional sheath and directly complete the operation through the synergistic effect of the microcatheter and the intermediate catheter. In the prior art, the upper limb blood vessel is punctured with a puncture needle, a path guide wire is inserted to form a catheter path, and then the intermediate tube is inserted into the upper limb blood vessel along the catheter path to support the catheter path. Next, in the stage where the microcatheter is inserted into the intermediate tube, the path guide wire is then withdrawn, and the treatment guide wire is inserted into the upper limb blood vessel through the microcatheter to reach the treatment position for treatment operations (such as thrombectomy, drug delivery, etc.);

[0003] However, currently, the intermediate tube, the microcatheter, and the guide wire are relatively independent of each other, and the following problems are likely to occur:

[0004] Firstly, in sheathless operation, there may be a small gap between the microcatheter and the intermediate tube. When the guide wire is first inserted, the distal end of the microcatheter is likely to swing or even deviate from the target path due to blood vessel bending or respiratory movement. Moreover, due to the tortuosity or spasm of the upper limb blood vessels (such as the radial artery and the brachial artery), if the microcatheter and the intermediate tube do not restrict each other, "tube retraction" may occur when the guide wire is pushed.

[0005] Secondly, whether the microcatheter is inserted into the intermediate tube or the guide wire is inserted into the microcatheter, it is necessary to manually maintain the coaxiality of the catheter, and there is a lack of a standardized fixing method, relying on experience and auxiliary instruments (such as temporary fixation with a hemostatic forceps). The operation burden on the operator is increased. In view of this, we propose a sheathless microcatheter interventional set for upper limb access. Summary of the Invention

[0006] The purpose of the present invention is to provide a sheathless microcatheter interventional set for upper limb access to solve the problems of support and fixation + the lack of mutual assistance between the intermediate tube, the microcatheter, and the guide wire, resulting in mutual influence on stability as proposed in the above background art.

[0007] To achieve the above object, the present invention provides a sheathless microcatheter interventional set for upper limb access, including an intermediate catheter inserted into the upper limb blood vessel catheter path formed by a path guide wire, a microcatheter inserted into the intermediate catheter, and a treatment guide wire inserted into the microcatheter. The characteristics are as follows: a catheter joint is connected to the end of the intermediate catheter, and a micro joint is connected to the end of the microcatheter, where:

[0008] An outer stopper is sleeved on the outer wall of the catheter joint near the micro-joint, and an inner stopper is sleeved on the outer wall of the micro-joint near the front end;

[0009] A stabilizing member is rotatably arranged on the outer wall of the micro-joint. The stabilizing member forms a "V"-shaped support state to dynamically assist in stabilizing the micro-catheter, the intermediate catheter, and the treatment guide wire. By inwardly rotating the stabilizing member, it is elastically restricted within the outer stopper, and the micro-joint and the catheter joint are connected in series. By outwardly rotating the stabilizing member, it is elastically restricted within the inner stopper, forming a limiting area for guiding and positioning the treatment guide wire.

[0010] On the above basis, the specific structure is further defined in detail:

[0011] One of its purposes is that: the stabilizing member at least includes a rear leg and a front leg. The rear leg is integrally formed and connected to the end of the front leg, and the rear leg and the front leg are combined to form a "V" shape;

[0012] The stabilizing member further includes a plurality of rotating frames fixed on the outer wall of the micro-joint. The connection part of the rear leg and the front leg is rotatably arranged inside the rotating frame.

[0013] As a further improvement of this technical solution, the outer edges of the outer walls of the rear leg and the front leg both adopt an arc structure, and a rubber pad is wrapped. The rubber pad is used to increase the frictional resistance of the rear leg and the front leg to hold, and make it more comfortable and stable when the ends of the rear leg and the front leg abut against the supporting surface.

[0014] As a further improvement of this technical solution, the outer stopper at least includes an outer rubber ring fixedly sleeved on the outer wall of the front end of the catheter joint. The outer rubber ring is made of elastic rubber material, and a plurality of rear card slots are formed on the outer wall of the outer rubber ring. The rear card slots are elastically clamped and adapted to the size of the rear leg.

[0015] As a further improvement of this technical solution, the inner stopper at least includes an inner rubber ring fixed on the outer wall of the front end of the micro-joint. A plurality of front card slots are formed on the outer wall of the inner rubber ring. The front card slots are elastically clamped and adapted to the size of the front leg;

[0016] The outer wall of the inner rubber ring is inclined and formed from the inside to the outside, and adapts to the rotation and inclination angle of the front leg.

[0017] Furthermore, the micro-joint and the catheter joint are in interference fit. When the micro-joint with interference fit is inserted into the catheter joint, it generates a radial elastic deformation to form a uniform contact pressure.

[0018] Another of its purposes is that: both the front card slot and the rear card slot adopt an inner profile that is a groove, and the groove expands from the outside to the inside in sequence to elastically clamp the front leg and the rear leg;

[0019] The number of the rear card slots is greater than the number of the rear legs, and the number of the front card slots is greater than the number of the front legs.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. In the sheathless microcatheter intervention set for upper limb access, the coaxial locking effect of the stabilizing member is achieved as follows:

[0022] The stabilizing member is restricted and fixed by the outer limiter when rotating inwards, so that the micro-joint and the catheter joint are coaxially locked. To avoid the situation that during the initial stage when the treatment guide wire extends into the microcatheter from the micro-joint, the treatment guide wire initially extends into the interior of the microcatheter and abuts against the inner wall of the microcatheter, resulting in the pushing force carrying the microcatheter to move together, causing the microcatheter to retreat from the target area. Therefore, through the locking of the micro-joint and the catheter joint, even if the microcatheter is subjected to a pushing force, it will be blocked by the supporting force of the intermediate catheter, reducing the possibility of retreat.

[0023] The stabilizing member is restricted and fixed by the inner limiter when rotating outwards, so that the stabilizing member forms a limiting area for accommodating the treatment guide wire, and the limiting area is on the same center line as the micro-joint. This not only facilitates the treatment guide wire to extend into the interior of the microcatheter more accurately from the limiting area, but also as the treatment guide wire extends deeper, the front-end treatment guide wire is always restricted and guided, improving the stability of the intervention. Moreover, it prevents the treatment guide wire from drifting with the blood flow and enhances the thrombus chimerism efficiency.

[0024] 2. In the sheathless microcatheter intervention set for upper limb access, the function of dynamic support of the stabilizing member in different stages is achieved as follows:

[0025] When the microcatheter extends into the intermediate catheter and the micro-joint approaches the catheter joint, it is necessary to pull out the path guide wire or insert the treatment guide wire. By restricting the series connection of the micro-joint and the catheter joint on one side of the stabilizing member and abutting against the supporting surface on the other side, it is equivalent to maintaining the synchronous support stability of the micro-joint and the catheter joint, avoiding the situation that the operator needs to fix the intermediate catheter and the microcatheter with one hand and push the treatment guide wire with the other hand, resulting in distraction during the operation and causing displacement.

[0026] When the microcatheter penetrates into the intermediate catheter to a certain position and needs to pause, it is supported on the supporting surface in a "V" - shaped support formed by the stabilizing member, and the microcatheter is supported and fixed separately. Moreover, the stabilizing member can be rotated and adjusted according to the curvature of the supporting surface until the microcatheter can be paused and supported more stably at a certain position, facilitating other operations of medical staff more conveniently.

[0027] When the treatment guide wire reaches the target area and treatment operations are carried out, one side of the stabilizing member restricts the shaking of the treatment guide wire, and the other side supports on the supporting surface to maintain stability, avoiding the shaking of the treatment guide wire during treatment operations and reducing operation - related complications. Description of the Drawings

[0028] Figure 1 is the overall structure schematic diagram of the present invention;

[0029] Figure 2 is the schematic diagram of the overall structure of the present invention assembled on the upper limb blood vessel;

[0030] Figure 3 is the sectional view of the overall structure of the present invention;

[0031] Figure 4 is the sectional view of the support state of the auxiliary micro-joint of the stabilizing member of the present invention;

[0032] Figure 5 is the schematic diagram of the cooperation between the catheter joint and the micro-joint of the present invention;

[0033] Figure 6 is the support demonstration diagram when the catheter joint and the micro-joint of the present invention are cooperating;

[0034] Figure 7 is the schematic diagram of the cooperation between the stabilizing member and the guide wire of the present invention;

[0035] Figure 8 is the support demonstration diagram when the stabilizing member and the guide wire of the present invention are cooperating;

[0036] Figure 9 is the sectional view of the outer limiter of the present invention.

[0037] The meanings of each label in the figure are as follows:

[0038] 100, catheter joint; 110, intermediate catheter; 200, micro-joint; 210, micro-catheter; 300, treatment guide wire;

[0039] 400, stabilizing member; 410, rotating frame; 420, rear leg; 430, front leg;

[0040] 500, outer limiter; 510, outer rubber ring; 520, rear card slot; 600, inner limiter; 610, inner rubber ring; 620, front card slot. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment 1

[0043] Please refer to Figures 1-8As shown in the figure, this embodiment provides a sheathless microcatheter intervention set for upper limb access, including an intermediate catheter 110 extending into the internal part of the upper limb blood vessel catheter path formed by a guide wire. A microcatheter 210 is inserted into the intermediate catheter 110, and a treatment guide wire 300 is inserted into the microcatheter 210. When performing microcatheter intervention through the upper limb access, first, a 21G - 22G micro - puncture needle is used to puncture the radial artery / brachial artery, greatly reducing the risk of blood vessel injury. A hydrophilic guide wire with a diameter of 0.014 - 0.018 inches (0.18mm - 0.46mm) is inserted as the guide wire to establish an initial channel, that is, the catheter path. The intermediate catheter 110 (outer diameter: "2.3mm - 2.8mm", inner diameter: "1.78mm - 2.24mm") is directly fed along the guide wire. The intermediate catheter 110 provides sufficient rigidity and coaxiality to support the subsequent microcatheter 210 (outer diameter: "0.56mm - 0.93mm", inner diameter: "0.43mm - 0.69mm") to enter the deep blood vessels. Then, the microcatheter 210 is inserted into the intermediate catheter 110 and reaches the target area. After confirming that the microcatheter 210 is in place, the guide wire is removed, and the treatment guide wire 300 is prepared to enter. According to the treatment requirements, the corresponding treatment guide wire 300 is selected, such as a thrombectomy stent guide wire, a balloon guide wire, etc. The treatment guide wire 300 extends through the microcatheter 210 to the lesion site such as a thrombus or stenosis to complete mechanical thrombectomy or angioplasty. On this basis, the improvement of the present invention lies in: specifically as Figures 1-3 As shown in the figure, a catheter joint 100 is connected to the end of the intermediate catheter 110, and a micro - joint 200 is connected to the end of the microcatheter 210, where:

[0044] An outer limiter 500 is sleeved on the outer wall of the catheter joint 100 close to the micro - joint 200, and an inner limiter 600 is sleeved on the outer wall of the micro - joint 200 close to the front end;

[0045] A stabilizing member 400 is rotatably arranged on the outer wall of the micro - joint 200. The stabilizing member 400 forms a "V" - shaped support state to dynamically assist the stability of the microcatheter 210, the intermediate catheter 110, and the treatment guide wire 300. The automatic locking function of the stabilizing member 400 liberates the hands of the operator, shortens the operation time, reduces the mechanical stimulation of the blood vessel intima by suppressing the unnecessary movement of the catheter / guide wire system, such as the "bouncing" of the microcatheter tip. The stabilizing member 400 is elastically restricted within the outer limiter 500 by inward rotation, and the micro - joint 200 and the catheter joint 100 are connected in series. The stabilizing member 400 is elastically restricted within the inner limiter 600 by outward rotation, forming a limiting area for guiding and positioning the treatment guide wire 300.

[0046] Based on the above structure, in the present invention, considering that there may be a small gap between the microcatheter and the intermediate tube during sheathless operation, when the guide wire first extends in, the tip of the microcatheter is likely to swing due to blood vessel bending or respiratory movement, or due to tortuosity or spasm in upper limb blood vessels such as the radial artery and brachial artery, and there is no mutual restriction between the microcatheter and the intermediate tube, "tube retraction" may occur when pushing the guide wire. Therefore, on the one hand, the coaxial locking effect of the fixing member 400 is achieved, specifically as follows:

[0047] As Figure 5 shown, by the inward rotation of the fixing member 400 being restricted and fixed by the outer limiter 500, the micro-joint 200 and the catheter joint 100 are coaxially locked, avoiding that in the initial stage when the treatment guide wire 300 extends from the micro-joint 200 into the microcatheter 210, the treatment guide wire 300 initially extends into the interior of the microcatheter 210 and abuts against the inner wall of the microcatheter 210, causing the pushing force to carry the microcatheter 210 to move together, resulting in the microcatheter 210 retracting from the target area. Therefore, through the locking of the micro-joint 200 and the catheter joint 100, even if the microcatheter 210 is subjected to a pushing force, it will be blocked by the supporting force of the intermediate catheter 110, reducing the possibility of retraction;

[0048] As Figure 7 shown, by the outward rotation of the fixing member 400 being restricted and fixed by the inner limiter 600, the fixing member 400 forms a limiting area for accommodating the treatment guide wire 300, and the limiting area is on the same center line as the micro-joint 200. This not only facilitates the more accurate extension of the treatment guide wire 300 from the limiting area into the interior of the microcatheter 210. As the treatment guide wire 300 extends deeper, the front-end treatment guide wire 300 is always restricted and guided, improving the stability of the intervention. Moreover, it prevents the treatment guide wire 300 from drifting with the blood flow and enhances the thrombus chimerism efficiency;

[0049] Moreover, whether the microcatheter extends into the intermediate tube or the guide wire extends into the microcatheter, it is necessary to manually maintain the coaxiality of the catheter, and there is a lack of a standardized fixing method, relying on experience and auxiliary instruments such as hemostatic forceps for temporary fixation, increasing the operating burden on the operator. Therefore, on the other hand, the role of the fixing member 400 in dynamically supporting at different stages is achieved, specifically as follows:

[0050] As Figure 6 shown, when the microcatheter 210 extends into the interior of the intermediate catheter 110 and the micro-joint 200 approaches the catheter joint 100, it is necessary to withdraw the path guide wire or insert the treatment guide wire 300. By restricting the series connection of the micro-joint 200 and the catheter joint 100 on one side of the fixing member 400 and abutting against the supporting surface on the other side, it is equivalent to maintaining the synchronous support stability of the micro-joint 200 and the catheter joint 100, avoiding the operator having to fix the intermediate catheter 110 and the microcatheter 210 with one hand and push the treatment guide wire 300 with the other hand, resulting in distraction during the operation and causing displacement;

[0051] As Figure 4As shown, when the micro catheter 210 is inserted into the inner part of the intermediate catheter 110 to a certain position and needs to pause, it is supported in a "V" - shaped support by the stabilizer 400 on the support surface to separately support and fix the micro catheter 210. Moreover, the stabilizer 400 can be rotated and adjusted according to the curvature of the support surface until the micro catheter 210 can be more stably paused at a certain position, which is more convenient for other operations of medical staff;

[0052] As Figure 8 shown, when the treatment guide wire 300 reaches the target area for treatment operations, one side of the stabilizer 400 restricts the shaking of the treatment guide wire 300, and the other side is supported on the support surface to remain stable, avoiding the shaking of the treatment guide wire 300 during treatment operations and reducing operation - related complications.

[0053] And, further elaborate on the specific structure in detail:

[0054] First of all, to enable the stabilizer 400 to dynamically support and connect the catheter joint 100, the micro - joint 200, and restrict the shaking of the treatment guide wire 300, further disclose the specific structure of the stabilizer 400, so that the stabilizer 400 at least includes a rear leg 420 and a front leg 430. The rear leg 420 and the end of the front leg 430 are integrally formed and connected, and the rear leg 420 and the front leg 430 are combined to form a "V" shape;

[0055] The stabilizer 400 also includes a plurality of rotating frames 410 fixed on the outer wall of the micro - joint 200. The connection part of the rear leg 420 and the front leg 430 is rotatably arranged inside the rotating frame 410. By rotating the stabilizer 400, that is, the connection part of the rear leg 420 and the front leg 430 rotates and adjusts inside the rotating frame 410, so that the rear leg 420 and the front leg 430 can adapt to the inclination angle of the support surface during coordinated support, which is further beneficial to when the micro catheter 210 is released for other operations, the micro catheter 210 will not drop on the patient's skin support surface due to gravity, causing pressure sores and contamination;

[0056] Moreover, multiple groups of stabilizers 400 are provided. If the two support points on one stabilizer 400 (the two support points formed by the rear leg 420 and the front leg 430 respectively contacting the skin) are tilted to the left and right by external forces, they will immediately be further supported by the adjacent stabilizer 400, and the adjacent two stabilizers 400 will also assist each other to form four support points, which is more stable and convenient for medical staff to adjust the support stability according to their needs.

[0057] Specifically, the outer wall edges of the rear support leg 420 and the front support leg 430 both adopt an arc structure, and a rubber pad is wrapped around them. The rubber pad is used to increase the frictional resistance when the rear support leg 420 and the front support leg 430 are grasped, enabling medical staff to hold the rear support leg 420 and the front support leg 430. That is, by contacting the rubber pad, the micro catheter 210 can be driven to rotate to change the angle of insertion into the blood vessel, and when the ends of the rear support leg 420 and the front support leg 430 abut against the support surface, it is more comfortable and stable. The rubber pad is elastic, and if the support surface is the skin, it can contact the skin more comfortably. At the same time, the rubber pad has a certain roughness, which can improve the support and anti-slip effect.

[0058] Then, to achieve the inward rotation of the fixing member 400 and its locking by the outer limiter 500, and to realize the series connection of the micro joint 200 and the catheter joint 100, it is necessary to further disclose the structure of the outer limiter 500. The outer limiter 500 at least includes an outer rubber ring 510 fixedly sleeved on the front outer wall of the catheter joint 100. The outer rubber ring 510 is made of elastic rubber material, and a plurality of rear card slots 520 are formed on the outer wall of the outer rubber ring 510. The rear card slots 520 are elastically clamped and adapted to the size of the rear support leg 420. By rotating the fixing member 400, the rear support leg 420 is just aligned and inserted into the interior of the rear card slot 520, causing the rear card slot 520 to deform under the extrusion force to generate an elastic force, and the elastic force clamps and limits the rear support leg 420. Equivalently, the rear support leg 420 acts as a bridge for series connecting the micro joint 200 and the catheter joint 100, realizing the synchronous support and stability of the auxiliary micro joint 200 and the catheter joint 100.

[0059] Similarly, to achieve the outward rotation of the fixing member 400 to form a limiting area that can limit the shaking of the treatment guide wire 300, the inner limiter 600 is further disclosed. The inner limiter 600 at least includes an inner rubber ring 610 fixed on the front outer wall of the micro joint 200. A plurality of front card slots 620 are formed on the outer wall of the inner rubber ring 610. The front card slots 620 are elastically clamped and adapted to the size of the front support leg 430. By rotating the fixing member 400 outward, the front support leg 430 is driven to align with the front card slot 620 and be inserted into the slot, causing the front card slot 620 to deform under the extrusion force to generate an elastic force, and the elastic force squeezes and fixes the front support leg 430, so that the limiting area formed at the end of the front support leg 430 just clamps and limits the shaking of the treatment guide wire 300.

[0060] Among them, to ensure the structural integrity, the outer wall of the inner rubber ring 610 is formed to be inclined from the inside to the outside, and it adapts to the rotation and inclination angle of the front support leg 430. When the front support leg 430 rotates to form a limiting area, it will not cause extrusion to the inner rubber ring 610, but just fits against the outer wall of the inner rubber ring 610, avoiding the influence of extrusion on the service life of the inner rubber ring 610.

[0061] It should be noted that the micro-joint 200 is in interference fit with the catheter joint 100. When the micro-joint 200 with interference fit is inserted into the catheter joint 100, it generates radial elastic deformation to form a uniform contact pressure. And the inner diameter of the micro-joint 200 is slightly smaller than the outer diameter of the catheter joint 100, usually with a difference of 0.02 - 0.05 mm. When pushing the coil or aspirating thrombus, it can withstand an axial tensile force of >5 N, avoiding joint separation caused by blood flow impact or catheter torsional deformation, especially suitable for the thrombus removal scenario with high torque operation. Moreover, there are no steps or gaps at the interference fit connection, and the inner wall smoothness is close to that of the catheter body, which can reduce the risk of turbulence, reduce the probability of thrombus formation, avoid contrast agent retention, and improve image clarity;

[0062] The operator only needs to vertically press the micro-joint 200 into the catheter joint 100 without rotation and locking, and the locking operation of the two can also be achieved.

[0063] Embodiment 2:

[0064] As Figure 9 shown, to achieve the limiting strength of the front leg 430 inserted into the front card slot 620 and the limiting strength of the rear leg 420 inserted into the rear card slot 520, the difference between this embodiment and Embodiment 1 is that: both the front card slot 620 and the rear card slot 520 adopt an inner profile that is a groove, and the groove expands from the outside to the inside in sequence to elastically clamp the front leg 430 and the rear leg 420. When the front leg 430 and the rear leg 420 are respectively inserted into the front card slot 620 and the rear card slot 520, they can enter the inside of the groove from the narrow pores. When the front leg 430 and the rear leg 420 are completely located inside the front card slot 620 and the rear card slot 520, the narrow pores reduce the possibility of the front leg 430 and the rear leg 420 falling off and improve the elastic clamping strength.

[0065] Specifically, the number of rear card slots 520 is greater than the number of rear legs 420, and the number of front card slots 620 is greater than the number of front legs 430. This means that the rear card slots 520 and the front card slots 620 are set more densely, which is conducive to the probability that the rear leg 420 and the front leg 430 are respectively aligned with the rear card slots 520 and the front card slots 620 at any angle, and improves the necessity.

[0066] In summary, the overall working principle of the present invention is as follows:

[0067] S1. Puncture the radial artery / brachial artery of the upper limb through a micro-puncture needle, and then insert a hydrophilic guide wire as a path guide wire to establish an initial channel, that is, a catheter path;

[0068] S2. Directly send the intermediate catheter 110 along the path guide wire. The intermediate catheter 110 provides sufficient rigidity and coaxiality to support the subsequent micro-catheter 210 to enter the deep blood vessels;

[0069] S3. Insert the microcatheter 210 into the intermediate catheter 110. During this process, the "V"-shaped support formed by the rear leg 420 and the front leg 430 can be used for support and pause at any time, so that the microcatheter 210 that has not fully entered will not cause pressure sores or contamination due to the action of gravity and fall on the patient's skin support surface until the target area is reached, bringing the micro-connector 200 close to the catheter connector 100. By rotating the stabilizing member 400, the rear leg 420 is inserted into the inner part of the rear card slot 520, and the outer rubber ring 510 generates an elastic force that squeezes the inner part of the rear card slot 520 to limit the rear leg 420, locking the micro-connector 200 and the catheter connector 100 so that they can rotate and pull synchronously, and can also be stably supported through the front leg 430 synchronously;

[0070] S4. Remove the path guide wire and prepare for the treatment guide wire 300 to enter. Select the corresponding treatment guide wire 300 according to the treatment requirements. The treatment guide wire 300 extends through the microcatheter 210 to the lesion site such as thrombus or stenosis;

[0071] S5. Rotate the stabilizing member 400 outwards so that the front leg 430 aligns with the front card slot 620. The inner rubber ring 610 drives the front card slot 620 to deform under force and generate an elastic force, so that the front leg 430 maintains a forward position to form a limiting area, and the limiting area adapts to the outer wall contour of the treatment guide wire 300 to limit the shaking of the treatment guide wire 300, completing mechanical thrombectomy or angioplasty;

[0072] For example, during mechanical thrombectomy, contrast agent can be injected through the catheter connector 100 to confirm the location of the thrombus, and at the same time, the system tightness is maintained (not shown in detail in the figure, such as injecting contrast agent through a Y-valve, three-way valve, etc.). Among them, the treatment guide wire 300 is made of nickel-titanium alloy with superelasticity + hydrophilic coating, with both flexibility and pushability, with a diameter of 0.014 - 0.016 inches, suitable for intracranial microvessels such as the M2 segment of the middle cerebral artery. It is laser-sculpted or woven by a self-expanding metal mesh, and after expansion, it fits with the thrombus, and the spiral pore structure "cuts" the thrombus and wraps it. The proximal end of the treatment guide wire 300 is connected to a push rod, and the distal end is connected to a detachable thrombectomy stent (some models support in-situ release);

[0073] During intracranial aneurysm embolization, the operator adjusts the angle of the head end of the microcatheter 210 by rotating the micro-connector 200 to super-select the aneurysm neck. The micro-connector 200 can integrate a micro-valve structure to maintain the system tightness and prevent blood reflux or air embolism when pulling out the guide wire. When replacing different guide wires (such as changing from the path guide wire to the thrombectomy guide wire), the hemostatic function of the micro-connector 200 avoids repeated exhaust operations. Among them, the treatment guide wire 300 releases coils one by one through the push guide wire until the aneurysm cavity is completely filled, changing the blood flow direction and promoting thrombosis in the aneurysm.

[0074] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present invention, which are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A sheathless microcatheter intervention set for upper limb access, comprising an intermediate catheter (110) extending into the interior of an upper limb blood vessel catheter path formed by a guide wire, a microcatheter (210) extending into the intermediate catheter (110), and a treatment guide wire (300) extending into the microcatheter (210), characterized in that: A catheter adapter (100) is connected to the end of the intermediate catheter (110) in a communicating manner, and a micro adapter (200) is connected to the end of the micro catheter (210) in a communicating manner, where: An outer limiter (500) is sleeved on the outer wall of the catheter adapter (100) near the micro adapter (200), and an inner limiter (600) is sleeved on the outer wall of the micro adapter (200) near the front end; A stabilizing member (400) is rotatably arranged on the outer wall of the micro adapter (200). The stabilizing member (400) forms a supporting state to dynamically assist in stabilizing the micro catheter (210), the intermediate catheter (110), and the treatment guide wire (300). By rotating the stabilizing member (400) inward, it is elastically restricted within the outer limiter (500), thereby connecting the micro adapter (200) and the catheter adapter (100) in series. By rotating the stabilizing member (400) outward, it is elastically restricted within the inner limiter (600), forming a limiting area for guiding and positioning the treatment guide wire (300).

2. The sheathless microcatheter intervention set for upper limb access according to claim 1, characterized in that: The stabilizing member (400) at least includes a rear leg (420) and a front leg (430). The rear leg (420) and the end of the front leg (430) are integrally formed, and the rear leg (420) and the front leg (430) are combined to form a "V" shape; The stabilizing member (400) further includes a plurality of rotating frames (410) fixed to the outer wall of the micro adapter (200). The connection part of the rear leg (420) and the front leg (430) is rotatably arranged inside the rotating frame (410).

3. The sheathless microcatheter intervention set for upper limb access according to claim 2, wherein: The outer edges of the outer walls of the rear leg (420) and the front leg (430) both adopt an arc structure, and a rubber pad is wrapped thereon. The rubber pad is used to increase the frictional resistance for grasping the rear leg (420) and the front leg (430), and to make it more comfortable and stable when the ends of the rear leg (420) and the front leg (430) abut against the supporting surface.

4. The sheathless microcatheter intervention set for upper limb access according to claim 3, characterized in that: The outer limiter (500) at least includes an outer rubber ring (510) fixedly sleeved on the outer wall of the front end of the catheter adapter (100). The outer rubber ring (510) is made of elastic rubber material, and a plurality of rear card slots (520) are formed on the outer wall of the outer rubber ring (510). The rear card slots (520) are elastically engaged with the rear leg (420) in terms of size.

5. The sheathless microcatheter intervention set for upper limb access according to claim 4, characterized in that: The inner limiter (600) at least includes an inner rubber ring (610) fixed to the outer wall of the front end of the micro adapter (200). A plurality of front card slots (620) are formed on the outer wall of the inner rubber ring (610). The front card slots (620) are elastically engaged with the front leg (430) in terms of size.

6. The sheathless microcatheter intervention set for upper limb access according to claim 5, wherein: The outer wall of the inner rubber ring (610) is inclined and formed from the inside to the outside, and is adapted to the rotation and inclination angle of the front leg (430).

7. The sheathless microcatheter intervention set for upper limb access according to claim 1, characterized in that: The micro adapter (200) and the catheter adapter (100) are in interference fit. When the micro adapter (200) with interference fit is inserted into the catheter adapter (100), it generates a radial elastic deformation to form a uniform contact pressure.

8. The sheathless microcatheter intervention set for upper limb access according to claim 6, characterized in that: Both the front card slots (620) and the rear card slots (520) have an inner profile that is a groove, and the groove gradually expands from the outside to the inside to elastically engage the front leg (430) and the rear leg (420).

9. The sheathless microcatheter intervention set for upper limb access according to claim 8, characterized in that: The number of the rear card slots (520) is greater than the number of the rear legs (420), and the number of the front card slots (620) is greater than the number of the front legs (430).

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