A sheathless microcatheter interventional set for upper limb access

Abstract

The present invention relates to the field of catheter intervention technology, specifically, to a sheathless microcatheter interventional kit for upper limb access. It includes an intermediate catheter, a microcatheter and a treatment guidewire. The end of the intermediate catheter is connected to a catheter connector, and the end of the microcatheter is connected to a microconnector. The outer wall of the catheter connector near the microconnector is provided with an external limiter, and the outer wall of the microconnector near the front end is provided with an internal limiter; the outer wall of the microconnector is rotatably provided with a stabilizing member, and the stabilizing member forms a "V"-shaped support state to dynamically assist the stability of the microcatheter, the intermediate catheter and the treatment guidewire. On the one hand, the present invention realizes the coaxial locking effect of the stabilizing member, and on the other hand, realizes the dynamic support function of the stabilizing member at different stages, including limiting the microconnector and the catheter connector in series on one side of the stabilizing member, supporting and fixing the microcatheter separately, limiting the shaking of the treatment guidewire on one side of the stabilizing member, and supporting it on the support surface on the other side to keep it stable.

Description

Technical Field

[0001] The present invention relates to the technical field of catheter intervention, in particular to a sheathless microcatheter interventional set for upper limb access. Background Art

[0002] In the field of intravascular interventional treatment (such as neurointervention and peripheral angioplasty), microcatheter systems are widely used in scenarios such as guidewire guidance, drug delivery, and mechanical thrombectomy. Traditional operations usually rely on: a guide catheter or a long sheath to provide support to ensure that the microcatheter and guidewire can smoothly reach the target lesion. In order to reduce vascular trauma, the "sheathless microcatheter technology" has been proposed in recent years. Its core is to omit the traditional sheath and directly complete the operation through the synergy of the microcatheter and the intermediate catheter. The existing technology punctures the upper limb blood vessels with a puncture needle, inserts a path guidewire, forms a catheter path, and then extends the intermediate tube into the upper limb blood vessels along the catheter path to support the catheter path. Then, the microcatheter is extended into the intermediate tube, and then the path guidewire is pulled out, so that the treatment guidewire is extended from the microcatheter to the upper limb blood vessel treatment position for treatment operations (such as thrombectomy, drug delivery, etc.);

[0003] However, currently the intermediate tube, microcatheter, and guidewire are relatively independent, which can easily lead to the following problems:

[0004] First, during sheathless procedures, a small gap may exist between the microcatheter and the intermediate tube. When the guidewire is first inserted, the microcatheter tip may swing due to vessel curvature or respiratory movement, or even deviate from the target path. Furthermore, if the microcatheter and the intermediate tube are not restrained by each other, the guidewire may retreat during advancement due to tortuosity or spasm of upper limb vessels (such as the radial artery and brachial artery).

[0005] Secondly, whether the microcatheter is inserted into the intermediate tube or the guidewire is inserted into the microcatheter, manual maintenance of the catheter's coaxiality is required. There is no standardized fixation method, and the procedure relies on experience and auxiliary instruments (such as temporary fixation with hemostats), which increases the operator's operational burden. Given this, we propose a sheathless microcatheter interventional kit for upper extremity access. Summary of the Invention

[0006] The purpose of the present invention is to provide a sheathless microcatheter interventional kit for upper limb access to solve the problem in the above background technology that the support fixation + intermediate tube, microcatheter and guide wire cannot assist each other and thus affect each other's stability.

[0007] To achieve the above objectives, the present invention provides a sheathless microcatheter interventional kit for upper limb access, comprising an intermediate catheter inserted into a catheter path formed by a guidewire in an upper limb blood vessel, a microcatheter inserted into the intermediate catheter, and a treatment guidewire inserted into the microcatheter. The kit is characterized in that: a catheter connector is provided at the end of the intermediate catheter, and a microconnector is provided at the end of the microcatheter, wherein:

[0008] The outer wall of the catheter joint close to the micro joint is provided with an outer limiter, and the outer wall of the micro joint close to the front end is provided with an inner limiter;

[0009] The outer wall of the micro joint is provided with a stabilizing piece for rotation. The stabilizing piece forms a "V"-shaped support state to dynamically assist the stability of the microcatheter, intermediate catheter and treatment guide wire. The stabilizing piece is elastically restricted in the outer limiter by rotating inward, and the micro joint and catheter joint in series are elastically restricted in the inner limiter by rotating outward through the stabilizing piece, forming a limiting area for guiding and positioning the treatment guide wire.

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

[0011] One of the purposes is that: the stabilizing member comprises at least a rear leg and a front leg, the rear leg is integrally 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 comprises a plurality of rotating racks fixed on the outer wall of the micro joint, and the connection between the rear supporting legs and the front supporting legs is rotatably arranged inside the rotating rack.

[0013] As a further improvement of the present technical solution, the outer wall edges of the rear legs and the front legs both adopt an arc-shaped structure and are wrapped with rubber pads. The rubber pads are used to increase the friction resistance between the rear legs and the front legs, and make the ends of the rear legs and the front legs more comfortable and stable when they are against the support surface.

[0014] As a further improvement of the present technical solution, the external limiter includes at least an outer rubber ring fixedly mounted on the outer wall of the front end of the catheter connector. The outer rubber ring is made of elastic rubber material, and the outer wall of the outer rubber ring is provided with multiple rear card slots, and the rear card slots are elastically snap-fitted to the size of the rear support legs.

[0015] As a further improvement of the present technical solution, the inner limiter comprises at least an inner rubber ring fixed to the outer wall of the front end of the micro joint, and the outer wall of the inner rubber ring is provided with a plurality of front card slots, and the front card slots are elastically connected and adapted to the size of the front legs;

[0016] The outer wall of the inner rubber ring is tilted from the inside to the outside and adapts to the rotation and tilt angle of the front support leg.

[0017] Furthermore, the micro joint is interference-fitted with the catheter joint, and when the interference-fitted micro joint is inserted into the catheter joint, radial elastic deformation is generated to form a uniform contact pressure.

[0018] The second purpose is that the front clamping slot and the rear clamping slot both have inner contours that are grooves, and the grooves expand from the outside to the inside 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 present invention has the following beneficial effects:

[0021] 1. The sheathless microcatheter interventional set for upper limb access achieves a coaxial locking effect of the stabilizer, as follows:

[0022] The fixing member rotates inward and is restrained and fixed by the external stopper, so that the micro-connector and the catheter connector are coaxially locked. This prevents the treatment guide wire from initially extending from the micro-connector into the micro-catheter and pressing against the inner wall of the micro-catheter, causing the pushing force to carry the micro-catheter with it, causing the micro-catheter to retreat from the target area. Therefore, by locking the micro-connector and the catheter connector, even if the micro-catheter is pushed, it will be blocked by the supporting force of the intermediate catheter, reducing the possibility of retreat.

[0023] The stabilizing member is rotated outward and is restricted and fixed by the internal limiter, so that the stabilizing member forms a limiting area for accommodating the treatment guidewire, and the limiting area is on the same center line as the microconnector. This not only helps the treatment guidewire to extend into the interior of the microcatheter from the limiting area more accurately, but as the treatment guidewire goes deeper, the front end of the treatment guidewire is always restricted and guided, thereby improving the stability of the intervention, and preventing the treatment guidewire from drifting with the blood flow, thereby improving the efficiency of thrombus embedding.

[0024] 2. In this sheathless microcatheter interventional set for upper limb access, the stabilization component provides dynamic support at different stages, as follows:

[0025] When the microcatheter is inserted into the middle catheter and the microconnector is close to the catheter connector, it is necessary to remove the path guidewire or insert the treatment guidewire. One side of the stabilizing member restricts the microconnector and the catheter connector from being connected in series, while the other side abuts the support surface, which is equivalent to keeping the microconnector and the catheter connector supported and stable at the same time. This avoids the operator having to hold the middle catheter and microcatheter with one hand and push the treatment guidewire with the other hand, which would cause the operator to be distracted and cause displacement.

[0026] When the microcatheter is inserted into the middle catheter and needs to pause at a certain position, the "V"-shaped support formed by the stabilizing member is supported on the support surface to support and fix the microcatheter separately. The stabilizing member can be rotated and adjusted according to the curvature of the support surface until the microcatheter can be suspended and supported at a certain position more stably, making other operations more convenient for medical staff.

[0027] When the treatment guide wire reaches the target area and the treatment operation is performed, one side of the stabilizing member limits the shaking of the treatment guide wire, while the other side supports it on the supporting surface to keep it stable, thereby preventing the treatment guide wire from shaking during the treatment operation and reducing operation-related complications. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0030] Figure 3 It is a cutaway view of the overall structure of the present invention;

[0031] Figure 4 This is a cross-sectional view of the stabilizing member of the present invention assisting in supporting the micro-joint;

[0032] Figure 5 This is a schematic diagram of the coordination between the catheter connector and the micro connector of the present invention;

[0033] Figure 6 This is a support demonstration diagram of the catheter connector and the micro connector of the present invention when they are matched;

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

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

[0036] Figure 9 It is a cross-sectional view of the external limiter of the present invention.

[0037] The meaning of each number in the figure is:

[0038] 100, catheter connector; 110, intermediate catheter; 200, micro connector; 210, micro catheter; 300, treatment guidewire;

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

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Example 1

[0043] See also Figures 1-8As shown, this embodiment provides a sheathless microcatheter interventional kit for upper limb access, including an intermediate catheter 110 inserted into the inner part of the upper limb vascular catheter path formed by the path guide wire, a microcatheter 210 inserted into the intermediate catheter 110, and a treatment guide wire 300 inserted into the microcatheter 210. When performing microcatheter intervention through the upper limb access, first, by using a 21G-22G micropuncture needle to puncture the radial artery / brachial artery, the risk of vascular injury is greatly reduced, and a 0.014- A 0.018-inch hydrophilic guidewire is used as a path guidewire (diameter of 0.18mm-0.46mm) to establish an initial channel, that is, a catheter path. The intermediate catheter 110 (outer diameter of 2.3mm-2.8mm, inner diameter of 1.78mm-2.24mm) is directly introduced along the path guidewire. The intermediate catheter 110 provides sufficient rigidity and coaxiality to support the subsequent microcatheter 210 (outer diameter of 0.56mm-0.93mm, inner diameter of 0.43mm). mm-0.69mm") into the deep blood vessels, then, the microcatheter 210 is sent into the intermediate catheter 110, directly to the target area, confirming that the microcatheter 210 is in place, the path guidewire is removed, and the treatment guidewire 300 is ready to enter. According to the treatment needs, a corresponding treatment guidewire 300 is selected, such as a thrombus removal stent guidewire, a balloon guidewire, etc. The treatment guidewire 300 is extended through the microcatheter 210 to the lesion site such as thrombus or stenosis to complete mechanical thrombus removal or angioplasty. On the basis of the above, the improvement of the present invention is: specifically, as shown in FIG. Figure 1-3 As shown, the end of the intermediate catheter 110 is connected to a catheter connector 100, and the end of the micro-catheter 210 is connected to a micro-connector 200, wherein:

[0044] An outer wall of the catheter connector 100 near the micro connector 200 is provided with an outer stopper 500, and an outer wall of the micro connector 200 near the front end is provided with an inner stopper 600;

[0045] The outer wall of the micro connector 200 is rotated with a stabilizing member 400, which forms a "V"-shaped support state to dynamically assist the stability of the microcatheter 210, the intermediate catheter 110 and the treatment guidewire 300. The automatic locking function of the stabilizing member 400 frees the operator's hands, shortens the operation time, and reduces mechanical stimulation to the vascular endothelium such as "bouncing" of the microcatheter head by suppressing unnecessary movement of the catheter / guidewire system. The stabilizing member 400 is elastically limited to the outer limiter 500 by rotating inward, and the serial micro connector 200 and the catheter connector 100 are elastically limited to the inner limiter 600 by rotating outward through the stabilizing member 400, forming a limiting area for guiding and positioning the treatment guidewire 300.

[0046] Based on the above structure, the present invention takes into account that during sheathless operation, a small gap may exist between the microcatheter and the intermediate tube. When the guidewire is first inserted, the microcatheter tip may swing due to blood vessel bending or respiratory movement. In addition, due to tortuosity or spasm of upper limb blood vessels such as the radial artery and brachial artery, there is no mutual restraint between the microcatheter and the intermediate tube, which may cause "tube retreat" when pushing the guidewire. Therefore, on the one hand, the coaxial locking effect of the stabilizing member 400 is achieved, as follows:

[0047] like Figure 5 As shown, the fixing member 400 rotates inward and is restrained and fixed by the external stopper 500, so that the micro connector 200 and the catheter connector 100 are coaxially locked. This prevents the treatment guide wire 300 from initially extending from the micro connector 200 into the microcatheter 210. The treatment guide wire 300 initially extends into the microcatheter 210 and presses against the inner wall of the microcatheter 210, causing the pushing force to move the microcatheter 210 together, causing the microcatheter 210 to retreat and leave the target area. Therefore, by locking the micro connector 200 and the catheter connector 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, thereby reducing the possibility of retreat.

[0048] like Figure 7 As shown, the stabilizing member 400 is rotated outward and is restrained and fixed by the internal stopper 600, so that the stabilizing member 400 forms a restraining area for accommodating the treatment guidewire 300. The restraining area is co-axial with the micro-connector 200. This not only facilitates more accurate insertion of the treatment guidewire 300 from the restraining area into the interior of the microcatheter 210, but also, as the treatment guidewire 300 penetrates deeper, the front end of the treatment guidewire 300 is always restrained and guided, thereby improving the stability of the intervention and preventing the treatment guidewire 300 from drifting with the blood flow, thereby improving the efficiency of thrombus insertion.

[0049] Furthermore, whether the microcatheter is inserted into the intermediate tube or the guidewire is inserted into the microcatheter, the coaxiality of the catheter must be maintained manually. There is no standardized fixation method, and temporary fixation relies on experience and auxiliary instruments such as hemostats, which increases the operator's operational burden. Therefore, on the other hand, the dynamic support function of the stabilizer 400 is achieved at different stages, as follows:

[0050] like Figure 6 As shown, when the microcatheter 210 is inserted into the interior of the intermediate catheter 110 and the microconnector 200 is close to the catheter connector 100, it is necessary to remove the path guidewire or insert the treatment guidewire 300. The stabilizing member 400 restricts the microconnector 200 and the catheter connector 100 in series on one side, while the other side abuts the support surface, which is equivalent to keeping the microconnector 200 and the catheter connector 100 synchronously supported and stable, thereby preventing the operator from having to hold the intermediate catheter 110 and microcatheter 210 with one hand and push the treatment guidewire 300 with the other hand, which would cause distraction and displacement.

[0051] like Figure 4As shown, when the microcatheter 210 is inserted into the interior of the intermediate catheter 110 to a certain position and needs to be paused, the "V"-shaped support formed by the stabilizing member 400 is supported on the support surface to independently support and fix the microcatheter 210. The stabilizing member 400 can be rotated and adjusted according to the curvature of the support surface until the microcatheter 210 can be suspended and supported at a certain position to be more stable, making other operations more convenient for medical staff.

[0052] like Figure 8 As shown, when the treatment guide wire 300 reaches the target area and performs the treatment operation, one side of the stabilizing member 400 limits the shaking of the treatment guide wire 300, and the other side supports it on the support surface to keep it stable, thereby preventing the treatment guide wire 300 from shaking during the treatment operation and reducing operation-related complications.

[0053] And, the specific structure is further explained in detail:

[0054] First, to achieve that the stabilizer 400 can dynamically support and connect the catheter connector 100 and the micro connector 200 in series, as well as limit the shaking of the treatment guidewire 300, the specific structure of the stabilizer 400 is further disclosed. The stabilizer 400 includes at least a rear leg 420 and a front leg 430. The ends of the rear leg 420 and the front leg 430 are integrally connected, and the rear leg 420 and the front leg 430 are combined to form a "V" shape.

[0055] The stabilizing member 400 further includes a plurality of rotating racks 410 fixed to the outer wall of the micro-joint 200. The connection between the rear legs 420 and the front legs 430 is rotatably disposed within the rotating racks 410. By rotating the stabilizing member 400, that is, the connection between the rear legs 420 and the front legs 430 is rotatably regulated within the rotating racks 410, the rear legs 420 and the front legs 430 can be adjusted to adapt to the inclination angle of the support surface when supporting in coordination. This further facilitates the micro-catheter 210 from falling onto the patient's skin support surface due to gravity and causing pressure sores and contamination when the micro-catheter 210 is released for other operations.

[0056] In addition, multiple groups of stabilizing members 400 are provided. If two support points on a stabilizing member 400 (two support points formed by the ends of the rear legs 420 and the front legs 430 respectively contacting the skin) are tilted to the left or right by external force, they will immediately be further supported by the adjacent stabilizing members 400. The two adjacent stabilizing members 400 will also assist each other to form four support points that are more stable, making it convenient for medical staff to adjust the support stability as needed.

[0057] Specifically, the outer wall edges of the rear leg 420 and the front leg 430 both adopt an arc structure and are wrapped with rubber pads. The rubber pads are used to increase the friction resistance of the rear leg 420 and the front leg 430, so that medical staff can hold the rear leg 420 and the front leg 430, that is, contact the rubber pads to drive the microcatheter 210 to rotate and change the angle of insertion into the blood vessel, and make the ends of the rear leg 420 and the front leg 430 more comfortable and stable when they are against the support surface. The rubber pads are elastic and can contact the skin more comfortably if the support surface is skin. At the same time, the rubber pads have a certain degree of roughness, which can improve the anti-slip effect of the support.

[0058] Then, in order to realize that the stabilizing member 400 rotates inward and is locked by the external limiter 500, and the micro joint 200 and the catheter joint 100 are connected in series, it is necessary to further disclose the structure of the external limiter 500, so that the external limiter 500 at least includes an outer rubber ring 510 fixedly sleeved on the outer wall of the front end of the catheter joint 100, the outer rubber ring 510 is made of elastic rubber material, and the outer wall of the outer rubber ring 510 is provided with a plurality of rear card slots 520, and the rear card slots 520 are elastically connected and adapted to the size of the rear support legs 420. By rotating the stabilizing member 400, the rear support legs 420 are aligned with the interior of the rear card slots 520 and inserted, so that the rear card slots 520 are deformed by the extrusion force to generate elastic force, and the elastic force clamps and limits the rear support legs 420, which is equivalent to the rear support legs 420 acting as a bridge for the micro joint 200 and the catheter joint 100 to be connected in series, thereby realizing the synchronous support and stability of the auxiliary micro joint 200 and the catheter joint 100.

[0059] Similarly, in order to realize the outward rotation of the stabilizing member 400 to form a limiting area, which can limit the shaking of the treatment guide wire 300, the internal limiter 600 is further disclosed, so that the internal limiter 600 at least includes an inner rubber ring 610 fixed to the outer wall of the front end of the micro joint 200, and the outer wall of the inner rubber ring 610 is provided with multiple front card slots 620, and the front card slots 620 are elastically adapted to the size of the front support legs 430. By rotating the stabilizing member 400 outward, the front support legs 430 are driven to align with the front card slots 620 and be slotted, so that the front card slots 620 are deformed by the extrusion force to generate elastic force, and the elastic force squeezes and fixes the front support legs 430, so that the limiting area formed at the end of the front support legs 430 just clamps and limits the shaking of the treatment guide wire 300.

[0060] Among them, in order to ensure structural integrity, the outer wall of the inner rubber ring 610 is tilted from the inside to the outside, and adapts to the rotation and tilt angle of the front support leg 430. When the front support leg 430 rotates to form a limited area, it will not cause squeezing of the inner rubber ring 610. It just fits the outer wall of the inner rubber ring 610 to avoid squeezing that affects the service life of the inner rubber ring 610.

[0061] It is worth noting that the micro connector 200 and the catheter connector 100 have an interference fit. When the interference-fitted micro connector 200 is inserted into the catheter connector 100, radial elastic deformation is generated to form a uniform contact pressure. The inner diameter of the micro connector 200 is slightly smaller than the outer diameter of the catheter connector 100, usually with a difference of 0.02-0.05mm. When pushing the spring coil or aspirating thrombus, it can withstand an axial tension of more than 5N, avoiding the connector separation caused by blood flow impact or catheter torsional deformation, which is particularly suitable for high-torque thrombectomy scenarios. In addition, the interference fit connection has no steps or gaps, and the inner wall smoothness is close to that of the catheter body, which can reduce the risk of turbulence, reduce the probability of thrombosis, avoid contrast agent retention, and improve image clarity.

[0062] The operator only needs to press the micro connector 200 vertically into the catheter connector 100 without rotating it to lock it, and the two can also be locked.

[0063] Example 2:

[0064] like Figure 9 As shown, in order to achieve the limiting strength of the front support leg 430 inserted into the front slot 620 and the limiting strength of the rear support leg 420 inserted into the rear slot 520, this example is different from Example 1 in that: the front slot 620 and the rear slot 520 both adopt an inner contour that is a groove, and the groove expands from the outside to the inside to elastically clamp the front support leg 430 and the rear support leg 420, so that when the front support leg 430 and the rear support leg 420 are respectively inserted into the front slot 620 and the rear slot 520, they can enter the interior of the groove from the narrow gap, so that when the front support leg 430 and the rear support leg 420 are completely located in the front slot 620 and the rear slot 520, the narrow gap reduces the possibility of the front support leg 430 and the rear support leg 420 falling off, thereby improving the elastic clamping strength.

[0065] Specifically, the number of rear slots 520 is greater than the number of rear legs 420, and the number of front slots 620 is greater than the number of front legs 430, which means that the rear slots 520 and the front slots 620 are arranged more densely, which is conducive to the probability that the rear legs 420 and the front legs 430 are respectively aligned with the rear slots 520 and the front slots 620 at any angle, thereby increasing 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 with a micropuncture needle, then insert a hydrophilic guidewire as a pathway guidewire to establish the initial channel, that is, the catheter pathway;

[0068] S2. The intermediate catheter 110 is directly delivered along the guidewire. The intermediate catheter 110 provides sufficient rigidity and coaxiality to support the subsequent microcatheter 210 to enter the deep blood vessels.

[0069] S3. Insert the microcatheter 210 into the intermediate catheter 110. During this process, the microcatheter 210 can be suspended at any time by the "V" support formed by the rear legs 420 and the front legs 430. The microcatheter 210 that has not been fully inserted does not need to fall on the patient's skin support surface due to gravity, causing pressure sores and contamination. Until it reaches the target area, the microconnector 200 is brought close to the catheter connector 100. The stabilizing member 400 is rotated, and the rear legs 420 are inserted into the rear slots 520. The outer rubber ring 510 uses the elastic force generated by the squeezing inside the rear slots 520 to restrict the rear legs 420, so that the microconnector 200 and the catheter connector 100 are locked. The microconnector 200 and the catheter connector 100 can be rotated and pulled synchronously, and can also be supported and stabilized by the front legs 430.

[0070] S4. Remove the path guidewire and prepare for the insertion of the treatment guidewire 300. Select the corresponding treatment guidewire 300 according to the treatment needs. The treatment guidewire 300 is inserted into the lesion site such as thrombus or stenosis through the microcatheter 210.

[0071] S5. Rotate the stabilizing member 400 outward to align the front leg 430 with the front retaining groove 620. The inner rubber ring 610 causes the front retaining groove 620 to deform under stress and generate elastic force, which keeps the front leg 430 forward to form a limiting area. The limiting area is adapted to the outer wall contour of the treatment guidewire 300, limiting the shaking of the treatment guidewire 300 and completing the 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 while maintaining the system's airtightness. The figure does not show in detail the Y-valve and three-way valve for injecting contrast agent. The therapeutic guidewire 300 is made of nickel-titanium alloy with superelasticity and a hydrophilic coating, which is both flexible and pushable. Its diameter is 0.014-0.016 inches, suitable for small intracranial blood vessels such as the M2 segment of the middle cerebral artery. It is laser-engraved or woven with a self-expanding metal mesh, which expands and fits into the thrombus. The spiral pore structure "cuts" the thrombus and encapsulates it. The proximal end of the therapeutic guidewire 300 is connected to a push rod, and the distal end is connected to a detachable thrombectomy stent, some models of which support in situ release.

[0073] During intracranial aneurysm embolization, the operator adjusts the angle of the tip of the microcatheter 210 by rotating the microconnector 200 to superselect the aneurysm neck. The microconnector 200 can be integrated with a microvalve structure to maintain the system's airtightness when the guidewire is pulled out to prevent blood reflux or air embolism. When changing different guidewires, such as from a path guidewire to a thrombectomy guidewire, the hemostatic function of the microconnector 200 avoids repeated exhaust operations. Among them, the treatment guidewire 300 releases the spring coils one by one by pushing the guidewire until the aneurysm cavity is completely filled, changing the direction of blood flow and promoting thrombosis within the tumor.

[0074] The above shows and describes 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 to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A sheathless microcatheter interventional kit for upper limb access, comprising an intermediate catheter (110) inserted into a catheter path formed by a guidewire for an upper limb blood vessel, a microcatheter (210) inserted into the intermediate catheter (110), and a treatment guidewire (300) inserted into the microcatheter (210), characterized in that: The end of the intermediate conduit (110) is connected to a conduit connector (100), and the end of the micro-conduit (210) is connected to a micro-connector (200), wherein: An outer wall of the catheter connector (100) close to the micro connector (200) is provided with an outer stopper (500), and an outer wall of the micro connector (200) close to the front end is provided with an inner stopper (600); The outer wall of the micro joint (200) is provided with a stabilizing member (400) for rotation. The stabilizing member (400) forms a supporting state to dynamically assist the micro catheter (210), the intermediate catheter (110) and the treatment guide wire (300) in stabilizing. The stabilizing member (400) is elastically limited in the outer limiter (500) when rotating inward, and the serial micro joint (200) and the catheter joint (100) are elastically limited in the inner limiter (600) when rotating outward through the stabilizing member (400), forming a limiting area for guiding and positioning the treatment guide wire (300).

2. The sheathless microcatheter interventional kit for upper limb access according to claim 1, characterized in that: The stabilizing member (400) comprises at least a rear leg (420) and a front leg (430), wherein the ends of the rear leg (420) and the front leg (430) are integrally connected, and the rear leg (420) and the front leg (430) are combined to form a "V" shape; The stabilizing member (400) further comprises a plurality of rotating racks (410) fixed to the outer wall of the micro joint (200), and the connection between the rear supporting legs (420) and the front supporting legs (430) is rotatably arranged inside the rotating racks (410).

3. The sheathless microcatheter interventional kit for upper limb access according to claim 2, characterized in that: The outer wall edges of the rear supporting leg (420) and the front supporting leg (430) are both arc-shaped and wrapped with rubber pads. The rubber pads are used to increase the friction resistance of the rear supporting leg (420) and the front supporting leg (430) and make the ends of the rear supporting leg (420) and the front supporting leg (430) more comfortable and stable when they are against the support surface.

4. The sheathless microcatheter interventional kit for upper limb access according to claim 3, characterized in that: The outer limiter (500) comprises at least an outer rubber ring (510) fixedly sleeved on the outer wall of the front end of the catheter connector (100), the outer rubber ring (510) being made of elastic rubber material, and a plurality of rear slots (520) being provided on the outer wall of the outer rubber ring (510), the rear slots (520) being elastically snap-fitted to the size of the rear legs (420).

5. The sheathless microcatheter interventional kit for upper limb access according to claim 4, characterized in that: The inner limiter (600) comprises at least an inner rubber ring (610) fixed to the outer wall of the front end of the micro joint (200), and the outer wall of the inner rubber ring (610) is provided with a plurality of front card slots (620), and the front card slots (620) are elastically snap-fitted to the size of the front legs (430).

6. The sheathless microcatheter interventional kit for upper limb access according to claim 5, characterized in that: The outer wall of the inner rubber ring (610) is tilted from the inside to the outside and adapts to the rotation and tilt angle of the front support leg (430).

7. The sheathless microcatheter interventional kit for upper limb access according to claim 1, characterized in that: The micro joint (200) is interference-fitted with the catheter joint (100), and when the interference-fitted micro joint (200) is inserted into the catheter joint (100), radial elastic deformation is generated, thereby forming a uniform contact pressure.

8. The sheathless microcatheter interventional kit for upper limb access according to claim 6, characterized in that: The front clamping slot (620) and the rear clamping slot (520) both have inner profiles that are grooves, and the grooves are sequentially expanded from the outside to the inside to elastically clamp the front supporting leg (430) and the rear supporting leg (420).

9. The sheathless microcatheter interventional kit 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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