An interventional catheter assembly for cardiovascular and cerebrovascular care

Abstract

The present invention provides an interventional catheter assembly for cardiovascular and cerebrovascular care, which relates to the technical field of medical devices, comprising: a catheter, a guidewire, a first sleeve, a first expandable stent, at least one second sleeve and at least one second expandable stent; the sleeve is sleeved on the outside of the guidewire and located in the catheter; the expandable stent is arranged on the sleeve and compressed in the catheter; a plurality of mounting rings are arranged in the first sleeve and one of the mounting rings is fixedly connected to the guidewire, while two mounting rings on both axial sides are fixedly connected to the first sleeve; the two mounting rings are respectively fixedly connected to the two axial ends of the second sleeve and the mounting ring away from the first sleeve is fixedly connected to the guidewire; when the first sleeve and the second sleeve are separated from the catheter and then pass through a curved blood vessel, under the action of the guidewire and the mounting ring, the curved first sleeve is longer than that in a straight state, and the guidewire drives the second sleeve to contract toward the first sleeve, so that the second expandable stent further expands and can be offset toward the outer bend of the blood vessel, so that it is close to the blood vessel wall to prevent thrombus from escaping.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an interventional catheter assembly for cardiovascular and cerebrovascular care. Background Art

[0002] Thrombectomy surgery usually uses a catheter to be inserted into the patient's blood vessel. The catheter is equipped with a guide wire and an expandable stent fixed on the guide wire. After the catheter moves to the location of the thrombus, the catheter is withdrawn. The expandable stent detaches from the catheter and expands. At this time, the withdrawn guide wire can drag the thrombus out of the blood vessel. In the prior art, when the expandable stent passes through a curved blood vessel, the inner and outer bends of the expandable stent are subjected to different forces, resulting in a gap between the expandable stent and the blood vessel wall. The thrombus adhered to the expandable stent is easy to escape from the blood vessel, affecting the surgical operation and increasing the surgical risk.

[0003] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of implication that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] Based on this, it is necessary to provide an interventional catheter assembly for cardiovascular care to address the problem that a gap appears between the current expandable stent and the blood vessel wall when passing through a curved blood vessel, causing the thrombus adhered to the expandable stent to easily escape.

[0005] The above purpose is achieved through the following technical solutions:

[0006] An interventional catheter assembly for cardiovascular and cerebrovascular care, comprising:

[0007] The tubular body unit comprises a catheter and a guide wire, wherein the guide wire passes through the catheter and both ends of the guide wire are located outside the catheter; the end of the catheter that first enters the blood vessel is the leading end;

[0008] The expansion unit comprises a first sleeve, a first expansion bracket, at least one second sleeve and at least one second expansion bracket; the first sleeve and the second sleeve are both sleeved on the outside of the guide wire and located in the catheter; the first expansion bracket is arranged on the first sleeve and compressed in the catheter, and the second expansion bracket is arranged on the second sleeve and compressed in the catheter; the second sleeve abuts against the axial end of the first sleeve and at least one second sleeve is located on the side of the first sleeve close to the head end of the catheter; the first sleeve and the second sleeve both have the ability of elastic deformation;

[0009] The support unit includes a plurality of mounting rings which are sleeved outside the guide wire and located inside the first sleeve or the second sleeve; the mounting ring is a rigid member; a plurality of mounting rings are stacked inside the first sleeve and two mounting rings at both axial ends are fixedly connected to the first sleeve; one of the mounting rings inside the first sleeve is fixed to the guide wire; the mounting ring located inside the first sleeve and fixed to the guide wire is mounting ring a, the mounting rings located at both axial ends of the first sleeve are mounting ring b, and there is at least one mounting ring between mounting ring a and mounting ring b; the two mounting rings are respectively fixedly connected to the two axial ends of the second sleeve and the mounting ring far away from the first sleeve is fixedly connected to the guide wire.

[0010] Furthermore, the number of the second sleeve is one and is located on a side of the first sleeve close to the first end of the catheter; the mounting ring a is located at the axial end of the first sleeve away from the first end of the catheter.

[0011] Furthermore, the number of the second sleeves is two and they are respectively located on both axial sides of the first sleeve; the mounting ring a is located at the axial midpoint of the first sleeve.

[0012] Furthermore, the support unit also includes a plurality of long pins; the mounting ring is provided with a first mounting hole cooperating with the long pin, and the guide wire is provided with a second mounting hole cooperating with the long pin; the long pin radially penetrates the first sleeve or the second sleeve and cooperates with the first mounting hole and the second mounting hole, thereby fixing the mounting ring to the guide wire.

[0013] Furthermore, the support unit also includes a plurality of short pins; the mounting ring is provided with a third mounting hole cooperating with the short pins; the short pins radially penetrate the first sleeve or the second sleeve and cooperate with the third mounting hole, thereby fixing the mounting ring to the first sleeve or the second sleeve.

[0014] Furthermore, the diameters of the long pin and the short pin are the same.

[0015] Furthermore, the number of the second mounting holes is plural and they are arranged along the axial direction of the guide wire.

[0016] Furthermore, the first expandable stent and the second expandable stent each include a plurality of convex-shaped elastic members; the protruding portions of the elastic members extend toward the axial direction of the guide wire, and the plurality of elastic members are circumferentially connected end to end to form an expansion ring; the plurality of expansion rings are connected along the axial direction of the guide wire to form the first expandable stent or the second expandable stent; the axial length of the first expandable stent is greater than the axial length of the second expandable stent.

[0017] Furthermore, the diameter of the first expansion bracket when it is not deformed is larger than the outer diameter of the first sleeve, and the two ends of the first expansion bracket are bent toward the axis of the first expansion bracket and connected to the first sleeve; the diameter of the second expansion bracket when it is not deformed is larger than the outer diameter of the second sleeve, and the two ends of the second expansion bracket are bent toward the axis of the second expansion bracket and connected to the second sleeve.

[0018] Furthermore, the tubular body unit also includes a Y-shaped valve; the Y-shaped valve is arranged on the catheter, and the guide wire passes through the Y-shaped valve and then enters the catheter.

[0019] The beneficial effects of the present invention are:

[0020] The guide wire of the present invention passes through the catheter. During the operation, the guide wire is pushed first and then the catheter is pushed to advance the catheter in the blood vessel. When the first expandable stent and the second expandable stent move to the thrombus, the catheter is withdrawn. At this time, the first expandable stent and the second expandable stent detach from the catheter and begin to expand and adhere to the thrombus. After complete adhesion, the withdrawn guide wire can pull the thrombus out of the blood vessel; when the first sleeve and the second sleeve pass through the curved blood vessel, the multiple mounting rings in the first sleeve are unfolded along the guide wire, that is, the multiple mounting rings abut against each other on the side close to the inner bend of the guide wire, and gaps appear between the multiple mounting rings on the side close to the outer bend of the guide wire. Under the support and restriction of the multiple mounting rings, the first sleeve will not be greatly deformed when bent, so as to avoid the first expandable stent from bursting the blood vessel; the bent first sleeve is stretched relative to the first sleeve in a straight state, and the mounting ring b close to the second sleeve drives the axial end of the first sleeve away from the mounting ring a. At this time, the first sleeve The guidewire is longer than the guidewire in the first sleeve in the straight state, so that the guidewire in the first sleeve has a retraction effect. Since the axial end of the first sleeve away from the second sleeve and the axial end of the second sleeve away from the first sleeve are both fixed to the guidewire, the retraction of the guidewire can drive the second sleeve to axially contract, so that the second expandable bracket on the second sleeve further expands to prevent the thrombus from escaping; in addition, the retraction of the guidewire can drive the end of the second sleeve away from the first sleeve to deviate toward the outer bend of the blood vessel, so that the second expandable bracket is close to the blood vessel wall, further preventing the thrombus from escaping; the greater the distance between the mounting ring a and the mounting ring b, the greater the deformation of the first sleeve when passing through the curved blood vessel, the greater the degree to which the guidewire drives the second sleeve to axially contract toward the first sleeve, and the greater the degree of expansion of the second expandable bracket. Therefore, the expansion degree of the second expandable bracket can be adjusted by changing the position of the mounting ring a in the first sleeve to fit closely to blood vessels of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an interventional catheter assembly for cardiovascular and cerebrovascular care according to an embodiment of the present invention;

[0022] Figure 2An exploded view of an interventional catheter assembly for cardiovascular and cerebrovascular care according to an embodiment of the present invention;

[0023] Figure 3 A top view of an interventional catheter assembly for cardiovascular and cerebrovascular care according to an embodiment of the present invention;

[0024] Figure 4 for Figure 3 Sectional view of the middle AA plane;

[0025] Figure 5 for Figure 4 Enlarged view at P in the middle;

[0026] Figure 6 It is a schematic structural diagram of an expansion unit in an embodiment of the present invention expanding under a straight blood vessel;

[0027] Figure 7 This is a schematic structural diagram of an expansion unit in an embodiment of the present invention expanding under a curved blood vessel;

[0028] Figure 8 Another structural schematic diagram of an expansion unit according to an embodiment of the present invention expanding under a curved blood vessel;

[0029] Fig. 9 It is a schematic diagram of the three-dimensional structure of an expansion unit according to an embodiment of the present invention.

[0030] Among them: 100, tube body unit; 101, catheter; 102, guide wire; 1021, second mounting hole; 103, Y-type valve; 200, expansion unit; 201, first sleeve; 202, first expansion bracket; 203, second sleeve; 204, second expansion bracket; 300, support unit; 301, mounting ring; 302, long pin; 303, short pin. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] Combine the following Figure 1-Figure 9 , describing an interventional catheter assembly for cardiovascular and cerebrovascular care according to an embodiment of the present invention.

[0035] An interventional catheter assembly for cardiovascular and cerebrovascular care, comprising:

[0036] The tubular body unit 100 includes a catheter 101 and a guide wire 102. The guide wire 102 passes through the catheter 101 and both ends of the guide wire 102 are located outside the catheter 101. The end of the catheter 101 that first enters the blood vessel is the first end.

[0037] The expansion unit 200 includes a first sleeve 201, a first expansion bracket 202, at least one second sleeve 203 and at least one second expansion bracket 204; the first sleeve 201 and the second sleeve 203 are both sleeved on the outside of the guide wire 102 and located in the catheter 101; the first expansion bracket 202 is arranged on the first sleeve 201 and compressed in the catheter 101, and the second expansion bracket 204 is arranged on the second sleeve 203 and compressed in the catheter 101; the second sleeve 203 abuts against the axial end of the first sleeve 201 and at least one second sleeve 203 is located on the side of the first sleeve 201 close to the head end of the catheter 101; the first sleeve 201 and the second sleeve 203 both have the ability of elastic deformation;

[0038] The support unit 300 includes a plurality of mounting rings 301 which are sleeved outside the guide wire 102 and located in the first sleeve 201 or the second sleeve 203; the mounting rings 301 are rigid parts; a plurality of mounting rings 301 are stacked in the first sleeve 201 and two mounting rings 301 at both axial ends are fixedly connected to the first sleeve 201; one of the mounting rings 301 in the first sleeve 201 is fixed to the guide wire 102; the mounting ring 301 located in the first sleeve 201 and fixed to the guide wire 102 is called mounting ring a, and the mounting rings 301 located at both axial ends of the first sleeve 201 are called mounting ring b, and there is at least one mounting ring 301 between the mounting ring a and the mounting ring b; the two mounting rings 301 are respectively fixedly connected to the two axial ends of the second sleeve 203 and the mounting ring 301 far away from the first sleeve 201 is fixedly connected to the guide wire 102.

[0039] When the first sleeve 201 and the second sleeve 203 pass through a curved blood vessel, the multiple mounting rings 301 in the first sleeve 201 are deployed along the guide wire 102, that is, the multiple mounting rings 301 close to the inner bend of the guide wire 102 abut against each other, and gaps appear between the multiple mounting rings 301 close to the outer bend of the guide wire 102. Under the support and restriction of the multiple mounting rings 301, the first sleeve 201 will not bend at a large angle, thereby preventing the first expandable stent 202 from bursting the blood vessel; the curved first sleeve 201 is elongated relative to the first sleeve 201 in a straight state, and the mounting ring b close to the second sleeve 203 drives the axial end of the first sleeve 201 away from the mounting ring a. At this time, the guide wire 102 in the first sleeve 201 is longer than the guide wire 102 in the first sleeve 201 in a straight state, so that the guide wire 102 in the first sleeve 201 has a retraction effect. Since the first sleeve 201 is away from the axial end of the second sleeve 203 and the second The axial ends of the sleeve 203 away from the first sleeve 201 are fixedly connected to the guide wire 102. The retraction of the guide wire 102 can drive the second sleeve 203 to axially contract, so that the second expandable bracket 204 on the second sleeve 203 further expands to prevent the thrombus from escaping; in addition, the retraction of the guide wire 102 can drive the end of the second sleeve 203 away from the first sleeve 201 to deviate toward the outer bend of the blood vessel, so that the second expandable bracket 204 is close to the blood vessel wall, further preventing the thrombus from escaping; the greater the distance between the mounting ring a and the mounting ring b close to the second sleeve 203, the greater the deformation of the first sleeve 201 when passing through the curved blood vessel, the greater the degree of axial contraction of the second sleeve 203 toward the first sleeve 201 driven by the guide wire 102, and the greater the expansion degree of the second expandable bracket 204. Therefore, the expansion degree of the second expandable bracket 204 can be adjusted by changing the position of the mounting ring a in the first sleeve 201 to fit closely to blood vessels of different sizes.

[0040] In blood vessels with different degrees of curvature, the first sleeve 201 and the second sleeve 203 have different degrees of curvature, so that the guide wire 102 in the first sleeve 201 is retracted to different degrees, so that the end of the second sleeve 203 away from the first sleeve 201 is offset to different degrees toward the outer curvature of the blood vessel, and the expansion degree of the second expandable stent 204 is also different, so as to achieve the effect of the second expandable stent 204 automatically adjusting its own expansion degree according to the curvature of the blood vessel.

[0041] In one embodiment, the number of the second sleeve 203 is one and it is located on the side of the first sleeve 201 close to the head end of the catheter 101; the mounting ring a is located at the axial end of the first sleeve 201 away from the head end of the catheter 101. This structure is suitable for scenarios where there are no tributaries in the blood vessel. When the first sleeve 201 and the second sleeve 203 pass through a curved blood vessel, the retraction of the guide wire 102 toward the first sleeve 201 can drive the second sleeve 203 to axially contract, so that the second expansion bracket 204 on the second sleeve 203 further expands to prevent the thrombus from escaping. In addition, the retraction of the guide wire 102 can drive the end of the second sleeve 203 away from the first sleeve 201 to deviate toward the outer bend of the blood vessel, so that the second expansion bracket 204 is close to the blood vessel wall, further preventing the thrombus from escaping.

[0042] In one embodiment, there are two second sleeves 203, which are respectively located on both axial sides of the first sleeve 201; the mounting ring a is located at the axial midpoint of the first sleeve 201. This structure is suitable for scenarios where there are tributaries in the blood vessel. When the first sleeve 201 and the second sleeve 203 pass through a curved blood vessel, the guide wire 102 in the first sleeve 201 and the second sleeve 203 tends to be retracted toward the middle section of the first sleeve 201, and the ends of the two second sleeves 203 away from the first sleeve 201 are offset toward the outer bend of the blood vessel, so that the second expansion stent 204 is close to the blood vessel wall, so that the second expansion stent 204 on the second sleeve 203 is further expanded, preventing thrombus from escaping from two directions.

[0043] In one embodiment, the support unit 300 also includes a plurality of long pins 302; the mounting ring 301 is provided with a first mounting hole that cooperates with the long pin 302, and the guide wire 102 is provided with a second mounting hole 1021 that cooperates with the long pin 302; the long pin 302 radially penetrates the first sleeve 201 or the second sleeve 203 and cooperates with the first mounting hole and the second mounting hole 1021, thereby fixing the mounting ring 301 to the guide wire 102.

[0044] The first sleeve 201 and the second sleeve 203 may have the same outer diameter and the same inner diameter. The first sleeve 201 and the second sleeve 203 are provided with a through hole for the long pin 302 to pass through. The cooperation between the long pin 302 and the first mounting hole may be an interference fit, so that the long pin 302 and the mounting ring 301 are connected more tightly; the diameter of the guide wire 102 is greater than the thickness of the mounting ring 301, and the cooperation between the long pin 302 and the second mounting hole 1021 may be a clearance fit, so that the long pin 302 can pass through the guide wire 102 more smoothly and cooperate with the mounting ring 301.

[0045] The axial length of the long pin 302 may be the sum of the two wall thicknesses of the first sleeve 201 or the second sleeve 203 and the diameter of the mounting ring 301 .

[0046] In one embodiment, the support unit 300 also includes a plurality of short pins 303; the mounting ring 301 is provided with a third mounting hole that cooperates with the short pins 303; the short pins 303 radially penetrate the first sleeve 201 or the second sleeve 203 and cooperate with the third mounting hole, thereby fixing the mounting ring 301 to the first sleeve 201 or the second sleeve 203.

[0047] The short pin 303 and the third mounting hole may be fitted with an interference fit, so that the short pin 303 is tightly connected to the mounting ring 301. The length of the short pin 303 may be the sum of the wall thickness of the first sleeve 201 or the second sleeve 203 and the thickness of the mounting ring 301, so that after the first sleeve 201 or the second sleeve 203 and the mounting ring 301 are connected by the short pin 303, the mounting ring 301 can still slide along the guide wire 102.

[0048] In one embodiment, the diameters of the long pin 302 and the short pin 303 may be the same to facilitate processing and manufacturing.

[0049] The first sleeve 201 and the second sleeve 203 are both provided with through holes that cooperate with the long pin 302 and the short pin 303. Limit blocks can be set at the ends of the long pin 302 and the short pin 303. The radial length of the limit block along the long pin 302 or the short pin 303 is greater than the diameter of the through hole on the first sleeve 201 and the second sleeve 203, preventing the end of the long pin 302 or the short pin 303 close to the limit block from entering the inner cavity of the first sleeve 201 or the second sleeve 203.

[0050] In one embodiment, there are multiple second mounting holes 1021 and they are arranged along the axial direction of the guide wire 102. By matching the first sleeve 201 or the second sleeve 203 with the second mounting holes 1021 at different positions, the first expandable stent 202 and the second expandable stent 204 can be moved to different positions of the guide wire 102 to treat thrombi at different positions of the blood vessel.

[0051] In one embodiment, the first expansion stent 202 and the second expansion stent 204 both include a plurality of convex-shaped elastic members; the protruding portions of the elastic members extend axially toward the guide wire 102, and the plurality of elastic members are circumferentially connected end to end to form an expansion ring; the plurality of expansion rings are connected axially along the guide wire 102 to form the first expansion stent 202 or the second expansion stent 204; the axial length of the first expansion stent 202 is greater than the axial length of the second expansion stent 204.

[0052] The diameter of the first expansion bracket 202 when it is not deformed is larger than the outer diameter of the first sleeve 201, and the two ends of the first expansion bracket 202 are bent toward the axis of the first expansion bracket 202 and connected to the first sleeve 201; the diameter of the second expansion bracket 204 when it is not deformed is larger than the outer diameter of the second sleeve 203, and the two ends of the second expansion bracket 204 are bent toward the axis of the second expansion bracket 204 and connected to the second sleeve 203.

[0053] When the first expansion bracket 202 is located in the catheter 101, the first expansion bracket 202 is attached to the outer wall of the first sleeve 201, and the axial ends of the first expansion bracket 202 are pressed toward the middle of the first expansion bracket 202. The elastic member is pressed in both the axial and circumferential directions of the first expansion bracket 202, and the adjacent elastic members may be tilted and staggered, so that the overall outer profile of the first expansion bracket 202 shrinks. Similarly, the deformation pattern of the second expansion bracket 204 is similar to that of the first expansion bracket 202.

[0054] The two ends of the first expansion bracket 202 are respectively connected to the two axial ends of the first sleeve 201, and the two ends of the second expansion bracket 204 are respectively connected to the two axial ends of the second sleeve 203. The axial length of the first expansion bracket 202 is greater than the axial length of the second expansion bracket 204. Correspondingly, the axial length of the first sleeve 201 is greater than the axial length of the second sleeve 203.

[0055] In one embodiment, the tubing unit 100 further includes a Y-shaped valve 103 ; the Y-shaped valve 103 is disposed on the catheter 101 , and the guide wire 102 passes through the Y-shaped valve 103 and then enters the catheter 101 .

[0056] The Y-shaped valve 103 may include a Y-shaped connector, a guidewire torquer, and a guidewire cannula. During surgery, the Y-shaped connector is connected to the catheter 101, the guidewire cannula is inserted, the guidewire 102 is passed through the guidewire cannula and the guidewire torquer, the guidewire torquer is pushed, and the guidewire 102 is slowly pushed into the catheter 101.

[0057] Working process of interventional catheter assembly for cardiovascular and cerebrovascular care:

[0058] During the operation, the guide wire 102 is passed through the catheter 101, and the guide wire 102 is pushed first and then the catheter 101, so that the catheter 101 is advanced in the blood vessel. A radiopaque marking band is provided at the head end of the catheter 101. After the catheter 101 enters the blood vessel, other medical equipment can be used to emit radiation to the patient, and the radiation is reflected by the marking band of the catheter 101, thereby determining the position of the catheter 101 in the blood vessel. When the first expandable stent 202 and the second expandable stent 204 move to the thrombus, the catheter 101 is withdrawn. At this time, the first expandable stent 202 and the second expandable stent 204 separate from the catheter 101 and begin to expand and adhere to the thrombus. After complete adhesion, the guide wire 102 is withdrawn to pull the thrombus out of the blood vessel.

[0059] In a normal straight segment of a blood vessel, both the first expandable stent 202 and the second expandable stent 204 can fit the inner wall of the blood vessel.

[0060] When the first sleeve 201 and the second sleeve 203 pass through a curved blood vessel, the multiple mounting rings 301 in the first sleeve 201 are spread out along the guide wire 102, that is, the multiple mounting rings 301 abut against each other on the inner curved side of the guide wire 102, and gaps appear between the multiple mounting rings 301 on the outer curved side of the guide wire 102; the curved first sleeve 201 is elongated relative to the first sleeve 201 in a straight state, and the mounting ring b close to the second sleeve 203 drives the axial end of the first sleeve 201 away from the mounting ring a. At this time, the guide wire 102 in the first sleeve 201 is longer than the guide wire 102 in the first sleeve 201 in a straight state, so that the guide wire 102 in the first sleeve 201 is longer than that in the first sleeve 201 in a straight state. The guide wire 102 has a retraction effect. Since the axial end of the first sleeve 201 away from the second sleeve 203 and the axial end of the second sleeve 203 away from the first sleeve 201 are fixedly connected to the guide wire 102, no matter whether the number of the second sleeves 203 is one or two, the retraction of the guide wire 102 can drive the second sleeve 203 to axially contract toward the first sleeve 201, so that the second expandable stent 204 on the second sleeve 203 further expands to prevent the thrombus from escaping. In addition, the retraction of the guide wire 102 can drive the end of the second sleeve 203 away from the first sleeve 201 to deviate toward the outer bend of the blood vessel, so that the second expandable stent 204 is close to the blood vessel wall, further preventing the thrombus from escaping.

[0061] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An interventional catheter assembly for cardiovascular and cerebrovascular care, characterized in that: include: The tubular body unit comprises a catheter and a guide wire, wherein the guide wire passes through the catheter and both ends of the guide wire are located outside the catheter; the end of the catheter that first enters the blood vessel is the leading end; The expansion unit comprises a first sleeve, a first expansion bracket, at least one second sleeve and at least one second expansion bracket; the first sleeve and the second sleeve are both sleeved on the outside of the guide wire and located in the catheter; the first expansion bracket is arranged on the first sleeve and compressed in the catheter, and the second expansion bracket is arranged on the second sleeve and compressed in the catheter; the second sleeve abuts against the axial end of the first sleeve and at least one second sleeve is located on the side of the first sleeve close to the head end of the catheter; the first sleeve and the second sleeve both have the ability of elastic deformation; The support unit comprises a plurality of mounting rings sleeved outside the guide wire and located inside the first sleeve and the second sleeve; the mounting ring is a rigid member; a plurality of mounting rings are stacked inside the first sleeve and two mounting rings at two axial ends are fixedly connected to the first sleeve; one of the mounting rings other than the above two mounting rings inside the first sleeve is fixed to the guide wire; the mounting ring located inside the first sleeve and fixed to the guide wire is mounting ring a, the mounting rings located at two axial ends of the first sleeve are mounting ring b, and there is at least one mounting ring between the mounting ring a and the mounting ring b; two axial ends of the second sleeve are respectively fixedly connected to two mounting rings, and the mounting ring far away from the first sleeve is fixedly connected to the guide wire; The support unit further includes a plurality of long pins; the mounting ring is provided with a first mounting hole matched with the long pin, and the guide wire is provided with a second mounting hole matched with the long pin; the long pin radially penetrates the first sleeve or the second sleeve and matches with the first mounting hole and the second mounting hole, thereby fixing the mounting ring to the guide wire; The support unit also includes a plurality of short pins; the mounting ring is provided with a third mounting hole cooperating with the short pins; the short pins radially penetrate the first sleeve or the second sleeve and cooperate with the third mounting hole, thereby fixing the mounting ring to the first sleeve or the second sleeve.

2. The interventional catheter assembly for cardiovascular and cerebrovascular care according to claim 1, characterized in that: The number of the second sleeves is two and they are respectively located on two axial sides of the first sleeve; the mounting ring a is located at the axial midpoint of the first sleeve.

3. The interventional catheter assembly for cardiovascular and cerebrovascular care according to claim 1, characterized in that: The long pin and the short pin have the same diameter.

4. The interventional catheter assembly for cardiovascular and cerebrovascular care according to claim 1, characterized in that: The second mounting holes are multiple in number and arranged along the axial direction of the guide wire.

5. The interventional catheter assembly for cardiovascular and cerebrovascular care according to claim 1, characterized in that: The first expandable stent and the second expandable stent both include a plurality of convex-shaped elastic members; the protruding portions of the elastic members extend toward the axial direction of the guidewire, the plurality of elastic members are circumferentially connected end to end to form an expandable ring, and the plurality of expandable rings are connected along the axial direction of the guidewire to form the first expandable stent or the second expandable stent; the axial length of the first expandable stent is greater than the axial length of the second expandable stent.

6. The interventional catheter assembly for cardiovascular and cerebrovascular care according to claim 5, characterized in that: The diameter of the first expansion bracket when it is not deformed is larger than the outer diameter of the first sleeve, and the two ends of the first expansion bracket are bent toward the axis of the first expansion bracket and connected to the first sleeve; the diameter of the second expansion bracket when it is not deformed is larger than the outer diameter of the second sleeve, and the two ends of the second expansion bracket are bent toward the axis of the second expansion bracket and connected to the second sleeve.

7. The interventional catheter assembly for cardiovascular and cerebrovascular care according to claim 1, characterized in that: The tubular body unit further comprises a Y-shaped valve; the Y-shaped valve is arranged on the catheter, and the guide wire passes through the Y-shaped valve and then enters the catheter.

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