Quick exchange double-cavity micro catheter based on reverse guide wire

Abstract

The rear end of a rapid exchange cavity is a main branch guide wire inlet, the front end of the rapid exchange cavity is a main branch guide wire outlet, one side of the rapid exchange cavity is provided with a reverse guide wire cavity, the rear end of the reverse guide wire cavity is a reverse guide wire inlet, and the front end of the reverse guide wire cavity is a reverse guide wire outlet. The front end of the reverse guide wire cavity is located on the rear side of the front end of the rapid exchange cavity, the reverse guide wire is arranged in the reverse guide wire cavity, the main branch guide wire is arranged in the rapid exchange cavity, the attached side walls of the rapid exchange cavity and the reverse guide wire cavity extend backwards to form a pushing rod, the tail end of the pushing rod is an oval kneading part, and the front end of the reverse guide wire is pre-molded except the head end of the reverse guide wire. The pre-plasticized reverse guide wire has the advantages that the inner core of the guide wire is not easy to damage and fold, and the top end of the loop ring can form a V shape, so that the guide wire can pass through a lesion narrow part; and the quick exchange double-cavity microcatheter is provided with a push rod and can be removed.

Description

Technical Field

[0001] The present invention relates to the field of interventional instruments, in particular to a rapid exchange double-lumen microcatheter based on a reverse guidewire. Background Art

[0002] Currently, coronary intervention mainly refers to the opening of acute or chronic occluded coronary arteries, that is, the interventional guidewire passes through the occluded segment of the blood vessel into the distal vascular cavity of the occluded segment, and the expansion balloon enters the occluded segment along the guidewire to expand so as to restore blood flow in the diseased blood vessel; then a stent is implanted at the lesion to ultimately achieve the purpose of restoring unobstructed blood flow.

[0003] During coronary intervention, physicians often encounter the presence of branch vessels within the lesion. In some cases, such as severe stenosis with calcification or narrowing of the side branch ostium, stent implantation in the main branch inevitably leads to occlusion of the side branch due to compression by the stent / plaque. To prevent this, an interventional guidewire is often inserted through the side branch ostium to protect it.

[0004] In most cases, the branch opening is usually an anterograde opening, such as Figure 2 a. At this time, the guidewire can smoothly pass through the branch opening and enter the distal end of the branch. However, there are many cases of reverse opening of branch vessels, such as Figure 2 b. At this point, due to plaque or vascular crest obstruction at the branch opening, a standard forward guidewire cannot enter the branch. Once the catheter is in place, it cannot accommodate any balloon catheter. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to propose a rapid exchange double-lumen microcatheter based on a reverse guidewire.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A rapid exchange double-lumen microcatheter based on a reversal guidewire includes a rapid exchange lumen, an anti-guidewire lumen, a reversal guidewire and a main branch guidewire. The rear end of the rapid exchange lumen is the inlet of the main branch guidewire, and the front end of the rapid exchange lumen is the outlet of the main branch guidewire. An anti-guidewire lumen is provided on one side of the rapid exchange lumen. The rear end of the anti-guidewire lumen is the inlet of the reversal guidewire, and the front end of the anti-guidewire lumen is the outlet of the reversal guidewire. The front end of the anti-guidewire lumen is located on the rear side of the front end of the rapid exchange lumen. The reversal guidewire is arranged in the anti-guidewire lumen, and the main branch guidewire is arranged in the rapid exchange lumen. The fitted side walls of the rapid exchange lumen and the anti-guidewire lumen extend backward to form a pushing rod. The end of the pushing rod is an elliptical kneading part, and the front end of the reversal guidewire is pre-shaped except for the reversal guidewire head end.

[0007] Furthermore, the front end of the reverse guide wire forms a V-shaped reverse bend.

[0008] Furthermore, the rapid exchange lumen is linear; and the anti-guidewire lumen is linear.

[0009] Furthermore, the reverse guidewire outlet of the anti-guidewire cavity is arranged on a side wall of the anti-guidewire cavity, and the front end of the anti-guidewire cavity is a first arc-shaped guide surface.

[0010] Furthermore, a hollow portion that fits the shape of the reverse guidewire is provided on the side wall of the reverse guidewire cavity, and the hollow portion is larger than the diameter of the reverse guidewire.

[0011] Furthermore, a second arc-shaped guide surface is provided at the rear end of the reversing guide wire outlet, and the second arc-shaped guide surface protrudes from the reversing guide wire outlet.

[0012] Furthermore, the side wall of the reverse guidewire cavity and the second arc-shaped guide surface are provided with a hollow that fits the shape of the reverse guidewire, and the hollow is larger than the diameter of the reverse guidewire.

[0013] Furthermore, the front end of the reverse guide wire forms an inclined S-shaped reverse bend.

[0014] Furthermore, the rear side of the second arc-shaped guide surface is an arc, and the front end of the rapid exchange cavity and the anti-guidewire cavity are connected at an arc transition.

[0015] A method for rapidly exchanging a double-lumen microcatheter based on a reverse guidewire, comprising the following steps: after the guide catheter is in place, the main branch guidewire enters the target vessel, passes through the vascular lesion, and enters the distal end of the target vessel; Step 2: Use a rapid exchange double-lumen microcatheter pre-installed with a reverse guidewire, insert the main branch guidewire from the rear end into the rapid exchange lumen of the rapid exchange double-lumen microcatheter, and then advance the rapid exchange double-lumen microcatheter along the main branch guidewire into the target vessel; Step 3: Rapidly exchange the double-lumen microcatheter to reach the target vessel and reverse the guidewire to pass through the vascular lesion; Step 4: Operate to stabilize the main branch guidewire and reverse guidewire, and remove the rapid exchange double-lumen microcatheter through the push rod; Step 5: Slowly withdraw the reverse guide wire so that the tip of the reverse guide wire enters the side branch of the reverse opening.

[0016] The beneficial effects of the present invention are: first, the pre-shaped reversal guidewire: the inner core of the guidewire is not easily damaged, and the top of the loop can form a V shape, which is conducive to passing through the narrow part of the lesion; second, the rapid exchange double-lumen microcatheter: it has a push rod and can remove the rapid exchange double-lumen microcatheter; third, the setting of the first arc-shaped guide surface can continue to go deeper after the reversal guidewire enters the reverse opening or the side branch of the reverse S opening, and it is convenient to hollow out and separate the reversal guidewire and the reverse guidewire cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the rapid exchange double-lumen microcatheter in Example 1.

[0018] Figure 2 This is a diagram illustrating the background technology.

[0019] Figure 3This is a schematic diagram of the usage status flow structure of Example 1.

[0020] Figure 4 This is a cross-sectional view of the rapid exchange double-lumen microcatheter of Example 2.

[0021] Figure 5 Schematic diagram of the structure of the rapid exchange double-lumen microcatheter in Example 2.

[0022] Figure 6 It is a cross-sectional view of the guide groove in Examples 2 and 3.

[0023] Figure 7 Schematic diagram of the structure of the rapid exchange double-lumen microcatheter in Example 3.

[0024] Figure 8 This is a cross-sectional view of the rapid exchange double-lumen microcatheter of Example 3.

[0025] Figure 9 This is a schematic diagram of the reverse guidewire structure of Example 3.

[0026] 1 is the rapid exchange cavity; 2 is the reverse guidewire cavity; 3 is the reverse guidewire; 4 is the main branch guidewire; 5 is the V-shaped reverse bend; 6 is the reverse guidewire head; 7 is the push rod; 8 is the first arc-shaped guide surface; 9 is hollow; 10 is the second arc-shaped guide surface; 11 is the inclined S-shaped reverse bend; 12 is the elliptical kneading part; 13 is the guide groove. DETAILED DESCRIPTION

[0027] The following is a combination of the embodiments of the present invention Figure 1-9 , the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Example 1: Refer to the attached Figure 1-3 The rapid exchange double-lumen microcatheter based on the reversal guidewire includes a rapid exchange lumen 1, an anti-guidewire lumen 2, a reversal guidewire 3 and a main branch guidewire 4. The rear end of the rapid exchange lumen is the inlet of the main branch guidewire, and the front end of the rapid exchange lumen is the outlet of the main branch guidewire. An anti-guidewire lumen is provided on one side of the rapid exchange lumen, the rear end of the anti-guidewire lumen is the inlet of the reversal guidewire, and the front end of the anti-guidewire lumen is the outlet of the reversal guidewire. The front end of the anti-guidewire lumen is located on the rear side of the front end of the rapid exchange lumen, the reversal guidewire is arranged in the anti-guidewire lumen, and the main branch guidewire is arranged in the rapid exchange lumen.

[0029] A rapid exchange double-lumen microcatheter based on a reverse guidewire is provided, wherein a V-shaped reverse bend 5 is formed at the front end of the reverse guidewire, and the V-shaped reverse bend 5 is pre-shaped.

[0030] The rapid exchange double-lumen microcatheter based on the reversal guidewire has a pre-shaped front end except for the reversal guidewire tip 6.

[0031] The rapid exchange double-lumen microcatheter based on the reverse guidewire has the fitting side walls of the rapid exchange lumen and the reverse guidewire lumen extending backward to form a push rod, the end of the push rod is an elliptical kneading portion, and the push rod 7 is made of a hard material.

[0032] The rapid exchange double-lumen microcatheter based on the reverse guidewire has a linear rapid exchange lumen and a linear reverse guidewire lumen.

[0033] Rapid exchange double-lumen microcatheter based on reverse guidewire, pre-shaped reverse guidewire: the inner core of the guidewire is not easily damaged, and the top of the loop can form a V shape, which is conducive to passing through the narrow lesion.

[0034] Rapid exchange double-lumen microcatheter based on reverse guidewire, rapid exchange double-lumen microcatheter: with a push rod and can remove the rapid exchange double-lumen microcatheter.

[0035] A rapid-exchange double-lumen microcatheter based on a reverse guidewire is used. The reverse guidewire uses a 0.3g or 0.6g tip. The tip of the guidewire is pre-shaped into a V-shaped reverse bend.

[0036] The rapid exchange double-lumen microcatheter based on the reverse guidewire has a V-shaped loop with a width of 1.32±0.1mm at its widest point and a guidewire fold length of 20±1mm.

[0037] The V-shaped tip of the double-lumen microcatheter with rapid exchange based on the reverse guidewire facilitates the passage of the lesion at the reverse guidewire loop.

[0038] The rapid exchange double-lumen microcatheter based on the reverse guidewire does not have a pre-shaped guidewire tip, and the surgeon can further shape it using a shaping needle according to the vascular morphology.

[0039] The rapid-exchange double-lumen microcatheter, based on a reverse guidewire, is inserted into the rapid-exchange lumen during use. The catheter is then pushed along the main branch guidewire into the target vessel. The catheter can then carry the reverse guidewire into the target vessel, through the lesion, and to the distal end of the side branch.

[0040] A method for rapidly exchanging a double-lumen microcatheter based on a reverse guidewire, comprising the following steps: after the guide catheter is in place, the main branch guidewire enters the target vessel, passes through the vascular lesion, and enters the distal end of the target vessel; Step 2: Use a rapid exchange double-lumen microcatheter with a pre-installed reverse guidewire to insert the main branch guidewire from the rear end into the rapid exchange lumen of the rapid exchange double-lumen microcatheter, and then insert the rapid exchange double-lumen microcatheter along the main branch guidewire into the target vessel. Figure 3 a; Step 3: Rapidly exchange the double-lumen microcatheter to reach the target vessel, reverse the guidewire through the vascular lesion, and refer to Figure 3 b; Step 4: Operate to stabilize the main branch guidewire and reverse guidewire, and remove the rapid exchange double-lumen microcatheter through the push rod; Step 5: Slowly withdraw the reverse guide wire so that the tip of the reverse guide wire enters the side branch of the reverse opening.

[0041] The rapid exchange double-lumen microcatheter based on the reverse guidewire does not require manual shaping by the surgeon and can be used quickly after unpacking.

[0042] Based on the rapid exchange double-lumen microcatheter of the reverse guidewire, the pre-shaped reverse guidewire can pass through the lesion with the smallest reverse loop, avoiding the loop damaging the lesion and causing vascular dissection or aggravating vascular dissection.

[0043] The rapid exchange double-lumen microcatheter based on the reversal guidewire can ensure the rapid exchange lumen at the head end, and can push the rapid exchange double-lumen microcatheter along the main branch guidewire. At the same time, it also retains the shortened OTW lumen, which can accommodate the reversal guidewire inside. After the reversal guidewire is in place, the rapid exchange double-lumen microcatheter can be quickly removed.

[0044] The rapid exchange double-lumen microcatheter based on the reverse guidewire can greatly shorten the time of the reverse guidewire technology and simplify the operation process, while minimizing the damage to vascular lesions that cause dissection.

[0045] Example 2 Refer to the attached Figure 4-6 The rapid exchange double-lumen microcatheter based on the reverse guidewire includes a rapid exchange chamber, an anti-guidewire chamber, a reversal guidewire and a main branch guidewire. The rear end of the rapid exchange chamber is the inlet of the main branch guidewire, and the front end of the rapid exchange chamber is the outlet of the main branch guidewire. An anti-guidewire chamber is provided on one side of the rapid exchange chamber, and the rear end of the anti-guidewire chamber is the inlet of the reversal guidewire. The reversal guidewire outlet of the anti-guidewire chamber is arranged on one side wall of the anti-guidewire chamber, and the front end of the anti-guidewire chamber is a first arc-shaped guide surface; the front end of the anti-guidewire chamber is located at the rear side of the front end of the rapid exchange chamber, the reversal guidewire is arranged in the anti-guidewire chamber, and the main branch guidewire is arranged in the rapid exchange chamber, and the fitting side walls of the rapid exchange chamber and the anti-guidewire chamber extend backward to form a pushing rod, and the end of the pushing rod is an elliptical pinching part.

[0046] A rapid exchange double-lumen microcatheter based on a reverse guidewire is provided, wherein a V-shaped reverse bend 5 is formed at the front end of the reverse guidewire, and the V-shaped reverse bend 5 is pre-shaped.

[0047] A rapid exchange double-lumen microcatheter based on a reverse guidewire has a side wall of the reverse guidewire lumen provided with a hollow portion that fits the shape of the reverse guidewire, and the hollow portion is larger than the diameter of the reverse guidewire.

[0048] The rapid exchange double-lumen microcatheter based on the reverse guidewire has a first arc-shaped guide surface provided with a guide groove, and the V-shaped reverse bend of the reverse guidewire is located in the guide groove.

[0049] A rapid exchange double-lumen microcatheter based on a reverse guidewire has a sealed upper end of a guide groove, leaving an inlet and an outlet; and a hollow opening is provided on the side wall of the guide groove.

[0050] A method for rapidly exchanging a double-lumen microcatheter based on a reverse guidewire, comprising the following steps: after the guide catheter is in place, the main branch guidewire enters the target vessel, passes through the vascular lesion, and enters the distal end of the target vessel; Step 2: Use a rapid exchange double-lumen microcatheter pre-installed with a reverse guidewire, insert the main branch guidewire from the rear end into the rapid exchange lumen of the rapid exchange double-lumen microcatheter, and then advance the rapid exchange double-lumen microcatheter along the main branch guidewire into the target vessel; Step 3: Rapidly exchange the double-lumen microcatheter to reach the target vessel and reverse the guidewire to pass through the vascular lesion; Step 4: Withdraw the reverse guidewire and quickly exchange the double-lumen microcatheter so that the tip of the reverse guidewire enters the side branch of the reverse opening; Step 5: Operate the reverse guide wire forward, and make a V-shaped reverse bend through the first arc-shaped guide surface to allow the reverse guide wire to penetrate deeper; Step 6: After the reversal guidewire is in place, the rapid exchange double-lumen microcatheter is rotated by the push rod, and the reversal guidewire is separated from the rapid exchange double-lumen microcatheter through the hollowing; Step 7: Slowly withdraw and quickly exchange the double-lumen microcatheter.

[0051] Example 3 Refer to the attached Figure 6-9 The rapid exchange double-lumen microcatheter based on the reversal guidewire includes a rapid exchange chamber, an anti-guidewire chamber, a reversal guidewire and a main branch guidewire. The rear end of the rapid exchange chamber is the inlet of the main branch guidewire, and the front end of the rapid exchange chamber is the outlet of the main branch guidewire. An anti-guidewire chamber is provided on one side of the rapid exchange chamber, and the rear end of the anti-guidewire chamber is the inlet of the reversal guidewire. The reversal guidewire outlet of the anti-guidewire chamber is arranged on one side wall of the anti-guidewire chamber, and the front end of the anti-guidewire chamber is a first arc-shaped guide surface; the rear end of the reversal guidewire outlet is provided with a second arc-shaped guide surface, and the second arc-shaped guide surface protrudes from the reversal guidewire outlet; the front end of the anti-guidewire chamber is located at the rear side of the front end of the rapid exchange chamber, the reversal guidewire is arranged in the anti-guidewire chamber, and the main branch guidewire is arranged in the rapid exchange chamber, and the fitting side walls of the rapid exchange chamber and the anti-guidewire chamber extend backward to form a pushing rod, and the end of the pushing rod is an elliptical kneading part.

[0052] The rapid exchange double-lumen microcatheter based on the reverse guidewire has a hollow portion that fits the shape of the reverse guidewire on the side wall of the reverse guidewire cavity and the second arc-shaped guide surface, and the hollow portion is larger than the diameter of the reverse guidewire.

[0053] A rapid exchange double-lumen microcatheter based on a reverse guidewire is used, and the front end of the reverse guidewire forms an inclined S-shaped reverse bend.

[0054] The rapid exchange double-lumen microcatheter based on the reverse guidewire has a second curved guide surface with a rear side that is an arc, and the front end of the rapid exchange lumen and the reverse guidewire lumen are joined at an arc-shaped position.

[0055] A rapid exchange double-lumen microcatheter based on a reverse guidewire, wherein guide grooves are provided on both the first curved guide surface and the second curved guide surface, and the reverse guidewire is inclined in an S-shaped reverse bend and is located in the corresponding guide groove.

[0056] A rapid exchange double-lumen microcatheter based on a reverse guidewire has a sealed upper end of a guide groove, leaving an inlet and an outlet; and a hollow opening is provided on the side wall of the guide groove.

[0057] A method for rapidly exchanging a double-lumen microcatheter based on a reverse guidewire, comprising the following steps: after the guide catheter is in place, the main branch guidewire enters the target vessel, passes through the vascular lesion, and enters the distal end of the target vessel; Step 2: Use a rapid exchange double-lumen microcatheter pre-installed with a reverse guidewire, insert the main branch guidewire from the rear end into the rapid exchange lumen of the rapid exchange double-lumen microcatheter, and then advance the rapid exchange double-lumen microcatheter along the main branch guidewire into the target vessel; Step 3: Rapidly exchange the double-lumen microcatheter to reach the target vessel and reverse the guidewire to pass through the vascular lesion; Step 4: Retract the reverse guidewire and the rapid exchange double-lumen microcatheter, with the front end of the reverse guidewire lumen and the rear end of the second curved guide surface located in the opening of the reverse-opening S-shaped side branch; Step 5: Operate the reverse guide wire forward, and make a V-shaped reverse bend of the reverse guide wire to pass through the first arc-shaped guide surface and the second arc-shaped guide surface to make the reverse guide wire go deeper; Step 6: After the reverse guidewire is in place, the rapid exchange double-lumen microcatheter is pushed forward by the push rod. The front end of the reverse guidewire lumen and the rear end of the second curved guide surface are separated from the opening of the reverse-opening S-shaped side branch. Then, the rapid exchange double-lumen microcatheter is rotated by the push rod. The reverse guidewire is separated from the rapid exchange double-lumen microcatheter through the hollowing. Step 7: Slowly withdraw and quickly exchange the double-lumen microcatheter.

[0058] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A rapid exchange double-lumen microcatheter based on a reverse guidewire, comprising a rapid exchange lumen (1), a reverse guidewire lumen (2), a reverse guidewire (3) and a main branch guidewire (4), characterized in that: The rear end of the rapid exchange chamber (1) is the inlet of the main branch guidewire, the front end of the rapid exchange chamber (1) is the outlet of the main branch guidewire, and a reverse guidewire chamber (2) is provided on one side of the rapid exchange chamber (1). The rear end of the reverse guidewire chamber (2) is the inlet of the reverse guidewire, and the front end of the reverse guidewire chamber (2) is the outlet of the reverse guidewire. The front end of the reverse guidewire chamber (2) is located at the rear side of the front end of the rapid exchange chamber (1). The reverse guidewire (3) is arranged in the reverse guidewire chamber, and the main branch guidewire (4) is arranged in the rapid exchange chamber. The side walls of the rapid exchange chamber and the reverse guidewire chamber extend backward to form a push rod (7). The end of the push rod (7) is an elliptical kneading portion (12). The front end of the reverse guidewire is pre-shaped except for the reverse guidewire head end (6).

2. The rapid exchange double-lumen microcatheter based on a reverse guidewire according to claim 1, characterized in that: The tip of the guidewire is reversed to form a V-shaped bend (5).

3. The rapid exchange double-lumen microcatheter based on a reverse guidewire according to claim 2, characterized in that: The rapid exchange lumen is linear; the anti-guidewire lumen is linear.

4. The rapid exchange double-lumen microcatheter based on a reverse guidewire according to claim 1, characterized in that: The reverse guidewire outlet of the reverse guidewire cavity (2) is arranged on a side wall of the reverse guidewire cavity (2), and the front end of the reverse guidewire cavity (2) is a first arc-shaped guide surface (8).

5. The rapid exchange double-lumen microcatheter based on a reverse guidewire according to claim 4, characterized in that: A hollow (9) that fits the shape of the reverse guidewire is provided on the side wall of the reverse guidewire cavity (2), and the hollow is larger than the diameter of the reverse guidewire.

6. The rapid exchange double-lumen microcatheter based on a reverse guidewire according to claim 4, characterized in that: A second arc-shaped guide surface (10) is provided at the rear end of the reversing guide wire outlet, and the second arc-shaped guide surface protrudes from the reversing guide wire outlet.

7. The rapid exchange double-lumen microcatheter based on a reverse guidewire according to claim 6, characterized in that: The side wall of the reverse guidewire cavity (2) and the second arc-shaped guide surface are provided with a hollow (9) that fits the shape of the reverse guidewire, and the hollow is larger than the diameter of the reverse guidewire.

8. The rapid exchange double-lumen microcatheter based on a reverse guidewire according to claim 7, characterized in that: The tip of the inverted guidewire forms an oblique S-shaped reverse bend (11).

9. The rapid exchange double-lumen microcatheter based on a reverse guidewire according to claim 7, characterized in that: The rear side of the second arc-shaped guide surface is an arc, and the arc transition is formed at the joint of the front ends of the rapid exchange cavity and the anti-guidewire cavity.

10. A method for operating a rapid-exchange double-lumen microcatheter based on a reverse guidewire, characterized by: Step 1: After the guide catheter is in place, the main branch guidewire enters the target vessel, passes through the vascular lesion, and enters the distal end of the target vessel; Step 2: Use a rapid exchange double-lumen microcatheter pre-installed with a reverse guidewire, insert the main branch guidewire from the rear end into the rapid exchange lumen of the rapid exchange double-lumen microcatheter, and then advance the rapid exchange double-lumen microcatheter along the main branch guidewire into the target vessel; Step 3: Rapidly exchange the double-lumen microcatheter to reach the target vessel and reverse the guidewire to pass through the vascular lesion; Step 4: Operate to stabilize the main branch guidewire and reverse guidewire, and remove the rapid exchange double-lumen microcatheter through the push rod; Step 5: Slowly withdraw the reverse guide wire so that the tip of the reverse guide wire enters the side branch of the reverse opening.

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