A dual lumen suction catheter

Abstract

The utility model provides a kind of double-cavity suction catheter, it is related to medical instrument technical field, including double-cavity catheter, double-cavity catheter includes tube body, OTW cavity, RX cavity and developing mark, RX cavity is arranged in the side of tube body, OTW cavity includes proximal end cavity and distal end cavity, RX cavity is arranged in parallel with distal end cavity, proximal end cavity diameter is greater than the diameter of distal end cavity;By setting double-cavity catheter, including OTW cavity, RX cavity, in intracranial blood vessel tortuous part RX cavity can be inserted into a micro guide wire alone, can guide suction catheter to be conveyed to target position along blood vessel wall, can avoid "windowsill effect";While OTW cavity can also be inserted into a micro guide wire alone, synchronously assist suction catheter to be conveyed to target position, increase support force, solve the suction catheter in place difficult problem caused by "windowsill effect" and insufficient support force, and wherein the opening of RX cavity is arranged in side surface, cooperate the diameter change of OTW cavity, slow down the influence of RX cavity to suction, guarantee suction effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially a double -cavity suction catheter. BACKGROUND

[0002] Acute large blood vessel occlusive ischemic stroke refers to the ischemic stroke caused by the acute occlusion of the main cerebral blood vessels (such as the internal carotid artery, the middle cerebral artery, the vertebral artery or the basilar artery), which is a serious cerebrovascular disease. The pathogenesis of acute large blood vessel occlusive ischemic stroke is mainly embolism, about 15 million people worldwide suffer from stroke every year, of which ischemic stroke accounts for about 85% of all stroke cases; the incidence of ischemic stroke among residents over 40 years old in China in 2020 was 538.1 / 10 million, and the age-standardized incidence was 413.3 / 10 million. The incidence of ischemic stroke in China in 2016 was 276.75 / 10 million.

[0003] Suction thrombectomy has become a first-line treatment for the disease, which can significantly improve the recanalization rate and reduce the morbidity and mortality of patients. The steps of suction thrombectomy treatment technology are generally as follows: connecting a negative pressure device such as a syringe or a suction pump, directly extracting the thrombus in the blocked blood vessel by using a suction catheter, and achieving the purpose of restoring the patency of the blood vessel. Suction thrombectomy technology is increasingly used, but for patients with intracranial blood vessels tortuous, due to the "window sill effect" and insufficient support, the suction catheter is difficult to reach the target position smoothly, and there is a problem of difficult placement of the suction catheter. In view of the above defects, the present application is proposed.

[0004] Explanation of "window sill effect": during the intravascular interventional treatment operation, due to the large diameter difference between the catheter and the guide wire, a large gap exists between them, which makes the catheter tip easily stuck at the arterial opening when passing through the blood vessel branch or tortuous part, and it is difficult to pass smoothly. Utility model content

[0005] The utility model aims at providing a double -cavity suction catheter, adopts double -cavity design, solves the difficult placement of the suction catheter caused by "window sill effect" and insufficient support.

[0006] To solve the above problems, the utility model provides a kind of double-cavity suction catheter, including double-cavity catheter, the double-cavity catheter includes tube body, OTW cavity, RX cavity and developing mark, OTW cavity, RX cavity is used for OTW wire and RX wire to pass through respectively, realize synchronous assistance suction catheter delivery to target position, increase support force, the OTW cavity and RX cavity are all along tube body axial direction extension arrangement, wherein the OTW cavity penetrates tube body, the RX cavity is arranged in the side of tube body, the OTW cavity includes proximal end cavity and distal end cavity, the RX cavity is arranged in parallel with distal end cavity, the diameter of proximal end cavity is greater than the diameter of distal end cavity, for slowing down the influence of RX cavity to suction, guarantee suction effect, and the part position of distal end cavity longer than RX cavity has relatively thick pipe wall, improves the support of tube body, the developing mark includes RX developing mark and OTW developing mark, the RX developing mark is arranged at the position close to RX cavity distal end opening, the OTW developing mark is arranged at the position close to OTW cavity distal end opening.

[0007] According to an embodiment of the utility model, metal support structure is arranged in the tube body, the metal support structure is metal braided layer or a plurality of metal wires arranged along the circumference of the tube body and extending axially or a plurality of metal rings arranged axially along the tube body.

[0008] According to an embodiment of the utility model, the distal end cavity and the RX cavity are arranged in a non-centrosymmetric manner in the tube body.

[0009] Preferably, the distance from the center of the RX cavity to the center of the tube body is L6, the distance from the center of the distal end cavity to the center of the tube body is L5, and 5*L5=L6.

[0010] According to an embodiment of the utility model, the end of the tube body is provided with a wedge-shaped structure, the angle a of the inclined surface of the wedge-shaped structure is 10-80°, which facilitates the insertion of the catheter end into the blood vessel, reduces the friction between the catheter and the inner wall of the blood vessel, and reduces the resistance of the catheter to reach the position.

[0011] According to an embodiment of the utility model, the double-cavity suction catheter further comprises an OTW guide wire.

[0012] According to an embodiment of the utility model, the double-cavity suction catheter further comprises an RX guide wire.

[0013] According to an embodiment of the utility model, the distal end of the OTW guide wire and the RX guide wire is provided with a plastic part, the RX guide wire can freely slide in the RX cavity; the head end of the RX guide wire protrudes beyond the end of the RX cavity, the OTW guide wire can freely slide in the OTW cavity, the setting of the plastic part enables the head end of the guide wire to be plastic and to stably maintain the shape of plastic, which facilitates the adaptation to various irregular blood vessels.

[0014] Preferably, the RX guide wire and the OTW guide wire are made of the same material.

[0015] According to an embodiment of the utility model, the diameter of the transition position between the proximal cavity and the distal cavity gradually decreases.

[0016] According to an embodiment of the utility model, the diameter of the proximal cavity is greater than or equal to the diameter of the distal cavity plus the diameter of the RX cavity.

[0017] According to an embodiment of the utility model, the length of the RX cavity is greater than or equal to 30 cm.

[0018] Preferably, the length of the tube body 12 has a specific range of values: the length L1 of the tube body is within the range of 90-150 cm, and the distance L2 from the distal opening position of the RX cavity to the end of the tube body is within the range of 1 cm; the projection length of the inclined surface of the wedge-shaped structure is equal to the length from the distal end of the RX cavity to the end of the catheter, achieving adaptation to blood vessels of various irregular shapes.

[0019] The utility model discloses the beneficial effects are, through setting up double -cavity catheter, which contains OTW cavity, RX cavity, in the intracranial blood vessel tortuous part RX cavity can be inserted into a micro guide wire alone, can guide the suction catheter to be transported to the target position along the blood vessel wall, can avoid "window sill effect";Meanwhile, the OTW cavity can also be inserted into a micro guide wire alone, synchronously assist suction catheter to be transported to the target position, increase the supporting force, solve the suction catheter to be difficult to position due to "window sill effect" and the problem of insufficient supporting force, and wherein the opening of RX cavity is arranged on the side, and the diameter of OTW cavity changes, slows down the influence of RX cavity on suction, guarantees the suction effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model is further described below in combination with the drawings and examples.

[0021] Figure 1 It is whole structure schematic diagram of double -cavity suction catheter;

[0022] Figure 2 It is structure schematic diagram of double -cavity catheter;

[0023] Figure 3 It is size schematic diagram of double -cavity catheter;

[0024] Figure 4 It is Figure 3 It is the section view of double -cavity catheter L5 section in middle;

[0025] Figure 5 It is the section view of RX cavity section of double -cavity catheter;

[0026] Figure 6 It is the development diagram of the metal braided layer in the middle layer of double -cavity catheter;

[0027] Figure 7 It is the section view of double -cavity catheter with metal wire as metal support structure;

[0028] Figure 8 Fig. 2 is a schematic view of a metal support structure as a metal ring;

[0029] Figure 9 Fig. 3 is a schematic view of a distal end structure of a double-lumen catheter. DETAILED DESCRIPTION

[0030] The following description is merely illustrative in nature and is in no way intended to limit the scope of the application as defined in the appended claims. Furthermore, there is no intention that the examples represent an exhaustive list of possible implementations. The description set forth herein illustrates the preferred embodiment of the application, and it is not intended that the application be limited thereto as set forth in the following claims. The novel features of the application are set forth with particularity in the claims that follow.

[0031] Example 1

[0032] A double-lumen suction catheter, such as Figure 1 , comprises a double-lumen catheter 1, an OTW guide wire 3 and an RX guide wire 2.

[0033] As shown in Figure 2 , the double-lumen catheter 1 comprises a tube body 12, an OTW lumen 11, an RX lumen 13 and a radiographic marker.

[0034] The tube body 12 is made of PTFE, PU, Pebax, Nylon, TPU, TPE, HDPE single or mixed material, and a metal support structure 122 is embedded in the middle layer of the tube body 12. This design can increase the support force of the catheter, while maintaining the flexibility of the distal end.

[0035] Optionally, the metal support structure 122, as shown in Figures 6-8 , can be a metal braid layer or a plurality of metal wires arranged circumferentially along the tube body 12 or extending axially, or a plurality of metal rings arranged axially along the tube body 12.

[0036] As shown in Figure 9 , the end of the tube body 12 is provided with a wedge-shaped structure, and the angle a of the inclined surface of the wedge-shaped structure is 10-80°, which facilitates the insertion of the catheter end into the blood vessel, reduces the friction between the catheter and the inner wall of the blood vessel, and reduces the resistance of the catheter to reach the position.

[0037] As shown in Figure 4 , the outer diameter D1 of the tube body 12 is not less than 2.16 mm.

[0038] OTW cavity 11 and RX cavity 13 are used for OTW guidewire 3 and RX guidewire 2 to pass through, respectively, to achieve synchronous assistance in delivering the aspiration catheter to the target position and increase support. Both OTW cavity 11 and RX cavity 13 extend along the axial direction of the tube body 12. OTW cavity 11 penetrates the tube body 12, and RX cavity 13 is located on the side of the tube body 12. OTW cavity 11 includes a proximal cavity (L4 part) and a distal cavity. In this scheme, the distal end and proximal end refer to the insertion end and the operating end, respectively. RX cavity 13 is arranged side by side with the distal cavity. The diameter of the proximal cavity is larger than that of the distal cavity to reduce the influence of RX cavity 13 on aspiration and ensure aspiration effect. In addition, the part of the distal cavity that is longer than RX cavity 13 has a thicker tube wall to improve the support of the tube body 12.

[0039] In this embodiment, the diameter at the transition position between the proximal lumen and the distal lumen gradually decreases. In other embodiments, a sudden decrease can also be selected. The diameter d21 of the proximal lumen is greater than or equal to the diameter d22 of the distal lumen plus the diameter d3 of the RX lumen 13. The maximum size of the distal lumen diameter d22 is 0.072 inches, which makes the OTW lumen compatible with commercially available 5F / 6F catheters.

[0040] The diameter d3 of the RX cavity 13 is not less than 0.014 inches, which is compatible with the insertion of 0.014-inch guidewires.

[0041] The distal cavity and the RX cavity 13 are arranged non-centrally symmetrically within the tube body 12, making full use of the internal space of the tube body 12 while ensuring strength, such as Figure 5 The distance from the center of RX cavity 13 to the center of tube body 12 is L6, and the distance from the center of the distal cavity to the center of tube body 12 is L5. 5*L5=L6.

[0042] Preferably, such as Figure 3 The length of the tube body 12 has a specific range: the length L1 of the tube body 12 is in the range of 90~150cm, and the distance L2 from the distal opening of the RX lumen 13 to the end of the tube body is in the range of 1cm; the projected length of the wedge-shaped structure is equal to the length of the distal end of the RX lumen from the end of the catheter, and the length L3 of the RX lumen 13 is ≥30cm, so as to adapt to various irregularly shaped blood vessels.

[0043] Both OTW guidewire 3 and RX guidewire 2 have a shaping section at their distal ends, allowing the RX guidewire to slide freely within the RX lumen. The tip of the RX guidewire 2 extends beyond the end of the RX lumen 13, allowing the OTW guidewire to slide freely within the OTW lumen. The shaping section allows the guidewire tip to be shaped and to maintain its shaped form stably, making it easy to adapt to various irregular blood vessels.

[0044] Preferably, the RX guidewire and the OTW guidewire use the same material.

[0045] The imaging markers include RX imaging marker 14 and OTW imaging marker 15. RX imaging marker 14 is fixed at the distal end of RX lumen 11 on the outer surface of tube body 12, that is, it is set near the distal opening of RX lumen 13. OTW imaging marker 15 is fixed at the distal end of tube body 12, that is, it is set near the distal opening of OTW lumen 11. The position of the catheter is determined by imaging.

[0046] Instructions for using a double-lumen aspiration catheter:

[0047] Step 1: Before thrombus aspiration, the RX guidewire needs to be as close to the vessel wall as possible, passing through the occluded segment of the vessel;

[0048] Step 2: If the catheter's support is insufficient, insert an OTW guidewire to assist the catheter in reaching the target position, and then withdraw the OTW guidewire.

[0049] Step 3: Perform thrombus aspiration through the OTW lumen, keeping the RX guidewire in the RX lumen at all times;

[0050] Step 4: If thrombus aspiration is unsuccessful, repeat steps 1-3. The position of the catheter tip can be adjusted in real time to facilitate successful thrombus aspiration.

[0051] During the procedure, the position of the catheter in the blood vessel is determined in real time by using RX imaging markers and OTW imaging markers.

[0052] This double-lumen aspiration catheter can also be used for aspiration of venous sinus thrombosis.

[0053] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. A dual lumen suction catheter, characterized by: The device includes a double-lumen catheter (1), which includes a tube body (12), an OTW lumen (11), an RX lumen (13), and a contrast marker. The OTW lumen (11) and the RX lumen (13) both extend along the axial direction of the tube body (12). The OTW lumen (11) penetrates the tube body (12), and the RX lumen (13) is located on the side of the tube body (12). The OTW lumen (11) includes a proximal lumen and a distal lumen. The RX lumen (13) is arranged in parallel with the distal lumen. The diameter of the proximal lumen is larger than that of the distal lumen to mitigate the influence of the RX lumen (13) on aspiration and ensure aspiration effect. The contrast marker includes an RX contrast marker (14) and an OTW contrast marker (15). The RX contrast marker (14) is located near the distal opening of the RX lumen (13), and the OTW contrast marker (15) is located near the distal opening of the OTW lumen (11).

2. The dual lumen suction catheter of claim 1, wherein: The tube body (12) is provided with a metal support structure (122), which is a metal braided layer or a number of metal wires arranged circumferentially and extending axially along the tube body (12) or a number of metal rings arranged axially along the tube body (12).

3. The dual lumen suction catheter of claim 1 or 2, wherein: The distal cavity and the RX cavity (13) are arranged in a non-centrally symmetrical manner in the tube body (12).

4. The dual lumen suction catheter of claim 1 or 2, wherein: The end of the tube body (12) is provided with a wedge-shaped structure, and the slope angle of the wedge-shaped structure is 10~80°.

5. The dual lumen suction catheter of claim 1, wherein: The dual-lumen aspiration catheter also includes an OTW guidewire (3).

6. The dual lumen suction catheter of claim 5, wherein: The dual-lumen aspiration catheter also includes the RX guidewire (2).

7. The dual lumen suction catheter of claim 6, wherein: Both the distal ends of the OTW guidewire (3) and the RX guidewire (2) have shaping sections.

8. The dual lumen suction catheter of claim 1, wherein: The diameter gradually decreases at the transition point between the proximal and distal cavities.

9. The dual lumen suction catheter of claim 1, wherein: The diameter of the proximal cavity is ≥ the diameter of the distal cavity + the diameter of the RX cavity (13).

10. The dual lumen suction catheter of claim 1, wherein: The length of the RX cavity (13) is ≥30cm.

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