A split suction plug device

Abstract

The application discloses a detachable suction plug device, which comprises a suction plug head and a pushing structure. The suction plug head comprises a suction plug proximal end arranged near the end of the pushing structure and a suction plug distal end with radial expansion performance. The suction plug distal end is an elastic structure. The outer diameter of the suction plug distal end after radial expansion is larger than the diameter of the suction plug proximal end. After radial expansion, the suction plug head is funnel-shaped with the diameter gradually decreasing from the suction plug distal end to the suction plug proximal end. The distal end of the pushing structure is not fixedly connected with the suction plug proximal end or is connected with the suction plug proximal end through a releasable structure. The suction plug head is internally provided with a suction plug cavity which is arranged in the axial direction. The suction plug head can be matched with a common catheter to realize the function of sucking and taking out the plug. The suction plug head can be directly arranged at the distal end of the catheter, so as to be combined with the catheter as a suction device. The suction device can be directly sucked through the catheter, the use is limited, the catheter cavity is less occupied while having a larger diameter, and a larger suction plug efficiency can be realized.

Description

[0001] The present application is a divisional application of the patent application with application number 202211000478.5 and titled "Catheter with releasable head end", filed on August 19, 2022. TECHNICAL FIELD

[0002] The present application relates to the technical field of medical devices, in particular to the technical field of a split thrombus suction device. BACKGROUND

[0003] The current common mechanical thrombectomy auxiliary device includes a thrombectomy stent and a suction catheter. The common suction catheter is used for reperfusion after cooperating with a suction pump and a connecting pipe after thrombectomy or drug thrombolysis, or using the direct suction first pass technique (ADAPT) to directly apply mechanical suction to the reperfusion catheter for thrombectomy. In order to achieve the complete retrieval of the thrombus as much as possible, the blood vessel is completely interrupted, and the catheter has a large diameter and a large lumen, so that a high suction efficiency can be obtained.

[0004] The invention patent with the authorized announcement number CN107205751B discloses a blood thrombus removal device, which includes a delivery catheter, a self-expandable funnel and a suction funnel catheter. The device can use a larger mouth to suction the blood thrombus from a position very close to the blood thrombus, so that the artery is occluded and the flow is stopped, and the whole blood thrombus is suctioned without breaking the blood thrombus; however, the double-catheter structure sacrifices the inner diameter of the suction catheter to a certain extent, and the suction efficiency is lost.

[0005] The invention patent with the application publication number CN111867495A discloses a clot removal device, which includes an expandable treatment member and a delivery wire, and can also be applied to capture the thrombus in ischemic treatment, but it does not have a safe release / retrieval method to ensure that it is released at the correct position of the blood vessel. SUMMARY

[0006] The purpose of the present application is to solve the problems in the prior art, and to provide a split thrombus suction device which can cooperate with a catheter to directly suction the thrombus through the catheter and achieve a large suction efficiency.

[0007] In order to achieve the above-mentioned purpose, the present application provides a split thrombus suction device, which includes a thrombus suction head and a pushing structure. The thrombus suction head includes a thrombus proximal end arranged near the pushing structure end and a thrombus distal end having a radial expansion performance. The thrombus distal end is a flexible structure. The outer diameter of the thrombus distal end after radial expansion is larger than the diameter of the thrombus proximal end. After radial expansion of the thrombus head, the thrombus head is in the shape of a funnel with the diameter gradually decreasing from the thrombus distal end to the thrombus proximal end. The distal end of the pushing structure is not fixedly connected to the thrombus proximal end. A thrombus cavity is arranged in the thrombus head and extends in the axial direction.

[0008] As preferred, the push structure is a combination of one or more of the following: a push rod with bending performance, a spring, and a hypotube.

[0009] As preferred, the push structure further comprises a traction wire, the distal end of which is fixedly connected to the proximal end of the suction plug.

[0010] As preferred, the distal end of the push structure is provided with a stopper that is in abutting contact with the proximal end of the suction plug.

[0011] As preferred, the outer wall of the proximal end of the suction plug is provided with at least three outwardly protruding protrusions or is provided with an outwardly protruding protruding ring.

[0012] As preferred, the proximal end of the suction plug is provided with a first friction surface having a friction force greater than that of the rest of the outer surface of the suction plug head, the first friction surface being formed by coating, hot melting or surface treatment.

[0013] As preferred, the distal end of the push structure and / or the suction plug head is provided with a visualizing element.

[0014] As preferred, the proximal end of the suction plug has a tendency to gradually expand outwardly from the distal end to the proximal end.

[0015] As preferred, the suction plug head is a woven structure woven from metal wires, and the distal end surface of the suction plug is provided with a coating film.

[0016] As preferred, in a free state, the proximal end of the suction plug and the distal end of the suction plug have the same weaving angle.

[0017] The beneficial effects of the present application are as follows: The suction plug head of the present application can be combined with a conventional catheter to realize the function of suction and extraction, is more convenient to use, can be directly arranged at the distal end of the catheter to be used as a suction device in combination with the catheter, can be directly suctioned through the catheter without the need to additionally arrange a suction mechanism in the catheter, has less use restrictions, occupies less catheter lumen while having a larger diameter, can realize a larger suction efficiency, and the separation of the push structure and the suction plug head makes the push structure able to be withdrawn from the catheter after the push structure pushes the suction plug head, which is convenient for suction.

[0018] The features and advantages of the present application will be described in detail with reference to the embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a front view of the suction plug head and the push structure of the separation type suction plug device of the present application.

[0020] Figure 2 is a structure schematic view of the first embodiment of the separation type suction plug device of the present application in combination with a catheter.

[0021] Figure 3 is a structure schematic diagram of a release state of an embodiment one of a detachable plug device of the present application.

[0022] Figure 4 is Figure 1 is a structure schematic diagram of a section B-B in the above figure.

[0023] Figure 5 is a structure schematic diagram of a section of an embodiment two of a catheter with a releasable head end of the present application.

[0024] Figure 6 is a structure schematic diagram of an embodiment three of the present application with a releasable head end.

[0025] Figure 7 is a structure schematic diagram of an embodiment four of the present application with a releasable head end.

[0026] Figure 8 is a structure schematic diagram of an embodiment five of the present application with a releasable head end.

[0027] Figure 9 is a structure schematic diagram of an embodiment six of the present application with a releasable head end.

[0028] Figure 10 is a structure schematic diagram of an embodiment seven of the present application with a releasable head end.

[0029] In the figure: 1 - plug head, 2 - catheter, 3 - pushing structure, 101 - plug distal end, 102 - plug proximal end, 13 - convex point, 111 - sliding rail, 112 - sliding groove, 21 - stepped hole section, 211 - limit mechanism closing limit part, 212 - second friction surface, 301 - abutting block, 302 - pushing rod, 303 - traction wire, 1011 - first friction surface.

CONCRETE IMPLEMENTATIONS

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application is further described in detail below by means of the drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0031] In the description of the present application, it should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] In the description of the present application, it should be noted that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise explicitly specified and limited.

[0033] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Embodiment one:

[0035] Referring to Figure 1 , Figure 2 and Figure 3 , the present application is a separate suction device, which comprises a suction head 1 and a pushing structure 3. The suction head 1 comprises a suction proximal end 102 near the end of the pushing structure 3 and a suction distal end 101 with radial expansion performance. The suction distal end 101 is a flexible structure, and the outer diameter of the suction distal end 101 after radial expansion is greater than the diameter of the suction proximal end 102. After radial expansion, the suction head 1 is funnel-shaped with a diameter gradually decreasing from the suction distal end 101 to the suction proximal end 102. The distal end of the pushing structure 3 is not fixedly connected with the suction proximal end 102. The suction head 1 is provided with a suction cavity passing through the axial direction. In this embodiment, the suction head 1 can be matched with a common catheter 2 to realize the function of suction and extraction, and is more convenient to use. The suction head 1 can be directly arranged at the distal end of the catheter 2, so as to be combined with the catheter 2 as a suction device, and can be directly suctioned through the catheter 2 without another suction mechanism arranged in the catheter 2. The use is limited, and the catheter cavity is less occupied while having a larger diameter, which can realize a larger suction efficiency.

[0036] Refer to Figure 1 , Figure 2 and Figure 3 , the structure schematic diagram when the present embodiment cooperates with the catheter 2, the catheter 2 has a tube cavity arranged along its axial direction; the suction plug head 1 is axially slidably arranged in the distal end of the tube cavity, the suction plug distal end 101 is slidably arranged in the distal end of the tube cavity and can be kept in the tube cavity at all times, the pushing structure 3 is slidably arranged in the tube cavity, and the proximal end of the pushing structure 3 extends out of the catheter 2. In the present embodiment, the suction plug head 1 can cooperate with the ordinary catheter 2, the suction plug head 1 is arranged at the distal end of the catheter 2, the suction plug head 1 is slidably arranged in the distal end of the tube cavity, without the need for another pipeline to transport the suction plug head 1, the use is more convenient, a single catheter 2 can realize the transportation and release and recovery of the suction plug head 1, in the delivery state, the suction plug head 1 is accommodated in the distal end of the tube cavity, when delivered to a suitable position, the suction plug head 1 is pushed to the distal end direction by the pushing structure 3, until the suction plug distal end 101 is released to the outside of the tube cavity, the suction plug proximal end 102 is limited in the distal end of the tube cavity, the suction plug distal end 101 is radially self-expanded or expanded by auxiliary support such as traction / balloon, the pushing structure 3 can be separated from the suction plug head 1 and withdrawn from the catheter 2, so that the tube cavity can be directly used for cooperating with the suction plug head 1 to perform thrombus aspiration, and the tube cavity can also introduce various auxiliary thrombectomy devices.

[0037] Preferably, the pushing structure 3 is a pushing rod with bending performance. In the present embodiment, a pushing rod is selected as the pushing structure 3, the shape of the pushing rod is matched with the tube cavity, so that the pushing rod can slide along the tube cavity, and the suction plug proximal end 102 is facilitated to cooperate with the suction plug distal end 101 to push the suction plug distal end 101 to the outside of the tube cavity. In another optional embodiment, a spring or a hypotube can also be used as the pushing structure 3 in the present application, as long as the spring or the hypotube is arranged in a shape matched with the tube cavity so that the spring or the hypotube can slide along the tube cavity.

[0038] Embodiment two:

[0039] Refer to Figure 4 , Figure 5 , the distal end of the pushing structure 3 is provided with a resisting block 301 abutting against the suction plug proximal end 102. The resisting block 301 abuts against the suction plug head 1 to push the suction plug head 1, so that the distal end of the pushing structure 3 is not too soft to be pushed.

[0040] Refer to Figure 4 , Figure 5 , the outer wall of the suction plug proximal end 102 is provided with four outwardly protruding protrusions 13, so that the suction plug proximal end 102 can tightly abut against the inner wall of the tube cavity, the stability is improved, and the suction plug proximal end 102 is prevented from falling off.

[0041] Refer to Figure 4 , Figure 5The inner wall of the distal end of the tube lumen is provided with four sliding grooves 112 which are in sliding cooperation with the convex points 13. The sliding grooves 112 are closed at both ends. The convex points 13 are in cooperation with the closed sliding grooves 112 at both ends to limit the proximal end 102 of the suction plug, so as to avoid the proximal end 102 of the suction plug from being separated from the distal end of the tube lumen, thereby improving the safety.

[0042] Embodiment three:

[0043] Referring to Figure 6 The outer wall of the proximal end 102 of the suction plug is provided with a convex ring 14 which is outwardly convex. The distal end of the tube lumen of the corresponding catheter 2 is provided with a limiting mechanism closing limiting part 211 which has a diameter smaller than that of the convex ring 14 to prevent the proximal end 101 of the release head from being separated from the distal end of the tube lumen. The limiting mechanism closing limiting part 211 can be in cooperation with the outer ring of the convex ring 14 to limit the proximal end 101 of the release head in the tube lumen, so as to avoid the suction plug head 1 from being separated from the catheter 2.

[0044] Embodiment four:

[0045] Referring to Figure 7 The outer surface of the proximal end 102 of the suction plug is provided with a first friction surface 1011 which has a friction greater than that of the rest of the outer surface of the suction plug head 1. The first friction surface 1011 is formed by coating, hot melting or surface treatment. The distal end of the tube lumen is provided with a second friction surface 212 which is used to cooperate with the first friction surface 1011 to prevent the proximal end 102 of the suction plug from being separated from the tube lumen. Through the friction cooperation between the first friction surface 1011 and the second friction surface 212, a greater friction can be generated, so as to limit the proximal end 102 of the suction plug at the distal end of the tube lumen, thereby avoiding the separation of the proximal end 102 of the suction plug.

[0046] Preferably, the distal end of the pushing structure 3 and the suction plug head 1 are provided with a developing element. The position of the suction plug head 1 can be located through the developing element, so as to avoid the over-pushing or insufficient pushing of the releasable head end 1.

[0047] Embodiment five:

[0048] Referring to Figure 8 The proximal end 102 of the suction plug has a tendency to gradually expand outward from the distal end to the proximal end. When the proximal end 102 of the suction plug is in the catheter 2, it can be tightly attached to the inner wall of the catheter 2, so as to prevent the proximal end 102 of the suction plug from being separated from the catheter 2, and can improve the sealing between the proximal end 102 of the suction plug and the catheter 2, thereby improving the suction performance.

[0049] Embodiment six:

[0050] Referring to FIG. 9, the pushing structure 3 further includes a traction wire 303, and the distal end of the traction wire 303 is fixedly connected with the proximal end 102 of the suction plug. When the suction plug head 1 is in the release state and needs to be retrieved, the suction plug head 1 can be pulled back through the traction wire 303 until the suction plug head 1 is withdrawn into the tube lumen, thereby facilitating the withdrawal of the suction plug head 1.

[0051] Embodiment seven:

[0052] Referring to Figure 10 In the embodiment, the distal end of the pushing structure 3 is connected to the proximal end 102 of the suction plug through a releasable structure, which is a threaded connection. Specifically, the outer wall of the distal end of the pushing structure 3 and the inner wall of the proximal end 102 of the suction plug are respectively provided with threads that can be engaged with each other. During the pushing process of the pushing structure 3, the pushing structure 3 is kept in threaded connection with the proximal end 102 of the suction plug. After the pushing structure 3 is pushed into place, the pushing structure 3 can be separated from the proximal end 102 of the suction plug by rotating the pushing structure 3, thereby facilitating the extraction of the pushing structure 3 from the lumen of the tube.

[0053] Preferably, the suction plug head 1 is a woven structure woven from metal wires, and the surface of the distal end 101 of the suction plug is provided with a film.

[0054] Preferably, in the free state, the proximal end 102 and the distal end 101 of the suction plug have the same weaving angle, so that the suction plug head 1 as a whole has good flexibility and is more easily transported in a tortuous blood vessel.

[0055] The working process of the present application is as follows:

[0056] In the working process of the present application, the suction plug head 1 can be combined with the ordinary catheter 2. The suction plug head 1 is arranged at the distal end of the lumen of the catheter 2, the pushing structure 3 is slidably arranged in the lumen of the catheter 2, and the distal end of the pushing structure 3 is in contact with the proximal end 102 of the suction plug. In the delivery state, the suction plug head 1 is received at the distal end of the lumen of the catheter 2. When delivered to the appropriate position, the suction plug head 1 is pushed in the distal direction by the pushing structure 3 until the distal end 101 of the suction plug is released outside the lumen of the catheter, the proximal end 102 of the suction plug is limited to the distal end of the lumen of the catheter, and the distal end 101 of the suction plug is radially self-expanded or expanded by auxiliary support such as traction / balloon, so as to be in contact with the inner wall of the blood vessel to block the blood. The lumen of the catheter can also introduce various auxiliary thrombectomy devices.

[0057] The above embodiments are illustrative of the present application, but not limiting of the present application. Any simple transformation of the present application also falls within the scope of protection of the present application.

Claims

1. A split suction plug device comprising a suction plug head (1), a conduit (2) and a push structure (3), characterized in that: The suction plug head (1) comprises a suction plug proximal end (102) arranged near the end of the pushing structure (3) and a suction plug distal end (101) having radial expansion performance, the suction plug distal end (101) is a flexible structure, the outer diameter of the suction plug distal end (101) after radial expansion is larger than the diameter of the suction plug proximal end (102), and the suction plug head (1) after radial expansion is funnel-shaped with the diameter gradually decreasing from the suction plug distal end (101) to the suction plug proximal end (102), the distal end of the pushing structure (3) is not fixedly connected with the suction plug proximal end (102), the suction plug head (1) is provided with a suction plug cavity passing through the axial direction, the distal end of the pushing structure (3) is detachably connected with the suction plug proximal end (102) through a releasable structure, the releasable structure is a threaded connection, the outer wall of the distal end of the pushing structure (3) and the inner wall of the suction plug proximal end (102) are respectively provided with threads that are engaged with each other; the catheter (2) has a lumen arranged along the axial direction; the suction plug head (1) is arranged in the distal end of the lumen in a slidable manner, the suction plug distal end (101) is arranged in the distal end of the lumen in a slidable manner and can be kept in the lumen at all times, the pushing structure (3) is arranged in the lumen in a slidable manner, and the proximal end of the pushing structure (3) extends out of the lumen, the outer wall of the suction plug proximal end (102) is provided with four protrusions (13) arranged outwardly, the distal end of the lumen is provided with four sliding grooves (112) in sliding cooperation with the protrusions (13), the sliding grooves (112) are closed at both ends, the outer wall of the suction plug proximal end (102) is provided with a convex ring (14) arranged outwardly, and the distal end of the lumen of the catheter (2) is provided with a limiting mechanism closing portion (211) with a diameter smaller than that of the convex ring (14) to prevent the proximal end of the release head from being separated from the distal end of the lumen.

2. The breakaway sled-buckle assembly of claim 1, wherein: The pushing structure (3) is a combination of one or more of a pushing rod having bending performance, a spring, and a hypotube.

3. The breakaway sled-buckle assembly of claim 2, wherein: The pushing structure (3) further comprises a traction wire (303), and the distal end of the traction wire (303) is fixedly connected with the suction plug proximal end (102).

4. The breakaway sled-buckle assembly of claim 3, wherein: The distal end of the pushing structure (3) is provided with an abutting block (301) abutting against the suction plug proximal end (102).

5. The breakaway sled-buckle assembly of claim 1, wherein: The suction plug proximal end (102) has a tendency to expand outwardly from the distal end to the proximal end.

6. The breakaway sled-buckle assembly of claim 1, wherein: The suction plug head (1) is a woven structure woven by metal wires, and the surface of the suction plug distal end (101) is provided with a film.

7. A split-slug device as claimed in claim 6, characterized in that: In a free state, the suction plug proximal end (102) and the suction plug distal end (101) have the same weaving angle.

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