Foreign matter mesh basket and medical device for taking out foreign matter in minimally invasive surgery

Abstract

The invention discloses a foreign body mesh basket and a medical device for taking out foreign bodies in minimally invasive surgery, and relates to the technical field of medical instruments. The foreign matter mesh basket comprises a fixing ring, a plurality of traction wires and a woven mesh body. One end of each traction wire is connected to the opening end of the woven mesh body, and the other end is connected with the fixing ring; the woven mesh body comprises a first circular-truncated-cone-shaped mesh part and a second circular-truncated-cone-shaped mesh part which are in a double-circular-truncated-cone shape, the first bottom face forms an opening end, the second bottom face and the third bottom face are communicated and located on the same plane, the area of the second bottom face is larger than that of the third bottom face, and the second bottom face and the third bottom face are connected through the circular-ring-shaped mesh part. The plane where the circular ring net-shaped part is located is perpendicular to the axis of the woven net body, and the fourth bottom face is a closed net-shaped face. The foreign matter picking efficiency of the foreign matter net basket is improved, meanwhile, it is guaranteed that flowing of liquid in the lumen of the human body is not affected, and the operation safety is improved.

Description

Technical Field

[0001] The invention relates to a medical instrument for minimally invasive surgery, in particular to a foreign body basket and a medical device for removing foreign bodies in minimally invasive surgery. Background Art

[0002] Due to various reasons, foreign bodies such as embolism or stones may appear in the lumen of the human body. The presence of foreign bodies can damage human organs or reduce organ function, so removing foreign bodies is very important for human health. In the past, the traditional treatment method was to use ultrasonic stones to crush the stones, and then the body would naturally excrete them, but the effect was not ideal. At present, with the development of interventional treatment methods, the popularity of minimally invasive surgery is increasing, and foreign body baskets are also widely used as common minimally invasive interventional treatment devices.

[0003] The current foreign body basket is used to enter the human body through minimally invasive surgery to pick up foreign bodies, such as stones in the urinary system or blood clots in the vascular system, or stones in the bile duct or gallbladder. The foreign body basket is usually a wire mesh bag structure. After the foreign body enters the net bag, it shrinks and enters the delivery sheath tube, and is finally taken out. Due to the size of the mesh of the net bag, smaller foreign bodies are easy to pass through the net bag and not be picked up. This situation needs to be avoided in blood vessels, and the mesh of the net bag is too dense, which will affect the flow of body fluids or produce foreign body reactions in the human body.

[0004] Therefore, how to improve the efficiency of the foreign body basket in picking up foreign objects while ensuring that the flow of liquid in the human body lumen is not affected has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, the present invention provides a foreign body basket and a medical device for removing foreign bodies in minimally invasive surgery, which can effectively solve the technical problems existing in the background technology.

[0006] One aspect of the present invention provides a foreign body net basket, comprising: a fixing ring, a plurality of traction wires and a woven mesh body; one end of the plurality of traction wires is connected to the open end of the woven mesh body, and the other ends of the plurality of traction wires are connected to the fixing ring; the woven mesh body comprises a first truncated cone mesh portion and a second truncated cone mesh portion in the shape of a double truncated cone, the first truncated cone mesh portion comprises a first bottom surface and a second bottom surface, the second truncated cone mesh portion comprises a third bottom surface and a fourth bottom surface; wherein the first bottom surface constitutes the open end, the second bottom surface and the third bottom surface are connected and are located in the same plane, the area of ​​the second bottom surface is larger than the area of ​​the third bottom surface, the second bottom surface and the third bottom surface are connected by a circular ring mesh portion, the plane where the circular ring mesh portion is located is perpendicular to the axis of the woven mesh body, and the fourth bottom surface is a closed mesh surface.

[0007] Furthermore, the mesh aperture of the first frustum-cone mesh portion is larger than the mesh aperture of the second frustum-cone mesh portion.

[0008] Furthermore, the mesh aperture of the annular mesh portion is smaller than the mesh aperture of the second frustum cone mesh portion.

[0009] Furthermore, the diameter of the traction wire is greater than the diameter of the wire used to weave the mesh.

[0010] Furthermore, the area of ​​the circular ring mesh portion is 15-20% of the area of ​​the opening end of the woven mesh body, and the area of ​​the circular ring mesh portion is 30-35% of the area of ​​the third bottom surface of the second truncated cone mesh portion.

[0011] Furthermore, the number of the traction wires is 3 or 4.

[0012] Furthermore, under the action of the multiple traction wires, the braided mesh can be retracted into the delivery sheath.

[0013] Furthermore, one ends of the multiple traction wires are evenly distributed at the open end of the braided mesh body.

[0014] Furthermore, the braided mesh and the traction wire are shape memory alloy wires.

[0015] Another aspect of the present invention provides a medical device for removing foreign bodies in minimally invasive surgery, comprising a delivery sheath and the above-mentioned foreign body basket. A medical device for removing foreign bodies in minimally invasive surgery, comprising a delivery sheath and the above-mentioned foreign body basket.

[0016] The foreign body net basket and the medical device for removing foreign bodies in minimally invasive surgery provided by the present invention can ensure that foreign bodies of larger sizes can enter the blocking net smoothly, the first truncated cone mesh part with a larger mesh aperture can ensure the smooth flow of liquid in the lumen, and at the same time, the high-density mesh of the annular mesh part can intercept foreign bodies of the smallest size, and the mesh aperture of the second truncated cone mesh part between the first truncated cone mesh part and the annular mesh part can ensure that the foreign body net basket intercepts and picks up foreign bodies of intermediate sizes; in addition, the annular mesh part is specially designed in shape, angle and area size, which can ensure that foreign bodies of the smallest size in the tube body can be relatively fully intercepted and picked up. Based on this, the present invention improves the efficiency of foreign body net basket in picking up foreign bodies and improves the safety of interventional surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A side view of the overall structure of a foreign body basket provided in one embodiment of the present application; Figure 2An axial top view of a foreign body basket provided in one embodiment of the present application; Figure 3 A schematic diagram of the release position of the foreign body basket provided by one embodiment of the present application when in use; Figure 4 for Figure 3 A partial enlarged view of Figure 5 A schematic diagram of a foreign body basket provided by an embodiment of the present application for capturing foreign bodies when in use; Figure 6 for Figure 5 A partial enlarged view of Figure 7 A schematic diagram of a foreign body basket provided by an embodiment of the present application that is retracted behind the sheath when in use; Figure 8 for Figure 7 A partial enlarged view of . DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention are also intended to include plural forms, unless the context clearly indicates other meanings.

[0020] It should be understood that although the terms first, second, third, etc. may be used to describe the acquisition modules in the embodiments of the present invention, the acquisition modules should not be limited to these terms. These terms are only used to distinguish the acquisition modules from each other.

[0021] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0022] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present invention are described at the angles shown in the drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is formed "on" or "under" another element, it can not only be formed directly "on" or "under" another element, but also be formed "on" or "under" another element indirectly through an intermediate element.

[0023] See also Figure 1 One embodiment of the present application provides a foreign body net basket 100, comprising: a fixing ring 101, a plurality of traction wires 102 and a braided net body 103; one end of the plurality of traction wires 102 is connected to an open end 104 of the braided net body 103, and the other end of each traction wire 102 is connected to the fixing ring 101. The braided net body 103 comprises a first truncated cone mesh portion 105 and a second truncated cone mesh portion 106 in a double truncated cone shape, the first truncated cone mesh portion 105 comprises a first bottom surface 1051 and a second bottom surface 1052, and the second truncated cone mesh portion 106 comprises a third bottom surface 1061 and a fourth bottom surface 1062. Among them, the first bottom surface 1051 constitutes an open end 104, the second bottom surface 1052 and the third bottom surface 1061 are connected and located in the same plane, the area of ​​the second bottom surface 1052 is larger than the area of ​​the third bottom surface 1061, the second bottom surface 1052 and the third bottom surface 1061 are connected by a circular ring mesh portion 107, the plane where the circular ring mesh portion 107 is located is perpendicular to the axis of the woven mesh body 103, and the fourth bottom surface 1062 is a closed mesh surface.

[0024] See also Figure 2 , the mesh density of the first truncated cone mesh part 105 of the braided mesh body 103 is less than the mesh density of the second truncated cone mesh part 106, in other words, the mesh aperture of the first truncated cone mesh part 105 is greater than the mesh aperture of the second truncated cone mesh part 106. When foreign matter such as calculi or thrombi enter the braided mesh body 103, they will be collected in the second truncated cone mesh part 106. The collected calculi or thrombi will combine with the fourth bottom 1062 of the second truncated cone mesh part 106 with a larger mesh density to produce flow obstruction to the blood or urine in the urethra, but the smaller braiding density of the first truncated cone mesh part 105 can ensure the flow of a considerable amount of blood or urine, avoiding the above-mentioned obstruction from affecting the normal operation of human body functions. Although the mesh aperture of the first truncated cone mesh part 105 is larger, it can introduce the entered calculi or thrombi into the second truncated cone mesh part 106, so the maximum amount of calculi or thrombi can be collected.

[0025] The mesh density of the annular mesh portion 107 of the woven mesh body 103 is greater than the mesh density of the second conical mesh portion 106. Therefore, when foreign objects such as stones or thrombi of various sizes enter the open end 104 of the woven mesh body 103, the annular mesh portion 107 with the largest mesh density can intercept a considerable portion of the smallest-sized stones or thrombi and make them stagnate in the annular mesh portion 107, thereby preventing the smallest-sized stones or thrombi from being intercepted by the second conical mesh portion 106 and passing through the foreign object basket 100. This is particularly important when intercepting thrombus blocks, because after the smallest sized thrombus blocks pass through the interception of the foreign body basket 100, they may enter very fine blood vessels with the flow of blood and cause new embolism, resulting in more serious damage to the human body. When the foreign body basket 100 is recovered, the aforementioned annular mesh portion 107 of the woven mesh body 103 will be deformed and tilted, causing the smallest sized stones or thrombus blocks to detach and enter the second truncated cone mesh portion 106. However, since a considerable amount of various larger sized stones or thrombus blocks have been collected in the second truncated cone mesh portion 106, the escape of the smallest sized stones or thrombus blocks will be substantially hindered, which can basically ensure that the smallest sized stones or thrombus blocks are intercepted by the foreign body basket 100 and removed from the human body's lumen or organs, thereby maximizing the interception efficiency and the safety of the interventional surgery.

[0026] It should be pointed out that Figure 2 It is only an axial top view of the foreign body basket 100. The mesh density, size and proportion of each part are for reference only. The specific size and relative relationship shall be subject to the text description.

[0027] Another embodiment of the present application further provides a medical device for removing foreign bodies in minimally invasive surgery, including a delivery sheath 108 and the foreign body basket 100 mentioned in the above device embodiment.

[0028] Figures 3~8 Schematic diagram of a foreign body basket 100 or a medical device for removing foreign bodies in minimally invasive surgery provided by another embodiment of the present application at different stages of use. Although the present invention can be used in different similar lumens of the human body, such as blood vessels, urethra, bile duct, gallbladder and kidney, Figures 3~8 The use process is illustrated by taking the removal of stones from the kidney as an example.

[0029] Specifically, in this embodiment, the delivery sheath 108 enters the lumen of the human kidney and releases the foreign body basket 100 near the stone 109. For details, see Figure 3~Figure 6The stones 109 enter the opening of the braided mesh 103 from between the multiple traction wires 102. Since the gaps between the traction wires 102 are large, the stones 109 of various sizes that have been broken by ultrasound are intercepted by the closed bottom of the annular mesh part 107 and the tail end of the second truncated cone mesh part 106. After the braided mesh 103 intercepts various stones 109, it shrinks into the delivery sheath 108 under the operation of the doctor and can be removed from the human body.

[0030] The foreign body basket 100 of this embodiment intercepts stones through mesh sections with different mesh densities, which greatly improves the efficiency of picking up stones, greatly reduces the probability of small-sized stones being missed in microvessels or lumens, and significantly improves the safety of surgery.

[0031] Preferably, there are three or four traction wires 102 . Fewer traction wires 102 can ensure that the width between two adjacent traction wires 102 is large enough, thereby ensuring that larger foreign bodies such as stones or thrombi can enter the woven mesh 103 smoothly.

[0032] Preferably, the diameter of the traction wire 102 is greater than the diameter of the braided metal wire of the braided mesh body 103 , thereby ensuring the elasticity and support and deployment performance of the traction wire 102 .

[0033] Preferably, the metal braiding wires of the traction wire 102 and the braided mesh 103 are both shape memory alloy wires that meet national medical standards to ensure the shape of the braided mesh 103 after it is unfolded.

[0034] More preferably, the area of ​​the annular mesh portion 107 is 15% to 20% of the opening area of ​​the woven mesh body 103. This size ensures that the annular mesh portion 107 with the maximum mesh density will not have too much impact on the flow of liquid in the human lumen; at the same time, the area of ​​the annular mesh portion 107 is 30% to 35% of the maximum area of ​​the front port (equivalent to the third bottom surface 1061) of the second truncated cone mesh portion 106. This size can ensure that the annular mesh portion 107 intercepts as many smaller or smallest-sized stones or thrombi as possible, so as to reduce the escape of foreign bodies such as the above-mentioned stones or thrombi, and maximize the interception efficiency of the foreign body basket 100 for foreign bodies of various sizes, thereby significantly improving the safety of the operation.

[0035] The above description is only a preferred embodiment of the present invention. Those skilled in the art should understand that the scope of disclosure involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but also should cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. A foreign body basket, characterized in that: include: A fixing ring, a plurality of traction wires and a braided mesh body; One end of the plurality of traction wires is connected to the open end of the braided mesh body, and the other ends of the plurality of traction wires are connected to the fixing ring; The woven mesh body includes a first truncated cone mesh portion and a second truncated cone mesh portion in a double truncated cone shape, the first truncated cone mesh portion includes a first bottom surface and a second bottom surface, the second truncated cone mesh portion includes a third bottom surface and a fourth bottom surface; wherein the first bottom surface constitutes the opening end, the second bottom surface and the third bottom surface are connected and located in the same plane, the area of ​​the second bottom surface is greater than the area of ​​the third bottom surface, the second bottom surface and the third bottom surface are connected by a circular ring mesh portion, the plane where the circular ring mesh portion is located is perpendicular to the axis of the woven mesh body, and the fourth bottom surface is a closed mesh surface.

2. A foreign body basket according to claim 1, characterized in that: The mesh aperture of the first truncated cone mesh portion is larger than the mesh aperture of the second truncated cone mesh portion.

3. A foreign body basket according to claim 2, characterized in that: The mesh aperture of the annular mesh portion is smaller than the mesh aperture of the second frustum cone mesh portion.

4. A foreign body basket according to claim 1, characterized in that: The diameter of the traction wire is greater than the diameter of the wire used to weave the mesh.

5. The foreign body basket according to claim 1, characterized in that: The area of ​​the circular ring mesh portion is 15-20% of the area of ​​the opening end of the woven mesh body, and the area of ​​the circular ring mesh portion is 30-35% of the area of ​​the third bottom surface of the second truncated cone mesh portion.

6. A foreign body basket according to claim 1, characterized in that: The number of the traction wires is 3 or 4.

7. The foreign body basket according to claim 1, characterized in that: Under the action of the multiple traction wires, the braided mesh can be retracted into the delivery sheath.

8. The foreign body basket according to claim 1, characterized in that: One ends of the plurality of traction wires are evenly distributed at the open end of the braided mesh body.

9. A foreign body basket according to any one of claims 1 to 8, characterized in that: The braided mesh body and the traction wire are shape memory alloy wires.

10. A medical device for removing foreign bodies in minimally invasive surgery, characterized in that: It comprises a delivery sheath and a foreign body basket as described in any one of claims 1-9.

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