Foreign body baskets and medical devices for foreign body removal in minimally invasive surgery

Abstract

This invention discloses a foreign body basket and a medical device for foreign body removal in minimally invasive surgery, relating to the field of medical device technology. The foreign body basket includes: a fixing ring, multiple traction wires, and a woven mesh body; one end of each traction wire is connected to an open end of the woven mesh body, and the other end is connected to the fixing ring; the woven mesh body includes a first frustum mesh portion and a second frustum mesh portion, both in a double-frustum shape. A first bottom surface forms an open end, and the second and third bottom surfaces are connected and located on the same plane. The area of ​​the second bottom surface is larger than the area of ​​the third bottom surface. The second and third bottom surfaces are connected by a circular mesh portion, the plane of which is perpendicular to the axis of the woven mesh body, and a fourth bottom surface is a closed mesh surface. This invention improves the efficiency of foreign body retrieval while ensuring that it does not affect the flow of fluid within the body's cavities, thus improving the safety of the surgery.

Description

Technical Field

[0001] This invention relates to a medical device for minimally invasive surgery, and more particularly to a foreign body basket and a medical device for removing foreign bodies during minimally invasive surgery. Background Technology

[0002] Foreign bodies such as emboli or stones can accumulate in the body's cavities due to various reasons. The presence of these foreign bodies can damage organs or impair their function, making their removal crucial for health. Traditional treatment methods involved ultrasonic lithotripsy followed by natural expulsion, but the results were not ideal. Currently, with the development of interventional therapies and the increasing prevalence of minimally invasive surgery, foreign body baskets are widely used as commonly employed minimally invasive interventional devices.

[0003] Current foreign body baskets are used via minimally invasive techniques to retrieve foreign bodies, such as urinary tract stones, vascular thrombi, or stones in the bile duct or gallbladder. The typical structure of a foreign body basket is a mesh-like structure woven from metal wires. After the foreign body enters the mesh, it contracts and enters a delivery sheath, where it is eventually removed. Due to the size of the mesh, smaller foreign bodies can easily pass through and not be retrieved, a situation that needs to be avoided, especially in blood vessels. Conversely, a mesh that is too dense can impede the flow of bodily fluids or cause a foreign body reaction in the body.

[0004] Therefore, how to improve the efficiency of foreign object retrieval by the foreign object basket while ensuring that it does not affect the flow of fluid in the human body's cavities has become an urgent technical problem to be solved. 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 foreign body removal in minimally invasive surgery, which can effectively solve the technical problems existing in the background art.

[0006] In one aspect, the present invention provides a foreign object basket, comprising: a fixing ring, multiple traction wires, and a woven mesh body; one end of each of the multiple traction wires is connected to an open end of the woven mesh body, and the other end of each of the multiple traction wires is connected to the fixing ring; the woven mesh body includes a first frustum mesh portion and a second frustum mesh portion in the shape of double frustums, the first frustum mesh portion including a first bottom surface and a second bottom surface, and the second frustum mesh portion including 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 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 mesh portion, the plane in which the circular 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 diameter of the first frustum mesh portion is larger than the mesh diameter of the second frustum mesh portion.

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

[0009] Furthermore, the diameter of the traction wire is larger than the diameter of the threads in the woven mesh.

[0010] Furthermore, the area of ​​the annular mesh portion is 15-20% of the area of ​​the open end of the woven mesh body, and the area of ​​the annular mesh portion is 30-35% of the area of ​​the third bottom surface of the second frustum mesh portion.

[0011] Furthermore, the traction wires are 3 or 4.

[0012] Furthermore, under the action of the multiple traction wires, the woven mesh can retract into the delivery sheath.

[0013] Furthermore, one end of each of the multiple traction wires is evenly distributed at the open end of the woven mesh.

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

[0015] In another aspect, the present invention provides a medical device for foreign body removal during minimally invasive surgery, comprising a delivery sheath and the aforementioned foreign body basket. A medical device for foreign body removal during minimally invasive surgery includes a delivery sheath and the aforementioned foreign body basket.

[0016] The foreign body basket and medical device for foreign body removal in minimally invasive surgery provided by this invention can ensure that larger-sized foreign bodies can smoothly enter the basket. The first frustum mesh section with a larger mesh aperture ensures smooth flow of fluid within the lumen, while the high-density mesh of the annular mesh section can intercept the smallest-sized foreign bodies. The second frustum mesh section, with its mesh aperture between the first frustum mesh section and the annular mesh section, ensures that the foreign body basket can intercept and pick up foreign bodies of medium size. In addition, the annular mesh section is specially designed in terms of shape, angle, and area to ensure that even the smallest-sized foreign bodies within the tube can be sufficiently intercepted and picked up. Therefore, this invention improves the efficiency of foreign body basket retrieval and enhances the safety of interventional surgery. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1 This is a side view of the overall structure of a foreign object basket provided in one embodiment of this application;

[0019] Figure 2 An axial top view of a foreign object basket provided in one embodiment of this application;

[0020] Figure 3 This is a schematic diagram showing the release position of a foreign object basket provided in one embodiment of this application during use;

[0021] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0022] Figure 5 This is a schematic diagram illustrating a foreign object basket provided in one embodiment of the present application for capturing foreign objects during use;

[0023] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0024] Figure 7 A schematic diagram of a foreign object basket provided in one embodiment of this application after it is retracted into the sheath during use;

[0025] Figure 8 for Figure 7 A magnified view of a portion of the image. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention are also intended to include the plural forms unless the context clearly indicates otherwise.

[0028] 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, these acquisition modules should not be limited to these terms. These terms are only used to distinguish the acquisition modules from each other.

[0029] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0030] It should be noted that the directional terms such as "upper," "lower," "left," and "right" used in the embodiments of the present invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of the present invention. Furthermore, in the context, it should be understood that when it is mentioned that an element is formed "upper" or "lower" of another element, it can not only be formed directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element.

[0031] See Figure 1 One embodiment of this application provides a foreign object basket 100, including: a fixing ring 101, multiple traction wires 102, and a woven mesh body 103; one end of each traction wire 102 is connected to an open end 104 of the woven mesh body 103, and the other end of each traction wire 102 is connected to the fixing ring 101. The woven mesh body 103 includes a first frustum mesh portion 105 and a second frustum mesh portion 106 in a double frustum shape. The first frustum mesh portion 105 includes a first bottom surface 1051 and a second bottom surface 1052, and the second frustum mesh portion 106 includes a third bottom surface 1061 and a fourth bottom surface 1062. The first bottom surface 1051 forms an open end 104. The second bottom surface 1052 and the third bottom surface 1061 are connected and located on 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 mesh portion 107. The plane where the circular mesh portion 107 is located is perpendicular to the axis of the woven mesh body 103. The fourth bottom surface 1062 is a closed mesh surface.

[0032] See Figure 2The mesh density of the first frustum mesh portion 105 of the woven mesh body 103 is less than that of the second frustum mesh portion 106; in other words, the mesh aperture of the first frustum mesh portion 105 is larger than that of the second frustum mesh portion 106. When foreign objects such as stones or thrombi enter the woven mesh body 103, they will accumulate in the second frustum mesh portion 106. The accumulated stones or thrombi, combined with the fourth bottom 1062 of the second frustum mesh portion 106 with its larger mesh density, obstruct the flow of blood or urine in the urethra. However, the smaller weaving density of the first frustum mesh portion 105 ensures the flow of a considerable amount of blood or urine, preventing the aforementioned obstruction from affecting the normal functioning of the body. Although the mesh aperture of the first frustum mesh portion 105 is larger, it has the effect of guiding the entering stones or thrombi into the second frustum mesh portion 106, thus maximizing the collection of stones or thrombi.

[0033] The mesh density of the annular mesh portion 107 of the woven mesh body 103 is greater than that of the second frustum mesh portion 106. Therefore, when foreign objects such as stones or thrombi of various sizes enter the opening 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 stones or thrombi and stop them in the annular mesh portion 107, thereby preventing the smallest stones or thrombi from passing through the foreign object basket 100 through the interception of the second frustum mesh portion 106. This is particularly important when intercepting thrombi, because even the smallest thrombi, after passing through the foreign body basket 100, may enter very small blood vessels and cause new embolisms as blood flows, leading to more serious damage to the human body. When the aforementioned woven mesh 103 is retrieved from the foreign body basket 100, the aforementioned annular mesh portion 107 will deform and tilt, causing the smallest stones or thrombi to detach and enter the second frustum mesh portion 106. However, since a considerable number of various larger stones or thrombi have already accumulated in the second frustum mesh portion 106, it will actually hinder the escape of the smallest stones or thrombi. This can basically ensure that the smallest stones or thrombi are intercepted by the foreign body basket 100 and removed from the body's lumen or organs, thus maximizing the interception efficiency and the safety of interventional surgery.

[0034] It should be pointed out that, Figure 2 This is merely an axial top view of the foreign object basket 100. The mesh density, size, and proportion of each part are for reference only. The specific dimensions and relative relationships are subject to the textual description.

[0035] Another embodiment of this application provides a medical device for removing foreign bodies during minimally invasive surgery, including a delivery sheath 108 and the foreign body basket 100 mentioned in the above device embodiments.

[0036] Figures 3-8This diagram illustrates different stages of use of a foreign body basket 100 or a medical device for foreign body removal in minimally invasive surgery, as provided in another embodiment of this application. Although the present invention can be used in various similar lumens within the human body, such as blood vessels, urethra, bile ducts, gallbladder, and kidneys, Figures 3-8 The following is a demonstration of the procedure, using the removal of stones from the kidney as an example.

[0037] Specifically, in this embodiment, a foreign body basket 100 is released from the lumen of the kidney via a delivery sheath 108 that enters the kidney and is located near the stone 109. See details below. Figures 3-6 The stones 109 enter the opening of the braided mesh 103 between multiple traction wires 102. Due to the large gaps between the traction wires 102, stones 109 of various sizes that have been broken up by ultrasound are intercepted by the closed bottom of the aforementioned annular mesh portion 107 and the second frustum mesh portion 106. After the braided mesh 103 intercepts various stones 109, it contracts under the doctor's operation and enters the delivery sheath 108, where it can be removed from the body.

[0038] The foreign body basket 100 in this embodiment intercepts stones through mesh segments with different mesh densities, greatly improving its stone retrieval efficiency. The probability of small stones being missed in microvessels or lumens is greatly reduced, and the safety of the surgery is significantly improved.

[0039] 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 stones or thrombi and other foreign objects can smoothly enter the woven mesh 103.

[0040] Preferably, the diameter of the traction wire 102 is larger than the diameter of the braided metal wire of the braided mesh 103, thereby ensuring the elasticity and support deployment performance of the traction wire 102.

[0041] 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, in order to ensure the shape of the braided mesh 103 after it is unfolded.

[0042] 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 an excessive impact on the flow of fluid in the human body 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 frustum mesh portion 106. This size ensures that the annular mesh portion 107 intercepts as many small or smallest stones or thrombi as possible, thereby reducing the escape of foreign bodies such as stones or thrombi and maximizing the interception efficiency of the foreign body basket 100 for foreign bodies of various sizes, thereby significantly improving the safety of the operation.

[0043] The above description is merely 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 solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalent features without departing from the above-described concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the present invention.

Claims

1. A foreign body basket, characterized in that, The device comprises: a fixing ring, a plurality of traction wires and a braided mesh body; one end of the plurality of traction wires is connected to an open end of the braided mesh body, and the other end of the plurality of traction wires is connected to the fixing ring; the braided mesh body comprises a first frustoconical mesh part and a second frustoconical mesh part in the shape of double circular truncated cones, the first frustoconical mesh part comprises a first bottom surface and a second bottom surface, and the second frustoconical mesh part 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 in communication and located in the same plane, the area of the second bottom surface is larger than that of the third bottom surface, the second bottom surface and the third bottom surface are connected through a circular ring mesh part, the plane where the circular ring mesh part is located is perpendicular to the axis of the braided mesh body, and the fourth bottom surface is a closed mesh surface; the mesh aperture of the first frustoconical mesh part is larger than that of the second frustoconical mesh part; the mesh aperture of the circular ring mesh part is smaller than that of the second frustoconical mesh part; the area of the circular ring mesh part is 15-20% of the area of the open end of the braided mesh body, and the area of the circular ring mesh part is 30-35% of the area of the third bottom surface of the second frustoconical mesh part.

2. A foreign body basket according to claim 1, wherein, the diameter of the traction wire is larger than that of the wire of the braided mesh body.

3. The foreign body basket of claim 1, wherein, the traction wire is 3 or 4 in number.

4. The foreign body basket of claim 1, wherein, under the action of the plurality of traction wires, the braided mesh body can be contracted into a delivery sheath tube.

5. The foreign body basket of claim 1, wherein, one end of the plurality of traction wires is uniformly distributed in the open end of the braided mesh body.

6. A foreign body basket according to any one of claims 1-5, wherein, the braided mesh body and the traction wire are shape memory alloy wires.

7. A medical device for foreign body removal in minimally invasive surgery, characterized in that, the device comprises a delivery sheath tube and the foreign body mesh basket according to any one of claims 1-6.

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