A medical kit

Abstract

The application provides a medical kit, which comprises a first catheter and an anchoring mechanism; the first catheter is used for guiding the anchoring mechanism to a target position; the anchoring mechanism comprises a second catheter, a pushing rod and a support; the second catheter is used for being partially arranged in a lumen of the first catheter; the pushing rod is partially arranged in a lumen of the second catheter and can axially move relative to the second catheter; a distal end of the pushing rod is connected with a proximal end of the support; and the support is a self-expanding structure. The medical kit can be used for PCI operation and can simply and quickly anchor a guide wire, so that the operation time is shortened.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to a medical kit. Background Technology

[0002] Percutaneous coronary intervention (PCI) is mainly used to treat obstructive coronary artery disease. It has developed rapidly due to its advantages of being minimally invasive, time-saving, safe, and efficient.

[0003] As the complexity of lesions increases, multiple interventional instruments are typically required in a single PCI procedure. In practice, these instruments are guided to the lesion site via the same guidewire. During the exchange of different instruments, if the friction between the guidewire and the instrument is high, the guidewire may shift, preventing accurate guidance of the instrument to the lesion site. This can lead to prolonged procedure time or reduced treatment effectiveness.

[0004] Anchoring balloons can be used in PCI procedures to address the aforementioned issues. In use, the anchoring balloon is placed within the guiding catheter, with the guidewire partially inserted through it. The guidewire is positioned by inflating the balloon and pressing it against it. This method requires the introduction of devices such as Luer connectors to inflate or aspirate the anchoring balloon, increasing the surgeon's workload and prolonging the procedure time. Summary of the Invention

[0005] The purpose of this invention is to provide a medical kit designed to quickly anchor the guidewire during PCI surgery, thereby shortening the operation time.

[0006] To achieve the above objectives, the present invention provides a medical kit including a first catheter and an anchoring mechanism; the first catheter is used to guide the anchoring mechanism to a target position; the anchoring mechanism includes a second catheter, a push rod, and a support, the second catheter being partially disposed within the lumen of the first catheter, the push rod being partially inserted within the lumen of the second catheter and capable of axial relative movement with the second catheter, the distal end of the push rod being connected to the proximal end of the support, and the support being a self-expanding structural member.

[0007] Optionally, a friction-enhancing structure is formed on the outer peripheral surface of the bracket, and the projection of the friction-enhancing structure on a plane perpendicular to the axial direction of the bracket is a closed ring.

[0008] Optionally, the support includes a bare metal support with an uneven structure formed on its outer peripheral surface; the friction-enhancing structure includes the uneven structure.

[0009] Optionally, the concave-convex structure includes a concave bottom and a peak, the height difference between the peak and the concave bottom being Δh; the support further includes a protective structure, the protective structure being attached to the concave-convex structure, and the projection of the protective structure onto a plane perpendicular to the axial direction of the support being a closed ring, the hardness of the protective structure being less than a preset value; the thickness of the protective structure at the concave bottom is d1, the thickness of the protective structure at the peak is d2, and d1, d2, and Δh satisfy: d1 < d2 + Δh; the friction-enhancing structure includes the concave-convex structure and the protective structure.

[0010] Optionally, the protective structure includes an elastic membrane.

[0011] Optionally, the protective structure is a coating.

[0012] Optionally, the support includes a bare metal support and the friction-enhancing structure, wherein the outer peripheral surface of the bare metal support is smooth; the friction-enhancing structure is attached to at least a portion of the outer peripheral surface of the bare metal support; and the friction coefficient of the outer surface of the friction-enhancing structure is greater than the friction coefficient of the outer peripheral surface of the bare metal support.

[0013] Optionally, the friction-enhancing structure includes an elastic membrane.

[0014] Optionally, the friction-enhancing structure includes a lubricating coating, and the outer surface of the lubricating coating is uneven.

[0015] Optionally, the anchoring mechanism further includes a developing element disposed on the support.

[0016] Compared with the prior art, the medical kit of the present invention has the following advantages:

[0017] The aforementioned medical kit includes a first catheter and an anchoring mechanism; the first catheter guides the anchoring mechanism to a target position; the anchoring mechanism includes a second catheter, a push rod, and a support; the second catheter is partially inserted into the lumen of the first catheter, the push rod is partially disposed within the lumen of the second catheter and is capable of axial relative movement with respect to the second catheter, the distal end of the push rod is connected to the proximal end of the support, and the support is a self-expanding structure; the medical kit is configured such that the support retracts into the lumen of the second catheter and contracts radially, or extends from the distal end of the second catheter and expands radially, due to the axial relative movement of the push rod with respect to the second catheter. The medical kit can be used in PCI surgery. During operation, by extending the support from the distal end of the second catheter and expanding radially, it can press against the guidewire inserted into the lumen of the first catheter to provide anchoring force to the guidewire, reducing or even preventing guidewire displacement. This guidewire anchoring method eliminates the need for a balloon and thus the need for balloon infusion, which can shorten the operation time and eliminate the need for additional infusion devices such as Luer connectors, reducing consumable usage and lowering economic costs.

[0018] A friction-enhancing structure is formed on the outer peripheral surface of the support to increase the interaction force between the support and the guide wire, thereby improving the anchoring ability of the support for the guide wire. Attached Figure Description

[0019] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein:

[0020] Figure 1 This is a schematic diagram of an application scenario of the medical kit provided by the present invention according to an embodiment, in which the stent is in a radially expanded state;

[0021] Figure 2 This is a schematic diagram of an application scenario of the medical kit provided by the present invention according to an embodiment, in which the stent is in a radially contracted state;

[0022] Figure 3 This is a partial schematic diagram of a stent in a medical kit provided according to an embodiment of the present invention. The stent in the diagram is a bare metal stent.

[0023] Figure 4 This is a schematic diagram of the fit between the stent and the guidewire in a medical kit provided according to an embodiment of the present invention. The stent has a concave-convex structure on its outer peripheral surface.

[0024] Figure 5 This is a partial schematic diagram of a stent in a medical kit provided in an embodiment of the present invention. The stent in the diagram includes a bare metal stent and a protective structure, and an uneven structure is formed on the outer peripheral surface of the bare metal stent.

[0025] Figure 6 yes Figure 5 A partial schematic diagram illustrating the application scenario of the medical kit shown;

[0026] Figure 7 This is a schematic diagram of an application scenario of the medical kit provided by the present invention according to an embodiment. The stent in the diagram includes a protective structure, and the protective structure is a continuous membrane.

[0027] Figure 8 This is a schematic diagram of an application scenario of a medical kit provided by the present invention according to an embodiment. The stent in the diagram includes a protective structure, and the protective structure includes two sub-covers arranged axially spaced along the bare metal stent.

[0028] Figure 9 This is a schematic diagram of an application scenario of a medical kit provided by the present invention according to an embodiment. The stent in the diagram includes a protective structure, and the protective structure includes multiple sub-covering groups.

[0029] Figure 10 This is a partial structural schematic diagram of the stent of the medical kit provided according to an embodiment of the present invention. The stent in the diagram includes a bare metal stent and a friction-enhancing structure, and the friction-enhancing structure includes an elastic membrane.

[0030] Figure 11 This is a partial structural schematic diagram of the stent of the medical kit provided according to an embodiment of the present invention. The stent in the diagram includes a bare metal stent and a friction-enhancing structure, and the friction-enhancing structure includes a lubricating coating with an uneven outer surface.

[0031] [The annotations in the attached figures are explained below]:

[0032] 1-Guidewire, 10-First catheter, 20-Anchoring mechanism, 21-Second catheter, 22-Push rod, 23-Support, 231-Concave-convex structure, 231a-Protrusion, 231b-Concave, 232-Bare metal support, 233-Protective structure, 234-Friction-enhancing structure. Detailed Implementation

[0033] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the actual number, shape, and size of components in the actual implementation. In the actual implementation, the type, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex.

[0034] Furthermore, while each embodiment described below possesses one or more technical features, this does not imply that users of the present invention must simultaneously implement all technical features in any embodiment, or can only separately implement some or all technical features in different embodiments. In other words, provided it is feasible, those skilled in the art can, based on the disclosure of the present invention and depending on design specifications or implementation requirements, selectively implement some or all technical features in any embodiment, or selectively implement a combination of some or all technical features in multiple embodiments, thereby increasing the flexibility in implementing the present invention.

[0035] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “multiple” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “installed,” “connected,” and “linked” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be mechanical or electrical. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two elements or an interaction between two elements. Relational terms such as “first,” “second,” etc., are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly specify the number of indicated technical features. It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0036] The terms "proximal" and "distal" describe the relative positions and orientations of the various components and parts of a medical device. Although not restrictive, "proximal" usually refers to the end of the medical device that is closest to the operator during normal use, while "distal" is the end of the medical device that first enters the patient's body.

[0037] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar parts.

[0038] Figure 1 and Figure 2 This diagram illustrates an application scenario of the medical kit provided in an embodiment of the present invention. Please refer to... Figure 1 and Figure 2The medical kit includes a first catheter 10 and an anchoring mechanism 20. The first catheter 10 guides the anchoring mechanism 20 to a target location. The anchoring mechanism 20 includes a second catheter 21, a push rod 22, and a support 23. The second catheter 21 is configured to partially pass through the lumen of the first catheter 10. The push rod 22 is partially disposed within the lumen of the second catheter 21 and is capable of axial relative movement with respect to the second catheter 21. The proximal end of the support 23 is connected to the distal end of the push rod 22, and the support 23 is a self-expanding structure.

[0039] It should be understood that the medical kit has two states: a first state and a second state. When the medical kit is in the first state, the first catheter 10 and the anchoring mechanism 20 are independent of each other. When the medical kit is in the second state, the anchoring mechanism 20 is partially disposed within the lumen of the first catheter 10. The second state is the usage state of the medical kit.

[0040] In practical applications, the first catheter 10 is used as a guiding tube, providing a passage for the guidewire 1 and medical devices to enter and exit the human body. The anchoring mechanism 20 provides anchoring force to the guidewire 1 to reduce or even prevent guidewire 1 displacement. Specifically, when both the guidewire 1 and the anchoring mechanism 20 are partially inserted into the lumen of the first catheter 10, and the anchoring mechanism 20 is in the target position, by controlling the second catheter 21 and the push rod 22 to move axially relative to each other, the support 23 extends from the distal end of the second catheter 21 and expands radially. The support 23 then presses against the guidewire 1, providing compressive force to anchor the guidewire 1. To release the anchoring of the guidewire 1, it is only necessary to manipulate the second catheter 21 and the push rod 22 to move axially relative to each other again, so that the support 23 retracts into the lumen of the second catheter 21. This method of use has the advantages of being simple and quick to operate. Compared with the existing technology of using an anchoring balloon to anchor the guide wire 1, it does not require the introduction of Luer connectors, syringes and other infusion and aspiration equipment, reducing the use of consumables and lowering economic costs. It can also achieve anchoring quickly without waiting for the anchoring balloon to slowly inflate, and there is no need to wait for the anchoring balloon to slowly depressurize when releasing the anchor, which can shorten the operation time.

[0041] It is understood that during the process of introducing the anchoring mechanism 20 into the lumen of the first conduit 10, the stent 23 is pressed into the lumen of the second conduit 21 and is in a radially contracted state. The stent 23 comprises at least a bare metal stent ( Figure 1 and Figure 2(Not specified in the text) The bare metal support is made of a superelastic metal, so that the support 23 is a self-expanding structural component. Optional superelastic metals include, for example, nickel-titanium alloys or other shape memory alloys. The bare metal support can be formed by cutting and shaping tubing, or by weaving and shaping wire; this embodiment of the invention does not limit the specific method used.

[0042] In addition, the anchoring mechanism 200 also includes a imaging element (not shown in the figure), which is disposed on the support 23 to display the position of the support 23 in the body.

[0043] With a fixed coefficient of friction on the outer circumferential surface of the bracket 23, the force between the bracket 23 and the guide wire 1 is directly proportional to the number of contact points between them. That is, the more contact points between the bracket 23 and the guide wire 1, the stronger the force between them, and the better the anchoring effect on the guide wire 1. Therefore, for some brackets 23 with smooth outer circumferential surfaces and low coefficients of friction, to ensure anchoring effectiveness, it is necessary to increase the metal coverage of the bare metal bracket to increase the number of contact points between the bracket 23 and the guide wire 1. However, those skilled in the art know that when the metal coverage of the bare metal bracket is too high, the elasticity of the bracket 23 decreases significantly, causing the bracket 23 to be unable to automatically expand and contract radially. In other words, for brackets 23 with smooth outer circumferential surfaces and low coefficients of friction, balancing anchoring effectiveness and elasticity requires stringent requirements on the metal coverage of the bare metal bracket, increasing design and manufacturing complexity.

[0044] Preferably, a friction-enhancing structure is formed on the outer peripheral surface of the support 23. Figure 1 and Figure 2 (Not shown in the image), the friction-enhancing structure is used to increase the friction coefficient of the outer circumferential surface of the support 23. It can improve the interaction force between the support 23 and the guide wire 1 without increasing the metal coverage of the bare metal support, thus improving the anchoring effect. The projection of the friction-enhancing structure onto a plane perpendicular to the axial direction of the support 23 is a closed ring. This ensures that regardless of the relative circumferential orientation of the guide wire 1 and the support 23, they can always contact the friction-enhancing structure, resulting in a larger interaction force between the support 23 and the guide wire 1.

[0045] The specific configuration of the support 23 with the friction-enhancing structure will be described next through specific embodiments. It is understood that the following description is by way of enumeration, but it is impossible to exhaust all possible configurations, and therefore should not be construed as an undue limitation on the present invention.

[0046] <Example 1>

[0047] Figure 3 A partial structural schematic diagram of the stent 23 of the medical kit provided in this embodiment is shown. Figure 3 As shown, the support 23 is a bare metal support. During the fabrication of the support 23, a textured structure 231 is formed on its outer peripheral surface through laser cutting, sandblasting, and acid pickling. In this embodiment, the textured structure 231 is the friction-enhancing structure.

[0048] It is understood that the concave-convex structure 231 includes a plurality of protrusions 231a arranged circumferentially along the bare metal support, with a concave portion 231b formed between two adjacent protrusions 231a. In some cases, part of the structure of the guidewire 1 may also be as follows: Figure 4 As shown, it is positioned at the recess 231b to further increase the force between the support 23 and the guide wire 20.

[0049] <Example 2>

[0050] Figure 5 A partial structural schematic diagram of the stent 23 of the medical kit provided in this embodiment is shown. Figure 5 As shown, the support 23 includes a bare metal support 232 and a protective structure. The outer circumferential surface of the bare metal support 232 has a convex-concave structure 231. The convex-concave structure 231 includes a plurality of protrusions 231a spaced apart circumferentially along the bare metal support 232, with a concave portion 231b formed between two adjacent protrusions 231a. Each protrusion 231a has a peak, and each concave portion 231b has a concave bottom, such that the convex-concave structure 231 includes peaks and concave bottoms arranged alternately along the circumferential direction of the bare metal support 232. The peak is the position on the protrusion 231a with the largest distance from the axis of the bare metal support 231, and the concave bottom is the position on the concave portion 231b with the smallest distance from the axis of the bare metal support 231. The height difference between the peak and the concave bottom is Δh. The protective structure 233 is attached to the uneven structure 231, and the projection of the protective structure 233 onto a plane perpendicular to the axial direction of the support 23 is a closed ring. The hardness of the protective structure 233 is less than a preset value, and the thickness of the protective structure 233 at the bottom of the concave area is d1, and the thickness of the protective structure 232 at the top of the concave area is d2. d1, d2, and Δh satisfy the condition: d1 < d2 + Δh, to prevent the protective structure 233 from filling the concave area 231b and causing the support surface to no longer have an uneven structure. That is, after the protective structure 233 is installed, the outer peripheral surface of the support 23 remains an uneven and rough surface. In other words, the friction-enhancing structure includes the uneven structure 231 and the protective structure 233.

[0051] The reason for setting the protective structure 233 is that the surface of the guide wire 1 is coated with a hydrophilic coating (not shown in the figure). If the guide wire 1 directly contacts the bare metal support 232, the hydrophilic coating is easily damaged by the protrusion 231a during contact with the uneven structure 231. However, with the protective structure 233 set, the guide wire 1 directly contacts the protective structure 233 instead of directly contacting the uneven structure 231 (e.g., ...). Figure 6 As shown in the diagram, the protective structure 233 serves to isolate the hydrophilic coating from the uneven structure 231, thus preventing the hydrophilic coating from being damaged by the uneven structure 231. It should be understood that, for this protective function, the hardness of the protective structure 233 should be less than the hardness of the hydrophilic coating; that is, the hardness of the hydrophilic coating is the "preset value" mentioned above.

[0052] Furthermore, the purpose of controlling the projection of the protective structure 233 onto a plane perpendicular to the axial direction of the support 23 to be a closed ring is to ensure that, regardless of the relative position of the guide wire 1 and the support 23 in the circumferential direction, the guide wire 1 can directly contact the protective structure 233, rather than directly contacting the concave-convex structure 231. It should be noted that, due to the presence of the concave-convex structure 231, the projection of the protective structure 233 onto a plane perpendicular to the axial direction of the support 23 may not be a ring, but rather a configuration formed by alternating circumferentially arranged protrusions and recesses.

[0053] In some alternative implementations, the protective structure 233 includes a smooth coating, such as a lubricating coating. The coating may include at least one of polytetrafluoroethylene (PTFE) or parylene. A smooth coating means that, when unfolded into a planar shape, the outer surface of the coating is smooth rather than uneven.

[0054] In some alternative implementations, the protective structure 233 includes a membrane. This embodiment does not particularly limit the specific arrangement of the membrane, as long as it satisfies the effect that "the projection of the protective structure 233 onto a plane perpendicular to the axial direction of the support 23 is a closed ring." Optionally, as... Figure 7 As shown, the coating is a monolithic structure that extends continuously in the circumferential and axial directions of the bare metal support 232. Alternatively, as... Figure 8 As shown, the coating includes multiple sub-coatings, which are spaced apart axially on the bare metal support 232, with each sub-coating extending circumferentially around the bare metal support. Alternatively, as... Figure 9As shown, the coating includes multiple sub-coating groups, which are arranged circumferentially around the bare metal support 232. Each sub-coating group includes multiple sub-coatings, and the multiple sub-coatings in the same sub-coating group are arranged axially around the bare metal support 232.

[0055] The covering is preferably an elastic membrane, thus having a large coefficient of friction, which can further increase the interaction force between the stent 23 and the guide wire 1. The material of the elastic membrane includes, but is not limited to, at least one of medical silicone and polyester.

[0056] <Example 3>

[0057] In this embodiment, as Figure 10 and Figure 11 As shown, the bracket 23 includes a bare metal bracket 232 and the friction-enhancing structure 234. The outer peripheral surface of the bare metal bracket 232 is smooth, and the friction-enhancing structure 234 is attached to the outer peripheral surface of the bare metal bracket 232. The projection of the friction-enhancing structure 234 onto a plane perpendicular to the axial direction of the bracket 23 is a closed ring, specifically a circular ring. The coefficient of friction of the outer surface of the friction-enhancing structure 234 is greater than the coefficient of friction of the outer peripheral surface of the bare metal bracket 232.

[0058] In one implementation, such as Figure 10 As shown, the friction-enhancing structure 234 includes an elastic membrane. This embodiment does not particularly limit the specific arrangement of the elastic membrane, as long as it satisfies the effect that "the projection of the friction-enhancing structure onto a plane perpendicular to the axial direction of the support 23 is a closed ring." Optionally, the elastic membrane is a single integral structure that extends continuously in the circumferential and axial directions of the bare metal support 232. Alternatively, the elastic membrane includes multiple sub-membrane bodies, which are spaced apart in the axial direction of the bare metal support 232, each sub-membrane body extending circumferentially around the bare metal support 232. Or, the elastic membrane includes multiple sub-membrane body groups, which are spaced apart circumferentially along the bare metal support 232, each sub-membrane body group including multiple sub-membrane bodies, with the sub-membrane bodies of the same group spaced apart axially along the bare metal support 232.

[0059] In another implementation method, such as Figure 11 As shown, the friction-enhancing structure 234 includes a coating, the outer surface of which is uneven. In practice, after the lubricating coating is formed on the outer surface of the bare metal support 232, grooves can be formed by etching to make the outer surface of the lubricating coating uneven.

[0060] While the present invention has been disclosed above, it is not limited thereto. Those skilled in the art can make various modifications and variations to the present invention without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, the present invention also intends to include such modifications and variations.

Claims

1. A medical kit, characterized in that, The device includes a first conduit and an anchoring mechanism; the first conduit guides the anchoring mechanism to a target position; the anchoring mechanism includes a second conduit, a push rod, and a support, wherein the second conduit is partially inserted into the lumen of the first conduit, the push rod is partially disposed within the lumen of the second conduit and is capable of axial relative movement with the second conduit, the distal end of the push rod is connected to the proximal end of the support, and the support is a self-expanding structural component; By controlling the second catheter and the push rod to generate axial relative movement, the stent extends from the distal end of the second catheter and expands radially. The expanded stent presses against the guidewire that passes through the lumen of the first catheter, providing compressive force to the guidewire so that the guidewire is anchored.

2. The medical kit according to claim 1, characterized in that, A friction-enhancing structure is formed on the outer peripheral surface of the bracket, and the projection of the friction-enhancing structure on a plane perpendicular to the axial direction of the bracket is a closed ring.

3. The medical kit according to claim 2, characterized in that, The support includes a bare metal support, and the outer peripheral surface of the bare metal support has a concave-convex structure; the friction-enhancing structure includes the concave-convex structure.

4. The medical kit according to claim 3, characterized in that, The concave-convex structure includes concave bottoms and peaks arranged alternately along the circumference of the bare metal support, with a height difference of Δh between the peaks and the concave bottoms; the support also includes a protective structure attached to the concave-convex structure, and the projection of the protective structure onto a plane perpendicular to the axial direction of the support is a closed ring, the hardness of the protective structure being less than a preset value; the thickness of the protective structure at the concave bottom is d1, the thickness of the protective structure at the peak is d2, and d1, d2, and Δh satisfy: d1 < d2 + Δh; the friction-enhancing structure also includes the protective structure.

5. The medical kit according to claim 4, characterized in that, The protective structure includes an elastic membrane.

6. The medical kit according to claim 4, characterized in that, The protective structure includes a coating.

7. The medical kit according to claim 2, characterized in that, The support includes a bare metal support and the friction-enhancing structure. The outer peripheral surface of the bare metal support is smooth. The friction-enhancing structure is attached to at least a portion of the outer peripheral surface of the bare metal support. The friction coefficient of the outer surface of the friction-enhancing structure is greater than the friction coefficient of the outer peripheral surface of the bare metal support.

8. The medical kit according to claim 7, characterized in that, The friction-enhancing structure includes an elastic membrane.

9. The medical kit according to claim 7, characterized in that, The friction-enhancing structure includes a coating, and the outer surface of the coating is uneven.

10. The medical kit according to claim 1, characterized in that, The anchoring mechanism also includes a developing element, which is disposed on the support.

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