CN117653374A - Elastic supporting device for slender flexible instrument - Google Patents

Abstract

The invention provides an elastic support device for an elongated flexible instrument, which comprises a first fixing component, a second fixing component and a plurality of elastic support pieces which are arranged along a first straight line direction. The elastic supporting piece comprises a guiding part and a plurality of supporting feet. The guide portion is provided with a guide hole for the passage of the elongated flexible instrument. The supporting legs are respectively a first supporting leg and a second supporting leg; one end of each of the first supporting leg and the second supporting leg is connected to the guide part, and the other ends of the first supporting leg and the second supporting leg extend in opposite directions to form a connecting end. The first support legs and the second support legs between the guide portions of adjacent ones of the elastic support members are in one-to-one correspondence and are connected to each other at their connection ends to cooperatively form a support and to form a space between the guide portions in the adjacent ones of the elastic support members. The elastic support piece is an elastic piece which is integrally manufactured and is used for changing the interval between the adjacent guide parts by changing the included angle between the straight line where the two ends of the support leg are positioned and the first straight line.

Description

Elastic supporting device for slender flexible instrument

Technical Field

The invention belongs to the technical field of medical appliances, and particularly relates to an elastic supporting device for an elongated flexible appliance.

Background

In medical procedures, it is often necessary to use an elongated flexible instrument (e.g., bronchoscopy introducer sheath, etc.) that is maneuvered deep into the body to perform the procedure. In order to ensure that the slender flexible instrument can be smoothly inserted into a human body, the instrument part before entering the human body must be kept in a straight state, so that the damage caused by excessive bending is avoided.

Operators often need to hold the elongated flexible instrument straight by hand during surgery. However, in some automatic surgical scenarios, the requirement for straightness of the elongated flexible instrument is relatively high, and is difficult to achieve by only holding, so that an auxiliary device is generally required to support the elongated flexible instrument to prevent the elongated flexible instrument from being excessively bent as a result of the front end touching an object.

Disclosure of Invention

The invention aims to provide a novel elastic supporting device for an elongated flexible instrument, which is arranged on a medical surgical instrument and the like and is used for supporting the elongated flexible instrument (such as a bronchoscope guiding sheath tube and the like) to keep the elongated flexible instrument in a straight state in an operation, so as to avoid damage caused by excessive bending.

The technical scheme of the invention is as follows:

an elastic supporting device for an elongated flexible instrument comprises a first fixing component, a second fixing component and a plurality of elastic supporting pieces which are arranged along a first straight line direction, wherein the first fixing component and the second fixing component are respectively connected with the elastic supporting pieces at the outermost sides of two ends along the first straight line direction, the first fixing component is used for being connected with the elongated flexible instrument, and the second fixing component is used for being connected with an external component; the elastic support includes:

the guide parts are arranged at intervals along the first linear direction; the guide part is provided with guide holes for the long and thin flexible instrument to pass through, the guide holes on the guide parts of the elastic support pieces are distributed along the first linear direction and matched to form a guide channel, and the guide channel is used for accommodating the long and thin flexible instrument and guiding the travelling direction of the long and thin flexible instrument;

the support legs are divided into two parts, namely a first support leg and a second support leg; one end of each of the first supporting leg and the second supporting leg is connected to the guide part, the other end of the first supporting leg extends towards the first end direction and the circumferential outer direction along the first straight line direction and forms a connecting end of the first supporting leg, and the other end of the second supporting leg extends towards the second end direction and the circumferential outer direction along the first straight line direction and forms a connecting end of the second supporting leg;

the first supporting legs and the second supporting legs which are adjacent to each other and are arranged between the guiding parts of the elastic supporting pieces are in one-to-one correspondence and are connected with each other at the connecting ends of the first supporting legs and the second supporting legs so as to form a support in a matching way and form a space between the guiding parts in the adjacent elastic supporting pieces;

the elastic support piece is an elastic piece which is integrally manufactured and is used for changing the interval between the guide parts in the adjacent elastic support pieces by changing the included angle between the straight line where the two ends of the support legs are positioned in the elastic support piece and the first straight line.

An elastic support device for an elongated flexible instrument in one embodiment, the elastic support being a spring plate.

In one embodiment, the elastic supporting device for the elongated flexible apparatus is characterized in that the supporting legs in the same elastic supporting piece are circumferentially and uniformly distributed on the guiding part, and the first supporting leg and the second supporting leg are spaced apart.

In one embodiment, the elastic supporting device for the elongated flexible device, the guiding hole is located at the center of the elastic supporting piece, and the elastic supporting piece comprises two first supporting feet and two second supporting feet, and four supporting feet are symmetrically arranged around the center of the guiding hole.

In one embodiment, the elastic supporting device for the elongated flexible device is welded between the connecting end of the first supporting leg and the connecting end corresponding to the second supporting leg.

In one embodiment, the elastic support device for the slender flexible instrument is characterized in that the guide hole is wrapped with a cutting prevention sleeve.

In one embodiment, the elastic supporting device for the slender flexible instrument is characterized in that the joint of the first supporting leg and the corresponding second supporting leg is provided with a cutting preventing structure.

In one embodiment, the elastic supporting device for the elongated flexible apparatus is provided with a cutting-preventing ring between adjacent elastic supporting pieces, and the cutting-preventing ring wraps the joint between each first supporting leg and the corresponding second supporting leg between two guiding parts of the adjacent elastic supporting pieces.

In one embodiment, the elastic supporting device for the slender flexible instrument is formed by connecting all the elastic supporting pieces, and the outer surface of the elastic supporting component is provided with a glue wrapping layer.

An elastic support device for an elongated flexible instrument in one embodiment, the first fixation assembly comprising a first base and a first fixation portion, the first fixation portion and the elastic support being located at both ends of the first base in the first linear direction; the first fixing part is connected with the first base and is used for being connected with an elongated flexible instrument, and the connecting end, closest to the first fixing component, of the supporting leg on the guiding part of the first fixing component is connected with the first base;

the second fixing assembly comprises a second base and a second fixing part, and the second fixing part and the elastic supporting piece are positioned at two ends of the second base along the first straight line direction; the second fixing part is connected with the second base and is used for being connected with an external component, and the connecting end, closest to the second fixing component, of the supporting leg on one side of the guiding part, closest to the second fixing component is connected with the second base.

By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:

according to the elastic supporting device for the slender flexible instrument, provided by the invention, the first supporting leg and the second supporting leg between the two guiding parts in the two adjacent elastic supporting pieces are in a triangular configuration, and the straight line and the first straight line of the first supporting leg and the second supporting leg form a triangular configuration, so that the supporting effect can be achieved, and the slender flexible instrument positioned in the guiding channel can be kept in a straight state.

The first fixing component is fixed on the slender flexible instrument and moves along with the movement of the slender flexible instrument; the second fixing assembly is fixed on the outer member, and the outer member is fixed. When the device is used, the slender flexible instrument passes through the guide hole on the guide part, and when the slender flexible instrument moves towards the direction close to a human body, the supporting legs rotate relative to the guide part, so that the included angle between the straight line where the two ends of the supporting legs are positioned and the first straight line direction (the included angle refers to a pair of included angles with smaller angles in two pairs of included angles of the straight line where the supporting legs are positioned and the first straight line travel) is increased, the guide parts in the two adjacent elastic supporting pieces are mutually close, and the distance between the guide parts is reduced, so that the integral length of the elastic supporting device is also reduced; when the slender flexible instrument moves in a direction away from a human body, the supporting legs rotate relative to the guide parts, so that an included angle between a straight line where the supporting legs are positioned and a first straight line (the included angle refers to a pair of included angles with smaller angles in two pairs of included angles of the straight line where the supporting legs are positioned and the first straight line travel) is smaller, the guide parts in two adjacent elastic supporting pieces are mutually far away, and the distance between the guide parts is increased, so that the whole length of the elastic supporting device is also increased. In this way, the portion of the elongate flexible instrument before entering the body is always supported by the elastic support means of the present invention, such that the elongate flexible instrument in the guide channel is always maintained in the first straight direction.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.

FIG. 1 is a schematic view of an elastic support device (with slurry coating, not shown) for an elongated flexible device in an extended state according to the present invention;

FIG. 2 is a schematic view of the structure of an elastic support device (slurry coating is not shown) for an elongated flexible device in a compressed state according to the present invention;

FIG. 3 is a schematic view of an elastic support assembly (slurry coating is used, slurry coating is not shown) in an extended state according to the present invention;

FIG. 4 is a schematic view of an elastic support assembly (slurry coating is used, slurry coating is not shown) in a compressed state according to the present invention;

FIG. 5 is a schematic view of a resilient support of the present invention in a flattened condition;

FIG. 6 is a schematic view of another elastic support assembly (employing a cut-resistant sleeve and a cut-resistant ring) of the present invention in an extended state;

fig. 7 is a schematic view showing the installation of a eyelet and a guide hole of the present invention.

Reference numerals illustrate:

1: an elongate flexible instrument; 2: an inlet on the human body; 3: a bracket; 4: a first fixing portion; 5: a first base; 6: a second fixing portion; 7: a second base; 8: an elastic support; 81: a guide part; 82: a first support leg; 83: a second support leg; 84: a guide hole; 85: a connection end; 86: a cutting prevention ring; 9 female nails; 10: and (5) sub-nailing.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.

For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.

Referring to fig. 1 to 7, the present embodiment provides an elastic support device for an elongated flexible instrument, comprising a first fixing assembly, a second fixing assembly and a plurality of elastic supports 8 arranged in a first straight line direction. For convenience of description, the elastic supporting device of the present embodiment is disposed along the left-right direction, that is, the two end directions of the first straight line direction are directed in the left-right direction.

The first fixing component and the second fixing component are respectively located at two ends of the elastic supporting device in the whole embodiment along the first linear direction, and two elastic supporting pieces 8 at the outermost sides of the two ends along the first linear direction are respectively connected with the first fixing component and the second fixing component. The first fixation assembly is for connection with the elongated flexible instrument 1 and the second fixation assembly is for connection with an external member. I.e. the first fixing element is arranged to the left and the second fixing element to the right.

The elastic support 8 comprises a guide 81 and several supports. The guide portions 81 are arranged at intervals along the first linear direction; the guiding part 81 is provided with guiding holes 84 for the long and thin flexible instrument 1 to pass through, and the guiding holes 84 on the guiding part 81 of the plurality of elastic supporting pieces 8 are distributed along the first linear direction and matched to form a guiding channel, and the guiding channel is used for accommodating the long and thin flexible instrument 1 and guiding the travelling direction of the long and thin flexible instrument 1.

The supporting feet in the same elastic supporting piece 8 are divided into two parts, namely a first supporting foot 82 and a second supporting foot 83. One end of the first supporting leg 82 and one end of the second supporting leg 83 are both connected to the guide portion 81, the other end of the first supporting leg 82 extends in a first end direction and a circumferential outer direction along the first straight line direction to form a connecting end 85 of the first supporting leg 82, and the other end of the second supporting leg 83 extends in a second end direction and a circumferential outer direction along the first straight line direction to form a connecting end 85 of the second supporting leg 83. That is, the two ends of the supporting leg are respectively a connecting end 85 and one end connected with the guiding part 81; the connecting end 85 of the first support leg 82 extends in an oblique direction to the left and the outside with respect to the other end of the first support leg 82 (also referred to as the guide portion 81), and the connecting end 85 of the second support leg 83 extends in an oblique direction to the right and the outside with respect to the other end of the second support leg 83 (also referred to as the guide portion 81).

The first and second support feet 82, 83 between the guide portions 81 of adjacent elastic supports 8 are in one-to-one correspondence and are connected to each other at their connecting ends 85 to cooperate to form a support and to form a space between the guide portions 81 in the adjacent elastic supports 8. The elastic supporting pieces 8 are elastic pieces integrally formed and are used for changing the interval between the guiding parts 81 in the adjacent elastic supporting pieces 8 by changing the included angle between the straight line where the two ends of the supporting legs are positioned in the elastic supporting pieces 8 and the first straight line. Therefore, in the adjacent two elastic supporting members 8, each pair of the first supporting leg 82 and the second supporting leg 83 (i.e., the second supporting leg 83 in the left elastic supporting member 8 and the first supporting leg 82 in the right elastic supporting member 8) between the two guiding portions 81 forms a triangular configuration, so that the elongated flexible instrument 1 positioned in the guiding path is kept straight by the straight line of the two ends of the first supporting leg 82, the straight line of the two ends of the second supporting leg 83 and the first straight line of the guiding path (or the first straight line of the elongated flexible instrument 1 positioned in the guiding path); while also providing a spacing between two guides 81 in adjacent elastic supports 8.

Moreover, since the elastic supporting member 8 is an integrally made elastic member, when the two adjacent guiding portions 81 are close to each other or far away from each other, the supporting leg may also rotate about the joint with the guiding portion 81 (may not rotate completely in the actual process), the whole supporting leg may also be elastically deformed, and the angle between the straight line where the two ends of the supporting leg are located and the first straight line may be changed), so that the distance between the two ends of the supporting leg in the first straight line direction may be changed, and the distance between the two adjacent guiding portions 81 may be changed, thereby changing the length of the elastic supporting device (particularly, the length along the first straight line direction) in the whole embodiment.

The first fixing component is fixed on the slender flexible instrument 1 and moves along with the movement of the slender flexible instrument 1; the second fixing assembly is fixed on the outer member, and the outer member is fixed. When in use, the slender flexible equipment 1 passes through the guide holes 84 on the guide parts 81, and when the slender flexible equipment 1 moves towards the direction approaching to the human body, the supporting feet rotate relative to the guide parts 81, so that the two adjacent guide parts 81 are mutually close to each other, and the overall length of the elastic supporting device of the embodiment is reduced; when the elongated flexible device 1 is moved away from the human body, the support legs rotate relative to the guide portions 81, so that the adjacent two guide portions 81 are moved away from each other, and the overall length of the elastic support device of the present embodiment is increased accordingly. In this way, the portion of the elongated flexible device 1 before entering the human body is always supported by the elastic support means of the present embodiment, so that the elongated flexible device 1 in the guide channel is always kept in the first straight direction.

The elongate flexible instrument 1 may be, among other things, a bronchoscopy introducer sheath, an intravascular ultrasound catheter, etc., without limitation. The guide channels are formed by mating guide holes 84 in the guide portions 81, and adjacent guide portions 81 are in most cases spaced apart (or in some embodiments, adjacent guide portions 81 are always spaced apart), so that the solid portions of the guide channels (i.e., the walls of the guide holes 84) are intermittent.

The resilient support means for the elongate flexible instrument of this embodiment will be further described below.

The elastic support 8 may be a leaf spring. The supporting feet in the same elastic supporting piece 8 can be circumferentially and uniformly distributed on the guiding portion 81, and the first supporting feet 82 and the second supporting feet 83 are distributed at intervals. Specifically, as shown in fig. 3 and 5, the elastic support 8 may employ a spring piece similar to a cross shape, and the guide hole 84 is located at the center of the elastic support 8, that is, at the intersection of the transverse "one" and the vertical "one" in the cross shape; there are two first support feet 82 and two second support feet 83, the four support feet being arranged centrally symmetrically about the guide hole 84.

In the absence of a force, the support feet and the guide 81 on the elastic support 8 are not in the same plane (see fig. 3), so that the structure of the plurality of elastic support 8 after connection has a supporting effect. Meanwhile, the elastic supporting pieces 8 are supported by the supporting legs and the guide 81 in the same plane (see fig. 4 and 5) when they are flattened, thus enabling the elastic supporting device of the present embodiment to have a good compression ratio.

The connecting end 85 of the first supporting leg 82 and the connecting end 85 of the corresponding second supporting leg 83 can be connected through welding; of course, in other embodiments, other attachment means, such as glue bonds, etc., may be used.

For convenience of description, the whole formed by connecting all the elastic supports 8 is referred to as an elastic support assembly. When the elongated flexible device 1 is deformed and bent due to the force applied to the front end (in practical situations, the micro bending of the elongated flexible device 1 is allowed, but the bending angle cannot be too large, and the elastic supporting device of the embodiment can prevent the excessive bending of the elongated flexible device 1), an acting force is applied to the hole wall of the guide hole 84, so as to drive the guide portion 81 to move, the whole elastic supporting assembly is not arranged along the first straight line direction but is in a bent state, at this time, the supporting legs on the elastic supporting member 8 are deformed differently to generate a return elastic force, and finally the elongated flexible device 1 is automatically pulled back to the straight state.

The elastic support 8 in this embodiment is preferably a stainless steel sheet 0.15 mm thick. In other embodiments, the material and thickness of the elastic supporting members 8, the number of supporting legs on each elastic supporting member 8, the arrangement of the supporting legs, etc. may be selected according to practical situations, and are not limited herein.

In this embodiment, the stainless steel sheet is thinner, and the elongated flexible device 1 is easy to cut, so that the elastic support assembly can be further encapsulated, and a glue coating layer is formed on the outer surface of the elastic support assembly, so as to avoid cutting the elongated flexible device 1 or scratching an operator during operation. Of course, in other embodiments, other anti-cut treatments may be used, such as: each guide hole 84 is wrapped with a cutting-preventing sleeve, the cutting-preventing sleeve can be a ferrule made of non-metal material (the ferrule can be made of plastic specifically), the ferrule is adhered to the guide hole 84 by using biocompatible self-adhesive, or a eyelet made of metal material (as shown in fig. 7, the eyelet comprises a female nail 9 and a male nail 10, the female nail 9 and the male nail 10 are respectively positioned at two sides of the guide part 81, a convex part on the female nail 9 passes through the guide hole 84 to reach the other side of the guide part 81, the male nail 10 is sleeved on the convex part of the female nail 9, and then the convex part of the female nail 9 is knocked to deform to realize fixed connection between the female nail 9 and the male nail 10), so that the elongated flexible instrument 1 is prevented from being cut at the guide hole 84; the connection between the first support leg 82 and the corresponding second support leg 83 is provided with a cut preventing structure, which may be a cut preventing ring 86 provided between the adjacent elastic support members 8, and the cut preventing ring 86 wraps the connection between each first support leg 82 and the corresponding second support leg 83 between the two guide portions 81 of the adjacent elastic support members 8, thereby preventing the operator from cutting hands.

The first fixing component comprises a first base 5 and a first fixing part 4, and the first fixing part 4 and the elastic supporting component are positioned at two ends of the first base 5 along a first straight line direction; the first fixing portion 4 is connected to the first base 5 for connection to the elongated flexible device 1, and a connection end 85 of a support leg on the side closest to the first fixing element on the guiding portion 81 closest to the first fixing element is connected to the first base 5. The second fixing component comprises a second base 7 and a second fixing part 6, and the second fixing part 6 and the elastic supporting component are positioned at two ends of the second base 7 along the first straight line direction; the second fixing portion 6 is connected to the second base 7, and is used for being connected to an external member, and a connection end 85 of a supporting leg on a side closest to the second fixing assembly on the guiding portion 81 closest to the second fixing assembly is connected to the second base 7.

When the slender flexible instrument 1 works, the slender flexible instrument 1 gradually penetrates into the human body from the inlet 2 on the human body, namely, the slender flexible instrument 1 moves relative to the human body surface, the external components need to be fixed relative to the human body surface, and in actual cases, the external components are components which are fixed relative to the operation table in operation, and the slender flexible instrument 1 is not limited; taking the elongated flexible instrument 1 as a bronchoscope guiding sheath for example, the external component can be a bracket 3 on the instrument for driving the bronchoscope to act, or can be a component fixed on an operation table, etc.

The specific structures of the first fixing portion 4 and the second fixing portion 6 are not limited, and a clamping structure is adopted in the present embodiment. One of two clamping jaws in the clamping structure is fixedly connected to the first base 5/the second base 7, and the two clamping jaws are matched to clamp corresponding external connecting members; the external connecting component corresponding to the first fixing part 4 is an elongated flexible instrument 1 or an intermediate piece for realizing indirect connection between the first fixing part 4 and the elongated flexible instrument 1, and the external connecting component corresponding to the second fixing part 6 is a component fixed relative to a surgical operation table in operation.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.

Claims (10)

1. An elastic supporting device for an elongated flexible instrument is characterized by comprising a first fixing component, a second fixing component and a plurality of elastic supporting pieces which are arranged along a first straight line direction, wherein the first fixing component and the second fixing component are respectively connected with the elastic supporting pieces at the outermost sides of two ends along the first straight line direction, the first fixing component is used for being connected with the elongated flexible instrument, and the second fixing component is used for being connected with an external component; the elastic support includes:

the guide parts are arranged at intervals along the first linear direction; the guide part is provided with guide holes for the long and thin flexible instrument to pass through, the guide holes on the guide parts of the elastic support pieces are distributed along the first linear direction and matched to form a guide channel, and the guide channel is used for accommodating the long and thin flexible instrument and guiding the travelling direction of the long and thin flexible instrument;

the support legs are divided into two parts, namely a first support leg and a second support leg; one end of each of the first supporting leg and the second supporting leg is connected to the guide part, the other end of the first supporting leg extends towards the first end direction and the circumferential outer direction along the first straight line direction and forms a connecting end of the first supporting leg, and the other end of the second supporting leg extends towards the second end direction and the circumferential outer direction along the first straight line direction and forms a connecting end of the second supporting leg;

the first supporting legs and the second supporting legs which are adjacent to each other and are arranged between the guiding parts of the elastic supporting pieces are in one-to-one correspondence and are connected with each other at the connecting ends of the first supporting legs and the second supporting legs so as to form a support in a matching way and form a space between the guiding parts in the adjacent elastic supporting pieces;

the elastic support piece is an elastic piece which is integrally manufactured and is used for changing the interval between the guide parts in the adjacent elastic support pieces by changing the included angle between the straight line where the two ends of the support legs are positioned in the elastic support piece and the first straight line.

2. The elastic support device for an elongated flexible instrument according to claim 1, wherein the elastic support is a leaf spring.

3. The elastic support device for an elongated flexible instrument according to claim 1, wherein the support legs in the same elastic support member are circumferentially uniformly distributed on the guide portion, and the first support leg and the second support leg are spaced apart.

4. A resilient support for an elongated flexible device according to claim 3, wherein said guide hole is located in the centre of said resilient support, said resilient support comprising two of said first support feet and two of said second support feet, four of said support feet being arranged symmetrically about the centre of said guide hole.

5. The elastic support device for an elongated flexible instrument according to claim 1 or 2, wherein the connection end of the first support foot and the connection end of the corresponding second support foot are welded together.

6. The elastic support device for an elongated flexible instrument according to claim 2, wherein the guide hole is wrapped with a cut-preventing sleeve.

7. The elastic support device for an elongated flexible instrument according to claim 2, wherein the connection of said first support foot and the corresponding second support foot has a cut-preventing structure.

8. The elastic support device for an elongated flexible instrument according to claim 7, wherein a cut-preventing ring is provided between adjacent ones of said elastic support members, said cut-preventing ring wrapping around a junction of each of said first support leg and corresponding said second support leg between two of said guide portions of adjacent ones of said elastic support members.

9. The elastic support device for an elongated flexible instrument according to claim 2, wherein all of said elastic support members are connected to form an elastic support assembly, said elastic support assembly having a glue-wrapping layer on an outer surface thereof.

10. The elastic support device for an elongated flexible instrument according to claim 1, wherein said first securing assembly comprises a first base and a first securing portion, said first securing portion and said elastic support being located at both ends of said first base in said first straight line direction; the first fixing part is connected with the first base and is used for being connected with an elongated flexible instrument, and the connecting end, closest to the first fixing component, of the supporting leg on the guiding part of the first fixing component is connected with the first base;

the second fixing assembly comprises a second base and a second fixing part, and the second fixing part and the elastic supporting piece are positioned at two ends of the second base along the first straight line direction; the second fixing part is connected with the second base and is used for being connected with an external component, and the connecting end, closest to the second fixing component, of the supporting leg on one side of the guiding part, closest to the second fixing component is connected with the second base.