Trachea cannula fixing device

Abstract

The utility model discloses a tracheal intubation fixing device which comprises a fixing piece, a supporting piece, a connecting piece and the like, tracheal intubation is conducted firstly, after the tracheal intubation is inserted in place, the fixing piece is fixed to the upper jaw, then the connecting piece is used for fixing the position of the tracheal intubation, and the tracheal intubation is located on the lower portion of the fixing piece and located between upper teeth and lower teeth. Furthermore, due to the fact that the supporting piece is specially arranged, the lower end of the supporting piece abuts against the upper end of the lower tooth, a gap is formed between the fixing piece and the lower tooth, the height of the gap is not smaller than the outer diameter of the trachea cannula due to the size of the supporting piece, and therefore the trachea cannula can pass through the gap. Through the arrangement, the tracheal intubation after tracheal intubation can bypass the soft tissues of the upper lip and the lower lip to be connected with the breathing machine, so that the tracheal intubation is prevented from being fixed to the perioral tissues to cause pressure injury to the perioral skin, and the beneficial effects are achieved.

Description

Technical Field

[0001] The utility model relates to the field of tracheal intubation auxiliary equipment, in particular to a tracheal intubation fixing device. Background Art

[0002] Mechanical ventilation through oral endotracheal intubation can quickly relieve the patient's airway obstruction and maintain airway patency. It is an important measure to rescue patients with respiratory dysfunction and is also one of the commonly used rescue measures and treatment methods in intensive care units. It can effectively reduce the probability of death from suffocation. In some scenarios, oral endotracheal intubation will be used for a long time, such as when critically ill patients are in critical condition and have a long course of illness.

[0003] Under the condition of using the existing oral endotracheal tube and its auxiliary devices, in the above-mentioned long-term use, the oral endotracheal tube and its fixing device are prone to pressure and friction, which may cause pressure injuries to the oral mucosa and perioral skin. Specifically, one of the current fixing devices for endotracheal tubes is to use a endotracheal fixer to fix the endotracheal tube, which can firmly fix the trachea. However, the fixing device located around the mouth is made of hard material and is in contact with the patient's perioral skin for a long time, which is easy to cause the patient's perioral skin pressure sores. Utility Model Content

[0004] The utility model aims to overcome the problems in the prior art and provides an oral endotracheal intubation device for preventing pressure damage to the oral mucosa and perioral skin, thereby solving the problem of high incidence of oral pressure damage in endotracheal intubation fixing devices in the prior art.

[0005] The utility model provides a tracheal intubation fixing device, comprising:

[0006] Fixed components, the fixed components include:

[0007] The fixing piece includes an elastic contact portion, the elastic contact portion is elastic, and the edge of the elastic contact portion can enter the undercut angle between the upper jaw and the upper teeth, so that the fixing piece is fixed to the upper jaw in the oral cavity;

[0008] A support member, the support member is connected to the lower part of the fixing member, the lower end of the support member abuts against the upper end of the lower teeth, so that there is a gap between the fixing member and the lower teeth, and the height of the gap is not less than the outer diameter of the endotracheal tube;

[0009] A connecting piece is connected to the lower part of the fixing piece, and the connecting piece is detachably connected to the endotracheal tube.

[0010] Furthermore, the fixing member includes a base portion having an upper surface and a lower surface relative to each other, the connecting member and the supporting member are both connected to the lower surface of the base portion, the upper surface of the base portion is provided with a groove, and the elastic contact portion is fixedly connected in the groove.

[0011] Furthermore, the elastic contact portion is made of two-component silicone rubber, and the elastic contact portion has a plastic state at the beginning of the two-component mixing and a solidified elastic state formed after a period of mixing. When the elastic contact portion is in the plastic state, it is in the groove, and the upper part of the elastic contact portion in the plastic state is filled into the maxillary concave part and the undercut angle between the maxillary and the upper teeth, so that the elastic contact portion can be fixed at the maxillary in the oral cavity when it is in the solidified elastic state.

[0012] The groove is provided with a plurality of limiting slots on the surface facing the elastic contact part, and the lower part of the elastic contact part in the plastic state is filled into the limiting slots so that the elastic contact part is fixedly connected to the groove.

[0013] Furthermore, the fixing part also includes: an upper lip pulling portion, which is fixedly connected to one end of the base portion facing outside the oral cavity, and one end of the upper lip pulling portion away from the base portion can press against the upper lip to push the upper lip upward so that the upper lip does not contact the tracheal tube.

[0014] Furthermore, the upper lip pulling portion is made of an elastic material;

[0015] A protrusion is connected to one end of the upper lip pulling portion away from the base portion, and the protrusion is used to abut against the upper lip to push the upper lip upward. The contact portion between the protrusion and the upper lip has a contact curved surface, and the contact curved surface is configured to be able to fitly contact the surface of the upper lip.

[0016] Furthermore, the support member includes: two protrusions, which are respectively fixedly connected to the left and right sides of the base, and the protrusions are located on the lower surface of the base, the lower ends of the protrusions are used to abut against the lower teeth on both sides, the height of the protrusions is not less than the outer diameter of the tracheal tube, and friction patterns are provided on the surface where the protrusions contact the lower teeth.

[0017] Furthermore, the connector includes a buckle portion, one end of which is fixedly connected to the lower surface of the base portion, and the other end of the buckle portion is detachably connected to the lower surface of the base portion, and the buckle portion clamps and fixes the tracheal tube between the buckle portion and the lower surface of the base portion.

[0018] Furthermore, the snap-fitting portion is made of a hard and elastic material, and a screw hole is provided on the snap-fitting portion. The connecting piece also includes: a fastening bolt, which is threadedly connected to the screw hole, and the fastening bolt has a contact end, which can press against the outside of the tracheal tube, thereby tightening the tracheal tube between the snap-fitting portion and the lower surface of the base.

[0019] Furthermore, the base portion has a length direction, and the base portion has a first end and a second end in the length direction, the first end portion faces the outside of the oral cavity, the second end portion faces the airway, and the first end portion and the second end portion are both located inside the oral cavity, and there are multiple connecting parts, and the multiple connecting parts are sequentially arranged on the lower surface of the base portion along the length direction of the base portion.

[0020] Furthermore, the base portion is in the shape of a plate, and the lower surface of the base portion has an arc that is substantially consistent with the arc of the upper jaw.

[0021] Compared with the prior art, the beneficial effects of the utility model are as follows: the fixing part is fixed to the upper jaw in the oral cavity, and then endotracheal intubation is performed. After the endotracheal tube is inserted into place, the position of the endotracheal tube is fixed by using a connecting part so that it is located at the lower part of the fixing part and between the upper and lower teeth, thereby completing the fixation of the endotracheal tube. Subsequently, due to the special arrangement of a support part, the lower end of the support part abuts against the upper end of the lower teeth, thereby making a gap between the fixing part and the lower teeth, and due to the size setting of the support part, the height of the gap is not less than the outer diameter of the endotracheal tube, so that the endotracheal tube can pass through the gap. Through the above arrangement, the endotracheal tube that has completed the endotracheal intubation can bypass the soft tissues of the upper and lower lips and be connected to the ventilator, thereby avoiding the endotracheal tube being fixed to the perioral tissue and causing pressure damage to the perioral skin, thereby achieving a beneficial effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall bottom view schematic diagram of an embodiment;

[0023] Figure 2 It is an overall top view schematic diagram of an embodiment;

[0024] Figure 3 It is an overall front cross-sectional view of an embodiment;

[0025] Figure 4 The figure is a partial usage process diagram of an embodiment.

[0026] Description of reference numerals:

[0027] 1. Endotracheal tube; 2. Fixing assembly; 21. Fixing piece; 211. Base portion; 212. Elastic contact portion; 213. Upper lip pulling portion; 22. Supporting piece; 221. Protruding portion; 23. Connecting piece; 231. Snap-fit ​​portion; 232. Fastening bolt. DETAILED DESCRIPTION

[0028] The specific implementation of the utility model is described in detail below, but it should be understood that the protection scope of the utility model is not limited by the specific implementation. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The utility model provides a tracheal tube fixing device, which is used to assist the insertion and fixation of the tracheal tube 1, and includes a fixing component 2, wherein the fixing component 2 includes: a fixing piece 21, a supporting piece 22, a connecting piece 23, etc., wherein the fixing piece 21 includes an elastic contact portion 212, the elastic contact portion 212 is elastic, and the edge of the elastic contact portion 212 can enter the concave angle A between the upper jaw and the upper teeth, so that the fixing piece 21 is fixed to the upper jaw in the oral cavity; the supporting piece 22 is connected to the lower part of the fixing piece 21, and the lower end of the supporting piece 22 is against the upper end of the lower teeth, so that there is a gap between the fixing piece 21 and the lower teeth, and the height of the gap is not less than the outer diameter of the tracheal tube 1; the connecting piece 23 is connected to the lower part of the fixing piece 21, and the connecting piece 23 is detachably connected to the tracheal tube 1.

[0030] Specifically, please refer to Figure 1-Figure 3 When in use, tracheal intubation is performed first. After the tracheal tube 1 is inserted into place, the fixing member 21 is used to direct the elastic contact portion 212 toward the upper jaw, and the elastic contact portion 212 is set at the upper jaw. In this process, the edge of the elastic contact portion 212 can enter the concave angle A between the upper jaw and the upper teeth after shaping and designing. The elasticity of the elastic contact portion 212 is used to fix the fixing member 21 at the upper jaw in the oral cavity. Based on the elasticity of the elastic contact portion 212 and the fact that the upper jaw and the teeth are less prone to pressure trauma than the tongue, lips and soft tissues around the mouth, a fixing basis can be provided for the fixing component 2 at a relatively low cost. Then, the position of the tracheal tube 1 is fixed using the connecting member 23, so that it is located at the lower part of the fixing member and between the upper and lower teeth, thereby completing the fixation of the tracheal tube. Considering that the fixing position of the fixing member 21 is located in the oral cavity, in order to achieve the beneficial effect, a stable path to the outside world must be opened up for the tracheal tube 1 leading to the outside of the oral cavity, and pressure trauma to the device cannot be avoided. In order to prevent the main purpose of the invention from causing a counter-effect on the injury, a support member 22 is specially provided, and the lower end of the support member 22 is against the upper end of the lower teeth, so that a gap is formed between the fixing member 21 and the lower teeth, and because the size of the support member 22 is set so that the height of the gap is not less than the outer diameter of the endotracheal tube 1, the endotracheal tube 1 can pass through the gap. Through the above-mentioned arrangement, the endotracheal tube 1 that has completed the endotracheal intubation can bypass the soft tissues of the upper and lower lips and be connected to the ventilator, thereby avoiding the endotracheal tube 1 being fixed to the perioral tissues, causing pressure damage to the perioral skin and other surrounding soft tissues, thereby achieving a beneficial effect.

[0031] Furthermore, the setting of the fixing member 21 is refined. Specifically, the fixing member 21 includes a base portion 211 having a relative upper surface and a lower surface. The connecting member 23 and the supporting member 22 are both connected to the lower surface of the base portion 211. A groove is provided on the upper surface of the base portion 211, and the elastic contact portion 212 is fixedly connected in the groove.

[0032] The base 211 is the core connecting component of the device and does not contact the mucosa and tissue. It can be made of a material with greater rigidity, such as plastic, resin, and some suitable metal materials. At the same time, a groove is provided on its upper surface to accommodate and fix the elastic mounting portion 212. The support member 22 is arranged on the lower surface of the base 211 to abut against the lower teeth. In some embodiments, the support member 22 and the base 211 are in a split fixed connection form, such as bonding, screw connection, etc. In other embodiments, the support member 22 and the base 211 are an integrated structure, and the fixed connection relationship is achieved by an integrated injection molding method. In this method, the support member 22 and the base 211 should be a hard plastic and resin material with a hardness less than that of the teeth, so as to avoid damaging the tooth surface. Other conventional connection means that are available and suitable to those skilled in the art can also be used in other various embodiments, which will not be repeated here.

[0033] Furthermore, the elastic contact portion 212 is made of two-component silicone rubber, and the elastic contact portion 212 has a plastic state at the beginning of the two-component mixing and a solidified elastic state formed after a period of mixing. When the elastic contact portion 212 is in the plastic state, it is in the groove, and the upper part of the elastic contact portion 212 in the plastic state is filled into the maxillary recess and the undercut angle A between the maxillary and the upper teeth, so that the elastic contact portion can be fixed in the maxillary in the oral cavity when it is in the solidified elastic state; the groove is provided with a plurality of limiting slots on the surface facing the elastic contact portion 212, and the lower part of the elastic contact portion 212 in the plastic state is filled into the limiting slots so that the elastic contact portion 212 is fixedly connected to the groove.

[0034] In this embodiment, the two-component silicone rubber of the elastic contact part 21 is an AB agent silicone rubber material commonly used in conventional dental / stomatological techniques, which is usually used to achieve molding or filling effects, and is usually composed of two components, A and B. The A component material generally includes vinyl polydimethylsiloxane, a platinum complex catalyst, and white carbon black reinforcing filler, and the B component material generally includes vinyl polydimethylsiloxane, a hydrogen-containing polydimethylsiloxane crosslinker, and white carbon black reinforcing filler.

[0035] During operation, the two components A and B are mixed in a ratio of 1:1. The substance formed at the beginning of the mixing is the elastic contact part 212 in a plastic state. At this time, the elastic contact part 212 is in a plastic, plasticine-like state with flexibility and elasticity. The lower part of the elastic contact part 212 in a plastic state is squeezed and filled into the groove. In this process, the lower part of the elastic contact part 212 will be squeezed into each limiting slot, and the upper part of the elastic contact part 212 presents a surplus and protrudes outside the groove. , the base part 211 containing the plastic elastic contact part 212 is buckled against the patient's upper jaw, and the surplus part of the elastic contact part 212 protruding from the groove can be placed into the maxillary depression and the undercut angle A between the maxillary and upper teeth by relying on its plasticity (non-interference fit). Due to the plastic state of the elastic contact part 212 at this time, the contact between the elastic contact part 212 and the maxillary depression and the undercut angle A between the maxillary and upper teeth is a contact form in which the contact surfaces perfectly match and fit each other.

[0036] The two-component silicone rubber in this embodiment will begin to solidify and denature after 5 minutes, and finally form an elastic solid state without plasticity. At this time, the elastic contact portion 212 is in a solidified elastic state. Since its contact with the maxillary depression and the undercut angle A between the maxillary and upper teeth is a contact form in which the contact surface perfectly matches and fits the contact surface, there is basically no squeezing and deformation of these parts, thereby reducing the risk of pressure trauma at these contact positions. At the same time, the edge of the elastic contact portion 212 is supported by the undercut angle A between the maxillary and upper teeth, and appears to be hanging upside down on the maxillary, thereby achieving the technical effect of fixing the fixing part 21 on the maxillary.

[0037] In each embodiment, the limiting slot can be a hole in various forms, and the aperture of the limiting slot on the inner surface of the groove is smaller than the aperture of the inner cavity of the base 211. Each embodiment can adopt common forms to set the limiting slot, such as dovetail groove, ball socket groove, etc. Other similar conventional technical means that can be implemented will not be repeated.

[0038] Furthermore, the fixing member 21 also includes: an upper lip pulling portion 213, which is fixedly connected to one end of the base portion 211 facing outside the oral cavity, and one end of the upper lip pulling portion 213 away from the base portion 211 can press against the upper lip to push the upper lip upward so that the upper lip does not contact the tracheal tube 1.

[0039] Furthermore, the upper lip pulling portion 213 is made of an elastic and flexible material. In this embodiment, it is made of the two-component silicone rubber in the above embodiment, and in other embodiments, it can be made of other soft materials; a protrusion is connected to the end of the upper lip pulling portion 213 away from the base portion 211, and the protrusion is used to press against the upper lip to push the upper lip upward. The contact portion between the protrusion and the upper lip has a contact curved surface, and the contact curved surface is configured to be able to fit in contact with the surface of the upper lip.

[0040] The above arrangement further reduces the risk of the endotracheal tube 1 causing pressure trauma to the perioral tissue.

[0041] Furthermore, the support member 22 needs to be supported between the lower teeth and the fixing member 21, and a gap needs to be left for the tracheal cannula 1 to pass through, so the relevant features of the support member 22 are refined. Specifically, the support member 22 includes: two protrusions 221, the two protrusions 221 are respectively fixedly connected to the left and right sides of the base 211, and the protrusions 221 are located on the lower surface of the base 211, the lower ends of the protrusions 221 are used to abut against the lower teeth on both sides, the height of the protrusions 221 is not less than the outer diameter of the tracheal cannula 1, and friction lines are provided on the surface where the protrusions 221 contact the lower teeth. The two protrusions 221 correspond to part of the lower teeth on the left and right sides, respectively, and the gap for the tracheal cannula 1 to pass through is located between the two protrusions 221.

[0042] Furthermore, the connector 23 includes: a buckle portion 231, one end of which is fixedly connected to the lower surface of the base portion 211, and the other end of the buckle portion 231 is detachably connected to the lower surface of the base portion 211. The buckle portion 231 clamps and fixes the tracheal tube 1 between the buckle portion 231 and the lower surface of the base portion 211, so as to facilitate the installation and removal of the tracheal tube 1. In this embodiment, the other end of the buckle portion 231 is detachably connected to the lower surface of the base portion 211 by a snap connection. In other embodiments, common detachable connection methods such as magnetic connection, Velcro adhesion, and keyhole connection can also be used.

[0043] Furthermore, the protective effect of the device against pressure trauma is a technical effect achieved based on the effective fixation of the tracheal tube 1. Therefore, in order to further improve the fixing effect of the connector 23 on the tracheal tube 1, thereby improving the protective effect against pressure trauma, in particular, the buckle portion 231 is made of a hard and elastic material, a screw hole is provided on the buckle portion 231, and the connector 23 further includes: a fastening bolt 232, the fastening bolt 232 is threadedly connected in the screw hole, the fastening bolt 232 has a contact end, and the contact end can abut against the outside of the tracheal tube 1, thereby tightening the tracheal tube 1 between the buckle portion 231 and the lower surface of the base portion 211. The buckle portion 231 in this embodiment is a belt structure, and in other embodiments, it can also be a common structural form such as a zigzag block, an elastic sheet, a curved sheet, a micro belt, etc.

[0044] In order to further enhance the fixing effect of the connecting member 23 on the endotracheal tube 1, thereby enhancing the protective effect against pressure trauma, the base portion 211 has a length direction, and the base portion 211 has a first end and a second end in the length direction, the first end faces the outside of the oral cavity, the second end faces the airway, and both the first end and the second end are located in the oral cavity. There are multiple connecting members 23, and the multiple connecting members 23 are sequentially arranged on the lower surface of the base portion 211 along the length direction of the base portion 211.

[0045] In the present embodiment, three connectors 23 are used to achieve a good and suitable fixing effect. In other embodiments, the number of connectors 23 can be changed according to needs and specific designs. For example, for a smaller-sized device for children, the number of connectors 23 can be appropriately reduced to reduce the overall volume of the device. For another example, in a mass production environment, the number of connectors 23 can be appropriately reduced to reduce production costs.

[0046] Furthermore, based on the above embodiment, the base 211 is in the shape of a plate, and the lower surface of the base 211 has a curvature that is roughly consistent with the curvature of the maxilla, so that the portion of the tracheal tube 1 connected by multiple connectors 23 can present a curvature that is roughly consistent with the curvature of the maxilla, thereby further avoiding contact between the tracheal tube 1 and the tongue and further reducing the risk of pressure trauma.

[0047] In other embodiments, the base 211 can be a block shape with a smooth curved surface with an upper groove, or an arc-shaped rigid thin film structure with a recessed area as a groove, in a way that can be thought of by those skilled in the art to meet different appearance, cost, focus effects and special design requirements.

[0048] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tracheal tube fixing device for assisting tracheal intubation (1) intubation surgery, characterized in that: include: A fixing component (2), the fixing component (2) comprising: A fixing member (21), the fixing member (21) comprising an elastic contact portion (212), the elastic contact portion (212) having elasticity, the edge of the elastic contact portion (212) being able to enter into an undercut angle A between the upper jaw and the upper teeth, so that the fixing member (21) is fixed to the upper jaw in the oral cavity; A support member (22), the support member (22) being connected to the lower part of the fixing member (21), the lower end of the support member (22) being against the upper end of the lower teeth, so that a gap is provided between the fixing member (21) and the lower teeth, the height of the gap being not less than the outer diameter of the endotracheal tube (1); A connecting piece (23), the connecting piece (23) is connected to the lower part of the fixing piece (21), and the connecting piece (23) is detachably connected to the endotracheal tube (1).

2. A tracheal tube fixing device as claimed in claim 1, characterized in that: The fixing member (21) comprises a base portion (211), the base portion (211) having an upper surface and a lower surface opposite to each other, the connecting member (23) and the supporting member are both connected to the lower surface of the base portion (211), the upper surface of the base portion (211) is provided with a groove, and the elastic contact portion (212) is fixedly connected in the groove.

3. A tracheal tube fixing device as claimed in claim 2, characterized in that: The elastic contact portion (212) is made of two-component silicone rubber. The elastic contact portion (212) has a plastic state when the two components are initially mixed and a solidified elastic state formed after a period of mixing. When the elastic contact portion (212) is in the plastic state, it is in the groove. The upper portion of the elastic contact portion (212) in the plastic state is filled into the maxillary concave portion and the undercut angle A between the maxillary portion and the upper teeth, so that the elastic contact portion can be fixed to the maxillary portion in the oral cavity when it is in the solidified elastic state. The groove is provided with a plurality of limiting slots on a surface facing the elastic contact portion (212), and the lower portion of the elastic contact portion (212) in a plastic state is filled into the limiting slots so that the elastic contact portion (212) is fixedly connected to the groove.

4. A tracheal tube fixing device as claimed in claim 3, characterized in that: The fixing member (21) further comprises: an upper lip pulling portion (213), wherein the upper lip pulling portion (213) is fixedly connected to one end of the base portion (211) facing outside the oral cavity, and one end of the upper lip pulling portion (213) away from the base portion (211) can abut against the upper lip to push the upper lip upward, so that the upper lip does not contact the endotracheal tube (1).

5. A tracheal tube fixing device as claimed in claim 4, characterized in that: The upper lip pulling portion (213) is made of elastic material; A protrusion is connected to one end of the upper lip pulling portion (213) away from the base portion (211), and the protrusion is used to abut against the upper lip to push the upper lip upward. The contact portion between the protrusion and the upper lip has a contact curved surface, and the contact curved surface is configured to be able to fit in contact with the surface of the upper lip.

6. A tracheal tube fixing device as claimed in claim 3, characterized in that: The support member (22) comprises: two protrusions (221), the two protrusions (221) are respectively fixedly connected to the left and right sides of the base portion (211), and the protrusions (221) are located on the lower surface of the base portion (211), the lower ends of the protrusions (221) are used to abut against the lower teeth on both sides, the height of the protrusions (221) is not less than the outer diameter of the endotracheal tube (1), and friction patterns are arranged on the surface of the protrusions (221) in contact with the lower teeth.

7. A tracheal tube fixing device as claimed in claim 4, characterized in that: The connecting member (23) comprises: a buckling portion (231), one end of which is fixedly connected to the lower surface of the base portion (211), and the other end of the buckling portion (231) is detachably connected to the lower surface of the base portion (211), and the buckling portion (231) clamps and fixes the endotracheal tube (1) between the buckling portion (231) and the lower surface of the base portion (211).

8. A tracheal tube fixing device as claimed in claim 7, characterized in that: The buckling portion (231) is made of a hard and elastic material, and a screw hole is provided on the buckling portion (231). The connecting member (23) further comprises: a fastening bolt (232), wherein the fastening bolt (232) is threadedly connected in the screw hole, and the fastening bolt (232) has a contact end, and the contact end can abut against the outer side of the tracheal tube (1), thereby tightening the tracheal tube (1) between the buckling portion (231) and the lower surface of the base portion (211).

9. A tracheal tube fixing device as claimed in claim 8, characterized in that: The base portion (211) has a length direction, and the base portion (211) has a first end and a second end in the length direction, the first end faces the outside of the oral cavity, and the second end faces the airway, and the first end and the second end are both located in the oral cavity, and there are multiple connecting pieces (23), and the multiple connecting pieces (23) are sequentially arranged on the lower surface of the base portion (211) along the length direction of the base portion (211).

10. The endotracheal tube fixing device according to claim 9, characterized in that: The base portion (211) is in the shape of a plate, and the lower surface of the base portion (211) has an arc that is substantially consistent with the arc of the upper jaw.

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