Abstract:
The present invention relates to a layered soft palate support and an implantation method for treating sleep apnea/hypopnea syndrome or snoring. The layered soft palate support is a flat implant made of a material capable of being implanted into a human body for a long term, and includes a hard palate connecting end and a support. The support is a layered structure formed by stacking two or more layers of supporting plates and capable of being inserted into a soft palate, and is removably or irremovably fixed to the hard palate connecting end. The hard palate connecting end has a connecting structure connected with a hard palate, and is fixed to the hard palate through the connecting structure. The support is implanted into a muscular layer of the soft palate, and is inserted into the soft palate by a length equal to ⅕ to ⅘ of its total length.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a layered soft palate support, and more particularly to a layered soft palate support and an implantation method for treating adult obstructive sleep apnea/hypopnea syndrome (OSAHS). 
         [0003]    2. Related Art 
         [0004]    Adult OSAHS is a sleep breathing disorder with clinical features of snoring and apnea caused by upper airway collapse and obstruction during sleep. The morbidity of OSAHS is about 4% among adult men and about 2% among adult women even according to the lowest diagnosis criteria, and OSAHS presents a serious threat to the life and health of patients. 
         [0005]    As for the pathogenesis of OSAHS, it is generally considered that the main cause is that, pharyngeal muscles for maintaining the upper airway open relax during sleep, resulting in soft tissue collapse and obstruction, and the plane of obstruction is usually located in the soft palate, tonsil, and tongue root. Many methods for treating OSAHS exist, which include two types, that is, non-surgical treatment and surgical treatment. 
         [0006]    Methods of Non-Surgical Treatment Mainly Include: 
         [0007]    1. Continuous Positive Airway Pressure (CPAP), in which a breathing machine capable of continuously generating a positive pressure is closely connected with the nose and face of a patient via a nasal mask, so as to prevent collapse and obstruction of the soft tissues of the airway during sleep. Though the method has a good effect, it is difficult for approximately 2/3 of the patients to adapt to the machine, and they cannot sleep when wearing the machine. 
         [0008]    2. Oral appliance. A device is placed in an oral cavity to move forward the mandible or pull forward the tongue, so as to enlarge the pharyngeal cavity and release the airway obstruction during sleep. The method has many types and produces a certain effect, but most patients cannot adapt to it. The oral appliance leads to irritation and foreign body sensation, causing that the user cannot fall asleep, and may have temporo-mandibular joint injury with long term use. 
         [0009]    Methods of Surgical Treatment Mainly Include: 
         [0010]    1. Radiofrequency ablation, which is also referred to as low-temperature plasma radiofrequency ablation, and is a minimally invasive surgical method. An electrode is penetrated into the soft tissues which cause airway obstruction, such as the soft palate, tonsil, and tongue root, and is electrified to induce tissue coagulation, necrosis, fibrosis, and contraction by heating. The method has a certain therapeutic effect, is effective for a slight case, has a poor long-term efficacy, and is ineffective for serious patients. 
         [0011]    2. Palatopharyngoplasty. Since Fujita improved the Palatopharyngoplasty of Ikematus, a Japanese scholar, into uvulopalatopharyngoplasty (UPPP) and introduced it to the US in 1981, various improved technologies based on UPPP, including Simmons method, Fairbanks method, Dickson method, Woodson method, Z-palatoplasty (ZPP), uvulopalatal flap (UPF), H-uvulopalatopharyngoplasty (H-UPPP) have been successively reported in literatures, which made a great contribution to symptom alleviation and recovery of OSAHS patients. Countless patients benefit from the surgical treatment solution. However, in terms of long-term effect, since the mucous membrane and soft palate tissue structure are excessively removed, functional muscles are injured, resulting in complications of nasal regurgitation during swallowing, rhinolalia aperta, and nasopharyngeal stenosis and atresia. It is the leading edge and focus for the research and development of OSAHS treatment technologies nowadays to develop a method and corresponding surgical instruments which create a smaller wound or perform surgical treatment in a minimally invasive manner. 
         [0012]    Based on the above, though generating a certain effect, the existing technologies and methods for treating OSAHS and snoring still have many defects, and have a poor long-term effect. Therefore, it is necessary to develop a new method and design a new instrument to treat OSAHS and snoring, in which the new method should create a wound as small as possible, and the new instrument should be safe, effective, simple, and reliable. 
       SUMMARY OF THE INVENTION 
       [0013]    Research reports and clinical experience indicate that, the relaxation and collapse of the soft palate portion is one of main causes of snoring and OSAHS. The inventor has disclosed, in PCT/CN2009/072328 and PCT/CN2009/074959, two soft palate supports of different structures and corresponding implantation methods. The principle of such technologies for treating OSAHS lies in that: supported by a hard palate, a support inserted into a muscular layer of a soft palate is used to lift the collapsed soft palate, thereby achieving the objective of minimally invasive surgical treatment of snoring and OSAHS. Since the support inserted into the muscular layer of the soft palate needs to swing along with the soft palate during swallowing, a high requirement is imposed on the fatigue resistance of the support. How to improve the fatigue resistance of the soft palate support becomes a key to the improvement of the service life of the soft palate support. The present invention is further improvement and optimization of the foregoing solutions, and mainly improves the fatigue life of the support. 
         [0014]    The present invention provides a layered soft palate support is a flat implant made of a material capable of being implanted into a human body for a long term, and includes: a hard palate connecting end, configured with a connecting structure connected with a hard palate; and a support, being a layered structure formed by stacking two or more layers of supporting plates and capable of being inserted into a soft palate, and removably or irremovably fixed to the hard palate connecting end. 
         [0015]    Further, the hard palate connecting end has a length L 1  of 5 to 30 mm, the support has a length L 2  of 15 mm to 60 mm, and a lifting angle β of the support, that is, an angle between a plane of the hard palate and a most distal end of the support, is 30° to 80°. 
         [0016]    A bending radius R 1  of a near end of the support, that is, close to the hard palate connecting end, is 10 mm to 100 mm; a bending radius R 2  of a distal end of the support, that is, away from the hard palate connecting end, is 20 mm to 120 mm; and the near end of the support has a thickness δ 1  of 0.5 mm to 1.8 mm, and the distal end has a thickness δ 2  of 0.1 mm to 0.8 mm. 
         [0017]    A sweepback angle γ of a warped end at a distal end of the support, that is, an angle γ between a plane of the supporting plate at the distal end of the support and a plane of the warped end, is 0° to 75°, and preferably 20° to 50°. 
         [0018]    The supporting plate is a thin-walled plate made of a medical-purpose elastic material and having a curvature matching the shape of the soft palate, and the thin-walled plate has a thickness of 0.01 mm to 1.5 mm, and preferably 0.01 mm to 0.8 mm. 
         [0019]    The supporting plate has a uniform or non-uniform wall thickness; and when the supporting plate has a non-uniform wall thickness, the larger the length of the supporting plate is, the larger the amplitude of swing is, and the smaller the wall thickness is. 
         [0020]    The number M of layers of the thin-walled supporting plates stacked at a near end of the layered soft palate support (that is, close to the hard palate connecting end) is greater than the number N of layers of the thin-walled supporting plates stacked at a distal end of the layered soft palate support (that is, away from the hard palate connecting end). 
         [0021]    In the support, the thin-walled supporting plates may be stacked in various manners stacked to form the layered structure, which are mainly as follows: 
         [0022]    (1) The supporting plates of the layered structure are sequentially arranged in a descending order of length, front supporting plates, that is, the supporting plates close to teeth are long, and rear supporting plates, that is, the supporting plates close to a posterior pharyngeal wall are short. 
         [0023]    (2) The supporting plates of the layered structure are sequentially arranged in an ascending order of length, front supporting plates, that is, the supporting plates close to teeth are short, and rear supporting plates, that is, the supporting plates close to a posterior pharyngeal wall are long. 
         [0024]    (3) The supporting plates of the layered structure are arranged in a sandwiched configuration, the length of a frontmost supporting plate is near or equal to the length of a rearmost supporting plate, and intermediate supporting plates are sequentially arranged in a descending order of length, are symmetrically arranged or are sequentially arranged in an ascending order of length. 
         [0025]    (4) When the supporting plates of the layered structure are arranged in a sandwiched configuration, the frontmost supporting plate and the rearmost supporting plate are formed by bending a single plate into a U-shape, and the intermediate supporting plates are sequentially arranged in a descending order of length, are symmetrically arranged or are sequentially arranged in an ascending order of length. 
         [0026]    In addition, the supporting plate is configured with through holes, for facilitating growth and coverage of tissues, to fix the support into the muscular layer of the soft palate. 
         [0027]    Further, the layered soft palate support includes a blunt edge. The blunt edge may be designed in various ways, which are mainly as follows: 
         [0028]    The blunt edge is a coil spring structure, wound in through holes at an edge of the supporting plate, to connect the supporting plates. 
         [0029]    The layered soft palate support includes a blunt edge and the blunt edge includes more than one coil spring segment, wound in through holes of the supporting plate, to connect the supporting plates. 
         [0030]    The blunt edge is a rivet-type structure or a concave-convex position-limiting engagement structure. 
         [0031]    The layered soft palate support includes a position-limiting mechanism for limiting a distance between the layers of the supporting plates of the layered support, the supporting plates are constrained by the position-limiting mechanism, the supporting plate has a variable degree of curvature, a gap between the layers of the supporting plates is limited by the position-limiting mechanism, and the gap is smaller than 2 mm. The limiting mechanism may be designed in various ways, which are mainly as follows: 
         [0032]    (1) The limiting mechanism is a locking pin of a concave-convex position-limiting engagement structure, and formed by a lock nut and a pin. 
         [0033]    (2) The limiting mechanism is formed by a limiting groove and a limiting plate, and the limiting plate is part of an edge of one of the supporting plates, and is bent to form a rectangular or U-shaped slot opening serving as the limiting groove. 
         [0034]    The layered soft palate support includes an adjustment mechanism capable of adjusting the degree of curvature of the supporting plate. The adjustment mechanism may be designed in various ways, which are mainly as follows: 
         [0035]    (1) The adjustment mechanism is a wedge-shaped adjustment mechanism. The degree of curvature of the support can be changed by adjusting the wedge-shaped adjustment mechanism. When the wedge-shaped adjustment mechanism is moved toward a near end, the degree of curvature of the support is increased, so as to increase a lifting degree of the soft palate; and when the wedge-shaped adjustment mechanism is moved toward a distal end, the degree of curvature of the support is reduced, so as to reduce the lifting degree of the soft palate. 
         [0036]    (2) The adjustment mechanism is an adjustment washer. When the height of the adjustment washer is increased, the degree of curvature of the support is increased, so as to increase a lifting degree of the soft palate; and when the height of the adjustment washer is reduced, the degree of curvature of the support is reduced, so as to reduce the lifting degree of the soft palate. 
         [0037]    The medical-purpose elastic material of the supporting plate is selected from a group consisting of amorphous alloy (also referred to as metallic glass), titanium-zirconium-niobium alloy, titanium-nickel shape memory alloy, titanium and titanium alloy, medical grade stainless steel, and medical grade elastic non-metallic materials. 
         [0038]    Further, the amorphous alloy has excellent elasticity and excellent fatigue resistance, and is selected from a group consisting of Ti-based amorphous metal materials, Zr-based amorphous metal materials, Nb-based amorphous metal materials, and Fe-based amorphous metal materials. 
         [0039]    The connecting structure of the hard palate connecting end is a through hole through which the hard palate connecting end is fixed to the hard palate by using a screw. The connecting structure of the hard palate connecting end generally adopts a through hole structure, and through the through hole, the hard palate connecting end can be fixed to the hard palate by using a screw. 
         [0040]    In addition, the hard palate connecting end includes a fixing rivet for riveting the supporting plates located at the hard palate connecting end, to facilitate product mounting. 
         [0041]    The implantation method of the layered soft palate support according to the present invention is: making a small incision at a junction of a soft palate and a hard palate, and inserting a support into a muscular layer at a middle portion of the soft palate; and passing a medical bone nail through a through hole on a hard palate connecting end to fix the hard palate connecting end to the hard palate. 
         [0042]    The support is inserted into the soft palate by a length equal to ⅕ to ⅘, and most preferably, ⅔ to ¾, of a total length of the soft palate. 
         [0043]    Further, the layered soft palate support may be implanted in two stages. In a first stage, the hard palate connecting end of the layered soft palate support is implanted first, and the bone nail is passed through the through hole on the hard palate connecting end to fix the hard palate connecting end to the hard palate; and one month to three months later, the hard palate connecting end is firmly fixed to the hard palate, and at this time, a second stage surgery is performed: making a small incision at the junction of the soft palate and the hard palate, inserting one end of the support into the muscular layer at the middle portion of the soft palate, and fixing the other end of the support to the hard palate connecting end. 
         [0044]    The present invention relates to a layered soft palate support and an implantation method for treating sleep apnea/hypopnea syndrome or snoring. The layered soft palate support is a flat implant made of a material capable of being implanted into a human body for a long term, and includes a hard palate connecting end and a support. The support is a layered structure formed by stacking two or more layers of supporting plates and capable of being inserted into a soft palate, and is removably or irremovably fixed to the hard palate connecting end. The hard palate connecting end is configured with a connecting structure connected with a hard palate, and the hard palate connecting end is fixed to the hard palate through the connecting structure. The support is implanted into a muscular layer of the soft palate, and is inserted into the soft palate by a length equal to ⅕ to ⅘ of a total length of the soft palate. 
         [0045]    The use of the layered structure formed by stacking thin-walled plates not only improves the adaptability of the support but also significantly improves the fatigue fracture resistance of the support while ensuring the supporting force. 
         [0046]    Since the layered soft palate support can effectively lift the soft palate collapsing during sleep and relieve an upper airway obstruction condition, objectives of treating OSAHS and snoring can be achieved. 
         [0047]    Clinical application has proved that, the method and implanted instrument of the present invention have the advantages of small wound, few complications, reliable efficacy, and great comfort, thereby realizing the objective of minimally invasive treatment. 
         [0048]    In particular, for implantation of the layered soft palate support of the present invention, during clinical implantation, the degree of curvature of the support is adjusted as required by adjusting the position of the wedge-shaped adjustment mechanism or by adjusting the height of the adjustment washer, so that the lifting degree of the soft palate being supported can be adjusted within a certain range, so as to achieve optimal treatment effect and comfort. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0049]      FIG. 1  is a schematic structural view of a layered soft palate support in a descending configuration of the present invention fixed to a hard palate; 
           [0050]      FIG. 2  is a schematic structural view of a layered soft palate support in an ascending configuration of the present invention fixed to a hard palate; 
           [0051]      FIG. 3  is a schematic structural view of a layered soft palate support in a symmetric configuration of the present invention to a hard palate; 
           [0052]      FIG. 4  is a schematic structural view of a layered soft palate support in a sandwiched descending configuration of the present invention fixed to a hard palate; 
           [0053]      FIG. 5  is a schematic structural view of a layered soft palate support in a sandwiched symmetric configuration of the present invention fixed to a hard palate; 
           [0054]      FIG. 6  is a schematic structural view of a layered soft palate support in a sandwiched ascending configuration of the present invention fixed to a hard palate; 
           [0055]      FIG. 7  is a schematic structural view of a layered soft palate support with one equal-length layer of the present invention; 
           [0056]      FIG. 8  is a schematic structural view of a layered soft palate support with two equal-length layers of the present invention; 
           [0057]      FIG. 9  is a three-dimensional schematic structural view of a U-shaped layered soft palate support in a sandwiched descending configuration of the present invention; 
           [0058]      FIG. 9-1  is a side view of  FIG. 9 ; 
           [0059]      FIG. 10  is a three-dimensional schematic structural view of a layered soft palate support with a blunt edge being a single wire-wound coil spring of the present invention; 
           [0060]      FIG. 11  is a three-dimensional schematic structural view of a layered soft palate support with a blunt edge being a coil spring segment of the present invention; 
           [0061]      FIG. 12  is a three-dimensional schematic structural view of a layered soft palate support with a blunt edge being flanges of a concave-convex position-limiting engagement structure of the present invention; 
           [0062]      FIG. 12-1  is a front view of  FIG. 12 ; 
           [0063]      FIG. 12-2  is a side view of  FIG. 12 ; 
           [0064]      FIG. 12-3  is a rear view of  FIG. 12 ; 
           [0065]      FIG. 12-4  is an A-A cross-sectional view of  FIG. 12 ; 
           [0066]      FIG. 12-5  is an enlarged view of region C in  FIG. 12-4 ; 
           [0067]      FIG. 12-6  is a B-B cross-sectional view of the flanges of a concave-convex position-limiting engagement structure in  FIG. 12-4 ; 
           [0068]      FIG. 13  is a schematic structural view of a layered soft palate support including a position-limiting mechanism of the present invention; 
           [0069]      FIG. 13-1  is a schematic structural view of a rivet-type limiting mechanism; 
           [0070]      FIG. 13-2  is a schematic structural view of a concave-convex engagement limiting mechanism; 
           [0071]      FIG. 14  is a three-dimensional schematic structural view of a layered soft palate support including a U-shaped slot type limiting mechanism of the present invention; 
           [0072]      FIG. 14-1  is a front view of  FIG. 14 ; 
           [0073]      FIG. 14-2  is a side view of  FIG. 14 ; 
           [0074]      FIG. 14-3  is a rear view of  FIG. 14 ; 
           [0075]      FIG. 14-4  is a schematic structural view of a warped end in  FIG. 14 ; 
           [0076]      FIG. 15  is a schematic structural view of a removable layered soft palate support including an adjustment washer of the present invention; 
           [0077]      FIG. 15-1  is a front view of  FIG. 15 ; 
           [0078]      FIG. 16  is a schematic structural view of a removable layered soft palate support including a wedge-shaped adjustment mechanism of the present invention; 
           [0079]      FIG. 16-1  is a front view of  FIG. 16 ; 
           [0080]      FIG. 17  is a schematic structural view of a soft palate support of the present invention capable of being implanted in stages after being assembled; 
           [0081]      FIG. 17-1  is an exploded view of  FIG. 17 . 
           [0082]      FIG. 17-2  is a schematic structural view of mounting a hard palate connecting end in a first stage surgery of  FIG. 17 ; and 
           [0083]      FIG. 17-3  is a schematic structural view of mounting a support in a second stage surgery of  FIG. 17 . 
       
    
    
       [0084]    The meanings of the serial numbers in the above drawings are as follows:  1 . hard palate connecting end,  2 . support,  3 . layered soft palate support of the present invention,  5 . bone nail,  6 . hard palate,  7 . soft palate,  8 . screw;  11 . connecting structure on the hard palate connecting end and connected with the hard palate,  111 . connecting through hole;  21 . supporting plate,  211 . warped end on the supporting plate;  22 . through hole on the supporting plate;  23 . blunt edge of the supporting plate,  231 . spring segment,  232 . flange of a concave-convex position-limiting engagement structure;  24 . limiting mechanism,  241 . lock nut,  242 . lock screw,  243 . limiting plate,  244 . limiting groove;  25 . adjustment mechanism,  251 . wedge-shaped adjustment mechanism,  252 . adjustment washer;  26 . fixing rivet; β. lifting angle of the support, γ. sweepback angle of the warped end at the distal end of the support; L 1 . length of the hard palate connecting end, L 2 . length of the support ( 2 ), δ 1 . thickness of the near end of the support, δ 2 . thickness of the distal end of the support; R 1 . bending radius of the near end of the support, R 2 . bending radius of the distal end of the support; M. number of layers of supporting plates stacked at the near end of the soft palate support, N. number of layers of supporting plates stacked at the distal end of the soft palate support; P 1 . the first equal-length layer numbered from front to back of the layered structure of the support; P 2 . the second equal-length layer numbered from front to back of the layered structure of the support; P 3 . the third equal-length layer numbered from front to back of the layered structure of the support; P 4 . the fourth equal-length layer numbered from front to back of the layered structure of the support; P 5 . the fifth equal-length layer numbered from front to back of the layered structure of the support. 
       DETAILED DESCRIPTION OF THE INVENTION 
       [0085]    The principle of treating OSAHS according to the present invention lies in that: supported by a hard palate  6 , a support  2  inserted into a muscular layer of a soft palate is used to lift the collapsed soft palate  7 , thereby achieving the objective of treating OSAHS. See  FIG. 15  to  FIG. 15-3 . 
         [0086]    Since the support  2  inserted into the muscular layer of the soft palate needs to swing along with the soft palate during swallowing, a high requirement is imposed on the fatigue resistance of the support  2 . How to improve the fatigue resistance of the soft palate support  2  becomes a key to the improvement of the service life of the soft palate support  2 . 
         [0087]    In view of how to improve the fatigue resistance of the soft palate support  2 , a technical solution of improving the fatigue life of the soft palate support is disclosed in the present invention, that is, a layered structure of supporting plates that is formed by stacking thin-walled plates is used as the support  2 , which not only improves the adaptability of the support but also significantly improves the fatigue fracture resistance of the support while ensuring the supporting force. 
         [0088]    When a single-layer titanium-nickel shape memory alloy sheet having a thickness of 0.6 mm after heat treatment is used as the soft palate support, the fatigue life is about 3×10 6  cycles, and calculated based on one swallow per minute, the fatigue life is about 5 years. 
         [0089]    When the thickness decreases to 0.1 mm, and a 0.1 mm single-layer titanium-nickel shape memory alloy sheet after the same heat treatment process is used as the soft palate support, the fatigue life is about 5×10 7  cycles, and calculated based on one swallow per minute, the fatigue life is about 95 years. 
         [0090]    When a Ti-based amorphous metal material, also referred to as Ti-based metallic glass, having a thickness of 0.1 mm is used, the fatigue life is greater than 1×10 8  cycles, and the fatigue life is about 190 years. 
         [0091]    It can be seen that, the layered soft palate support formed by stacking thin-walled plates surely can meet clinical requirements. 
         [0092]    Embodiment 1: a Layered Soft Palate Support in a Descending Configuration of the Present Invention 
         [0093]    Referring to  FIG. 1 , this embodiment shows a layered soft palate support in a descending configuration of the present invention. 
         [0094]    For ease of description, it is defined that supporting plates  21  close to teeth are front supporting plates  21 , supporting plates  21  close to a posterior pharyngeal wall are rear supporting plates  21 , and supporting plates  21  of the same length are supporting plates  21  of an equal-length layer. 
         [0095]    In this embodiment, the support  2  includes a total of five equal-length layers of supporting plates  21 , namely, P 1 , P 2 , P 3 , P 4  and P 5  layers, where the P 1  layer and the P 2  layer are each formed by two layers of supporting plates  21 . Each of the thin-walled supporting plates  21  of the P 1  layer and the P 2  layer has a thickness of 0.1 mm, and each of the thin-walled supporting plates  21  of the P 3  layer, the P 4  layer and the P 5  layer has a thickness of 0.2 mm. In this way, the support  2  has an overall thickness δ 1  of 1 mm at a near end, that is, close to the hard palate connecting end  1 ; and the support  2  has a thickness δ 2  of 0.2 mm at a distal end. The support  2  has a length L 2  of 30 mm. 
         [0096]    A frontmost supporting plate  21  is the longest, a rearmost supporting plate  21  is the shortest, the lengths of the supporting plates  21  gradually decrease from front to back, and the layers of the supporting plates  21  have lengths satisfying P 1 &gt;P 2 &gt;P 3 &gt;P 4 &gt;P 5 , and are arranged in a descending order of length and sequentially stacked to form the layered soft palate support  2 . 
         [0097]    The geometrical shape and dimension of the layered soft palate support  3  of the present invention vary with different specific conditions of patients. See  FIG. 14-1  and  FIG. 14-4 . Generally, the hard palate connecting end  1  has a length L 1  of 5 to 30 mm, and the support  2  has a length L 2  of 15 mm to 60 mm; a lifting angle β of the support  2 , that is, an angle between a plane of the hard palate and a most distal end of the support  2 , is 30° to 80°; a bending radius R 1  of the near end of the support  2 , that is, close to the hard palate connecting end  1 , is 10 mm to 100 mm; a bending radius R 2  of the distal end of the support  2 , that is, away from the hard palate connecting end  1 , is 20 mm to 120 mm; a sweepback angle γ of a warped end  211  at the distal end of the support  2 , that is, an angle γ between a plane of the supporting plate  21  at the distal end of the support  2  and a plane of the warped end  211 , is 0° to 75°, and preferably 20° to 50°; the near end of the support  2  has a thickness δ 1  of 0.5 mm to 1.8 mm, and the distal end has a thickness δ 2  of 0.1 mm to 0.8 mm. 
         [0098]    The supporting plate  21  is a thin-walled plate made of a medical-purpose elastic material and having a curvature matching the shape of the soft palate, and the thin-walled plate has a thickness of 0.01 mm to 1.5 mm, and preferably 0.01 mm to 0.8 mm. 
         [0099]    The medical-purpose elastic material of the supporting plate  21  is selected from a group consisting of amorphous alloy also referred to as metallic glass, titanium-zirconium-niobium alloy, titanium-nickel shape memory alloy, titanium and titanium alloy, medical grade stainless steel, medical grade elastic non-metallic materials, and other medical materials. 
         [0100]    The most commonly used material is titanium-nickel shape memory alloy or amorphous alloy also referred to as metallic glass. The two materials both have excellent elasticity and excellent fatigue resistance, and metallic glass has superior fatigue resistance. 
         [0101]    The used amorphous alloy is mainly selected from a group consisting of Ti-based amorphous metal materials, Zr-based amorphous metal materials, Nb-based amorphous metal materials, Fe-based amorphous metal materials and the like. The Ti-based amorphous metal material is a more preferable material for the soft palate support  2 , and its fatigue life is greater than 1×10 8  cycles. 
         [0102]    In addition, the supporting plate  21  is configured with through holes  22 . The through holes  22  can facilitate growth and coverage of tissues, to effectively fix the supporting plate  21  into the muscular layer of the soft palate. See  FIG. 14-1 . 
         [0103]    Generally, the hard palate connecting end  1  may be configured with a fixing rivet  26  for riveting the supporting plates  21 , so as to facilitate clinical mounting and fixing. See  FIG. 9  and  FIG. 9-1 . 
         [0104]    In clinical use, a small incision is made at a junction of the soft palate  7  and the hard palate  6 , and the support  2  is inserted into a muscular layer at a middle portion of the soft palate  7 ; and a medical bone nail  5  is passed through a through hole  111  on the hard palate connecting end  1  to fix the hard palate connecting end  1  to the hard palate  6 . 
         [0105]    During clinical implantation, the support  2  is inserted into the soft palate by a length equal to ⅕ to ⅘, and most preferably, ⅔ to ¾, of a total length of the soft palate. 
         [0106]    Since the layered structure of supporting plates that is formed by stacking thin-walled plates is used as the support  2 , not only the adaptability of the support is improved but also the fatigue fracture resistance of the support is significantly improved while ensuring the supporting force, and the fatigue life is greater than 1×10 8  cycles. Provided that the same material and process are adopted, the smaller the thickness of the supporting plates  21  forming the support  2  is, the longer the fatigue life is. 
         [0107]    Embodiment 2: a Layered Soft Palate Support in an Ascending Configuration of the Present Invention 
         [0108]    Referring to  FIG. 2 , this embodiment is different from the above embodiment in that the stacking manner of the supporting plates  21  forming the support  2  is changed, and the lengths of the supporting plates  21  gradually increases from front to back, that is, P 1 &lt;P 2 &lt;P 3 &lt;P 4 &lt;P 5 , form a configuration in an ascending order of length. Another difference lies in that the supporting plates  21  have the same thickness. 
         [0109]    In addition, the supporting plates  21  forming the support  2  may be stacked in various manners. 
         [0110]      FIG. 3  shows a layered soft palate support in a symmetric configuration. In this embodiment, the length of the P 1  layer is equal to the length of the P 5  layer, the length of the P 2  layer is equal to the length of the P 4  layer, the P 3  layer is the longest, and a symmetric configuration centered about the P 3  layer is formed. 
         [0111]      FIG. 4  shows a layered soft palate support in a sandwiched descending configuration. In this embodiment, the length of the P 1  layer is equal to the length of the P 5  layer, the intermediate three layers have lengths satisfying P 2 &gt;P 3 &gt;P 4 , and a descending configuration is formed. 
         [0112]      FIG. 5  shows a layered soft palate support in a sandwiched symmetric configuration. In this embodiment, the length of the P 1  layer is equal to the length of the P 5  layer, the intermediate three layers, the length of the P 2  layer is equal to the length of the P 4  layer, and a symmetric configuration centered about the P 3  layer is formed. 
         [0113]      FIG. 6  shows a layered soft palate support in a sandwiched ascending configuration. In this embodiment, the length of the P 1  layer is equal to the length of the P 5  layer, the intermediate three layers have lengths satisfying P 2 &lt;P 3 &lt;P 4 , and an ascending configuration is formed. 
         [0114]    Among the numerous configurations, the soft palate supports of the descending configuration and the sandwiched symmetric configuration are preferred. 
         [0115]    In addition, in these embodiments, five equal-length layers are adopted, which is for ease of description. For actual product manufacturing, the layered structure forming the support  2  may also be one equal-length layer, two equal-length layers, three equal-length layers, four equal-length layers, or the like. Each of the equal-length layers may be formed by stacking one or more thin-walled supporting plates  21 . 
         [0116]      FIG. 7  shows a layered soft palate support with one equal-length layer of the present invention. In this embodiment, five thin-walled supporting plates  21  of the same length are stacked to form the support  2 , where each of the thin-walled supporting plates  21  has a thickness of about 0.12 mm. 
         [0117]      FIG. 8  shows a layered soft palate support with two equal-length layers of the present invention. In this embodiment, the P 1  layer is formed by three thin-walled supporting plates  21  of the same length, the P 2  layer is formed by four thin-walled supporting plates  21  of the same length, and the P 1  layer and the P 2  layer are stacked to form the support  2 , where each of the thin-walled supporting plates  21  has a thickness of about 0.08 mm. 
         [0118]    Embodiment 3: a U-Shaped Layered Soft Palate Support in a Sandwiched Descending Configuration of the Present Invention 
         [0119]    Referring to  FIG. 9  and  FIG. 9-1 , in this embodiment, the frontmost supporting plate  21  of the P 1  layer and the rearmost supporting plate  21  of the P 5  layer are formed by bending a single thin-walled metal plate into a U-shape, the supporting plates  21  of the intermediate P 2 , P 3  and P 4  layers are sequentially arranged in a descending order of length. The advantage of such a design lies in that swinging of the supporting plate  21  is limited between the frontmost P 1  layer and the rearmost P 5  layer, so that the supporting force of the support  2  can be increased without compromising the adaptability. 
         [0120]    Embodiment 4: a Layered Soft Palate Support with a Blunt Edge Being a Coil Spring of the Present Invention 
         [0121]    Referring to  FIG. 10 , in this embodiment, the support  2  includes a blunt edge  23 . The blunt edge  23  is a single wire-wound coil spring. The coil spring passes through the through holes  22  at an edge of the supporting plate  21 , to connect the supporting plates  21  of the layers, which on one hand prevents excessive separation of the supporting plates  21  of the layers during swinging of the support  2 , and on the other hand provides a function of blunting the edge of the support  2 , thereby facilitating fixation and growth of tissues. 
         [0122]    The blunt edge  23  being the coil spring is movably wound in the through holes  22  at the edge of the supporting plate  21 , so that a gap between the supporting plates  21  of the layers is maintained in a reasonable range, where the gap is generally smaller than 0.6 mm. 
         [0123]    The coil spring may be wound in different manners.  FIG. 11  shows a segmented winding manner, where multiple segments of metal wires are used to connect the supporting plates  21  of the layers at different positions. 
         [0124]    When the blunt edge  23  adopts the coil spring structure, the blunt edge  23  of the coil spring structure may be made of a medical grade metal wire selected from a group consisting of medical grade stainless steel wires, medical titanium metal wires, medical grade titanium-nickel shape memory alloy, medical grade amorphous alloy wires and wires of other metal materials, or may be made of various high-strength medical polymer material threads or films. 
         [0125]    Embodiment 5: a Layered Soft Palate Support with a Blunt Edge Being Flanges of a Concave-Convex Position-Limiting Engagement Structure 
         [0126]    Referring to  FIG. 12  to  FIG. 12-6 , in this embodiment, the blunt edge  23  on the support  2  is tiny flanges  232  of a concave-convex position-limiting engagement structure. The tiny flanges  232  of a concave-convex position-limiting engagement structure are discontinuously distributed, and fixed to the edge of the support  2  to connect the supporting plates  21  of the layers. 
         [0127]    Embodiment 6: a Layered Soft Palate Support Including a Position-Limiting Mechanism of the Present Invention 
         [0128]    Referring to  FIG. 13  to  FIG. 13-2 , in this embodiment, the support  2  includes a position-limiting mechanism  24 . The provision of the position-limiting mechanism  24  is to prevent excessive separation of the supporting plates  21  of the layers during swinging of the support  2 , that is, to control the gap between the supporting plates  21  of the layers. The simplest and most effective method is adopting a rivet-type limiting structure, that is, fixing the supporting plates  21  of the layers by using a rivet. See  FIG. 13-1 . The objective of controlling the gap between the supporting plates  21  of the layers may also be achieved through a concave-convex position-limiting engagement structure. A protruding lock screw  242  is embedded in a recessed lock nut  241  to form a concave-convex engagement limiting mechanism  24 , which can control the gap between the supporting plates  21  of the layers. See  FIG. 13-2 . 
         [0129]    Embodiment 7: a Layered Soft Palate Support Including a U-Shaped Slot Type Limiting Structure of the Present Invention 
         [0130]    Referring to  FIG. 14  to  FIG. 14-4 , in this embodiment, the support  2  is configured with a position-limiting mechanism  24 . The limiting mechanism  24  is formed by a limiting groove  244  and a limiting plate  243 . The limiting plate  243  is part of an edge of one of the supporting plates  21 , and is bent to form a rectangular or U-shaped slot opening serving as the limiting groove  244 . 
         [0131]    Embodiment 8: a Removable Layered Soft Palate Support Including an Adjustment Washer of the Present Invention 
         [0132]    Referring to  FIG. 15  to  FIG. 15-1 , this embodiment shows a removable layered soft palate support including an adjustment washer of the present invention. The hard palate connecting end  1  is removably assembled to the support  2 . By removing the bone nail  5 , the support  2  can be detached from the hard palate connecting end  1 ; and by tightening the bone nail  5 , the support  2  can be fixed to the hard palate connecting end  1 , and then fixed to the hard palate  6  together with the hard palate connecting end  1 . 
         [0133]    In this embodiment, an adjustment washer  252  is further configured. By appropriately loosening the bone nail  5  at the distal end, the height of the adjustment washer  252  is increased, the lifting angle β of the support  2  is increased, and the lifting degree of the soft palate  7  is increased; by appropriately tightening the bone nail  5  at the distal end, the height of the adjustment washer  252  is reduced, the lifting angle β of the support  2  is reduced, and the lifting degree of the soft palate  7  is reduced. In this way, the lifting degree of the soft palate  7  by the support  2  can be adjusted within a certain range, thereby facilitating clinical mounting. 
         [0134]    Embodiment 9: a Removable Layered Soft Palate Support Including a Wedge-Shaped Adjustment Mechanism of the Present Invention 
         [0135]    Referring to  FIG. 16  to  FIG. 16-1 , this embodiment shows a removable layered soft palate support including a wedge-shaped adjustment mechanism of the present invention. The hard palate connecting end  1  is removably assembled to the support  2 . By removing the bone nail  5 , the support  2  can be detached from the hard palate connecting end  1 ; and by tightening the bone nail  5 , the support  2  can be fixed to the hard palate connecting end  1 , and then fixed to the hard palate  6  together with the hard palate connecting end  1 . 
         [0136]    In this embodiment, a wedge-shaped adjustment mechanism  251  is further configured. By appropriately loosening the bone nail  5  at the distal end, the wedge-shaped adjustment mechanism  251  is pushed toward the near end, the lifting angle β of the support  2  is increased, and the lifting degree of the soft palate  7  is increased; by appropriately tightening the bone nail  5  at the distal end, the wedge-shaped adjustment mechanism  251  is pushed toward the distal end, the lifting angle β of the support  2  is reduced, and the lifting degree of the soft palate  7  is reduced. In this way, the lifting degree of the soft palate  7  by the support  2  can be adjusted within a certain range, thereby facilitating clinical mounting. 
         [0137]    In addition, the adjustment mechanism  25  may be designed in various ways, and is merely described by way of example herein. 
         [0138]    Embodiment 10: a Removable Layered Soft Palate Support Including a Wedge-Shaped Adjustment Mechanism of the Present Invention 
         [0139]    Referring to  FIG. 17  to  FIG. 17-3 , this embodiment shows a soft palate support of the present invention capable of being implanted in stages. The hard palate connecting end  1  may be fixed to the hard palate  6  through a bone nail  5 , and the support  2  is removably assembled to the hard palate connecting end  1  through a screw  8 . 
         [0140]    In a clinical surgery, the support may be implanted in two stages. 
         [0141]    First stage surgery: Under local anesthesia or general anesthesia, first a small incision is made at a proper portion of the hard palate  6 , and then the hard palate connecting end  1  of the layered soft palate support is implanted, the bone nail  5  is passed through the through hole  111  on the hard palate connecting end  1  to fix the hard palate connecting end  1  to the hard palate  6 , and the incision is sutured. See  FIG. 17-2 . 
         [0142]    Second stage surgery: One month to three months later after the first stage surgery is finished, the hard palate connecting end  1  has been firmly fixed to the hard palate  6 . At this time, a second stage surgery is performed. Under local anesthesia or general anesthesia, a small incision is made at the junction of the soft palate  7  and the hard palate  6 , and then one end of the support  2  is inserted into the muscular layer at the middle portion of the soft palate  7 , where the support  2  is inserted into the soft palate by a length equal to ⅕ to ⅘ of the total length of the soft palate; and then, the other end of the support  2  is fixed to the hard palate connecting end  1  by using the screw  8 , and the incision is sutured. See  FIG. 17-3 . 
         [0143]    It should be noted that, the structures disclosed and described in the present invention may be replaced by other structure with the same effect, and the embodiments described in the present invention are not intended to limit the present invention. Though the preferred embodiments of the present invention have been introduced and described in the specification, persons skilled in the art should know that these embodiments are merely described by way of example, and persons skilled in the art may make various changes, improvements, and replacements without departing from the present invention. Therefore, the protection scope of the present invention should be defined in accordance with the spirit and scope of the appended claims of the present invention.