Periosteal distraction system

Abstract

The present invention provides a periosteal distraction system, including a periosteal distraction plate, a mother nail, and a child nail. The periosteal distraction plate includes a first distraction plate and a second distraction plate, and the first distraction plate and the second distraction plate are detachably connected; the periosteal distraction plate has a first connection portion, and the mother nail has a second connection portion, and the first connection portion is connected and fixed with the second connection portion; the mother nail is a hollow structure and has an internal thread, and the mother nail has a second threaded portion and a second bare rod portion; the child nail is installed in the mother nail, and the child nail has a first threaded portion and a first bare rod portion, and the first threaded portion cooperates with the internal thread of the mother nail; the child nail is rotated so that the mother nail and the periosteal distraction plate move along the axial direction of the child nail, and the end of the child nail protrudes from the periosteal distraction plate. Using the technical solution provided by the present invention, the periosteal incision is smaller, the trauma caused to the periosteum is smaller, and the occurrence of skin irritation is reduced when the periostium is distracted.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a periosteal stretching system. Background Art

[0002] In recent years, with the introduction and development of Ilizarov technology, the transverse tibial bone transfer technology based on the Ilizarov principle has been widely used in the treatment of lower limb ischemic diseases, and has performed well in reconstructing lower limb blood circulation and promoting wound healing. Tibial periosteum distraction has the characteristics of simple operation, low cost, and strong patient comfort, so it is gradually being widely used in clinical practice. The bone distraction plate made by the transverse bone transfer technology is widely used in clinical treatment due to its unique structural design, good biocompatibility, precise distraction regulation performance, and excellent effect in promoting bone healing and regeneration.

[0003] However, the traditional periosteal distraction board is long, and the periosteal incision is large during installation, which is only suitable for the situation where the periosteal structure environment is not complicated. In addition, the two sides of the traditional distraction board are conical structures, which can easily cause skin irritation during the traction process. Summary of the invention

[0004] The purpose of the present invention is to provide a periosteal distraction system, which has a smaller periosteal incision during installation, is suitable for a variety of periosteal environments, reduces the probability of skin irritation, and improves patient comfort.

[0005] In order to achieve the above-mentioned invention objectives, the present invention provides a periosteal distraction system, including a periosteal distraction plate, a mother nail, and a child nail, characterized in that the periosteal distraction plate includes a first distraction plate and a second distraction plate, and the first distraction plate and the second distraction plate are detachably connected; the periosteal distraction plate has a first connecting portion, and the mother nail has a second connecting portion, and the first connecting portion is connected and fixed to the second connecting portion; the mother nail is a hollow structure and has an internal thread; the mother nail has a second threaded portion and a second bare rod portion; the child nail is installed in the mother nail, and the child nail has a first threaded portion and a first bare rod portion, and the first threaded portion cooperates with the internal thread of the mother nail; rotating the child nail makes the mother nail and the periosteal distraction plate move along the axial direction of the child nail, and the end of the child nail protrudes out of the periosteal distraction plate.

[0006] The present invention also has the following characteristics: the first end of the second tensioning plate has a circular connecting portion, the first end of the first tensioning plate has a groove and a baffle covering the groove, and the circular connecting portion is inserted into the groove and fixed.

[0007] The present invention also has the following characteristics: the first connecting part includes a first threaded hole on the circular connecting part and a through hole on the baffle; the second connecting part includes a second threaded part of the female nail; the second threaded part of the female nail passes through the through hole of the baffle and is fixed to the first threaded hole.

[0008] The present invention also has the following feature: the overlapping length between the circular connecting portion and the groove is between 8 and 12 mm.

[0009] The present invention also has the following characteristics: the second end of the second stretching plate and the second end of the first stretching plate are both designed with rounded corners and have an outwardly thinned chamfered surface.

[0010] The present invention also has the following characteristics, and also includes a massage system, which includes a massage belt and a controller; the massage belt includes a base, a memory alloy strap and a fixed ring, and the memory alloy strap and the fixed ring are embedded in the base; the massage belt is used to wrap the part that needs to be massaged, and the fixed ring is sleeved outside the mother nail; the controller is connected to the memory alloy strap, and is used to generate a periodic current signal. When the current signal is transmitted to the memory alloy strap, the temperature of the memory alloy rises and deformation and contraction occur; when there is no current signal, the temperature of the memory alloy drops and deformation and expansion occur.

[0011] The present invention also has the following characteristics: the substrate is made of PDMS material, the memory alloy band is made of nickel-titanium memory alloy, and the fixing ring is made of stainless steel.

[0012] The present invention also has the following characteristics: the massage belt has conical air holes arranged in an array, and there are sweat drainage channels between the conical air holes, and the conical air holes are interconnected through the sweat drainage channels.

[0013] The present invention also has the following features, including a handle, wherein the handle drives the sub-nail to rotate, and the handle is provided with a scale.

[0014] The present invention also has the following feature: the outer surfaces of the mother nail and the daughter nail are both coated with hydroxyapatite.

[0015] By using the technical solution provided by the present invention, the first distraction plate and the second distraction plate are designed to be detachably connected, so that the periosteal incision is smaller and the trauma to the periosteum is less. The design method of matching the mother screw and the child screw can prevent the thread of the screw from cutting the skin when it rotates, thereby reducing irritation to the skin. The periosteal distraction plate is designed using ergonomic principles, and a structure with arc-shaped transition to rounded corners is adopted at both ends, which can reduce the notch and reduce the occurrence of skin irritation during the lifting operation. The matching massage belt can reduce the possibility of displacement or deformation of the fixing screw due to external force. Moreover, its special structural design makes it breathable, lightweight and waterproof, suitable for long-term wear, and you can even take a shower while wearing it. The matching use of the distraction plate and the massage belt can significantly enhance the blood circulation effect and accelerate the recovery speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the periosteal stretching system of the present invention.

[0017] Figure 2 It is a schematic structural diagram of a second tensioning plate according to an embodiment of the present invention.

[0018] Figure 3 It is a schematic structural diagram of a first tensioning plate according to an embodiment of the present invention.

[0019] Figure 4 It is a schematic structural diagram of a periosteal distraction plate according to an embodiment of the present invention.

[0020] Figure 5 It is a schematic structural diagram of a female nail according to an embodiment of the present invention.

[0021] Figure 6 It is a schematic structural diagram of a sub-nail according to an embodiment of the present invention.

[0022] Figure 7 Schematic diagram of the structure of a massage system according to an embodiment of the present invention.

[0023] Figure 8 It is a schematic structural diagram of a periosteal stretching system in a first state according to an embodiment of the present invention.

[0024] Fig. 9 It is a structural schematic diagram of the second state of the periosteal stretching system of an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Embodiment 1

[0029] refer to Figure 1-6 A periosteal distraction system includes a periosteal distraction plate 1, a mother nail 2, and a child nail 3. The periosteal distraction plate 1 includes a first distraction plate 11 and a second distraction plate 12. The first distraction plate 11 and the second distraction plate 12 are detachably connected. In this way, during clinical installation, the second distraction plate 12 and the first distraction plate 11 can be installed separately, the periosteal incision is smaller, and the trauma to the periosteum is less.

[0030] The periosteal distraction plate 1 has a first connection portion, the mother screw 2 has a second connection portion, the first connection portion is connected and fixed with the second connection portion; the mother screw 2 is a hollow structure and has an internal thread 21, the mother screw 2 has a second threaded portion 22 and a second bare rod portion 23; the sub-screw 3 is installed in the mother screw 2, the sub-screw 3 has a first threaded portion 31 and a first bare rod portion 32, the first threaded portion 31 cooperates with the internal thread 21 of the mother screw 2; the sub-screw 3 is rotated so that the mother screw 2 and the periosteal distraction plate 1 move along the axial direction of the sub-screw 3, and the end of the sub-screw 3 protrudes from the periosteal distraction plate 1. The external thread area of ​​the traditional periosteal distraction plate screw directly contacts the skin tissue, and its thread length is the same as the length of the screw body. In actual application, the overly long thread will not only cut the skin, but also cause local skin compression, friction damage and scar formation, and the installation process becomes complicated. In this technical solution, the non-threaded area on the outside of the mother nail is designed to be a smooth surface to avoid the thread from cutting the skin tissue; the sub-nail has threads only in the head area, which ensures that the threads are always located inside the mother nail during the adjustment process, and the other areas of the sub-nail are also designed to be smooth surfaces to reduce damage to the tissue. In one embodiment, the sub-nail is rotated, and the end of the sub-nail protrudes from the periosteal distraction plate to support the bone, and the sub-nail continues to rotate. The end of the sub-nail is subjected to force, driving the mother nail and the periosteal distraction plate fixedly connected to the mother nail to move away from the human bone, thereby achieving distraction of the periosteum. In this process, the part of the mother nail in contact with the skin tissue remains relatively still with the skin and tissue in contact, reducing skin irritation and improving comfort. Specifically, the first end of the second distraction plate 12 has a circular connecting portion 121, and the first end of the first distraction plate 11 has a groove 111 and a baffle 112 covering the groove 111, and the circular connecting portion 121 is inserted into the groove 111 and fixed. The circular connecting portion can reduce stimulation to the skin and tissue, and reduce the probability of skin irritation caused by sharp structures.

[0031] Specifically, the circular connecting portion 121 has a first threaded hole 122, the baffle 112 has a through hole 113, the first connecting portion includes the first threaded hole 122 and the through hole 113, the first end of the female screw 2 has a second threaded portion 22, and the second connecting portion includes the second threaded portion 22. The second threaded portion 22 of the female screw 2 passes through the through hole 113 of the baffle 112 and is fixed to the first threaded hole 122. The length of the second threaded portion of the female screw is adapted to the depth of the threaded hole reserved for the second distraction plate, ensuring that the female screw can be firmly combined with the periosteal distraction plate without any excess thread exposed. During the fixation of the female screw and the periosteal distraction plate, due to the limited length of the thread, the female screw cannot continue to twist after reaching the predetermined position, and the doctor can quickly confirm that the female screw has been installed in place.

[0032] Specifically, the overlapping length of the circular connecting portion 121 and the baffle 112 is between 8-12 mm. If it is too short, the stability of the periosteal distraction plate will be reduced during lifting, and if it is too long, the installation difficulty will be increased. The overlapping length between 8-12 mm can ensure the stability of the periosteal distraction plate.

[0033] Specifically, the second end of the second distraction plate 12 and the second end of the first distraction plate 11 are both rounded and have an outwardly thinning beveled surface 4. Based on a large amount of clinical experience, the conical structure on both sides of the traditional distraction plate is changed to an arc structure, and the rounded corners are designed to reduce the probability of skin irritation caused by the sharp structure during the traction process, and reduce the discomfort during the periosteum stretching. The principle of periosteal stretching is to pull the distraction plate, thereby driving the stretching of the periosteum. Compared with the sharp angle design, the arc design will reduce the stabbing feeling of the distraction plate on the skin, thereby reducing the occurrence of rejection reaction. At the same time, the design of the beveled surface makes the first distraction plate and the second distraction plate thinner at the second end in the direction from the first end to the second end, which can further reduce the probability of skin irritation and reduce the discomfort during the periosteum stretching.

[0034] Specifically, it also includes a handle 5, which drives the sub-nail 3 to rotate. The head of the sub-nail has a straight groove, a cross groove, a Pozidriv groove or other patterns. The end of the handle is similar to a screwdriver and is adapted to the head of the sub-nail to drive the sub-nail to rotate. The handle 5 is provided with a scale, and the scale of the handle can intuitively display the degree of tension.

[0035] Specifically, the outer surfaces of the mother nail 2 and the sub-nail 3 are both coated with hydroxyapatite. In one embodiment, the outer surfaces of the second bare rod portion 23 of the mother nail 2 and the first bare rod portion 32 of the sub-nail 3 are both coated with hydroxyapatite. This coating has a similar chemical composition and structure to human bones, thereby reducing the probability of rejection. The periosteal distraction plate is made of titanium alloy. At the same time, the distraction plate is designed using ergonomic principles to further reduce skin irritation.

[0036] Embodiment 2

[0037] During the process of periosteum stretching, local tissues will be stretched and compressed, causing pain and swelling. Especially in the initial stage or when the stretching force is large, this pain and swelling may gradually increase during the stretching process, and long-term swelling will affect the normal function of the tissue. Therefore, some massage devices can relieve discomfort to a certain extent, but current massage devices are generally large in size and inconvenient to wear for a long time.

[0038] After installing the periosteal distraction plate, the patient needs to adjust the degree of traction regularly, which means that some screws must be exposed outside the body. Therefore, for a considerable period of time, the patient must pay special attention to protective measures to ensure that the wound is not exposed to water. Although there are some waterproof measures on the market, such as waterproof band-aids, they usually cannot take into account both waterproofness and breathability, so they cannot be worn for a long time.

[0039] refer to Figure 7 The periosteal stretching system of the present invention also includes a massage system, which includes a massage belt 6 and a controller 7; the massage belt 6 includes a base, a memory alloy band 8 and a fixing ring 9, and the memory alloy band 8 and the fixing ring 9 are embedded in the base; the massage belt 6 is used to wrap the part that needs to be massaged, and the fixing ring 9 is sleeved outside the mother nail 2. When the periosteal stretching system is in use, the mother nail may have a very small part exposed outside the body. For the part that may be exposed, a fixing ring is designed in the massage system to fix and cover part of the mother nail. The massage system has the advantages of small size, waterproof, light and breathable. After the periosteal stretching plate is installed, due to the need to adjust the stretching regularly, a part of the wound tissue is exposed to the air for a long time, which makes its care a big problem and cannot be exposed to water to prevent infection. The present invention is equipped with a massage system, and the base is manufactured by microfluidic technology. The base is breathable and waterproof, which enhances its antibacterial ability. The patient can even take a normal bath after using it.

[0040] The controller 7 is connected to the memory alloy band 8 and is used to generate a periodic current signal. When the current signal is transmitted to the memory alloy band 8, the temperature of the memory alloy rises and the deformation and contraction occur; when there is no current signal, the temperature of the memory alloy drops and the deformation and expansion occur. Designing a matching massage belt can help further reduce the probability of displacement or deformation of the fixing screws due to external forces, reduce the risk of infection caused by external factors, and improve the comfort of wearing and the recovery effect. The massage system uses the superelastic properties of the memory alloy to make a massage driver. The memory alloy can automatically change its shape when the temperature changes. Moreover, compared with the pneumatic drive method, the memory alloy drive is smaller in size and has a stronger driving force.

[0041] Specifically, the substrate is made of PDMS material, the memory alloy band 8 is made of nickel-titanium memory alloy, and the fixing ring 9 is made of stainless steel. PDMS is a hydrophobic structure with porous flexibility. Wound granulation is not easy to grow on PDMS, and it has good antibacterial and biocompatibility. After being worn for a long time and removed, it will not cause secondary tearing of the wound.

[0042] Specifically, the massage belt 6 has tapered air holes arranged in an array, and there are sweat drainage channels between the tapered air holes, and the tapered air holes are interconnected through the sweat drainage channels. The cross-sectional area of ​​the tapered air holes decreases from the end in contact with the skin upward, and this design can improve the efficiency of sweat drainage.

[0043] The production process of the massage belt is as follows: first, place the memory alloy band in a specific circular container, then place a fixing ring at a suitable position, and then introduce the PDMS material into the circular container. After the PDMS material solidifies, take out the massage belt. Finally, use laser cutting technology to make conical air holes on the massage belt.

[0044] The periosteal stretching system and the massage system can be used together to enhance the effect. The massage system can reduce muscle discomfort during stretching, and work together with the periosteal stretching plate on the legs to stimulate the periosteal stretching while massaging the muscles, promoting vasoconstriction, and strengthening blood circulation, thereby enhancing the recovery effect. It should be noted that the two systems can be used together to improve wearing comfort and recovery speed, but it is not mandatory to use both systems at the same time. Users and doctors can judge how to use them based on clinical conditions.

[0045] Embodiment 3

[0046] refer to Figure 8-9 , Figure 8 This is a schematic diagram of the structure of the first state of the periosteal distraction system. Fig. 9 This is a schematic diagram of the structure of the second state of the periosteal stretch system.

[0047] A method for using a periosteal distraction system, comprising:

[0048] S1: Install the second distraction plate 12 on the bone through the periosteal incision and install Kirschner wires for auxiliary fixation;

[0049] S2: installing the first distraction plate 11 on the bone through the periosteal incision, connecting the first distraction plate 11 with the second distraction plate 12 and installing Kirschner wires for auxiliary fixation;

[0050] Kirschner wires can be installed around the first and second distraction plates to assist in fixing the first and second distraction plates. In one embodiment, the first and second distraction plates have positioning holes, and the Kirschner wires are inserted into the positioning holes to fix the first and second distraction plates.

[0051] S3: Installing the second connection portion of the female nail 2 to the first connection portion of the periosteal distraction plate 11;

[0052] The first end of the second distraction plate 12 has a circular connection portion 121, and the first end of the first distraction plate 11 has a groove 111 and a baffle 112 covering the groove 111. The circular connection portion 121 is inserted into the groove 111 and fixed. The first connection portion includes a first threaded hole 122 on the circular connection portion 121 and a through hole 113 on the baffle 112. The second connection portion includes a second threaded portion 22 of the female screw 2, and the second threaded portion 22 of the female screw 2 passes through the through hole 113 of the baffle 112 and is fixed to the first threaded hole 122. The length of the second threaded portion of the female screw is adapted to the depth of the threaded hole reserved in the second distraction plate, ensuring that the female screw can be firmly combined with the periosteal distraction plate without any excess thread exposed. During the fixation of the female screw and the periosteal distraction plate, due to the limited length of the thread, the female screw cannot continue to twist after reaching the predetermined position, and the doctor can quickly confirm that the female screw has been installed in place.

[0053] S4: Install the sub-nail 3 in the mother nail 2; at this time, the state of the periosteal distraction plate is as follows: Figure 8 shown.

[0054] The mother nail 2 is a hollow structure with an internal thread 21; the sub-nail 3 is installed in the mother nail 2, and the sub-nail 3 has an external thread, which cooperates with the internal thread 21 of the mother nail 2. The sub-nail 3 has a first threaded portion 31 and a first smooth rod portion 32, and the mother nail 2 has a second threaded portion 22 and a second smooth rod portion 23. The non-threaded area on the outside of the mother nail is designed to be a smooth surface to avoid the thread cutting the skin tissue; the sub-nail has threads only in the head area, which ensures that the threads are always located inside the mother nail during the adjustment process, and other areas of the sub-nail are also designed to be smooth surfaces to reduce damage to the tissue. The outer surfaces of the mother nail 2 and the sub-nail 3 are both coated with hydroxyapatite.

[0055] S5: Rotate the sub-nail 3 so that the end of the sub-nail 3 protrudes from the periosteal distraction plate 1, and the mother nail 2 and the periosteal distraction plate 1 move along the axial direction of the sub-nail to adjust the degree of distraction of the periosteum.

[0056] Rotate the sub-screw, the end of the sub-screw protrudes out of the periosteal distraction plate and presses against the bone. Continue to rotate the sub-screw, the end of the sub-screw is stressed, driving the mother screw and the periosteal distraction plate fixed to the mother screw to move away from the human bone, thus achieving the distraction of the periosteum. Fig. 9 shown.

[0057] The periosteal distraction system and the method of using the same proposed by the present invention make the periosteal incision smaller and the trauma to the periosteum smaller by designing the first distraction plate and the second distraction plate to be detachably connected. The design method of matching the mother screw and the child screw can prevent the screw thread from cutting the skin when the screw rotates, thereby reducing irritation to the skin. The periosteal distraction plate is designed using ergonomic principles, and a structure with arc-shaped transitions to rounded corners is adopted at both ends, which can reduce the notch and reduce the occurrence of skin irritation during the lifting operation. The matching massage belt can reduce the possibility of displacement or deformation of the fixing screw due to external force. Moreover, its special structural design makes it breathable, lightweight and waterproof, suitable for long-term wear, and even bathing during wearing. The matching use of the distraction plate and the massage belt can significantly enhance the blood circulation effect and accelerate the recovery speed.

[0058] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A periosteal distraction system, comprising a periosteal distraction plate (1), a mother nail (2), and a daughter nail (3), characterized in that: The periosteal distraction plate (1) comprises a first distraction plate (11) and a second distraction plate (12), wherein the first distraction plate (11) and the second distraction plate (12) are detachably connected; the periosteal distraction plate (1) has a first connection portion, the mother nail (2) has a second connection portion, and the first connection portion is connected and fixed to the second connection portion; the mother nail (2) is a hollow structure and has an internal thread (21); the sub-nail (3) is installed in the mother nail (2), and the sub-nail (3) has a first threaded portion (31), and the first threaded portion (31) cooperates with the internal thread (21) of the mother nail (2); the sub-nail (3) is rotated so that the mother nail (2) and the periosteal distraction plate (1) move along the axial direction of the sub-nail (3), and the end of the sub-nail (3) protrudes from the periosteal distraction plate (1); Also included is a massage system, the massage system comprising a massage belt (6) and a controller (7); the massage belt (6) comprises a base, a memory alloy binding belt (8) and a fixing ring (9), the memory alloy binding belt (8) and the fixing ring (9) being embedded in the base; The massage belt (6) is used to wrap around a part that needs to be massaged, and the fixing ring (9) is sleeved outside the female nail (2); the controller (7) is connected to the memory alloy bandage (8) and is used to generate a periodic current signal. When the current signal is transmitted to the memory alloy bandage (8), the temperature of the memory alloy rises and deformation and contraction occur; when there is no current signal, the temperature of the memory alloy drops and deformation and expansion occur.

2. The periosteal distraction system according to claim 1, characterized in that: The first end of the second tensioning plate (12) has a circular connecting portion (121), the first end of the first tensioning plate (11) has a groove (111) and a baffle (112) covering the groove (111), and the circular connecting portion (121) is inserted into the groove (111) and fixed.

3. The periosteal distraction system according to claim 2, characterized in that: The first connection portion comprises a first threaded hole (122) on the circular connection portion (121) and a through hole (113) on the baffle plate (112); the second connection portion comprises a second threaded portion (22) of the female nail (2); the second threaded portion (22) of the female nail (2) passes through the through hole (113) of the baffle plate (112) and is fixed to the first threaded hole (122).

4. The periosteal distraction system according to claim 2, characterized in that: The overlapping length between the circular connecting portion (121) and the baffle (112) is between 8 mm and 12 mm.

5. The periosteal distraction system according to claim 1, characterized in that: The sub-nail (3) has a first threaded portion (31) and a first smooth rod portion (32), and the mother nail (2) has a second threaded portion (22) and a second smooth rod portion (23).

6. The periosteal distraction system according to claim 2, characterized in that: The second end of the second stretching plate (12) and the second end of the first stretching plate (11) are both rounded in design and both have an outwardly thinning chamfered surface (4).

7. The periosteal distraction system according to claim 1, characterized in that: The substrate is made of PDMS material, the memory alloy band (8) is made of nickel-titanium memory alloy, and the fixing ring (9) is made of stainless steel.

8. The periosteal distraction system according to claim 1, characterized in that: The massage belt (6) has tapered air holes arranged in an array, and there are sweat drainage channels between the tapered air holes, and the tapered air holes are interconnected through the sweat drainage channels.

9. The periosteal distraction system according to claim 1, characterized in that: It also comprises a handle (5), wherein the handle (5) drives the sub-nail (3) to rotate, and the handle (5) is provided with a scale.

10. The periosteal distraction system according to claim 1, characterized in that: The outer surfaces of the mother nail (2) and the daughter nail (3) are both coated with hydroxyapatite.

Images