A bone tissue long-range adjustment device

Abstract

The application discloses a long-distance adjusting device for bone tissue, which comprises a body and an adjusting rod. The body can expand or tighten the bone tissue. The adjusting rod comprises a first adjusting position and a second adjusting position. When the adjusting rod is in the first adjusting position, the adjusting rod can adjust the position of the body relative to the bone tissue and / or adjust the distance between the bone tissues. When the adjusting rod is in the second adjusting position, the adjusting rod can adjust the length of the body and / or adjust the distance between the bone tissues. The long-distance adjusting device for bone tissue is used in orthopedic surgery for resetting embedded or collapsed bone fracture blocks. The body of the application can not only fix two bone blocks, but also adjust the distance between the two bone blocks once through the difference in thread spacing, so that the bone can be better reset. The body can be secondarily adjusted through the adjusting rod, the distance between the bone tissues is further adjusted on the basis of the first adjustment, and only the length of the body is adjusted without adjusting the connection between the body and the bone tissues in the second adjustment, thereby avoiding the secondary damage of the body to the connected bone tissues.

Description

Technical Field

[0001] This invention relates to a long-distance bone tissue adjustment device. Background Technology

[0002] Screws are commonly used for fracture fixation in orthopedic surgery. According to the functional classification of screws, the commonly used screws in clinical practice generally include two types: (1) ordinary screws, which only serve to fix the adjacent bones or fix the plate to the bone; (2) compression screws. In recent years, with the development of technology, compression screws have been widely used in fracture surgery because they not only have the function of fixing the fracture, but also can apply local pressure to the fracture ends. When fixing the plate, they can also apply pressure to the fixation between the plate and the bone. Compared with ordinary screws, their stability after fixation is better. However, in clinical practice, compression screws are not suitable for impacted fractures or fractures with collapse, such as tibial plateau fractures and calcaneal collapse fractures. For such fractures, Kirschner wires or surgical forceps are used to restore the plane. However, because there is no stable holding force after reduction, the fracture reduction is often lost during subsequent plate or screw fixation, and the fracture reduction fails. Therefore, for clinicians, how to effectively reduce impacted or collapsed fracture fragments and ensure that there is a stable holding force after reduction has become a considerable problem.

[0003] To address the aforementioned issues, some scholars have independently designed a product, with the corresponding patent number: 2021207707095, patent name: A screw with a dilatation function. However, the design of this screw, which dilatates fracture fragments through continuously increasing thread pitch, does not meet the requirements of actual surgery. For example, when threads of different pitches are located within the same fracture fragment, the result is that the same fracture fragment is torn apart, rather than dilatating the collapsed fracture fragment. Furthermore, the dilatation distance of this thread is limited. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a long-distance bone tissue adjustment device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a long-distance bone tissue adjustment device, comprising a body and an adjustment rod, wherein the body is capable of expanding or tightening the bone tissue, and the adjustment rod includes a first adjustment position and a second adjustment position. When the adjustment rod is in the first adjustment position, the adjustment rod is capable of adjusting the position of the body relative to the bone tissue and / or adjusting the bone tissue spacing; when the adjustment rod is in the second adjustment position, the adjustment rod is capable of adjusting the length of the body and / or adjusting the bone tissue spacing.

[0006] Furthermore, the main body includes a first support member and a second support member, which are capable of relative movement. When the adjusting rod is in the first adjusting position, the adjusting rod can drive the first support member and the second support member to rotate simultaneously; when the adjusting rod is in the second adjusting position, the adjusting rod can adjust the length of the first support member and the second support member.

[0007] Furthermore, the first support member is provided with a first thread; the second support member is provided with a second thread, and the pitch of the first thread is smaller than the pitch of the second thread.

[0008] Furthermore, the adjusting rod includes a first rotating rod, a second rotating rod, and a third rotating rod. The second rotating rod is sleeved outside the first rotating rod, and the third rotating rod is sleeved outside the second rotating rod. The first rotating rod, the second rotating rod, and the third rotating rod can rotate individually and / or together.

[0009] Furthermore, the second rotating rod is provided with a first fixing hole, and the third rotating rod is provided with a second fixing hole, and the pin can be inserted or pulled out from the first fixing hole and the second fixing hole.

[0010] Furthermore, the end of the first support member away from the first thread is provided with a screw with a first notch, and the first end of the first rotating rod can engage with the first notch.

[0011] Furthermore, the second support member includes a rotating member and a threaded member, which are rotatably connected. The inner wall of the rotating member is provided with a third thread that can connect with the screw.

[0012] Furthermore, the rotating component is provided with a second notch, and the second rotating rod is provided with a first protrusion that can cooperate with the second notch.

[0013] Furthermore, the threaded part is provided with a third notch, and the third rotating rod is provided with a second protrusion that can cooperate with the third notch.

[0014] Furthermore, it also includes an extension screw, which can fill the gaps created by the movement of the rotating part and the screw, and can fix the rotating part and the threaded part after the extension screw is installed.

[0015] In summary, the bone tissue long-distance adjustment device of the present invention is used in orthopedic surgery for repositioning impacted or collapsed bone fragments. The main body of the present invention can not only fix two bone fragments, but also adjust the distance between the two bone fragments through the difference in thread pitch, so that the bone can be better repositioned. The main body can also be adjusted a second time through the adjustment rod, further adjusting the distance between the bone tissues on the basis of the first adjustment. Moreover, the second adjustment only adjusts the length of the main body and does not adjust the connection between the main body and the bone tissue, thereby avoiding secondary damage to the connected bone tissue by the main body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the adjusting device structure of the present invention. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the adjusting device structure of the present invention. Figure 2 .

[0018] Figure 3 This is a schematic diagram of the disassembled structure of the main body of the present invention.

[0019] Figure 4 This is a schematic diagram of the main body structure of the present invention. Figure 1 .

[0020] Figure 5 This is a schematic diagram of the main body structure of the present invention. Figure 2 .

[0021] Figure 6 This is a schematic diagram of the second support member structure of the present invention.

[0022] Figure 7 This is a schematic diagram of the extended screw structure of the present invention.

[0023] Figure 8 This is a schematic diagram of the adjusting rod structure of the present invention. Figure 1 .

[0024] Figure 9 This is a schematic diagram of the adjusting rod structure of the present invention. Figure 2 .

[0025] Figure 10 This is a partial schematic diagram of the adjusting rod structure of the present invention.

[0026] Figure 11 This is a schematic diagram of the disassembled adjusting rod structure of the present invention. Figure 1 .

[0027] Figure 12 This is a schematic diagram of the disassembled structure of the adjusting rod of the present invention. Figure 2 .

[0028] Figure 13 This is a schematic diagram of the first adjusting rod structure of the present invention.

[0029] Figure 14 This is a schematic diagram of the second adjusting rod structure of the present invention.

[0030] Figure 15 This is a schematic diagram of the third adjusting rod structure of the present invention. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] like Figure 1 As shown in Figure 15, a long-distance bone tissue adjustment device includes a body 1 and an adjustment rod 2. The body 1 can expand or tighten the bone tissue. The adjustment rod 2 includes a first adjustment position and a second adjustment position. When the adjustment rod 2 is in the first adjustment position, it can adjust the position of the body 1 relative to the bone tissue and / or adjust the distance between the bone tissues. When the adjustment rod 2 is in the second adjustment position, it can adjust the length of the body 1 and / or adjust the distance between the bone tissues. Typically, the first adjustment position can adjust the distance between two bone tissues to 0-4 mm; the second adjustment position can adjust the distance between two bone tissues to 0-5 mm.

[0033] like Figure 1 The initial state of the main body 1 and adjusting rod 2 is such that the protrusion at the front end of the adjusting rod 2 is fully engaged in the groove of the main body 1. The adjusting rod 2 includes a first rotating rod 21, a second rotating rod 22, and a third rotating rod 23. The second rotating rod 22 is sleeved outside the first rotating rod 21, and the third rotating rod 23 is sleeved outside the second rotating rod 22. The first rotating rod 21, the second rotating rod 22, and the third rotating rod 23 can rotate individually and / or together. When the adjusting rod 2 is in the first adjusting position, the second rotating rod 22 and the third rotating rod 23 can rotate together; when the adjusting rod 2 is in the second adjusting position, the second rotating rod 22 and the third rotating rod 23 are in a non-connected state, the first rotating rod 21 is fixed, and the second rotating rod 22 rotates independently, thereby driving the rotating component 122 to rotate independently.

[0034] The body 1 of this invention is actually a dispersing screw, suitable for orthopedic surgery to reduce impacted or collapsed fracture fragments. In such orthopedic surgeries, the dispersing screw is connected between two bone fragments, and the relative distance between the two bone fragments is corrected by the traction of the dispersing screw. Using the body 1 of this invention, i.e., the dispersing screw, the screw is first drilled between the two bone fragments to be reduced. By rotating the adjusting rod 2, the body 1 is placed at both ends of the collapsed fracture site, achieving the purpose of short-distance dispersing or shortening in the first stage, which can be considered as the step to be completed in the first surgery. Since bone tissue regeneration requires a certain recovery period, and the recovery of bone tissue needs to be monitored regularly during the recovery period, if the recovery is not good, a second surgery can be performed to extend the body 1 of this invention. Through the cooperation of the body 1 and the second adjustment position of the adjusting rod 2, the body 1 is dispersed in the second stage, thereby further expanding the distance between the two bone fragments. Finally, through the cooperation of the extension screw 3 and the adjusting rod 2, the anti-rotation fixation and gap filling inside the body 1 are achieved, thereby ensuring the accuracy of reduction and providing a continuous and stable holding force for fracture reduction.

[0035] This invention features two adjustment positions: a first adjustment position and a second adjustment position. When the adjustment rod 2 is in the first adjustment position, it can adjust the position of the body 1 relative to the bone tissue. This is achieved primarily by rotating the body 1 as a whole, relying on the difference in the threads of the body 1 to adjust the distance between the bone tissues. The body 1 has a first external thread 111 and a second external thread 121 on its exterior. The pitches of the first external thread 111 and the second external thread 121 differ. When the second rotating rod 22 and the third rotating rod 23 are connected, rotating the body 1 via the adjustment rod 2 causes the second rotating rod 22 and the third rotating rod 23 to rotate simultaneously. This, in turn, causes the first support member 11 and the second support member 12 of the body 1 to rotate simultaneously, i.e., the first external thread 111 and the second external thread 121 rotate simultaneously. The axially symmetrical traction force generated by the difference in the two pitches of the body 1, under the action of the traction force, achieves the purpose of correcting the distance between the two bone fragments. This can be considered as the first adjustment of the two bone fragments, which is the step that needs to be completed in the first surgery.

[0036] If a patient's postoperative recovery is unsatisfactory, the surgeon can perform a second operation to extend the main body 1. This second adjustment of the two bone fragments is achieved by adjusting the length of the main body 1 without rotating its first external thread 111 and second external thread 121. Specifically, the first rotating rod 21 is held and fixed, while the second rotating rod 22 is rotated independently. The second rotating rod 22 then moves the rotating component 122 along the screw 116, thus extending the main body 1. Generally, extending the length of the main body 1 is intended to allow for greater separation of the two collapsed bone fragments. The main body 1 of this invention not only fixes the two bone fragments but also adjusts the distance between them through the difference in thread spacing created by rotating the main body, allowing for better reduction of the fracture. Furthermore, the adjusting rod 2 can be used for a second adjustment of the main body 1, specifically adjusting the distance between the bone tissues. This second adjustment only modifies the length of the main body 1 without altering the connection between the main body and the bone tissue, thus preventing secondary damage to the connecting bone tissue. Whether the patient needs secondary adjustment depends on the postoperative recovery. If the postoperative recovery is good, the patient does not need to adjust the fracture site. However, if the recovery is poor, the screw (body 1) of this invention can play a secondary adjustment role. The doctor only needs to make secondary adjustments to the body 1 of this invention to extend the screw (body 1) without rotating the connection between the screw (body 1) and the bone tissue, thereby playing a secondary adjustment role. This adjustment method results in a small incision and will not cause secondary damage to the patient's bone tissue.

[0037] The main body 1 includes a first support member 11 and a second support member 12. The first support member 11 and the second support member 12 are capable of relative movement. When the adjusting rod 2 is in the first adjusting position, the adjusting rod 2 can drive the first support member 11 and the second support member 12 to rotate simultaneously. At this time, the first support member 11 and the second support member 12 of the main body 1 can be regarded as a single unit. The first support member 11 is provided with a first thread 111; the second support member 12 is provided with a second thread 121. The pitch of the first thread 111 is smaller than the pitch of the second thread 121. When the first thread 111 and the second thread 121 rotate simultaneously, the axial force generated by the pitch difference causes the two bone blocks connected by the first thread 111 and the second thread 121 to be pulled together, thereby achieving the purpose of adjusting the distance between the two bone blocks.

[0038] Specifically, the first thread 111 connects to the first bone fragment, and the second thread 121 connects to the second bone fragment. The first thread 111 and the second thread 121 rotate in the same direction. Since the pitch of the first thread 111 is smaller than that of the second thread 121, a traction force is generated between the first and second bone fragments, thereby achieving the purpose of adjusting the distance between the two bone fragments. The specific operation is as follows: First, under the action of external force (usually the external force generated by the doctor on the adjusting rod 2), the main body 1 is drilled into the two bone fragments through the first adjustment position of the adjusting rod 2. At this time, the protrusions on the adjusting rod 2 are exactly matched with the concave parts of the main body 1. At the same time, rotating the second rotating rod 22 and the third rotating rod 23 of the adjusting rod 2 will rotate the first support 11 and the second support 12 of the main body 1, thus placing the main body 1 into the patient's fracture site. Then, through fine adjustment, the main body 1 is slightly rotated through the thread difference of the main body 1 to achieve fine adjustment, so that the two fractured bones are in the optimal positional relationship. The third thread 124 of the rotating rod 122 engages with the screw 166. When rotated clockwise, the rotating rod 122 and the screw 166 become increasingly tighter. Therefore, when the adjusting rod 2 is in the first adjusting position, it is only necessary to rotate the second rotating rod 22 and the third rotating rod 23 simultaneously to achieve the purpose of rotating the entire body 1. The first rotating rod 21 may or may not rotate. In this embodiment, the first rotating rod 21 does not play a role in the adjustment. In other embodiments, the first rotating rod 21, the second rotating rod 22, and the third rotating rod 23 can also be rotated simultaneously to achieve the same purpose.

[0039] It should be noted that the first adjustment position of the present invention refers to the positional relationship when the second rotating rod 22 and the third rotating rod 23 rotate simultaneously, or the positional relationship when the first rotating rod 21, the second rotating rod 22, and the third rotating rod 23 rotate simultaneously. When the adjusting rod 2 is in the first adjustment position, the first fixing hole 229 on the second rotating rod 22 and the second fixing hole 239 on the third rotating rod 23 are aligned. At this time, the pin 30 can be inserted from the first fixing hole 229 and the second fixing hole 239. After insertion, the rotational consistency of the second rotating rod 22 and the third rotating rod 23 can be guaranteed. In some other embodiments, the first rotating rod 21, the second rotating rod 22, and the third rotating rod 23 can also be fixed simultaneously by the pin 30, thus achieving the purpose of simultaneous rotation.

[0040] The rotation of the adjusting rod 2 drives the first thread 111 and the second thread 121 to rotate simultaneously, so that the first thread 111 and the second thread 121 of the body 1 are respectively connected to the two bone blocks. After continued rotation, the distance between the two bone blocks is finely adjusted by the pitch difference generated by the rotation, thereby achieving the purpose of adjusting the distance between the two bone blocks. At the same time, it also provides a stable holding force for the bone during the repositioning process, allowing the bone to be repositioned better. Usually, the screw can be stopped by the squeezing friction between the screw and the bone block at any position, thus fixing the bone block. The screw can be solid, which makes it more secure. However, in some cases or when fixing certain specific positions, the screw can also be hollow. The hollow design allows steel wire or titanium coils to pass through the middle of the screw for reinforcement or fixation of the bone block.

[0041] The first thread 111 and the second thread 121 of the main body 1 are used to surgically fix the distraction screw between the first and second bone blocks. The first end 112 includes a tip 113, which can be used to drill holes in either the first or second bone block, allowing the distraction screw to connect with the bone block. The tip 113 is the starting end of the distraction screw. During orthopedic surgery, the main body 1 is screwed between the two bone blocks using an adjusting rod 2, and at this time, the adjusting rod 2 is in the first adjusting position. At this time, the first support 11 and the second support 12 of the main body 1 can be screwed simultaneously. Simply put, the tip 113 of the main body 1 is gradually screwed into the bone tissue. As the adjusting rod 2 continuously rotates the main body 1, the main body 1 is eventually screwed completely into the bone tissue, so that both ends of the main body 1 are connected to the bone tissue. To make it easier to drive the distraction screw into the bone tissue, the first end is provided with two symmetrical tips 113, and the tips 113 are provided with arc segments 114. The arc segments 114 are connected to the starting end of the first thread 111. Through the smooth transition between the arc segments 114 and the first thread 111, the distraction screw can be smoothly driven into the bone tissue, and at the same time, it lays the foundation for further fine-tuning.

[0042] The first support member 11 also has a transition section with a smooth surface. This transition section ensures that the first thread 111 and the second thread 121 can respectively enter different bone blocks, thereby ensuring that the screw can open the bone blocks without damaging the tissue. Since the pitch of the first thread 111 is smaller than the pitch of the second thread 121, when the first thread 111 and the second thread 121 are rotated simultaneously, the first bone block connected to the first thread 111 moves more, while the second bone block connected to the second thread 121 moves less. This difference in the movement of the first and second bone blocks, meaning that the first and second bone blocks move relatively further apart or closer together, serves the purpose of fine-tuning the distance between the first and second bone blocks. The distance between the first and second bone blocks is adjusted by rotating the screw clockwise or counterclockwise. When adjusting clockwise, only the second rotating rod 22 and the third rotating rod 23 need to be rotated simultaneously to achieve the purpose of driving into the bone tissue or to reduce the distance between the first and second bone blocks. When adjusting counterclockwise, the first rotating rod 21, the second rotating rod 22, and the third rotating rod 23 need to be rotated simultaneously to increase the distance between the first and second bone blocks. Of course, both increasing and decreasing the distance between the first and second bone blocks are fine adjustments.

[0043] Figure 9This diagram illustrates the first rotating rod 21, the second rotating rod 22, and the third rotating rod 23 fixed together. The protrusions formed by these three rods correspond precisely to the grooves formed in the initial state of the main body 1. The specific correspondence is as follows: The end of the first support member 11 furthest from the first thread 111 is provided with a screw 116 having a first notch 115. The second end 212 of the first rotating rod 21 can engage with the first notch 115. Preferably, the second end 212 is in a straight line shape. The second support member 12 nests the rotating member 122 and the threaded member 123. The rotating member 122 and the threaded member 123 are smoothly connected, meaning they are separable. The rotating member 122 can rotate along the inner wall of the threaded member 123. The inner wall of the rotating member 122 is provided with a third thread 124 that can connect with the screw 116. The rotating member 122 is provided with four second notches 125. The second rotating rod 22 is cross-shaped, and its end is provided with a first protrusion 222 that can cooperate with the second notch 125. The four first protrusions 222 are also arranged in a cross shape and can be inserted into the second notch 125. The threaded part 123 is provided with a third notch 126. The two third notches 126 are in a straight line along the center of the threaded part 123. The third rotating rod 23 is provided with a second protrusion 231 that can cooperate with the third notch 126. The two second protrusions 231 are also symmetrically arranged at the arc position of the cross section of the third rotating rod 23. In the initial state, the rotating part 122 and the screw 116 are in a tightened state, and the first notch 115, the second notch 125 and the third notch 126 can form a straight line.

[0044] In this type of orthopedic surgery, the first thread 111 and the second thread 121 of the main body 1 are first fixed to the first and second bone fragments, respectively, to reposition the fractured first and second bone fragments. Since bone tissue regeneration requires continuous force to maintain the repositioned state for a certain period of time, the screw can serve as the holding force required for bone repositioning. Because bone tissue recovery is phased, patients need a certain recovery period after surgery and also need regular check-ups. If the patient experiences loss or abnormality in repositioning during the recovery period, the screw of this invention can play a secondary adjustment role. During the follow-up surgery, the incision is small, and there is no need to remove the screw. The distance between the two fractured and collapsed bone fragments can be changed simply by adjusting the rotating part.

[0045] Specifically, during the second operation, the adjusting rod 2 is first adjusted to the first adjustment position. At this point, the protrusions formed by the first rotating rod 21, the second rotating rod 22, and the third rotating rod 23 correspond exactly to the grooves formed in the initial state of the main body 1. After removing the pin 30, the first rotating rod 21, the second rotating rod 22, and the third rotating rod 23 can all rotate independently. During the operation, the doctor first aligns the protrusions of the adjusting rod 2 with the grooves formed in the initial state of the main body 1 and removes the pin 30. The second step involves operating the handle position of the adjusting rod 2, that is, holding the third handle 235 of the third rotating rod 23 and the first handle 215 of the first rotating rod 21 respectively, keeping the third handle 235 and the first handle 215 stationary, and rotating the second handle 225 of the second rotating rod 22 counterclockwise. At the same time, the screw 116 moves inward accordingly. The doctor also needs to apply an inward pushing force to the first rotating rod 21 to ensure that the second end 212 of the first rotating rod 21 is always locked in the screw 1. On the first notch 115 of 16, the rotating component 122 can rotate independently, thereby extending the length of the body 1. When the two bone tissues are supported to the appropriate distance for surgical repositioning, the rotation of the second rotating rod 22 stops. At this time, a certain gap is created after the rotating component and the screw move. The third step is to install the extension screw 3 in the gap position. At this time, the length of the extension screw 3 can be determined according to the distance adjusted during the actual operation of the patient. That is, the doctor can choose the length of the extension screw 3 according to the actual operation situation. The extension screw 3 can effectively seal the gap and prevent bone tissue from entering the gap of the body 1 during regeneration. In some preferred embodiments, the extension screw 3 is trumpet-shaped and includes a third end 31 and a fourth end 32. The cross-sectional size of the third end 31 is the same as that of the screw 116. An opening 33 is provided on the fourth end 32, and the cross-sectional area of ​​the fourth end 32 is larger than that of the third end 31. The second end 212 of the first rotating rod 21 can be inserted into the opening 33. During the installation of the extension screw 3, first place the extension screw 3 in the gap opening between the rotating part and the screw, and at the same time, align the protrusions of the second rotating rod 22 and the third rotating rod 23 with the recesses of the rotating part 122 and the threaded part 123. Keeping the second rotating rod 22 and the third rotating rod 23 stationary, rotate the first rotating rod 21 alone to install the extension screw 3 into the gap between the rotating part and the screw.

[0046] The extension screw 3 is essentially an expansion screw, inserted after the entire reduction process. Its main functions are tightening, fixing, and sealing the hollow hole. Because the fourth end 32 is slightly flared, when the extension screw 3 rotates into the rotating component 122, it generates an outward expansion pressure, causing the rotating component 122 to be compressed outwards. This prevents the rotating component 122 and the threaded component 123 from rotating, making the structure of the main body 1 more robust. Furthermore, the length of the extension screw 3 is typically between 3-5 mm, allowing the surgeon to select the appropriate length based on the patient's specific needs. After the surgery, the extension screw 3 fills any gaps left by the movement of the rotating component 122, simultaneously sealing the opening to prevent tissue growth from entering the screw during the fracture healing process.

[0047] Because the handles at the ends of the three rotating rods are relatively close together, the doctor can easily rotate the second rotating rod 22 individually by hand. During rotation, the first rotating rod 21 and the third rotating rod 23 may rotate slightly, but this rotation is considered to be within the allowable error range and will not affect the secondary adjustment or damage the connection between the main body 1 and the bone tissue. When the adjusting rod 2 is in the second adjustment position, the corresponding screw 116 and threaded component 123 remain stationary. Only the rotating component 122, fitted onto the screw 116, rotates independently. As the rotating component 122 rotates, it pushes against the threaded component 123 and slowly moves outward. At this time, the first support component 11 and the second support component 12 are extended. Meanwhile, the first external threads 111 and 121 on the outside of the first support component 11 and the second support component 12 remain stationary, preventing damage to the connection between the first external threads 111 and 121 and the bone tissue, thus avoiding secondary damage to the bone tissue. This state, where the first rotating rod 21 and the third rotating rod 23 remain stationary while only the second rotating rod 22 is rotated, can be considered the second adjustment position.

[0048] In summary, the main body of the present invention can not only fix two fractured bone fragments, but also adjust the distance between the two bone fragments through the difference in thread pitch, so that the bones can be better repositioned. It can also achieve secondary adjustment of the main body through the adjustment rod to adjust the distance between the two broken bones. Moreover, during the secondary adjustment, only the length of the main body is adjusted and the connection between the main body and the bone tissue is not adjusted, thereby avoiding secondary damage to the connected bone tissue caused by the main body 1.

[0049] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. A long-distance bone tissue adjustment device, characterized in that... The device includes a body and an adjusting rod. The body can expand or contract bone tissue. The adjusting rod has a first adjusting position and a second adjusting position. When the adjusting rod is in the first adjusting position, it can adjust the position of the body relative to the bone tissue and / or adjust the spacing between the bone tissues. When the adjusting rod is in the second adjusting position, it can adjust the length of the body and / or adjust the spacing between the bone tissues. The body includes a first support member and a second support member, which can move relative to each other. When the adjusting rod is in the first adjusting position, it can drive the first and second support members to rotate simultaneously. When the adjusting rod is in the second adjusting position, it can adjust the length of the first and second support members. The adjusting rod includes a first rotating rod, a second rotating rod, and a third rotating rod. The second rotating rod is sleeved outside the first rotating rod, and the third rotating rod is sleeved outside the second rotating rod. The first, second, and third rotating rods can rotate individually and / or together. The second rotating rod has a first fixing hole, and the third rotating rod has a second fixing hole. A pin can be inserted into or removed from the first and second fixing holes.

2. The bone tissue long-distance adjustment device according to claim 1, characterized in that... The first support member is provided with a first thread; the second support member is provided with a second thread, and the pitch of the first thread is smaller than the pitch of the second thread.

3. The long-distance bone tissue adjustment device according to claim 2, characterized in that... The first support member has a screw with a first notch at the end away from the first thread, and the first end of the first rotating rod can cooperate with the first notch.

4. The bone tissue long-distance adjustment device according to claim 3, characterized in that... The second support member includes a rotating member and a threaded member, which are rotatably connected. The inner wall of the rotating member is provided with a third thread that can be connected to the screw.

5. A long-distance bone tissue adjustment device according to claim 4, characterized in that... The rotating component is provided with a second notch, and the second rotating rod is provided with a first protrusion that can cooperate with the second notch.

6. A long-distance bone tissue adjustment device according to claim 4, characterized in that... The threaded part is provided with a third notch, and the third rotating rod is provided with a second protrusion that can cooperate with the third notch.

7. A long-distance bone tissue adjustment device according to claim 4, characterized in that... It also includes an extension screw, which can fill the gaps created by the movement of the rotating part and the screw and tighten the screw. After the extension screw is installed, the rotating part and the threaded part can be fixed.

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