Dynamic continuous compression intramedullary nail and methods of use

Abstract

The application relates to a dynamic continuous compression intramedullary nail and a use method thereof, and belongs to the medical instrument field. The dynamic continuous compression intramedullary nail comprises a main nail, a fixing through hole for placing a first fixing bolt is arranged on the main nail, a static through hole and a plurality of dynamic through holes matched with the fixing through hole are arranged on the main nail, a compression groove is arranged on the main nail, a compression assembly is arranged in the compression groove, and the static through hole and the dynamic through holes are used for placing second fixing bolts. According to the fracture condition of a patient, the second fixing bolts are placed in the static through hole or the dynamic through holes, the compression assembly continuously compresses the second fixing bolts in the dynamic through holes, the patient is not prone to bone resorption, bone subsidence and other phenomena at two fracture sections of bone healing, and the healing speed is accelerated. The application is especially suitable for ankle joint tibial tarsal calcaneal three-joint fusion fixation, responds to and adapts to the activity change of an ankle joint, achieves a dynamic fixation effect, and is also suitable for femoral head allogeneic material transplantation and other auxiliary fusion operations.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to an intramedullary nail that provides dynamic continuous compression and a method of using the same. Background Technology

[0002] Intramedullary nails are orthopedic internal fixation devices and are the preferred internal fixation for various long bone shaft fractures.

[0003] In related technologies, intramedullary nails have several through holes. During the use of intramedullary nails, medical staff place the nail at the fracture site, then pass the first fixation bolt through the through hole at the implanted end of the nail, and then pass the second fixation bolt through the through hole at the end of the nail to complete the installation between the intramedullary nail and the bone. For compression between the fracture lines, the locking mechanism at one end of the fracture line is usually first secured, and then the gap between the fracture surfaces is reduced by pushing the second fixation bolt at the other end or by pulling the main nail. After achieving good compression reduction, the second fixation bolt is inserted into the round hole of the main nail to ensure overall structural stability.

[0004] In common joint fusion procedures, bone resorption, nonunion at the fracture site, and allogeneic material transplantation are common issues. Especially during the recovery process, due to the unconscious movement of the limbs and the fixed position of the intramedullary nail's opening, the prestress inside the intramedullary nail is relatively small, making it easy for bone subsidence or bone resorption to occur at the fracture site, thus affecting the patient's recovery. Summary of the Invention

[0005] To address the aforementioned issues, this application provides an intramedullary nail that provides dynamic, continuous compression.

[0006] Firstly, this application provides a technical solution for providing a dynamically continuous compression intramedullary nail, employing the following technical solution:

[0007] An intramedullary nail that provides dynamic continuous compression includes a main nail, a fixing through hole for placing a first fixing bolt, a static through hole and a plurality of dynamic through holes that mate with the fixing through hole, a compression groove that communicates with the static through hole and each of the dynamic through holes along its own length, a compression component that is detachably connected to the compression groove, and a second fixing bolt that mates with the first fixing bolt being placed in each of the static through hole and the plurality of dynamic through holes.

[0008] When the second fixing bolt is in the static through hole, the pressure assembly separates from the main bolt. When the second fixing bolt is in the dynamic through hole, the pressure assembly continuously applies pressure to the second fixing bolt in the dynamic through hole.

[0009] By employing the above technical solution, when a patient's fracture needs repair, medical staff place the main nail at the fracture site and insert the first fixation bolt into the fixation through hole to secure one end of the main nail. Depending on the patient's condition, medical staff then install or remove the pressure assembly. When the second fixation bolt needs to be placed in the static through hole, the pressure assembly separates from the main nail, and the worker inserts the second fixation bolt into the static through hole to complete the fixation of the main nail. When the second fixation bolt needs to be placed in the dynamic through hole, the pressure assembly is located in the pressure groove, and the worker inserts the second fixation bolt into the corresponding dynamic through hole to complete the fixation of the main nail. The pressure assembly limits the second fixation bolt in the dynamic through hole and continuously applies pressure to the second fixation bolt, ensuring that the second fixation bolt is stably abutted against the dynamic through hole. This achieves the function of dynamically and continuously applying pressure to the fracture surface, reducing bone subsidence or bone resorption at the fracture site, thus facilitating a more stable recovery for the patient.

[0010] Preferably, the pressurizing assembly includes a connector, a movable column, and an elastic pressurizing member. The connector is threadedly connected to the pressurizing groove, the movable column is slidably connected to the pressurizing groove, one end of the elastic pressurizing member is connected to the connector, and the other end is connected to the movable column. The movable column has a clearance hole for the second fixing bolt to pass through.

[0011] By employing the above technical solution, when the main nail needs to be fixed, medical staff insert the second fixing bolt into either the static or dynamic through-hole, depending on the patient's condition. When the second bolt needs to be inserted into the dynamic through-hole, the medical staff controls the movement of the movable column, connecting the clearance hole on the movable column with the corresponding dynamic through-hole. The elastic pressure component is then in a stretched state, allowing the medical staff to use the second fixing bolt to fix the main nail. Under the rebound force of the elastic pressure component, the movable column applies limiting pressure to the second fixing bolt, ensuring more stable healing of the two bones at the fracture site. Furthermore, the threaded connection allows medical staff to select elastic pressure components with different elastic potential energies according to different clinical needs.

[0012] Preferably, the elastic pressure element is made of nickel-titanium alloy.

[0013] Preferably, the end of the connector near the movable column is connected to a first reinforcing column, the first reinforcing column is provided with a first spiral protrusion, and the end of the elastic pressure member away from the movable column is engaged with the first spiral protrusion.

[0014] By adopting the above technical solution, the first spiral protrusion increases the contact area between the elastic pressure member and the first reinforcing column, that is, increases the contact area between the elastic pressure member and the connector. In addition, the first spiral protrusion limits the elastic pressure member, thereby improving the connection stability between the elastic pressure member and the connector.

[0015] Preferably, a second reinforcing column is connected to one end of the movable column close to the connector. The second reinforcing column is provided with second spiral protrusions, and the end of the elastic pressing member away from the connector is clamped with the second spiral protrusions.

[0016] By adopting the above technical solution, the second spiral protrusions increase the contact area between the elastic pressing member and the second reinforcing column, that is, increase the contact area between the elastic pressing member and the movable column, and the second spiral protrusions limit the elastic pressing member, thereby improving the connection stability between the elastic pressing member and the movable column.

[0017] Preferably, the main nail includes a connecting needle and a pressing needle. The connecting needle is connected to the pressing needle. A fitting groove is formed in the connecting needle, and a pressing hole is formed in the pressing needle. The fitting groove and the pressing hole are communicated to form a pressing groove. The static through hole and each dynamic through hole are communicated with the pressing hole. The connector is threadedly connected to the inner wall of the fitting groove, and the movable column is slidably connected to the inner wall of the pressing hole. The diameter of the connecting needle is d1, and the diameter of the pressing needle is d2, and d1 < d2. A transition arc surface is formed on one side of the pressing needle close to the connecting needle.

[0018] By adopting the above technical solution, the connecting needle with a smaller diameter facilitates the medical staff to pass the main nail through the two fracture sections, and the pressing needle with a larger diameter facilitates the elastic pressing member to continuously provide pressure to the second fixing bolt more stably, so that the fixing part of the second fixing bolt is not easily deformed. At the same time, the transition arc surface reduces the resistance when the main nail is inserted into the two fracture sections of the patient's fracture, thereby providing convenience for the medical staff to use the main nail.

[0019] Preferably, a guiding arc surface is formed at one end of the connecting needle away from the pressing needle.

[0020] By adopting the above technical solution, the guiding arc surface facilitates the medical staff to move the intramedullary nail to the fracture of the patient.

[0021] In a second aspect, the present application provides a method for using a dynamic continuous pressure-providing intramedullary nail, adopting the following technical solution:

[0022] A method for using a dynamic continuous pressure-providing intramedullary nail includes the following steps:

[0023] Install or disassemble the pressing component according to the patient's clinical fracture condition;

[0024] Pass the main nail through the fracture of the patient;

[0025] Pass the first fixing bolt through the fixing through hole to fix one end of the main nail;

[0026] When the pressure assembly separates from the main nail, the second fixing bolt is controlled to pass through the static through hole and the clearance hole in sequence to fix the other end of the main nail;

[0027] When the pressurizing component is in the pressurizing groove, the moving column is moved by an external control component, so that the clearance hole is connected to the dynamic through hole at the corresponding position, and the second fixing bolt is controlled to pass through the dynamic through hole and the clearance hole at the corresponding position in sequence to fix the other end of the main nail.

[0028] By adopting the above technical solution, when medical staff use the main nail to treat the patient's fracture, they can choose between static or dynamic through-holes depending on the patient's condition. When the second fixation bolt needs to be inserted into the dynamic through-hole, the pressure assembly is located in the pressure groove. At this time, the pressure assembly can continuously apply pressure to the second fixation bolt in the dynamic through-hole, making the second fixation bolt more stably pressed against the dynamic through-hole. This improves the connection stability between the main nail and the patient's fracture site, and at the same time, it realizes the function of dynamic continuous pressure on the fracture surface, reducing the occurrence of bone subsidence or bone resorption at the fracture site, so as to facilitate a more stable recovery for the patient.

[0029] Preferably, the control component includes a support column and a connecting column, the connecting column is ball-jointed to the support column, the end of the moving column away from the connector is provided with a threaded groove, and a point of the connecting column away from the support column is threadedly connected to the inner wall of the threaded groove.

[0030] A control sleeve is fitted on the outer side of the connecting column. The connecting column is slidably connected to the inner wall of the control sleeve. A limiting plate is provided on the connecting column. A limiting groove is opened on the inner wall of the control sleeve. The limiting plate is slidably connected in the limiting groove. A travel limiting hole is opened on the control sleeve. A mating hole communicating with the travel limiting hole is opened on the moving column. A limiting rod is provided in the travel limiting hole. The limiting rod passes through the mating hole.

[0031] By adopting the above technical solution, when the second fixing bolt is needed to fix the main nail, medical staff insert the connecting post into the threaded groove, making the connecting post threadedly connected to the inner wall of the threaded groove, thus completing the fixation between the control post and the connecting post. The medical staff then move the support post away from the main nail. The support post drives the connecting post to move away from the main nail, and the connecting post then drives the moving post to move so that the clearance hole on the moving post connects with the corresponding dynamic through hole. The medical staff can then use the second fixing bolt to fix the main nail. During the movement of the connecting post, the medical staff holds the control sleeve, making the control sleeve press against the patient's bone. At the same time, the connecting post drives the limiting rod to move along the travel limiting hole. When the connecting post presses against the inner wall of the travel limiting hole, the control sleeve and the connecting post simultaneously provide limiting for the support post and the connecting post, applying a reaction force to the main nail. This makes it difficult for the moving post to cause the main nail to move as a whole during the movement, thus preventing the main nail from causing secondary damage to the patient's bone. It also facilitates the use of the second fixing bolt to fix the main nail.

[0032] Preferably, a return spring is wound around the connecting column, one end of the return spring is connected to the side of the limiting plate near the support column, and the other end is connected to the inner wall of the control sleeve.

[0033] By adopting the above technical solution, during the movement of the moving column, the moving column drives the limiting plate to move, and the limiting plate keeps the return spring in a compressed state. After the medical staff uses the second fixing bolt to fix the main nail, the medical staff controls the connecting column to separate from the moving column. At this time, under the action of the return spring's rebound force, the control sleeve can automatically return to its original position relative to the connecting column, so that the medical staff can continue to use the control component to control the moving column.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. By setting up an elastic pressure member, the elastic pressure member continuously applies pressure to the second fixing bolt, so that the second fixing bolt is stably pressed against the corresponding dynamic through hole, making it less likely for the patient to experience bone resorption, bone deposition, etc. at the two cross-sections of bone healing, thus accelerating the patient's healing speed.

[0036] 2. By setting the first spiral protrusion and the second spiral protrusion, the contact area between the elastic pressure member and the connector and the moving column is increased, and the two ends of the elastic pressure member are limited, thereby improving the connection stability between the elastic pressure member and the connector and the moving column.

[0037] 3. By setting a control sleeve and a limiting rod, the main pin is limited, making it difficult for the connecting post to move the main pin during the movement of the control column. This reduces the possibility of the main pin causing secondary damage to the patient's bone and also provides convenience for medical staff to fix the main pin with a second fixing bolt. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0039] Figure 2 yes Figure 1 Enlarged structural diagram of section A in the middle;

[0040] Figure 3 yes Figure 1 Enlarged structural diagram of section B in the middle;

[0041] Figure 4 This is a structural schematic diagram illustrating the positional relationship between the control component and the master nail in an embodiment of this application;

[0042] Figure 5 yes Figure 4 Enlarged structural diagram of section C.

[0043] Explanation of reference numerals in the attached drawings: 1. Main nail; 11. Fixing through hole; 111. First fixing bolt; 12. Static through hole; 13. Dynamic through hole; 14. Pressure groove; 15. Connecting pin; 151. Mating groove; 152. Guide arc surface; 16. Pressure pin; 161. Pressure hole; 162. Transition arc surface; 2. Pressure assembly; 21. Connector; 211. First reinforcing column; 212. First spiral protrusion; 22. Moving column; 221. Displacement hole; 222. Second reinforcing column; 223. Second spiral protrusion; 224. Threaded groove; 23. Elastic pressure component; 3. Second fixing bolt; 4. Plug; 5. Control assembly; 51. Support column; 52. Connecting column; 521. Limiting plate; 522. Mating hole; 6. Control sleeve; 61. Limiting groove; 62. Stroke limiting hole; 63. Limiting rod; 7. Return spring. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0045] This application discloses an intramedullary nail that provides dynamic continuous compression. (Refer to...) Figure 1An intramedullary nail providing dynamic continuous pressure includes a main nail 1. The main nail 1 has a fixing through-hole 11 for placing a first fixing bolt 111. The main nail 1 also has static through-holes 12 and several dynamic through-holes 13 that mate with the fixing through-hole 11. Both the static through-holes 12 and the dynamic through-holes 13 are used to place second fixing bolts 3. A pressure groove 14 is formed along the length of the main nail 1, communicating with the static through-holes 12 and each of the dynamic through-holes 13. A pressure assembly 2 is detachably connected to the pressure groove 14, and the pressure assembly 2 provides dynamic continuous pressure to the second fixing bolts 3 in the dynamic through-holes 13.

[0046] When the second fixing bolt 3 is located in the static through hole 12, the pressure assembly 2 is separated from the main nail 1, and the second fixing bolt 3 is set to one; when the second fixing bolt 3 is located in the dynamic through hole 13, the pressure assembly 2 is located in the pressure groove 14, the second fixing bolt 3 is set to several, and each dynamic through hole 13 is correspondingly provided with one second fixing bolt 3.

[0047] Medical staff insert the first fixation bolt 111 through the fixation through hole 11 to fix one end of the main nail 1. Then, based on the patient's clinical fracture condition, a corresponding number of second fixation bolts 3 are inserted into the corresponding static through hole 12 or dynamic through hole 13 to fix the other end of the main nail 1. When the second fixation bolt 3 is in the static through hole 12, the pressure assembly 2 is separated from the main nail 1; when the second fixation bolt 3 is in the dynamic through hole 13, the pressure assembly 2 is located in the pressure groove 14. At this time, the pressure assembly 2 provides dynamic and continuous pressure to the second fixation bolt 3 in the dynamic through hole 13, so that the second fixation bolt 3 is more stably pressed against the corresponding dynamic through hole 13. At the same time, it makes it less likely for bone resorption and bone deposition to occur at the two fracture surfaces of bone healing, thereby accelerating the patient's healing speed.

[0048] Reference Figure 1 and Figure 2 To facilitate the insertion of the main nail 1 into the patient's fracture site, the main nail 1 includes a connecting pin 15 and a compression pin 16, with a connecting post 52 fixed to the compression pin 16. The connecting pin 15 has a mating groove 151, and the compression pin 16 has a compression hole 161. The mating groove 151 and the compression hole 161 are connected to form a compression groove 14. A fixed through hole 11 is provided on the connecting pin 15, and static through holes 12 and various dynamic through holes 13 are all provided on the compression pin 16 and connected to the compression hole 161.

[0049] The connecting pin 15 has a guide arc surface 152 at the end away from the pressure pin 16, and the pressure pin 16 has a transition arc surface 162 at the side near the connecting pin 15. The diameter of the connecting pin 15 is d1, and the diameter of the pressure pin 16 is d2. <d2。

[0050] During the insertion of the main nail 1 into the fracture site by medical personnel, the guide arc surface 152 guides the connecting pin 15, reducing the resistance when the connecting pin 15 is inserted into the patient's fracture site. Furthermore, the transition arc surface 162 guides the compression pin 16, reducing the resistance when the compression pin 16 is inserted into the patient's fracture site, thus facilitating the insertion of the main nail 1 into the patient's fracture site by medical personnel. Simultaneously, the larger diameter compression pin 16 allows the elastic compression member 23 to stably and continuously apply pressure to the second fixing bolt 3 in the dynamic through hole 13, making the fixing point of the second fixing bolt 3 less prone to deformation.

[0051] Reference Figure 1 The pressurizing assembly 2 includes a connector 21, a movable column 22, and an elastic pressurizing element 23. The connector 21 is disposed in a mating groove 151 and threadedly connected to the inner wall of the mating groove 151. The movable column 22 is slidably connected in a pressurizing hole 161. One end of the elastic pressurizing element 23 is connected to the connector 21, and the other end is connected to the movable column 22. The movable column 22 has a clearance hole 221 for the second fixing bolt 3 to pass through. The threaded connector 21 facilitates medical personnel in separating the pressurizing assembly 2 from the main nail 1, and also allows medical personnel to use elastic pressurizing elements 23 with different elastic potential energies according to the patient's condition.

[0052] The elastic pressure member 23 is made of nickel-titanium alloy, which has a large elastic potential energy, so as to provide relatively stable and continuous pressure on the second fixing bolt 3. The elastic pressure member 23 can be set as a round spring or a flat spring. In the actual use of the embodiments of this application, the elastic pressure member 23 is set as a flat spring.

[0053] Reference Figure 2 and Figure 3 To improve the connection stability between the connector 21, the moving post 22, and the elastic pressure member 23, a first reinforcing post 211 is fixed to the end of the connector 21 near the moving post 22. A first spiral protrusion 212 is fixed to the first reinforcing post 211, and the end of the elastic pressure member 23 away from the moving post 22 is engaged with the first spiral protrusion 212. A second reinforcing post 222 is fixed to the end of the moving post 22 near the connector 21. A second spiral protrusion 223 is fixed to the second reinforcing post 222, and the end of the elastic pressure member 23 away from the first spiral protrusion 212 is engaged with the second spiral protrusion 223. The first spiral protrusion 212 provides a limit to one end of the elastic pressure member 23, increasing the contact area between the elastic pressure member 23 and the connector 21, and improving the connection stability between the elastic pressure member 23 and the connector 21; the second spiral protrusion 223 provides a limit to the other end of the elastic pressure member 23, increasing the contact area between the elastic pressure member 23 and the moving column 22, and improving the connection stability between the elastic pressure member 23 and the moving column 22.

[0054] After medical staff place the main nail 1 at the patient's fracture site, they pass the first fixation bolt 111 through the fixation through hole 11 to fix one end of the main nail 1 to the patient's fracture site. The medical staff then control the movement of the movable column 22, connecting the clearance hole 221 on the movable column 22 with the corresponding dynamic through hole 13. At this time, the elastic pressure member 23 is in a stretched state. After the medical staff passes the second fixation bolt 3 through the corresponding dynamic through hole 13, they release the movable column 22. Under the action of the elastic pressure member 23's rebound force, a tensile force is applied to the movable column 22, so that the movable column 22 continuously presses the second fixation bolt 3, making the second fixation bolt 3 more stably pressed against the corresponding dynamic through hole 13. This achieves the function of dynamically and continuously pressing the fracture surface, reducing bone subsidence or bone resorption at the patient's fracture site, and accelerating the patient's recovery.

[0055] Reference Figure 1 The end of the pressure needle 16 furthest from the connecting needle 15 is threaded with a plug 4, which is threaded into the inner wall of the pressure hole 161. After the medical staff uses the second fixing bolt 3 to fix the other end of the main nail 1, the medical staff inserts the plug 4 into the pressure hole 161, so that the plug 4 is threaded into the inner wall of the pressure hole 161. At this time, the plug 4 can seal the pressure groove 14, making it difficult for external impurities to enter the pressure groove 14, reducing the possibility of damage to the elastic pressure component 23, and making the second fixing bolt 3 more stably pressed against the corresponding dynamic through hole 13.

[0056] The implementation principle of a dynamic continuous compression intramedullary nail according to an embodiment of this application is as follows: When treatment is needed at a patient's fracture site, medical staff install or remove the compression component 2 according to the patient's condition. When the patient's condition is good, the worker separates the compression component 2 from the main nail 1; when the patient's condition is poor, the worker installs the compression component 2 into the compression groove 14. The medical staff then inserts the main nail 1 into the patient's fracture site, and then passes the first fixing bolt 111 through the fixing through hole 11 to fix one end of the main nail 1 to the patient's fracture site. Then, the moving column 22 is moved so that the clearance hole 221 on the moving column 22 connects with the corresponding dynamic through hole 13, and then the second fixing bolt 3 passes through the corresponding dynamic through hole 13 to fix the other end of the main nail 1 to the patient's fracture site, thereby completing the fixation of the main nail 1 to the patient's fracture site. At this time, under the action of the elastic pressure member 23, the moving column 22 limits the second fixing bolt 3, so that the second fixing bolt 3 is relatively stably pressed against the corresponding dynamic through hole 13, realizing the function of dynamic continuous pressure on the fracture surface, reducing the phenomenon of bone subsidence or bone resorption at the fracture site, thereby accelerating the healing speed of the fracture site.

[0057] This application also discloses a method for using an intramedullary nail that provides dynamic continuous compression, applicable to the aforementioned intramedullary nail that provides dynamic continuous compression, mainly including the following steps:

[0058] Install or remove the pressure assembly 2 according to the patient's clinical fracture condition;

[0059] Pass the connecting needle 15 and the pressure needle 16 through the patient's fracture site in sequence;

[0060] Pass the first fixing bolt 111 through the fixing through hole 11 to fix one end of the main nail 1;

[0061] When the pressure assembly 2 separates from the main nail 1, the control second fixing bolt 3 passes through the static through hole 12 and the relief hole 221 in sequence to fix the other end of the main nail 1;

[0062] When the pressurizing component 2 is in the pressurizing groove 14, the external control component 5 is used to control the movement of the moving column 22, so that the clearance hole 221 is connected to the dynamic through hole 13 at the corresponding position, and the second fixing bolt 3 is controlled to pass through the dynamic through hole 13 and the clearance hole 221 at the corresponding position in sequence to fix the other end of the main nail 1.

[0063] Reference Figure 4 and Figure 5 The control component 5 includes a support column 51 and a connecting column 52. The connecting column 52 is ball-hinged to the support column 51. The end of the moving column 22 away from the main pin 1 has a threaded groove 224. The end of the connecting column 52 away from the support column 51 extends into the threaded groove 224 and is threadedly connected to the inner wall of the threaded groove 224.

[0064] A control sleeve 6 is fitted onto the outer side of the connecting column 52. The connecting column 52 is slidably connected to the inner wall of the control sleeve 6, and a limit plate 521 is fixed on the connecting column 52. A limit groove 61 is formed on the inner wall of the control sleeve 6, and the limit plate 521 is slidably connected in the limit groove 61. A travel limit hole 62 is formed on the control sleeve 6, and a mating hole 522 is formed on the moving column 22 that communicates with the travel limit hole 62. A limit rod 63 is set in the travel limit hole 62, and the limit rod 63 passes through the mating hole 522.

[0065] When the second fixing bolt 3 needs to be installed into the dynamic through hole 13, the medical staff inserts the connecting post 52 into the threaded groove 224, so that the connecting post 52 is threadedly connected to the inner wall of the threaded groove 224. Then, the support post 51 is pulled away from the main nail 1. The support post 51 drives the connecting post 52 to move away from the main nail 1. The connecting post 52 then drives the moving post 22 to move away from the main nail 1, so that the clearance hole 221 on the moving post 22 is connected to the corresponding dynamic through hole 13. At this time, the medical staff can insert the second fixing bolt 3 into the corresponding dynamic through hole 13. While the medical staff moves the support column 51, they hold the control sleeve 6 and press it against the main nail 1. During the movement of the connecting column 52, the connecting column 52 drives the limiting rod 63 to move along the travel limiting hole 62. When the limiting rod 63 presses against the inner wall of the travel limiting hole 62, the limiting rod 63 and the control sleeve 6 can limit the connecting column 52 and the support column 51, that is, apply a reaction force to the main nail 1. This makes it difficult for the moving column 22 to move the main nail 1 during the movement, reducing the possibility of secondary damage to the patient's bones caused by repeated movement of the main nail 1. At the same time, it provides convenience for the medical staff to control the movement of the moving column 22.

[0066] Reference Figure 4 and Figure 5 To facilitate the automatic reset of the control sleeve 6, a reset spring 7 is fitted on the connecting column 52. The reset spring 7 is located inside the control sleeve 6, with one end connected to the limit plate 521 and the other end connected to the inner wall of the control sleeve 6.

[0067] During the movement of the movable column 22 controlled by medical staff, the control sleeve 6 remains stationary relative to the movable column 22, and the return spring 7 is compressed. After the medical staff uses the second fixing bolt 3 to fix the other end of the main nail 1, the medical staff controls the connecting column 52 to separate from the movable column 22. At this time, under the action of the return spring 7, the control sleeve 6 automatically returns to its original position relative to the connecting column 52, so that the medical staff can continue to use the control component 5 to move the movable column 22.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An intramedullary nail that provides dynamic continuous compression, characterized in that: Includes a main nail (1), on which a fixing through hole (11) for placing a first fixing bolt (111) is provided, and on which a static through hole (12) and several dynamic through holes (13) are provided that cooperate with the fixing through hole (11), and on which a pressure groove (14) communicating with the static through hole (12) and each of the dynamic through holes (13) is provided along its own length direction, and a pressure assembly (2) is detachably connected in the pressure groove (14), and the static through hole (12) and several dynamic through holes (13) are all used to place a second fixing bolt (3) that cooperates with the first fixing bolt (111); When the second fixing bolt (3) is located in the static through hole (12), the pressure assembly (2) is separated from the main nail (1). When the second fixing bolt (3) is located in the dynamic through hole (13), the pressure assembly (2) continuously applies pressure to the second fixing bolt (3) in the dynamic through hole (13). The pressurizing assembly (2) includes a connector (21), a movable column (22), and an elastic pressurizing member (23). The connector (21) is threadedly connected to the pressurizing groove (14), and the movable column (22) is slidably connected to the pressurizing groove (14). One end of the elastic pressurizing member (23) is connected to the connector (21), and the other end is connected to the movable column (22). The movable column (22) has a clearance hole (221) for the second fixing bolt (3) to pass through. It also includes a control component (5), which includes a support column (51) and a connecting column (52). The connecting column (52) is ball-jointed to the support column (51). The moving column (22) has a threaded groove (224) at one end away from the connector (21). A point of the connecting column (52) away from the support column (51) is threaded to the inner wall of the threaded groove (224). A control sleeve (6) is sleeved on the outside of the connecting column (52). The connecting column (52) is slidably connected to the inner wall of the control sleeve (6). A limiting plate (521) is provided on the connecting column (52). A limiting groove (61) is opened on the inner wall of the control sleeve (6). The limiting plate (521) is slidably connected in the limiting groove (61). A stroke limiting hole (62) is opened on the control sleeve (6). A mating hole (522) communicating with the stroke limiting hole (62) is opened on the moving column (22). A limiting rod (63) is provided in the stroke limiting hole (62). The limiting rod (63) passes through the mating hole (522). A reset spring (7) is wound around the connecting column (52). One end of the reset spring (7) is connected to the side of the limiting plate (521) near the support column (51), and the other end is connected to the inner wall of the control sleeve (6).

2. The intramedullary nail providing dynamic continuous compression according to claim 1, characterized in that: The elastic pressure element (23) is made of nickel-titanium alloy.

3. The intramedullary nail providing dynamic continuous compression according to claim 1, characterized in that: One end of the connector (21) close to the moving column (22) is connected with a first reinforcing column (211). A first spiral protrusion (212) is provided on the first reinforcing column (211). One end of the elastic pressing member (23) away from the moving column (22) is snap-fitted with the first spiral protrusion (212).

4. An intramedullary nail that provides dynamic continuous compression according to claim 3, characterized in that: One end of the moving column (22) close to the connector (21) is connected with a second reinforcing column (222). A second spiral protrusion (223) is provided on the second reinforcing column (222). One end of the elastic pressing member (23) away from the connector (21) is snap-fitted with the second spiral protrusion (223).

5. An intramedullary nail that provides dynamic continuous compression according to claim 1, characterized in that: The main nail (1) includes a connecting needle (15) and a pressing needle (16). The connecting needle (15) is connected with the pressing needle (16). A fitting groove (151) is formed in the connecting needle (15). A pressing hole (161) is formed in the pressing needle (16). The fitting groove (151) and the pressing hole (161) are communicated with each other to form a pressing groove (14). The static through hole (12) and each dynamic through hole (13) are both communicated with the pressing hole (161). The connector (21) is threadedly connected with the inner wall of the fitting groove (151). The moving column (22) is slidably connected with the inner wall of the pressing hole (161). The diameter of the connecting needle (15) is d1, and the diameter of the pressing needle (16) is d2, where d1 < d2. A transition arc surface (162) is formed on one side of the pressing needle (16) close to the connecting needle (15).

6. An intramedullary nail that provides dynamic continuous compression according to claim 5, characterized in that: A guiding arc surface (152) is formed at one end of the connecting needle (15) away from the pressing needle (16).

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