Femoral fracture reduction device

Abstract

The femoral fracture reduction device comprises a first medullary nail, a second medullary nail and a control assembly, and one end of the first medullary nail is provided with an extension cavity; the second medullary nail comprises a main rod and an extension rod connected to the main rod, the extension rod is inserted into the extension cavity, a fixing hole is formed in the end, away from the extension rod, of the main rod, and a control hole communicating with the peripheral face of the extension rod is formed in the end, away from the main rod, of the extension rod. The second medullary nail further comprises a control channel communicated with the fixing hole and the control hole. The control assembly comprises a control rod slidably arranged in the control channel in a penetrating mode and a control piece arranged in the control hole, the control piece is in transmission connection with the control rod, an adjusting hole is formed in the end, away from the control piece, of the control rod, and at least part of the adjusting hole coincides with the fixing hole. The control assembly has a first state and a second state.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, in particular to a femoral fracture reduction device. Background Art

[0002] In orthopedic treatment, a lengthening intramedullary nail (LIN) is a specially designed, adjustable-length internal fixation device. Its core function is to maintain the stability of a fracture or osteotomy while lengthening the bone to restore limb length or correct deformity. For example, in children whose bones have not yet closed (the epiphysis is still active), traditional fixation devices (such as plates or conventional ILNs) may restrict longitudinal bone growth, leading to limb shortening or angular deformities. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a femoral fracture reduction device that can meet the needs of longitudinal bone production and reduce the occurrence of sequelae.

[0004] A femoral fracture reduction device according to an embodiment of the present invention comprises: a first medullary nail having an extension cavity at one end; a second medullary nail comprising a main rod and an extension rod connected to the main rod, the extension rod being inserted into the extension cavity, the main rod having a fixing hole at one end away from the extension rod, the extension rod having a control hole connected to an outer peripheral surface of the extension rod at one end away from the main rod, the second medullary nail further comprising a control channel connecting the fixing hole and the control hole; a control assembly comprising a control rod slidably disposed in the control channel and a control member disposed in the control hole, the control member being transmission-connected to the control rod, an end of the control rod remote from the control member having an adjustment hole, at least a portion of the adjustment hole coinciding with the fixing hole, the control assembly having a first state and a second state; In which, a cross section perpendicular to the axial direction of the fixing hole is defined as a projection plane, and the control component is configured as follows: in the first state, a portion of a first projection of the fixing hole on the projection plane is located outside a second projection of the adjustment hole on the projection plane, and the control member abuts against the extension cavity and fixes the first and second medullary nails; in the second state, the first projection is located within the second projection, the control member does not abut against the extension cavity, or the abutment force of the control member against the extension cavity is reduced, and the first and second medullary nails can move relative to each other along the axial direction of the extension rod.

[0005] The femoral fracture reduction device according to the embodiment of the present invention has at least the following beneficial effects: During orthopedic treatment, the control component is in the first state, and the first medullary nail and the second medullary nail will be connected as a whole, so that medical staff can implant the first medullary nail and the second medullary nail into the medullary cavity of the femur together. After implantation and alignment of the fracture position, the first medullary nail and the second medullary nail are nailed into the femur through the fixing nail to achieve correction and fixation of the fracture position. When the fixing nail is inserted into the fixing hole of the second medullary nail, the side of the fixing nail will push the adjustment hole to align with the fixing hole, and make the control rod move along the axial direction of the extension rod, and link the control member to move, so that the control member does not abut against the extension cavity or the force of abutting against the extension cavity is reduced. The control component changes from the first state to the second state, and the first medullary nail and the second medullary nail can move along the axial direction of the extension rod, thereby meeting the needs of longitudinal growth of the femur without easily causing sequelae.

[0006] According to some embodiments of the present invention, the extension rod is configured to limit circumferential rotation along the extension cavity.

[0007] According to some embodiments of the present invention, the main rod has a plurality of fixing holes, and the plurality of fixing holes are sequentially distributed in a direction away from the first medullary nail; The control rod has a plurality of adjustment holes, which are sequentially distributed in a direction away from the first medullary nail, and each adjustment hole corresponds to a fixing hole; Wherein, the control component is configured such that, in the first state, the overlapping portion between the first projection and the second projection decreases sequentially along a direction away from the first medullary nail.

[0008] According to some embodiments of the present invention, one end of the control member is rotatably connected to one end of the control rod, the middle part of the control member is rotatably connected to the extension rod, and the other end of the control member can extend outside the extension rod and abut against the extension cavity.

[0009] According to some embodiments of the present invention, the other end of the control member has a friction layer; Wherein, the control component is configured as follows: in the first state, the control member squeezes the friction layer to the inner circumference of the extension cavity; in the second state, the control member does not squeeze the friction layer, or the squeezing force applied by the control member to the friction layer is reduced.

[0010] According to some embodiments of the present invention, the friction layer comprises a barb layer along a direction away from the first medullary nail.

[0011] According to some embodiments of the present invention, the other end of the control member is arranged toward the other end of the control rod, and the control assembly further comprises a first elastic member arranged between the control rod and the control member; Wherein, the control component is configured as follows: in the first state, the first elastic member is in a first compressed state; in the second state, the first elastic member is in a second compressed state, and the elastic potential energy of the second compressed state is greater than the elastic potential energy of the first compressed state.

[0012] According to some embodiments of the present invention, one end of the control member is rotatably connected to one end of the control rod through a waist-shaped hole.

[0013] According to some embodiments of the present invention, the device further comprises: a second elastic member, the second elastic member being provided in the control channel and being provided between the control member and the extension rod along the axial direction of the extension rod; The second elastic member is configured as follows: in the first state, the second elastic member is in a third compressed state; in the second state, the second elastic member is in the fourth compressed state, and the elastic potential energy of the fourth compressed state is greater than the elastic potential energy of the first compressed state.

[0014] According to some embodiments of the present invention, the first medullary nail further includes a sealing member disposed within the extension cavity along a circumference of the extension cavity, and the sealing member is closer to an outlet of the extension cavity than the control member.

[0015] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 This is a schematic structural diagram of a femoral fracture reduction device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the exploded structure of a femoral fracture reduction device according to an embodiment of the present invention; Figure 3 for Figure 2 A partial enlarged schematic diagram of part A; Figure 4 This is a schematic cross-sectional view of a femoral fracture reduction device according to an embodiment of the present invention; Figure 5 for Figure 4 A partial enlarged schematic diagram of part B; Figure 6 It is a cross-sectional flow diagram of the control component in the femoral fracture reduction device according to one embodiment of the present invention shifting from a first state to a second state; Figure 7 for Figure 6 A partial enlarged schematic diagram of part C in the middle; Figure 8 The figure is a schematic cross-sectional structural diagram showing the relative position changes of the fixing hole and the adjustment hole in a femoral fracture reduction device according to an embodiment of the present invention.

[0017] Figure Number: First medullary nail 100; extension cavity 110; locking hole 120; sealing member 130; Second medullary nail 200; main rod 210; fixing hole 211; extension rod 220; control hole 221; control channel 230; Control assembly 300; control rod 310; adjustment hole 311; control member 320; friction layer 321; first elastic member 330; The second elastic member 400 . DETAILED DESCRIPTION

[0018] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0019] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying 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 a limitation on the present invention.

[0020] In the description of the present invention, "a number" refers to one or more, and "a plurality" refers to two or more. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly indicating the number or order of the technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0022] Reference Figures 1 to 8 As shown, an embodiment of the present invention provides a femoral fracture reduction device, comprising: a first medullary nail 100 , a second medullary nail 200 and a control assembly 300 .

[0023] In this embodiment, a first medullary nail 100 has an extension cavity 110 at one end, and a locking hole 120 is formed on the outer circumference of the other end of the first medullary nail 100. The locking hole 120 is used to receive a fixing nail, thereby securing the other end of the first medullary nail 100 to the femur. The cross-section of the extension cavity 110 along its axis is non-circular, and specifically, the cross-section can be a polygon such as a triangle, a rectangle, or an ellipse, or a combination of a circle and a polygon such as a triangle.

[0024] The second medullary nail 200 includes a main rod 210 and an extension rod 220 connected to the main rod 210. The extension rod 220 is inserted into the extension cavity 110. The main rod 210 has a fixing hole 211 at one end away from the extension rod 220. The extension rod 220 has a control hole 221 at one end away from the main rod 210 that communicates with the outer circumference of the extension rod 220. The second medullary nail 200 also includes a control channel 230 that communicates with the fixing hole 211 and the control hole 221. After the first medullary nail 100 and the second medullary nail 200 are inserted into the medullary cavity together, the outer circumference of the main rod 210 and the outer circumference of the first medullary nail 100 come into contact with the tissue in the medullary cavity, while the extension rod 220 is inserted into the extension cavity 110, separating the extension rod 220 from the tissue in the medullary cavity.

[0025] The control assembly 300 includes a control rod 310 that is slidably provided in the control channel 230 and a control member 320 that is provided in the control hole 221. The control member 320 is connected to the control rod 310 in a transmission manner. The end of the control rod 310 away from the control member 320 has an adjustment hole 311. At least a portion of the adjustment hole 311 coincides with the fixing hole 211. The control assembly 300 has a first state and a second state. In the embodiment, a cross section perpendicular to the axial direction of the fixing hole 211 is defined as a projection surface. The control assembly 300 is configured as follows: In the first state, the first projection of the fixing hole 211 on the projection plane is located outside the second projection of the adjustment hole 311 on the projection plane, the control member 320 abuts against the extension cavity 110, and fixes the first medullary nail 100 and the second medullary nail 200; in the second state, the first projection is located within the second projection, the control member 320 does not abut against the extension cavity 110, or the abutting force of the control member 320 against the extension cavity 110 is reduced, and the first medullary nail 100 and the second medullary nail 200 can move relative to each other along the axial direction of the extension rod 220.

[0026] The adjusting hole 311 is coaxially arranged with the fixing hole 211, but the distance between the axis of the adjusting hole 311 and the axis of the fixing hole 211 can be adjusted. In this embodiment, the fixing hole 211 is used for inserting a fixing nail, and a portion of the first projection is located outside the second projection, wherein the projection of the axis of the adjusting hole 311 and the projection of the axis of the fixing hole 211 are both located within the overlapping range of the first projection and the second projection, so that when the fixing nail is inserted along the axis of the fixing hole 211, the end of the fixing nail can pass through the adjusting hole 311 without being stopped by the control rod 310. After the end of the fixing nail passes through the adjusting hole 311, the side surface of the fixing nail will abut against the inner circumferential surface of the adjusting hole 311. During the insertion process of the fixing nail, the side surface of the fixing nail will push the inner circumferential surface of the adjusting hole 311 to move along the axial direction of the extension rod 220. In other words, the fixing nail pushes the control rod 310 to move along the axial direction of the extension rod 220, thereby realizing the movement of the control rod 310.

[0027] Among them, the movement of the control rod 310 will be transmitted to the control member 320, so that the state between the control member 320 and the inner circumference of the extension cavity 110 changes, thereby reducing the connection tightness between the control member 320 and the extension cavity 110. In other words, the connection tightness between the first medullary nail 100 and the second medullary nail 200 is reduced, and the first medullary nail 100 and the second medullary nail 200 can move along the axial direction of the extension rod 220, so that the patient's bones can grow along its longitudinal direction to avoid sequelae.

[0028] It is worth noting that, during orthopedic treatment, the control assembly 300 is in the first state, and the first medullary nail 100 and the second medullary nail 200 are connected as a whole, so that the medical staff can implant the first medullary nail 100 and the second medullary nail 200 into the medullary cavity of the femur together. After implantation and alignment of the fracture position, the first medullary nail 100 and the second medullary nail 200 are nailed into the femur through the fixing nail to achieve correction and fixation of the fracture position. When the fixing nail is inserted into the fixing hole 211 of the second medullary nail 200, the fixing nail is inserted into the fixing hole 211 of the second medullary nail 200. The side surface will push the adjustment hole 311 to align with the fixing hole 211, and make the control rod 310 move along the axial direction of the extension rod 220, and link the control member 320 to move, so that the control member 320 does not abut against the extension cavity 110 or the force of abutting against the extension cavity 110 is reduced, and the control assembly 300 changes from the first state to the second state, and the first medullary nail 100 and the second medullary nail 200 can move along the axial direction of the extension rod 220, thereby meeting the needs of the longitudinal growth of the femur without easily causing sequelae.

[0029] In addition, before the operation, medical staff can also insert a fixing nail into the fixing hole 211 so that the first medullary nail 100 and the second medullary nail 200 can move relative to each other along the axial direction of the extension rod 220, and then adjust the overall length of the first medullary nail 100 and the second medullary nail 200, so that the overall length of the femoral fracture reduction device is more adapted to the patient's femur length, thereby improving the applicability of the femoral fracture reduction device.

[0030] In addition, when the femoral fracture reduction device needs to be removed from the patient's body, after the fixing nail is removed, the control rod 310 is automatically reset, so that the control component 300 is changed from the second state to the first state, thereby making the first medullary nail 100 and the second medullary nail 200 relatively fixed, making it easier for medical staff to remove the first medullary nail 100 and the second medullary nail 200 together.

[0031] Reference Figure 1 and Figure 2 As shown, in some specific embodiments of the present invention, the extension rod 220 is configured to limit the circumferential rotation along the extension cavity 110 .

[0032] In this embodiment, the cross-sectional shape of the extension rod 220 along its axial direction is a rectangle, and the cross-sectional shape of the extension cavity 110 along its axial direction is a rectangle. After the extension rod 220 is inserted into the extension cavity 110, it is difficult to rotate along the circumferential direction of the extension cavity 110, so that the extension rod 220 mainly moves along the axial direction of the extension cavity 110, and then the first medullary nail 100 and the second medullary nail 200 are mainly extended along the axial direction of the extension cavity 110, and adapt to the longitudinal growth of the patient's bones, which is more conducive to the patient's recovery.

[0033] Reference Figure 8 As shown, in some specific embodiments of the present invention, the main rod 210 has a plurality of fixing holes 211, and the plurality of fixing holes 211 are sequentially distributed in a direction away from the first medullary nail 100; the control rod 310 has a plurality of adjustment holes 311, and the plurality of adjustment holes 311 are sequentially distributed in a direction away from the first medullary nail 100, and each adjustment hole 311 corresponds to a fixing hole 211; wherein, the control component 300 is configured such that: in the first state, along the direction away from the first medullary nail 100, the overlapping portion of the first projection and the second projection decreases sequentially.

[0034] In this embodiment, the axial movement path of the control rod 310 along the extension cavity 110 is divided into multiple sections and is adjusted through the adjustment holes 311 in the multiple fixing holes 211. One adjustment hole 311 corresponds to a section of the movement path of the control rod 310. When all the fixing holes 211 have fixing pins, each adjustment hole 311 drives the control rod 310 to move a section of the movement path, and all the adjustment holes 311 realize the movement of the control rod 310 along all the movement paths.

[0035] Among them, when the fixing nails are installed, they need to be installed in sequence in the direction away from the first medullary nail 100, that is, first install them in the fixing hole 211 closest to the first medullary nail 100, and then install them in sequence until the last fixing nail is installed in the fixing hole 211 farthest from the first medullary nail 100. The installation of each fixing nail will enable an adjustment hole 311 to complete a section of the movement path of the control rod 310, realizing a section of displacement of the control rod 310 along the axial direction of the extension cavity 110, so that the control rod 310 can be moved multiple times, and it is more reliable to use.

[0036] Reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, in some specific embodiments of the present invention, one end of the control member 320 is rotatably connected to one end of the control rod 310, the middle part of the control member 320 is rotatably connected to the extension rod 220, and the other end of the control member 320 can extend outside the extension rod 220 and abut against the extension cavity 110.

[0037] In this embodiment, through the rotational connection between the control rod 310 and the control member 320, the displacement of the control rod 310 can be transmitted to the control member 320, so that the control member 320 also moves, thereby changing the positional relationship between the other end of the control member 320 and the extension cavity 110. When the control assembly 300 is in the second state, the control member 320 can reduce the abutment force between the extension cavity 110, thereby reducing the friction between the control member 320 and the extension cavity 110, so that the first medullary nail 100 and the second medullary nail 200 can smoothly move relative to each other along the axial direction of the extension cavity 110.

[0038] Reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, in some specific embodiments of the present invention, the other end of the control member 320 has a friction layer 321; wherein, the control component 300 is configured as follows: in a first state, the control member 320 squeezes the friction layer 321 to the inner circumference of the extension cavity 110; in a second state, the control member 320 does not squeeze the friction layer 321, or the squeezing force applied by the control member 320 to the friction layer 321 is reduced.

[0039] It is worth understanding that the control member 320 increases the friction between the control member 320 and the extension cavity 110 through the friction layer 321. When the control component 300 is in the first state, the pressure of the control member 320 on the friction layer 321 increases, thereby increasing the friction; when the control component 300 is in the second state, the pressure of the control member 320 on the friction layer 321 decreases, thereby reducing the friction.

[0040] In some specific embodiments of the present invention, the friction layer 321 includes a barb layer along a direction away from the first medullary nail 100. When the first medullary nail 100 and the second medullary nail 200 move along the axial direction of the extension cavity 110, the barb layer will be embedded in the circumferential surface of the extension cavity 110, thereby increasing the friction between the barb layer and the extension cavity 110, so that when the control component 300 is in the first state, the friction between the first medullary nail 100 and the second medullary nail 200 is reliable, and the first medullary nail 100 and the second medullary nail 200 are not easy to move relative to each other.

[0041] Reference Figure 7 As shown, in some specific embodiments of the present invention, the other end of the control member 320 is arranged toward the other end of the control rod 310, and the control component 300 also includes a first elastic member 330 arranged between the control rod 310 and the control member 320; wherein, the control component 300 is configured as follows: in the first state, the first elastic member 330 is in a first compression state; in the second state, the first elastic member 330 is in a second compression state, and the elastic potential energy of the second compression state is greater than the elastic potential energy of the first compression state.

[0042] It is worth understanding that when the femoral fracture reduction device needs to be removed from the patient's body, the fixing nail needs to be removed first. After the fixing nail is removed, the first elastic member 330 will be transformed from the second compression state to the first compression state, and the elastic potential energy of the first elastic member 330 will be released, so that the control rod 310 is automatically reset, and the control member 320 abuts against the inner circumference of the extension cavity 110, thereby realizing the relative fixation of the first medullary nail 100 and the second medullary nail 200.

[0043] Reference Figure 7 As shown, in some specific embodiments of the present invention, one end of the control member 320 is rotatably connected to one end of the control rod 310 through a waist-shaped hole.

[0044] In this embodiment, the control member 320 is rod-shaped, with a circular rotating hole in the middle of the control member 320 and a waist-shaped hole at one end. When the control rod 310 moves axially along the extension cavity 110, the control member 320 rotates around the axis of the rotating hole through the waist-shaped hole, so that the other end of the control member 320 can approach or move away from the inner circumference of the extension cavity 110.

[0045] Reference Figure 3 and Figure 7As shown, in some specific embodiments of the present invention, it also includes: a second elastic member 400, the second elastic member 400 is arranged in the control channel 230, and is arranged between the control member 320 and the extension rod 220 along the axial direction of the extension rod 220; wherein, the second elastic member 400 is configured as follows: in the first state, the second elastic member 400 is in a third compression state; in the second state, the second elastic member 400 is in a fourth compression state, and the elastic potential energy of the fourth compression state is greater than the elastic potential energy of the first compression state.

[0046] It is worth understanding that when the femoral fracture reduction device needs to be removed from the patient's body, the fixing nail needs to be removed first. After the fixing nail is removed, the second elastic member 400 will change from the fourth compression state to the third compression state, and the elastic potential energy of the second elastic member 400 will be released, so that the control rod 310 is automatically reset, and the control member 320 abuts against the inner circumferential surface of the extension cavity 110, thereby realizing the relative fixation of the first medullary nail 100 and the second medullary nail 200.

[0047] Reference Figure 5 As shown, in some specific embodiments of the present invention, the first medullary nail 100 further includes a sealing member 130 disposed within the extension cavity 110 along the circumference of the extension cavity 110 . The sealing member 130 is closer to the outlet of the extension cavity 110 than the control member 320 .

[0048] In this embodiment, the gap between the extension cavity 110 and the extension rod 220 is sealed by the seal 130, thereby reducing the possibility of tissue fluid entering between the extension cavity 110 and the extension rod 220, making the relative movement between the extension cavity 110 and the extension rod 220 more reliable and less susceptible to corrosion or blockage by tissue fluid.

[0049] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A femoral fracture reduction device, characterized in that: include: a first medullary nail having an extension cavity at one end; a second medullary nail comprising a main rod and an extension rod connected to the main rod, the extension rod being inserted into the extension cavity, the main rod having a fixing hole at one end away from the extension rod, the extension rod having a control hole connected to an outer peripheral surface of the extension rod at one end away from the main rod, the second medullary nail further comprising a control channel connecting the fixing hole and the control hole; a control assembly comprising a control rod slidably disposed in the control channel and a control member disposed in the control hole, the control member being transmission-connected to the control rod, an end of the control rod remote from the control member having an adjustment hole, at least a portion of the adjustment hole coinciding with the fixing hole, the control assembly having a first state and a second state; In which, a cross section perpendicular to the axial direction of the fixing hole is defined as a projection plane, and the control component is configured as follows: in the first state, a portion of a first projection of the fixing hole on the projection plane is located outside a second projection of the adjustment hole on the projection plane, and the control member abuts against the extension cavity and fixes the first and second medullary nails; in the second state, the first projection is located within the second projection, the control member does not abut against the extension cavity, or the abutment force of the control member against the extension cavity is reduced, and the first and second medullary nails can move relative to each other along the axial direction of the extension rod.

2. The femoral fracture reduction device according to claim 1, characterized in that: The extension rod is configured to limit rotation along the circumferential direction of the extension cavity.

3. The femoral fracture reduction device according to claim 1, characterized in that: The main rod has a plurality of fixing holes, and the plurality of fixing holes are distributed sequentially in a direction away from the first medullary nail; The control rod has a plurality of adjustment holes, which are sequentially distributed in a direction away from the first medullary nail, and each adjustment hole corresponds to a fixing hole; Wherein, the control component is configured such that, in the first state, the overlapping portion between the first projection and the second projection decreases sequentially along a direction away from the first medullary nail.

4. The femoral fracture reduction device according to claim 1, characterized in that: One end of the control member is rotatably connected to one end of the control rod, the middle portion of the control member is rotatably connected to the extension rod, and the other end of the control member can extend out of the extension rod and abut against the extension cavity.

5. The femoral fracture reduction device according to claim 4, characterized in that: The other end of the control member is provided with a friction layer; Wherein, the control component is configured as follows: in the first state, the control member squeezes the friction layer to the inner circumference of the extension cavity; in the second state, the control member does not squeeze the friction layer, or the squeezing force applied by the control member to the friction layer is reduced.

6. The femoral fracture reduction device according to claim 5, characterized in that: The friction layer includes a barb layer along a direction away from the first medullary nail.

7. The femoral fracture reduction device according to claim 4, characterized in that: The other end of the control member is arranged toward the other end of the control rod, and the control assembly further includes a first elastic member arranged between the control rod and the control member; Wherein, the control component is configured as follows: in the first state, the first elastic member is in a first compressed state; in the second state, the first elastic member is in a second compressed state, and the elastic potential energy of the second compressed state is greater than the elastic potential energy of the first compressed state.

8. The femoral fracture reduction device according to claim 4, characterized in that: One end of the control member is rotatably connected to one end of the control rod through a waist-shaped hole.

9. The femoral fracture reduction device according to claim 1, characterized in that: Also includes: a second elastic member, the second elastic member being disposed in the control channel and disposed between the control member and the extension rod along the axial direction of the extension rod; Wherein, the second elastic member is configured such that: in the first state, the second elastic member is in a third compressed state; In the second state, the second elastic member is in the fourth compressed state, and the elastic potential energy of the fourth compressed state is greater than the elastic potential energy of the first compressed state.

10. The femoral fracture reduction device according to claim 1, characterized in that: The first medullary nail further includes a sealing member disposed within the extension cavity along a circumferential direction of the extension cavity. The sealing member is closer to an outlet of the extension cavity than the control member.

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