Femoral fracture reduction device

Abstract

The application discloses a femur fracture reduction device, which comprises a first intramedullary nail, a second intramedullary nail and a control assembly. The first intramedullary nail has an extension cavity at one end. The second intramedullary nail comprises a main rod and an extension rod connected to the main rod. The extension rod is inserted into the extension cavity. The main rod has a fixing hole at one end away from the extension rod. The extension rod has a control hole communicated with the outer circumferential surface of the extension rod at one end away from the main rod. The second intramedullary nail further comprises a control channel communicated with the fixing hole and the control hole. The control assembly comprises a control rod slidingly arranged in the control channel and a control member arranged in the control hole. The control member is drivingly connected to the control rod. The control rod has an adjusting hole at one end away from the control member. At least part of the adjusting hole is coincident with the fixing hole. The control assembly has a first state and a second state.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a femoral fracture reduction device. Background Technology

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

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

[0004] A femoral fracture reduction device according to an embodiment of the present invention includes:

[0005] The first medullary nail has an extended cavity at one end;

[0006] The second medullary nail includes a main rod and an extension rod connected to the main rod. The extension rod is inserted into the extension cavity. The end of the main rod away from the extension rod has a fixing hole, and the end of the extension rod away from the main rod has a control hole communicating with the outer peripheral surface of the extension rod. The second medullary nail also includes a control channel communicating with the fixing hole and the control hole.

[0007] The control assembly includes a control rod that slides through the control channel and a control member disposed in the control hole. The control member is throttlely connected to the control rod. The end of the control rod away from the control member has an adjustment hole. At least a portion of the adjustment hole coincides with the fixing hole. The control assembly has a first state and a second state.

[0008] Wherein, the cross section perpendicular to the axial direction of the fixing hole is defined as the projection plane, and the control component is configured such that: in the first state, the portion of the first projection of the fixing hole onto the projection plane is located outside the second projection of the adjusting hole onto the projection plane, the control member abuts against the extension cavity, and fixes the first myeloid nail and the second myeloid nail; 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 abutting force of the control member against the extension cavity is reduced, and the first myeloid nail and the second myeloid nail can move relative to each other along the axial direction of the extension rod.

[0009] The femoral fracture reduction device according to embodiments of the present invention has at least the following beneficial effects:

[0010] During orthopedic treatment, the control component is in its first state, where the first and second medullary nails are connected as a single unit. This allows medical personnel to implant both nails into the medullary cavity of the femur. After implantation and alignment of the fracture position, the first and second nails are fixed into the femur using fixation pins to correct and fix the fracture position. When the fixation pin is inserted into the fixation hole of the second nail, the side of the fixation pin pushes the adjustment hole to align with the fixation hole, causing the control rod to move axially along the extension rod. This movement of the control component reduces the force of contact between the control component and the extension cavity, and the control component changes from its first state to its second state. The first and second nails can then move axially along the extension rod, thus meeting the needs of longitudinal femoral growth and minimizing the risk of complications.

[0011] According to some embodiments of the present invention, the extension rod is configured to restrict circumferential rotation along the extension cavity.

[0012] According to some embodiments of the present invention, the main rod has a plurality of fixing holes, and the plurality of fixing holes are distributed sequentially away from the first medullary nail;

[0013] The control rod has a plurality of adjustment holes, which are distributed sequentially along a direction away from the first medullary nail, and each adjustment hole corresponds to a fixing hole.

[0014] The control component is configured such that, in the first state, the overlapping portion of the first projection and the second projection decreases sequentially along a direction away from the first medullary nail.

[0015] 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 out of the extension rod and abut against the extension cavity.

[0016] According to some embodiments of the present invention, the other end of the control element has a friction layer;

[0017] The control component is configured such that, in the first state, the control member presses the friction layer against the inner circumferential surface of the extension cavity, and in the second state, the control member does not press the friction layer, or the pressing force applied by the control member to the friction layer is reduced.

[0018] According to some embodiments of the present invention, the friction layer includes a barb layer along a direction away from the first medullary nail.

[0019] According to some embodiments of the present invention, the other end of the control member is disposed toward the other end of the control lever, and the control assembly further includes a first elastic member disposed between the control lever and the control member;

[0020] The control component is configured such that: in the first state, the first elastic element is in a first compression state; and in the second state, the first elastic element is in a second compression state, wherein the elastic potential energy of the second compression state is greater than the elastic potential energy of the first compression state.

[0021] 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 an oblong hole.

[0022] According to some embodiments of the present invention, it further includes: a second elastic member disposed in the control channel and disposed between the control member and the extension rod along the axial direction of the extension rod;

[0023] The second elastic element is configured such that: in the first state, the second elastic element is in a third compression state; in the second state, the second elastic element is in a fourth compression state, wherein the elastic potential energy of the fourth compression state is greater than the elastic potential energy of the third compression state.

[0024] According to some embodiments of the present invention, the first medullary nail further includes a seal disposed circumferentially within the extension cavity, the seal being closer to the outlet of the extension cavity than the control member.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0027] Figure 1 This is a schematic diagram of the structure of a femoral fracture reduction device according to an embodiment of the present invention;

[0028] Figure 2 This is an exploded structural diagram of a femoral fracture reduction device according to an embodiment of the present invention;

[0029] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0030] Figure 4 This is a schematic cross-sectional view of a femoral fracture reduction device according to an embodiment of the present invention;

[0031] Figure 5for Figure 4 A magnified view of part B in the middle section;

[0032] Figure 6 This is a cross-sectional flowchart illustrating the transition of the control component from a first state to a second state in a femoral fracture reduction device according to an embodiment of the present invention.

[0033] Figure 7 for Figure 6 A magnified view of part C in the middle;

[0034] Figure 8 This is a cross-sectional structural diagram showing the relative positional changes of the fixation hole and the adjustment hole in a femoral fracture reduction device according to an embodiment of the present invention.

[0035] Icon labels:

[0036] First medullary nail 100; extension cavity 110; locking hole 120; sealing element 130;

[0037] Second medullary nail 200; main rod 210; fixing hole 211; extension rod 220; control hole 221; control channel 230;

[0038] Control component 300; control lever 310; adjustment hole 311; control element 320; friction layer 321; first elastic element 330;

[0039] Second elastic element 400. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0042] In the description of this invention, "several" refers to one or more, and "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0043] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0044] Reference Figures 1 to 8 As shown in the figure, an embodiment of the present invention proposes a femoral fracture reduction device, including: a first medullary nail 100, a second medullary nail 200, and a control component 300.

[0045] In this embodiment, one end of the first medullary nail 100 has an extension cavity 110, and the outer peripheral surface of the other end of the first medullary nail 100 has a locking hole 120 for inserting a fixation nail, so that the other end of the first medullary nail 100 is fixed to the femur. The extension cavity 110 has a non-circular cross-section along its axis; its cross-section can be a triangle, a rectangle, or other polygons, or an ellipse, or a combination of a circle and a triangle.

[0046] 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 end of the main rod 210 away from the extension rod 220 has a fixing hole 211, and the end of the extension rod 220 away from the main rod 210 has a control hole 221 communicating with the outer peripheral surface of the extension rod 220. The second medullary nail 200 also includes a control channel 230 communicating 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 peripheral surface of the main rod 210 and the outer peripheral surface of the first medullary nail 100 are in contact with the tissue within the medullary cavity, while the extension rod 220 is inserted into the extension cavity 110, separating it from the tissue within the medullary cavity.

[0047] The control assembly 300 includes a control rod 310 slidably passing through the control channel 230 and a control member 320 disposed in the control hole 221. The control member 320 is throttle-connected to the control rod 310. 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 fixed hole 211. The control assembly 300 has a first state and a second state. A cross-section perpendicular to the axial direction of the fixed hole 211 is defined as the projection plane. The control assembly 300 is configured such that: in the first state... In one state, the portion of the first projection of the fixing hole 211 on the projection plane is outside the second projection of the adjusting hole 311 on the projection plane, and the control member 320 abuts against the extension cavity 110, fixing 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.

[0048] The adjusting hole 311 and the fixing hole 211 are coaxially arranged, 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 the insertion of the fixing pin. The first projection is located outside the second projection. The projections of the axis of the adjusting hole 311 and 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 pin is inserted along the axis of the fixing hole 211, the end of the fixing pin can pass through the adjusting hole 311 without being stopped by the control rod 310. After the end of the fixing pin passes through the adjusting hole 311, the side of the fixing pin will abut against the inner circumferential surface of the adjusting hole 311. During the insertion of the fixing pin, the side of the fixing pin will push the inner circumferential surface of the adjusting hole 311 to move along the axis of the extension rod 220. In other words, the fixing pin pushes the control rod 310 to move along the axis of the extension rod 220, thereby realizing the movement of the control rod 310.

[0049] The movement of the control rod 310 transmits power to the control member 320, causing a change in the state between the control member 320 and the inner circumferential surface of the extension cavity 110. This reduces the tightness of the connection between the control member 320 and the extension cavity 110. In other words, the tightness of the connection between the first medullary nail 100 and the second medullary nail 200 is reduced, allowing the first medullary nail 100 and the second medullary nail 200 to move axially along the extension rod 220, enabling the patient's bones to grow longitudinally and avoiding sequelae.

[0050] It is understandable that during orthopedic treatment, the control component 300 is in its first state, and the first medullary nail 100 and the second medullary nail 200 are connected as a single unit. This allows medical personnel to implant both the first medullary nail 100 and the second medullary nail 200 together into the medullary cavity of the femur. After implantation and alignment of the fracture position, the first medullary nail 100 and the second medullary nail 200 are then nailed into the femur using fixation screws to correct and fix the fracture position. When the fixation screw is inserted into the fixation hole 211 of the second medullary nail 200, the fixation screw... The side will push the adjustment hole 311 to align with the fixing hole 211, and cause the control rod 310 to move along the axial direction of the extension rod 220, and move the control component 320 in conjunction, so that the control component 320 does not abut against the extension cavity 110 or the force of abutting against the extension cavity 110 is reduced. The control component 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 longitudinal femoral growth and making it less likely to cause sequelae.

[0051] In addition, medical staff can insert fixation pins into fixation holes 211 before surgery so that the first medullary nail 100 and the second medullary nail 200 can move relative to each other along the axis of extension rod 220, thereby adjusting 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 compatible with the length of the patient's femur, and improve the applicability of the femoral fracture reduction device.

[0052] In addition, when the femoral fracture reduction device needs to be removed from the patient's body, the control rod 310 automatically resets after the fixation nail is removed, so that the control component 300 changes from the second state to the first state, thereby fixing the first medullary nail 100 and the second medullary nail 200 relatively, making it easier for medical staff to remove the first medullary nail 100 and the second medullary nail 200 together.

[0053] Reference Figure 1 and Figure 2 As shown, in some specific embodiments of the present invention, the extension rod 220 is configured to restrict circumferential rotation along the extension cavity 110.

[0054] In this embodiment, the extension rod 220 has a rectangular cross-sectional shape along its axial direction, and the extension cavity 110 has a rectangular cross-sectional shape along its axial direction. After the extension rod 220 is inserted into the extension cavity 110, it is difficult for it to rotate circumferentially along the extension cavity 110, so that the extension rod 220 mainly moves along the axial direction of the extension cavity 110. This allows the first medullary nail 100 and the second medullary nail 200 to extend mainly along the axial direction of the extension cavity 110, adapting to the longitudinal growth of the patient's bones and making it more conducive to the patient's rehabilitation.

[0055] Reference Figure 8 As shown, in some specific embodiments of the present invention, the main rod 210 has a plurality of fixing holes 211, which are distributed sequentially in a direction away from the first medullary nail 100; the control rod 310 has a plurality of adjustment holes 311, which are distributed sequentially 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 a first state, the overlapping portion of the first projection and the second projection decreases sequentially in a direction away from the first medullary nail 100.

[0056] In this embodiment, the movement path of the control rod 310 along the axial direction of the extension cavity 110 is divided into multiple segments, and is adjusted through the adjustment holes 311 in multiple fixing holes 211. Each adjustment hole 311 corresponds to a segment of the movement path of the control rod 310. When all fixing holes 211 have fixing pins, each adjustment hole 311 drives the control rod 310 to move a segment of the movement path. All adjustment holes 311 enable the control rod 310 to move all the movement paths.

[0057] When installing the fixing pins, they need to be installed sequentially in the direction away from the first medullary nail 100. That is, first install the fixing pin in the fixing hole 211 closest to the first medullary nail 100, and then install them sequentially until the last fixing pin is installed in the fixing hole 211 farthest from the first medullary nail 100. The installation of each fixing pin will cause 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 move multiple times and is more reliable in use.

[0058] 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 out of the extension rod 220 and abut against the extension cavity 110.

[0059] In this embodiment, the rotational connection between the control rod 310 and the control member 320 allows the displacement of the control rod 310 to be transmitted to the control member 320, causing the control member 320 to move as well. This changes the positional relationship between the other end of the control member 320 and the extension cavity 110. When the control component 300 is in the second state, the control member 320 can reduce the contact force with the extension cavity 110, thereby reducing the friction between the control member 320 and the extension cavity 110, allowing the first medullary nail 100 and the second medullary nail 200 to move smoothly relative to each other along the axial direction of the extension cavity 110.

[0060] 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 such that: in a first state, the control member 320 presses the friction layer 321 to the inner peripheral surface of the extension cavity 110, and in a second state, the control member 320 does not press the friction layer 321, or the pressing force applied by the control member 320 to the friction layer 321 is reduced.

[0061] It is understandable that the control element 320 increases the friction between the control element 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 element 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 element 320 on the friction layer 321 decreases, thereby reducing the friction.

[0062] In some specific embodiments of the present invention, the friction layer 321 includes a barb layer along the 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 frictional force between the barb layer and the extension cavity 110. This makes the frictional force between the first medullary nail 100 and the second medullary nail 200 reliable when the control component 300 is in the first state, and the first medullary nail 100 and the second medullary nail 200 are not easily moved relative to each other.

[0063] Reference Figure 7 As shown, in some specific embodiments of the present invention, the other end of the control member 320 is disposed facing the other end of the control lever 310, and the control assembly 300 further includes a first elastic member 330 disposed between the control lever 310 and the control member 320; wherein, the control assembly 300 is configured such that: in a first state, the first elastic member is in a first compression state; in a 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.

[0064] It is understandable that when the femoral fracture reduction device needs to be removed from the patient's body, the fixation nails need to be removed first. After the fixation nails are removed, the first elastic element 330 will change from the second compression state to the first compression state, and the elastic potential energy of the first elastic element 330 will be released, so that the control rod 310 will automatically reset, and the control element 320 will abut against the inner circumferential surface of the extension cavity 110, thereby achieving relative fixation of the first medullary nail 100 and the second medullary nail 200.

[0065] 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 an oblong hole.

[0066] In this embodiment, the control member 320 is rod-shaped, with a circular rotating hole in the middle and an oblong hole at one end. When the control rod 310 moves along the axial direction of the extension cavity 110, the control member 320 rotates around the axis of the rotating hole through the oblong hole, so that the other end of the control member 320 can approach or move away from the inner circumferential surface of the extension cavity 110.

[0067] Reference Figure 3 and Figure 7As shown, in some specific embodiments of the present invention, it further includes: a second elastic member 400, which is disposed in the control channel 230 and is disposed 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 such that: in a first state, the second elastic member 400 is in a third compression state; in a 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 third compression state.

[0068] It is understandable that when the femoral fracture reduction device needs to be removed from the patient's body, the fixation nails need to be removed first. After the fixation nails are removed, the second elastic element 400 will change from the fourth compression state to the third compression state, and the elastic potential energy of the second elastic element 400 will be released, so that the control rod 310 will automatically reset, and the control element 320 will abut against the inner circumferential surface of the extension cavity 110, thereby achieving relative fixation of the first medullary nail 100 and the second medullary nail 200.

[0069] 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 circumferentially within the extension cavity 110, the sealing member 130 being closer to the outlet of the extension cavity 110 than the control member 320.

[0070] In this embodiment, the gap between the extension cavity 110 and the extension rod 220 is sealed by the sealant 130, which reduces the possibility of tissue fluid entering 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.

[0071] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A femoral fracture reduction device, characterized in that, include: The first medullary nail has an extended cavity at one end; The second medullary nail includes a main rod and an extension rod connected to the main rod. The extension rod is inserted into the extension cavity. The end of the main rod away from the extension rod has a fixing hole, and the end of the extension rod away from the main rod has a control hole communicating with the outer peripheral surface of the extension rod. The second medullary nail also includes a control channel communicating with the fixing hole and the control hole. The control assembly includes a control rod that slides through the control channel and a control member disposed in the control hole. The control member is throttlely connected to the control rod. The end of the control rod away from the control member has an adjustment hole. At least a portion of the adjustment hole coincides with the fixing hole. The control assembly has a first state and a second state. Wherein, the cross section perpendicular to the axial direction of the fixing hole is defined as the projection plane, and the control component is configured such that: in the first state, the portion of the first projection of the fixing hole onto the projection plane is located outside the second projection of the adjusting hole onto the projection plane, the control member abuts against the extension cavity, and fixes the first myeloid nail and the second myeloid nail; 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 abutting force of the control member against the extension cavity is reduced, and the first myeloid nail and the second myeloid nail 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 restrict circumferential rotation along 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, which are distributed sequentially away from the first medullary nail; The control rod has a plurality of adjustment holes, which are distributed sequentially along a direction away from the first medullary nail, and each adjustment hole corresponds to a fixing hole. The control component is configured such that, in the first state, the overlapping portion of 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 element is rotatably connected to one end of the control rod, the middle part of the control element is rotatably connected to the extension rod, and the other end of the control element 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 component has a friction layer; The control component is configured such that, in the first state, the control member presses the friction layer against the inner circumferential surface of the extension cavity, and in the second state, the control member does not press the friction layer, or the pressing 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 element is disposed facing the other end of the control lever, and the control assembly further includes a first elastic element disposed between the control lever and the control element; The control component is configured such that: in the first state, the first elastic element is in a first compression state; and in the second state, the first elastic element is in a second compression state, wherein the elastic potential energy of the second compression state is greater than the elastic potential energy of the first compression state.

8. The femoral fracture reduction device according to claim 4, characterized in that: One end of the control element is rotatably connected to one end of the control rod through an oblong hole.

9. The femoral fracture reduction device according to claim 1, characterized in that, Also includes: The second elastic element is disposed in the control channel and is located between the control element and the extension rod along the axial direction of the extension rod. The second elastic element is configured such that, in the first state, the second elastic element is in a third compressed state; In the second state, the second elastic element 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 third compression state.

10. The femoral fracture reduction device according to claim 1, characterized in that: The first medullary nail also includes a seal disposed circumferentially within the extension cavity, the seal being closer to the outlet of the extension cavity than the control element.

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