Femoral fracture intramedullary fixing device

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By designing a femoral fracture intramedullary fixation device including main support tube, sliding sleeve, support rod and reinforcement rod, the problems of fixation instability and insufficient support in the prior art are solved, and the uniformity of hip stress and The improved device stability is suitable for a variety of fracture types, reducing the risk of hip injury and device deformation.

CN222341282UActive Publication Date: 2025-01-14FIRST HOSPITAL AFFILIATED TO GENERAL HOSPITAL OF PLA

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Patent Information

Application Number: CN202420810176.2
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-04-18
Publication Date: 2025-01-14
Estimated Expiration: 2034-04-18

AI Technical Summary

Technical Problem

The existing femoral fracture intramedullary fixation devices have problems such as instability in fixation, insufficient support force, and concentration of stress at a single support point, resulting in hip injury and device deformation.

Method used

A femoral fracture internal fixation device including the main support tube, sliding sleeve, supporting rod and reinforcement rod is designed. Through the cooperation of the sliding sleeve and push rod, the support rod and reinforcement rod can extend or retract and disperse the femoral head. Pressure increases the uniformity of the hip joint and improves the stability of the device through limiting grooves and fasteners.

Benefits of technology

Effectively avoid stress concentration at a single support point, improve the uniformity of the hip joint, reduce the risk of hip joint injury and device deformation, is suitable for a variety of fracture types, is easy to operate, reduces the workload of medical staff, and saves The cost.

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Abstract

The utility model belongs to the technical field of fracture intramedullary fixing devices, and discloses a femoral fracture intramedullary fixing device which comprises a main supporting tube, a sliding sleeve is connected to the main supporting tube in a sliding mode, a plurality of supporting rods are rotatably connected to the sliding sleeve in the circumferential direction of the sliding sleeve, reinforcing rods are rotatably connected to the supporting rods, and the free ends of the reinforcing rods are rotatably connected with one end of the main supporting tube. A push rod used for pushing the sliding sleeve to slide is slidably connected into the main supporting pipe, a limiting groove extending in the axial direction of the main supporting pipe is formed in the side wall of the main supporting pipe, and a push block is slidably connected into the limiting groove and connected with the push rod. The end, away from the reinforcing rod, of the main supporting pipe is further provided with a fastener used for pushing or limiting sliding of the push rod. The femoral fracture intramedullary fixing device solves the problems that an existing femoral fracture intramedullary fixing device is unstable in fixation and insufficient in supporting force, and stress of a single supporting point is concentrated.

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Description

Technical Field

[0001] The utility model relates to the technical field of intramedullary fixation devices for fractures, in particular to an intramedullary fixation device for femoral fractures. Background Art

[0002] At present, the femur is usually divided into two ends. The proximal end has a round femoral head that points inward and forward and forms a hip joint with the acetabulum. The narrow part below the femoral head is the femoral neck. One end of the femoral body is approximately cylindrical and slightly bent forward. Femoral fractures are more likely to occur in the round femoral head at the proximal end and less common at the distal end. Adults may suffer from hip dislocation and the elderly are more likely to suffer from femoral head fractures. After a femur fracture occurs in the human body, an intramedullary nail is usually used to connect the broken bones. After a wound is opened at one end of the bone and the intramedullary nail is implanted, a lag screw and a fixation nail are installed at the proximal and distal ends of the intramedullary nail respectively. The lag screw is screwed into the separated fracture fragments, and the fixation nail can prevent the bone from rotating and shortening.

[0003] However, implantation of a single intramedullary nail into the bone marrow may result in unstable fixation, insufficient support, and increased stress concentration in the round femoral head due to a single support point, which may lead to hip joint injury and deformation of the device. Utility Model Content

[0004] The utility model aims to provide an intramedullary fixation device for femoral fractures, so as to solve the problems of unstable fixation, insufficient supporting force and stress concentration at a single supporting point of the existing intramedullary fixation device for femoral fractures.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The basic technical solution provided by the utility model is:

[0007] A femoral fracture intramedullary fixation device comprises a main support tube, a sliding sleeve is slidably connected to the main support tube, the sliding sleeve is rotatably connected to a plurality of support rods along its circumferential direction, the support rod is rotatably connected to a reinforcing rod, the free end of the reinforcing rod is rotatably connected to one end of the main support tube; a push rod for pushing the sliding sleeve to slide is slidably connected inside the main support tube, and a limiting groove extending along its axial direction is provided on the side wall of the main support tube, a push block is slidably connected inside the limiting groove, and the push block is connected to the push rod; a fastener for pushing or limiting the sliding of the push rod is also provided at one end of the main support tube away from the reinforcing rod.

[0008] Principles of basic technical solutions:

[0009] The sliding sleeve is arranged on the main support tube and is slidably connected with the main support tube. The sliding sleeve is connected to a plurality of support rods in a rotatable manner along the circumferential direction. One end of the support rod away from the sliding sleeve is rotatably connected to the reinforcing rod, and the free end of the reinforcing rod is rotatably connected to one end of the main support tube. The sliding sleeve slides up and down along the circumferential direction of the main support tube, thereby driving the connection between the reinforcing rod and the support rod to extend or retract in the axial direction away from the main support tube; a push rod is slidably connected in the main support tube, and a limiting groove extending in the length direction of the main support tube is provided on the side wall of the main support tube, a push block is slidably connected in the limiting groove, and the push block is connected to the push rod. By pushing or pulling the push rod, the push rod can drive the guide sleeve to slide up and down along the length direction of the main support tube, thereby driving the connection between the reinforcing rod and the support rod to extend or retract in the axial direction away from the main support tube; the sliding sleeve slides to a suitable position, and the position of the push rod is fixed by a fastener, thereby limiting the sliding sleeve from continuing to slide up and down.

[0010] The beneficial effects of the basic technical solution are:

[0011] By setting a sliding sleeve, a plurality of support rods and a plurality of reinforcing rods, a plurality of support rods and reinforcing rods support various parts of the femoral head, and a plurality of support rods have a supporting effect on the femoral head, and a plurality of support rods disperse the pressure of the femoral head. On the one hand, the problem of stress concentration caused by a single support point is avoided, so that the force distribution of the hip joint is more uniform, and the excessive pressure on a single point is reduced, thereby reducing the risk of hip joint injury and deformation of the instrument; on the other hand, the fixing device can push the push rod to a suitable position according to the fracture type and severity of the patient, and is suitable for a variety of different types of hip fractures. By setting a push rod, a push block and a limiting groove, only need to push or pull the push rod outside the bone marrow to drive the connection between the reinforcing rod and the support rod to extend or retract in the direction away from the axis of the main support tube, which is convenient to operate and reduces the workload of medical staff; and the structure is simple, the manufacturing is convenient, and the cost can be saved. The setting of the limiting groove, on the one hand, can provide a sliding channel for the push block, so that the push block can transfer the thrust of the push rod to the sliding sleeve, the structure is simple, and the operation is convenient; on the other hand, it can also limit the rotation of the push rod in the main support tube, further increasing the support stability of the device.

[0012] Preferably, the fastener is an adjusting bolt threadedly connected to the inner wall of the main support tube; and the adjusting bolt is rotatably connected to an end of the push rod away from the reinforcing rod.

[0013] Through the above-mentioned arrangement, one end of the adjusting bolt is inserted into the main support tube from the pipe opening of the main support tube away from the reinforcing rod, and is connected by a thread. The adjusting bolt is rotatably connected to the push rod. Rotating the adjusting bolt clockwise or counterclockwise can push the push rod to slide up or down, and the sliding sleeve can be fixed at different positions. The connection between the reinforcing rod and the support rod extends different distances in the direction away from the axis of the main support tube, so that it is suitable for many different types of hip fractures, and is easy to operate, which can reduce the workload of medical staff. Adjust the push rod to a suitable position, stop rotating the adjusting bolt, and the threaded connection between the adjusting bolt and the main support tube can limit the push rod from sliding up and down, further increasing the stability of the fixation of the device.

[0014] Preferably, a groove is provided on one end of the push rod connected to the adjusting bolt, a bearing is fixedly connected in the groove, and the adjusting bolt is rotatably connected to one end of the push rod away from the reinforcing rod via the bearing.

[0015] Through the above arrangement, the adjusting bolt and the push rod are rotatably connected via the bearing, which can reduce the rotational resistance, facilitate the operation, and further reduce the workload of the staff.

[0016] Preferably, the cross-section of one end of the support rod away from the sliding sleeve is arc-shaped.

[0017] Through the above setting, the cross-sectional shape of the end of the support rod away from the sliding sleeve is set to an arc shape. The arc surface can increase the contact area between the support rod and the femoral head, increase the supporting force, and avoid stress concentration caused by the sharp part, thereby further reducing the risk of hip joint injury and deformation of the instrument.

[0018] Preferably, the end of the support rod away from the sliding sleeve is connected to a connecting block, and the end of the reinforcing rod away from the main support tube is connected to the connecting block via a rotating shaft pin.

[0019] Through the above-mentioned arrangement, the connecting blocks of the reinforcing rod and the support rod are connected by the pivot pin, which can avoid the reinforcing rod being directly connected to the support rod, thereby preventing the pivot pin from damaging the femoral head when the reinforcing rod and the support rod rotate; and the end of the reinforcing rod is connected to the end of the support rod, which can increase the supporting strength of the connection and further reduce the risk of deformation of the support rod.

[0020] Preferably, the number of the support rods is 8, and the support rods are evenly spaced and distributed along the circumferential direction of the main support tube.

[0021] Through the above-mentioned configuration, multiple support rods are provided to disperse the pressure on the bones, avoiding the problem of stress concentration caused by a single support point, making the force distribution of the hip joint more uniform, reducing excessive pressure on a single point, and further reducing the risk of hip joint injury and deformation of the device; the support rods are evenly spaced along the circumferential direction of the main support tube, which can disperse the pressure more evenly and avoid excessive local pressure.

[0022] Preferably, an end cap is detachably connected to the end of the main support tube close to the reinforcing rod.

[0023] Through the above arrangement, the end cover is arranged to prevent the tissue in the bone from falling into the main support tube and hindering the smooth sliding of the push rod, thereby further reducing the workload of medical staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a femoral fracture intramedullary fixation device connected to a femoral head according to the utility model;

[0025] Figure 2 This is a schematic structural diagram of a femoral fracture intramedullary fixation device according to the utility model;

[0026] Figure 3 It is a top view of a femoral fracture intramedullary fixation device of the utility model;

[0027] Figure 4 This is a schematic structural diagram of a main support tube of a femoral fracture intramedullary fixation device according to the utility model;

[0028] Figure 5 It is a structural schematic diagram of the connection between a push rod, a sliding sleeve and a push block of a femoral fracture intramedullary fixation device of the utility model;

[0029] Figure 6 It is a cross-sectional view of the connection between the main support tube, push rod, sliding sleeve, push block and adjusting bolt of a femoral fracture intramedullary fixation device of the utility model;

[0030] Figure 7 For this utility model Figure 6 Enlarged schematic diagram at point A in the middle.

[0031] The names of the corresponding marks in the accompanying drawings are:

[0032] Push rod 1, groove 11, bearing 12, main support tube 2, adjusting bolt 21, limiting groove 22, push block 3, sliding sleeve 4, support rod 51, reinforcing rod 52, connecting block 521, end cover 6, tensioning bolt 7. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0034] like Figures 1 to 7 As shown, a femoral fracture intramedullary fixation device comprises a main support tube 2, on which a sliding sleeve 4 is slidably connected, and on which the sliding sleeve 4 are rotatably connected eight support rods 51 along the circumferential direction of the sliding sleeve 4, and the support rods 51 are evenly spaced along the circumferential direction of the main support tube 2; wherein the cross-sectional shape of the end of the support rod 51 away from the sliding sleeve 4 is an arc; the end of the support rod 51 away from the sliding sleeve 4 is rotatably connected to a reinforcing rod 52, and the free end of the reinforcing rod 52 is rotatably connected to one end of the main support tube 2; wherein the end of the support rod 51 away from the sliding sleeve 4 is connected to a connecting block 521, and the end of the reinforcing rod 52 away from the main support tube 2 is connected to the connecting block 521 via a rotating shaft pin; the end of the main support tube 2 close to the reinforcing rod 52 is detachably connected to an end cover 6, and the support tube and the end cover 6 Interference fit; a push rod 1 for pushing the sliding sleeve 4 to slide is slidably connected inside the main support tube 2, and a limiting groove 22 extending along the axial direction of the main support tube 2 is opened on the side wall of the main support tube 2, and a push block 3 is slidably connected inside the limiting groove 22, and the push block 3 is connected to the push rod 1; a fastener for pushing or limiting the sliding of the push rod 1 is also provided at one end of the main support tube 2 away from the reinforcing rod 52. In the present embodiment, the fastener is an adjusting bolt 21 threadedly connected to the inner wall of the main support tube 2, and the adjusting bolt 21 is rotatably connected to the end of the push rod 1 away from the reinforcing rod 52; a groove 11 is provided on the end of the push rod 1 connected to the adjusting bolt 21, and a bearing 12 is fixedly connected in the groove 11, and the adjusting bolt 21 is rotatably connected to the end of the push rod 1 away from the reinforcing rod 52 through the bearing 12.

[0035] The specific implementation process is as follows:

[0036] The device is implanted into the intramedullary cavity of the femoral head and fixed by the tightening bolt 7; the adjusting bolt 21 is rotated clockwise, and the adjusting bolt 21 pushes the push rod 1 to slide in the direction close to the reinforcing rod 52, and the push rod 1 drives the push block 3 to slide along the limiting groove 22 in the direction close to the reinforcing rod 52, thereby driving the sliding sleeve 4 to slide in the direction close to the reinforcing rod 52 until the support rod 51 and the reinforcing rod 52 are extended to a suitable distance to support the femoral head; the rotation of the adjusting bolt 21 is stopped, and the adjusting bolt 21 is threadedly connected to the main support tube 2 to fix the push rod 1, thereby limiting the rotation of the support rod 51 and the reinforcing rod 52.

[0037] Among them, by setting the sliding sleeve 4, a plurality of support rods 51 and a plurality of reinforcing rods 52, a plurality of support rods 51 and reinforcing rods 52 support various places of the femoral head, and a plurality of support rods 51 have a supporting effect on the femoral head, and a plurality of support rods 51 disperse the pressure of the femoral head. On the one hand, the problem of stress concentration caused by a single support point is avoided, so that the force distribution of the hip joint is more uniform, and the excessive pressure on a single point is reduced, thereby reducing the risk of hip joint injury and deformation of the instrument; on the other hand, the fixing device can push the push rod 1 to a suitable position according to the fracture type and severity of the patient, and is suitable for a variety of different types of hip fractures. By setting the push rod 1, the push block 3 and the limit groove 22, only need to push or pull the push rod 1 outside the bone marrow to drive the connection between the reinforcing rod 52 and the support rod 51 to extend or retract in the direction away from the axis of the main support tube 2, which is easy to operate and reduces the workload of medical staff; and the structure is simple, easy to manufacture, and can save costs. The setting of the limit groove 22, on the one hand, can provide a sliding channel for the push block 3, so that the push block 3 can transfer the thrust of the push rod 1 to the sliding sleeve 4, which has a simple structure and is easy to operate; on the other hand, it can also limit the rotation of the push rod 1 in the main support tube 2, further increasing the support stability of the device.

[0038] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical scheme or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the technical scheme of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A femoral fracture intramedullary fixation device, characterized in that: The invention comprises a main support tube (2), a sliding sleeve (4) being slidably connected to the main support tube (2), a plurality of support rods (51) being rotatably connected to the sliding sleeve (4) along its circumferential direction, the support rod (51) being rotatably connected to a reinforcing rod (52), the free end of the reinforcing rod (52) being rotatably connected to one end of the main support tube (2); a push rod (1) being slidably connected inside the main support tube (2) for pushing the sliding sleeve (4) to slide, and a limiting groove (22) extending along its axial direction is provided on the side wall of the main support tube (2), a push block (3) being slidably connected inside the limiting groove (22), and the push block (3) being connected to the push rod (1); a fastener for pushing or limiting the sliding of the push rod (1) is also connected to one end of the main support tube (2) away from the reinforcing rod (52).

2. The intramedullary fixation device for femoral fracture according to claim 1, characterized in that: The fastener is an adjusting bolt (21) threadedly connected to the inner wall of the main support tube (2); and the adjusting bolt (21) is rotatably connected to an end of the push rod (1) away from the reinforcing rod (52).

3. The intramedullary fixation device for femoral fracture according to claim 2, characterized in that: A groove (11) is provided at one end of the push rod (1) connected to the adjusting bolt (21), a bearing (12) is fixedly connected in the groove (11), and the adjusting bolt (21) is rotatably connected to an end of the push rod (1) away from the reinforcing rod (52) via the bearing (12).

4. The intramedullary fixation device for femoral fracture according to claim 1, characterized in that: The cross-sectional shape of one end of the support rod (51) away from the sliding sleeve (4) is arc-shaped.

5. The intramedullary fixation device for femoral fracture according to claim 1, characterized in that: The end of the support rod (51) away from the sliding sleeve (4) is connected to a connecting block (521), and the end of the reinforcing rod (52) away from the main support tube (2) is connected to the connecting block (521) via a rotating shaft pin.

6. The intramedullary fixation device for femoral fracture according to claim 1, characterized in that: The number of the support rods (51) is 8, and the support rods (51) are evenly spaced and distributed along the circumferential direction of the main support tube (2).

7. The intramedullary fixation device for femoral fracture according to claim 1, characterized in that: An end cap (6) is detachably connected to the end of the main support tube (2) close to the reinforcing rod (52).