Femoral intramedullary nail

Abstract

The utility model discloses a femoral intramedullary nail which comprises a main nail, the main nail comprises a far-end section, a near-end section and a connecting piece used for connecting the far-end section and the near-end section, the connecting piece comprises a first section and a second section, the first section is in threaded connection with the far-end section, and the second section is in threaded connection with the near-end section. Through relative rotation of the near-end section and the far-end section, the upper part and the lower part, needing to be corrected, of the near end of the femur are adjusted to reach a proper matching angle, the structure is simple, rotation correction bone setting treatment is specially carried out on the near end of a child, controlled rotation correction is allowed, and the device is mainly designed for near-end fracture, malformation healing, bone nonunion and malformation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a femoral intramedullary nail. Background Technology

[0002] Intramedullary nails are orthopedic internal fixation devices in the medical device field, and their structure includes an intramedullary nail rod. Intramedullary nails are the preferred internal fixation for femoral shaft fractures. The insertion point of the femoral intramedullary nail is located in the piriform fossa on the medial side of the greater trochanter of the femur. During the intramedullary nailing process, the fractured part is prone to rotation, causing postoperative rotational deformity. In this case, a second surgery is required to remove the proximal and distal fixation screws and refix, which is time-consuming, laborious, and increases the pain for the patient. Utility Model Content

[0003] The purpose of this application is to provide a femoral intramedullary nail to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] An intramedullary nail for the femoral bone marrow includes: a main nail, the main nail including a distal segment, a proximal segment, and a connector for connecting the distal segment and the proximal segment, the connector including a first segment and a second segment, the first segment being threadedly connected to the distal segment, and the second segment being threadedly connected to the proximal segment.

[0006] Optionally, the proximal end face of the distal segment and the distal end face of the proximal segment are respectively provided with a first tooth groove and a second tooth groove that are evenly distributed in the circumferential direction, and the first tooth groove and the second tooth groove mesh with each other.

[0007] Optionally, the central angle of a single first tooth groove and the central angle of a single second tooth groove are equal and the angle range is 5°-10°.

[0008] Optionally, the proximal end of the distal segment and the distal end of the proximal segment are respectively provided with an axial first threaded hole and a second threaded hole, and the first segment and the second segment of the connector are respectively threadedly connected to the first threaded hole and the second threaded hole.

[0009] Optionally, the first threaded hole and the second threaded hole have the same pitch.

[0010] Optionally, the first threaded hole and / or the second threaded hole are stepped holes.

[0011] Optionally, the diameters at the junction of the proximal end of the first threaded hole and the distal end of the second threaded hole are the same.

[0012] Optionally, the proximal end face of the proximal segment is square.

[0013] Optionally, the outer wall of the proximal segment is provided with a groove for engaging the locking pin.

[0014] Optionally, the distal end of the distal segment has a tapered tip.

[0015] In summary, the technical effects and advantages of this utility model are as follows: This application adjusts the upper and lower parts of the proximal femur that need to be corrected to a suitable matching angle by rotating the proximal and distal ends of the intramedullary nail relative to each other. It has a simple structure and is specially designed for rotational correction of proximal femoral bone in children. It allows controlled rotational correction and is mainly designed for proximal fractures, malunion, nonunion and deformities. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the femoral intramedullary nail structure in one embodiment of the present invention;

[0018] Figure 2 This is a diagram showing the use of the femoral intramedullary nail in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the connector structure in one embodiment of the present invention. Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the connector structure in one embodiment of the present invention. Figure 2 ;

[0021] Figure 5 This is a schematic diagram of the connector structure in one embodiment of the present invention. Figure 3 ;

[0022] Figure 6 This is a schematic diagram of the structure of the first tooth groove in one embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of the second tooth groove in one embodiment of the present invention.

[0024] in:

[0025] 1. Proximal section; 11. Second threaded hole; 12. Second tooth groove; 2. Locking pin; 3. Groove; 4. Distal section; 41. First threaded hole; 42. First tooth groove; 5. Connector. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the system or component 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] This embodiment provides a femoral intramedullary nail, such as Figures 1-7 As shown, the femoral intramedullary nail includes a main nail, which includes a proximal segment 1, a distal segment 4, and a connector 5 for connecting the distal segment 4 and the proximal segment 1. The connector 5 includes a first segment and a second segment, the first segment being threadedly connected to the distal segment 4 and the second segment being threadedly connected to the proximal segment 1.

[0031] In this embodiment, the femoral intramedullary nail is used for dysplastic proximal femur. It requires osteotomy of the femur to be corrected, cutting the proximal femur vertically. The proximal segment 1 is implanted into the upper part of the osteotomy, and the distal segment 4 is implanted into the lower part of the osteotomy. By rotating the proximal segment 1 and the distal segment 4 relative to each other, the upper and lower parts of the proximal femur to be corrected are adjusted to achieve a suitable fitting angle. The proximal segment 1 and the distal segment 4 are fixed by the connector 5 to the femoral intramedullary nail, which enables the implantation of the intramedullary nail.

[0032] Optionally, the proximal end face of the distal segment 4 and the distal end face of the proximal segment 1 are respectively provided with a first tooth groove 42 and a second tooth groove 12 that are evenly distributed in the circumference, and the first tooth groove 42 and the second tooth groove 12 mesh with each other. The arrangement of the first tooth groove 42 and the second tooth groove 12 in this embodiment can increase the connection strength between the proximal segment 1 and the distal segment 4 and increase the anti-rotation property.

[0033] Optionally, the central angle of a single first tooth groove 42 and the central angle of a single second tooth groove 12 are equal and the angle range is 5°-10°. The rotation angle can be determined by calculating the number of tooth grooves during rotation.

[0034] Optionally, the proximal end of the distal segment 4 and the distal end of the proximal segment 1 are respectively provided with an axial first threaded hole 41 and a second threaded hole 11, and the first segment and the second segment of the connector 5 are respectively threadedly connected to the first threaded hole 41 and the second threaded hole 11. In this embodiment, the connector 5 can be configured as an internal hexagonal drive, and the proximal segment 1 and the distal segment 4 are fixed by the connector 5 during rotation.

[0035] Optionally, the pitch of the first threaded hole 41 and the second threaded hole 11 is the same.

[0036] Optionally, the first threaded hole 41 and / or the second threaded hole 11 are stepped holes. Correspondingly, the first segment and / or the second segment are also stepped, thereby further increasing the connection stability between the connector 5 and the main pin.

[0037] Optionally, the diameter of the proximal end of the first threaded hole 41 and the distal end of the second threaded hole 11 are the same, so that the diameter of the joint between the proximal segment 1 and the distal segment 4 is the same. This ensures that the force on the connector 5 at this point is basically the same for the proximal segment 1 and the distal segment 4, thus ensuring a stable connection and preventing uneven force on the connector 5 at this point, which could lead to stress concentration and breakage.

[0038] Optionally, the proximal end face of the proximal segment 1 is square. The square design of the proximal end face of the proximal segment 1 facilitates the entry of the femoral intramedullary nail into the femoral medullary cavity and can increase the rotational stability of the proximal femur.

[0039] Optionally, the outer wall of the proximal segment 1 is provided with a groove 3 for engaging the locking pin 2. The locking pin 2 is at least partially inserted into the groove 3, and engaging with the groove 3 increases the stability of the proximal femoral intramedullary nail.

[0040] Optionally, the distal end of the distal segment 4 has a tapered tip. Optionally, the proximal end of the distal segment 4 is configured as a slope that gradually slopes inward from the proximal end to the distal end. In this embodiment, the sloped configuration of the distal segment 4 facilitates its entry into the femoral medullary cavity.

[0041] The working process of this embodiment is as follows: First, osteotomy correction of the proximal femur is required. Then, the femoral intramedullary nail is implanted into the femur through the lateral side of the perforated femoral trochanter. The distal segment 4 is first fixed by the locking pin 2. Then, the locking pin 2 at the groove 3 temporarily stabilizes the groove 3 of the proximal segment 1. Then, the connector 5 is loosened so that the connector 5 is disengaged from the first threaded hole 41 of the distal segment 4 and connected to the second threaded hole 11 of the proximal segment 1. The osteotomy and the proximal segment 1 of the main nail are rotated together. After correction, the connector 5 is locked to the proximal segment 1 and the distal segment 4.

[0042] By connecting the proximal segment 1 and distal segment 4 of the intramedullary nail via connector 5, relative rotation of the proximal segment 1 and distal segment 4 can be performed during implantation to adjust the proximal femoral angle. The angle of relative rotation between the proximal segment 1 and distal segment 4 can be determined by the first alveolar notch 42 and the second alveolar notch 12. In this application, the intramedullary nail is used for femoral neck osteotomy. After the intramedullary nail is connected, it is implanted into the femur to fix the distal segment 4. The groove 3 of the proximal segment 1 is temporarily fixed by locking screw 2. Loosening connector 5 allows for rotational correction (micro-motion) of the femoral head and proximal segment 1. After correction, connector 5 is tightened. This allows for correction of angle changes that may occur during intramedullary nail implantation during surgery, avoiding the need for further surgical correction and reducing patient discomfort.

[0043] In summary, this embodiment adjusts the upper and lower parts of the proximal femur that need to be corrected to a suitable angle by rotating the proximal and distal segments relative to each other. It has a simple structure and is designed for rotational correction of proximal femoral bones in children. It allows controlled rotational correction and is mainly designed for proximal fractures, malunion, nonunion, and deformities.

[0044] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A femoral intramedullary nail, characterized in that: Includes a main pin, the main pin including a distal segment, a proximal segment, and a connector for connecting the distal segment and the proximal segment, the connector including a first segment and a second segment, the first segment being threadedly connected to the distal segment, and the second segment being threadedly connected to the proximal segment.

2. The femoral intramedullary nail according to claim 1, characterized in that, The proximal end face of the distal segment and the distal end face of the proximal segment are respectively provided with a first tooth groove and a second tooth groove that are evenly distributed in the circumferential direction, and the first tooth groove and the second tooth groove mesh with each other.

3. The femoral intramedullary nail according to claim 2, characterized in that, The central angle of a single first tooth groove and the central angle of a single second tooth groove are equal and the angle range is 5°-10°.

4. The femoral intramedullary nail according to claim 1, characterized in that, The proximal end of the distal segment and the distal end of the proximal segment are respectively provided with an axial first threaded hole and a second threaded hole, and the first segment and the second segment of the connector are respectively threadedly connected to the first threaded hole and the second threaded hole.

5. The femoral intramedullary nail according to claim 4, characterized in that, The first threaded hole and the second threaded hole have the same pitch.

6. The femoral intramedullary nail according to claim 4, characterized in that, The first threaded hole and / or the second threaded hole are stepped holes.

7. The femoral intramedullary nail according to claim 4, characterized in that, The diameters at the point where the proximal end of the first threaded hole and the distal end of the second threaded hole meet are the same.

8. The femoral intramedullary nail according to claim 1, characterized in that, The proximal end face of the proximal segment is square.

9. The femoral intramedullary nail according to claim 2, characterized in that, The outer wall of the proximal section is provided with a groove for engaging the locking pin.

10. The femoral intramedullary nail according to claim 1, characterized in that, The distal end of the distal segment has a tapered tip.

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