Far-end precise locking intramedullary nail system

Abstract

The utility model discloses a far-end precise locking intramedullary nail system which comprises an intramedullary nail, an intramedullary nail locking device, an intramedullary nail locking device, an intramedullary nail locking device and an intramedullary nail locking device. The far-end hole is formed in the intramedullary nail; the far-end hole is matched with the lock nail, and the bone substance is provided with a screw-in hole upper part and a screw-in hole lower part through which the lock nail penetrates; the thickened part is arranged at the end, away from the intramedullary nail, of the lock nail, external threads are arranged on the peripheral face of the lock nail, and internal threads matched with the external threads are arranged in the lower portion of the far-end hole and the lower portion of the screwing-in hole. The inner diameter of the upper portion of the bone screwing-in hole is slightly larger than the outer diameter of the lock nail, the outer diameter of the thickened portion is gradually increased in the direction away from the intramedullary nail, when the lock nail is screwed in, the lock nail completely penetrates through the upper portion of the screwing-in hole and the far-end hole and partially extends into the lower portion of the screwing-in hole, and the thickened portion of the lock nail is embedded into the upper portion of the screwing-in hole. At the moment, the intramedullary nail can be fixed to the bone through the lock nail, displacement is avoided, and precise locking of the intramedullary nail is achieved.

Description

Technical Field

[0001] This utility model relates to the field of intramedullary nail locking technology, specifically a remote precision locking intramedullary nail system. Background Technology

[0002] An intramedullary nail is a medical device commonly used to treat fractures of long bones. It is implanted into the medullary cavity of the bone to provide stable support and help the fracture heal.

[0003] Currently, the most common method for distal locking of intramedullary nails is to pass a locking screw through the distal hole of the intramedullary nail and then screw it into the bone block. Because there is a gap between the outer diameter of the locking screw and the distal hole of the intramedullary nail, and there is also a gap between the medullary cavity and the outer diameter of the intramedullary nail, displacement will occur after surgery, resulting in misalignment of the fracture ends and prolonged healing time. Utility Model Content

[0004] The technical problem to be solved by this utility model is: to provide a distal precision locking intramedullary nail system to solve the technical problem that intramedullary nails will displace after surgery, causing misalignment of fracture ends and prolongation of healing period.

[0005] The technical solution adopted by this utility model to solve the technical problem of the device is: a distal precision locking intramedullary nail system, comprising: an intramedullary nail for inserting into the medullary cavity of the bone; a distal hole provided in the intramedullary nail; a locking screw adapted to the distal hole, and the bone is provided with an upper part and a lower part of the screw-in hole through which the locking screw passes; a thickened part provided at the end of the locking screw away from the intramedullary nail, the outer peripheral surface of the locking screw being provided with external threads, and the distal hole and the lower part of the screw-in hole being provided with internal threads adapted to the external threads.

[0006] The beneficial effects of this invention are as follows: the inner diameter of the upper part of the bone insertion hole is slightly larger than the outer diameter of the locking screw. The outer diameter of the thickened part gradually increases along the direction away from the intramedullary nail. When the locking screw is screwed in, the locking screw completely passes through the upper part and the distal hole of the insertion hole and partially extends into the lower part of the insertion hole. The thickened part of the locking screw is submerged in the upper part of the insertion hole. At this time, the intramedullary nail can be fixed to the bone by the locking screw without displacement, thus achieving precise locking of the intramedullary nail.

[0007] Preferably, it further includes:

[0008] The proximal foramen is located within the intramedullary nail.

[0009] Preferably, it further includes:

[0010] Instrument hole: The instrument hole is located at the end of the intramedullary nail furthest from the distal foramen.

[0011] Preferably, the locking pin includes:

[0012] The screw-in groove is located at the end of the locking screw that is furthest from the intramedullary nail.

[0013] Preferably, the locking pin further includes:

[0014] The vertebral end extends into the screw-in foramen.

[0015] Preferably, it further includes:

[0016] The inner hole is located within the intramedullary nail. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of a distal precision locking intramedullary nail system;

[0018] Figure 2 A cross-sectional view of a distal precision locking intramedullary nail system;

[0019] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0020] In the diagram: Intramedullary nail 1, proximal foramen 11, instrument hole 12, distal foramen 13, internal hole 14, bone 2, medullary cavity 21, lower part of screw-in foramen 22, upper part of screw-in foramen 23, locking screw 3, screw-in groove 31, thickened part 32, vertebral end 33. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] In this document, terms such as "upper," "lower," "inner," and "outer" are established based on the positional relationships shown in the accompanying drawings. Depending on the drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection. Moreover, relational terms such as "first" and "second" are only used to distinguish one component from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0023] Example

[0024] like Figure 1-3 As shown, a distal precision locking intramedullary nail system includes: an intramedullary nail 1 for insertion into the medullary cavity 21 of bone 2; a distal hole 13 disposed in the intramedullary nail 1; a locking pin 3 adapted to the distal hole 13, the bone 2 being provided with an upper part 23 and a lower part 22 for the locking pin 3 to pass through; and a thickened portion 32 disposed at the end of the locking pin 3 away from the intramedullary nail 1, the outer peripheral surface of the locking pin 3 being provided with external threads, and the distal hole 13 and the lower part 22 of the lower part 22 being provided with internal threads adapted to the external threads.

[0025] Specifically, the inner diameter of the upper part 23 of the screw-in hole in the bone 2 is slightly larger than the outer diameter of the locking screw 3. The outer diameter of the thickened part 32 gradually increases along the direction away from the intramedullary nail 1. When the locking screw 3 is screwed in, the locking screw 3 completely passes through the upper part 23 of the screw-in hole and the distal hole 13, and partially extends into the lower part 22 of the screw-in hole. The thickened part 32 of the locking screw 3 is submerged in the upper part 23 of the screw-in hole. At this time, the intramedullary nail 1 can be fixed to the bone 2 by the locking screw 3 without displacement, thus achieving precise locking of the intramedullary nail 1.

[0026] In detail, in this embodiment, the upper part 23 of the screw-in hole is a hole with a diameter of 5.2, the lower part 22 of the screw-in hole is an M5 threaded hole, the outer diameter of the locking pin 3 is 5, and the distal hole 13 is an M5 threaded hole. The diameter of the thin end of the thickened part 32 is 5, and the diameter of the thick end of the thickened part 32 is 5.8.

[0027] Furthermore, it also includes a proximal hole 11, which is provided in the intramedullary nail 1. The proximal hole 11 is used to screw in the anti-tension screw, which is used to extend into the femoral head to provide support. The tension force generated by the varus stress of the femoral head can cause the intramedullary nail 1 to shift, resulting in poor bone surface recovery and adverse consequences such as hip varus. The anti-tension screw resists the tension force, thereby eliminating the tendency of the fixation nail to move inward and achieving precise locking of the intramedullary nail 1.

[0028] Furthermore, it also includes an instrument hole 12, which is located at the end of the intramedullary nail 1 away from the distal hole 13. The instrument hole 12 is used to connect external components and to insert the intramedullary nail 1 into the medullary cavity 21 for initial fixation.

[0029] Furthermore, the locking pin 3 includes a screw-in groove 31, which is located at the end of the locking pin 3 away from the intramedullary nail 1. The screw-in groove 31 facilitates the screwing in of the locking pin 3, and the screw-in groove 31 is preferably an internal hexagonal groove.

[0030] Furthermore, the locking pin 3 also includes a vertebral end 33, which extends into the screw-in hole. The vertebral end 33 makes it easier for the locking pin 3 to be screwed in.

[0031] Furthermore, it also includes an inner hole 14, which is disposed in the intramedullary nail 1. The inner hole 14 is used to reduce the production cost of the intramedullary nail 1.

[0032] The technical features described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A distal precision locking intramedullary nail system, characterized in that, include: Intramedullary nail (1), said intramedullary nail (1) is used to extend into the medullary cavity (21) of bone (2); Distal hole (13), the distal hole (13) is provided in the intramedullary nail (1); Locking pin (3), the distal hole (13) is adapted to the locking pin (3), the bone (2) is provided with the upper part (23) and the lower part (22) of the screw-in hole through which the locking pin (3) passes; The thickened portion (32) is located at one end of the locking pin (3) away from the intramedullary nail (1). The outer peripheral surface of the locking pin (3) is provided with an external thread, and the distal hole (13) and the lower part (22) of the screw-in hole are provided with internal threads adapted to the external thread.

2. The distal precision locking intramedullary nail system according to claim 1, characterized in that, Also includes: A proximal hole (11) is provided in the intramedullary nail (1).

3. The distal precision locking intramedullary nail system according to claim 1, characterized in that, Also includes: Instrument hole (12) is provided at one end of the intramedullary nail (1) away from the distal hole (13).

4. The distal precision locking intramedullary nail system according to claim 3, characterized in that, The locking pin (3) includes: A screw-in groove (31) is provided at one end of the locking nail (3) away from the intramedullary nail (1).

5. The distal precision locking intramedullary nail system according to claim 1, characterized in that, The locking pin (3) also includes: Vertebral end (33) extends into the screw hole.

6. The distal precision locking intramedullary nail system according to claim 1, characterized in that, Also includes: An inner hole (14) is provided in the intramedullary nail (1).

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