Intramedullary nail fixing device for clavicle fracture

Abstract

The utility model belongs to the technical field of medical instruments and discloses a clavicle fracture intramedullary nail fixing device which comprises a main nail and an auxiliary nail. The main nail comprises a head section, a middle section and a tail section which are sequentially connected, a first external thread, a second external thread and a third external thread are arranged on the head section, the middle section and the tail section respectively, the tooth thickness of the second external thread is larger than that of the first external thread, a through hole and a nail hole are formed in the main nail, and the through hole sequentially penetrates through the head section, the middle section and the tail section; the auxiliary nails are inserted into the nail holes and intersect with the main nails. The main nail is used for connecting the fractured clavicle, the auxiliary nail inserted into the nail hole of the main nail can effectively prevent the main nail from rotating, and the rotation control capability is further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an intramedullary nail fixing device for clavicle fracture. Background Art

[0002] The clavicle is an "S"-shaped structure between the manubrium of the sternum and the acromion, and is the only bone support connecting the upper limbs to the trunk. The clavicle is located subcutaneously and superficially, and is prone to fracture when subjected to external forces, accounting for 5% to 10% of all fractures in the body. Traditional treatment methods in China usually use Kirschner wires or bone screws, but whether Kirschner wires or bone screws are used, there is a problem of poor ability to control rotation, and there is a risk of micro-motion of the fracture ends after surgery, resulting in failure of internal fixation, nonunion of fractures or malunion. Utility Model Content

[0003] The utility model provides a clavicle fracture intramedullary nail fixing device to solve the deficiencies of the prior art.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A clavicle fracture intramedullary nail fixation device comprises a main nail and an auxiliary nail; the main nail comprises a head section, a middle section and a tail section connected in sequence, the head section, the middle section and the tail section are respectively provided with a first external thread, a second external thread and a third external thread, the tooth thickness of the second external thread is greater than the tooth thickness of the first external thread, the main nail is provided with a through hole and a nail hole, the through hole passes through the head section, the middle section and the tail section in sequence; the auxiliary nail is inserted into the nail hole and crosses with the main nail.

[0006] In some embodiments, the auxiliary nail includes a first section and a second section connected to each other, the first section is provided with a fourth external thread, the second section gradually increases in diameter from one end adjacent to the first section to the other end, and the second section is provided with a fifth external thread.

[0007] In some embodiments, a first nail tip is disposed at one end of the head section away from the tail section, and a second nail tip is disposed at one end of the first section away from the second section.

[0008] In some embodiments, a regular hexagonal groove is provided at one end of the tail section away from the head section, and a flower groove is provided at one end of the second section away from the first section.

[0009] In some embodiments, the second external thread includes a front second external thread and a rear second external thread, and the first external thread, the front second external thread, the rear second external thread, and the third external thread are distributed in sequence.

[0010] In some embodiments, the diameter of the head section is equal to the diameter of the middle section, the diameter of the tail section is larger than the diameter of the head section, and the nail hole is located on the tail section.

[0011] In some embodiments, the nail holes are light holes.

[0012] In some embodiments, the nail hole is in communication with the through hole.

[0013] In some embodiments, the nail hole is perpendicular to the through hole.

[0014] In some embodiments, the number of the nail holes and the number of the auxiliary nails are both two, and the two auxiliary nails are parallel to each other.

[0015] Through the above technical scheme, after the clavicle fracture intramedullary nail fixation device provided by the utility model is implanted in the target position, the main nail therein connects the fractured clavicle, and the auxiliary nail inserted into the nail hole of the main nail can effectively prevent the main nail from rotating, further enhancing the rotation control ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of an embodiment of the utility model.

[0018] Figure 2 It is a three-dimensional diagram of the main nail in the embodiment of the utility model.

[0019] Figure 3 It is a front view of the main nail in the embodiment of the utility model.

[0020] Figure 4 It is a top view of the main nail in the embodiment of the utility model.

[0021] Figure 5 yes Figure 4 Sectional view along line AA.

[0022] Figure 6 yes Figure 5 A partial enlarged view of parts Ⅰ and Ⅱ in the middle.

[0023] Figure 7 It is a three-dimensional diagram of the auxiliary nail in the embodiment of the utility model.

[0024] Figure 8 It is a front view of the auxiliary nail in the embodiment of the utility model.

[0025] Fig. 9 It is a schematic diagram of an embodiment of the utility model when implanted into the clavicle.

[0026] Reference numerals:

[0027] 1-main nail; 11-head section; 111-first external thread; 112-first nail tip; 12-middle section; 121-second external thread; 1211-front second external thread; 1212-rear second external thread; 13-tail section; 131-third external thread; 132-regular hexagonal groove; 14-through hole; 15-nail hole; 2-auxiliary nail; 21-first section; 211-fourth external thread; 212-second nail tip; 22-second section; 221-fifth external thread; 222-flower groove; 3-clavicle. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0029] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] See also Figure 1-Figure 9 As shown, the utility model provides a clavicle fracture intramedullary nail fixation device, including a main nail 1 and an auxiliary nail 2. The main nail 1 includes a head section 11, a middle section 12 and a tail section 13 connected in sequence, and the head section 11, the middle section 12 and the tail section 13 are respectively provided with a first external thread 111, a second external thread 121 and a third external thread 131, and the tooth thickness of the second external thread 121 is greater than the tooth thickness of the first external thread 111 (see Figure 6 As shown in the figure, the main nail 1 is provided with a through hole 14 and a nail hole 15, and the through hole 14 sequentially passes through the head section 11, the middle section 12 and the tail section 13; the auxiliary nail 2 is inserted into the nail hole 15 and crosses the main nail 1.

[0031] See also Fig. 9As shown, in specific use, first align the fractured clavicle 3, then use the tool to drill the main nail 1 into the fractured clavicle 3 in sequence, the head section 11 and the tail section 13 are respectively located in the two fractured clavicles 3, and it is best to make the middle section 12 cross the fracture position of the clavicle 3, and use the main nail 1 to achieve the connection between the fractured clavicles 3; after the main nail 1 is implanted in the target position, first observe the direction of the nail hole 15 on the main nail 1 through the instrument, and then determine the implantation position and implantation angle of the auxiliary nail 2 according to the direction of the nail hole 15, and then the implantation operation of the auxiliary nail 2 can be performed, and the position of the main nail 1 should be kept as unchanged as possible during the implantation of the auxiliary nail 2. After the operation is completed, the auxiliary nail 2 passes through the main nail 1, and the auxiliary nail 2 and the main nail 1 are in a mutually crossed shape. The implantation of the auxiliary nail 2 can effectively prevent the main nail 1 from rotating.

[0032] In the present invention, the tooth thickness of the first external thread 111 is smaller than the tooth thickness of the second external thread 121, which is conducive to the rapid implantation of the head section 11. At the same time, the second external thread 121 with a larger tooth thickness can improve the stability of the main nail 1 after implantation. In addition, after the main nail 1 is implanted to the target position, inserting the auxiliary nail 2 into the nail hole 15 of the main nail 1 can effectively prevent the main nail 1 from rotating, further enhancing the rotation control ability. The setting of the through hole 14 makes the main nail 1 a hollow structure, which is convenient for the main nail 1 to be used in conjunction with the robot navigation device.

[0033] See also Figure 3 As shown, the middle section 12 is longer than the head section 11 and the tail section 13, and the length ratio of the head section 11, the middle section 12, and the tail section 13 is approximately 1:2:1. The ratio of the three can also be fine-tuned according to the specific conditions of the patient. In actual operation, the length of the middle section 12 is usually changed. Maintaining the aforementioned ratio of the head section 11, the middle section 12, and the tail section 13 can ensure that the main nail 1 has a relatively ideal fixing effect in the clavicle 3, and the first external thread 111 and the third external thread 131 have suitable lengths to facilitate the implantation operation of the main nail 1.

[0034] In some embodiments, the auxiliary nail 2 includes a first section 21 and a second section 22 connected to each other, the first section 21 is provided with a fourth external thread 211, the second section 22 gradually increases in diameter from one end adjacent to the first section 21 to the other end thereof, and the second section 22 is provided with a fifth external thread 221. The maximum diameter of the second section 22 needs to be greater than the diameter of the nail hole 15, so as to prevent the auxiliary nail 2 from passing through the nail hole 15 as a whole. In order to facilitate the implantation of the main nail 1 and the auxiliary nail 2 into the bone, the tooth profiles of the first external thread 111, the second external thread 121, the third external thread 131 and the fourth external thread 211 are all sawtooth-shaped. The tooth profiles of the first external thread 111 and the second external thread 121 refer to Figure 6 shown.

[0035] In order to facilitate the implantation of the main nail 1 and the auxiliary nail 2, nail tips are provided on the main nail 1 and the auxiliary nail 2. Figure 2 and Figure 8 As shown, a first nail tip 112 is disposed at one end of the head section 11 away from the tail section 13 , and a second nail tip 212 is disposed at one end of the first section 21 away from the second section 22 .

[0036] In order to facilitate the use of a screwdriver to screw the main nail 1 and the auxiliary nail 2, a regular hexagonal groove 132 is provided at one end of the tail section 13 away from the head section 11, and a flower groove 222 is provided at one end of the second section 22 away from the first section 21. It is worth noting that the regular hexagonal groove 132 on the tail section 13 and the flower groove 222 on the second section 22 can also be replaced by other non-circular grooves.

[0037] In some embodiments, the second external thread 121 is not continuous. Figure 4 As shown, the second external thread 121 includes a front second external thread 1211 and a rear second external thread 1212, and the first external thread 111, the front second external thread 1211, the rear second external thread 1212, and the third external thread 131 are sequentially spaced. Such a structural design can make the main nail 1 have less resistance during the implantation process, and at the same time ensure that the main nail 1 has better stability after being implanted.

[0038] In some embodiments, the diameter of the head section 11 is equal to the diameter of the middle section 12, the diameter of the tail section 13 is larger than the diameter of the head section 11, and the nail hole 15 is located on the tail section 13. By making the tail section 13 have a larger diameter, it is convenient to open the nail hole 15 on the tail section 13, and at the same time, it is ensured that the position of the tail section 13 where the nail hole 15 is provided has sufficient structural strength to prevent the tail section 13 from breaking at the position where the nail hole 15 is provided.

[0039] The size of the nail hole 15 should be suitable for the auxiliary nail 2 to pass through. In order to facilitate the auxiliary nail 2 to be screwed into the nail hole 15, the nail hole 15 is a smooth hole, that is, the inner wall of the nail hole 15 is smooth. In other embodiments, an internal thread matching the auxiliary nail 2 can also be provided in the nail hole 15, so that the connection between the main nail 1 and the auxiliary nail 2 can be more stable. Compared with the embodiment with a smooth inner wall of the nail hole 15, the embodiment with an internal thread in the nail hole 15 sacrifices the convenience of surgical operation to a certain extent.

[0040] In order to ensure that the position where the nail hole 15 is provided in the tail section 13 has sufficient structural strength, the nail hole 15 is connected with the through hole 14, and it is best to make the axis of the nail hole 15 coplanar with the middle diameter axis of the third external thread 131. In the embodiment where the nail hole 15 is connected with the through hole 14, it is possible to well avoid the tail section 13 from having too thin a wall thickness, thereby preventing the auxiliary nail 2 from damaging the main nail 1 during the drilling process.

[0041] In some embodiments, the nail hole 15 is perpendicular to the through hole 14, and the auxiliary nail 2 and the main nail 1 are also perpendicular to each other after assembly. The end of the auxiliary nail 2 can be closer to the cortical layer of the clavicle 3, which can further enhance the anti-rotation control ability.

[0042] In some embodiments, the number of the nail hole 15 and the number of the auxiliary nails 2 are both two, and the two auxiliary nails 2 are parallel to each other. Figure 4 As shown, the hole spacing between the two nail holes 15 is about one-third of the length of the tail section 13. In other embodiments, the two auxiliary nails 2 may also have a certain angle, such as 5 to 15 degrees. When the two auxiliary nails 2 are not parallel, there needs to be enough hole spacing between the nail holes 15 to prevent adjacent auxiliary nails 2 from interfering with each other during the operation. Generally speaking, the larger the angle between the two auxiliary nails 2, the larger the hole spacing between adjacent nail holes 15. In the embodiment where the two auxiliary nails 2 are parallel to each other, since the directions of the nail holes 15 are consistent, it is easier to determine the drilling position of the auxiliary nail 2 during the operation.

[0043] The clavicle fracture intramedullary nail fixation device provided by the utility model adopts an integrated design, which can not only firmly fix comminuted fractures, but also realize the integration of parts into a whole, which is conducive to early functional exercise for patients. In addition, since the overall structure of the clavicle fracture intramedullary nail fixation device is relatively short and easy to operate, it conforms to the concept of minimally invasive surgery and can theoretically meet the requirements of closed reduction and internal fixation operations. After the clavicle fracture intramedullary nail fixation device is implanted in the target position, biomechanical tests show that the four-point bending and torsional stability of the clavicle 3 middle section 12 fracture are better than the elastic intramedullary nail fixation strength (P<0.05), and are close to the fixation strength of the bone plate (P>0.05).

[0044] So far, the various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0045] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A clavicle fracture intramedullary nail fixation device, characterized in that: include: A main nail, comprising a head section, a middle section and a tail section connected in sequence, wherein the head section, the middle section and the tail section are respectively provided with a first external thread, a second external thread and a third external thread, the tooth thickness of the second external thread is greater than the tooth thickness of the first external thread, and the main nail is provided with a through hole and a nail hole, wherein the through hole passes through the head section, the middle section and the tail section in sequence; as well as Auxiliary nails are inserted into the nail holes and cross the main nails.

2. The clavicle fracture intramedullary nail fixation device according to claim 1, characterized in that: The auxiliary nail comprises a first section and a second section connected to each other, the first section is provided with a fourth external thread, the second section gradually increases in diameter from one end adjacent to the first section to the other end, and the second section is provided with a fifth external thread.

3. The clavicle fracture intramedullary nail fixation device according to claim 2, characterized in that: A first nail tip is disposed at one end of the head section away from the tail section, and a second nail tip is disposed at one end of the first section away from the second section.

4. The clavicle fracture intramedullary nail fixation device according to claim 3, characterized in that: A regular hexagonal groove is provided at one end of the tail section away from the head section, and a flower groove is provided at one end of the second section away from the first section.

5. The clavicle fracture intramedullary nail fixation device according to any one of claims 1 to 4, characterized in that: The second external thread includes a front second external thread and a rear second external thread, and the first external thread, the front second external thread, the rear second external thread, and the third external thread are sequentially spaced and distributed.

6. The clavicle fracture intramedullary nail fixation device according to any one of claims 1 to 4, characterized in that: The diameter of the head section is equal to the diameter of the middle section, the diameter of the tail section is larger than the diameter of the head section, and the nail hole is located on the tail section.

7. The clavicle fracture intramedullary nail fixation device according to any one of claims 1 to 4, characterized in that: The nail hole is a light hole.

8. The clavicle fracture intramedullary nail fixation device according to any one of claims 1 to 4, characterized in that: The nail hole is communicated with the through hole.

9. The clavicle fracture intramedullary nail fixation device according to any one of claims 1 to 4, characterized in that: The nail hole is perpendicular to the through hole.

10. The clavicle fracture intramedullary nail fixation device according to any one of claims 1 to 4, characterized in that: The number of the nail holes and the number of the auxiliary nails are both two, and the two auxiliary nails are parallel to each other.

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