TWM480987U - Structure of cap screw - Google Patents

Description

Screw structure

The present invention relates to a screw structure, and more particularly to a screw structure having a female nail and a nail which can be movably engaged.

The relationship between the thigh femur and the calf's tibia is driven by muscles and ligaments, and since most movements must be performed by the movement between the thigh and the calf, the collateral movement damage most often occurs.

When the ligament is damaged, it is a common surgical method to transplant the autologous ligament of the allogenic ligament or other parts to the damaged area for reconstruction. In this surgical procedure, one end of the autologous ligament for transplantation is fixed to the femur, and the other end of the autologous ligament is fixed to the tibia.

However, the existing ligament grafting device A, such as the Endobutton, has a structural diagram as shown in FIG. 5A, and its use diagram is as shown in FIG. 5B. Specifically, when using the transplanting device A, it is necessary to pull out the hard bone from the femoral end and then level it to create a gap, and in order to tighten, it will also cause an axial tensile effect, and at the same time, because the system is stuck in the hard On the bone, it leads to the extension of the total length of the ligament 5', which makes it easy for the ligament 5' to swing in the intra-bone tunnel and produce a wiper effect. The surface foreign body sensation also always exists.

In addition, the existing ligament grafting device B, such as the interference screw device, is schematically illustrated as shown in FIG. 5C. Specifically, it is also a fixed way of using the compression ligament 5', so that it will have the disadvantage of expanding the tunnel when implanted. Moreover, because of the fixing manner of the compression ligament 5', the ligament 5' is more likely to be damaged by pulling. .

Therefore, how to provide a surgical structure that can be fixed in the bone during ligament reconstruction and avoids improper compression and ligament torsion is an urgent problem to be solved in the industry.

In view of the various deficiencies of the prior art, one of the main purposes of the present invention is to provide a structure that can be fixed in the bone when the ligament is transplanted, and avoids improper compression and ligament twisting.

In order to achieve the above and other objects, the present invention provides a screw structure for performing a ligament reconstruction operation, comprising: a female nail for being disposed in a bone, and having a thread formed outside the outer peripheral surface of the female nail, and forming a connection space inside the female nail; and a sub-nail having a first connection portion and a second connection portion, wherein the first connection portion is inserted into the connection space to be connected to the female pin, the second connection The department is used to connect a ligament. In one embodiment, the staple system can be placed on the femur and the ligament can be attached between the femur and the tibia.

Compared with the prior art, since the technique of the present invention can fix the ligament to the femur and the tibia by the female nail and the sub-nail which can be matched with each other, any stress which causes the ligament to be improperly twisted can be obtained by the mother. The active relationship between the nail and the nail is absorbed, thereby achieving a surgical goal that does not cause the ligament to be improperly twisted.

1,2,3‧‧‧screw structure

|10,20,30‧‧‧ Female nails

11,21,31‧‧‧

100,200,300‧‧‧ external thread

101,201,301‧‧‧Connected space

1010, 2010‧‧‧ internal thread

1100, 2101‧‧‧ connecting thread

302‧‧‧Flange

3100‧‧‧ hook

4,6‧‧‧ stitching

5, 5'‧‧ ligaments

7‧‧‧ bone nails

8‧‧‧ femur

9‧‧‧胫骨骨

A, B‧‧‧ transplant equipment

1 is a schematic structural view of an embodiment of a screw structure of the present invention; FIG. 2 is a schematic structural view of another embodiment of the screw structure of the present invention; and FIG. 3 is a structure of another embodiment of the screw structure of the present invention; FIG. 4 is a schematic view showing the application of the screw structure of the present invention; FIG. 5A is a schematic structural view of the existing transplanting device; FIG. 5B is a schematic view of the application of the transplanting device shown in FIG. 5A; and FIG. 5C It is a schematic diagram of the application of another existing transplant device.

The structure, the proportions, the sizes and the like of the drawings are only used to cope with the contents disclosed in the specification for the understanding and reading of those skilled in the art, and are not intended to limit the conditions for the implementation of the present invention. Therefore, it is not technically meaningful. Any modification of the structure, change of the proportional relationship or adjustment of the size should not be affected by the effect of the creation and the purpose that can be achieved. The technical content can be covered. In the meantime, the terms "upper", "lower" and "one" as used in the specification are merely for convenience of description, and are not intended to limit the scope of the invention, the relative relationship may be changed or Adjustments, if there is no material change in the content of the technology, are also considered to be the scope of implementation of this creation.

Please refer to Figure 1 first to understand an embodiment of the present case. As shown, the screw structure 1 includes a female nail 10 and a sub-nail 11.

The female nail 10 is disposed in a bone and has a peripheral surface formed on the female nail 10 The external thread 100 and the connection space 101 formed inside the female nail 10. In one embodiment, the staple 10 can be placed in the femur. The sub-nail 11 is provided with a first connecting portion 110 and a second connecting portion 111. The first connecting portion 110 is inserted into the connecting space 101 to be movably connected to the female nail 10, and the second connecting portion 111 is provided for Connect a ligament.

In the present embodiment, the connection space 101 can be provided with an internal thread 1010, and the first connection portion 110 is provided with a connection thread 1100 corresponding to the internal thread 1010, thereby completing the movable connection. The pitch of the internal thread 1010 can be smaller than the pitch of the external thread 100. During the operation, the female nail 10 is twisted and locked by the tool, and the nail 11 is driven into the female nail from the axial direction, but the nail 11 is not excessively twisted. However, in order to simplify the explanation, the details of the operation during the operation are omitted in this case.

Furthermore, as shown in Fig. 2, another embodiment of the present invention is shown. In the present embodiment, the female nail 20 also has a thread 200 and a joint space 201 similar to those of the foregoing embodiment. The staple 21 also has a first connecting portion 210 and a second connecting portion similar to the members of the foregoing embodiment. 211. Different from the foregoing embodiment, the internal thread 2010 can be formed only in a portion of the connection space 201 near one end of the first connection portion 210, as shown, and the connection thread 2101 can be formed only in The first connecting portion 210 is away from a portion of one end of the second connecting portion 211 as shown. Further, the length of the region forming a portion of the internal thread 2010 may be equal to the length of the region forming a portion of the connecting thread 2101. In this embodiment, after the first connecting portion 210 is completely inserted into the connecting space 201, the rotation of the female nail 20 and the sub-nail 21 does not interlock, that is, the sub-nail 21 is idling relative to the female nail 20, so In addition, the female nail 20 can drive the sub-nails 21 to a predetermined position during the operation, and further absorb the stress that causes the ligaments to be improperly twisted.

Further, as shown in Fig. 3, another embodiment of the present invention is shown. In this implementation In the example, the female nail 30 has the same external thread 300 and the joint space 301 similar to those of the foregoing embodiment, and the female nail 31 also has the first connecting portion 310 and the second connecting portion 311 which are similar to the members of the foregoing embodiment.

Different from the foregoing embodiment, the connecting space 301 can be inserted into one end of the first connecting portion 310 to form a flange 302, and the first connecting portion 310 can be elasticized away from one end of the second connecting portion 311. The hook is 3100. When the insertion is performed, the elastic hook 3100 will first contract inward due to the abutment of the flange 302. After the hook 3100 passes the flange 302, the elastic hook 3100 will return to its original state due to its elasticity. To create abutment with the flange 302, thereby completing the movable connection between the female nail 30 and the sub-nails 31. At the same time, in actual implantation, the female nail 30 will first lock into the femur, and the female nail 31 can be fixed in the female nail 30 by reverse pulling. In contrast, in the actual embodiment, the sub-nail 11 (21) can first lock the female nail 10 (21) a small number of threaded teeth, and then carry the female nail 11 through the female nail 10 (21). twenty one).

In this embodiment, the length of the flange 302 can be equal to the length of the area where the first connecting portion 310 does not form the hook 3100. The second connecting portion 311 can be provided with a channel 3110 formed in the second connecting portion 311. The channel 3110 is for suture passing through to connect the ligament for transplantation. The channel 3110 can be disposed perpendicular to the first connecting portion 310.

Of course, the other embodiments described above may include a channel 3110 formed in the second connecting portion 311. In any of the embodiments of the present invention, the diameter of the female nail 10 (20 or 30) may be equal to the diameter of the second connecting portion 111 (211 or 311). In addition, after the completion of the implantation, since the rotation of the sub-nails 11 (21, 31) is not restrained, the absence of excessive twisting is not caused.

When the actual operation is completed, as shown in Fig. 4, the screw structure 1 (2 or 3) can be embedded in the femur 8, and the sub-nail is connected to one end of the ligament 5 for transplantation by the suture 4, and the ligament 5 is another The end is spliced with a suture 6 which is fixed by the bone nail 7 on the hard bone region of the humerus 9, that is, the ligament 5 can be connected between the femur 8 and the tibia 9 because the nail 7 is fixed to On the hard bone area of the tibia 9, it is possible to avoid the pulling of the ligament and the loss of the foreign body sensation of the user as in the prior art. Furthermore, the screw structure 1 (2 or 3) can be placed in the region of the femur 8 away from the tibia 9 after the implantation is completed, that is, the distal end of the femur 8 (distal) In one of the areas, the advantage is that the length required for the ligament implant is reduced, in addition to the higher availability, while avoiding the low stiffness caused by the ligament implant length being too long, so that the surgery is completed. After that, there is a problem of insufficient stability.

Compared with the prior art, the screw structure of the present invention can be matched by the mutual relationship between the female nail and the nail, but at the same time, the characteristics of the stress can be absorbed by the structural characteristics, thereby avoiding improper twisting of the ligament for transplantation. The stress is directly applied to the ligament, in other words, because the active relationship between the female nail and the sub-nail can absorb the stress, not only can the operation be successfully completed, but the probability of improper twisting of the ligament is also greatly reduced, and at the same time, there is no conventional technology. Gap, stretcher effect, wiper effect, surface foreign body sensation, or improper expansion of the implanted tunnel.

The above embodiments are intended to illustrate the principles of the present invention and its effects, and are not intended to limit the present invention. Anyone who is familiar with the art may modify the above embodiments without departing from the spirit and scope of the creation. Therefore, the scope of protection of this creation should be as listed in the scope of patent application described later.

1‧‧‧screw structure

10‧‧‧ mother nail

11‧‧‧Segment

100‧‧‧ external thread

101‧‧‧Connected space

1010‧‧‧ internal thread

Claims (10)

A screw structure for performing ligament surgery, comprising: a female nail for being disposed in a bone, having a thread formed outside the outer peripheral surface of the female nail, and a connection space formed inside the female nail; and a sub-nail The first connecting portion and the second connecting portion are provided, wherein the first connecting portion is inserted into the connecting space to connect with the female pin, and the second connecting portion is for connecting a ligament. The screw structure of claim 1, wherein the ligament is connected between a femur and a tibia; the connection space is provided with an internal thread, and the first connection portion has a connection corresponding to the internal thread Thread. The screw structure of claim 2, wherein the internal thread has a pitch smaller than a pitch of the external thread. The screw structure of claim 2, wherein the internal thread is formed in a portion of the connecting space that is inserted into one end of the first connecting portion, and the connecting thread is formed in the first portion. The connecting portion is away from a partial region of one end of the second connecting portion. The screw structure of claim 4, wherein a length of a portion of the inner thread forming portion is equal to a length of a portion of the connecting thread. The screw structure of claim 1, wherein the ligament is connected between a bone and a tibia; the connection space is configured to form a flange at one end of the first connection portion, the first connection The portion away from the end of the second connecting portion forms a resilient hook. The screw structure of claim 6, wherein the length of the flange is equal to the length of the region where the first connecting portion does not form the hook. The screw structure according to claim 1, wherein the ligament is connected between a femur and a tibia; and the second connecting portion has a passage formed in the second connecting portion, the passage is for a slit A thread passes through to join the ligament. The screw structure of claim 8, wherein the passage is disposed perpendicular to the first connecting portion. The screw structure according to any one of claims 1 to 9, wherein the ligament is connected between a bone and a tibia; the diameter of the female nail is approximately equal to the diameter of the second connecting portion, wherein The screw structure is disposed in a region of the femur that is away from one third of the tibia.