JP4104958B2 - Osteosynthesis nail - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an osteosynthesis nail used for ultrasonic treatment of fractures.
[0002]
[Prior art]
FIG. 3 shows a conventional fracture treatment method using an osteosynthesis nail.
First, as shown in FIG. 2A, two elongated plates 3 and two osteosynthesis nails 4 are prepared for the fracture portion 2 of the bone 1. The plate 3 is provided with insertion holes 3a at both ends, and the osteosynthesis nail 4 has a thin cylindrical shape with a sharp tip as shown in the figure.
[0003]
Next, as shown in FIG. 2 (b), the plates 3 are placed on both sides of the fractured portion 2 of the bone 1 with the fractured portion 2 butted, and the two osteosynthesis nails 4 are attached to the fractured portion 2. The plate 3, the bone 1, and the plate 3 are inserted through the insertion holes 3 a of the plate 3 on both sides, and the three are fixed integrally. When a certain period of time passes in this state, bone tissue is generated in the fractured part 2 and the fractured part 2 can be joined and fixed.
[0004]
In order to promote the generation of the bone tissue, it is conceivable to apply ultrasonic vibration to the osteosynthesis nail 4, but the conventional osteosynthesis nail is not premised on applying ultrasonic vibration.
[0005]
Therefore, no suitable patent document can be cited for an osteosynthesis nail that presupposes applying ultrasonic vibration to the affected area.
[0006]
[Problems to be solved by the invention]
However, the conventional method of applying ultrasonic vibration to the osteosynthesis nail 4 cannot sufficiently transmit the vibration to the fractured part 2, and therefore the effect of promoting the generation of bone tissue cannot be sufficiently obtained. There is a problem that it takes a long time to generate bone tissue.
[0007]
The present invention is intended to solve the above-described problems, and an object of the present invention is to provide an osteosynthesis nail that can efficiently transmit ultrasonic vibration to a fractured portion.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an osteosynthesis nail according to the present invention is inserted into a bone around a fractured portion to fix the fractured portion, and is inserted by applying ultrasonic vibration from the outside. An osteosynthesis nail that transmits the ultrasonic vibration to a bone to promote generation of bone tissue in the fracture portion, and is formed along the axial direction on the circumferential surface of the rod-shaped core material and the core material , A plurality of ridges and grooves provided alternately, and between the ridges , the outer peripheral surface is stretched so as to exist inside the ridges, and both edges are side surfaces of the ridges, respectively. And a thin plate that is resonated by the ultrasonic vibration .
[0010]
[Action]
Therefore, according to the present invention, by applying ultrasonic vibration to the nail for osteosynthesis, since the thin plate resonates, the vibration energy is efficiently transmitted to the fracture, thus, it is carried out rapidly the production of bone tissue Can do.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an osteosynthesis nail 15 according to a first embodiment of the present invention.
As shown in FIGS. 2A and 2B, a plurality of groove portions 12 and protruding stripe portions 13 are alternately provided in the axial direction on the peripheral surface of a thin rod-shaped core member 11 having a sharp tip. Concavities and convexities 13 a are formed on the outer peripheral surface of the ridge 13. Further, a thin plate 14 is stretched between the ridges 13. As a material of the core material 11 and the thin plate 14, for example, titanium or the like is used.
[0012]
As shown in the figure, the thin plate 14 is welded to the side surface of the ridge portion 13 below the concavo-convex portion 13a at both edges. For this reason, the surface of the thin plate 14 exists inside the outer peripheral surface of the uneven part 13a.
[0013]
This osteosynthesis nail 15 is used in FIG. 3 in place of the conventional osteosynthesis nail 4 and is in the state shown in FIG. The bone 1 is previously provided with a through hole for inserting the osteosynthesis nail 15, and the osteosynthesis nail 15 is inserted into the through hole to achieve the above state. Next, when ultrasonic vibration is applied to the osteosynthesis nail 15 from an external ultrasonic transmission device, the osteosynthesis nail 15 vibrates. At this time, the thin plate 14 resonates inside the bone 1, and the diaphragm Acts as
[0014]
In this case, since the surface of the thin plate 14 is inside the outer peripheral surface of the uneven portion 13 a , the thin plate 14 can vibrate in the groove 12. As the thin plate 14 is ultrasonically vibrated in this way, vibration energy is efficiently transmitted to the fractured part 2 as compared with the case where the conventional osteosynthesis nail 4 without the thin plate 14 is used, and bone tissue is quickly generated. be able to.
[0015]
In the above-described embodiment, the convex and concave portion 13 is provided with the concave and convex portion 13a. However, when the function of preventing the bone joining nail 15 from coming off from the bone is unnecessary, the concave and convex portion 13a can be omitted. . Also in that case, both edge portions of the thin plate 14 are welded to the side surfaces of the ridge 13 so that the surface of the thin plate 14 exists inside the outer peripheral surface of the ridge 13. Further, as the concavo-convex portion 13a, for example, a concavo-convex portion having a spiral locus by rotation, such as a reamer for screw machining, may be provided so as to be screwed into the bone.
[0016]
FIG. 2 shows an osteosynthesis nail 16 according to a second embodiment of the present invention.
The osteosynthesis nail 16 according to the present embodiment is provided with a hollow portion 11a inside a thin rod-shaped core material 11 with a sharp tip as shown in FIG. That is, the core material 11 is cylindrical. FIG. 2B shows a hollow portion 11b having another shape, in which a plurality of thin holes are provided in the core material 11. FIG.
[0017]
The osteosynthesis nail 16 is used in place of the conventional osteosynthesis nail 4 in FIG. 3, and the osteosynthesis nail 16 is inserted into the through hole provided in the bone 1 to achieve the state shown in FIG. Next, when ultrasonic vibration is applied to the osteosynthesis nail 15, the osteosynthesis nail 16 vibrates. At this time, air resonance also occurs inside the cavity 11a or 11b, so that the vibration energy is efficiently obtained. It is transmitted to the fractured part 2 and bone tissue can be quickly generated.
[0018]
The shape of the hollow portion in the core material 11 is not limited to that shown in FIGS. Further, a screw portion may be provided on the outer peripheral surface of the core material 11 and screwed into the through hole of the bone joining nail 16.
Moreover, the cross-sectional shape of the core material 11 in each embodiment is not restricted to the shape shown in FIG. 1, FIG. 2, A various deformation | transformation is possible.
[0019]
【The invention's effect】
As described above, according to the osteosynthesis nail according to the present invention, the effect of promoting the generation of bone tissue in ultrasonic treatment of a fractured part can be enhanced, and the treatment time is longer than that of a conventional osteosynthesis nail. It can be shortened.
[Brief description of the drawings]
1 is a perspective view and a cross-sectional view showing a nail for osteosynthesis according to the present onset Ming embodiment.
FIG. 2 is a perspective view showing an osteosynthesis nail according to a reference example .
FIG. 3 is an exploded perspective view and a side view showing a fracture treatment method using a conventional osteosynthesis nail.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bone 2 Fracture part 3 Plate 3a Insertion hole 11 Core material 1 3 Convex line part 13a Concavity and convexity part 14 Thin plate 1 5 Bone joint

Claims (2)

The fractured portion is inserted into a bone around the fractured portion to fix the fractured portion, and by applying ultrasonic vibration from the outside, the ultrasonic vibration is transmitted to the inserted bone to generate bone tissue in the fractured portion. An osteosynthesis nail to promote,
A rod-shaped core material ;
Protruding ridges and grooves formed on the peripheral surface of the core member along the axial direction, and provided alternately in the circumferential direction, and
A thin plate that is stretched between the ridges so that the outer peripheral surface is present inside the ridges, both edges are fixed to the side surfaces of the ridges, and resonates by the ultrasonic vibration. An osteosynthesis nail characterized by comprising. The bone nail according to claim 1 , wherein an uneven portion is formed on an outer peripheral surface of the protruding portion.

Images