KR101451520B1 - Interlocking intramedullary nail - Google Patents

Abstract

Disclosed interlocking interamedullary nail is characterized by comprising a hollow nail body including an internal pipe in the longitudinal direction; an upper through hole formed on the proximal part of the nail body and allowing a proximal part interlocking screw to be inserted; and at least one end part through hole formed on the distal part of the nail body and allowing an end interlocking screw to be inserted, wherein the end part through hole includes a screw protrusion screw bonding with the end interlocking screw for the end interlocking screw to be coupled with the nail body while half fixed.

Description

Interlocking intramedullary nail.

The present invention relates to a metal nail used in the treatment of femur fracture, and more particularly, to an interlocking intramedullary nail which improves fracture healing by increasing the screwing force of metal in the bone marrow.

In general, occlusive intramedullary nail fixation is used to fix the fracture part in the cavity when the fracture occurs in the femur, and the conventional interlocking intramedullary nail is used in Korean Utility Model Registration No. 20 -0212880 and 20-0309570.

The above-described prior art interlocking intramedullary nail has a structure in which a distal end hole is formed merely as a hole in order to fix a distal portion of the femur, so that a distal interlocking screw can not be screwed into a metal fixture Through the through-hole of the distal end to the bone.

However, such prior art interlocking intramedullary nail is effective enough to block the upward and downward movement of the end occlusal screw to a certain extent, because the distal end hole only serves as a passage for passing the end occlusal screw through , Especially in the occlusal osteomyelitis, weakening of the screw fixation force on the cross section of the metal is caused, and the fracture healing is delayed or halved.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the fixation force of the endoscopic screw to the intramedullary nail and to improve the fixation force on the transverse section of the intramedullary metal, And to provide an interlocking intramedullary nail having improved healing effects.

In order to solve the above-mentioned problems, according to the present invention, there is provided an interlocking intramedullary nail comprising: a hollow metal body having an inner tube in the longitudinal direction; An upper through hole formed in the proximal portion of the metal fixture body and into which a proximal interlocking screw is inserted; And at least one distal through-hole formed at a distal portion of the metal cap main body and into which an end closure screw is inserted, wherein the distal clasp screw is half-fixed to the metal cap main body, And the through hole is provided with a screw projection which is screwed with the end occlusal screw.

The screw projection preferably includes a first screw projection and a second screw projection symmetrically provided with the first screw projection.

The first screw protrusion and the second screw protrusion may include a protrusion protruding inwardly of the distal end through-hole and a thread portion connected to an end of the protrusion and coupled to a threaded bone of the end occlusion screw.

It is preferable that a plurality of the end through holes are formed, and the screw projections are provided in any one of the plurality of end hole portions.

Since the interlocking intramedullary nail of the present invention can be provided with the end occlusal screw in a semi-fixed state in the end opening, it enhances the fixing force of the end occlusal screw to the transverse section of the intramedullary nail, The shaking can be prevented, and the effect of the fracture treatment can be doubled.

In addition, unlike normal screw connection, it is semi-fixed, so it can be easily removed to remove end occlusal screw.

1 is a perspective view illustrating a state in which a proximal occlusal screw 22 and a distal end occlusal screw 30 are engaged with an interlocking intramural cavity 10 according to an embodiment of the present invention.
FIG. 2 is a front view of the interlocking intramuscular nail 10 shown in FIG. 1 viewed from the front, an enlarged cross-sectional view showing an enlarged view of the first end through-
Fig. 3 is a cross-sectional view and partially enlarged view of the interlocking intramuscular nail 30 shown in Fig.
Fig. 4 is an enlarged cross-sectional view of the line IV-IV in Fig. 1 on an enlarged scale.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention.

1 to 4, an interlocking intramolecular intramedullary nail 10 according to an embodiment of the present invention includes a metal can body 11, an upper through hole 24, a first end through-hole 26, A distal end through-hole 28, a first screw projection 34, and a second screw projection 36. [

1, the metal ball main body 11 is a hollow rod type having an inner tube 32 (see FIG. 3), and is formed to have various diameters and lengths, and may have a straight or curved shape And may be formed in a curved shape with a certain curvature. The metal fixture body 11 can be roughly divided into a proximal portion 13 at the upper portion and a distal portion 15 at the lower portion.

1, the upper through hole 24 is formed obliquely at an angle to the proximal portion 13 of the metal fixture body 10 and is inserted into the proximal portion 13 of the proximal portion 13, (Not shown).

1 to 3, the first end through-hole 26 and the second end through-hole 28 are formed in the distal portion 15 of the metal can body 11, and the first end through- A second end through-hole 28 is formed. The second end through-hole (28) is formed with a long hole larger than the first end through-hole (26).

Referring to FIGS. 2 and 3, the first screw protrusions 34 and the second screw protrusions 36 have the same shape and are symmetrical to each other at a central portion of the first end through-hole 26. The first screw projection 34 and the second screw projection 36 are protruded from the center of the first end through-hole 26 to the inside of the first end through-hole 26, A protrusion 34a extending to the center of the distal through hole 26 and a threaded portion 34b extending integrally at the end of the protrusion 34a (see FIG. 4).

The process of attaching the interlocking intramedullary nail 10 according to an embodiment of the present invention to the femur is as follows.

After a hole is drilled in the proximal portion of the femur (not shown), the interlocking intramedullary nail 10 according to the present embodiment is inserted, and the first end closure screw 30 is rotated in the first end hole 26 As shown in FIGS. 1 and 4. The screw portion 34b of the first and second screw projections 34 and 36 is engaged with the threaded portion 33 formed between the screw thread 31 and the thread 31 of the first end occlusion screw 30, The screw (30) is inserted into the first end through-hole (26).

The threaded portion 34b of the first and second screw projections 34 and 36 is inserted into the first end through-hole 26 as shown in FIG. 4, and the first and second screw projections 34 and 36 are inserted into the first end hole 26, The first end clenching screw 30 is maintained in the semi-fixed state in the metal fixture 11 because the state where the first end clenching screw 30 is engaged with the threaded boss 33 of the end clenching screw 30 is maintained. Although the semi-fixed state is not completely fixed as in the case of a general screw connection, when the first end clasp screw 30 is fixed to the metal fixture 11 in a state in which it can not move in the direction of arrow x (cross- (Left-right direction in Fig. 4) or arrow z-direction (up-down direction in Fig. 1).

In the prior art metal nail, the first end occlusion was a simple pore shape, so that the first end occlusal screw could flow in the x direction (cross-sectional direction), which caused shaking of the metal in the bone marrow, And the calibration effect was reduced by half.

However, since the intermeshing intramyullary nail 30 of the present invention is in a semi-fixed state in which the screwing force with respect to the cross-sectional direction (the x-direction and the cross-sectional direction in Fig. 4) is improved, it is impossible to flow in the x-direction, and has some clearances in the y-direction and the z-direction. In particular, the stabilization of the fracture is improved and the healing effect of the fracture is doubled. In addition, in the up and down directions (the z direction in Fig. 1) and in the left and right direction (y direction in Fig. 4) Therefore, it is advantageous that the effect of healing of the fracture is greatly improved because the metal nail is firmly fixed to the proximal portion of the femur.

In the present invention, the first end clenching screw 30 should be coupled to the metal cap main body 11 of the first end through-hole 26 in a semi-fixed state, and should not be in a completely fixed state like a general screw connection. The key point of the present invention is also a configuration in which the first-end occlusal thread 30 is held in a semi-fixed state with respect to the metal fixture 11.

If a plurality of threaded protrusions are formed in the first end through-hole 26 and the first end clasp screw 30 is completely fixed to the metal fixture 11, the first end clasp screw 30, The micro-stress is blocked, and the fracture is prevented from being filled or grown at the fractured portion, thereby reducing the healing effect of the fracture.

That is, as the bone is grown into the fractured portion, a fine force is applied to the first end occlusal screw 30, and by this force, the first end occlusal screw 30 must be moved in a direction to receive a little stress. However, in the completely fixed state, the force opposite to this stress is applied to the growing bone, thereby blocking the micro-stress and adversely affecting the recovery or growth of the bone. Therefore, the present invention must be in a semi-fixed state, and maintaining the semi-fixed state is convenient in removing the first-end occlusal screw 30 in the future.

The embodiments of the interlocking intramedullary nail 10 of the present invention described above are merely illustrative, and those skilled in the art will appreciate that various modifications and equivalent embodiments can be made without departing from the scope of the present invention. You can see that it is possible. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

10: Interlocking intramedullary nail
11: metal core body
13: proximal
15: distal
22: Proximal occlusal screw
24: upper opening
26,28: first and second end apertures
30: First end occlusal screw
32: Internal tube
24, 36: first and second screw projections
34a:
34b:

Claims (4)

A hollow metal core body having an inner tube in the longitudinal direction;
An upper through hole formed in the proximal portion of the metal fixture body and into which a proximal interlocking screw is inserted; And
And at least one distal through-hole formed at a distal portion of the metal ball main body and into which a distal interlocking screw is inserted,
Wherein the distal end through hole is provided with a screw projection threadedly engaged with the distal end occlusion screw so that the distal end occlusion screw can be engaged with the metal fixation body in a semi-fixed state.
The method according to claim 1,
Wherein the screw protrusion includes a first screw protrusion and a second screw protrusion symmetrically provided with the first screw protrusion.
The connector according to claim 2, wherein the first screw projection
And a threaded portion connected to an end of the projecting portion and coupled to a threaded bone of the distal end occlusion thread.
The method according to claim 1,
Wherein a plurality of the distal end through-holes are formed, and the screw projections are provided in any one of the plurality of end through-holes.

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