CN218870437U - Pressurization bone nail - Google Patents

Abstract

The utility model belongs to be suitable for orthopedic surgery's medical instrument field, concretely relates to pressurization bone nail, include: a bend, a first leg, and a second leg, the bend configured as an inelastic arc; the first nail leg extends out of one end of the bending part for a certain length; the second nail leg extends out of the other end of the bending part for a certain length, and the length of the second nail leg is smaller than that of the first nail leg; the axis of the first leg along its length intersects the axis of the second leg along its length at an angle a to one side of the convex surface of the bend. The utility model discloses a bone nail can pressurize the fracture bone for a long time, and the stability of postoperative is good, and the structure of this bone nail is very simple simultaneously, and the operation is also very simple and convenient during the use, only needs to insert the two nail legs of bone nail in the pre-drilling of fracture line both sides, presses the flexion and can pressurize the bone section.

Description

Pressure bone nail

Technical Field

The utility model belongs to the field of medical equipment suitable for orthopedic surgery, in particular to a pressurizing bone nail.

Background

In the field of orthopedic surgery, it is common to rejoin fractured bones. The success of a surgical procedure is generally dependent on the ability to re-approximate the bone at the fracture, the amount of compression achieved between bone sections, and the ability to maintain that compression over a period of time. If the surgeon fails to bring the bone sections into close contact, there will be gaps between the bones at the fracture and bone tissue will need to fill the gaps before complete healing can occur. In addition, excessive clearance at the fracture allows movement between the bones at the fracture, thereby damaging the healing tissue and thus slowing the healing process. Optimal healing requires that the bone sections be in intimate contact with each other and that a compressive load be applied and maintained between the bones at the fracture.

The bone nail with the pressurizing effect in the prior art pressurizes the bone at the fracture position by the elasticity of two nail legs. For example publication No. CN106413575B discloses a staple comprising: a bridge, a first leg and a second leg, the bridge being inelastically extendable, the first and second legs connected to the bridge and configured to elastically bend such that the first and second legs are angled toward each other when in an untensioned condition, the legs extending substantially parallel when the bridge is elastically tensioned to an extended condition, and when the legs are then disposed in predrilled holes on opposite sides of a fracture line, releasing the loading force on the staple will provide compression across the fracture line through the bridge and the first and second legs. The patent mainly compresses bones at the fracture part through the contraction of two legs and a bridging piece with elasticity. A pressurizing bone nail which has a different pressurizing principle for bones at fracture positions from the technical scheme is provided.

Disclosure of Invention

The utility model provides a pressurization bone nail, it can pressurize the skeleton of fracture department for a long time, makes the bone section in close contact with each other, and the stability of postoperative is good.

The utility model provides a technical scheme is:

a pressurized bone nail for treating a fracture of a shaft, comprising: a bend, a first leg, and a second leg, the bend configured as an inelastic arc; the first nail leg extends out of one end of the bending part for a certain length; the second nail leg extends out of the other end of the bending part for a certain length, and the length of the second nail leg is smaller than that of the first nail leg; the axis of the first leg along its length intersects the axis of the second leg along its length at an angle a to one side of the convex surface of the bend.

The utility model discloses a pressurization bone nail, wholly establish to rigidity and "√" shape through pressurization bone nail, pressurization bone nail is inserted in the pre-drilling hole on the both sides of broken line, earlier insert in the pre-drilling hole with longer nail leg during operation, with the position of fixed pressurization bone nail, in shorter nail leg also inserts another pre-drilling hole, two nail legs along with pressurization bone nail stretch toward the bone more, the bone surface under the pressurization bone nail is more and more near from the distance of flexion, the distance of two nail legs of bone surface department is littleer and less promptly, shorter nail leg drives the bone of fracture department toward one side of longer nail leg this moment and is close to, thereby make the bone fracture seam of fracture department extrude each other between the bone section more and less.

Preferably, the intersection angle α is 5 ° to 15 °

Preferably, the intersection angle α is 7.6 °.

Preferably, at least one of the free ends of the first leg and the second leg is pointed.

Preferably, at least one end face of the free end of the first nail leg and the free end of the second nail leg is an arc face.

Preferably, the radius of the circular arc is 2 to 10mm.

Preferably, the first leg length is 2 to 4 times the second leg length.

More preferably, the first leg is 3.5mm in length and the second leg is 1mm in length.

Preferably, the bone nail is made of stainless steel, titanium alloy or pure titanium.

Preferably, the cross section of the bone nail is circular or oval or D-shaped.

The utility model discloses a beneficial effect of pressurization bone nail: the whole pressurizing bone nail is in a rigid and square design, can pressurize bones at a fracture part for a long time, enables bone sections to be in close contact with each other, and has good stability after operation. Meanwhile, the structure of the pressurizing bone nail is very simple, the operation is very simple and convenient during use, and the bone at the fracture can be pressurized only by inserting the two nail legs of the pressurizing bone nail into the pre-drilled holes at the two sides of the fracture line and pressing the bending part.

Drawings

FIG. 1 is a schematic view of the pressurized bone screw according to the present invention;

FIG. 2 is a front view of the compression bone screw of the present invention;

FIG. 3 is a top view of FIG. 2;

fig. 4 is a view showing the state of the compression bone screw of the present invention.

In the figure, 1 bone nail, 2 bends, 3 first legs, 4 second legs, 5 first fractured bones, 6 second fractured bones, 7 first holes, 8 second holes, 9 bone cracks, 10 free ends of the first legs, 11 free ends of the second legs, 12 cortical bones and 13 cancellous bones.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the bone nail of the present invention is further described in detail by the following embodiments in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments and are not intended to limit the invention.

As shown in FIG. 4, the human bone is divided into cortical bone 12 and cancellous bone 13 from the outside and inside. The cortical bone has compact bone tissue, hard bone quality and better tensile and compressive strength; cancellous bone has loose bone tissue, soft bone and poor tensile and compressive strength.

As shown in fig. 1 to 3, the compression bone nail 1 of the present embodiment is used for treating bone fracture, and is made of titanium alloy, and includes: the bone nail comprises a bending part 2, a first nail leg 3 and a second nail leg 4, wherein the bending part 2 is made into an inelastic circular arc, so that the whole bone nail 1 has no elasticity, the radius of the circular arc is 2-10 mm, bone nails with different circular arc radii can be selected according to the size requirement of a bone at a fracture part, and the radius of the circular arc is 3mm; a first nail leg 3 is formed by extending a certain length from one end of the bending part 2; a second nail leg 4 is formed by extending a certain length from the other end of the bending part 2, the length of the second nail leg is smaller than that of the first nail leg 3, the length of the first nail leg is determined according to the thickness of the diaphysis, the length of the first nail leg cannot exceed the radial cross section of the diaphysis, the length of the second nail leg is larger than the thickness of the cortical bone 12, the length of the first nail leg 3 is 2-4 times that of the second nail leg 4, the length of the second nail leg is 1mm in the embodiment, and the length of the first nail leg is 3.5mm; the axis of the first leg 3 along its length intersects the axis of the second leg 4 along its length at an angle alpha of 5-15 deg., preferably 7.6 deg., on the convex side of the bend 2. The bone nail is integrally designed into a rigid and square hook shape, which is beneficial to pressurization between bones at a fracture part, and is also integrally designed into a rigid structure, which is beneficial to keeping close contact of bone sections for a long time after the bone nail is implanted, and has good stability after operation.

As shown in fig. 4, during the operation, holes are pre-drilled on both sides of the fracture line at the fracture, namely a hole I7 which is substantially vertical to the bone surface is pre-drilled on the first fracture 5, and a hole II 8 which is substantially vertical to the bone surface is pre-drilled on the second fracture 6. Firstly, the first longer nail leg 3 is inserted into the first hole 7 to fix the position of the bone nail 1, the second shorter nail leg 4 of the bone nail 1 is also inserted into the second hole 8, the distance between the bone surface under the bone nail 1 and the bending part 2 is closer and closer along with the drilling of the two nail legs of the bone nail 1 into the bone, namely, the distance between the two nail legs on the bone surface is smaller and smaller, at the moment, the second shorter nail leg 4 penetrates through the cortical bone 12 to drive the second fractured bone 6 to approach to the first nail leg 3, and therefore the bone fracture 9 between the first fractured bone 5 and the second fractured bone 6 is smaller and smaller until the bone fracture surface is pressurized. According to the needs of the thickness of the diaphysis and the size of the bone section, a plurality of bone nails 1 of the embodiment can be arranged at the fracture part.

To facilitate the insertion of the legs into the pre-drilled holes in the fracture, at least one of the free ends 10, 11 of the first leg and the second leg is pointed, in this embodiment both the free end 10 of the first leg and the free end 11 of the second leg are pointed. The tip can be a tip formed by a triangular ridge or a tip formed by a cone or a tip formed by a slope.

It should be noted that at least one end face of the free end of the first nail leg and the free end of the second nail leg is designed to be an arc surface, the arc surface is also favorable for the nail legs to be inserted into the pre-drilled holes, and the arc surface can be a curved surface formed by an arc or a curved surface formed by a non-arc.

In this embodiment, the bone nail 1 is integrally formed, and the integrally formed bone nail 1 has better mechanical strength. Stainless steel or pure titanium can also be used as another material.

In order to make the bone nail more fit to the bone surface and reduce the stimulation of the bone nail to soft tissues, the bent part, the first nail leg and the second nail leg are circular or elliptical or D-shaped in cross section. Wherein, the straight-side plane of the D shape is positioned at the inner side of the bone nail 1, and the curved surface formed by the arc side is contacted with the soft tissue. In this embodiment, they are preferably circular in cross-section with a radius of 2.5mm.

In summary, the above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A compression bone screw for treating a fracture of a shaft, comprising:

a curved portion configured as an inelastic circular arc;

a first leg extending from one end of the bent portion by a predetermined length; and

a second leg extending from the other end of the bending portion by a length less than the length of the first leg;

the axis of the first leg along its length intersects the axis of the second leg along its length at an angle a to one side of the convex surface of the bend.

2. The bone nail according to claim 1, characterized in that said intersection angle α is comprised between 5 ° and 15 °.

3. The bone nail according to claim 2, characterized in that said intersection angle α is 7.6 °.

4. The bone nail of claim 1, wherein at least one of the free ends of the first leg and the second leg is pointed.

5. The bone nail of claim 1, wherein at least one end surface of the free end of the first leg and the second leg is arcuate.

6. The bone nail of claim 1, wherein the arc radius is 2-10 mm.

7. The bone nail of claim 1, wherein the first leg length is 2-4 times the second leg length.

8. The bone nail of claim 7, wherein the first leg is 3.5mm in length and the second leg is 1mm in length.

9. Bone nail according to any of claims 1 to 8, characterized in that it is of stainless steel or titanium alloy or pure titanium.

10. Bone nail according to any of claims 1 to 8, characterized in that it has a circular or oval or "D" shaped cross section.

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