CN106726014B - Artificial bone cushion block for handling dome sample acetabular bone defect - Google Patents

Abstract

The invention discloses an artificial bone pad for treating dome-like acetabular bone defect, which comprises a pad body, at least one screw hole reservation structure located on the pad body, and a structure arranged in the screw hole. Reserving a groove on the outer periphery of the structure; the cross-sectional shape of the spacer body passing through the middle of its thickness is circular, and the thickness of the spacer body gradually decreases from the center of the circle to the circumference; the spacer body There are several first absorption holes on the body, and several second absorption holes are opened on the screw hole reserved structure, the density of the first absorption holes is lower than the density of the second absorption holes, and the density of the first absorption holes is The pore size is smaller than the pore size of the second absorption hole. The artificial bone pad can reduce the difficulty of nailing while ensuring the structural strength of the artificial bone pad and the bone healing effect, and at the same time improve the positional accuracy and structural stability of the screw.

Description

Artificial bone spacer for treating dome-like acetabular bone defect

technical field

The invention belongs to the technical field of medical appliances, and in particular relates to an artificial bone pad for treating dome-shaped acetabular bone defects.

Background technique

Artificial bone is an artificial biomaterial that can replace human bone or repair bone tissue defects, and is widely used in modern orthopedic medicine. The management of bone defects is the most common problem in arthroplasty revision. Artificial bone spacer bone graft has the potential of occupying space, osteoinduction, and bone replacement. It can not only provide mechanical stability in the early stage of use, but also gradually complete bone growth replacement in the later stage to achieve the effect of biological fixation and reconstruction. In recent years, various new artificial bone blocks have been favored by orthopedic surgeons in the treatment of bone defects. However, the existing absorbable artificial bone pads have problems such as weak structural strength, uncontrollable absorption speed, and difficulty in implanting screws through the artificial bone. If the artificial bone cushion is absorbed too early, the local strength will drop rapidly, and the new bone will not have time to crawl and replace, which will easily lead to weak local strength; if the artificial bone cushion is absorbed too slowly, it will prevent the new bone from crawling and replacing, and it will not Good for bone healing. Especially in the treatment of dome-like acetabular bone defects, due to the need for nailing and the limitation of space shape and other factors, the requirements for artificial bone spacers are more special.

Therefore, an artificial bone block for treating dome-like acetabular bone defects is provided, in order to reduce the difficulty of nailing and improve the positional accuracy of the screws on the premise of ensuring the structural strength of the artificial bone block and the bone healing effect And structural stability, just become the problem to be solved urgently by those skilled in the art.

Contents of the invention

The present invention aims to provide an artificial bone block for treating dome-shaped acetabular bone defect, in order to reduce the difficulty of nailing and improve the position of the screw on the premise of ensuring the structural strength of the artificial bone block and the bone healing effect accuracy and structural stability.

In order to achieve the above purpose, the artificial bone pad for treating dome-like acetabular bone defect provided by the present invention includes a pad body, at least one screw hole reservation structure located on the pad body, and a structure arranged on the pad body. The screw holes reserve the grooves on the outer periphery of the structure; the cross-sectional shape of the pad body passing through the middle of its thickness is circular, and the thickness of the pad body gradually decreases from the center of the circle to the circumference; A number of first absorption holes are opened on the pad body, and a number of second absorption holes are opened on the screw hole reserved structure, the density of the first absorption holes is lower than the density of the second absorption holes, and the density of the first absorption holes is lower than that of the second absorption holes. The aperture of the first absorption hole is smaller than the aperture of the second absorption hole; the spacer body and the reserved structure of the screw hole are calcium sulfate mixture or calcium phosphate mixture; the reserved structure of the screw hole is a circular structure, The notch is a ring concentrically arranged with the circular structure.

When using artificial bone, the artificial bone with thinner thickness absorbs faster, the thicker one absorbs slowly, the artificial bone with large pore size absorbs quickly, the pore size with small pore size absorbs slowly, and the one with high pore density per unit area absorbs quickly. The lower the pore density, the slower the absorption. Therefore, the diameter of the first absorption hole provided on the main part of the spacer body is smaller than the aperture of the second absorption hole provided on the screw hole predetermined structure, and the density of the first absorption hole is smaller than the density of the second absorption hole, thereby ensuring that the pad The block body has sufficient support strength, and the absorption speed is slow, and at the same time, the strength of the screw hole reserved structure is low, and the absorption speed is fast, and the drill bit is easy to pass through during the drilling operation, and can be cut by the thread of the screw at the same time out of the channel and provide holding force for the screw, reducing the difficulty of nailing operation; in addition, a circular groove mark is prefabricated around the reserved structure of the screw hole. In , when the screw hole reserved structure is blocked or partially blocked, the center of the screw hole reserved structure can be quickly found by following the concentric groove marks, so as to improve the operation convenience and the accuracy of the nailing position. In this way, the artificial bone spacer can reduce the difficulty of nailing while ensuring the structural strength and bone healing effect of the artificial bone spacer, and at the same time improve the positional accuracy and structural stability of the screw.

Further, there are at least two notches, each of which is arranged concentrically, and there is a preset gap between two adjacent notches.

Further, there are two grooves.

Further, the first absorption hole has a pore size of 100 microns to 300 microns, and the second absorption hole has a pore size of 300 microns to 400 microns.

Further, the density of the first absorption holes is 0-150 per square centimeter, and the density of the second absorption holes is 150-200 per square centimeter.

Further, the spacer body is a calcium sulfate mixture, and the screw hole reserved structure is a calcium phosphate mixture.

Further, the number of the screw hole reserved structures is three, and the line connecting the cores of the three screw hole reserved structures forms an equilateral triangle, and the center of the equilateral triangle is in line with the center of the groove. coincide.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the specific embodiments or the prior art.

Fig. 1 is the structural representation of a specific embodiment of the artificial bone spacer provided by the present invention;

Fig. 2 is a sectional view of the artificial bone pad described in Fig. 1;

Fig. 3 is a partial enlarged view of the end face of the artificial bone pad shown in Fig. 2 .

Explanation of reference signs:

1-block body

2- screw hole reserved structure

3-grooving

4-Second absorption hole

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

Please refer to Fig. 1-Fig. 3, Fig. 1 is the structural representation of a specific embodiment of the artificial bone spacer provided by the present invention; Fig. 2 is the sectional view of the artificial bone spacer described in Fig. 1; A partial enlarged view of the end face of the artificial bone spacer is shown.

In a specific embodiment, the artificial bone block for treating dome-like acetabular bone defect provided by the present invention includes a block body 1 and at least one screw hole reservation structure located on the block body 1 2, and the engraved groove 3 arranged on the outer periphery of the screw hole reserved structure 2; the cross-sectional shape of the pad body 1 passing through the middle of its thickness is circular, and the thickness of the pad body 1 is from the The center of the circle gradually shrinks to the circumference; the pad body 1 is provided with a number of first absorption holes (not shown in the figure), and the screw hole reserved structure 2 is provided with a number of second absorption holes 4, so The density of the first absorption hole is smaller than the density of the second absorption hole 4, and the aperture of the first absorption hole is smaller than the aperture of the second absorption hole 4; the spacer body 1 and the screw hole are reserved The structures 2 are calcium sulfate mixture or calcium phosphate mixture; the screw hole reserved structure 2 is a circular structure, and the groove 3 is a ring concentrically arranged with the circular structure.

The structure of the spacer body 1 is a form in which two spherical structures intersect, and the smoothness of the surface needs to be ensured, and the screw hole reserved structure 2 is a circular structure.

The block body 1 and the screw hole reserved structure 2 are calcium sulfate mixture or calcium phosphate mixture. In the artificial bone, calcium carbonate, calcium sulfate, and calcium phosphate can all be its components, and calcium phosphate is absorbed slower than calcium sulfate. , slower than calcium carbonate, the specific composition can be selected according to the actual use requirements.

Therefore, the aperture of the first absorption hole provided on the main part of the spacer body 1 is smaller than the aperture of the second absorption hole 4 provided on the screw hole predetermined structure, and the density of the first absorption hole is smaller than the density of the second absorption hole 4, In this way, it is ensured that the spacer body 1 has sufficient supporting strength and is absorbed slowly, and at the same time, the strength of the screw hole reserved structure 2 is low, and the absorption speed is fast, and the drill bit is easy to pass through during the drilling operation, and at the same time it can The channel is cut out by the thread of the screw and provides holding force for the screw, reducing the difficulty of nailing operation.

In addition, a circular groove 3 mark is prefabricated around the screw hole reserved structure 2, and the groove 3 is concentric with the screw hole reserved structure 2. During the working process, when the screw hole reserved structure 2 is blocked Or when it is partially blocked, you can quickly find the center of the screw hole reserved structure 2 by following the concentric groove 3 mark, so as to improve the convenience of operation and the accuracy of the nailing position. In this way, the artificial bone spacer can reduce the difficulty of nailing while ensuring the structural strength and bone healing effect of the artificial bone spacer, and at the same time improve the positional accuracy and structural stability of the screw.

Further, there are at least two notches 3, and each notch 3 is arranged concentrically, and there is a preset gap between two adjacent notches 3, so as to expand the identification range of notches 3, when the screw hole When the reserved structure 2 is covered by a large area, the center of the circle can also be identified through the notch 3 . Considering the surface space and processing difficulty of the block body 1, there are specifically two engraved grooves 3 .

Specifically, the pore diameter of the first absorption hole is 100 microns-300 microns, the pore diameter of the second absorption hole 4 is 300 microns-400 microns; the density of the first absorption holes is 0-150 per square centimeter , the density of the second absorption holes 4 is 150-200 per square centimeter to ensure the best absorption effect.

In this specific embodiment, the number of the above-mentioned screw hole reserved structures 2 is three, and the line connecting the cores of the three screw hole reserved structures 2 forms an equilateral triangle, and the center of the equilateral triangle is connected to the The centers of circles of the notches 3 coincide to ensure the stability of the pad body 1 after nailing. Theoretically, the screw hole reserved structure 2 is not limited to three, and it can also be provided with two or four, etc. The actual number should be determined according to the use requirements, and is not limited here.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (7)

1. An artificial bone spacer for treating dome-like acetabular bone defect, comprising a spacer body, at least one screw hole reservation structure positioned on the spacer body, the spacer body and the screw hole The reserved structures are all calcium sulfate mixtures or calcium phosphate mixtures, and are characterized in that they also include grooves arranged on the periphery of the reserved structure for the screw holes; The cross-sectional shape of the spacer body in the middle of its thickness is circular, and the thickness of the spacer body gradually decreases from the center of the circle to the circumference; The block body is provided with a number of first absorption holes, and the screw hole reserved structure is provided with a number of second absorption holes, the density of the first absorption holes is lower than the density of the second absorption holes, and the density of the first absorption holes is lower than that of the second absorption holes. the diameter of the first absorption hole is smaller than the diameter of the second absorption hole; The reserved structure for the screw hole is a circular structure, and the groove is a ring concentrically arranged with the circular structure. 2. The artificial bone spacer for treating dome-like acetabular bone defect according to claim 1, characterized in that there are at least two grooves, each of which is arranged concentrically, and two adjacent grooves There is a preset gap between the grooves. 3. The artificial bone spacer for treating dome-shaped acetabular bone defect according to claim 2, characterized in that there are two grooves. 4. The artificial bone pad for treating dome-shaped acetabular bone defect according to claim 1, characterized in that, the aperture of the first absorption hole is 100 microns-300 microns, and the diameter of the second absorption hole The pore size is 300 microns-400 microns. 5. The artificial bone pad for treating dome-shaped acetabular bone defect according to claim 4, characterized in that, the density of the first absorption holes is 0-150 per square centimeter, and the density of the second absorption holes is 0-150 per square centimeter. The density of holes is 150-200 per square centimeter. 6. The artificial bone block for treating dome-like acetabular bone defect according to claim 1, characterized in that, the block body is a calcium sulfate mixture, and the screw hole reserved structure is a calcium phosphate mixture. 7. The artificial bone spacer for treating dome-shaped acetabular bone defect according to any one of claims 1-6, characterized in that, the number of reserved structures for the screw holes is three, and the three The line connecting the cores of the screw hole reserved structure forms an equilateral triangle, and the center of the equilateral triangle coincides with the center of the groove.