MX2012014802A - Interconnectable bone blocks for prosthesis. - Google Patents

Abstract

The method for manufacturing interconnectable bone blocks for prosthesis includes the use of human femoral bone in inert state as raw material obtained from a shaft with the purpose of being subsequently used in the manufacture of orthoses that fulfill the needs to cover different pathologies and provide service to companies, hospitals and surgeons that require this type of material. The present invention pertains to the technical field of methods for manufacturing interconnected bone blocks using the cortical part of the human femoral bone in inert state as a material, which is subsequently used in the manufacture of novel prostheses for orthopedic treatments as a novel product for patients with different pathologies. The current market has no product similar to the interconnected bone blocks, therefore the invention being intended to innovate by introducing a novel product useful in companies, hospitals and surgeons that require this type of materials, which provide a better quality of life to the users that need this type of prosthesis.

Description

INTERCONECTABLE BONE BLOCKS FOR PROTESIS DESCRIPTION OBJECT OF THE INVENTION The object of this invention is to provide a manufacturing method for making blocks of cortical bone using as a material the human femoral bone in an inert state to be used in the manufacture of orthotics as a new product at the service of companies, hospitals and surgeons that require this type of materials.

BACKGROUND In the patent application US 2001/0041941 Al, US 2002/0029084 Al and US 7,087,082 B2 that specify the creation of blocks composed of two or more fragments to form a single unit. The cortical bone or cancellous bone is removed from its origin to be stylized with desirable shapes and sizes. The components obtained from bone can be integrated into the predesigned implants for the human body. The bone structure can be formed by the combination of sections of several bones and also this can be stylized with shapes, particular geometries and sizes for the purpose of being used for the manufacture of implants. In comparison, the proposed interconnectable bone block is fabricated solely from the cortical and human bone portions; It can also be used for various treatments.

In the patent application US 7,323,011 B2 a block composed of cortical and spongy bone tissue that serves as a cervical spacer is pointed out. This union is made by a "T" shape in the part composed of cortical bone coupled to a part of cancellous bone. The "T" shaped crosspiece defines a flat interior surface and the dovetail coupling member extends outwardly from the inner flat surface In comparison, the proposed interconnectable bone block is fabricated solely from the cortical part and human bone; It can also be used for lumbar treatments.

In the patent application US2007 / 0208423 to which a compound block which is used as an implant for Transforaminal Lumbar Intersomatic Fusion Procedure (TLIF) is described, and describes a curved body substantially formed of at least two parts of bone tissue, with toothed surfaces in the form of a pyramid to be placed between the 1st and 2nd vertebrae, with at least one channel without horizontal thread that is adapted for the insertion of the tool and includes at least one radiopaque marker, either pins or screws. However, this presents the limitation that can only be placed in a small number of vertebrae and also includes that this implant can be made of Titanium or Plastic. In comparison, the block of interconnectable bone proposed has the advantage that the block can be given a final final form so that it can be used in the vertebrae corresponding to the lero place to the 5th instead of limiting only the 1st and 2nd vertebra that delimits as a scope for this implant, besides that a radiopaque marker is not required.

In the patent application US Pat. No. 6,398.81 1B1 specifying an intervertebral spacer composed of bone tissue of long cortical bone that includes a morphogenic protein, comprising a polymer whose function is to serve as a reinforcing material or to fill an empty space and is limited to have a cylindrical shape. In comparison, the block of interconnectable bone proposed has the advantage that the block can be given a form posterior end so that it can be used in various uses and is composed entirely of human cortical bone.

In patent application US 7,018,413 B2 specifying a modular cortical bone bone spacer system that has a coupling system at one end of the body and with an extensive amount of extensions that fit the coupling system of the first body. In comparison, the block of interconnectable bone proposed has the advantage that the block can be given a final final shape so that it can be used in various uses and is composed entirely of human cortical bone.

In the patent application 5,899,939 which specifies the creation of blocks for implants derived from bone tissue through the superposition of several layers of cortical bone tissue unit by an adhesive. In comparison, the proposed interconnectable bone block is formed of at least two parts of cortical human bone, and does not use adhesives.

In the patent application US Pat. No. 6,458,158 Bl and US Pat. No. 6,200,347 Bl that specify a block composed of bone tissue that includes two or more portions of bone in addition to a biocompatible connector with which it supports the structure and forms the reinforced block. This block includes one or more textured bone surfaces. In comparison, the block of interconnectable bone proposed has the advantage that the block can be given a final final shape so that it can be used in various uses and is entirely composed of cortical human bone, besides that it does not use biocompatible connectors for its manufacture.

In the patent application 5,152,791 which specifies a block that serves as an artificial bone prosthesis obtained from at least a porous part from 40 to 90% and from at least a less porous part of 50% or less. In comparison, the block of interconnectable bone proposed has the advantage that the block can be given a final final shape so that it can be used in various uses and is composed entirely of cortical human bone in addition to not having high porosity.

In the patent application US 7,347,873 B2 that points out a spacer that is formed of at least two pieces assembled, and is made of composite materials excluding bone tissue. In comparison, the block of interconnectable bone proposed has the advantage that the block can be given a final final shape so that it can be used in various uses and is composed entirely of human cortical bone.

In the patent application 5,314,478 which specifies a prosthesis made of artificial cartilage or artificial intervertebral disc. In comparison, the block of interconnectable bone proposed has the advantage that the block can be given a final final shape so that it can be used in various uses and is composed entirely of human cortical bone.

In the patent application 6,123,731 which specifies an osteoimplant manufactured from a solid accumulation of bone derived elements joined by chemical bonding between their exposed surfaces with collagen surfaces. In comparison, the block of interconnectable bone proposed has the advantage that its assembly is entirely mechanical and is composed entirely of human cortical bone.

In the patent application US 2003/0028197 To which points out procedures of implants, instruments and methods of fusion of cortical tissue. In comparison, the The methodology of the proposed interconnectable bone block has the advantage that its assembly is totally mechanical.

In the patent application US 2003/0105528 To which points a cortical implant formed of a block of at least two bone boards, which are connected with one or more pins of displacement, which can be circular cylinders inserted into holes to avoid displacement. In comparison, the methodology of the interconnectable bone block proposed has the advantage that its assembly is completely mechanical without the need for additional pins, in addition to the fact that the block is composed entirely of human cortical bone.

In the patent application 4,950,296 which specifies a block of cortical bone with an internal cavity that contains spongy bone in its entirety. In comparison, the block of interconnectable bone proposed has the advantage that the block can be given a final final shape so that it can be used in various uses and is composed entirely of human cortical bone.

BRIEF DESCRIPTION OF THE FIGURES Figure 1. Bone with cortical tissue in inert state without spongy tissue.

Figure 2. Isometric view of the piece of bone cut.

Figure 3. Top view of the block with male assembly geometry.

Figure 4. Top view of the block with female assembly geometry.

Figure 5. Top view of the assembled block and with interior spaces.

Figure 6. Isometric view of the assembled block, with interior spaces and rectified until obtaining flat faces in its 6 sides.

DETAILED DESCRIPTION OF THE INVENTION The present invention pertains to the technical field of methods for manufacturing interconnected bone blocks using as a material the cortical part of the human femoral bone in an inert state for later use in the manufacture of new prostheses used for orthopedic treatments as a new product at the service of patients with various pathologies Currently there is no product on the market similar to the blocks of interconnected bone, so it is intended to make innovations that introduce a new product at the service of companies, hospitals and surgeons that require this type of material.

In particular, the manufacturing method for the construction of interconnected bone blocks using the cortical bone of a human femur in the inert state as a material is integrated by the following steps: 1. TRANSVERSAL BONE CUT. This stage begins by placing a bone with only cortical tissue in an inert state, and without the spongy tissue (hollow No. 1, which is seen in Figure 1) in a cutter to make a cut in a longitudinal direction taking as reference the face with greater thickness in such a way that when done, at least 2 pieces with a wide cross-sectional area (No 2) are obtained, as can be seen in Figure 2. This operation can be done in a disc cutter or any other machine that allows us to make a fine and straight cut. At the end of this stage, at least two pieces of bone will be obtained.

MACHINING THE BONE SURFACE. This stage begins by placing the piece (s) obtained in the previous process in a machining center by means of some special fastening system in such a way that the inner faces (No 3) are exposed to one side. By having the piece (s) assembled in the indicated position, a material removal with special cutting tools is carried out until obtaining the assembly characteristics that are made based on at least one dovetail assembly ( No 4 and No 5) as can be seen in Figure 3 and Figure 4. This step can be done on both sides of the pieces obtained in the previous step if it is desired to join the block composed of at least 2 pieces. This operation can be carried out in any machining center that can perform fine and precise movements, or also in micro-milling centers.

ASSEMBLY OF BONE PIECES WITH AT LEAST ONE MACHINEED FACE WITH ASSEMBLY CHARACTERISTICS. In this stage the faces that were machined with the assembly characteristics (No 4 and No 5) are assembled by manual pressure through their faces with this shape to obtain a assembly of at least two pieces and with interior spaces (No. 6) as can be seen in Figure 5. 4. BLOCK DEVASSE OF BONE ASSEMBLED. This stage begins by placing the ovoid block of assembled bone obtained in the previous step in a machining center by means of some special clamping system or press so that one of the faces where the assembly is seen (No. 7) is exposed upwards. In this operation, the material from the assembled bone ovoid is removed until it has a rectangular shape on the sides of the assembled block (No 8) perceived from the top view, trying to make the most of its volume as can be seen in Figure 6. This step can be done at any machining center.

In what refers to the block of interconnected bone we have to: 1. It is manufactured from cortical bone (hard bone) of the human femur, especially the femoral diaphysis, without distinction of age, sex structure or feeding the donor in life, these are provided by cadaveric donors. 2. It is composed of at least two components which will be assembled together without any binder or adhesion chemical. 3. The assemblies are made in compliance with the principles of dovetail assembly and assembly with interference. 4. When made from human bone, it can be detected by fluoroscopy and X-rays. 5. An assembled block is obtained that has interior spaces which will later serve to contain bone cement with the function of greater osseointegration.

In particular, an example of the manufacturing method for the construction of intervertebral spacers using human femoral bone in inert state as a material will be presented: 1. TRANSVERSAL BONE CUT. This stage begins by placing a femoral diaphysis which is a bone with only cortical tissue in an inert state, and without the spongy tissue (hollow No. 1, which is seen in Figure 1), in a cutter, taking as an example the one that is used that is STRUERS brand, required to make a cut in a longitudinal direction taking as reference the face with greater thickness so that when done you get at least 2 pieces with wide cross-sectional area (No 2) as can be seen in Figure 2. At the end of this stage, at least two pieces of bone will be obtained. 2. MACHINING THE BONE SURFACE. This stage begins by placing the pieces obtained in the previous process inside the MAKINO S56 with the URT press in such a way that the inner faces (No 3) are exposed to one side. By having the pieces assembled in this position, we proceed to machining with cutting tools of 1/32 and 1.5 in diameter until obtaining the assembly characteristics that are made based on the dovetail assembly (No 4 and No 5) as can be done. appreciate in Figure 3 and in Figure 4. 3. ASSEMBLY OF BONE PIECES WITH AT LEAST ONE MACHINEED FACE WITH ASSEMBLY CHARACTERISTICS. In this stage assemble the faces that were careadas and machined with the characteristics of assembly (No 4 and No 5) to manual pressure through their faces with this form to obtain a single piece of at least two pieces and with interior spaces (No. 6) as can be seen in Figure 5.

BLOCK DEVASSE OF BONE ASSEMBLED. This stage begins by placing the ovoid block of assembled bone obtained in the previous step in a machining center by means of some special clamping system or press so that one of the faces where the assembly is seen (No. 7) is exposed upwards. In this operation, the material of the assembled bone ovoid is removed until it has a rectangular shape on the sides of the assembled block (No 8) perceived from the top view, trying to take full advantage of the volume of it as can be seen in Figure 6. This step is done with a ½ diameter tool.

Claims (5)

CLAIMS Having described my invention enough, I consider it as a novelty and therefore claim as my exclusive property, what is contained in the following clauses:

1. It is manufactured from cortical bone (hard bone) of the human femur, especially the femoral diaphysis, without distinction of age, sex structure or feeding the donor in life, these are provided by cadaveric donors.

2. It is composed of at least two components which will be assembled together without any adhesion binder or chemical.

3. The assemblies are made in compliance with the principles of dovetail assembly and assembly with interference.

4. The final block contains spaces destined to be filled with bone cement used in various operations

5. When made from human bone, it can be detected by fluoroscopy and X-rays.