Description:FIELD OF THE INVENTION
This invention relates to Implement of small multilayered porous bearing in knee joint for improving the stress transfer and lubrication
BACKGROUND OF THE INVENTION
In knee joint, articular cartilage (AC) is the bearing surface with low friction and wear in freely moving synovial joints that permits smooth motion between adjoining bo multilayered porous bearing for use in a knee joint prosthesis, comprising:ny segments. Because of its compliance, AC helps to distribute the loads between opposing bones in a synovial joint. The entire joint is enclosed in a fibrous tissue capsule, the inner surface of which is lined with the synovial membrane that secretes a fluid known as synovial fluid. Synovial fluid is essentially a dialysate of blood plasma with added hyaluronic acid. In a common synovial joint, less than 1mL synovial fluid is present. Synovial fluid is a thick, stringy fluid. With its egg-like consistency synovial fluid reduces friction in the AC of synovial joints to lubricate and cushion them during movement.
Now a days knee joint problems are very common disease among the human beings specially in old age group due to the rheumatoid arthritis, post-traumatic arthritis, knee deformity, trauma or injury etc. Due to insufficient amount of synovial fluid in the joint, joint bone will undergo high friction and the stress also not properly transfer and distributed. Person can feel heavy pain and mobility of the joint also restricted. It is observed that total joint replacements are a common treatment for people who have trouble moving and feel pain because of severe joint damage. One of the main reasons for follow-up surgeries is a problem called aseptic loosening, which happens when the implant doesn’t match the bone’s properties, leading to uneven stress. To fix this issue, researchers are looking for ways to make implants less stiff. mechanical object, adding tiny holes (porosity) to implant materials that will give better lubrication property and reduce stiffness significantly. So, it is time to implement such type of mechanical component that fulfill this demand. For this purpose, multilayered small porous bearing is suitable as it poses good lubrication as well as less stiffness and handle the joint stress in effective way. It also poses inherent damping property against jerk or vibration.
Porous material for knee joint is in development phase in various research groups. They are used to composite metallic plate for the treatment of knee joint. Till date there is no utilization of multilayered small porous bearing to reduce stress and stiffness of the replaced knee joint.
It is observed that total joint replacements are a common treatment for people who have trouble moving and feel pain because of severe joint damage. One of the main reasons for follow-up surgeries is a problem called aseptic loosening, which happens when the implant doesn’t match the bone’s properties, leading to uneven stress. To fix this issue, researchers are looking for ways to make implants less stiff. mechanical object, adding tiny holes (porosity) to implant materials that will give better lubrication property and reduce stiffness significantly. In present day whatever the material or object used in knee joint replacement they are not capable of self-lubricating property as well as stiffer. So, the uneven stress distribution arises the pain after joint replacement.
Till date there has been no commercial application of multilayered porous bearing in knee joint to avoid aseptic loosening. The present invention utilizes the capability of multilayered porous bearing, consisting of fine and coarse layer, to element aseptic losing problem. The proposed invention differs from the previous solutions in terms of inherent damping property, self-lubricating property, even stress distribution in the knee joint as well as less stiffness in the knee joint. In previous solutions, after knee replacement improper stress distribution in the knee joint creates pain and high stiffness hamper the mobility of the joint. Present invention will eliminate both problems and provides a better human life after knee joint replacement.
SUMMARY OF THE INVENTION
This summary is provided to introduce a selection of concepts, in a simplified format, that are further described in the detailed description of the invention.
This summary is neither intended to identify key or essential inventive concepts of the invention and nor is it intended for determining the scope of the invention.
To further clarify advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.
As per problem defined, main problems are uneven stress distribution in knee joints after knee replacement, improper lubrication, high stiff joint.
In present invention, inserting multilayered small porous bearing to eliminate the above problems. In multilayer porous bearings addition of pockets and grooves on the bushing increases the internal volume of bearings and leads to an increase in compensation delay to a change in load. There is a more elegant way of distributing the fluid (here synovial fluid) more uniformly by diffusing the fluid through a porous bearing face. Since, most of the porous materials possess a myriad of tiny and tortuous passages, the external pressurization results in a bearing with a large number of restrictors. Flow of fluid through a large number of pores causes to bleed even pressure from the porous surface, resulting in a better stress distribution in the clearance of joint and proper stress transformation.
Multilayered porous bearing also enhancing stability and possess better radial load- carrying capacity of the knee joint because it is already proved that in multilayered porous bearing thin layer of surface with high restriction to flow backed by a high permeable coarse grain porous layer can enhance the load capacity. Such kind of configuration would provide flexibility for the designer to optimize the geometry of fine layers with low permeability to ensure major pressure drop and simultaneously to design the coarse layers to gratify the structural requirements. It is possible to control the fluid flow through the multilayered structure such that over 90–95% of the pressure drop occurs across the thin fine layers, even with its thickness of only 5–10% of the coarse layers.
So, in this way, this invention can provide better stress distribution, proper lubrication in knee joint and make the joint less stiff. such that mobility of the joint should increase.
BRIEF DESCRIPTION OF THE DRAWINGS
The illustrated embodiments of the subject matter will be understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and methods that are consistent with the subject matter as claimed herein, wherein:
FIGURE 1: Schematic configuration of multilayered porous bearing
FIGURE 2: Bearing Inserting Position
The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION OF THE INVENTION
The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure as defined by the appended claims.
It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a",” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises,” “comprising,” “includes” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
In addition, the descriptions of "first", "second", “third”, and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include at least one of the features, either explicitly or implicitly.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As per problem defined, main problems are uneven stress distribution in knee joints after knee replacement, improper lubrication, high stiff joint.
In present invention, inserting multilayered small porous bearing to eliminate the above problems. In multilayer porous bearings addition of pockets and grooves on the bushing increases the internal volume of bearings and leads to an increase in compensation delay to a change in load. There is a more elegant way of distributing the fluid (here synovial fluid) more uniformly by diffusing the fluid through a porous bearing face. Since, most of the porous materials possess a myriad of tiny and tortuous passages, the external pressurization results in a bearing with a large number of restrictors. Flow of fluid through a large number of pores causes to bleed even pressure from the porous surface, resulting in a better stress distribution in the clearance of joint and proper stress transformation.
Multilayered porous bearing also enhancing stability and possess better radial load- carrying capacity of the knee joint because it is already proved that in multilayered porous bearing thin layer of surface with high restriction to flow backed by a high permeable coarse grain porous layer can enhance the load capacity. Such kind of configuration would provide flexibility for the designer to optimize the geometry of fine layers with low permeability to ensure major pressure drop and simultaneously to design the coarse layers to gratify the structural requirements. It is possible to control the fluid flow through the multilayered structure such that over 90–95% of the pressure drop occurs across the thin fine layers, even with its thickness of only 5–10% of the coarse layers.
So, in this way, this invention can provide better stress distribution, proper lubrication in knee joint and make the joint less stiff. such that mobility of the joint should increase.
NOVELTY:
Use of multilayered porous bearing in knee joint provides better stress distribution, proper lubrication in knee joint and make the joint less stiff. such that mobility of the joint should increase.
In the above figure, supply port will be feed synovial fluid in between the journal (knee bone) and the multilayer porous surfaces. When the movement of the knee happened i.e. movement of the knee bone, pores of the porous layer automatically feed the lubricant in between the bones and porous cushion pad. That phenomenon helps to increase mobility of the joint, reduce stiffness of the joint as well as proper stress distribution and propagation through porous cushion bearing.
Below diagrams show the inserting position of the multilayered porous bearing in the knee joint.
 
, Claims:1. A multilayered porous bearing for use in knee joint prostheses, comprising: a plurality of micro-pores, grooves and pockets.
2. A system as claimed in claim 1, wherein the surface layer formed of a fine porous material having low permeability and high resistance to fluid flow.
3. A system as claimed in claim 1, wherein the backing layer formed of a coarse porous material having high permeability and structural rigidity.
4. A system as claimed in claim 1, wherein the plurality of micro-pores distributed across the bearing face configured to allow uniform diffusion of synovial fluid under pressure.
5. A system as claimed in claim 1, wherein the one or more grooves or pockets integrated into the bushing geometry to increase internal fluid volume and modulate load compensation delay.
6. A system as claimed in claim 1, wherein the wherein the bearing is structured such that over 90–95% of the pressure drop occurs across the surface layer,
thereby providing improved stress distribution, enhanced lubrication, and increased mobility in the knee joint.