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Publication Number
US-11612486-B2
Publication Date
2023-03-28
Expiration Date
Abstract
A prosthesis for at least a portion of a bone, in particular a bone or portion thereof to which, in the natural condition, a tendon of a muscle is attached, wherein the prosthesis is manufactured of a metal or an alloy thereof and is provided with at least one area situated in the surface of the prosthesis that faces outward once the prosthesis has been placed in the body, the area being formed by a layer provided with open spaces that are connected to each other, wherein the open spaces are dimensioned for allowing the growth of bone tissue therein.
Core Innovation
The document discloses a metal or alloy prosthesis for at least a portion of a bone, including a bone to which a tendon of a muscle is attached in the natural condition. The prosthesis has at least one outward-facing surface area formed by a layer of material with interconnected open spaces that form a porous area, where the open spaces are dimensioned to allow the growth of bone tissue therein. The porous area is a local area at the outer surface and is surrounded by outer-surface surfaces that are without pores and are smooth surfaces.
The prosthesis is designed as a mandibular-side prosthesis for a temporomandibular joint. The porous area can be formed by an architecture such as a rib/bar scaffold or a crisscross system of short channels, and is described as being composed of interconnected open spaces. Quantitative ranges for the open spaces and porous layer are described, including open-space cross-section dimensions and porosity, and optional coatings are described for the prosthesis surfaces.
The document further describes accommodating the original tendon enthesis and tendon engagement with the prosthesis porous area, including an accommodation/groove/tunnel feature for at least temporary tendon securing. In a described arrangement for TMJ, a tendon with its original enthesis including a bone fragment is detached and then positioned such that it engages the porous areas, and bone formation is promoted in the open spaces by bone healing. The bone fragment is described as being able to attach to bone tissue formed in the pores, and optional growth factors and/or stem cells are described as being used in or with the open spaces.
Claims Coverage
The independent claims cover a metal or alloy mandibular temporomandibular joint prosthesis with a localized porous outward surface area and a method for arranging the prosthesis with tendon and bone-fragment engagement. Each independent claim includes the porous area formed by interconnected open spaces dimensioned for bone tissue growth and surrounded by smooth, pore-free outer-surface surfaces; the method claim further includes tendon detachment, prosthesis positioning, temporary tendon securing on engagement with the porous areas, and promoting bone formation so the bone fragment attaches to bone tissue formed in the pores.
Metal or alloy mandibular TMJ prosthesis with localized porous outer area
A prosthesis manufactured of a metal or of an alloy thereof, designed as a mandibular-side prosthesis of a temporomandibular joint, including at least one outward-facing surface area formed by a layer of material provided with interconnected open spaces forming a porous area, where the open spaces are dimensioned for allowing growth of bone tissue therein and the porous area is a local area surrounded by outer-surface smooth, pore-free surfaces.
Arranging a mandibular TMJ prosthesis with tendon enthesis engagement on porous area
A method comprising detaching tendons from the bone area to be replaced and removing the bone area, positioning the prosthesis at the wanted location, at least temporarily securing tendons with their original enthesis in a bone fragment on the prosthesis in engagement with the porous areas, and promoting formation of bone tissue in the open spaces so the bone fragment attaches to bone tissue formed in the pores, where the prosthesis includes a head part replacing the condylar head and an attachment plate with a condylar neck connecting them, and the porous area is provided on the condylar neck.
Overall, claim coverage is centered on a metal or alloy mandibular TMJ prosthesis having a local outward porous area defined by interconnected open spaces dimensioned for bone tissue growth, surrounded by smooth non-porous outer surfaces, and on a method for arranging such a prosthesis in which detached tendons with original enthesis including a bone fragment are temporarily secured in engagement with the porous areas and bone healing promotes bone tissue formation so the bone fragment attaches to the bone tissue formed in the pores.
Stated Advantages
Documented Applications
No documented applications found
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