摘要:
The invention relates to an intra-osseous implant for introducing into a bone. The surface of the inventive implant has a specific roughness and comprises recesses (1) of a depth (c) of approximately 20 νm to approximately 60 νm. Bottom surfaces (2) are situated at the base of the recesses (1) and plateau surfaces (3) are located between the recesses (1). Said bottom surfaces (2) and plateau surfaces (3) have a horizontal extension (a, b) of approximately 10 νm to approximately 20 νm. These recesses (1) are ideally as smooth as possible, i.e. they do not show any surface roughness smaller than the cellular dimension. Side faces (4) extending from the bottom surface (2) extend up to the plateau surfaces (3) at an angle, the angle (α) of inclination between the horizontal lines and the side faces (4) being equal to approximately 30° at the most. The implant is provided with a self-tapping thread underneath its upper neck portion, said neck portion being coated with a porcelain-type covering. The surface energy and potential of the implant are kept as low as possible. The preferred materials for producing such implants include titanium, titanium based alloys and porcelain type materials. As a result of this surface structure, the implant is characterised by strong primary stability immediately after implantation and by accelerated and increased capacity due to more intensive osseous integration.
摘要:
The invention provides hard, wear resistant, biocompatible and blood compatible coatings for components of ventricular assist (Figs. 5A-5B), external mechanical heart and blood flow assist devices and total heart implants (Figs. 1-4B) that are exposed to conditions of wear in the body and that may be exposed to blood components. The components are fabricated from zirconium or the alloys of zirconium and the coatings comprise either blue-black or black zirconium oxide or zirconium nitride that are tightly adhered to the underlying metal substrate. In the event that the component is used under conditions which subject it to wear, then the coating should have a thickness that provides sufficient residual compressive stresses to withstand these conditions.
摘要:
A joint prosthesis, such as an artificial hip joint, comprises a first component and a second component, the articulating surfaces of the two components being formed from a cobalt chromium alloy. The alloy of one of the articulating surfaces has less than 0.1% carbon by weight, while the other comprises at least 0.18% carbon by weight.
摘要:
A prosthesis is provided having at least a smooth non-articulating load bearing surface disposed adjacent a bone. The prosthesis includes a substrate formed from a metallic alloy. At least the regions of the substrate defining the load bearing surface are coated with a biologically inert abrasion resistant material harder than the substrate for preventing leaching of ions from the substrate into adjacent body tissue and for preventing wear. The coating may be titanium nitride or zirconium or other such material exhibiting biological inertness and acceptable hardness. The coating preferably defines a thickness of 8-10 microns.
摘要:
The invention provides an interpositional coupler for inserting between modules of a modular medical implant, wherein the modules are fabricated of compositions having different electrochemical potentials, to reduce or prevent the flow of a galvanic current and thereby reducing or preventing this contribution to corrosion of the prosthesis. The coupler may be of an insulative type comprising a zirconium/zirconium alloy core coated with blue-black zirconium oxide or nitride or any metal coated with amorphous diamond-like carbon. Alternatively, the coupler may be of a dual composition type with each of the compositions having essentially the same electrochemical potential as the module to which it couples.
摘要:
A joint prothesis comprises a first component (11), a second component (17) and a plastics sleeve (13) lying between the first and second components. The second component (17), together with the sleeve (13) is an interference fit within a blind bore in the first component (11), to key the first and second components together.
摘要:
An orthotopic artificial bladder endoprosthesis comprises a casing (2) made of a PGA fiber fabric; said casing (2) having two first connectors (3) for the connection with the ureters of a patient and a second connector (4) for the connection with the urethra of a patient; a support element (5) being inserted in said casing (2); said support element (5) being switchable between an extended configuration, in which it supports and maintains in position the casing (2), and a retracted configuration.
摘要:
The invention relates to an intra-osseous implant for introducing into a bone. The surface of the inventive implant has a specific roughness and comprises recesses (1) of a depth (c) of approximately 20 νm to approximately 60 νm. Bottom surfaces (2) are situated at the base of the recesses (1) and plateau surfaces (3) are located between the recesses (1). Said bottom surfaces (2) and plateau surfaces (3) have a horizontal extension (a, b) of approximately 10 νm to approximately 20 νm. These recesses (1) are ideally as smooth as possible, i.e. they do not show any surface roughness smaller than the cellular dimension. Side faces (4) extending from the bottom surface (2) extend up to the plateau surfaces (3) at an angle, the angle (α) of inclination between the horizontal lines and the side faces (4) being equal to approximately 30° at the most. The implant is provided with a self-tapping thread underneath its upper neck portion, said neck portion being coated with a porcelain-type covering. The surface energy and potential of the implant are kept as low as possible. The preferred materials for producing such implants include titanium, titanium based alloys and porcelain type materials. As a result of this surface structure, the implant is characterised by strong primary stability immediately after implantation and by accelerated and increased capacity due to more intensive osseous integration.
摘要:
A device (2) is disclosed for introducing a flexible elongated element through at least two portions of a subject. In a preferred embodiment, the device includes a proximal end and a distal end, and an advancement unit (300) for longitudinally advancing the flexible elongated element toward the distal end of the device (2) such that a proximal end of the elongated element may exit from the distal end of the device with sufficient force to pass through the subject. The device also includes a curved die (204) at the distal end of the device (2) for imparting a looping configuration to portions of the flexible elongated element exiting the distal end of the device (2), and a curved guide at the distal end for receiving the looped flexible elongated element as it returns to the distal end of the device. In a further feature of the invention, a cutting mechanism (206) is provided to permit the looped flexible elongated element to be separated from the remainder of the flexible elongated element. And in a further feature of the invention, the cutting mechanism (206) is adapted to deform the trailing end of the looped flexible elongated element so that the trailing end is forced distally, toward the subject being sutured.