A lumen stent preform is provided using a plasma nitriding technology, a preparation method thereof, a method for preparing a lumen stent by using the preform, and a lumen stent obtained according to the method. The preform is manufactured by using pure iron or an iron alloy containing no strong nitrogen compound, has a hardness of 160-250HV0.05/10, and has a microstructure that is a deformed structure having a grain size scale greater than or equal to 9 or a deformed structure after cold machining. Alternatively, the preform is an iron alloy containing a strong nitrogen compound, and has a microstructure that is a deformed structure having a grain size scale greater than or equal to 9 or a deformed structure after cold machining. The lumen stem preform meets the requirements of a conventional stent for radial strength and plasticity, so that plasma nitriding is applicable to commercial preparation of a lumen stent.

The invention provides medical devices comprising high-strength alloys which degrade over time in the body of a human or animal, at controlled degradation rates, without generating emboli and which have enhanced degradation due to the presence of a halogen component. In one embodiment the alloy is formed into a bone fixation device such as an anchor, screw, plate, support or rod. In another embodiment the alloy is formed into a tissue fastening device such as staple. In yet another embodiment, the alloy is formed into a dental implant or a stent.

The disclosure discloses a claw-shaped pedicle screw fastener for osteoporosis, including an inner screw plug and an outer screw; the outer screw includes an outer nut and an outer screw stem, a through hole is defined in and penetrates through the outer nut and the outer screw stem, the outer screw stem has a thread segment, a claw-shaped segment, and a conical segment that are provided on outside of the outer screw stem; the claw-shaped segment is made of deformable metal; the inner screw plug includes an inner nut and an inner screw stem, the inner screw stem is inserted into the through hole, and the inner screw stem is threadedly connected to the first inner thread and the second inner thread; the inner screw stem and the second inner thread are reverse thread screws relative to each other.

The present invention is drawn to a medical Pt alloy wire, made of a Pt—W alloy containing 10% by mass or more and 15% by mass or less of W, a balance of Pt, and inevitable impurities. The Pt alloy wire has Vickers hardness of 400 Hv or more and 600 Hv or less, and has hardness and strength superior to those of a conventional Pt alloy wire having the same composition. The Pt alloy wire of the present invention has properties preferable as a coil applied to an embolic coil or a guide wire or the like, and is also good in workability in secondary processing for producing such a medical tool.

This invention provides a measure that makes it possible to prevent more effectively, in comparison with the prior art, the invasion of germs from the gap between a dental prosthesis and the gingiva when the dental prosthesis is used in an oral cavity as well as the infection and inflammation associated therewith.

There is a dental prosthesis or a component thereof, characterized in that: the dental prosthesis or the component thereof has hydroxyapatite fine particles on a surface of the dental prosthesis or the component thereof; the hydroxyapatite fine particles are sintered bodies; and the hydroxyapatite fine particles have a mean particle size of 10 to 1,000 nm.

A method of incorporating silver and/or copper into a biomedical implant includes: providing an implant having an outer surface; depositing silver and/or copper onto the outer surface of the implant; diffusing the silver and/or copper into a subsurface zone adjacent the outer surface; and oxidizing or anodizing the implant after the diffusion step to form an oxidized or anodized layer that contains at least some amount of elemental silver, elemental copper or silver or copper ions or compounds.

A bone plate includes a main body defining one or more openings and a cavity. A support member formed of a different material than the material of the main body is disposed in the cavity and defines one or more openings, each of which is coaxial with an opening of the main body. The support member extends into circumferential recesses defined by the main body. Circumferential projections bounding each main body opening are disposed between circumferential projections of the main body and are disposed entirely within the support member. Bone plate systems, methods of treatment, and methods of manufacturing are also described.

A bone fixation plate comprises a main body formed of a first material and a support member formed of a second, different material and attached to the main body. The main body defines a first set of openings and the support member defines a second set of openings aligned with the first set of openings. For each opening of the first set of openings, a main body circumferential surface is disposed adjacent and continuous with a support member circumferential surface of the second set of openings to define an opening circumferential surface that bounds an opening of the first set of openings and an opening of the second set of openings.

The invention described herein relates to telescoping stents. The embodiments described herein allow for adequate securement to, accommodation for movement by, and prevention of injury of tubular organs or hollow areas of the body. Certain embodiments relate to telescoping steins with loop interlocking mechanisms. Further embodiments relate to telescoping stents with ball-in-groove interlocking mechanisms.

Bacteria, cancer cells, fungus and other harmful cells located beneath the surface of a mammal body can be effectively destroyed by passing an electrical current through the area to be treated. Electrodes are positioned on either side of the area to be treated, for example, gums, fingers, arms, legs, feet and torso, and an electric current is caused to flow between the electrodes and through the area to be treated. The electric current will destroy the bacteria, cancer cells, fungus or other harmful cells.