초록 ▼

A method of producing a high-density article is presented comprising selecting one or more primary tungsten-containing constituents with densities greater than 10.0 g/cc and one or more secondary constituents with densities less than 10.0 g/cc, co-milling the mixture of constituents in a high-energy

A method of producing a high-density article is presented comprising selecting one or more primary tungsten-containing constituents with densities greater than 10.0 g/cc and one or more secondary constituents with densities less than 10.0 g/cc, co-milling the mixture of constituents in a high-energy mill to obtain mechanical alloying effects, then processing the resulting powder product by conventional powder metallurgy to produce an article with bulk density greater than 9.0 g/cc.

대표청구항 ▼

A method of producing a high-density article is presented comprising selecting one or more primary tungsten-containing constituents with densities greater than 10.0 g/cc and one or more secondary constituents with densities less than 10.0 g/cc, co-milling the mixture of constituents in a high-energy

A method of producing a high-density article is presented comprising selecting one or more primary tungsten-containing constituents with densities greater than 10.0 g/cc and one or more secondary constituents with densities less than 10.0 g/cc, co-milling the mixture of constituents in a high-energy mill to obtain mechanical alloying effects, then processing the resulting powder product by conventional powder metallurgy to produce an article with bulk density greater than 9.0 g/cc. ving in response to a tensional force less than a threshold force applied to any of the first mad second portion, the filament moving longitudinally in response to a tensional force greater than the threshold force applied to any of the first and second portion, wherein the filament has a breaking tension greater than the threshold force. 2. The device of claim 1, wherein the threshold force is in a range 25-35 pounds. 3. A device for anchoring a filament to tissue or bone, comprising: an anchor member adapted to be embedded in bone, the anchor having a cavity therein, wherein the anchor member comprises, an anchoring element for insertion into a hole in tissue, the anchoring element including an axial channel extending between proximal and distal ends thereof, the anchoring element being slidably mounted on an insertion stem, the insertion stem including a portion having a greater outer diameter than an inner diameter of the axial channel, that portion being referred to herein as the portion of the greater diameter, the insertion stem being adapted to move proximally in the axial channel to cause the portion of greater diameter to move at least partially through that channel and, thereby, to cause the anchoring element to expand to a pressure fit with the bone hole; and a filament having a first and second portion extending from the cavity, the filament being held in the cavity by interference fit, the filament substantially not moving in response to a tensional force less than a threshold force applied to any of the first and second portion, the threshold force being less an the breaking tension of the filament, the filament moving longitudinally in response to a tensional force greater than the threshold force applied to any of the first and second portion. 4. The device of claim 3, where the cavity is formed by and disposed between a surface of the anchoring element and a surface of the insertion stem. 5. The device of claim 1, wherein at least two sections of the filament, disposed between the first and second portions, pass through the anchor member, so that a loop segment is defined between the sections. 6. The device of claim 5, wherein the loop segment can be tightened by pulling any of the first and second portions of filament with a tension greater than the threshold tension. 7. The device of claim 5, wherein the loop segment can be loosened by pulling the loop segment with a tension greater than twice the threshold tension. 8. The device of claim 1, wherein the anchor member is adapted to be embedded in a tunnel in bone. 9. The device of claim 1, wherein the anchor member comprises a biocompatible material selected from the group consisting of polyethylene, polypropylene, steel, poly-l-lactide and lactide-gylicolide compositions. 10. A device for anchoring soft tissue to bone, comprising: an anchor member adapted to be embedded in a bone tunnel and having a cavity therein; and a filament having a first and a second portion extending from the cavity, the filament being held in the cavity by interference fit, the filament substantially not moving in response to a tensional force less than a threshold force applied to any of the first and second portion, the filament moving longitudinally in response to a tensional force greater than the threshold force applied to any of the first and second portion, whereby the filament can be used to secure soft tissue, wherein the filament has a breaking tension greater than the threshold force. 11. The device of claim 10 wherein the threshold force is in a range 25-35 pounds. 12. A device for anchoring soft tissue to bone, comprising: an anchor member adapted to be embedded in a bone tunnel and having a cavity therein, wherein the anchor member comprises, an anchoring element for insertion into a hole in tissue, the anchoring element including an axial channel extending between proximal and distal ends thereof, the anchoring element being slidably mounted