A bone screw for intramedullary fixation of hand or foot bones comprises three sections of a threaded distal portion, a threaded center portion and a threaded proximal portion. The threaded distal portion comprises a first full thread with a first constant diameter and a first constant pitch throughout the threaded distal portion, wherein an open end of the threaded distal portion forms a leading end of the bone screw. The threaded center portion comprises a second full thread with a second constant diameter and a second constant pitch throughout the threaded center portion, wherein the second constant diameter is the same as the first constant diameter, and the second constant pitch is smaller than the first constant pitch. The threaded proximal portion comprises a third full thread with a third constant diameter and a third constant pitch throughout the threaded proximal portion.

A stylet control system for selectively advancing and retracting a stylet includes a stylet having a first end and a second end, the second end being threaded, a screwdriver defining a bore for receiving a portion of the stylet and having a screw-engaging end for engaging a screw, the stylet being rotationally fixed relative to the screwdriver. The system includes a control device having a passage for receiving the screwdriver and having an inner portion defining a lumen for receiving the portion of the stylet, the inner portion being threaded for engaging the threaded second end of the stylet, when the screwdriver is rotated in the first rotation direction and the control device is prevented from rotating, the screwdriver advances the screw in the first axial direction and the stylet retracts in a second axial direction, opposite the first axial direction.

A bone screw includes a screw body having a head at one end of the screw and a tip at an opposite end of the screw; head threads directly attached to the screw body and continuous around the head of the screw; tip threads directly attached to the screw body and continuous around the tip of the screw; and overhanging thread portions between the head threads and the tip threads, the overhanging thread portions spaced apart, with unthreaded channels between the overhanging thread portions and the overhanging thread portions overhanging a portion of the unthreaded channels.

A bone screw for sacroiliac joint fusion is characterized by a longitudinal bone screw and a cylindrical sleeve received on a proximal end of the bone screw. The sleeve has axially extending fins or flutes on its outer surface that extend generally from one end of the sleeve to the other end of the sleeve. This feature allows the sleeve to resist reverse rotation which, in turn, aids in preventing back-out of the bone screw once installed. The bone screw has a self-tapping tip that allows the bone screw to be installed without need for a pilot hole, and self-harvesting geometry that gathers and retains bone shavings in and along the bone screw that are produced by bone screw installation for use as graft for bone fusion.

A pedicle bone fastener may include a shaft, a helical thread, and an integrated attachment feature. The shaft may include a proximal end, a distal end, and a longitudinal axis. The helical thread may be disposed about the shaft along the longitudinal axis between the proximal and distal ends of the shaft. The helical thread may include a first undercut surface and a second undercut surface. The first undercut surface may be angled toward one of the proximal end and the distal end of the shaft and the second undercut surface may be angled toward the other one of the proximal end and the distal end of the shaft. The integrated attachment feature may be disposed at the proximal end of the shaft and configured to be adjustably secured to a spinal stabilization implement.

An implant in the form of a bone screw that meets device tracking requirements set for the in the FDA regulations is provided. The bone screw includes a screw body and a tag body formed as an integral extension of the screw body and is connected to the screw body via a frangible interface bone screw. The screw body has a head portion and a threaded shaft portion that extends along a longitudinal axis from the head portion to a screw tip of the screw body. The tag body defines at least one surface configured to display traceability information for the bone screw. The frangible interface is disposed between the tag body and the screw tip of the screw body. The frangible interface is configured to fracture upon application of a predefined mechanical force so that the tag body is removable from the bone screw.

A hybrid radiolucent screw having radiopaque components and radiolucent components, which collaboratively define a tip of the screw and a head of the screw. In this manner, distortion is minimized during fluoroscopy or radiography of the screw while visualization of the screw and surrounding area is enhanced.

A bone marrow access apparatus includes a bone penetrating member and a cap. The bone penetrating member includes a tubular insertion portion, and a head portion provided at a proximal end of the tubular insertion portion. A cross-sectional shape of the head portion is wider than a cross-sectional shape of the tubular insertion portion. A recess is provided in the head portion, and an internal channel is provided through the head portion and the tubular insertion portion. The cap accommodates the head portion of the bone penetrating member therein. The cap includes a lower wall which covers at least a part of a distal side of the head portion, and a projection which projects into the recess of the head portion.

An anchoring fixture for anchoring a prothesis to a skull bone may comprise a screw thread apparatus including a screw thread having a varying outer diameter and formed along a longitudinal length of the anchoring fixture; a flange configured to function as a stop for the anchoring fixture adapted to rest on top of the bone when the anchoring fixture is implanted into the bone; at least a main relief chamber formed into a portion of the screw thread having a first side along the longitudinal length that is curved shaped, and wherein the anchoring fixture is tapered over at least a first portion of the longitudinal length of the anchoring fixture and where the first portion is arranged at a distal end of the anchoring fixture, and where the distal end is opposite to the flange.

The invention provides a nonmetal implant screw locking structure, which has the advantages of simple structure, novel design, simple production and processing, and convenient clinical operation. In addition, the structure of the invention can be used for orthopedic nonmetal implants such as the bone injury repair plate, spinal fusion cage, spinal fixation plate, posterior cervical single trapdoor plate, posterior cervical plate, lumbar anterior plate and lumbosacral plate, bringing good economic and social benefits gradually.