Abstract: An arthroscopic surgery method for ankle impingement of the embodiment removes a posterior process of talus from the portal formed in the position specified beforehand by vibrating ultrasonically of an ultrasonic treatment tool which inserted and inserted the ultrasonic treatment tool to the posterior process of talus and a tendon sheath of flexor hallucis longus muscle tendon, and deletes the tendon sheath of flexor hallucis longus muscle tendon by the ultrasonic treatment tool used for deleting the posterior process of talus.

Abstract: A system for implanting an implant screw into one or more bones of a patient, such as the sacrum and the ilium, can include a rod and a screw. The screw can be generally hollow and have a blunt distal end. The rod can include a threaded and pointed distal end that is inserted through the rod to drive the screw through the bones. Once the screw is at a desired position, the rod can be removed such that the sharp driving edge used to seat the screw does not remain in the bone. The system can further include an extraction tool having a generally hollow body sized to be inserted over the rod and a distally located screw engagement portion configured to engage the screw to adjust positioning of the screw after it is initially seated.

Abstract: An orthopedic device for repairing a portion of a body comprises an orthopedic plate and a tissue protector. The orthopedic plate is configured to attach to at least one bone. The tissue protector is securely attached to the orthopedic plate and configured to at least partially detach from the orthopedic plate after a force is applied to the tissue protector. The tissue protector includes a thinned region at a portion of the tissue protector proximate to the orthopedic plate. A method of repairing parts of a body with an orthopedic device having an orthopedic plate and a tissue protector securely attached to the orthopedic plate comprises placing the orthopedic plate on at least one bone; fastening a fastener into the tissue protector and then the orthopedic plate; and detaching the tissue protector from the orthopedic plate after the fastener is completely fastened into the tissue protector and the orthopedic plate.

Abstract: The distribution of load stresses on threads engaged with a standard screw or nut is very unequal. Indeed, the first threads in engagement support a large majority of the load. So if the load is too important, the threads give way and the function is not provided any more by the screw or the nut. In the prior art, threads are known whose depth or pitch varies a lot in order to cause a self-clamping. In particular, the invention aims at optimizing the resistance and the fatigue resistance of the screws by distributing the load at the very best on their threads without causing this self-clamping. It was shown that the control of the pitch variation, within a chosen pitch tolerance, makes it possible to control the stress distribution on the threads. It is possible to determine a different variation for each load case encountered.

Abstract: A low energy wood screw that may be inserted quickly and using less energy than conventional screws. In various embodiments, the screw may include a countersunk head having a recess for accommodating a driving tool, a tapered neck, a plurality of crown ribs extending over the head and neck, a lubricating coating, main threads with a large thread lead, and lower threads having an asymmetrical profile and extending onto a gimlet point.

Abstract: There is provided a tapping screw having a high anti-loosening effect and a high pull-out resistance for resin-molded components. A tapping screw 1 according to the present invention is configured such that an intersection P between a root 10 and a clearance flank 8 of a thread 7 is set such that a first engaging rate ?1 exceeds 50%, the first engaging rate ?1 being percentage of an actual engaging height H1 to a hole 6 against a first thread height H2 from a crest of the, thread 7 to the intersection P, an intersection Q between the root 10 and a pressure flank 9 of the thread 7 is set such that a second engaging rate ?2 is smaller than the first engaging rate ?1 and no smaller than 50%, the second engaging rate ?2 being percentage of the actual engaging height H1 to the hole 6 against a second thread height H3 from the crest of the thread 7 to the intersection Q, and the root of the thread inclines downward toward a tip direction, extending from the intersection P to the intersection Q thus set.

Abstract: Techniques for reinforcing concrete using rebar are disclosed. Some example embodiments may include prestressed concrete structures reinforced by twisted, threaded reinforcing bars. An example reinforcing bar for a prestressed concrete structure may include an elongated, generally cylindrical rod; an external thread disposed on the generally cylindrical rod, the external thread formed from an elongated, generally nonlinear channel wrapped about a radial surface of the generally cylindrical rod in a generally helical fashion. A base portion of the nonlinear channel may be disposed substantially against the radial surface of the generally cylindrical rod and/or an upstanding portion of the nonlinear channel may extend generally orthogonally from the radial surface of the generally cylindrical rod.

Abstract: A wave thread form for threaded fasteners includes multiple thread pitches along a generally helical path, and includes multiple wave thread portions each deviating from a straight-line helical path, with adjacent wave thread portions along the helical path being separated by standard thread portions extending along the generally straight-line helical path.

Abstract: Fasteners are provided that include a head and having a head, a tip end having a tip, a first body portion having first threads having a pitch angle, and a second body portion having second threads, the second threads having a different pitch than the first threads. The first body portion is adjacent to the tip end of the fastener and extends a first distance along a length of the fastener towards the head end. The second body portion is adjacent to the first body portion, and extends the head end of the fastener and extending a second distance along the length of the fastener towards the head end.

Abstract: A bone screw comprising a threaded shank having a longitudinal axis and including a first helical threading extending along a first length of the threaded shank portion and a second helical threading extending from a location proximately adjacent the first helical threading and along a second length of the threaded shank portion. The first helical threading defines a first volume between adjacent thread turns along the first length, and the second helical threading defines a second volume between adjacent thread turns along the second length, with the first volume being different from the second volume.

Abstract: A threaded connector includes a base and a threaded male portion projecting axially outward from the base. The threaded male portion is adapted to mate with an associated threaded female socket. The threaded male portion includes a helical thread comprising three sections: (i) a lead-in section; (ii) a transitional cam-locking section; and, (iii) a friction-locking section. The friction-locking section is located adjacent the base, the lead-in section is spaced from the base, and the transitional cam-locking section connects the lead-in section to the friction-locking section. The helical thread includes a tip and a root. The lead-in section is defined by a first major diameter at the tip of said thread and the friction-locking section is defined by a second major diameter at the tip of the thread. The second major diameter is greater than the first major diameter.

Abstract: A device and method for fastening two component members. The device includes a first component member including at least two protruded portions each having a predetermined lead angle, and a second component member which keeps predetermined positional relationship with the first component member and has at least two protruded portions which are engaged with the protruded portions of the first component member, among at least two of which protruded portions, at least one of the protruded portion has a different lead angle from the lead angle of the protruded portions of the first component member, and the first and second component members can be moved closer opposite each other, the protruded portions are engaged with each other after moving opposite each other by a certain distance, and the first and second component members are integrally fixed by frictional engagement of the protruded portions differing in the lead angle.

Abstract: The present invention comprises a neck extending upwardly from a container and having an upper rim defining a neck opening. The neck has a substantially vertical sidewall of a constant thickness and at least one container neck thread extending from the sidewall. The at least one neck thread has an outer thread face drafted from a radially inward upper position to a radially outward lower position. The device further comprises a closure having a top wall and a skirt depending from the top wall, wherein the skirt is tapered. The closure comprises a closure thread extending helically along an inner surface of the skirt. The container thread has increasing radial length moving downwardly along the container neck.

Abstract: A screw includes a shank portion including a tapered bottom section having a tip, a head on top of the shank portion, and first and second helical threads. The first helical thread extends helically around the shank portion in a first direction between the tip and the head, and has a first end distal from the head, and a second end opposite to the first end. The second helical thread extends helically around the shank portion in a second direction between the first helical thread and the tip, and has a third end proximate to the second end of the first helical thread. The first and second directions are opposite to each other. A non-helical ridge extends around the shank portion between the first and second helical threads.

Abstract: A threaded element of plastic material for a joining assembly has a uniquely formed thread profile of a small profile angle between 30° and 50° and a rounded crest of a relatively large radius of curvature. The gap between the revolutions of the thread is of a volume which exceeds that of the thread. In order to provide for a specific cutting geometry of the thread profile the threaded element comprises a plurality of angular segments which are radially offset with respect to each other such that adjacent angular segments provide cutting edges. Furthermore, a tool and a method for making such a joining assembly are disclosed.

Abstract: A pin with threads that extend along a portion of a stem of the pin interact with framing members as the pin pierces and is axially driven through the framing members. The interaction of the threads with the framing members cause the pin to rotate as the threads pass through the framing members and fastens the framing members together.

Abstract: The invention relates to a screw 1 comprising a thread-forming thread 2 for the creation of a metric thread, comprising a load-bearing thread portion 3 and a forming thread portion 4 which is tapered to the tip of the screw. The flights of the tapered thread portion 4 are sharp-edged and fully formed.

Abstract: The screw with a plurality of helix angles comprises a first section having a first thread with a first helix angle, at least one third section having a third thread with a third helix angle; and a fifth section having a fifth thread with a fifth helix angle wherein the fifth thread is identical to the first thread. The third helix angle is equal or not equal to the first helix angle. Moreover, the screw further comprises a second section connected between the first section and the third section; the second section having a second thread with a second helix angle; a fourth section connected between the third section and the fifth section; and the fourth section having a fourth thread with a fourth helix angle. A mold device for forming the screw is also included. The mold device further comprises a second mold line-symmetrical to the first mold.

Abstract: A pole joint screw may be used to connect a first section of a basketball support pole and a second section of a basketball support pole. The pole joint screw may include an elongated body including a first end and a second end, a head disposed on the first end of the elongated body, a threaded portion disposed on the second end of the elongated body, and a gap disposed between the head and the threaded portion. The gap is preferably sized and configured to receive a portion of the first section of the basketball support pole and a portion of the second section of the basketball support pole. The pole joint screw preferably freely rotates when the portion of the first section of the basketball support pole and the portion of the second section of the basketball support pole are located in the gap.

Abstract: A screw, driving device, and method are provided for repairing a tissue injury of a patient, such as a meniscal tear in a knee or osteochondritis dissecans. The screw has a root, a distal section having a narrowing cross section toward the distal end, and a thread along at least a portion of the root between the proximal end and the distal end. Along a leading section extending from the distal end, the helical pitch is substantially constant; along a trailing section between the leading section and the root's proximal end, the helical pitch decreases. The substantially constant pitch along the leading section assists in preventing a stripping of the helical section. At the proximal end is a head having a diameter greater than a major root diameter of the central section. The head is for improving the tissue retention characteristics of the screw.

Abstract: In a nut disengagement prevention structure, a bolt has an external thread. A nut which is thread on the bolt has an internal thread. A thread portion which is the closest to a leading end of the bolt has a first minor diameter. Any other portion of the thread of the bolt has a second minor diameter which is smaller than the first minor diameter. The second minor diameter is substantially identical with a minor diameter of the internal thread of the nut.

Abstract: A fastener, driving device, and method are provided for repairing a tear in soft tissue of a patient, such as a meniscal tear in a knee. The fastener has a distal section having a narrowing cross section toward the distal end and a helical protrusion along a central section between the proximal end and the distal end. Along a distal section extending from the distal end, the helical pitch is substantially constant; along a central section between the distal section and the proximal end, the helical pitch decreases from the distal end to the proximal end. The substantially constant pitch along the distal section assists in preventing a stripping of the helical section. At the proximal end is a head having a diameter greater than a major root diameter of the central section. The head is for improving the tissue retention characteristics of the fastener.

Abstract: An anchor bolt having a substantially cylindrical stem (2), and at least one thread provided on the stem (2) and extending from a free front end of the stem at least over a portion of a longitudinal extent of the stem (2), the thread (6) having a plurality of thread turns (6) having, at least over one/third of the stem (2), a width (b1, b2) which decreases, with an increase of a distance of a respective thread turn (6) from the free front end of the stem (2), so that a distance (x1, x2, x3) between trailing and leading flanks (8, 7) of two following one another thread turns (6) of the thread increases backwards.

Abstract: The invention involves a differential and/or conical screw of a variable increasing pitch which is used for the initial mechanical stimulation of a healthy bone, in order to induce a new internal strain and the consequential biological reaction of the bone. The biological reaction results in the formation of a new, young superficial bone, and the process takes between 4 and 8 weeks. The new bone is used as an autologous bone transplant. The transplantation of this new bone into other parts of the body, where such a procedure is indicated, is a new method referred to as adaptive periosteal cambiplasty. The process of the implantation of the screws into the bone is controlled with the use of a special moment key, which provides for the induction of a defined and desired stimulation force, and it also provides for the safety of the method.

Abstract: The invention relates to a threaded pin for holding together pieces of a fractured bone. The pin comprises a body having a distal end and a proximal end. The distal end has a first thread presenting crests and the proximal end has a second thread presenting crests. The first thread and the second thread being spaced apart by a smooth portion. The first and second threads are such that the pitch X of the first thread and the pitch Y of the second thread both decrease from the distal end (X1, X2, Y1, Y2) towards the proximal end (Xn, Xn−1; Yn, Yn−1). The diameter d of the crests of the first thread and the diameter D of the crests of the second thread both increase from the distal end (d1, d2; D1, D2) towards the proximal end (dn, dn−1; Dn, Dn−1), and the values are such that: X1>X2>Xn−1>Xn>Y1>Y2>Yn−1>Yn and Dn>Dn−1>D2>D1>dn>dn−1>d2>d1. The invention is applicable to repairing bones.

Abstract: A bone screw having a continuously varying pitch includes a tapered root portion having a relatively small diameter on a leading end of the screw and a larger trailing diameter. The pitch of the screw decreases between the leading and trailing ends thus causing the bone fragments in a fracture to be drawn together when the screw is installed across the fragments. The radially outer diameter of the threads increases between the leading and trailing ends thus causing each successive thread portion to cut into bone radially outwardly from the preceding thread portion thereby providing uncut bone in which the succeeding threads can gain purchase.

Abstract: A fastener assembly connects two layers of different hardness in a panel. e assembly has a screw and has a mechanism for boring through the softer layer comprised of a collar of material softer than the material of the screw. The screw is tapped into the collar and has a bit for boring through the harder layer of the panel. The screw's head fits into the collar so that the screw and collar can be countersunk together into the softer layer of the panel. The collar has a lead end having a leading cutting edge for drilling into the softer layer of the panel. The collar also has a trailing end having a frustoconical skirt on which is located a trailing cutting edge. The torque to rotate the screw in the collar is greater than a torque to rotate the collar in the softer layer of the panel. But the torque to rotate the screw in the collar is less than the torque to rotate the screw in the harder layer of the panel.

Abstract: A bone screw having a continuously varying pitch includes a tapered root portion having a relatively small diameter on a leading end of the screw and a larger trailing diameter. The pitch of the screw decreases between the leading and trailing ends thus causing the bone fragments in a fracture to be drawn together when the screw is installed across the fragments. The radially outer diameter of the threads increases between the leading and trailing ends thus causing each successive thread portion to cut into bone radially outwardly from the preceding thread portion thereby providing uncut bone in which the succeeding threads can gain purchase.

Abstract: A self-tapping, self-captivating fastener is provided for engagement in a predrilled aperture to enable the connection of an electrically conductive element such as a lead wire, or spade type terminal attached to the end of such a wire, to a workpiece or bus bar. The fastener includes a shank and an enlarged driving head, said shank having a threaded portion which includes a thread lead-in portion that tapers and converges in a direction away from the driving head toward an enlarged abutment projection formed at the work entering end of said fastener. The diameter of this abutment projection is less than the diameter of the predrilled aperture and said apertural diameter is less than the crest diameter of the threaded portion. Thus the abutment portion may pass through this aperture with said threaded portion reshaping the periphery of the aperture to form internal mating threads, such that the apertural diameter is reduced to less than that of the abutment portion.