259 results about "Screw system" patented technology

An anterior buttress staple and screw system is provided that can be used to hold an implant such as a disc prosthesis in place and thereby prevent its migration out of the spinal column. The buttress staple comprises a screw locking plate having a screw locking design that prevents the screw from backing up and away from the plate. The screw is configured to provide an interference fit with the screw locking plate, and can be used as a staple removal tool during revision surgery when the screw locking plate needs to be lifted from the bone surface on which it is attached.

Systems, including apparatus and methods, for internal fixation of a fractured or otherwise compromised bone. These systems may include and / or make use of bone plates, locking screws, and / or kits, among others.

A surgical screw system for use with implantation rods includes a screw member, a receiver member, a pressure cap and a locking device. The screw member has a shaft and a head with a spherical undersurface and a conical tapered recess. The receiver member has an upper and lower portion, a u-shaped rod receiving channel and an axial bore. The u-shaped channel has two lateral legs at the upper portion and forms an opening leading to the axial bore. The axial bore near the lower portion includes an inwardly conical tapered surface which has a diameter larger than the shaft of the screw member but smaller than the head of the screw member. The conical surface forms a support upon which the spherical undersurface of the head of the screw member rests when the screw member is guided through the bore of the lower portion of the receiver member. The pressure cap is positioned within the axial bore and situated upon the head of the screw member. The locking device is designed for securing the rod within the u-shaped channel of the receiver member by applying a tightening torque upon the rod when positioned within the opening and the bore near the upper portion of the receiver member.

A prosthetic screw system that includes a prosthetic screw for at least partial insertion into a bone and / or cartilage. The prosthetic screw includes a head and a lower portion connected to the head. The prosthetic screw system also includes a set of head-pieces that can be connected to the head of the prosthetic screw. The head-pieces have differing configurations that are designed to be connected to different types of components of a prosthetic system. The universal connection arrangement between the prosthetic screw and the set of head-pieces enables the prosthetic screw to be customized for connection with a variety of components of a prosthetic system. The head-pieces can alternatively or additionally include a mechanical and / or electrical mechanism that provides one or more substances (e.g., medicine and / or other biological agent, etc.) and / or electrostimulation to a surgical site.

Featured are a method and apparatus for fixing adjacent vertebrate of a spine that avoids the need and associated problems with prior cage or straight rod and screw systems. Methods and apparatus of the invention utilize a new implant member, which preferably is arcuate. Preferred methods of the invention for stabilizing adjacent vertebrae of the spine, include steps of providing a positioning apparatus including two guide sleeves, each guide sleeve having a long axis and locating the two guide sleeves with respect to the adjacent vertebrae such that a vertex formed by the long axis of each guide sleeve is located in the intervertebral space for the adjacent vertebrae. The method further includes forming an aperture in each of the adjacent vertebrae using the guide sleeves and inserting an implant into the apertures formed in each of the adjacent vertebrae so that the implant extends between the adjacent vertebrae and through the intervertebral space. In an alternative method a cutting fixture including a pivot arm is secured to the adjacent vertebrae and a cutting device is secured to the pivot arm. The pivot arm and cutting device are configured and arranged so that rotation of the pivot arm about a particularly located pivot point allows the cutting device to form the aperture in each of the adjacent vertebrae. Another alternative method for fixing adjacent vertebrate of a spine includes the step of forming a common channel in and between the adjacent vertebrae and inserting a biscuit implant in the common so as to bridge between the adjacent vertebrae.

Systems and method in accordance with the embodiments of the present invention can include an implant for positioning within a cervical facet joint for distracting the cervical spine, thereby increasing the area of the canals and openings through which the spinal cord and nerves must pass, and decreasing pressure on the spinal cord and / or nerve roots. The implant can be inserted laterally or posteriorly.

A spinal fixation assembly and capless multi-axial screw system and method are shown. The assembly comprises a receiver having a rotary lock which in one embodiment includes a plurality of channels which urge and lock the elongated member to the screw using a bayonet type connection.

A facet screw system for surgical implantation into bone tissue having a shaft, a compression member and a washer. The shaft includes a shaft having a bone engaging portion and a compression member engaging portion. The compression member includes a spherical head portion having a recess for engaging with a driving instrument, and an elongated coupling portion having internal threads for coupling with the compression member engaging portion of the shaft and a washer coupled to the spherical head portion of the compression member and having a plurality of bone engaging protrusions. The washer is adapted to be polyaxially rotatable with respect to the compression member.

A delivery mechanism for an implantable stent which provides a high mechanical advantage to the surgeon and convenient operation so as to facilitate smooth withdrawal of an outer catheter sheath following placement of the stent in the desired location within the patient's vessel. Preferred embodiments include a moving rail actuated by a V-shaped lever, a hydraulic actuator, a rack and pinion drive, and a power screw system. The delivery mechanism has a movable member that is attached to the outer catheter sheath so that actuating the mechanism results in an incremental movement of the moveable member, which in turn results in an incremental movement of the outer catheter sheath. Once the outer catheter sheath is retracted from the stent, the stent is deployed into the patient's vessel and the remaining parts of the mechanism, including an inner tube, an atraumatic tip, and a stabilizing element, are easily removed.

A surgical screw system using a surgical screw that is at least partially bioabsorbable in vivo, the screw having a recess (or optionally recesses) in its head for receiving an inserter instrument, wherein the recess has a rotational symmetry around the longitudinal axis of the screw. The recess comprises an odd number of rounded lobes extending away from the center of the head. The inserter for the screw comprises a distal end that matches the shape of the recess in the screw and can be slidably engaged with the recess.

A polyaxial screw system and method are provided. The system comprises a receiver having a pivot area defined by a pivot joint or a material between a pair of receiver walls or members that permit the receiver walls or members to move or pivot relative to each other so that a dimension of a socket area can be changed. The socket area is defined by socket walls that when at least one of the receiver members pivots relative to another receiver member or wall, a distance between the socket walls gets smaller so that the socket walls can engage and lock against a head of a polyaxial screw.

The present invention relates to an orthopedic plate and screw system and instruments for surgical fixation of a small bone or bones. The plate facilitates three dimensional contouring to provide for a variety of applications and to accommodate individual variation in bone shape. The plate has a modified x shape including a central trunk portion including one or more screw holes along a longitudinal axis and a set of divergent upper and an oppositely extending set of divergent lower arms, each arm including screw holes which are placed at a radially equal distance but which diverging asymmetrically from the longitudinal axis relative to its paired upper or lower mate. The screws of the system are self-starting, self-tapping screws including the option of partial or full cannulation.

A bone screw assembly for joining bone fragments having a screw shaft, a compression head and a sleeve. The compression head has external threads for providing double compression of the bone fragments. The sleeve extends along and around the screw shaft to provide reinforcing strength and alignment to the screw.

An orthopedic screw system. The screw system comprises an outer member and an inner screw. The outer member has a longitudinal inner channel that defines an interior sidewall and is provided with screw threads on its exterior and interior sidewalls. An inner screw has threads constructed and arranged to engage with those on the interior sidewall, such that the inner screw may be secured within the inner channel. When secured within the inner channel, at least a portion of the length of the inner screw extends beyond the outer member. Methods of installing the orthopedic screw system into osteoporotic or otherwise weakened bone are also disclosed.

A two-part screw system for use in bone repair and joint replacement includes a first portion and a second portion capable of mating with the first portion. The first portion includes a thread for engaging cancellous bone within a portion of a bone on one side of a fracture. The second portion is coupled to a retention mechanism that couples a portion of the bone on opposite sides of the fracture to a portion of the bone having the first portion of the two-part screw.

A spinal clip for creating a potential space within the spinal canal and thus stabilizing the spine without the need for additional spinal components is embodied in different forms. The spinal clips are configured to provide a clamping or holding force against and / or to the spinous processes, transverse processes and / or the lamina of adjacent vertebrae. In one form, the spinous process clips utilize pivoting to effect clamping or holding. In another form, the spinous process clips utilize rotation to effect clamping or holding. Such rotation may be between clamping or holding members or via a screw system. In yet another form, the spinous process clips utilize ratcheting to effect clamping or holding. In a still further form, the spinous process clips utilize expansion to effect clamping or holding. Depending on the form of clamping or holding, the spinous process clips can provide infinite adjustment of the clamping or holding force within an adjustment range, or provide discrete steps or levels of the clamping or holding force.

The present invention relates to a nail and screw system (1) for improving the fixation of proximal fractures of the humerus, including at least a Numeral nail (10) to be inserted in a Numeral shaft (9) and comprising at least a proximal transversal hole (5) for the passage of a corresponding locking screw (3), the screw (3) having a screw head (4) and a screw body (31). Advantageously, the nail is cannulated and the transversal hole (5) comprises a couple of opposite holes (6′, 6″) on opposite wall of the cannulated nail (10); the hole (6) closer to the screw head (4) has an internal partially threaded portion (28) and the corresponding screw (3) has an outside thread diameter smaller than the diameter of said at least one transversal hole (27) that receives such a screw. The partially threaded portion (28) works as a portion of nut screw but doesn't interfere with the screw during the normal insertion. In case of a undesired movement or displacement of the screw (3) after its final fastening or in use, the internal threaded portion (28) solve the problem engaging the threaded portion of the screw (3) at least in a crest to crest fashion.

The invention encompasses compositions, methods, and kits, for fixing bone and / or repairing connective tissue associated with bone using a fenestrated bone screw. In certain embodiments, the invention encompasses a pedicle screw system including a bio-resorbable or implantable capsule containing cement and methods of use thereof for treating, preventing, and managing disorders in osteoporotic patients. In certain embodiments, the invention encompasses a fenestrated pedicle screw with cement containment skin that is useful in treating subjects in need of spine surgery due to neurologic deficit, deformity, or trauma, which subjects do not have sufficient time for the medical treatment of osteoporosis.

An anchoring system for bones comprises male and female anchoring members each having proximal and distal ends, the proximal ends being adapted, when the anchoring members are installed in the bone, to be spaced from each other with the male and female anchoring members converging from the proximal ends towards the distal ends. The male and female anchoring members are adapted to be connected to each other in the bone and distally of the proximal ends via a connection mechanism generally in the form of mating threads. The male anchoring member comprises at least first and second sections provided respectively with the thread and with at least part of the connection mechanism, the first and second sections being rotatable independently of one another and being telescopically mounted together.

The invention provides a propeller thrust measuring device, which comprises a base, an upper part frame, two lead screw systems, a worm gear and worm system, and a measuring system. The entire propeller thrust measuring device spans over a circulating water tank, and the center line of the device and that of the circulating water tank are on the same vertical plane; a lifting column is lowered to an appropriate depth by utilizing the lead screw systems after a propeller and a balance are fixed, and the lifting column is rotated via the worm gear and worm system so as to adjust an axis of the propeller to be coincide with the center line of the circulating water tank; and the propeller is turned on to a certain rotation speed, the balance can transmit a thrust value of the propeller to a water surface data acquisition instrument under the condition of zero flow velocity, and a thrust value of the propeller under the condition of a flow velocity can be measured through turning on a flow generating device of the circulating water tank. The propeller thrust measuring device is simple in structure, accurate in measurement and high in practical value, can provide important reference numerical values for propeller thrust measurement of water surface and underwater vehicles, and can conduct motion control research of the vehicles more precisely.

The invention discloses a high-precision positioning automatic screwing system which comprises a mechanical arm device, a rotating disc device, a feed device, a bottom plate, a control system and a power supply. A first slide rail, a second slide rail and a third slide rail are arranged on the bottom plate. The mechanical arm device, the rotating disc device and the feed device are all installed on the bottom plate, are matched with the first slide rail, the second slide rail and the third slide rail in a sliding mode respectively and are pneumatically driven to move. Through the reasonable structural design, by means of the method that the mechanical arm device, the rotating disc device and the feed device work in cooperation, the simple screwing motion becomes the automatic motion, and the screwing work for a screw can be effectively completed.

A gantry disk sawing machine for flat aluminium ingot is composed of machine frame, conveying roller way, ingot loading mechanism, clamping mechanism for sawing, gantry frame, the running box with motor and main shaft and leading screw system, which are installed to the gantry frame, disc saw installed to said main shaft, cooling system, hydraulic station and electric controller system. Its advantages are high sawing speed and accuracy and no environmental pollution.

A roller screw system comprises a screw shaft, a nut, a pair of return members, a return pipe and a plurality of rollers. The nut is interiorly defined with a receiving recess for accommodation of the return members, and an abutting surface. The roller screw system is characterized in that a through hole is defined in the nut and is in communication with the return hole. The return pipe is disposed in the through hole of the nut. The return members are disposed in the receiving groove of the nut, forming a return system. And the return system is to be connected to the helical groove of the screw shaft and the nut, thus forming a roller screw system. By such arrangements, the rollers can circulate more smoothly and the size of the nut will not be increased.

A sliding device is provided in which a ball-nut screw system is disposed in a relation lying out of a guide rail and extending by the side of and in parallel juxtaposition with the guide rail, thereby making it possible to reduce the sliding device in the overall height. The ball-nut lead screw system may be easily mounted and / or demounted from the sliding device and easily made varied depending on design considerations. The sliding device includes the lead screw carried for rotation by bracket bearings in a way lying out of a guide rail in a way extending by the side of and in parallel juxtaposition with the guide rail, and a ball nut mounted to a slide table. The lead screw is actuated by a motor carried in a bracket bearing.

An internal fixator for vertebral arch pedicle is composed of several cylindrical correcting rods, flat square transverse bridge, and several screws for vertebral arch pedicle. Said screw has a screw bolt with external spiral thread on its lower part, and an expanded head with a U-shaped deep slot for recepting said correcting rod and shallow square slots on both side surfaces for recepting said transverse bridges.