73 results about "Lag screw" patented technology

An orthopedic fixation device (e.g., an intramedullary (“IM”) nail or bone plate) including a lag screw and a compression screw, the compression screw being nested with the lag screw. In accordance with one or more features of the present disclosure, the compression screw may include a partially non-threaded medial segment, an enlarged diameter, and / or a cannulated bore. In addition, and / or alternatively, the lag screw may be provided as an integrated assembly including a lag screw and an outer sleeve to enable the lag screw to telescope or slide relative to the outer sleeve and IM nail.

To provide a fracture treatment fixation device for femoral fractures, enabling further reliable treatment of fractures of proximal femur.SOLUTION: A fracture treatment fixation device for treating femoral fractures includes: an intramedullary nail to be inserted into a femoral cavity; a lag screw disposed to penetrate the intramedullary nail diagonally upward and entering a femoral head and a femoral neck; an anterior wall plate to be applied to an anterior wall of a femoral trochanter; and an anterior wall plate fixation pin disposed to penetrate the intramedullary nail and secure the anterior wall plate to the anterior wall of the femoral trochanter.SELECTED DRAWING: Figure 1

A fracture fixation system includes a fixation element having a plate and a barrel. The plate has an outer surface and an inner surface for placement against an exterior surface of a bone, and the barrel extends along a barrel axis and has a peripheral wall protruding from the inner surface of the plate. The fixation element defines first and second passages through the plate and the barrel that each extend along the barrel axis. The fracture fixation system further includes a first lag screw extending from a proximal end to a distal end and configured to be inserted through the first passage defined by the plate and the barrel. The fracture fixation system further includes a second lag screw extending from a proximal end to a distal end and configured to be inserted through the second passaged defined by the plate and the barrel.

Intramedullary aiming systems, instruments, and methods of treating bone fractures are provided. The aiming systems may include one or more instruments configured to ensure optimal alignment and placement of one or more components of an intramedullary nailing system, such as anteversion alignment, anti-rotation, lag screw aiming, distal aiming, and other instruments suitable to enhance and optimize the surgical procedure.

To improve workability while securing fire resistance performance of a steel joint member.SOLUTION: A wooden column joint member joint structure includes: a lower side wooden column 10 where a lag screw bolt 12 is provided on an upper end surface 10U; and a precast joint member 60 having a steel joint member 70 which is placed on the upper end surface 10U of the lower side wooden column 10, and which is joined to the lag screw bolt 12 by a bolt 84, and a precast concrete part 62 having a work hole 74H for storing the bolt 84 on an upper surface 62U, and for covering the steel joint member 70.SELECTED DRAWING: Figure 7

The present invention relates to a bio-resorbable calcium composite lag screw to achieve compression in small bone fractures. The design features allow for reliable insertion reducing the risk of fracture by having an internal geometry of the screw wherein an inserter or driver used to insert the screw applies force only to the threaded portion of the screw distal from the inserter or driver, reducing the risk of screw breakage on insertion.

The utility model discloses a medical screw for bone holding, which comprises an anti-rotation pressurizing screw and a lag screw, and the anti-rotation pressurizing screw and the lag screw are respectively provided with thread structures which are mutually twisted; the thread structure of the head of the anti-rotation pressurizing nail is a bone thread, and the thread structure of the tail of the anti-rotation pressurizing nail is a trapezoidal thick thread. According to the scheme, the thread structure of the head of the anti-rotation pressurizing nail is changed into the bone thread with the sharp periphery from a trapezoidal thick thread with a trapezoidal section, so that when the anti-rotation pressurizing nail is screwed into a fixing hole in a bone, the anti-rotation pressurizing nail can automatically drill into the bone of a human body through the bone thread, and certain holding force is exerted on the bone. Meanwhile, the lag screw is twisted with the threads on the surface of the anti-rotation pressurizing nail through the threads on the surface of the lag screw, and the lag screw can move in the axial direction of the anti-rotation pressurizing nail when screwed. The anti-rotation pressurizing nail in the scheme is simple to improve and high in practicability, and can be popularized and used on a large scale under the condition that extra medical cost is not increased.

The lag screw comprises a titanium alloy screw body and an injection channel, the injection channel comprises a plastic pipeline, one end of the plastic pipeline is fixedly connected with a limiting block, the end portion of the limiting block is fixedly connected with a connecting pipe, the end portion of the connecting pipe is connected with a connector, and the connector is fixedly connected with the titanium alloy screw body. A plurality of discharging holes are formed in the tail section of the plastic pipeline, two positioning grooves are formed in the plastic pipeline, the titanium alloy screw comprises a screw body, and a threaded section is arranged on the screw body. According to the lag screw suitable for old patients and intra-operative pressurization failure, the titanium alloy screw is screwed into a bone block, then the injection channel is plugged into the titanium alloy screw, and then an injector is used for injecting a reinforcing agent into the injection channel, so that the periphery of the threaded section of the titanium alloy screw is filled with the reinforcing agent, and broken bones are solidified together; and the grasping force is improved, and the pressurizing effect is improved.

To provide a mounting jig for a lag screw bolt capable of screwing a lag screw bolt to the depth of a pilot hole drilled into wood.SOLUTION: A tightening bolt body 1 is formed so as to be connected to a female screw part L3 of a lag screw bolt L. A holding cylinder 2 is formed into which the tightening bolt body 1 is inserted and to which a head part 1B of the tightening bolt body 1 is locked. The tightening bolt body 1 is inserted into the holding cylinder 2 fitted into a pilot hole Q1. The tip of the tightening bolt body 1 is connected to the female screw part L3 of the lag screw bolt L. The tightening bolt body 1 is configured to be screwed in until the holder cylinder 2 is embedded in the pilot hole Q1.SELECTED DRAWING: Figure 3

This invention provides an aiming device, including a loading mechanism, an aiming base, and a locking mechanism. The loading mechanism is used to load a target object. The aiming base has an aiming channel for the loading mechanism to pass through. The locking mechanism is disposed on the aiming base and selectively engages or disengages from the loading mechanism. The aiming device is configured such that when the loading mechanism is partially inserted into the aiming channel and is in a predetermined position, the locking mechanism engages with the loading mechanism and locks it on the aiming base, preventing movement of the loading mechanism relative to the aiming base. When the locking mechanism disengages from the loading mechanism, movement of the loading mechanism relative to the aiming base is permitted. This aiming device allows the fourth screw hole of the lag screw in the intramedullary nail assembly to be coaxial with the first screw hole of the main nail after insertion into the medullary cavity, thereby enabling rapid insertion of the locking screw.

To provide a lag screw bolt having no hexagonal head part with a female screw formed at its end part, which can be screwed with a normal rotary tool.SOLUTION: A bolt body 1 is formed so as to be screwed into a pilot hole Q1 drilled in wood Q. A thread 2 is formed so as to extend from a tip part to a rear end part of the bolt body 1. A square hole 3 having a planar polygonal shape is recessed into the rear end part of the bolt body 1. A female thread part 4 is recessed into a deep inside part of a mating recess part L3. A rotary tool is connected to the square hole 3 to screw the bolt body 1.SELECTED DRAWING: Figure 1

This product is a double-threaded bolt with a small hexagonal head on one side, used in the attachment of through-posts and girders or waist beams in conventional wooden buildings. It is fitted and tightened with the internal female thread of a lag screw bolt with internal threads on both ends, which has a lag screw shape with high and large threads, a wide thread pitch, and a thread portion that bites into the wood material, and then the through-post and girder are tightened and fixed with a washer and a hexagonal nut. This product is used when attaching through-posts to beams by processing in two directions or three directions in a T-shape and tightening and fixing with bolts. In light of the fact that the long tenon processing of the girders results in a considerable reduction in the cross-sectional area of ​​the columns, which is a major cause of building collapse, such as "back-bending" depending on the magnitude and severity of shaking during an earthquake, this method eliminates the long tenon processing of the girders on the mounting surface of the through-columns, minimizing the reduction in cross-sectional area, and enables the integrated rigidity of the through-columns and girders. This high-rigidity joint between columns and girders is achieved by using lag screw bolts with internal threads at both ends and double-threaded bolts with small hexagonal heads on one end, with the girders in contact with the mortise and tenon processing of the girders processed into the through-columns, and the double-threaded bolts with small hexagonal heads on one end are pre-installed inside the mounting girders. The bolt is secured to the inside of the column by fitting and fastening it with the internal female threads of a lag screw bolt with internal threads at both ends. After fastening, the bolt is secured by inserting a tightening nut through a countersunk hole in the top and bottom of the beam, and then fastening it with a hexagonal nut via a spring washer. The body shape of the double-threaded bolt with a small hexagonal head on one end is such that a small hexagonal head of a certain shape extends from one end. The diameter of the threads between the peaks of the hexagonal head is slightly smaller than the diameter of the internal threads of the hexagonal nut, making it easier to pass the nut through when fitting the external thread portion of the double-threaded bolt with a small hexagonal head on one end with the washer and hexagonal nut for later tightening. It is characterized by having a small hexagonal head, an internally formed external thread portion of a certain outer diameter and length on the opposite side, then an intermediate unthreaded body portion of the same diameter, and the end has the shape of an external thread portion of a certain outer diameter and length, the thread pitch and outer diameter of the threaded portions formed on both sides are equal, and the overall length takes into account the position of the nut tightening portion machined into the top and bottom of the girder, the so-called length from the end of the girder that is in contact with the column surface to the same position, and the length for fitting with the internal female thread of the internal threaded lag screw bolt at both ends, the size of the diameter of the through column,This double-threaded bolt with a small hexagonal head on one end can be adapted to various lengths and outer diameters depending on the girder height, etc. Furthermore, the lag screw bolts with internal threads at both ends that engage with this bolt are selected according to the specifications of the bolt's threaded portion. In addition, to assist in maintaining the load-bearing capacity of the joint between the through-column and the girder during an earthquake, a shear shaft (pipe) is installed on the girder side beforehand. After the girder is in contact with the through-column, a drift pin is driven into the column to fix the column and girder. Then, the double-threaded bolt with a small hexagonal head on one end and the internal female threads of the lag screw bolts with internal threads at both ends are engaged and tightly fastened, and secured with a hexagonal nut. This allows for efficient and quick work, improving safety during work at heights and maintaining the load-bearing capacity of the building structure over the long term.

Intramedullary aiming systems, instruments, and methods of treating bone fractures are provided. The aiming systems may include one or more instruments configured to ensure optimal alignment and placement of one or more components of an intramedullary nailing system, such as anteversion alignment, anti-rotation, lag screw aiming, distal aiming, and other instruments suitable to enhance and optimize the surgical procedure.

Intramedullary aiming systems, instruments, and methods of treating bone fractures are provided. The aiming systems may include one or more instruments configured to ensure optimal alignment and placement of one or more components of an intramedullary nailing system, such as anteversion alignment, anti-rotation, lag screw aiming, distal aiming, and other instruments suitable to enhance and optimize the surgical procedure.

The invention discloses a novel intelligent steel plate screw internal fixing device and method.The novel intelligent steel plate screw internal fixing device comprises connecting steel plates, the connecting steel plates comprise straight plates and different plates, the connecting steel plates are provided with at least two screw holes in the length direction, concave-convex textures are arranged in the circumferential directions of the screw holes, and the two connecting steel plates are matched with each other through the concave-convex textures to limit relative rotation; the connecting screws comprise locking screws and lag screws, connecting holes are formed between adjacent screw holes, connecting parts are arranged on the supporting pieces and used for connecting the connecting holes, the supporting pieces are made of degradable materials, the modularized connecting steel plates are matched with the connecting screws to achieve an internal fixing system, and splicing type dynamic fine adjustment of the connecting steel plates and the connecting screws is achieved. The internal fixation shape and size can be flexibly adjusted according to different actual fracture conditions, so that the internal fixation device is suitable for various fracture types, especially complex or irregular fractures, and more accurate fixation force is provided for fracture parts.

The present invention relates to a bio-resorbable calcium composite lag screw to achieve compression in small bone fractures. The design features allow for reliable insertion reducing the risk of fracture by having an internal geometry of the screw wherein an inserter or driver used to insert the screw applies force only to the threaded portion of the screw distal from the inserter or driver, reducing the risk of screw breakage on insertion.

This invention provides wooden member connecting members, wooden seismic-resistant members, and high nuts and lag screw bolts that constitute them, which are less prone to buckling than conventional materials. [Solution] The device comprises a bolt 1 that engages with a gusset plate 9, a lag screw bolt 5 fixed to the bottom 4a side of the pilot hole 4 and having a hollow portion 55 that opens to the rear end 54 of the screw, a rod 6 having first threaded portions S1 and second threaded portions S2 at both ends 6a and 6b that screw into a high nut 7 and the lag screw bolt 5, and an expandable portion E extending between them, and a high nut 7 that screws into the bolt 1 and the rod 6, all arranged coaxially Q with the pilot hole 4. The high nut 7 or the lag screw bolt 5 has a non-threaded portion N within the hollow portions 71, 55 that allows displacement of the expandable portion E in the axial direction Z. The high nut 7 has a length L longer than the maximum assumed extension length MAX of the expandable portion E inserted into the pilot hole 4, and its displacement direction is constrained to the axial direction Z by the inner surface 4d of the pilot hole 4.

The invention discloses a drilling guider, and relates to the technical field of medical instruments, the drilling guider comprises a main body, a slide block and a guide sleeve, the slide block is in sliding fit with the main body, the guide sleeve is in sliding fit with the main body and the slide block, the slide block is provided with a parallel guide slide block, an angle guide slide block A and an angle guide slide block B, the guide sleeve is provided with a first guide sleeve and a second guide sleeve, the first guide sleeve is used for positioning the distance between the main body and the bone, the second guide sleeve is generally used for the second guide hole A, the second guide hole B and the second guide hole C, the guide sleeve is used for guiding the kirschner wire, and the hollow lag screw is driven in through the kirschner wire after the kirschner wire is driven in.

To provide intramedullary aiming systems, instruments, and methods of treating bone fractures.SOLUTION: Aiming systems may include one or more instruments configured to ensure optimal alignment and placement of one or more components of an intramedullary nailing system, such as anteversion alignment, anti-rotation, lag screw aiming, distal aiming, and other instruments suitable to enhance and optimize the surgical procedure.SELECTED DRAWING: Figure 1

The invention discloses a cervical vertebra hollow lag screw for operative treatment, and belongs to the field of medical instruments, the cervical vertebra hollow lag screw comprises a screw seat, a screw seat and a lag screw, the upper end of the screw seat is provided with a U-shaped groove for accommodating a fixing rod, and a spherical notch for preventing the screw head from being separated from the lower end of the screw seat is arranged between the screw head and the screw seat; a hexagonal hole is formed in the screw head in the axial direction, a first through hole penetrating through the lag screw is formed in the lag screw in the axial direction, and the hexagonal hole is larger than the first through hole in size. Wide threads are arranged at the end, away from the screw head, of the surface of the screw body, narrow threads are arranged at the end, close to the screw head, of the screw head, and the thread pitch of the wide threads is two times that of the narrow threads. And no thread is arranged between the wide thread and the narrow thread. Two ends of a fracture can be lifted and pressurized, the U-shaped nut is arranged on the rear portion, the thread is arranged close to the nut, and after the U-shaped nut and the connecting rod are fixed together, an injured vertebral body and an adjacent vertebral body can be fixed together, and the effects of pressurizing the fracture end and fixing the fracture end and the adjacent vertebral body are achieved.

To provide a method for constructing a lag screw bolt, which facilitates burying work of burying a large-sized lag screw bolt, which applies a large load to a burying tool, into a prepared hole.SOLUTION: A fixed lag screw bolt P1 that is shorter than a predetermined length is buried on a bottom side of a prepared hole Q1. Then, a coupling lag screw bolt P2 with an axial center part passing through is buried. A lag screw bolt P of the predetermined length is constructed in the prepared hole Q1. A fixed bolt R is fixed to the fixed lag screw bolt P1. The lag screw bolt P of the predetermined length buried in the prepared hole Q1 is integrated.SELECTED DRAWING: Figure 1

A fracture fixation system includes a fixation element having a plate and a barrel. The plate has an outer surface and an inner surface for placement against an exterior surface of a bone, and the barrel extends along a barrel axis and has a peripheral wall protruding from the inner surface of the plate. The fixation element defines first and second passages through the plate and the barrel that each extend along the barrel axis. The fracture fixation system further includes a first lag screw extending from a proximal end to a distal end and configured to be inserted through the first passage defined by the plate and the barrel. The fracture fixation system further includes a second lag screw extending from a proximal end to a distal end and configured to be inserted through the second passaged defined by the plate and the barrel.

The invention discloses an intramedullary nail for outer side wall smashing type femoral intertrochanteric fracture, and belongs to the field of medical instruments, the intramedullary nail comprises a main nail, the main nail is connected with a tension bolt through a duct adjusting mechanism, and the main nail is provided with a lock nail; the hole channel adjusting mechanism is arranged on the main screw and used for adjusting the neck-shaft angle of the lag screw, the hole channel adjusting mechanism adjusts and changes the installation angle of the lag screw on the main screw through the structure of the hole channel adjusting mechanism, and then adjustment of the neck-shaft angle of the lag screw is achieved. The lag screw can cross the outer side wall to crush a fracture line, the problem of supporting failure caused by the fact that the screw penetrates through the fracture line in traditional fixation is avoided, meanwhile, the tip end of the lag screw is more accurately embedded into a main pressure bone small beam column (PCS) at the proximal end of the femur, and the holding force of the screw to the femoral head is improved; the main nail and the femoral shaft are tightly fixed through transverse locking, and rotation and axial displacement of the main nail in the medullary cavity are limited.

The gear dismounting device for the vehicle-mounted screw air blower comprises a puller assembly, a tension supporting plate and a lag screw, the puller assembly is provided with a first connecting plate, a second connecting plate and a tension plate, the first connecting plate is rotationally connected with the second connecting plate, the second connecting plate is rotationally connected with the tension plate, and the tension plate is rotationally connected with the tension supporting plate. A hook-shaped structure is arranged on the tension plate and can be locked with the outer circumference of the end face of the tension supporting plate, an avoiding hole is formed in the middle of the tension supporting plate, a plurality of tension supporting holes are formed in the positions, located on the outer circumference side of the avoiding hole, of the tension supporting plate, and the inner diameter of the tension supporting holes is larger than the outer diameter of a screw rod of the tension screw. The inner diameter of the tension supporting hole is smaller than the outer diameter of a nut of the lag screw. When the dismounting device is used for dismounting the gear, the pulling force of the dismounting device acts on the end position of the gear, and in the dismounting process, the gear surface position of the gear cannot be touched, and the gear surface cannot be collided. The dismounting device can be widely applied to the dismounting work of the gear in the screw blower.

The utility model discloses an orthopaedic implant assembly which comprises an intramedullary nail, at least one threaded hole, at least one screw and at least one screw. The locking plate comprises at least one connecting hole and a plurality of locking holes; and the lag screw is provided with a threaded part, and the threaded part is connected with the threaded hole and the connecting hole so that the locking plate and the intramedullary nail can be connected together. The locking plate and the intramedullary nail are connected together through the lag screw, the lag screw and the intramedullary nail are stably connected through the threaded part, the locking plate can be supported, the situation that a steel plate is supported through a skeleton in practical application is reduced, recovery is facilitated, and therefore the problem that an implant fails is solved.

To provide a buckling-restrained brace that can effectively suppress the separation of restraining members even when the tensile force acting on the fasteners connecting the pair of restraining members during higher-order buckling of the core material causes the restraining members to separate. [Solution] The buckling-restraining brace 100 has a steel plate-shaped core material 10 and a wooden restraining body 20 formed by a pair of restraining members 30. The outer circumferential surface 31 of one restraining member 30A is provided with a plurality of countersunk grooves 34, and a first through hole 38 is provided that extends from each countersunk groove 34 to the contact surface 32. A lag screw bolt 50, equipped with male threads 51 and female threads 52, is embedded in the other restraining member 30B from the contact surface 32 to the interior, and a plurality of fasteners 60 are inserted through the corresponding first through holes 38 and screwed into the female threads 56.

The application discloses a femoral intramedullary fixation device, which comprises a main nail arranged in the femoral medullary cavity along the femoral axis, a lag screw arranged in the proximal end of the main nail and used for connecting the proximal end of the femur and the broken femoral head, and a stabilizing screw arranged in the proximal end of the main nail and used for connecting the femoral head and arranged non-parallelly with the lag screw. The application can improve the early fixation effect of the femoral intramedullary fixation device, reduce the rotation and movement probability of the lag screw in the femoral neck, and effectively prevent the proximal end of the femur from turning inwards and other adverse effects by arranging the lag screw non-parallelly with the stabilizing screw.

A fracture fixation system includes an implant defining a transverse bore extending along a bore axis, the bore being defined by first and second passages that each extend along the bore axis. The fracture fixation system further includes a lag screw configured to be inserted through the second passage, wherein a distal portion of the lag screw includes a thread. The fracture fixation system further includes a bolt configured to be inserted through the first passage, wherein a lateral side of the bolt defines a negative thread adapted to receive the thread of the lag screw. The negative thread includes a transition portion configured to align the thread of the lag screw with the negative thread of the bolt.

A femoral nail system comprises a femoral nail comprising an elongate body having a proximal end section extending along a central axis, a distal end section and an intermediate section extending therebetween, a lag screw hole located in the proximal end section for receiving a lag screw and a first anti-rotation screw hole located in the proximal end section for receiving a first anti-rotation screw, and a lag screw configured to be inserted into the lag screw hole, the lag screw comprising a second anti-rotation screw hole for receiving a second anti-rotation screw, wherein the elongate body is configured to be inserted into an intramedullary canal of a femoral bone to stabilize a femoral fracture, and wherein the lag screw is configured to be inserted into the lag screw hole to intersect a femoral head of the femoral bone to stabilize a femoral head fracture.

A bioabsorbable lag screw 8 able to compress two fracture fragments together, comprising a body having a threaded outer section 10 and an axial longitudinal opening 16 extending therethrough. The opening comprises a square internal geometry at an internal position within the screw corresponding to the threaded outer section, the internal geometry extending between 20-100% of the length of the threaded outer section. The remaining length of the screw comprises a circular internal geometry. When rotational force is applied to the screw, it may be applied only to the threaded section via the square internal geometry. The screw may have a circular opening distal from the threaded section to allow an elongated cylindrical part of the driver to extend about 0.2mm from the opening. The screw may be 14-50mm in length. The screw may comprise or consist substantially of a bioabsorbable polymer.