43 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

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 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.

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.

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.

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 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.

A trochanteric fracture nail system includes: a trochanteric fracture nail and a lag screw system adapted and configured for fixation medially through the trochanteric fracture nail. The trochanteric fracture nail includes: a substantially cylindrical wall defining a longitudinal bore; at least one lateral bore intersecting the longitudinal bore; and a detent on an inner surface of at least one of the at least one lateral bore. The lag screw system includes a lag screw and an interference member. The lag screw includes: an annular body defining a substantially hollow central bore; and a keel located along the annular body. The keel is adapted and configured to substantially lie within an outer profile of the annular body when in a neutral position. The interference member is adapted and configured to displace the keel radially to resist motion of the annular body by engaging with the detent of the trochanteric fracture nail.

An intramedullary (“IM”) nail and surgical technique or method. The IM nail includes a body including an opening for receiving a lag screw and a compression screw. The body further including one or more screw openings for receiving a bone screw. The surgical technique enables a surgeon to selectively prevent or allow movement (e.g., medialization) of the IM nail within the patient's intramedullary canal. The position of the IM nail can be selectively secured within the patient's intramedullary canal depending on surgeon preference and / or depending on the fracture pattern being treated. In use, the surgeon can elect to either secure the position of the IM nail within the patient's intramedullary canal thereby preventing movement (e.g., medialization) of the IM nail within the patient's intramedullary canal, or the surgeon can allow the IM nail to move (e.g., medialize) within the patient's intramedullary canal.

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.

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.

An internal fixing device for femoral neck fracture is characterized by comprising a sleeve, a hollow lag screw, an anti-rotation inserting nail and a tail cap, the hollow lag screw is connected into a center hole of the sleeve, and the hollow lag screw is connected with the anti-rotation inserting nail in a matched mode. The anti-rotation insertion nail and the hollow lag screw are in threaded connection with the tail cap, center threaded holes are formed in the center of the anti-rotation insertion nail and the center of the hollow lag screw, and the anti-rotation insertion nail and the hollow lag screw are in threaded connection with the tail cap. The risks of breakage and looseness of the fixing device are reduced; the fixing device designed by the utility model can effectively hold a fracture broken end, the anti-rotation insertion nails in four directions can be mutually engaged with the hollow lag screws, and the anti-rotation insertion nails are in an open state at the inner fixing far end, so that the effect of preventing a bone block from rotating is realized.

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.

The present invention provides a tension screw and a femoral intramedullary nail, belonging to the technical field of orthopedic implants. The tension screw comprises a nail body and a sleeve, one end of the sleeve being sleeved onto the nail body. The nail body comprises a main body and a truncated cone, a step being provided between the truncated cone and the main body, and an elastic ring sleeved on the truncated cone. The elastic ring can abut against the step. When not subject to external force, the inner diameter of the elastic ring is greater than the diameter of the small end of the truncated cone, and the thickness of the elastic ring is greater than the gap between the sleeve and the large end of the truncated cone. The outer surface of the elastic ring is provided with multiple rows of first teeth, and the inner wall of the sleeve is provided with multiple rows of second teeth, and the first and second teeth are capable of meshing. When the nail body is subjected to an oblique downward force, the elastic ring contracts under the pressure of the second teeth of the sleeve and slides obliquely downward with the nail body. When the nail body is subjected to an oblique upward force, the elastic ring is restricted by the second teeth of the sleeve and cannot move, and the nail body slides obliquely upward until the elastic ring is squeezed by the sleeve and the large end of the truncated cone.

The present invention discloses a femoral neck plate nail system, including a fixing member and a tension screw, wherein the fixing member is provided with three directional holes arranged in a triangle, and the directional holes are used to install the tension screws in a one-to-one correspondence; wherein a first groove is provided on the head of the tension screw, and an elastic member is provided in the first groove, and the elastic member protrudes radially from the first groove when in a natural state, and the elastic member can be completely retracted into the first groove when squeezed; a second groove is provided on the inner wall of the directional hole, and the directional hole has an interference fit with the head, and the second groove has a clearance fit with the head, and when the tension screw is installed in the directional hole, the second groove accommodates the head and the elastic member protruding from the first groove. The femoral neck plate nail system provided by the present invention can prevent rotation and withdrawal of the nail, and has both reliable resistance to torsion, shear and pressure, and the ability to apply pressure for continuous axial sliding.

A fracture fixation system includes an intramedullary nail having a lag screw bore extending along a lag screw bore axis and a cannulated channel extending along a cannulated channel axis and in communication with the lag screw bore, the lag screw bore axis and the cannulated channel axis extending transverse to each other, a threaded lag screw configured for insertion within a first portion of the lag screw bore, a bolt configured for insertion within a second portion of the lag screw bore, a compression screw extending within the bolt, and a set screw configured for insertion into the cannulated channel and into engagement with the compression screw and / or the bolt.

The utility model provides an acetabulum front and back column through the acetabulum bottom horizontal line pull screw setting device, including the base plate, the upper surface rotationally connected with the guide piece of base plate, the base plate and guide piece are equipped with the mutual adaptation's guide channel, the guide channel can pass through the guide needle, the outside surface of guide piece is connected with the positioning structure for the close contact of ischial obturator outer edge, and the positioning structure is equipped with the adjusting part that can adjust the distance between positioning structure and guide piece, because the patient's anatomical structure has individual difference, the size, shape, front and back column's spatial position relation etc. of different patient's acetabulum are not exactly the same, the distance between adjustable positioning structure and guide piece, can make the setting device better close patient's specific acetabulum form, improve the accuracy and safety of screw setting, reduce the setting deviation caused by individual difference.

The invention discloses a locking steel plate for tibial plateau posterior lateral fracture and a fixing method. The steel plate comprises a near-end C-shaped structure, a middle-section transition part and a far-end extension part, the C-shaped structure bypasses a fibula head to achieve surrounding and fixing of a posterior-lateral fracture block, and by combining the 30-degree angle adjusting capacity of a universal screw, the adaptability of complex fractures is remarkably improved. A biomechanical test shows that the displacement resistance and the torsion resistance of the steel plate are superior to those of a traditional L-shaped steel plate and a lag screw. According to the design, only a single incision is needed on the front side and the outer side, operation risks are reduced, the recovery period is shortened, and the device is suitable for clinical treatment of tibial plateau lateral column and posterior lateral column combined fracture.