97 results about "Lag screw" patented technology

Systems, devices and methods are disclosed for treating fractures. The systems, devices and methods may include one or both of an implant, such as an intramedullary nail, and a fastening assembly, such as a lag screw and compression screw assembly. The implant in some embodiments has a proximal section with a transverse aperture and a cross-section that may be shaped to more accurately conform to the anatomical shape of cortical bone and to provide additional strength and robustness in its lateral portions, preferably without requiring significant additional material. The fastening assembly may be received to slide, in a controlled way, in the transverse aperture of the implant. In some embodiments, the engaging member and the compression device are configured so that the compression device interacts with a portion of the implant and a portion of the engaging member to enable controlled movement between the first and second bone fragments. This configuration is useful for, among other things, compressing a fracture.

An intramedullary assembly for intraosseous bone fusion includes a lag screw member and a tapered screw member. The lag screw member includes a first elongated body, where the first elongated body includes a first threaded portion at a first end and a bulbous portion at a second end. The tapered screw member is coupled to the lag screw member, and the tapered screw member includes a second elongated body, where the second elongated body includes a second threaded portion at a third end, and an opening at a fourth end.

One method of reducing fractures in long bones is to insert an intramedullary screw through the bone canal across the fracture and deploy tangs to increase the purchase of the screw. Compression is then applied along the screw to bring the broken bone together. An improved low cost lag screw has a cannulated shaft with a shaped bore in the leading end. A similarly shaped tang body is movably disposed in the leading end bore. The tang body has several tangs laser welded about the periphery and extending from the tang body. The shaped surfaces of the bore have exit holes and the ends of the tangs are adjacent the holes. An end cap is laser welded to the leading end of the shaft.

An intramedullary assembly for intraosseous bone fusion includes a hybrid screw member and a lag screw member. The hybrid screw member is aligned along a longitudinal axis, and includes a first shaft, a threaded portion, and a head portion having a first internal surface of a first spherical radius and a second tapered internal surface of a second radius. The first internal surface is coupled to the second internal surface to enclose a bore extending through the head portion along a bore axis. The lag screw member includes a second shaft, a bulbous portion, and a threaded portion. The lag screw member is adapted to be inserted into bore and forms an acute angle with the longitudinal axis.

An intramedullary nail for insertion in the intramedullary canal of a long bone. The nail includes a nail body having a leading end, a trailing end, and a proximal diametral axis. The trailing end has an axial bore and an intersecting transverse slot. The transverse slot is adapted to pass a sleeve for a lag screw. The sleeve has a sleeve bore axis, and the transverse slot is adapted to provide alternative angles for the sleeve bore axis with respect to the proximal diametral axis. The nail includes a sleeve lock screw. The axial bore includes threads that are adapted to engage complementary threads of the sleeve lock screw. The axial bore is adapted to pass therethrough the sleeve lock screw to make contact with an upper surface of the sleeve when the sleeve is disposed within the transverse slot. A lower surface of the transverse slot and the sleeve lock screw restrict axial movement of the sleeve within the transverse slot and away from the leading end.

An orthopedic fixation system includes a compression plate member, a lag screw member, and a plurality of threaded screw members for applying compression across a fracture site. The compression plate member has a generally planar body, an upper surface, and bone contacting surface. The planar body includes a plurality of through-apertures and a hinged tab member having an elongated through aperture, which is adapted to receive the lag screw member and cause the tab member to recess towards a bone divot formed in the underlying bone. The compression plate member is also adapted to receive the plurality of screw members within the through-apertures for fixably and threadably coupling the compression plate member across a fracture site. The lag screw member applies a direct compressive force across the fracture site through the deformable tab that is recessed in the bone divot.

A hip plate, comprising: a plate body adapted to be attached to a femur or other bone; and at least one lag screw adapted for insertion into a femoral head or other bone protrusion and rotationally lockable to said plate.

A modification to the prototypical compression (dynamic or sliding) hip screw is described which expands the utility and surgical indications of this frequently used fracture fixation device to include the fracture pattern commonly referred to as a “reverse obliquity fracture” of the proximal femur. This fracture pattern is poorly secured with current generation hip screws, frequently necessitating the use of intramedulary fracture fixation devices or external fixation hardware. The described modification blocks telescopic sliding of the femoral head lag screw within the cylindrical barrel of the side plate and allows for secure locking of the lag screw within the side plate, preventing any relative motion between the screw and plate once fracture reduction has been achieved. In a locked mode, the proximal fracture fragment(s) is prevented from displacing laterally relative to the distal (diaphysial) fragment, as occurs commonly when a reverse obliquity fracture or a comminuted intertrochanteric femur fracture is fixed with a conventional hip screw. No change in routine fracture reduction or insertion technique is required to use the Locking Compression Hip Screw. Additionally, the described modification does not preclude use of the Locking Compression Hip Screw in a dynamic or sliding mode, if desired, when used to fix the more common femoral neck or intertrochanteric fracture patterns.

A compression bone screw device for fixating a fractured bone. The device includes a constant compression lag screw, a side plate having a moveable rollerball for receipt of the lag screw and a compression member engageable with the lag screw and rollerball to impart a constant compressive force across the bone fracture.

An intramedullary fixation assembly for bone fixation includes a first construct. The first construct includes a first tapered screw member fixated into a subchondral bone. The first tapered screw member is aligned along a first longitudinal axis and has a first head portion comprising a first aperture and a first shaft extending from the first head portion. Moreover, the first longitudinal axis of the first tapered screw member is aligned substantially parallel to an articular surface of a bone. The first construct also includes a first lag screw member aligned along a second longitudinal axis. The first lag screw member has a first bulbous portion and a second shaft extending from the first bulbous portion, wherein the first lag screw member is coupled to the first tapered screw member, and further wherein the second longitudinal axis of the first lag screw member is aligned generally along the length of the bone.

There is provided a spinal implant device for placement between adjacent spinous processes. The spinal implant device includes first and second fixation plates, a connector, and first and second lag screws. The first fixation plate includes a first and second screw holes. The second fixation plate includes third and fourth screw holes. The first lag screw extends through the first and third screw holes and threadedly engages a respective one of the first or third screw holes with the superior spinous process disposed between the first and second superior ends. The second lag screw extends through the second and fourth screw holes and threadedly engages a respective one of the second or fourth screw holes with the inferior spinous process disposed between the first and second inferior ends. A method of implanting the device is provided.

An elongated modular implant is provided which has a distal part and a proximal part both having a leading end and a trailing end, respectively. The trailing end of the distal part includes a tool engagement portion and the leading end of the proximal part includes a distal part engagement portion for an engagement with the tool engagement portion of the distal part. The implant further includes an assembly element for firmly coupling the distal part and the proximal part when the first tool engagement portion of the distal part engages the distal part engagement portion of the proximal part. The proximal part trailing end may also have a tool engagement portion identical to the trailing end of the distal part.

Treating fractures using one or both of an implant, such as an intramedullary nail, and a fastening assembly, such as a lag screw and compression screw assembly. The implant in some embodiments has a proximal section with a transverse aperture having a non-circular cross-section that may be shaped to selectively constrain the fastening assembly within the transverse aperture. Two or more components of the fastening assembly may be received to slide, in a controlled way, in the transverse aperture of the implant, and to cooperate to resist a force moment applied thereto. Without the presence of one of the components, such as the lag screw, another component, such as the compression screw may not resist a force moment applied thereto. In some implementations, an engaging member and a compression device of the fastening assembly are configured so that the compression device interacts with a portion of the implant and a portion of the engaging member to enable controlled movement between first and second bone fragments. This configuration is useful for, among other things, compressing a fracture.

A manufacturing method for a posterior column lag screw 3D navigation module used for acetabulum fracture comprises the following steps that A, according to simulation reestablishing, 3D reestablishing is performed according to pelvis thin layer CT scanning data of an object with the acetabulum fracture so as to obtain an original 3D reestablished model, on the basis of the original 3D reestablished model, fracture block division is performed along the fracture line, and the femur head is removed so as to obtain a fracture block separation model, and on the basis of the fracture model, a single fracture block 3D space position is adjusted to recover the normal anatomic form of the acetabulum, so that a fracture reduction model is obtained; B, according to virtual posterior column slag screw implanting simulation, on the basis of the fracture reduction model, a posterior column slag screw implanting fracture reduction model is simulated with a cylinder on the fracture reduction model; C, according to obtaining of a navigation module simulation body, the navigation module simulation body is established according to the cylinder, so that the navigation module simulation body with screw channels is obtained; D, the navigation module is obtained through 3D printing. The manufactured navigation module has the advantages that the manufacturing technology is simple, precision is high, and safety is good.

An external fixator implant screw with an intercalated head, of which one embodiment for lag screw mode has a spherical head, and a partial thread. The spherical head in countersunk bone exerts concentric wide contact on insertion at various angles to surface. Optional canalization of central rod allows guide wire technique and optional mobility of head allows variable shaft length between head and thread. Another embodiment for use in basic implant mode, in a single bone fragment, at right angles to bone surface, has a conical head with limited basal contact on bone, the head being integrated to a solid rod and is fully threaded from head to leading tip. In both embodiments, the load transmission is renewable from outside in case of loosening, without reopening any wound. The implant is made of biocompatible material.

The invention relates to a minimal invasive combined pressurizing and locking bone fracture plate for trochanter comminuted fracture and femoral neck fracture. The bone fracture plate comprises a trochanter rear-side fixing plate and a femoral proximal-end fixing plate, which are connected into an integrated structure for respectively covering the trochanter rear side and femoral proximal end in an annular shape, wherein first locking holes are respectively formed on two ends of the trochanter rear-side fixing plate, and first locking nails which penetrate the rear side of the trochanter crown head end and the rear side of the trochanter crown bottom end are locked in the two first locking holes respectively; three second locking holes, arranged in a regular triangle way, are formed on the femoral proximal-end fixing plate, a second locking nail for locking femoral trochanter, femoral neck and bulb penetrates at least one second locking hole; and the trochanter rear-side fixing plate and the femoral proximal-end fixing plate are connected into an integrated structure for covering the trochanter rear side and femoral proximal end in an annular way. By utilizing a ball lag screw or a locking lag screw, tensioning of the trochanter, the femoral neck and the bulb and positioning lock on the femoral diaphysis are realized, so the minimal invasive combined pressurizing and locking bone fracture plate for the pulverous trochanter fracture and femoral neck fracture has the advantages of simpleness in operation, small cut, good fixing effect, firm tensioning, no potential safety hazards in long term use, no deformation and good treatment effect and is beneficial to accurate diaplasis.

The invention discloses a hollow lag screw guide pin aiming fixator for restoration of lesser trochanter of a thigh bone from a rear side. The hollow lag screw guide pin aiming fixator for restoration of lesser trochanter of the thigh bone from the rear side comprises an arc guide frame, wherein a restoration rack is arranged at one end of the arc guide frame; a combined sleeve which moves along the arc guide frame is arranged at the other end of the arc guide frame; the tail end of the restoration rack is connected with the arc guide frame; a restoration hook is arranged at the front end of the restoration rack; a limiting groove is formed in the restoration rack; the combined sleeve comprises an outer barrel and an inner barrel; the inner barrel moves in the outer barrel coaxially; pointed claws are respectively arranged at an outlet end of the inner barrel and an outlet end of the outer barrel; and when the combined sleeve moves along the arc guide frame, the pointed claws are always pointed to the circle center of the arc guide frame. during surgery, the hollow lag screw guide pin aiming fixator for restoration of lesser trochanter of the thigh bone from the rear side is inserted from the rear side, muscles are pushed away by the front arc-shaped restoration rack, the restoration hook hooks a fracture block of the lesser trochanter and drags to the rear lower direction, sliding of the aiming fixator can be avoided by the square limiting groove, and therefore, the restoration effect is direct and reliable.