213 results about "Fracture site" patented technology

An axial intramedullary screw having a straight cylindrical outer surface for the operative treatment of long bones, the screw having two tips and a screw thread extending between the tips. At each of the tips there is a connection portion for screwdriver. The screw thread is used for cutting into the cortical bone of the medullary canal and due to the screwdriver connection at both ends it can be driven from either end through the cortical bone. This allows a method to be used in which the screw is threaded into one portion of a bone fragment and then after connecting a further bone fragment at the fracture site, screwed in a different direction into that further fragment. The screw also includes a transverse screw hole at one or both ends for the passage of an interlocking transverse screw therethrough.

A system for percutaneous fixation and stabilization of a fracture with a spanning, expandable structural frame placed in the intramedullary canal of the bone, comprising a column of surgical fluid such as bone cement, within which the structural frame acts as a reinforcing cage, and a sheath positioned at the fracture site and at least partially surrounding the frame and fluid. The fluid may be supported by a restrictor and may be agitated with a vibrating probe to remove entrapped air. The structural frame may be self-expanding or opened by an internal force, and it may be retrievable. The frame, fluid, or sheath may contain antibiotics, pharmaceuticals, or other therapeutic compounds to be delivered to the fracture site.

The present invention provides bone fracture fixation devices, systems and methods of use and manufacture. One such bone fixation device includes an elongate element having a responsive zone. The element is adapted to be coupled to the bone so that the responsive zone is positioned adjacent a fracture site in the bone. The responsive zone is adapted to apply a desired pressure to the bone when coupled thereto. In some embodiments, the responsive zone comprises a shape memory material, which may be nickel titanium or Nitinol, to apply compressive pressure across the fracture site for longer periods of time than standard bone screws.

The invention relates to a system for stabilizing a bone fracture and methods for applying the system. The system includes a device with two anchorable members with an intervening connector and a passageway through the device. The anchorable members have a constrained non-anchoring configuration and a released anchoring configuration. The anchoring configuration includes a radially-expanded structure such as a plurality of struts. After implantation across a fracture site, the anchorable members are released from their linearly constrained configuration, and structural features radially self-expand, anchoring the device across the fracture. A flowable bone-filling material may be conveyed into the passageway of the device after implantation. The composition fills the space within the expanded structures of the anchorable members and flows into space surround the device, stabilizing it further in the implantation site.

Apparatus for the fixed-angle fixation and compression of a fracture site or osteotomy of a bone includes a bone plate having a plurality of holes and bone screws with a threaded head. The bone screws accommodated in the holes are screwed into the bone. At least one of the holes is a combination of two circular holes of different diameter. As screwing of the bone screw into the bone proceeds through a final stage, engagement of the threads on the head with threads in the combination hole effects relative longitudinal displacement between the plate and the bone whereby it is possible to simplify simultaneous fixed angle fixation and compression of the fracture or osteotomy with use of a single screw. Threads on the head of the bone screw engage threads in the hole which is a combination of the two hole to effect relative motions.

A fracture fixation implant formed from a single piece of material bent in loop form to provide juxtaposed first and second legs joined by a bend. The first leg is dimensional and configured to be implanted within a bone to extend across a fracture in the bone, the second leg extending backwardly from the bend and having a length to extend on an outer surface of the bone across the fracture. The implant exits from the bone at the bend, such that application of a pulling force on the second leg produces compression across the fracture. The second leg is flat and is provided with a plurality of holes in which bone screws can be installed to secure the second leg directly to the bone and maintain the compression across the fracture. The implant avoids the use of washers.

An external fixator includes a main body and an outrigger for extending over a fractured joint, such as a wrist joint. The main body can be positioned next to a right arm, or flipped over and positioned next to a left arm. The outrigger is attachable to extend either to the left or to the right of the main body, as appropriate. A distal body is removeably connectable to the distal end of the main body, and the distal body can be affixed to bone on the opposite side of the fracture to immobilize the joint where the fracture occurs. The distal body is connected to the main body with an adjustable securement section which provides six degrees of adjustment freedom. The outrigger is attached to the main body through a slide plate in a dual rail configuration which provides two dimensions of adjustment. Fragment pin supports ride in a track of the outrigger, and provide seven degrees of adjustment freedom for directed fixation of fragments at the fracture site. The outrigger is pivotally adjustable relative to the main body, and includes track portions separated by a wrap around angle. The major components of the fixator are molded of plastic. A surgical technique using the fixator includes immobilizing the joint for an initial healing duration and retaining fragment pins in place during a secondary healing duration.

Reduction of a bone fragment of a bone fracture at a bone fracture site is accomplished through a minimally invasive access passage utilizing instruments having a working head actuated from a location remote from the bone fracture site, between an insertion configuration dimensioned and configured to present a minimal cross-sectional area for ready passage through the minimally invasive access passage and a working configuration dimensioned and configured to establish an essentially rigid working face of substantially greater cross-sectional area than the minimal cross-sectional area. The working head is actuated into the working configuration and manipulated from the remote location while in the working configuration to engage the working face with the bone fragment and manipulate the bone fragment into an anatomically appropriate reduced position at the bone fracture site.

A bone plate for the compression of a fracture site or osteotomy of a bone includes a bone plate body having a plurality of screw holes and bone screws accommodated in the screw holes. At least one of the screw holes is teardrop shaped having a wide portion and a narrow portion. The bone screw selected for use in the screw hole can be either a locking screw or a non-locking screw, as the screw hole can accept both types.

An apparatus and method for treating a long bone fracture in the limb of an animal wherein a non-invasive technique is provided for intermittently inducing a shortening in length of the skeletal musculature surrounding the long bone, whereby a compressive force may be intermittently applied to the fractured bone. Suitably a radial inward force is applied substantially fully around the circumference to the limb, by an inflatable cuff or sleeve, that is transmitted to the surrounding muscles. Alternatively, electrical signals cause active contraction of the musculature. The treatment may include the application of about 55 to 65 compressions each day for at least 10 days, and commencing within about 7 days of the fracture being sustained. The compressions, applied with frequency in the range of 0.05 Hz to 2 Hz, are desirably just short of that which produces fracture site pain and the intensity of the compressions may be increased between treatment sessions, consistent with heating.

Fracture fixation devices and methods achieve stabilization of a bone fragment. A nail section of the device is dimensioned to be positioned within an intramedullary canal of a bone such that the nail section spans a fracture site in the bone. The nail section bends into a post-insertion configuration different from a pre-insertion configuration when inserted into the intramedullary canal. The nail fastening section is connected to the nail section by a connecting element on a first side of the fracture site. At least a portion of the nail fastening section is positioned outside the bone. A first end of the nail section and a second end of the nail fastening section are positioned on an opposite second side of the fracture site when the fracture fixation device is implanted in the bone.

A method and devices for facilitating fixating and joining of bone fractures utilizing expandable devices that are positioned within the bone and across the fracture site. The stress from the expanded devices may enhance and expedite bone healing.

A fracture fixation implant formed from a single piece of material bent in loop form to provide juxtaposed first and second legs joined by a bend. The first leg is dimensional and configured to be implanted within a bone to extend across a fracture in the bone, the second leg extending backwardly from the bend and having a length to extend on an outer surface of the bone across the fracture. The implant exits from the bone at the bend, such that application of a pulling force on the second leg produces compression across the fracture. The second leg is flat and is provided with a plurality of holes in which bone screws can be installed to secure the second leg directly to the bone and maintain the compression across the fracture. The implant avoids the use of washers.

Surgical instruments and procedures are disclosed that enable the injection of an optimal amount of curable resin and / or the placement of an internal fixation device in an intramedullary canal of a fractured bone. The disclosed instruments and procedures enable a surgeon to clear a portion of the canal of cancellous bone and marrow across the fracture site without damaging the cortical wall.

A method and apparatus are disclosed for treating bone fractures by the application of intermittent pneumatic compression. The period of compression is sufficient to induce venous stasis at the fracture site. The period of recovery can be about half the period of compression. The applied pressure can be in the range os about 25–60 mmHg.

An intramedullary nail for fixation and stabilization of a fractured bone that also allows for a controlled amount of longitudinal motion at the fracture site to encourage bone remodeling and healing is described. The intramedullary nail has a proximal portion and a distal portion that are coupled together in a manner by a biasing assembly that provides for a controlled movement of the proximal and distal portions relative to each other so that when a patient puts pressure on the bone, such as when walking, the fracture site compresses and the bone ends move together, and when the pressure is released from the bone, the bone ends are biased apart by a controlled amount.

An apparatus and method of monitoring healing and / or assessing mechanical stiffness of a bone fracture or the like is disclosed. The method comprises (a) recording a strut length of a variable length strut with an indicator pin, wherein the strut is on an external fixator is in a no or minimal load situation; (b) inputting such strut length, mounting parameters, and frame parameters into software to determine a first pose and position of the fixator; (c) positioning at least one indicator clip on each side of the indicator pin; (d) applying a load or torque to the bone fracture; (e) recording strut length of the variable length strut in loaded situation; (f) inputting such strut length, mounting parameters, and frame parameters into software to determine for a second pose and position of the fixator in a loaded situation; (g) solving for a change in pose and position by subtracting the second pose and position from the first pose and position; and (h) solving for the stiffness of the bone fracture by dividing the load applied to the bone fracture by the change in position and pose. An apparatus and indicator clip are also disclosed.

An external fixator includes a main body and an outrigger for extending over a fractured joint, such as a wrist joint. The main body can be positioned next to a right arm, or flipped over and positioned next to a left arm. The outrigger is attachable to extend either to the left or to the right of the main body, as appropriate. A distal body is removeably connectable to the distal end of the main body, and the distal body can be affixed to bone on the opposite side of the fracture to immobilize the joint where the fracture occurs. The distal body is connected to the main body with an adjustable securement section which provides six degrees of adjustment freedom. The outrigger is attached to the main body through a slide plate in a dual rail configuration which provides two dimensions of adjustment. Fragment pin supports ride in a track of the outrigger, and provide seven degrees of adjustment freedom for directed fixation of fragments at the fracture site. The outrigger is pivotally adjustable relative to the main body, and includes track portions separated by a wrap around angle. The major components of the fixator are molded of plastic. A surgical technique using the fixator includes immobilizing the joint for an initial healing duration and retaining fragment pins in place during a secondary healing duration.

A method of treating a fractured vertebral body by using a) a plurality of reinforcement rods combined with the b) a bone growth agent, wherein the reinforcement rods act to mechanically join disparate bone fragments across the fracture planes, thereby stabilizing the fracture site, and the bone growth agent promotes the growth of new bone across the fracture planes, thereby permanently replacing the fracture site with new bone.

Embodiments of the present invention provide rotationally asymmetric bone screws. Embodiments of the present invention provide mechanisms that reduce the bending stiffness of conventional shaft bone screws in order to yield a less-rigid fixation construct. Such a less-rigid construct enables a controlled amount of motion at a fracture site which in turn promotes bone healing. As a means to reduce the bending stiffness of positive-locking bone screws, embodiments of the present invention provide a bone screw having a non-circular cross-section over parts of the screw length and / or longitudinal slots along at least a portion of the bone screw.

The invention discloses an in vivo degradable and absorbable metal encirclement device for bone fracture internal fixation, which consists of a single claw-shaped fixing part, or a plurality of claw-shaped fixing parts and connecting plates combined together alternately. The encirclement device is prepared from a degradable metal material. The encirclement device tightly encircles a bone fracture part through a fixed claw to realize engagement alignment of broken bones; the connecting plates of the encirclement device connect the claw-shaped fixing parts together to form a shape matched with that of a bone. When the bone fracture part is healed up, the connecting plates of the encirclement device are degraded gradually, and when the bone fracture part has the mechanical strength of a normal bone, claw-shaped fixing ends of the encirclement device lose the fixing effect, become fragments coated by muscles and fibrous tissues and finally are completely absorbed by an organism. On the premise of meeting the fixing effect of a magnesium alloy bone plate, the encirclement device can greatly improve the treatment effect of the magnesium alloy bone plate without using wedge-type fixing ends such as magnesium alloy bone pegs and the like, and simultaneously, the magnesium alloy bone plate is not needed to be taken out through a secondary operation, so that pains of the patient are alleviated and postoperative long-term risks of the patient are reduced.

Apparatus for the fixed-angle fixation and compression of a fracture site or osteotomy of a bone includes a bone plate having a plurality of holes and bone screws with a threaded head. The bone screws accommodated in the holes are screwed into the bone. At least one of the holes is a combination of two circular holes of different diameter. As screwing of the bone screw into the bone proceeds through a final stage, engagement of the threads on the head with threads in the combination hole effects relative longitudinal displacement between the plate and the bone whereby it is possible to simplify simultaneous fixed angle fixation and compression of the fracture or osteotomy with use of a single screw. Threads on the head of the bone screw engage threads in the hole which is a combination of the two hole to effect relative motions.

A bone plate system for repair of a proximal humeral head fracture, which includes a fixation plate having a main body and a depending alignment flange, a plurality of elongated compression screws to extend through the intact humeral head into the cortical bone of the fractured portion and a cover plate. With the fixation plate in place, fastened to the humerus, the cover plate is in turn fastened to the fixation plate and provides a defined amount of clearance in a region adjacent the heads of the compression screws to allow measured back-out of the screws upon settling of the fractured bone portion at the fracture site.

An implant for fracture fixation in which a wire element has one end installed in bone and an opposite end fixed externally to the bone to apply compression across the fracture wherein a guide system is provided for guiding a tip of the one end of the wire element into a pilot hole in the bone prior to producing compression across the fracture.

A surgical bone screw 1) and driver (31), and a method for using them for repairing an osteotomy or fracture. The screw has a shaft having a head (5) at its proximal end, screw threads (3) at its distal end and a compression member (7) between the head and the screw threads. In an embodiment, the threads are self-tapping and self-drilling, the head is polygonal, and the sides of the polygon are convex. The driver turns the screw until the threads cross a fracture site and the compression member contacts the proximal bone fragment. The threads and compression member draw the fragments together and leaves the head entirely clear of the bone surface. The screw is removed through a small incision. Tilting the driver to allow the socket to engage an inwardly extending lower portion of the head permits the driver to lift the screw out of the bone.

The invention belongs to the field of medical apparatus and instruments, and relates to a femoral shaft fracture internally fixing instrument, which comprises a lockable steel plate and an aiming assembly of the lockable steel plate, wherein the lockable steel plate comprises a steel plate, a single lock, a linkage lock and a lock nail; the aiming assembly comprises a single lock aiming fixator and a linkage lock aiming fixator; an auxiliary assembly bone nail, a bone nail hole positioning hook and a combined screwdriver. In the femoral shaft fracture internally fixing instrument, an arc which corresponds to the forward physiological curve of a femoral shaft is designed on the steel plate longitudinally; an arc which corresponds to the transverse diameter of the femoral shaft is designed transversely near a bone surface, so that the arc is put in the middle of the fracture position along an arc line of the femoral shaft to contact bones in a limited mode; and the lateral surface is circular arc curved surfaces which are distributed symmetrically and uniformly. The linkage lock strides over a fracture line on the inner side of the femoral shaft, and the single lock is away from the fracture line; and the aiming assembly is used for aiming, fixing, drilling and assembling, and is easy to operate. The femoral shaft has the advantages that the fixation is stable, postoperative additional fixation is avoided, functional exercise can be performed in early stage, and the union of fracture is facilitated, and internal fixtures are convenient to dismantle after union.

The invention provides a medical splint with a thermotropic shape memory function, which is used for fixing of human fracture positions and belongs to the field of bone fixation and polymer material processing. The medical splint comprises a splint main body and a temperature control system. The temperature control system can realize heating and temperature control of the splint main body, and make a splint shape memory layer be rapidly deformed to the best shape of the fracture position in an attached manner by using a fabric layer and a connecting layer at the temperature of thermal deformation, and then fast cooling and fixing are performed, and the splint also needs to be heated to the temperature of thermal deformation during dismounting, a connecting structure is detached, and the splint can be easily dismounted. The shape memory layer is made of environment-friendly non-toxic polymer materials. A foam insulation layer is made of environment-friendly non-toxic physical foaming materials. The medical splint has the advantages of light weight, high strength, convenient operation, accurate temperature control and capability of recycling.

A compression splint is provided for reduction, compression and stabilization of spinal, pelvic, and long bone fractures. The compression splint includes a plurality of plates selectively disposed at a plurality of positions of a fracture site; a plurality of inflatable cushions, each cushion positioned between respective plates of the plurality of plates and the fracture site; and a support means for supporting the plurality of plates and plurality of cushions compressively against the fracture site in three dimensions, Additionally, the plates of the compression splint can be adjusted, removed or additional plates added to further customize the compressive force applied to the fracture site.

The invention relates to a bone screw. The bone screw comprises a screw pole and a screw cap, the screw pole comprises a polish rod section and a screw rod section, a degradable material layer is compounded on the peripheral circumferential surface of the polish rod section, and the outer diameter of the degradable material layer is less than or equal to the large diameter of the screw rod section. The screw pole and screw cap are made of metal material; the degradable material layer is prepared from one or the polymer of polylactic acid, polyglycolic acid, poly trimethylene carbonate, polydioxanone and poly epsilon-caprolactone. Through operation, the bone screw is stable in fixing effect and avoided from sliding after the fracture part of a patient is fixed and before the degradable material layer is degraded; in the later degradation process of the degradable material layer and after the complete degradation of the degradable material layer, the bone moves slightly to stimulate the full healing of the bone, the achievement ratio of operation is improved, and the healing effect of the fracture part is better.