Device for posterior spinal fusion
The invention relates to medicine, namely to neurosurgery and traumatology, and can be used in operations on the spine fractures, sprains and dislocations fractures of the vertebrae. The invention provides reliable fixation of the vertebrae, reduced morbidity, ease of fabrication and installation on the vertebra. Device for posterior spinal fusion is made from a material with shape memory, contains two brackets with work items, hangers and hooks connected to each other by jumper. Work items of each of the brackets made in the form of open rings of the same diameter. The jumper is located in the same plane with the sides of both brackets and represents an arc in the form of a convex semicircle. 3 Il.The device relates to medicine, namely to neurosurgery and traumatology, and can be used in operations on the spine fractures, sprains and dislocations fractures of the vertebrae.The number of known devices made from materials with shape memory intended for fixation and stabilization of the damaged vertebral motor segments. One of the devices (patent RF №2089124, And 61 In 17/68) is a steel wire with DWI jumper. The device is applied, as a rule, for fixation of adjacent vertebrae.Disadvantages of analogue:1. The device provides a rigid (not dynamic) fixation of the vertebral motor segments, with an exact correspondence of the geometric parameters of the device size rear structures of the spine.2. For a snap-in system devices on the arms of the upper vertebral fixing elements in the form of closed loops, which when installed is conducted under the discs and can cause damage to the spinal cord.These drawbacks lead to restriction indications of using this device and to a complication of surgery.The closest to the technical nature of the claimed is a device for posterior spinal fusion, selected as a prototype (patent RF №2139008, And 61 In 17/70). This device is made from a material with shape memory, includes two parallel brackets having one working element in the form of a single-turn helix, located in the plane perpendicular to the plane of the brackets, and the brackets are connected by a jumper, representing polutoravekovuyu spiral. The disadvantages of the prototype:1. Does not provide a secure fit due to th geometric dimensions before installation i.e. the design of the working elements in the form of a single-turn helices does not allow to increase significantly the length of the device, which is a limitation of the use of the prototype or requires additional manipulation during installation during operation.2. When the jumper setting as polutoravekovoj spiral on the spinous process of the lower vertebra is necessary to find an appropriate geometry device for posterior spinal fusion, or hold additional manipulation of bone structures, which increases the invasiveness of the surgery.3. As a result of execution of work items as described, and the jumper is in the form of polutoravekovoj spirals increases the intensity of the device for posterior spinal fusion and the complexity of its manufacture.Object of the invention is a device for posterior spinal fusion for reliable fixation of the vertebrae, reduced morbidity, ease of fabrication and installation on the vertebra.This task is achieved by the fact that in the known device for posterior spinal fusion, made from a material with shape memory, containing two brackets with work items, hangers and hooks, sniny in the form of open rings of the same diameter, and the jumper is in the same plane with the sides of both brackets and represents an arc in the form of a convex semicircle. Reliable samopoczucia device on the spine is achieved through a metered and uniform compression, which is developing two similar work items, made in the form of open rings. The execution of work items is possible to change the height of the device within wide limits without effort, making the device a universal application. Through an arc performance jumpers and locating the center of rotation of the radius in the space between the straps is easy placement of the device under the spinous process.The invention is illustrated by drawings, where Fig. 1 shows a General view of the device of Fig. 2 is a side view, Fig. 3 shows a diagram of the installation of the device on the spine. The device consists of two identical brackets 1, each of which contains a work item 2, a shoulder 3, and the locking hook 4. Bracket 1 are interconnected arcuate bridge 5. The center of rotation 0 of radius R is located inside the device. The proposed device is made from wire with a diameter of 2-3 mm of material is the effect of shape memory at temperatures of 20-40(I.e., at temperatures close to the temperatures of the human body). To ensure this property of the material are subjected to thermal treatments on the known modes (C. N. Khachin, V. G. Pushin, in. A. Kondratyev: Nickelide titanium: structure and properties. - M.: Nauka, 1992, - S. 143-146). The final treatment is carried out by chemical etching.Use the device as follows. Provide rear access to the damaged segment of the spine. The device is cooled in a cold saline solution to a temperature of +5...+10C.The cooled device is deformed by stretching each of the brackets 1 to the desired length. Increasing the length of the brackets is due to the “gunzip” ring-shaped working elements 2. To install the device on the spine first slid under the spinous process of the underlying vertebra arched crosspiece 5, then set the hooks 4 on the side of the overlying vertebra. If necessary, a slight deformation of the hooks 4 (extension). When the heating device (spontaneous from body temperature or warm saline solution) work items 2 acquire the former form, the hooks 4 are bent. The device umenshaetsa provides reliable, stable, dynamic fixation invalid segment dosed, uniform on both sides of the axis of the spine compression, reliable samopoczucia device to the vertebrae, and also eliminates the possibility of damage to the spinal cord and can be used for different types of damage to any spine.The device is simple in construction, technology, fabrication, and installation method, universal application.
ClaimsDevice for posterior spinal fusion, made from a material with shape memory, containing two brackets with work items, hangers and hooks connected to each other by jumper, characterized in that the working elements of each of the brackets made in the form of open rings of the same diameter, and the jumper is in the same plane with the sides of both brackets and represents an arc in the form of a convex semicircle.
FIELD: medical engineering.
SUBSTANCE: device has two elastic plates and unit for fastening the plates to vertebral arches by means of two hooks placed under the arches on both sides of spinous process, two pins attached to corresponding hook with threaded connection and thrown over the hook with support given by its thrust journal for fastening arches in corresponding hook. The pins have restricting rest means. Connection strap is manufactured as a whole with elastic plate holders building U-shaped clamp having locking protrusions at pedicle ends turned inward. Plate holders are formed by clamp pedicles and locking protrusions. Elongated slot is available in clamp crossbar. The clamp is put over the pins via the elongated slot of the crossbar thrusting against restricting rest means of pins and connected to the pins by means of two nuts screwed over the corresponding pin from the external clamp side. Catching cells are produced in thrust journal of each hook for making additional fixation of the pins.
EFFECT: increased rigidity; fixation stability; accelerated operation process; reduced risk of traumatic complications.
2 cl, 3 dwg
FIELD: medicine; medical engineering.
SUBSTANCE: device is rectangular and has four or more slits for fixing means to pass through each of them. Two slits have exit to lateral side of plate to enable one to set the plate at required position and fix it without preliminarily removing the instrument for correcting orientation relative to vertebral column. Lateral plate surface runs from edge pointing the same direction with longitudinal plate direction. The latter exactly coincides with the vertebral column direction. The system comprises several vertebral column osteosynthesis plates to keep orientation correction relative to the vertebral column unchanged. Correction is carried out by means of the instrument for correcting orientation.
EFFECT: less number of holes to be drilled for mounting the device.
11 cl, 10 dwg
FIELD: medical engineering.
SUBSTANCE: device has plates having longitudinal segmentally counterbored slots and fastening members manufactured as bone screws with clamps. The clamps are manufactured as cramps having threaded openings in lower shelf. Locking members are mounted in threaded openings of the clamps. The locking members have threaded heads, hexagonal slot and smooth conic part set in hexagonal bone screw head slots. The bone screws are set in longitudinal segmentally counterbored slots of the plates. Their narrow parts under the heads pass through slits in the lower shelves of the clamps. The plates are connected to each other with cross-bar manufactured as rod ending with hook on one end which upper shelf has threaded hole for receiving locking member having threaded head, hexagonal slot and smooth thrusting part for fixing the cross-bar to a plate, the other free cross-bar end having corrugated part, has cross-bar clamp manufactured as cramps having threaded opening in upper shelf for receiving locking member having threaded head, hexagonal slot and smooth thrusting part supported by corrugated surface of the cross-bar to fix the cross-bar to the second plate. A hole is available in the upright connecting crossbar clamp shelves. The corrugated free crossbar end is movable and fixable in the hole.
EFFECT: enhanced effectiveness of treatment; reduced risk of traumatic complications; avoided blood deposit under plates.
FIELD: medical engineering.
SUBSTANCE: device has supporting frame and threaded rods mounted thereon to enable their transpedicular introduction into displaced vertebra body to take place with triangular structure being formed which apex is directed towards vertebral body. The supporting frame has screws introduced in transpedicular way into vertebral bodies adjacent to the displaced one, and connective bars building rigid structure by means of crossbars. The device has additional removable reposition frame resting upon the connective bars and joined to the threaded rods by means of transverse beam serving as triangular rigid structure base movable relative to the supporting frame. The screws and threaded rods have two threaded parts separated with spherical head, one of which is used for being introduced into bone tissue, and the other one is used for making connection to the connective bars. The connection is made as detachable floating fixing members having concave spherical surface for receiving rod and screw heads with variable connection angle. The detachable floating fixing members of the threaded rods have slots for receiving fingers connecting the threaded rods to the supporting frame allowing variable connection distances from the connective bars.
EFFECT: enhanced effectiveness of treatment.
FIELD: medicine; medical engineering.
SUBSTANCE: device has at least one connection member shaped as rod, at least two fixing means each fixable on vertebra body. The means have fork-shaped head parts which two branches determine U-shaped receiving space for the connection member to fit into it. Head is, as a rule, saddle-shaped, has locking screw for screwing-in into receiving space for fixing the connection member between two fork-shaped head branches. The head is guiding member for independent locking piece usable for carrying out fixation on the head after having set connection member into head fork. The locking piece is usually U-shaped, its branches being engageable with fork-shaped head part branches and its bottom part having opening with internal thread engageable with the locking screw. The guiding member available on the head part is formed with arc-shaped flanges available on lateral external surfaces of fork-shaped area. Fixing member has fork head, two branches of which determine receiving space of strictly U-shaped form for receiving connection member. Head is, as a rule, saddle-shaped. It serves as guiding member for independent locking piece usable for carrying out fixation on the head after having set connection member into head fork. The locking piece is usually U-shaped, its branches being engageable with fork-shaped head part branches and its bottom part having opening with internal thread engageable with the blocking screw. The guiding means available on the head part is formed with arc-shaped flanges available on lateral external surfaces of fork-shaped area. Auxiliary member has two end pieces positionable in slots available on implant head part and a means for applying force to the rod for causing lateral or vertical displacement to allow rod to be positionable in the slot.
EFFECT: retained correction degree and final fixation and tightening of screws selected by surgeon during operation.
12 cl, 4 dwg
FIELD: medical engineering.
SUBSTANCE: device has ball and socket joint casings having cylindrical and supporting parts, transpedicular screws having spherical heads, axial rods and transverse tie rods. Lower unseparable lips are available on external surfaces of supporting parts of ball-and-socket joints. The upper lips are separable and they are mounted on cylindrical parts of the casings. Cylindrical grooves which radii are equal to the axial rod radii are available on opposite surfaces of the upper separable and lower unseparable lips of the ball-and-socket joints. External thread is available in cylindrical parts of the casings with fastening nuts mounted thereon for fixing the separable lips. Locking members controlling angular displacements of spherical heads along transpedicular screw axes are manufactured as fixing screws having ring-shaped cutting edge on contact side to enable one to introduce them into internal threaded openings of the cylindrical parts. The axial rods are manufactured as pivot levers having rod part on one end and bushings on the other end arranged in perpendicular to each other. Locking member for controlling bushings rotation of pivot levers relative to each other is manufactured as radial teeth on plug plane and locking screws for positioning in bushing holes.
EFFECT: rigid fixation of injured vertebral column segment; small-sized fixing members; reduced risk of traumatic complications.
FIELD: medicine; neurosurgery; traumatic surgery.
SUBSTANCE: holder can be used for stabilization of damaged sectors of spinal column. Holder has transpedicular screws, longitudinal and lateral beams, fixing unit with two mutually perpendicular holes for screws and longitudinal beam. Longitudinal beams are made of shape-memory-effect material, which provides flexural rigidity of holder within 10 to 80 H/mm.
EFFECT: reduced risk of post-operational complications; stabilized traumatized segment of spinal column.
5 cl, 1 dwg
FIELD: medicine, in particular, equipment used in traumatology and orthopedics.
SUBSTANCE: apparatus has connection member 5, sealing cap 12, tightening means 13, locking means 21 for fixation, fixation means 35 used for securing of screw head 30 of bone fixation means in cavity 8 of connection member 5. Connection member 5 is positioned coaxially relative to central axis 2 and has upper end 6, lower end 7, cavity 8 arranged coaxially relative to central axis 2 extending through connection member 5 from its upper end 6 to its lower end 7, said cavity converging to its lower end 7 formed as at least one flange 9, and channel 10 extending through connection member 5 transverse to longitudinal axis 2 for receiving of longitudinal holder 11. Sealing cap 12 has front end 20, rear end 19, second cavity 18 open at its front end 20 for locating therein of connection member 5, and second channel 17 extending transverse to central axis 2 and opening toward front end 20 of sealing cap 12. Tightening means 13 may be fixed at rear end 19 of sealing cap 12 for retaining of longitudinal holder 11 located in channel 10 in connection member 5. Locking means 21 are positioned outside connection member 5 and in second cavity 18 of sealing cap 12 so as to mate each other and serve for fixation of sealing cap 12 on connection member 5.
EFFECT: increased efficiency owing to reduced space for implantation which is due to the possibility of introducing surgical instrument having diameter smaller than that of implant for preventing surrounding tissues from injury.
7 cl, 6 dwg
FIELD: medicine, traumatology, orthopedics.
SUBSTANCE: the present innovation deals with fixing affected segment in thoracic, lumbar and sacral vertebral departments. One should apply supporting elements of transpedicular system of bars which should be crossed in frontal plane and connected together with a fixing knot to regulate the angle of bars' crossing depending upon the requirements appeared, moreover, supporting elements should be applied through pedicles of vertebral arches that increases reliability of fixation at achieving osseous ankylosis.
EFFECT: higher efficiency.
2 dwg, 1 ex
FIELD: medicine; traumatic surgery; orthopedic devices.
SUBSTANCE: device for applying lengthening or stretching force to patient's body has aid for fastening first and second components to bones or to adjacent bones. Mentioned components are connected by increasing-length connecting aid. Device also has magnet connected with connecting aid and drive unit disposed outside patient's body for generating moving or changing electromagnetic field which results in rotation of magnet and elongation of connecting aid. Connecting aid has screw and nut. Magnet is connected with screw and nut by means of transmission box to generate relative rotation for elongating the device. Endoprosthesis replacement device to be elongated has first and second components that are connected by increasing-length unit. The first component has fraction of extremity joint. The second component has aid for fastening to resected long bone, magnet connected with connecting unit, and aid adjusted for disposition outside patient's body for generation of moving electromagnetic field which results in rotation of magnet and elongation of connecting unit. Magnet is connected with connecting unit by means of reduction gear. Device for correcting curvature of the spine has first and second shafts for elongation. Any shaft has its end to be connected with aid for fastening to corresponding vertebra. Connecting unit is adjusted in such a way that ends provided with fastening means were relatively movable. Mentioned connecting unit is connected with drive mechanism, which has rotated magnet, reduction gear, and drive aid for disposition outside patient's body. Generated moving or changing electric/magnetic field induces rotation of magnet and motion of fastening aid, disposed onto one shaft, relatively fastening aid, disposed at the other shaft.
EFFECT: elongation of bones or implants without surgical operation.
15 cl, 5 dwg