Device for spinal fusion
(57) Abstract:The invention relates to medicine, namely to neurosurgery and traumatology, and can be used during operations on the spine fractures, sprains, dislocations fractures of the vertebrae. The device is made from a material with shape memory and includes two parallel brackets supplied with the working elements in the form of single-turn coils lying in planes perpendicular to the planes of the brackets, and the jumper, representing one and a half coils of the cylindrical helix. The technical result is to ensure reliable fixation and stabilization of the damaged segment of any spine at fracture or absence of the bows of the vertebra. 6 Il. The device relates to medicine, namely to neurosurgery and traumatology, and can be used during operations on the spine fractures, sprains, dislocations fractures of the vertebrae.The number of known devices made from materials with memory, intended for fixation and stabilization of the damaged vertebrae. For example, the device described in /1/, represent a metal wire with locking elements that are curved in parallel or perpended commit typically, the adjacent vertebrae. The main disadvantage of these devices is that the locking elements are made in the form of closed loops, the installation conducted under the arms and can cause damage to the spinal cord. In addition, the absence of a working element causes severe /not dynamic/ fixation of the vertebrae, and also requires an exact match of the geometric parameters of the device size rear structures of the vertebrae. It should also put to rest that these devices cannot be used while the damage to the spinous process and the arches of the vertebra.As a prototype, as the closest to the technical nature of the device of the present invention, the authors made a device for posterior spinal fusion /2/. This device is made from a material exhibiting a shape memory effect at temperatures of + 37... + 55oC with an interval between the direct and reverse transformations in the range of 15...25oC, in the form of a wire loop, consisting of two parallel S - shaped elements connected by an arched bridge. The design of this device provides simultaneous fixation of three vertebrae, a uniform distribution of forces and Odinets several disadvantages.1. S - shaped working elements provides for devices under the arches of the vertebrae, which, as in the case of devices adopted for similar, may cause damage to the spinal cord and in addition it is technically difficult to perform.2. This device has a limited scope, since it is designed for fixation of C1-C2vertebrae /Atlanto-axial fusion/.3. The device is not applicable when the broken arches of the vertebrae, or in their absence due to surgical intervention.4. Arching jumper does not provide a secure fixation of the device to the spinous process of the vertebra and does not completely off traffic in the fixed segment of the spine, which in some cases may lead to renewed displacement of the vertebrae.The aim of the invention is to provide a reliable fixation and stabilization of the damaged segment of any spine at fracture or absence of the bows of a vertebra.This goal is achieved through the execution of the jumpers in the form of one and a half coils of the cylindrical spiral, and in parallel to each other brackets on the working element, wyzwanie alloys with shape memory allows you to give the device a form to facilitate its installation on the vertebrae, provides reliable samopoczucia device on the spine and the dynamic fixation of the vertebrae themselves.In Fig. 1, 2 shows the device in working condition - rear view and side view, Fig. 3, 4 in the deformed condition, rear view and side view, and Fig. 5, 6 - rear view and side view diagrams of the installation of the device on the spine.The device consists of two brackets 1C work items 2 and one jumper 3. For the manufacture of devices used materials exhibiting the shape memory effect at temperatures close to the temperature of the human body.The proposed device is used in fractures, sprains, dislocations fractures of the vertebrae, fractures of the arch and spinous process and after the surgery laminectomy for reliable and stable fixation of vertebrae. The arrangement of the upper locking elements - hooks set for bow upstream, relative to the damaged vertebra, and loop - cylindrical one and a half coils of the spiral is attached to the spinous process of the underlying, in relation to the damaged vertebra. Reliable fixation of the vertebrae is provided by the symmetric version of the device in the form of two parallelnymi in the form of one and a half coils of the cylindrical spiral device securely softcircuits at the spinous process, but due to the compression created work items, the locking elements staples are steadily on the arms of the overlying vertebra. Reliable samopoczucia device to the vertebrae does not require the execution of locking elements in the form of closed loops and, therefore, necessary to hold them under the arches of the vertebrae, which eliminates the possibility of damage to the spinal cord. Execution of work items in the form of a single-turn helices and are situated in planes perpendicular to the planes of the brackets, allows convenient placement of the device on the spine, provides the optimal parameters of the device. Thus, the device is simple in construction, technology, fabrication, and installation method.The proposed device is made from wire with a diameter of 2 to 3 mm from materials having shape memory effect, for example, alloys based on titanium nickelide brand TN-1, TN - 20. Flexible wire in order to give the device the necessary forms is carried out at a temperature of 550...+ 650oC. To ensure the manifestation of the shape memory effect at temperatures close to the temperature of the human body, the product is subjected to heat treatments on the known modes /3/. Final ablaut rear access to the desired spine with mandatory sellerbuyer the damaged vertebra and the two adjacent vertebrae. Make the necessary manipulations: elimination of dislocation, removal of fragments of the bows is broken vertebra, a laminectomy, a revision of the spinal canal. The device is cooled in a cold saline solution to a temperature of + 5... + 10oC and deform as follows. Stretch the device in a vertical direction so as to decrease the diameter of the working elements - single-turn helices. By pressing in a horizontal direction is formed into the shape of an ellipse spiral bridge, slightly unbend hooks. The vertical size of the device increases. First, put the jumper on the spinous process of the underlying vertebra, then set the hooks of the clamping elements for the arms of the overlying vertebra on opposite sides of the spinous processes. When the heating device /unwanted by body temperature or forced from thermal saline/ there is a restoration of the old forms of the product. When this jumper, taking the form of a cylindrical spiral, tightly covers the spinous process, thereby providing a reliable samopoczucia. If you increase the diameter of the spirals work items decreases the vertical size of the device and it hooks sea on the vertebrae.Providing a reliable and stable dynamic fixation of the damaged segment of the spine, this device eliminates the possibility of damage to the spinal cord and can be applied to various types of damage of any spine, including the fracture or the lack of arch of a vertebra.The sources used in the preparation of descriptions:
1. Patent N 2089124 of the Russian Federation, A 61 B 17/68.2. Patent N 2077282 of the Russian Federation, A 61 B 17/68.3. C. N. Khachin, V. G. Pushin, in. A. Kondratyev and other Nickelide titanium: structure and properties. Science, 1992, - S. 143-146. Device for spinal fusion, made from a material with shape memory and comprising two parallel clamps, connected by a crosspiece, wherein the retainer is a one and a half coils of the cylindrical spiral, and each of the brackets includes a working element in the form of a single-turn helix, located in the plane perpendicular to the plane of the bracket.
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