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.

 

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