UA88394U - "step", versatile piston for meshed telescopic-type endoprosthesis of backbone segment - Google Patents

Abstract

The versatile piston for the meshed telescopic-type endoprosthesis of the backbone segment contains the oppositely directed threads and the through lateral openings designed, at least on one threaded half as the grooves in parallel to the longitudinal axis

Description

The universal stem for Mesh Telescopic Spinal Endoprostheses features an external multi-directional thread and through side holes. The holes on at least one carved half of the rod are made in the form of grooves parallel to its longitudinal axis.

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The useful model belongs to medical technology, namely, it concerns implants for restoring the function of the anterior support complex after resection of one or more vertebral bodies and can be used in orthopedics, traumatology and neurosurgery in the surgical treatment of diseases and injuries of the spine, in particular its cervical section.

A known endoprosthesis of a spinal segment, made in the form of a hollow cylindrical body with through side holes arranged in tiers; at the same time, the body cavity is filled with crushed bone grafts, and along the ring perimeter of both ends of the body, teeth are made, formed by dissecting the upper and lower tiers of holes

INattzv In Ipvigitepiess zripai! zigdegu Riipsiriyez apa yesppidnez5- Gpieyete, ZiShndan-Mem mMogk, 1999. - 198 r.

The main drawback of the prototype is that its design does not allow changing the length of the endoprosthesis, as a result of which it is not possible to accurately select the length of the prosthesis depending on the individual data of the patient, the location and size of the affected area of the spine. As you know, one of the most important conditions for achieving fusion at the level of anterior interbody spondylodesis is the careful selection of an interbody support of the appropriate size. An endoprosthesis that does not exactly correspond to the dimensions of the interbody space can cause either the loss of the fixing properties of the stabilizing structure, or the growth of deformation in the corresponding part of the spine with the subsequent development of severe clinical symptoms. In addition, the known endoprosthesis is difficult to manufacture (it is necessary to manufacture a wide range of products of various sizes) and to operate (it complicates the preoperative and operative periods due to the need to select a product with the optimal length, especially in urgent operations due to spinal injuries).

An endoprosthesis of a spinal segment is also known, which is a central cylindrical hollow rod with an external multidirectional thread, on which two hollow bodies with teeth on the outer ends are screwed, and the bodies and the rod have through side holes arranged in tiers, and the rod inside has an external annular protrusion with turnkey radial holes. The side tier holes in the hollow housings have a thread for screwing in them a locking screw, which penetrates into the side hole of the hollow rod to prevent further arbitrary movement of the housings relative to the rod, and thus unlocking the endoprosthesis. The inner cavity of the endoprosthesis is filled with crushed

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This class of endoprostheses includes

Tellur, NPIO "MedDetal" and the like), regardless of their design, a central rod is always included. In them, it acts as a tool that moves the bodies (body) to achieve a certain length with the endoprosthesis, determined by the distance between the vertebrae adjacent to the resected one, and to fix the endoprosthesis in the selected state. At the same time, the central rod can have both unidirectional and multidirectional threads on the cylindrical surface and through side holes. Since the central cylindrical hollow stem of the endoprosthesis

The MVA of the spine segment with an external multidirectional thread and through side holes arranged in tiers is the closest in its constructive essence and the effect achieved when used, it is taken as a prototype.

The main disadvantage of the known technical solution is that for fixing the housings relative to the rod, the latter has through side holes. The essence of this shortcoming is explained as follows. To fix the case immovably relative to the rod, the latter must be rotated until a pair of holes (one carved on the case, the other on the rod) completely coincide. Only in this case can a locking screw be screwed into the stem hole through the corresponding hole in the housing.

But, taking into account that the holes must be connected to each other according to two coordinates (by the radial angle and by height), sometimes the connected holes end up in an inconvenient place for screwing the locking screw into the case: either on the side or, in general, at the back. In these cases, the stem needs to be screwed back a few times (or, on the contrary, screwed even further) so that the connected holes are on top of the operating field. But at the same time, either the endoprosthesis is weakened (when the stem is unscrewed), or the bones of the adjacent vertebrae, which are used to place the endoprosthesis, are pressed (the spikes cut through the housings). This automatically leads either to the loss of the fixing properties of the stabilizing endoprosthesis design, or to the growth of deformation in the corresponding section of the spine with the subsequent development of severe clinical symptoms. Therefore, the use of holes in the structure of the stem, even if multi-tiered, does not solve the issue of a clear selection of the total length of the endoprosthesis, taking into account the individual characteristics of the patient's spine.

The useful model is based on the task of expanding the functionality of the central cylindrical stem for endoprostheses of the spine segment by eliminating one coordinate of the spatial movement of the holes in the stem during their connection with the holes in the housing (housing) by changing the linear length of the holes in the stem.

The solution to the given problem is achieved by the fact that in the central cylindrical hollow rod for mesh telescopic endoprostheses of the spine segment, which contains an external multidirectional thread and through side holes, according to a useful model, the holes on at least one half of the rod are made in the form of grooves parallel to its longitudinal axis.

Replacing the usual round holes with grooves eliminates the need to match the holes in the housings (housing) by height by rotating the rod. That is, adjustment is required for only one coordinate (radial angle) for coupling. Since the side holes in the cases (housing) are made in tiers, some of them must always coincide with some groove in the rod from the side of the operating field, which gives free access for mutual fixation of the case and the rod without weakening or overloading the endoprosthesis, which, as a result, simplifies and shortens the time of surgical intervention, is less traumatic for the spine and surrounding soft tissues, will contribute to a faster, high-quality and effective completion of the patient's rehabilitation period due to the high reliability of replacing the resected vertebra with an endoprosthesis.

So, the entire set of essential features of the proposed technical solution regarding the rod for endoprostheses of the spine segment, obtained due to a fundamental change in the design of the means for fixation, due to which it becomes universal, ensures the achievement of a positive result formulated in the statement of the problem.

The further essence of the proposed technical solution is explained together with the illustrative material, which shows: in fig. 1 - side view of the proposed central hollow rod for mesh telescopic endoprostheses of the spinal segment with multidirectional threads and grooves on one threaded part; in fig. 2 - the same, with grooves on both threaded parts; fig. C - the same, with a unidirectional thread.

The proposed universal rod for mesh telescopic endoprostheses of the spinal segment "STEP" (abbreviation of SepigaI-Telescopic-Endoprosthesis-Spine) contains an external multidirectional thread 1 and through side grooves 2 on one threaded part, and on the other threaded part - ordinary through side holes 3. The rod can have 2 grooves

Zo on both carved parts. Grooves 2 are made parallel to its longitudinal axis of the rod. The width of the grooves 2 is equal to the diameter of the holes on the bodies (body) of the endoprosthesis (not shown).

The proposed universal stem for mesh telescopic endoprostheses of the spine segment "STEP" is used as follows (on the example of the cervical spine).

After access to the desired segment of the spine is carried out by one of the known means, the elements of the front support complex are resected at the required interval. After that, the endoprosthesis of any sliding design, after filling with crushed bone biomaterial, is placed in the initial position in the interbody space between the upper and lower vertebrae instead of the extracted segment. Then, holding the endoprosthesis structure by the housing (body) from rotation with the help of a special key or any other suitable tool, rotate the stem. At the same time, due to the presence of multidirectional threads, the structure is pushed apart (the total length of the endoprosthesis increases) and, thus, compression of the endoprosthesis in the interbody space is achieved.

Next, a locking screw is screwed into the side hole in the housing, which connects to groove 2, to prevent the rod from being twisted by itself, after which the wound is sutured in layers. Therefore, due to the gradual distraction of the endoprosthesis itself, the necessary distraction of the spine is achieved, which ensures a strong stabilization of the endoprosthesis between the vertebral bodies and a reliable restoration of the supporting capacity of the spine.

The declared technical solution has been verified in practice. The proposed universal rod for mesh telescopic endoprostheses of the spine segment "STEP" does not contain any structural elements in its composition that would be impossible to reproduce at the current stage of development of science and technology, in particular in the field of medicine, and therefore is suitable for industrial use, has technical and other advantages over known analogues, which confirms the possibility of achieving the technical result of the declared object. In the known sources of patent and other scientific and technical information, no structures and samples with the set of essential features indicated in the proposal were found, therefore the proposed technical solution is considered to be eligible for legal protection.

The essential difference of the proposed technical solution is that the stem of the endoprosthesis does not require a two-coordinate connection of the holes due to the replacement of the holes in it with longitudinal grooves. This difference makes it possible to significantly make the stem universal, because it is adapted to any conditions of fixation of the endoprosthesis in the interbody space without weakening or overloading the latter, and therefore to improve the technical and operational characteristics of the endoprosthesis of the vertebral segment itself. None of the known designs of sliding endoprosthesis rods can have all the listed properties at the same time, since it does not contain the entire set of declared essential features.

The technical advantages of the proposed technical solution, in comparison with the prototype, include: - expansion of functional capabilities due to the possibility of connecting the openings of the housing with the grooves of the rod by only one radial coordinate; - versatility, as the longitudinal grooves in the stem are useful for any sliding design of endoprostheses; - significant simplification of fixation and selection of the optimal length of the endoprosthesis due to the presence of longitudinal grooves in the stem.

After describing the proposed technical solution, it should be apparent to those skilled in the art that the foregoing is merely illustrative and not restrictive. Numerous possible options for the execution of grooves in the rod may vary depending on the specific purpose, features of the material and manufacturing technology, etc., and, of course, are within the scope of one of the usual and natural approaches in this field of knowledge and are considered as being within the scope of of the proposed technical solution.

The quintessence of the proposed technical solution is that the stem of the endoprosthesis contains longitudinal grooves instead of multi-tiered holes. It is this fact that gives the proposed rod design the above-mentioned and other advantages. The use of separate combinations of grooves in the stem naturally limits the range of advantages listed above and cannot be considered new technical solutions in this field of knowledge, since other designs similar to the one described will no longer require any creative approach from designers and engineers, and cannot be considered the results of their creative activity or new objects of intellectual property suitable for protection by security documents.

Claims (2)

USEFUL MODEL FORMULA 1. A universal rod for mesh telescopic endoprostheses of a spinal segment, which contains an external multidirectional thread and through side holes, which is distinguished by the fact that the holes on at least one threaded half of the rod are made in the form of grooves parallel to its longitudinal axis. 2. The rod according to claim 1, which differs in that longitudinal grooves are made on both threaded parts. Z. The rod according to claim 1, which differs in that the grooves are made of screws. Her. heaven and 2 in and out B. zhi EE Han SCHO zve p SCHI po and OBOV loved VO OO ho. sao van yav Bidtsn Fig: 1 JHE EE with Neck: and M BA VV BO en Nei ee BECK. ve Es B B VO B more Fig. 7 es SHY re re ZK sec| ЗЭ zah Ж Z us: ЧО 8 Me ЗО na Я. Teya I Fig. WITH