RU194459U1 - TELESCOPIC STAND FOR THE APPARATUS OF TRANSSTANCE OSTEOSYNTHESIS - Google Patents

Abstract

The utility model relates to medicine. The telescopic rack for the transosseous osteosynthesis apparatus comprises a mounting plate (14), a hinge (15) connected to the plate, a threaded rod (16) and a length changing unit (17) of the rack, each connected to the hinge. The strut length change unit includes a fracture reposition mode unit (18), a deformation correction mode unit (19), a threaded sleeve (21), and a rotary case (22) functionally connected to the threaded sleeve. The threaded sleeve contains a groove (24) with through holes (25), a spring ring (36) with two holes (37.38) and an open ring (26) with two protrusions. One of the protrusions (27) is provided with a pin (29) made with the possibility of insertion into one of the holes of the spring ring, and the other protrusion (28) has a through groove (30), in which a beam (31) is installed, equipped with a pin (35), made with the possibility of insertion into another hole of the spring ring and the protrusion (34). The rotation of the specified housing to change the length of the specified rack provides the ability to enter the ledge of the rocker arm into the through hole of the grooves to ensure the generation of an audio signal. The utility model simplifies the adjustment of the length of the telescopic stand and reduces the likelihood of exhibiting its wrong length. 3 ill.

Description

FIELD OF TECHNOLOGY

This utility model relates to the field of medicine, namely to traumatology and orthopedics, and is intended for use in the restoration of deformed and damaged bones of human limbs.

BACKGROUND

Known transosseous devices based on computer navigation, the so-called hexapods, which allow to extend human bones and eliminate deformations of human long bones based on calculations obtained in a computer program. Such known transosseous devices contain two (2) rings, each of which fixes bone fragments by means of transosseous elements (screw rods, knitting needles, etc.). The rings are connected by telescopic racks. Changing the lengths of telescopic racks leads to a change in the spatial position of the rings and bone fragments, respectively. In order for the bone fragments to take anatomically correct position as a result of changing the lengths of the telescopic racks in a computer program, the calculation of the changes in the lengths of the telescopic racks [Solomin L.N. Basics of transosseous osteosynthesis. Private issues - 2. M.: Publishing house BINOM, 2015. - T. 2 - 2nd edition, revised and supplemented. - 2015. - 560 p.].

The well-known Taylor apparatus (the so-called Taylor spatial frame, Taylor Spatial Frame or TSF) is described, for example, in the following article, published in 2011 in the 5th issue of the children's orthopedics magazine: D. Dammerer, K. Kirshbichler, L. Donnan, G. Kaufmann, M. Krismer and R. Biderman. Clinical Evaluation of Taylor Spatial Frame: Comparison with Ilizarov Lock and Orthofix Faxer [Dammerer, D., Kirschbichler, K., Donnan, L., Kaufrnann, G., Krismer, M., & Biedermann, R. (2011). Clinical value of the Taylor Spatial Frame: a comparison with the Ilizarov and Orthofix fixators. Journal of Children's Orthopedics, 2011; 5 (5): 343-349. doi: 10.1007 / s11832-011-0361-3].

The Taylor apparatus has the following disadvantages:

- each telescopic stand has two cardan joints (one at each of its ends), each of which has a play. As a result, the available twelve (12) cardans are the cause of great instability of the apparatus, which causes pain to the patient;

- the operation of the apparatus is based on the effect of a single telescope, which leads to a small efficiency of the telescopic stand (the possibility of small changes in length). In this regard, each of the telescopic racks in the Taylor apparatus is represented by six standard sizes. It should be noted that the process of replacing a telescopic rack of one standard size with a rack of another standard size is a complex and time-consuming process;

- the scale of the telescopic rack in the Taylor apparatus implies a minimum change in length equal to 1 mm, which is an extremely large “step” of simultaneous distraction and can adversely affect the properties of the distraction regenerate.

Some of the above-described disadvantages of the Taylor apparatus are deprived of the telescopic stand of the Ortho-SUV transosseous apparatus, described, for example, in the following article: [Skomoroshko PV, Vilensky VA, Hammouda AI, Fletcher MD, Solomin LN. Determination of the Maximal Corrective Ability and Optimal Placement of the Ortho-SUV Frame for Femoral Deformity with respect to the Soft Tissue Envelope, a Biomechanical Modeling Study. Adv Orthop. 2014; 2014: 268567. doi: 10.1155 / 2014/268567]. The Ortho-SUV apparatus is shown in FIG. 1. This apparatus contains a main support ring 1 and a movable support ring 2, which are interconnected by six telescopic racks 3. To change the position of the support rings that fix the bone fragments, the lengths of the telescopic racks are changed in space during correction of human bone deformation. The operation of the telescopic racks of the Ortho-SUV apparatus is based on the effect of a double telescope, which, together with the reverse mechanism, causes a large resource for changing lengths. Thus, in the apparatus "Ortho-SUV" there is no need to use a large number of sizes of telescopic racks. In other words, when using the Ortho-SUV apparatus, the deformation of human bones is corrected using telescopic racks of the same size. The telescopic rack of the Ortho-SUV apparatus has at its base only one (1) cardan hinge, which reduces the backlash of such an apparatus during its assembly.

The telescopic rack of the Ortho-SUV apparatus is selected as the closest analogue (prototype) and is shown in FIG. 2.

The telescopic post for transosseous osteosynthesis apparatus shown in FIG. 2, contains a plate 4, a hinge 5 cardan, a threaded rod 6 and the node 7 changes the length of the rack. The strut length change unit 7 comprises a fracture reposition mode unit 8 and a deformation correction mode unit 9, which have a common housing 10, a threaded sleeve 11, supporting a housing of the strut length change unit 12, and a lock nut 13.

The length of the telescopic racks during correction of deformation of human bones is changed by turning the housing 10 relative to the threaded sleeve 11 in the desired direction (to increase or decrease). The direction of movement to increase the length is indicated on the case 10 by a plus sign, to decrease by a minus sign. When the body 10 is rotated, the longitudinal risks are aligned every 45 degrees with the notch on the threaded sleeve 11. Changing the length of the stratum by a distance equal to the distance between the risks of the body 10 corresponds to a step of 0.25 mm.

The main disadvantage of the prototype is that changing the lengths of telescopic racks is a complex and time-consuming process for the following reasons:

- there are no digital symbols on the scale;

- when changing the length of the telescopic stand by rotating the housing 10, it is necessary to combine the longitudinal risks on its housing and the risk on the threaded sleeve 11. These risks are very subtle, and therefore the procedure for changing the length of the telescopic rack often requires additional assistance, since this procedure often does not able even a person with good eyesight.

This significant technical drawback complicates the treatment of patients, causes discomfort for patients and causes errors in the correction of patient bone deformities, which leads to the appearance of pain in human bones, increases the wearing time of such an apparatus on the restored limb and, therefore, increases the recovery period the patient.

Thus, the need for further improvement of the known telescopic racks for the transosseous osteosynthesis apparatus is obvious, in particular, to simplify the process of treating patients, eliminate discomfort for patients during correction of their bones deformation, and prevent the possibility of errors during correction of patients ’bone deformities.

Therefore, an urgent problem is to develop a telescopic rack that overcomes at least the above-mentioned disadvantages of the known telescopic rack.

DISCLOSURE OF THE ESSENCE OF A USEFUL MODEL

The objective of this utility model is to create a telescopic stand for transosseous osteosynthesis apparatus that solves at least the problem outlined above.

The problem is solved due to the fact that in the telescopic rack for the transosseous osteosynthesis apparatus containing the mounting plate, a hinge connected to the plate, a threaded rod and a rack length changing unit, each connected to the hinge, moreover, the rack length changing unit includes a fracture reposition unit, a block deformation correction mode, a threaded sleeve and a rotary housing functionally connected to a threaded chair, the threaded sleeve contains: a groove with through holes; snap ring with two holes; an open ring with two protrusions, one of which is provided with a pin adapted to be inserted into one of the openings of the spring ring, and the other protrusion has a through groove in which a beam is provided, provided with a pin configured to be inserted into the other opening of the spring ring and the protrusion, however, the rotation of the specified housing to change the length of the specified rack provides the ability to enter the ledge of the rocker into the through hole of the grooves to ensure the generation of an audio signal.

The proposed telescopic rack for transosseous osteosynthesis apparatus provides a technical result in the form of simplifying the adjustment of its length and reducing the likelihood of setting the wrong length of the telescopic rack, in particular through the use of a sound notification mechanism for the user to change the length of the telescopic rack by a predetermined amount.

BRIEF DESCRIPTION OF THE DRAWINGS

In FIG. 1 shows the appearance of the famous apparatus "Ortho-SUV", while its main structural elements are indicated by the following reference numbers:

1 - base support ring;

2 - movable support ring;

3 - telescopic racks;

In FIG. 2 shows a known telescopic stand for the Ortho-SUV apparatus shown in FIG. 1, while its main structural elements are indicated by the following reference numbers:

4 - platik;

5 - cardan joint;

6 - threaded rod;

7 - node change the length of the rack;

8 - block reposition of the fracture;

9 is a block of the deformation correction mode;

10 - case;

11 - threaded sleeve;

12 - the unit body changes the length of the rack;

13 - a lock-nut.

In FIG. 3 shows a telescopic stand according to the present utility model, while its main structural elements are indicated by the following reference numbers:

14 - a platik;

15 - cardan joint;

16 - threaded rod;

17 - node changing the length of the rack;

18 - block fracture reposition;

19 is a block of the deformation correction mode;

20 - case;

21 - threaded sleeve;

22 - the unit body changes the length of the rack;

23 - a lock-nut;

24 - groove;

25 - through holes;

26 - contains an open ring;

27 - the first ledge;

28 - the second ledge;

29 - pin;

30 - through groove;

31 - rocker;

32 - shoulders;

33 - axis;

34 - ledge;

35 - pin;

36 - a spring ring;

37 - the first hole of the ring;

38 - the second hole of the ring;

39 - a lock-nut;

40 - fixing screw;

41 - fixing screw;

42 - threaded sleeve.

IMPLEMENTATION OF A USEFUL MODEL

The telescopic rack for the transosseous osteosynthesis apparatus, according to the present utility model, can be used in known transosseous apparatuses, in particular, in the Ortho-SUV apparatus. As shown in FIG. 3, the telescopic rack as a whole comprises a plate 14 configured to be attached to the external annular support of the transosseous apparatus, a cardan hinge 15 connected to the plate 14, and also contains a threaded rod 16 and a rack length changing unit 17, each connected to the cardan hinge 15 by finger (not shown).

The strut length changing unit 17 comprises a fracture reposition mode unit 18 and a deformation correction mode unit 19, which have a common housing 20, and also includes a threaded sleeve 21 supporting a housing 22 of the strut length changing unit and a lock nut 23.

The body of the unit for changing the length of the stratum 22 has an internal thread corresponding to the external thread of the sleeve 21, has at the end a constriction that enters the inside of the body of the block of the deformation correction mode 19, and is fixed with a fixing screw 40

The threaded sleeve 21 has a groove 24 with through holes 25 and contains an open ring 26 provided with the first and second protrusions 27, 28, while the first protrusion 27 is provided with a pin 29, and the second protrusion 28 has a through groove 30 into which the rocker arm 31 is equipped with two shoulders 32, an axis 33, a protrusion 34 of the rocker arm and a pin 35 of the rocker arm. In addition, the threaded sleeve 21 includes a spring ring 36 provided with first and second holes 37, 38. A rocker pin 35 is placed in the first hole 37, and a pin 29 of the first protrusion 27 of the open ring 26 is placed in the second hole 38.

The groove 24 is designed to fix the open ring 26 on the threaded sleeve 21. The through holes 25 are designed to accommodate the protrusion of the rocker arm 34. The ring 26 can be either closed or open.

The axis 33 is designed to provide rotation of the rocker arm 31 relative to the protrusion 28 of the open ring 26 around a fixed axis.

The functional purpose of the telescopic stand according to the present utility model is described below.

Telescopic racks according to this utility model are used to interconnect support rings of a transosseous apparatus, each telescopic rack being attached at one of its ends to a support ring using a plate 14 and attached to a threaded rod 16 of an adjacent telescopic rack using a rack length changing unit 17. To change the spatial position of the support rings that fix the patient’s bone fragments, during the correction of the deformation of these bone fragments, the length of the telescopic racks connecting these support rings is changed. To change the length of the telescopic racks, the housing 22 is turned in the desired direction (to increase or decrease). The direction of movement to increase the length can be indicated on the rack by a plus sign, to decrease by a minus sign.

In the process of changing the length of the telescopic rack during rotation of the housing 22 by a step of a predetermined size, for example 90 degrees, which corresponds to 0.5 mm, the open ring 26 rotates relative to the threaded sleeve 21. In this case, the protrusion 34 of the rocker arm abuts against the wall of the through hole 25. When this occurs the rotation of the rocker arm 31 relative to the axis 33, and the shoulder 32 of the rocker arm abuts against the spring ring 36, causing it to deform. With continued rotation of the housing 22, the protrusion of the rocker arm 34 enters the next through hole 25 of the groove in the direction of rotation. At the same time, the rocker 31 restores its original position, and the spring ring 26 restores its shape, which is accompanied by an audible signal in the form of a click or crack, audible to the patient or user, which indicates a change (decrease or increase) in the length of the telescopic stand by a predetermined amount or notifies this user or patient.

When the deformation is corrected when the body 22 reaches the end of the thread of the sleeve 21 (i.e., reaches its maximum or minimum length), the telescopic stand loses the ability to change its length. "Distillation" is as follows. Loosen the locknuts 23 and 39, loosen the screw-clamp 40 of the deformation correction unit 19. Thereby, the common housing 20 is disconnected from the housing of the strut length change unit 22. The counter-uniform motion rotates the housing of the strut length change unit 22 and the common housing 20 relative to each other. In this case, the total length of the stratum remains unchanged, and the body of the unit for changing the length of the strut 22 moves relative to the threaded sleeve 21 in a predetermined position. Then, tighten the screw-clamp of the deformation correction block 40, locknuts 23 and 39. After that, the telescopic stand is ready for further work.

To reposition the fracture, loosen the lock nut 39, loosen the locking screw 41, twist the threaded rod 16 of the connector threaded sleeve 42 in the direction opposite to the housing 20. This action is performed on all six racks. Racks receive a “free play”, that is, they are destabilized. Carry out the support rings relative to each other manually, while the case 20 racks will change their position relative to the threaded rods passing through them 16. Holding the reached position of the rings manually, the threaded connector bushings of the racks 42 are moved along the threaded rods - 16 towards the bodies 20, screw them into these housings and fix with fixing screws 41 and locknuts 39.

Claims (9)

Telescopic rack for transosseous osteosynthesis apparatus, containing: mounting plate hinge connected to the plate a threaded rod and a rack length changing unit, each connected to a hinge, and the unit for changing the length of the strut contains a block of the fracture reposition mode, a block of the deformation correction mode, a threaded sleeve and a rotary case functionally connected to the threaded sleeve, moreover, the threaded sleeve contains: groove with through holes; snap ring with two holes; and an open ring with two protrusions, one of which is provided with a pin adapted to be inserted into one of the holes of the spring ring, and the other protrusion has a through groove in which a beam is provided, provided with a pin configured to be inserted into the other opening of the spring ring and the protrusion, however, the rotation of the specified housing to change the length of the specified rack provides the possibility of the entrance of the ledge of the rocker into the through hole of the grooves to ensure the generation of an audio signal.

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