A centering and rotating device for Ilizarov bone external fixator

Abstract

A centering rotation device for an Ilizarov bone external fixator comprises a fixing assembly, a rotation adjustment assembly and a rotation positioning assembly; wherein one end of the fixing assembly is used for fixed connection with the proximal fixing ring of the Ilizarov bone external fixator, and the other end is connected to the rotation adjustment assembly; one end of the rotation adjustment assembly is connected to the fixing assembly, and the other end is arranged on the distal adjustment ring of the Ilizarov bone external fixator, and is used to apply rotational stress to the distal adjustment ring; one end of the rotation positioning assembly is fixedly connected to the proximal fixing ring of the Ilizarov bone external fixator, and the other end is movably sleeved on the distal adjustment ring of the Ilizarov bone external fixator through a hollow fixing ring, so that the distal adjustment ring can move within the space of the fixing ring. The present invention is convenient to disassemble and install, and can realize independent rotation adjustment of the distal circular ring, thereby playing a role in correcting the deviated bone force line.

Description

Technical Field

[0001] The invention relates to the field of orthopedic correction and rehabilitation, and in particular to a centering and rotating device for an Ilizarov bone external fixator. Background Art

[0002] At present, there are many bone deformity problems that need to be dealt with in orthopedic clinics, and fixation devices are indispensable in surgical bone treatment. The traditional fixation method generally uses steel plate internal fixation. Since the introduction of Ilizarov orthopedic technology in the 1990s, the correction of orthopedic deformities has made a leap forward. Ilizarov technology uses multi-plane thin Kirschner wires to penetrate the limbs and bone tissues and connect to a circular fixator. Generally, the steel needle is fixed in an appropriate position near the fracture site, and the steel needle is fixed to the Ilizarov external fixator through a needle clamp to achieve bone fixation and adjustment. The Ilizarov external fixator uses a certain hole position on the upper and lower fixing rings to fix the human fracture and the upper and lower rings of the external fixator to each other. However, the design of its components still has defects and the disadvantages of a single configuration. Using the parallel mechanism, which is currently relatively mature in mechanical engineering, as a carrier for the development of Ilizarov technology will help to promote Ilizarov technology to a wider range of applications. The existing Ilizarov external fixator can only provide one-way stretching and one-plane rotation, and rotational dislocation is prone to occur when the doctor manually adjusts it. It is difficult to manually correct the bone force line, and it has great limitations, which ultimately leads to unsatisfactory correction effects. Therefore, it is of great medical value to study a mechanism that can independently rotate around a fixed point of the rotation center. Summary of the invention

[0003] In view of the above-mentioned shortcomings in the prior art, the present invention proposes a centering and rotating device for an Ilizarov external fixator, which comprises a fixing assembly, a rotation adjustment assembly and a rotation positioning assembly; wherein one end of the fixing assembly is used to be fixedly connected to a proximal fixing ring of the Ilizarov external fixator, and the other end is connected to the rotation adjustment assembly; one end of the rotation adjustment assembly is connected to the fixing assembly, and the other end is arranged on a distal adjustment ring of the Ilizarov external fixator, so as to apply rotational stress to the distal adjustment ring; one end of the rotation positioning assembly is fixedly connected to the proximal fixing ring of the Ilizarov external fixator, and the other end is movably mounted on the distal adjustment ring of the Ilizarov external fixator through a hollow fixing ring, so that the distal adjustment ring can move in the space of the fixing ring.

[0004] In a preferred embodiment, the fixing assembly includes a first fixing clip and a first positioning ring, which are fixedly connected to the proximal fixing ring of the Ilizarov bone external fixator by bolts.

[0005] In a preferred embodiment, the first positioning ring is a 1 / 2, 1 / 3 or 1 / 4 ring.

[0006] In a preferred embodiment, the rotation adjustment assembly includes an adjustment gear, a rotating gear, a positioning bolt, a gear box, a second positioning ring, a fixing bolt and a gasket; the adjustment gear is arranged in the gear box and meshes with the rotating gear; a gear guide rail is arranged in the gear box, the rotating gear is movably clamped on the gear guide rail, and the second positioning ring is fixedly connected to the distal adjustment ring of the Ilizarov bone external fixator by the positioning bolt and the gasket.

[0007] In a preferred embodiment, the second positioning ring is a 1 / 2, 1 / 3 or 1 / 4 ring.

[0008] In a preferred embodiment, the rotational positioning assembly includes a second fixing clip, a fixing nut, a threaded column, a rotational clamp and a locking bolt; one end of the rotational positioning assembly is fixedly connected to the proximal fixing ring of the Ilizarov external fixator through the second fixing clip and the fixing nut via the first positioning ring; the other end of the rotational positioning assembly is connected to the rotational clamp through the threaded column.

[0009] In a preferred embodiment, the hollow fixing ring is formed by the rotating clamping member being locked by the locking bolt, and is movably sleeved on the distal adjustment ring so that the distal adjustment ring can move within the space of the fixing ring.

[0010] In a preferred embodiment, the adjusting gear is a hexagonal straight hole that can be adjusted with a hexagonal wrench, or can be adjusted with a flat, cross, or Pozidriv wrench.

[0011] The present invention, based on a full analysis of the adjustment principle of the Ilizarov external fixator, proposes an external fixator for correction of limb deformities and an adjustment mechanism that can independently rotate around a fixed point at a rotation center. The adjustment mechanism is easy to disassemble and install, and can achieve independent rotation adjustment around a fixed point at a rotation center while keeping a distal circular ring in a fixed position relative to a proximal fixed ring, thereby playing a role in correcting the deviation of bone force lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic structural diagram of a centering and rotating device for an Ilizarov bone external fixator.

[0013] Figure 2 The present invention is a structural schematic diagram of a centering and rotating device for an Ilizarov bone external fixator used in combination with the Ilizarov bone external fixator.

[0014] Figure 3It is a schematic diagram of the local details of the rotation adjustment assembly of the centering rotation device for the Ilizarov bone external fixator of the present invention.

[0015] Figure 4 The present invention is a schematic diagram of a rotation adjustment assembly of a centering rotation device for an Ilizarov bone external fixator.

[0016] Figure 5 The present invention is a schematic diagram of a rotation positioning assembly of a centering rotation device for an Ilizarov bone external fixator.

[0017] Figure 6 The figure is a schematic diagram of posture transformation of the centering rotation device for the Ilizarov bone external fixator of the present invention.

[0018] Among them, there are a first fixing clip 1, a first positioning ring 2, a proximal fixing ring 3; an adjusting gear 4, a rotating gear 5, a positioning bolt 6, a gear box 7, a second positioning ring 8, a distal adjusting ring 9, a fixing bolt 10, and a gasket 11; a second fixing clip 12, a fixing nut 13, a threaded column 14, a rotating clamp 15, and a locking bolt 16. DETAILED DESCRIPTION

[0019] In order to solve the defects of the prior art, the present invention provides a centering and rotating device for an Ilizarov bone external fixator. The technical solution implemented by the present invention is described in detail below through embodiments.

[0020] Embodiment 1

[0021] See also Figure 1 and Figure 2 , Figure 1 The present invention is a schematic structural diagram of a centering and rotating device for an Ilizarov bone external fixator. Figure 2 The present invention is a structural schematic diagram of a centering and rotating device for an Ilizarov bone external fixator used in combination with the Ilizarov bone external fixator.

[0022] The centering and rotating device for an Ilizarov external fixator provided by the present invention is a detachable centering and rotating mechanism based on the Ilizarov external fixator, and the device includes three major components: a fixing component, a rotation adjustment component, and a rotation positioning component. One end of the fixing component includes a first fixing clip 1 and a first positioning ring 2, and the first positioning ring 2 can be a 1 / 2, 1 / 3, or 1 / 4 ring. In this embodiment and the accompanying drawings, two 1 / 2 rings, that is, half rings, are used. The centering and rotating device for an Ilizarov external fixator is used to form a ring that is fixedly connected to the proximal fixing ring 3 of the Ilizarov external fixator without disassembling the Ilizarov external fixator. It is also possible to use three 1 / 3 rings, or four 1 / 4 rings, etc. according to actual conditions, to form a complete ring by bolt connection, and then to be fixedly connected to the proximal fixing ring 3 of the Ilizarov external fixator by bolts. The other end of the fixing component is connected to the rotation adjustment component through a retractable screw.

[0023] Please see again Figure 3 and Figure 4 , Figure 3 It is a partial detail schematic diagram of the rotation adjustment assembly of the centering rotation device for the Ilizarov bone external fixator of the present invention, Figure 4 The present invention is a schematic diagram of a rotation adjustment assembly of a centering rotation device for an Ilizarov bone external fixator.

[0024] like Figure 4 As shown, one end of the rotation adjustment component is connected to the fixing component, and the other end is arranged on the distal adjustment ring 9 of the Ilizarov bone external fixator. The rotation adjustment component includes an adjustment gear 4, a rotation gear 5, a positioning bolt 6, a gear box 7, a second positioning ring 8, a fixing bolt 10 and a gasket 11. Figure 3As shown, the adjusting gear 4 is arranged in the gear box 7, and the gear guide rail is arranged in the gear box 7. The rotating gear 5 is movably clamped on the gear guide rail, and the adjusting gear 4 and the rotating gear 5 are meshed with each other. The upper part of the gear box 7 is fixed to the proximal fixing ring 3 by the first fixing clip 1 and the fixing bolt 13 at the same time. The rotating gear 5 fixes the second positioning ring 8 with the distal adjusting ring 9 of the Ilizarov bone external fixator through the positioning bolt 10 and the gasket 11. The upper part of the adjusting gear 4 is designed to be a hexagonal straight hole shape, and the hexagonal wrench is inserted into the hole for manual adjustment, which drives the rotating gear 5 and the distal adjusting ring 9 to make circular motion along the guide rail, realizes the rotation of the fixed point of the relative rotation center of the integrated type, and applies rotational stress to the distal adjusting ring 9. According to the position change of the rotating gear 4 on the guide rail in the gear box 7, the relative rotation of the two hole rings is finely adjusted, and a continuous, slow and stable traction force is given to the bone fixed on the bone needle, which plays a role in correcting the offset bone force line. The rotation length mainly depends on the length of the guide rail in the gear box 7. By adjusting the gear 4, the distal circular adjustment ring 9 can be rotated at multiple angles around the fixed point of the rotation center relative to the distal fixed ring 1, such as Figure 6 As shown, Figure 6 The figure is a schematic diagram of posture transformation of the centering rotation device for the Ilizarov bone external fixator of the present invention, wherein the five-star symbol represents the center of the distal adjustment ring 9, that is, the fixed point of the rotation center. Figure 6 Two extreme positions are shown. Posture 1, i.e. the initial state, is at the maximum extreme position at this time, and the two hole rings have not yet rotated relative to each other; Posture 2, the mechanism is at the minimum adjustment position, and the distal circular adjustment ring 9 rotates at the maximum angle relative to the upper fixed ring 3. The change of point A in the figure can reflect the rotation change angle of the distal circular adjustment ring 9 during the adjustment process.

[0025] In this embodiment, the second positioning ring 8 is made of two 1 / 2 rings, that is, half rings, which are fixedly connected to the distal circular adjustment ring 9 of the Ilizarov bone external fixator. It can also be made of three 1 / 3 rings, or four 1 / 4 rings, etc., which are connected by bolts to form a complete ring, and then connected to the Ilizarov bone external fixator by bolts. Because the spatial arrangement on the Ilizarov bone external fixator is complicated and difficult to disassemble or move, the device of the present invention adopts a three-part component integrated design, which can be disassembled and installed without disassembling the Ilizarov bone external fixator, which is very convenient.

[0026] Please see again Figure 5 , Figure 5The present invention is a schematic diagram of a rotation positioning assembly of a centering rotation device for an Ilizarov bone external fixator. The rotation positioning assembly includes a second fixing clip 12, a fixing nut 13, a threaded column 14, a rotation clamp 15 and a locking bolt 16; one end of the rotation positioning assembly is fixedly connected to the proximal fixing ring 3 of the Ilizarov bone external fixator through the second fixing clip 12 and the fixing nut 13 through the first positioning ring 2; the other end of the rotation positioning assembly is connected to the rotation clamp 15 through the threaded column 14, and the rotation clamp 15 is locked by the locking bolt 16 to form a hollow fixed annular structure, which is movably sleeved on the second positioning ring 8 and the distal adjustment ring 9, so that the distal adjustment ring 9 can rotate and move around the fixed point of the rotation center relative to the proximal fixing ring under a specified spatial trajectory in the annular space formed by the rotation clamp 15 without displacement of the position in other directions.

[0027] The rotating clamp 15 is locked by the locking bolt 16. Since various Kirschner wires and surgical instruments are installed on the distal adjustment ring 9, the second positioning ring 8 and the distal adjustment ring 9 are fixed with a gap of 5 mm through the installation of three sets of fixing bolts 10 and gaskets 11, and the threaded column 14 and the second fixing clip 12 are connected to the proximal fixing ring 3 to determine the relative position of the proximal fixing ring 3 and the distal adjustment ring 9 and the rotation trajectory of the distal adjustment ring 9, and can be disassembled at any time.

[0028] When installing a centering rotation device for an Ilizarov bone external fixator of the present invention, the second positioning ring 8 in the rotation adjustment component and the rotation positioning component is installed and fixed by means of fixing bolts 10 and washers 11, and the rotation adjustment component is installed and fixed by means of positioning bolts 6 and washers 11 on the rotation gear 5, and the rotation positioning component is installed and fixed by means of a rotation clamp 15 and a locking bolt 16, and the upper parts of the two components are installed and fixed by means of fixing clips and positioning semicircular rings.

[0029] In addition, a centering rotation device for an Ilizarov bone external fixator of the present invention adopts a gear drive method, by installing and fixing a rotating gear 5 outside a gear box 7 on a distal adjustment ring 9, and using a hexagonal wrench to rotate and adjust the adjustment gear 4 inside the gear box 7, which transmits force to the rotating gear 5, drives the distal adjustment ring 9 to rotate relative to the proximal fixing ring 3. The adjustment method is cleverly designed and easy to disassemble. The adjustment gear 4 can be a hexagonal straight hole, which can be adjusted with a hexagonal wrench, or other adjustment methods such as flat-head, cross, or Pozidriv wrenches.

[0030] The centering rotation device for the Ilizarov bone external fixator of the present invention is easy to install and use, and the three major components are detachable. The various components and the proximal fixing ring and the distal adjustment ring of the Ilizarov bone external fixator are assembled and installed by two groups of positioning semicircular rings. The mechanism is designed by an integrated method, and the installation error can be reduced, and the accuracy of adjustment is improved. The rotating clamping member and the distal adjustment ring are in circular arc contact. Since various Kirschner wires, nuts and other needle fixing parts are installed on the distal adjustment ring, 5mm operating space is reserved for the distal adjustment ring and the second positioning ring by installing five circular arc gaskets, and the mechanism is stably fixed on the distal adjustment ring by squeezing the locking nut and fixing the second positioning ring. The installation is convenient and flexible, and the contact and fixing method is cleverly designed. Moreover, in complex limb correction, there is no need to disassemble the external fixator. The device of the present invention can be installed and fixed by the clamping action of the linear clamping member, and the operating space is reserved by the gasket. It is convenient to install and use, flexible in application, and has high clinical application value. The device of the present invention has an ingenious and reliable design, occupies a small space, is detachable, can be applied to the correction of various complex limb deformities, and has a high clinical application value and a good clinical application prospect.

[0031] It should be noted that the above content is a further detailed description of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation methods of the present invention are limited to these. Under the guidance of the above embodiments, technical personnel in this field can make various improvements and modifications on the basis of the above embodiments, and these improvements or modifications fall within the protection scope of the present invention.

Claims

1. A centering and rotating device for an Ilizarov bone external fixator, characterized in that: The centering and rotating device for an Ilizarov bone external fixator comprises a fixing component, a rotation adjustment component and a rotation positioning component; One end of the fixing assembly is used to be fixedly connected to the proximal fixing ring of the Ilizarov bone external fixator, and the other end is connected to the rotation adjustment assembly; the fixing assembly includes a first fixing clip and a first positioning ring, which are fixedly connected to the proximal fixing ring of the Ilizarov bone external fixator by bolts; One end of the rotation adjustment component is connected to the fixing component, and the other end is arranged on the distal adjustment ring of the Ilizarov bone external fixator, and is used to apply rotational stress to the distal adjustment ring; the rotation adjustment component includes an adjustment gear, a rotating gear, a positioning bolt, a gear box, a second positioning ring, a fixing bolt and a gasket; the adjustment gear is arranged in the gear box and meshes with the rotating gear; a gear guide is arranged in the gear box, the rotating gear is movably clamped on the gear guide, and the second positioning ring is fixedly connected to the distal adjustment ring of the Ilizarov bone external fixator through the positioning bolt and the gasket; One end of the rotation positioning component is fixedly connected to the proximal fixing ring of the Ilizarov external fixator, and the other end is movably mounted on the distal adjustment ring of the Ilizarov external fixator through a hollow fixing ring, so that the distal adjustment ring can move in the space of the fixing ring; the rotation positioning component includes a second fixing clip, a fixing nut, a threaded column, a rotation clamp and a locking bolt; one end of the rotation positioning component is fixedly connected to the proximal fixing ring of the Ilizarov external fixator through the second fixing clip, the fixing nut and the first positioning ring; the other end of the rotation positioning component is connected to the rotation clamp through the threaded column.

2. The centering and rotating device for an Ilizarov bone external fixator according to claim 1, characterized in that: The hollow fixing ring is formed by the rotating clamping member being locked by the locking bolt, and is movably sleeved on the distal adjustment ring so that the distal adjustment ring can move within the space of the fixing ring.

3. The centering and rotating device for an Ilizarov bone external fixator according to claim 1, characterized in that: The first positioning ring is a 1 / 2, 1 / 3 or 1 / 4 ring.

4. The centering and rotating device for an Ilizarov bone external fixator according to claim 1, characterized in that: The second positioning ring is a 1 / 2, 1 / 3 or 1 / 4 ring.

5. The centering and rotating device for an Ilizarov bone external fixator according to claim 1, characterized in that: The adjusting gear comprises a straight hole adjusted by a hexagonal wrench, or a straight hole adjusted by a slotted, cross or Pozidriv wrench.

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