Screw loosening prevention assembly for fixing intramedullary fixing rod and fracture site

Abstract

The present invention relates to a screw loosening prevention assembly for fixing an intramedullary fixing rod and a fracture site, and the screw loosening prevention assembly (100) comprises: a screw loosening prevention part (110) which is inserted into an intramedullary fixing rod (1), and which primarily presses screws fastened to a plurality of screw holes (1b) so as to prevent loosening of the screws; a screw loosening prevention tightening part (120) of which one side is fastened to a threaded portion (1a) formed on the upper end of the intramedullary fixing rod (1), and of which the other side presses the outer side of the upper end of the screw loosening prevention part (110) so as to bring same into very close contact with the fastening screws in order to secondarily prevent the loosening of the screws; and a finishing cap part (130) of which one side is fastened to the threaded portion (1a) formed on the upper end of the intramedullary fixing rod (1), and of which the other side presses the screw loosening prevention tightening part (120) so that the fastened screws can be more firmly pressed.

Description

An assembly to prevent the loss of screws for fixing the intramedullary fixation rod and fracture site

[0001] The present invention relates to an assembly for preventing screw loosening for fixing an intramedullary fixation rod and a fracture site, and relates to an assembly for preventing screw loosening for fixing an intramedullary fixation rod and a fracture site, which prevents screw loosening in the surgical stage in which the screw comes out due to micro-motion occurring in daily life after fixing a fracture using an intramedullary fixation rod and a screw in elderly patients with poor bone quality.

[0002] The femur, the largest joint in the human body, connects the pelvic bone and the thigh bone and plays an important role in lower body movement.

[0003] The femur is composed of a femoral head that is connected to the acetabulum of the pelvis, a femoral neck that is formed by extending downward from the femoral head, a greater trochanter that is formed by protruding from the femoral neck to have a roughly Y shape at a distance from the femoral head, a lesser trochanter that protrudes in a direction opposite to the greater trochanter of the femur, and a femur that is extended long in a downward direction.

[0004] When the femur is fractured, a nail (or implant) is inserted. The nail includes a nail body that is inserted from the upper part of the greater trochanter toward the femur, an upper screw (lag screw) that is inserted obliquely into the femoral head from the lower part of the greater trochanter to fix the upper part of the nail body, and a lower screw (antirotation screw) that is driven horizontally across the femur to fix the lower part of the nail body. In addition, a nail insertion device can be used to insert these nails.

[0005] The most commonly used femoral osteotomy technique is intramedullary nailing. Intramedullary nailing involves penetrating the fractured portion of the long bone, enlarging the upper and lower medullary canals, and then inserting a suitable metal nail to fix the fractured portion.

[0006] According to the above method of internal fixation, a strong fixation force can be obtained, so there is an advantage of allowing early movement.

[0007] However, when using the above-described intra-abdominal method, there was a problem in that the entire nail became loose as the fixing part of the nail that fixes the screw became loose while maintaining the position using a nail inserted into the intra-abdominal tube and fixing the nail using a screw.

[0008] This problem is caused by screw loosening, which occurs due to micro-motions that occur in everyday life.

[0009] This phenomenon can cause discomfort to the patient and, in severe cases, may require reoperation.

[0010] Accordingly, to solve the above problems, domestic patent registration No. 10-1415316 “Wire type nail assembly” is disclosed.

[0011] The above wire type nail assembly is installed at a fracture site and is composed of a main body having a space formed inside and a through hole through which a screw passes; and a wire body inserted into the space of the main body and coupled to the screw threads of the screw.

[0012] More specifically, as illustrated in FIG. 1 or FIG. 2, the wire-type nail assembly includes a main body (10), a wire body (30), and is composed of a mounting portion (11), a cap (12), a through hole (13), a first through hole (13a) to a fourth through hole (13d), an auxiliary through hole (14), a screw (20), a wire fixing portion (30a), a first connecting portion (31), a second connecting portion (32), and a wire (30).

[0013] The wire type nail assembly configured as described above is configured such that when the wire fixing part (30a) is coupled to the mounting part (11), a separate tool (not shown) is used to apply pressure and the wire body (30) is pushed into the space inside the main body (10), and when the pressure applied to the wire body (30) is removed at the position where the wire fixing part (31a) and the mounting part (11) are coupled, the wire body (30) is coupled by the elasticity of the wire body (30).

[0014] However, the above wire type nail assembly requires a special device to push the wire fixing part into the main body, and after installation, when fastening with a screw, the hole and the wire body do not align exactly, which hinders the progress of the screw, and thus has a problem in that the treatment time is delayed.

[0015] In addition, when unscrewing the screw to remove it from the main body, the wire body (30) is stuck to the screw threads and cannot be easily removed. This is because the wire is adhered to the screw.

[0016] Accordingly, the present invention was created to solve the above-mentioned problems of the prior art, and in order to prevent screw loosening, which occurs when a screw comes out due to micro-motion occurring in daily life after fixing a fracture using an intramedullary fixation rod and screw in an elderly patient with poor bone quality, in advance at the surgical stage.

[0017] Another object of the present invention is to provide a screw-release prevention sleeve, a screw tightening sleeve, and a finishing fastening portion, wherein screws are inserted through a through hole formed in an intramedullary fixation rod, thereby stably fixing the screws in the first place by pushing the screw-release prevention sleeve, and by tightening the screw tightening sleeve, a sleeve tightening portion connected thereto compresses the screw-release prevention sleeve to fix the screws in the second place, and a screw fastened to the sleeve tightening portion is firmly pressed by the finishing fastening portion to prevent the screw from falling out.

[0018] The present invention, in order to achieve the above technical task, is a screw-release prevention assembly for preventing screw loosening caused by micro-motions resulting from frequent movements when an elderly patient with poor bone quality suffers a fracture and then fixes the fractured area using an intramedullary fixation rod and screws and then goes about his daily life.

[0019] The above screw-preventing assembly (100) is;

[0020] A screw-release prevention unit (110) inserted into the inside of the above-mentioned intramedullary fixation rod (1) and pressurizing the screws fastened to the multiple screw holes (1b) to prevent the screws from coming out; and

[0021] One side is fastened to a screw (1a) formed on the top of the intramedullary fixation bar (1) and the other side is a screw-release prevention tightening part (120) that presses the upper outside of the screw-release prevention part (110) to make it more closely adhere to the fastening screw and prevent screw-release for a second time; and

[0022] One side is fastened to a screw (1a) formed on the upper side of the intra-bone fixation rod (1), and the other side is composed of a finishing cap part (130) that presses the screw-release prevention tightening part (110) to further secure the fastened screw.

[0023] The present invention's intramedullary fixation rod and screw loss prevention assembly for fixing a fractured part can achieve the following effects.

[0024] First, in elderly patients with poor bone quality, screw loosening, which occurs when the screw comes out due to micro-motions occurring in daily life, can be prevented in advance at the surgical stage after fixing the fracture using an intramedullary fixation rod and screw.

[0025] Second, by easily preventing screw loss using relatively simple structures such as a screw-release prevention sleeve, a screw tightening sleeve, and a finishing fastening member, the discomfort of patients and the problem of having to perform a second surgery can be resolved.

[0026] Third, the screws are first stably fixed by pushing the screw-out prevention sleeve through the through hole formed in the intramedullary fixation bar, and then the screw tightening sleeve is tightened so that the sleeve tightening part connected thereto presses the screw-out prevention sleeve to fix it secondarily, and the screws fastened to the sleeve tightening part are firmly pressed by the finishing fastening part to reliably prevent the screws from falling out.

[0027] Figure 1 is a drawing showing a conventional wire-type nail assembly for preventing loss of a screw that fixes an intramedullary fixation rod and a fracture site.

[0028] Figure 2 is a longitudinal cross-sectional view of Figure 1.

[0029] Figure 3 is an exploded perspective view showing a screw-slip prevention assembly for fixing a fractured part and an intramedullary fixation rod according to the present invention.

[0030] Figures 4 (a) to (c) are drawings showing a screw-loosening prevention part according to the present invention.

[0031] (a) is a perspective view, (b) is a front view, and (c) is a side view.

[0032] Figures 5 (a) to (d) are drawings showing a screw-loosening prevention fastening part according to the present invention.

[0033] (a) is a separate perspective view, (b) is a combined perspective view, (c) is a drawing showing the front in the combined state, and (d) is a drawing showing the side in the combined state.

[0034] Figure 6 is a drawing showing a finishing cap portion (130) according to the present invention.

[0035] Figure 7 is a partial cross-sectional view showing the installed state of the screw-slip prevention assembly for fixing the intramedullary fixation rod and the fracture site according to the present invention.

[0036] Hereinafter, with reference to the drawings, the configuration of the intramedullary fixation rod having the separation structure of the present invention and the screw loss prevention assembly for fixing the fractured part will be described in detail.

[0037] However, the disclosed drawings are provided as examples to ensure that those skilled in the art can sufficiently convey the spirit of the present invention. Therefore, the present invention is not limited to the drawings presented below and may be embodied in other aspects.

[0038] In addition, unless otherwise defined, terms used in the specification of the present invention have meanings commonly understood by a person of ordinary skill in the art to which the present invention pertains, and detailed descriptions of known functions and configurations that may unnecessarily obscure the gist of the present invention in the following description and accompanying drawings are omitted.

[0039] The present invention is a screw-loosening prevention assembly (100) for preventing screw loosening caused by micro-motions resulting from frequent movement when an elderly patient with poor bone quality suffers a fracture and then fixes the fractured area using an intramedullary fixation rod and screws and then goes about his daily life, as shown in FIG. 3,

[0040] It is largely composed of a screw-slip prevention part (110), a screw-slip prevention tightening part (120), and a finishing cap part (130).

[0041] More specifically, the screw-loosening prevention part (110) has an overall cylindrical shape as shown in (a) and (b) of Fig. 4, but has a clamp-like shape when viewed from the front.

[0042] That is, the outer diameter is formed to be smaller than the inner diameter of the intramedullary fixation rod (1) so that it can be inserted into the intramedullary fixation rod (1), but a connecting portion (111) having a through hole (110a) at the upper portion is formed, and a pair of forceps-shaped holding portions (112, 112) that are formed to be long and open in the longitudinal direction are formed from both sides of the connecting portion (111).

[0043] A pressure hole (113) is formed on the inner side between the above-mentioned maintenance parts (112, 112) to primarily pressurize and fix the exterior of the fastening screw (2).

[0044] At this time, an inclined surface (112a) is formed on the upper part of the connecting portion (111) and the extended maintenance portion (112, 112).

[0045] The above screw-release prevention fastening part (120) is fastened to a screw (1a) formed in the intramedullary fixation rod (1) on one side as shown in FIG. 3, and the other side presses the upper outer side of the screw-release prevention part (110) to make it more closely adhere to the fastening screw, thereby preventing screw-release for a second time.

[0046] More specifically, as shown in (a) of Fig. 5, it is composed of a fixed connection part (121) and a pressure part (122).

[0047] The above fixed connection part (121) has a through hole (121a) having a wrench fastening part formed on one side, and a screw thread (121b) formed on the side, but the screw thread (121b) is formed only partially, and a step fixing part (121c) is formed on the inside of the screw thread, as shown in (b).

[0048] A pressure part (122) is slidably connected to the above-mentioned single-jaw fixing part (121c).

[0049] That is, one side of the pressurizing portion (122) is formed with a ring-shaped connecting portion (122a) that is slidably connected to the step fixing portion (121c), and a pressing piece (122b) formed in a wing shape is formed to protrude in the longitudinal direction from the connecting portion (122a).

[0050] Meanwhile, the above finishing cap part (130) is fastened on one side to a screw (1a) formed on the upper side of the intramedullary fixation rod (1) shown in FIG. 3, and the other side is configured to press the screw-release prevention tightening part (110) so as to further secure the fastened screw.

[0051] More specifically, as shown in FIG. 6, a push rod (133) is formed to protrude and push a screw (2) inserted into the intramedullary fixation rod (1) through a through hole (110a, 121a) formed in the screw-release prevention tightening portion (120) and the screw-release prevention portion (110) on one side, respectively, and is configured with a head portion (131) having a screw thread (132) formed on the outside of the other side to be combined with the screw thread (1a) formed on the inside of the intramedullary fixation rod (1).

[0052] As shown in Fig. 7, the intramedullary fixation rod and the screw loss prevention assembly (100) for fixing the fractured area are configured as described above. After fixing the fractured area using the intramedullary fixation rod (1) and the fastening screw (2), the screw loss prevention assembly (100) of the present invention is fixed to prevent the screw from loosening in advance, in which the fastening screw comes out of the fastening rod (1) due to micro-motions that occur due to frequent movements during daily life.

[0053] To this end, while the intramedullary fixation rod (1) and the fixing screw (2) are fastened, the screw loosening prevention part (110) of the present invention is pushed into the intramedullary fixation rod (1).

[0054] Then, the pair of clamp-shaped retaining parts (112, 112) pass over the fastening screw (2) and stop when they are positioned at the lower side of the connecting part (111).

[0055] At this time, the exterior of the above fastening screw (2) is maintained in a primarily pressed state by the pressure member (113) formed on the inner side of each of the pair of clamp-shaped retaining members (112, 112).

[0056] Next, when the through hole (121a) having the wrench fastening portion of the screw-release prevention tightening portion (120) is tightened using a wrench, the screw thread (121b) of the fixed connection portion (121) constituting the screw-release prevention tightening portion (120) is engaged with the screw thread (1a) formed on the intramedullary fixing rod (1) and moves forward.

[0057] Then, the pressure member (122) installed across the connecting member (121) slides toward the inside of the intramedullary fixation rod (1) and the outside of the screw-loosening prevention member (110) to pressurize the fastening screw for the second time.

[0058] That is, as the retaining member (112, 112) formed on the screw-off prevention member (110) enters along the upper formed inclined surface (112a), the retaining member (112, 112) is tightened toward the fastening screw, thereby pressurizing the fastening screw (2) for the second time.

[0059] The pressing bar (133) of the next finishing cap (130) passes through the through holes (110a, 121a) formed in the screw-release prevention tightening part (120) and the screw-release prevention part (110), respectively, and finally presses the upper surface of the fastening screw (2), thereby completely pressing the fastening screw with weak fastening force, thereby preventing micro-shaking of the fastening screw in advance.

[0060]

[0061] In the above description, the configuration and operation of the intramedullary fixation rod of the present invention and the screw pull-out prevention assembly for fixing the fractured part have been described in detail with reference to the attached drawings. However, the present invention can be variously modified, changed and substituted by those skilled in the art, and such modifications, changes and substitutions should be interpreted as falling within the scope of protection of the present invention.

[0062] [Explanation of symbols]

[0063] 1: Intramedullary fixation rod 2: Fixing screw

[0064] 100: Screw-in prevention part 110a: Through hole

[0065] 111: Connection 112,112: Maintenance

[0066] 113: Pressurized part 120: Screw-in prevention fastener

[0067] 121a: Through hole with wrench fastening part 121: Fixed connection part

[0068] 121b: Screw thread 122: Pressurized part

[0069] 130: Finishing cap 131: Head

[0070] 132: Screw thread

Claims

1. When an elderly patient with poor bone quality suffers a fracture, the fractured area is fixed using an intramedullary fixation rod and screws, and then the patient returns to daily life. In this case, a screw loosening prevention assembly is provided to prevent the screw from coming out of the fixation rod due to micro-motions caused by frequent movements. The above screw-prevention assembly; A screw-release prevention unit inserted into the above-mentioned intra-bone fixation rod and used to first pressurize screws fastened to a number of screw holes to prevent screw loss; and One side is fastened to a screw formed at the top of the intramedullary fixation bar, and the other side is a screw-release prevention tightening part that presses the upper outside of the screw-release prevention part to make it more closely adhere to the fastening screw to prevent screw-release for a second time; and An assembly for preventing a screw from falling out for fixing an intramedullary fixation rod and a fractured portion, characterized in that one side is fixed to a screw formed on the intramedullary fixation rod, and the other side is configured with a finishing cap part that presses the screw-fallout prevention tightening part to more firmly press the fixed screw.

2. In paragraph 1, The above screw-loosening prevention part; A connecting part having a through hole in the upper part; and A pair of forceps-shaped retaining members formed long and open from both sides of the above connecting portion; and An assembly for preventing a screw from falling out for fixing an intramedullary fixation rod and a fractured portion, characterized by including a pressurizing member for primarily pressurizing and fixing the exterior of the screw on the inner side between the above-mentioned maintenance members.

3. In paragraph 2, An assembly for preventing the loss of a screw for fixing a fractured part and an intramedullary fixation rod, characterized in that an inclined surface is formed on the upper part of the connecting part and the extended retaining part.

4. In paragraph 1, The above screw-loosening prevention fastening part; A fixed connection part having a through hole formed on one side with a wrench fastening portion and a screw thread formed on the side, but the screw thread is formed only partially, and a step fixing portion formed on the inside of the screw thread; and It consists of a pressing part that is freely rotated by slidingly connecting to the above-mentioned step fixing part and pressurizes the upper part of the screw-loosening prevention part; An assembly for preventing loss of a screw for fixing a fractured portion and an intramedullary fixation rod, characterized in that one side of the pressurizing portion is formed with a ring-shaped connecting portion that is slidably connected to the step-fixing portion, and a pressing piece formed by extending in a wing shape is formed on the connecting portion.

5. In either paragraph 1 or paragraph 4, The above finishing cap part; A screw-release prevention assembly for fixing an intramedullary fixation rod and a fractured portion, characterized in that it comprises a push rod configured to push a screw inserted into the intramedullary fixation rod by passing through a through hole formed in each of the screw-release prevention tightening portion and the screw-release prevention portion on one side, and a head portion having screw threads formed on the outside of the other side to engage with the screw threads formed inside the intramedullary fixation rod.

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