Internal fixation instrument for high tibial osteotomy

Abstract

The utility model relates to the technical field of medical instruments, in particular to an internal fixation instrument for high tibia osteotomy, which comprises a fusion body and a fixation body which are fixedly connected, the fusion body is implanted into an osteotomy notch, the fixation body is arranged outside the osteotomy notch in a fitting manner, and lengthening plates are symmetrically arranged in the width direction of the fixation body. The lengthening plate is fixedly connected with the tibia through the screw set, the screw set is divided into a first screw unit and a second screw unit, the first screw unit is arranged above an upper incisura of an osteotomy notch, the second screw unit is arranged below a lower incisura of the osteotomy notch, and the first screw unit and the second screw unit each comprise a positioning part and a locking part. The positioning part is arranged on the side close to the osteotomy notch. According to the internal fixation instrument for high tibia osteotomy, the fusion body and the fixing body are combined, and the lengthening plate and the screw set are arranged on the fixing body, so that an osteotomy notch is fixed, the stripping range of soft tissue can be reduced, trauma is small, and the operation process can be simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially is related to a kind of for tibial high osteotomy internal fixation instrument. BACKGROUND

[0002] Tibial high osteotomy is the main means of knee joint orthopedics and knee preservation surgery, and is also suitable for medial, lateral or total condylar knee disease. Generally, the proximal tibial development or poor alignment due to trauma is the main cause of the proximal tibial varus, valgus or rotational deformity, and osteotomy orthopedics is to correct its varus, valgus or rotational deformity to reconstruct the stress axis. The internal fixation device widely used after tibial high osteotomy at present is bone plate.

[0003] After searching, the patent with the announcement number CN113520518B discloses a tibial high guiding osteotomy orthopedic internal fixation device, which includes an internal fixation device, a guiding osteotomy device, and an alignment reference device. The guiding osteotomy device is used for positioning and guiding during osteotomy, the alignment reference device is used for tibial alignment after osteotomy, and the internal fixation device is used for adjusting tibial alignment and fixing the two segments of tibia after osteotomy, solving the problems of poor positioning and guiding accuracy, complicated surgical procedure, and lack of adjustability in the current Kirschner wire guiding or guide guiding. However, the above-mentioned internal fixation device still uses a steel plate as the main structure. During use, it is found that the traditional steel plate has a large volume, requires more soft tissue to be stripped during fixation surgery, causes large trauma to the surgical area, and requires high placement accuracy, which requires multiple perspective positioning and complicated operation. SUMMARY

[0004] To solve the problems of large volume, large stripping area and large trauma of the existing internal fixation steel plate, the utility model provides a tibial high osteotomy internal fixation instrument, which combines the fusion body with the fixed body, and sets a lengthening plate and a screw set on the fixed body, to fix the osteotomy gap, reduce the stripping range of soft tissue, and reduce trauma, and simplify the surgical procedure.

[0005] The utility model provides a tibial high osteotomy internal fixation instrument, which includes a fixedly connected fusion body and a fixed body. The fusion body is implanted into the osteotomy gap, and the fixed body is arranged outside the osteotomy gap. The fixed body is symmetrically provided with a lengthening plate in the width direction. The lengthening plate is fixedly connected with the tibia through a screw set. The lengthening plate is more suitable for fixing the tibial high osteotomy gap. The lengthening plate is locked by a specific screw set, so that the internal fixation effect is good.

[0006] Further, the screw set includes a first screw unit and a second screw unit. The first screw unit is arranged above the upper notch of the osteotomy gap, and the second screw unit is arranged below the lower notch of the osteotomy gap. The two symmetrically arranged screw sets effectively fix the lengthening plate.

[0007] Further, the first screw unit and the second screw unit each include a positioning portion and a locking portion, the positioning portion is arranged at a side close to the osteotomy gap, and the locking portion is arranged at a side away from the osteotomy gap. The positioning portion is used for preliminary positioning of the lengthened plate, and the locking portion is used for limiting and locking the lengthened plate.

[0008] Further, the positioning portion includes three proximal screw holes, the locking portion includes one distal screw hole, and the distal screw hole is opposite to the proximal screw hole in the middle portion. The distal screw hole has an inverted triangular structure, and has a good locking effect.

[0009] Further, the proximal screw hole and the distal screw hole are each provided with a locking screw, the locking screw is implanted into the tibia through the fixing body, and the locking screws of the first screw unit and the second screw unit are each inclined to the side away from the osteotomy gap. The inclined locking screw can more stably arrange the fixing body at the osteotomy gap.

[0010] Further, the proximal screw hole and the distal screw hole are each divided into a through hole close to the osteotomy gap and a positioning hole away from the osteotomy gap, and the diameter of the through hole is smaller than the diameter of the limiting hole. The through hole is used for guiding, and the limiting hole is used for locking.

[0011] Further, a limiting ring is screwed on the locking screw, the diameter of the limiting ring is greater than the diameter of the through hole and is not greater than the diameter of the limiting hole, and the limiting ring is arranged in the limiting hole. Through cooperation of the limiting ring and the limiting hole, the implantation length of the locking screw can be adjusted.

[0012] Further, the locking screw includes a shank and a head, the shank is threadedly connected with the limiting hole and is implanted into the tibia, and the head is provided with a slot convenient for insertion of an instrument. The slot is arranged to facilitate the instrument to screw the shank into the tibia, increase the holding force, and prevent the shank from being pulled out.

[0013] The utility model discloses the beneficial effect lies in:

[0014] The utility model provides a kind of for tibial high osteotomy internal fixation instrument, by combining fusion body and fixed body, and setting up lengthened plate and screw group that adhere tibial high on fixed body, realize the fixation of osteotomy gap, compared with the steel plate fixation of traditional larger volume, can reduce the range of stripping soft tissue, to reduce trauma, and operation is relatively simple, reduce the number of perspective, to reduce operation time. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0016] Figure 1 is a schematic view of the structure of the osteotomy internal fixation device;

[0017] Figure 2 is a schematic view of the structure of the locking screw;

[0018] Figure 3 is a schematic view of the use state of the osteotomy internal fixation device;

[0019] Fig. 1. fusion body, 2. fixed body, 3. osteotomy gap, 31. upper notch, 32. lower notch, 4. extension plate, 5. first screw unit, 6. second screw unit, 7. proximal screw hole, 71. through hole, 72. limiting hole, 8. distal screw hole, 9. locking screw, 91. limiting ring, 92. notch, 10. tibia. DETAILED DESCRIPTION

[0020] The technical scheme of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0021] In order to reduce the range of soft tissue stripping, reduce the trauma of the operation area, a tibial high osteotomy internal fixation device is designed, as shown in Figure 1 and 3 , which comprises a fixedly connected fusion body 1 and a fixed body 2, the fusion body 1 is implanted in the osteotomy gap 3, and the fixed body 2 is attached to the outside of the osteotomy gap 3, and the fixed body 2 is symmetrically provided with an extension plate 4 in the width direction, and the extension plate 4 is fixedly connected with the tibia 10 through a screw group. The fusion body 1 is similar to U-shaped, and the upper and lower end faces of the fusion body 1 are provided with positioning teeth, which can be well fused with the osteotomy surface after being placed in the osteotomy gap 3. The connection mode of the fusion body 1 and the fixed body 2 is disclosed in detail in the patent with the authorization announcement number CN205163322U, which will not be described here.

[0022] Among them, in order to more closely fit the tibial high, the fusion body 1 is designed to be thick, the thickness is 8-12mm, the height of the applied fusion body 1 is different for different surgical distraction, the fusion body 1 is long wedge-shaped, the material can be tantalum metal or polyether ether ketone, the middle four squares are hollow, which is convenient for bone growth, and the fixed body 2 is formed with an extension plate 4 on both sides in the width direction, and the screw group provided on the two extension plates 4 makes the fixed body 2 closely fit outside the tibial high osteotomy gap 3, and the two screw groups can increase the holding force of the fixed body 2, so that the internal fixation device is better fixed in the osteotomy gap 3, and the treatment effect is improved.

[0023] The screw component is composed of a first screw unit 5 and a second screw unit 6, the first screw unit 5 is arranged above the upper incision 31 of the osteotomy gap 3, and the second screw unit 6 is arranged below the lower incision 32 of the osteotomy gap 3. The first screw unit 5 is used to fix the lengthened plate 4 at the upper incision 31, and the second screw unit 6 is used to fix the lengthened plate 4 at the lower incision 32.

[0024] In order to improve the connection stability of the fixed body 2, the first screw unit 5 and the second screw unit 6 each include a positioning part and a locking part, the positioning part is arranged on one side close to the osteotomy gap 3, and the locking part is arranged on the side away from the osteotomy gap 3. Specifically, the positioning part includes three proximal screw holes 7, and the locking part includes one distal screw hole 8, which is opposite to the proximal screw hole 7 in the middle part. The proximal end of the fixed body 2 close to the osteotomy gap 3 is fixed by the locking screw 9 in the three proximal screw holes 7 arranged on both sides, and the distal end of the fixed body 3 away from the osteotomy gap 3 is fixed by the distal screw hole 8. The three proximal screw holes 7 and the distal screw hole 8 cooperatively form an inverted triangular structure, which has good stability.

[0025] In order to further improve the connection stability of the fixed body 2, the proximal screw hole 7 and the distal screw hole 8 are each provided with a locking screw 9, the locking screw 9 penetrates the fixed body 2 and is implanted into the tibia 10, and the locking screw 9 of the first screw unit 5 and the second screw unit 6 is inclined to the side away from the osteotomy gap 3. The locking screw 9 arranged in an inclined manner has a longer contact length with the tibia 10, which can increase the friction and enhance the stability of the internal fixation device implanted in the osteotomy gap 3.

[0026] The proximal screw hole 7 and the distal screw hole 8 are each divided into a through hole 71 close to the osteotomy gap 3 and a limiting hole 72 away from the osteotomy gap 3, and the diameter of the through hole 71 is smaller than that of the limiting hole 72. The through hole 71 plays a guiding role, making it more convenient to implant the locking screw 9 and saving operation time, and the limiting hole 72 plays a fixing role and is threadedly connected with the locking screw 9, which has good stability.

[0027] As shown in Figure 2 In order to adjust the length of screw implantation, a limiting ring 91 is threadedly arranged on the locking screw 9, the diameter of the limiting ring 91 is greater than that of the through hole 71 and not greater than that of the limiting hole 72, and the limiting ring 91 is arranged in the limiting hole 72. The limiting ring 91 threadedly arranged on the upper end of the locking screw 9 is rotated to control the length of the nail body inserted into the tibia, and when the limiting ring 91 on the locking screw 9 is abutted with the limiting hole 72, the locking screw 9 is implanted in place.

[0028] The locking screw 9 includes a nail body and a nail head, the nail body is threadedly connected with the limiting hole 72 and implanted into the tibia 10, and the nail head is provided with a slot 92 for facilitating the insertion of the instrument. The slot 92 can adopt a keyhole slot or an internal hexagonal slot, which facilitates the insertion of the instrument to screw the locking screw 9 into the tibia 10, increases the holding force, and prevents the locking screw 9 from being pulled out.

[0029] The above description is only illustrative and is not restrictive, and those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the appended claims.

Claims

1. An internal fixation device for high tibial osteotomy, characterized in that: The device includes a fusion body (1) and a fixation body (2) that are fixedly connected. The fusion body (1) is implanted in the osteotomy notch (3), and the fixation body (2) is fitted to the outside of the osteotomy notch (3). The fixation body (2) is symmetrically provided with an extension plate (4) in the width direction. The extension plate (4) is fixedly connected to the tibia (10) by a screw assembly.

2. The device for internal fixation of high tibial osteotomy according to claim 1, characterized in that: The screw assembly is divided into a first screw unit (5) and a second screw unit (6). The first screw unit (5) is positioned above the upper notch (31) of the osteotomy notch (3), and the second screw unit (6) is positioned below the lower notch (32) of the osteotomy notch (3).

3. The device for internal fixation of high tibial osteotomy according to claim 2, characterized in that: The first screw unit (5) and the second screw unit (6) both include a positioning part and a locking part. The positioning part is located on the side close to the osteotomy notch (3), and the locking part is located on the side away from the osteotomy notch (3).

4. The device for internal fixation of high tibial osteotomy according to claim 3, characterized in that: The positioning part includes three proximal screw holes (7), and the locking part includes a distal screw hole (8), which is opposite to the proximal screw hole (7) in the middle.

5. The device for internal fixation of high tibial osteotomy according to claim 4, characterized in that: Locking screws (9) are provided in both the proximal screw hole (7) and the distal screw hole (8). The locking screws (9) penetrate the fixation body (2) and are implanted into the tibia (10). The locking screws (9) of the first screw unit (5) and the second screw unit (6) are both tilted to the side away from the osteotomy notch (3).

6. The device for internal fixation of high tibial osteotomy according to claim 5, characterized in that: The proximal screw hole (7) and the distal screw hole (8) are both divided into a through hole (71) near the osteotomy notch (3) and a limiting hole (72) away from the osteotomy notch (3). The diameter of the through hole (71) is smaller than the diameter of the limiting hole (72).

7. The device for internal fixation of high tibial osteotomy according to claim 6, characterized in that: A limiting ring (91) is screwed onto the locking screw (9). The diameter of the limiting ring (91) is greater than the diameter of the through hole (71) but not greater than the diameter of the limiting hole (72). The limiting ring (91) is placed inside the limiting hole (72).

8. The device for internal fixation of high tibial osteotomy according to claim 6, characterized in that: The locking screw (9) includes a screw body and a screw head. The screw body is threaded into a limiting hole (72) and implanted into the tibia (10). The screw head is provided with a slot (92) to facilitate the insertion of instruments.

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