TWI580394B - Mandibular fixation device - Google Patents

Description

Tibial fixation device

The present invention relates to a medical device, and more particularly to a tibial fixation device for positioning a tibia during a squat reconstruction operation.

After a dental accident has occurred, if a severe fracture of the lower jaw is performed or a part of the lower jaw bone is removed to cause a wide range of bone fractures or bone defects, the patient's lower jaw needs to undergo a sac reconstruction to restore the facial contour. And chewing function. Among them, in the case of complete fracture of the mandible, the patient's masseter muscle and the tongue muscle will pull the lower jaw and cause dislocation. It needs to be restored by surgery and internal fixation, but the structure of the blood vessels, nerves and muscles of the face is quite complicated. Once the reconstruction work is inaccurate, there will be many sequelae, such as numbness of the face, malocclusion, ankle stiffness, facial asymmetry, etc., and facial defects can also lead to social obstruction, accompanied by depression.

In order to successfully perform the operation of squat reconstruction, the reconstruction should be performed before the reconstruction, so that the upper and lower tibia of the patient are kept in the normal occlusion position, and the relevant components for alignment are removed after reconstruction. At this stage, the alignment of the clinical iliac reconstruction surgery is divided into manual alignment and intercondylar fixation. The manual alignment is to reconstruct the patient's mandible and patch with the hand of the surgeon. The alignment accuracy is only Relying on the feel of the surgeon, lack of accurate alignment. The intercondyal fixation is to place the dental arch or bone nail on the upper or lower jaw teeth or gums, and use the steel wire or rubber band as the intercondylar fixation to keep the upper and lower tibia in the normal occlusion position.

For example, a conventional disclosure disclosed in U.S. Patent No. 8414851 The patella fixation device uses a plurality of cable ties to penetrate between each tooth to fix the upper and lower dental arch plates to the upper and lower teeth of the patient, and then to fix the upper and lower ends with the cable ties. The positioning function of the dental arch plate; accordingly, the conventional tibial fixation device can avoid the oral cavity and the surgical performer of the wire stab wound patient, but the conventional tibial fixation device has complicated operation steps, is time-consuming and labor-intensive, and is not applicable. Patients with excessive or missing teeth between the teeth. In another conventional patella fixation device disclosed in U.S. Patent No. 8,862,889, a plurality of bone nails are used to fix the upper and lower dental arch plates to the upper and lower gingiva, respectively, and then tied with a wire one by one. The opposite hooks on the lower arch plate; according to this, the other conventional tibial fixation device can be applied to patients with excessive interdental or missing teeth, but a large number of bone nails are used, in addition to causing a large amount of extra In addition to the wound to increase the risk of infection, the surgeon also needs to confirm that each nail does not injure the patient's roots and teeth, etc., so the operation is more time-consuming and labor-intensive, and still has the wire and easy to stab patients oral and surgical performers And other issues.

In view of this, the conventional tibial fixation device does have the need to improve.

In order to solve the above problems, the present invention provides a tibial fixation device which can be selected according to a patient's mandibular condition (for example, whether the patient has a missing tooth or an excessive interdental space, and a condition of the mandibular injury). The positioning member fastens the patient's lower jaw quickly and accurately.

The following directionality or its similar terms, such as "upper (top)", "lower", "inside", "outside", "side", etc., mainly refer to the direction of the additional drawing, each The directionality or its approximation is only used to assist in the description and understanding of the embodiments of the invention, and is not intended to limit the invention.

The patella fixation device of the present invention comprises: a sleeve having a first screw hole at one end and a second screw hole at the other end, the first screw hole and the second screw hole having a spiral direction opposite to each other; a screw having a first threaded portion and a first assembling portion, the first threaded portion being screwed to the first threaded hole, the first assembling portion being exposed outside the sleeve; and a second screw having a second a threaded portion and a second assembly portion, the second threaded portion is screwed to the second screw hole, and the second assembly portion is exposed Outside the sleeve; and two positioning members are respectively coupled to the first assembly portion and the second assembly portion.

Accordingly, the tibial fixation device of the present invention can select a suitable positioning member according to the patient's mandibular condition (for example, whether the patient has a missing tooth or an excessive interdental space, and a condition of the mandibular injury). Fast and precise fixation of the patient's mandible, greatly improving the ease of operation and efficiency of the patient's mandible, allowing the surgeon to concentrate on performing the jaw reconstruction without consuming a lot of mental and time in alignment Fixing the patient's mandible can not only simplify the operation, reduce the operation time, but also ensure the accurate alignment of the mandible, so that the patient's face can return to the same appearance position as before surgery, and improve the patient's postoperative operation. Self-confidence in social activities.

The first screw hole is coaxial with the center of the second screw hole.

Wherein, the first screw hole and the second screw hole have the same pitch; the structure enables the first screw and the second screw to maintain the same moving speed and distance.

Wherein, the middle portion of the sleeve is set to a hexagonal column shape; the structure is easy to be formed and can reduce the occurrence of slippage when the control sleeve rotates.

The positioning member has a ring body and a rotating member, and one end of the rotating member is assembled and fixed to the first assembly portion of the first screw or the second assembly portion of the second screw, and the other end of the rotating member is rotatable. The ring is connected to the ring; the structure allows the ring to rotate according to the angle of the patient's teeth, and has the effect of improving the smoothness of the operation of the patient's teeth.

Wherein, the ring body has a C shape and has an opening; the structure provides the ring body with better elastic deformation ability to fit the ring body into the patient's teeth and remove.

Wherein, the rotating member is provided with an upper locking piece and a lower locking piece, the locking piece is provided with a consistent hole, the lower locking piece is provided with a locking hole, the first assembly part of the first screw or the second part of the second screw The assembly portion has a convex ring shape and penetrates between the upper locking piece and the lower locking piece, and the rotating member is further inserted through a through hole of the upper locking piece and the first assembly portion or the second assembly portion by a screw, and The screw is locked to the locking hole of the lower locking piece; the structure is simple and convenient to manufacture and assemble, and has the effects of reducing manufacturing cost and improving assembly convenience.

The positioning member includes a connecting portion and a plurality of locking portions, and the connecting portion is assembled and fixed to the first assembly portion of the first screw or the second assembly portion of the second screw, and the locking portion is connected to the locking portion. The connecting portion is provided with a plurality of perforations; the structure makes the tibial fixation device applicable to a case where the patient has a missing tooth or an excessive interdental space.

Wherein, the connecting portion is provided with a locking piece and a lower locking piece, the locking piece is provided with a consistent hole, the lower locking piece is provided with a locking hole, the first assembly part of the first screw or the second part of the second screw The assembly portion has a convex ring shape and penetrates between the upper locking piece and the lower locking piece, and the connecting portion is further inserted through a through hole of the upper locking piece and the first assembly portion or the second assembly portion by a screw, and The screw is locked to the locking hole of the lower locking piece; the structure is simple and convenient to manufacture and assemble, and has the effects of reducing manufacturing cost and improving assembly convenience.

Wherein the first assembly portion is disposed at one of the axial ends of the first screw, and the first screw has a maximum outer diameter at the other axial end of the first thread portion to the first screw; The second assembly portion is disposed at one of the axial ends of the second screw, and the inside of the second screw is provided with a through groove, and the through groove is open at the other axial end of the second screw. The through slot has a minimum inner diameter that is greater than a maximum outer diameter of the first screw; the structure increases the extent to which the sleeve controls the first screw to be close to or away from the second screw.

Wherein, the first screw and the second screw have the same structure, so that no classification is required in manufacturing, packaging and assembly, which helps to improve the convenience in manufacturing, storage and assembly.

Wherein the first assembly portion is disposed at one of the axial ends of the first screw, and the other axial end portion of the first screw defines a first stop portion, the first threaded portion is located at the first assembly portion The end surface of the first stopping portion is in a planar shape with the first stopping portion; the structure can firmly abut the first screw and the second screw, and the first screw and the second screw can be avoided Deformation is misplaced.

1‧‧‧ sleeve

11‧‧‧First screw hole

12‧‧‧Second screw hole

2‧‧‧First screw

21‧‧‧First threaded part

22‧‧‧First Assembly Department

23‧‧‧ First stop

3‧‧‧Second screw

31‧‧‧Second thread

32‧‧‧Second Assembly Department

33‧‧‧second stop

34‧‧‧Drawing slot

4‧‧‧ teeth ring

41‧‧‧Act

42‧‧‧Rotating parts

421‧‧‧Locking piece

422‧‧‧Unlocking piece

423‧‧‧through holes

424‧‧‧Keyhole

425‧‧‧ screws

5‧‧‧ bone plate

51‧‧‧Connecting Department

511‧‧‧Locking piece

512‧‧‧Unlocking piece

513‧‧‧through holes

514‧‧‧Keyhole

515‧‧‧ screws

52‧‧‧Locking

521‧‧‧Perforation

B1, B2‧‧‧ cracked bone

B3, B4‧‧‧ broken bone

D1‧‧‧Maximum outer diameter

D2‧‧‧minimum inner diameter

P‧‧‧ bone nail

Fig. 1 is a perspective exploded perspective view showing a first embodiment of the present invention.

Fig. 2 is a cross-sectional structural view showing the first screw of the first embodiment of the present invention without penetrating into the second screw.

Fig. 3 is a cross-sectional structural view showing the first screw of the first embodiment of the present invention penetrating into the second screw.

Fig. 4a is a partially enlarged cross-sectional structural view showing the first embodiment of the present invention in combination with a mouth loop.

Figure 4b is a partially enlarged cross-sectional structural view of the first embodiment of the present invention in combination with a bone plate.

Fig. 5 is a schematic view showing the implementation of the first embodiment of the present invention when there is a fractured bone repaired by a dental patient.

Fig. 6 is a schematic view showing the implementation of the first embodiment of the present invention in the case of a bone fracture repaired by a toothless patient.

Fig. 7 is a schematic view showing the implementation of the first embodiment of the present invention when the broken bone is repaired.

Figure 8 is a perspective view showing a perspective exploded structure of a second embodiment of the present invention.

Figure 9 is a cross-sectional structural view showing a second embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; In the first embodiment of the tibial fixation device of the present invention, the material of the tibial fixation device can be pure titanium, titanium alloy (such as Ti6Al4V, TiNi, Ti15Mo, etc.), medical stainless steel (such as: 304, 316, 410 stainless steel, etc.) Or medical cobalt chromium molybdenum alloy, etc., and formed by at least one of 3D printing, CNC machining, casting or wire cutting. The patella fixation device substantially includes a sleeve 1 , a first screw 2 , a second screw 3 , and two positioning members. The first screw 2 and the second screw 3 are screwed to the sleeve 1 respectively. Two positioning members are respectively exposed outside the sleeve 1 and combined with the first screw 2 and the second screw 3; this embodiment The positioning member is described as a dental ring 4 or a bone plate 5, but is not limited thereto.

The sleeve 1 has a hollow interior, and the sleeve 1 has two axially opposite ends, one end of which is provided with a first screw hole 11 for the first screw 2 to be screwed, and the other end is provided with a second screw hole 12 for The second screw 3 is screwed, and the rotation of the sleeve 1 controls the first screw 2 and the second screw 3 to move in a direction close to or away from each other. The invention does not limit the outer shape of the sleeve 1, wherein the outer shape of the sleeve 1 can be set to a non-smooth cylindrical shape, thereby reducing the occurrence of slippage when the sleeve 1 is rotated; for example, but not Restrictively, in this embodiment, the intermediate portion of the sleeve 1 can be selected to be a hexagonal column shape which is simple and easy to process.

It should be noted that the first screw hole 11 and the second screw hole 12 have opposite spiral directions. That is, when the first screw hole 11 has a left-handed internal thread, the second screw hole 12 has a right-handed internal thread; and when the first screw hole 11 has a right-handed internal thread, the second screw hole 12 has Left-handed internal thread. In addition, the center of the first screw hole 11 and the second screw hole 12 is preferably set to be coaxial; the pitch of the first screw hole 11 and the second screw hole 12 can be set to be the same, so that the first screw 2 And the second screw 3 can maintain the same moving speed and distance.

Referring to FIGS. 1 to 3, the structure of the first screw 2 and the second screw 3 can be the same or different according to the needs of use. In this embodiment, one of the first screw 2 and the second screw 3 is selected. It is set to a pipe structure with a relatively large diameter, and the other is a rod structure with a relatively small diameter. When the two are close to each other, the rod with a smaller diameter can penetrate into the inside of the pipe body with a larger diameter to increase Relatively flexible space.

In detail, the first screw 2 has a first threaded portion 21 and a first assembly portion 22, and the first screw portion 2 is screwed to the first screw hole 11 by the first threaded portion 21, and the first screw portion 21 is screwed into the first screw hole 11 An assembly portion 22 remains exposed outside the sleeve 1 to assemble and connect one of the mouthpieces 4 or the bone plate 5 (the second and third figures are illustrated by way of example, but not limited to the assembly of the bone plate 5). In this embodiment, the first assembly portion 22 can be disposed at one of the axial ends of the first screw 2 and be formed into a convex ring shape, and the other axial end portion of the first screw 2 forms a first portion. a stop portion 23, the first threaded portion 21 is located The first assembly portion 22 of the first screw 2 is between the first stop portion 23. The first screw 2 has a maximum outer diameter D1 at the first threaded portion 21 and the stop portion 23.

Similarly, the second screw 3 has a second threaded portion 31 and a second assembly portion 32. The second screw portion 3 is screwed to the second screw hole 12 by the second threaded portion 31, and the second screw hole The assembly portion 32 is kept exposed outside the sleeve 1 so as to be assembled and connected to the other mouth ring 4 or the bone plate 5 (the second and third figures are illustrated by way of example, but not limited to the assembly of the bone plate 5). In this embodiment, the second assembly portion 32 can be disposed at one of the axial ends of the second screw 3, and is formed into a convex ring shape, and the other axial end portion of the second screw 3 forms a first portion. The second thread portion 31 is located between the second assembly portion 32 of the second screw 3 and the second stopper portion 33. The main difference between the second screw 3 and the first screw 2 is that the inside of the second screw 3 is further provided with a through groove 34, and the through groove 34 is open at the second stopping portion 33. The groove 34 has a minimum inner diameter D2, and the minimum inner diameter D2 is greater than the maximum outer diameter D1 of the first screw 2.

Accordingly, as shown in FIG. 3, the sleeve 1 is rotated to control the movement of the first screw 2 and the second screw 3 in the opposite direction, and is not in the first screw 2 When the stopping portion 23 and the second stopping portion 33 of the second screw 3 pass through the same radial plane, the sleeve 1 is continuously rotated, so that the first threaded portion 21 and the stopping portion 23 of the first screw 2 are rotated. The sleeve extends into the through groove 34 of the second screw 3, thereby lifting the sleeve 1 to control the amplitude of the first screw 2 being close to or away from the second screw 3.

Referring to Figures 1 and 4a, the mouthpiece 4 has a ring body 41 and a rotating member 42. The ring body 41 can be C-shaped and has an opening to provide the ring body 41 with better elastic deformation capability. The ring 41 is placed over the patient's teeth and removed. One end of the rotating member 42 can be assembled and fixed to the first assembly portion 22 of the first screw 2 or the second assembly portion 32 of the second screw 3, so that the rotating member 42 and the first screw 2 or the second portion A completely fixed state of zero degree of freedom is achieved between the screws 3; the other end of the rotating member 42 is rotatably coupled to the ring body 41 so that the ring body 41 can be rotated according to the angle of the patient's teeth for smooth insertion into the patient's teeth.

For example, but not limited to, the rotating member 42 of the embodiment is provided with an upper locking piece 421 and a lower locking piece 422 spaced apart from each other at an end away from the ring body 41. The locking piece 421 is provided with a consistent hole 423. The lower locking piece 422 is provided with a locking hole 424. The first assembly portion 22 of the first screw 2 having a convex ring shape can penetrate between the upper locking piece 421 and the lower locking piece 422 of the toothed ring 4, and the rotating member 42 is further penetrated by the upper locking piece 421 by a screw 425. The through hole 423 and the first assembly portion 22 are screwed and locked with the locking hole 424 of the lower locking piece 422, so that one end of the rotating member 42 is assembled and fixed to the first assembly portion 22 of the first screw 2. . The rotating member 42 of the other mouth ring 4 is identical in structure to be assembled and fixed to the second assembly portion 32 of the second screw 3. In other embodiments, the rotating member 42 is fixed to one end of the first screw 2 or the second screw 3, and may also be a single-axis joint, a universal joint, a ball joint with a quick-release screw or a thread clamping. Or push the fixed structure.

Referring to FIGS. 1 and 4b, the bone plate 5 includes a connecting portion 51 and a plurality of locking portions 52. The connecting portion 51 can be assembled and fixed to the first assembly portion 22 of the first screw 2 or the second screw. The second assembly portion 32 of the third assembly portion 32 reaches a completely fixed state of zero degree of freedom between the connecting portion 51 and the first screw 2 or the second screw 3; each of the locking portions 52 is connected to the connecting portion 51 and is provided There are a plurality of perforations 521 for the nails (not shown) to be inserted through the lock.

For example, but not limited to, the connecting portion 51 of the embodiment is provided with a locking piece 511 and a locking piece 512 spaced apart from each other on a surface of the bone plate 5. The locking piece 511 is provided with a consistent hole 513. The lower locking piece 512 is provided with a locking hole 514. The first assembly portion 22 of the first screw 2 having a convex ring shape can penetrate between the upper locking piece 511 of the bone plate 5 and the lower locking piece 512, and the bone plate 5 is adjusted relative to the first screw. After the angle of 2, a screw 515 is inserted through the through hole 513 of the upper locking piece 511 and the first assembly portion 22, and is screwed with the locking hole 514 of the lower locking piece 512, so that the connecting portion 51 can be The first assembly portion 22 of the first screw 2 is assembled and fixed, and the bone plate 5 and the first screw 2 are maintained at a predetermined angle. The connecting portion 51 of the other bone plate 5 has the same structure to be assembled and fixed to the second assembling portion 32 of the second screw 3. In other embodiments, the connecting portion 51 can also be set as a single-axis joint, a universal joint, a ball joint with a quick-release screw or a thread clamping or a push fastening. Ordering structure.

Referring to FIG. 5, according to the above configuration, when the patella fixation device of the present invention is used in the sacral reconstruction operation, if the patient's lower jaw bone is broken and the patient still has the tooth T, there is no problem that the interdental space is too large. Alternatively, the foregoing two teeth ring 4 can be respectively coupled to the first screw 2 and the second screw 3; then the sleeve 1 is rotated, the two teeth ring 4 is adjusted to an appropriate distance, and the two teeth are used. The ring 4 is respectively fitted to one of the teeth T on the bifurcation B1 and B2 of the patient's lower jaw bone, so that the bifurcation B1 and B2 of the patient's lower jaw can be completely and quickly fixed for debridement and Continued squat reconstruction surgery.

Please refer to Figure 6. If the patient has a problem with missing teeth, the braces 4 (as shown in Figure 4) will have no positioning, and if the patient has a problem of excessive interdental space, the braces 4 will be used. There is a situation in which it is loose and cannot be stably fixed. At this time, the aforementioned two bone plates 5 may be respectively coupled to the first screw 2 and the second screw 3, and the sleeve 1 is rotated to adjust the two bone plates 5 By properly spacing the two bone plates, the two bone plates 5 can be locked to the inner side of the bifurcation B1 and B2 of the patient's lower jaw to quickly and accurately fix the patient's lower jaw bone quickly and accurately. The two split bones B1, B2, in order to debride and continue the squat reconstruction surgery.

Referring to FIG. 7 , in addition, the patella fixation device of the present invention can also be applied to a partial defect of the patient's lower jaw, that is, the second bone plate 5 can be selectively coupled to the first screw 2 and the same. The second screw 3 rotates the sleeve 1 to adjust the two bone plates 5 to an appropriate distance, and then uses the plurality of bone nails P to lock the two bone plates 5 to the second fracture of the patient's lower jaw bone. On the same side of the bones B3 and B4, the two broken bones B3 and B4 of the patient's lower jaw can be completely and quickly fixed for debridement and subsequent squat reconstruction.

Referring to Figures 8 and 9, which are a second embodiment of the tibial fixation device of the present invention, the second embodiment of the present invention is substantially the same as the first embodiment described above, and the main difference is that the second embodiment of the present invention For example, the second screw 3 is selected to have the same structure as the first screw 2. The end surface of the first stopping portion 23 of the first screw 2 can be set to a planar shape, and the second screw 3 is second. The end faces of the stoppers 33 are also the same so as to be stably abutted when the first screw 2 and the second screw 3 are closest to each other, so that the surgeon can obtain the feeling of stopping the rotation of the sleeve 1, and the first can be avoided. The screw 2 and the second screw 3 are deformed and displaced.

The tibial fixation device of the present embodiment is more suitable for the case where the first screw 2 and the second screw 3 are not close to or away from each other, and the first screw 2 and the second screw 3 having the same structure are used. It eliminates the need for sorting during manufacturing, packaging, and assembly, helping to improve ease of manufacture, storage, and assembly.

In summary, the tibial fixation device of the present invention can be selected according to the condition of the patient's mandible (for example, whether the patient has missing teeth or excessive interdental space, and the condition of the mandibular injury). The positioning member fastens and accurately fixes the patient's mandible, greatly improving the convenience and efficiency of fixing the patient's lower jaw bone, allowing the surgeon to concentrate on performing the lower jaw reconstruction without consuming a lot of mental and time. The contralateral and fixed patient's mandible can not only simplify the operation, reduce the operation time, but also ensure the accurate alignment of the mandible, so that the patient's face can return to the same appearance position as before surgery, improve the patient's surgery. Self-confidence after social activities.

Wherein, when the positioning member is a dental ring, the action of fixing the lower jaw does not cause additional wounds to the patient; and when the positioning member is a bone plate, the used nail can cause additional wounds to the patient, but In the past, it was necessary to lock a bone nail between each tooth to fix the dental arch plate on the gum. The number of bone nails used in the patella fixation device of the present invention is greatly reduced, and not only the additional wound can be reduced. The number of infections is reduced, and the number of times the surgeon has to confirm that each nail is not injured and the roots and teeth of the patient are reduced, so that the overall convenience and efficiency can be greatly improved. Furthermore, the use of the tibial fixation device of the present invention does not require the use of a binding wire, and therefore does not have the risk of the patient and the surgeon performing the wire puncture, and the safety of use is good.

Although the present invention has been disclosed by the above-described preferred embodiments, it is not intended to limit the invention, and it is apparent to those skilled in the art without departing from the spirit and scope of the invention. The various modifications and variations of the embodiments are still within the technical scope of the invention. The scope of the invention is defined by the scope of the appended claims.

1‧‧‧ sleeve

11‧‧‧First screw hole

12‧‧‧Second screw hole

2‧‧‧First screw

21‧‧‧First threaded part

22‧‧‧First Assembly Department

23‧‧‧ First stop

3‧‧‧Second screw

31‧‧‧Second thread

32‧‧‧Second Assembly Department

33‧‧‧second stop

34‧‧‧Drawing slot

4‧‧‧ teeth ring

41‧‧‧Act

42‧‧‧Rotating parts

421‧‧‧Locking piece

422‧‧‧Unlocking piece

423‧‧‧through holes

424‧‧‧Keyhole

425‧‧‧ screws

5‧‧‧ bone plate

51‧‧‧Connecting Department

511‧‧‧Locking piece

512‧‧‧Unlocking piece

513‧‧‧through holes

514‧‧‧Keyhole

515‧‧‧ screws

52‧‧‧Locking

521‧‧‧Perforation

Claims (12)

A patella fixation device comprises: a sleeve having a first screw hole at one end and a second screw hole at the other end, the first screw hole and the second screw hole having a spiral direction opposite to each other; a first screw, The first threaded portion is screwed to the first screw hole, the first assembly portion is exposed outside the sleeve; and the second screw portion has a second threaded portion And a second assembly portion, the second threaded portion is screwed to the second screw hole, the second assembly portion is exposed outside the sleeve; and two positioning members are respectively coupled to the first assembly portion and the second Assembly department. The patella fixation device of claim 1, wherein the first screw hole is coaxial with a center of the second screw hole. The patella fixation device of claim 1, wherein the first screw hole and the second screw hole have the same pitch. The tibial fixation device according to claim 1, wherein the middle portion of the sleeve is hexagonal columnar. The patella fixation device of claim 1, wherein the positioning member has a ring body and a rotating member, and one end of the rotating member is assembled and fixed to the first assembly portion or the second portion of the first screw. a second assembly of the screw, the other end of the rotating member being rotatably coupled to the ring. The tibial fixation device according to claim 5, wherein the ring body has a C shape and has an opening. The patella fixation device of claim 5, wherein the rotating member is provided with an upper locking piece and a lower locking piece, the locking piece is provided with a consistent hole, and the lower locking piece is provided with a locking hole, the first locking piece a first assembly portion of a screw or a second assembly portion of the second screw is convexly looped and penetrates between the upper locking piece and the lower locking piece, and the rotating member is further penetrated by the screw through the upper locking piece The hole and the first assembly portion or the second assembly portion are screwed to the locking hole of the lower locking piece. The patella fixation device according to the first aspect of the invention, wherein the positioning member comprises a connecting portion and a plurality of locking portions, the connecting portion being assembled and fixed to the first assembly portion of the first screw or the first portion a second assembly portion of the two screws, each of the locking portions connecting the connecting portion and provided with a plurality of perforations. The patella fixation device of claim 8, wherein the connection portion is provided with an upper locking piece and a lower locking piece, the locking piece is provided with a consistent hole, and the lower locking piece is provided with a locking hole, the first locking piece a first assembly portion of a screw or a second assembly portion of the second screw is convexly looped and penetrates between the upper locking piece and the lower locking piece, and the connecting portion is further penetrated by the screw through the upper locking piece The hole and the first assembly portion or the second assembly portion are screwed to the locking hole of the lower locking piece. The patella fixation device according to any one of claims 1 to 9, wherein the first assembly portion is disposed at one of the axial ends of the first screw, and the first screw is at the first The threaded portion has a maximum outer diameter at the other axial end of the first screw; the second assembly portion is disposed at one of the axial ends of the second screw, and the inside of the second screw is provided with an extension a slot that is open at the other axial end of the second screw, the through slot having a minimum inner diameter that is greater than a maximum outer diameter of the first screw. The tibial fixation device according to any one of claims 1 to 9, wherein the first screw and the second screw have the same structure. The patella fixation device according to claim 11, wherein the first assembly portion is disposed at one of the axial ends of the first screw, and the other axial end portion of the first screw forms a first a first threaded portion is located between the first assembly portion and the first stop portion, and an end surface of the first stop portion is in a planar shape.