WO2014200233A1 - Calcaneus plate and calcaneus plate system - Google Patents

Abstract

A calcaneus plate for treating the fracture of the calcaneus, and a calcaneus plate system are disclosed. The calcaneus plate of the present invention comprises first to fourth plate segments. The first plate segment is horizontally arranged. The second plate segment is upwardly extended in a vertical direction crossing a horizontal direction, from the back end of the first plate segment. The third plate segment is extended in a diagonal direction between the first plate segment and the second plate segment, from a point where the first plate segment and the second plate segment meet. The fourth plate segment is extended from the end of the third plate segment toward the front end of the first plate segment. At least one locking hole is formed respectively at the first to fourth plate segments. An internal thread is formed at the locking hole. The calcaneus plate system of the present invention comprises: a calcaneus plate; and a locking screw to be fastened to the internal thread of the calcaneus plate. The present invention is designed to be suitable for the outer border of Korean calcaneus, and it is possible to conveniently carry out fracture surgery by readily combining the locking screw to the bone at a desired angle within a predetermined range.

Description

Calcaneal plate and calcaneal plate system

The present invention relates to a calcaneal plate, and more particularly to a calcaneal plate and calcaneal plate system for treating fractures of calcaneus or heel bone.

Bone plate system facilitates treatment by pressing bone fragments (bone fragments) for fracture treatment and pulling the bone fragments in close contact with each other. The bone plate system includes a bone plate and a bone screw. The plate may include a hole in which an internal thread is formed and a hole in which the internal thread is not formed. The screw includes a locking screw in which an external thread is formed in the head, and a non-locking screw in which the external thread is not formed in the head. Both the locking and nonlocking screws have shafts formed with male threads for engaging the bones.

The locking screw may be coupled to the female screw of the bone plate formed on the head to fix the angle at which the screw shaft is coupled to the bone. The central axis of the locking screw is coupled to be coaxial with the central axis of the internal thread. In addition, it is possible to prevent the locking screw loosened or loosened by the dynamic load acting on the bone fragments and the bone plate after surgery. However, the locking screw is limited in its ability to bind bone plates to compress bone fragments that affect fracture treatment.

The male thread of the non-locking screw can be coupled to the bone at various angles. However, the non-locking screw is not fixed to the bone plate because no male thread is formed in the head. Thus, the non-locking screw may change the angle between the plate and the screw during or after surgery. In addition, the dynamic load acting on the bone fragments and bone plates after surgery may cause the non-locking screws to loosen or loosen, resulting in insufficient treatment of the fracture.

That is, the locking screw can fix the joint angle of the bone pieces, but the insertion angle is limited, there is a disadvantage that the pressing ability is limited. Non-locking screws can be inserted into the bone at various angles and squeeze the bone fragments, but have the disadvantage of being loose.

“Bone Plates” in US Pat. No. 6,669,701 discloses at least one combination hole in which both locking and non-locking screws can be used. The combination hole has a portion in which a thread is formed and a portion extending in the longitudinal direction and in which the thread is not formed. Non-locking screws are inserted at various angles in the unthreaded portions of the combination holes to be used to join the bone pieces and to provide a pressing force. The locking screw is inserted into the threaded portion of the combination hole to join the bone pieces and fix the engaged angle. However, the locking screw has a disadvantage that the adjustment of the angle to the bone is limited.

On the other hand, the calcaneal plate is one of the bone plates for fixing the fracture of the calcaneal. The calcaneus is the bone that forms the base of the heel, which is the largest of the ankle bones (ankle bone) and finally supports the weight on the ground. The calcaneus mainly consists of spongy bone, which is the most frequent fracture of the ankle bone, and the fracture pattern is the most common occurrence.

The "Calcaneal plate" of US Pat. No. 8,057,520 is three-dimensional so that the lateral shape can adhere to the surface of the calcaneus. The ovaloid body portion of the calcaneal plate includes a superior plate segment, an anterior plate segment, and an inferior plate segment. The interior portion has at least one window fenestration defining the neighboring boundaries of the upper plate segment, the front plate segment, and the lower plate segment. The calcaneal plate is a plurality of screw holes that are formed to be attached to the calcaneus by fastening the screws, and locking holes, translation slots and compression screws. (Small holes) formed for fixing the hole, the K-wire so as to be formed for the fastening of the (Compression screw).

However, the conventional bone plate system and calcaneal plate as described above are not suitable for the calcanite size of Koreans, so there is a problem in that it is inadequate for treating calcaneal fractures in Koreans. In particular, the screw holes are not matched with the calcaneal margin of the Korean people, so the screw can not be fastened frequently, which is hampered by the surgery. Therefore, it is required to develop a calcaneal plate that can be used for calcaneal fractures in Koreans.

The present invention is to solve various problems of the conventional bone plate system and calcaneal plate as described above. It is an object of the present invention to provide a new calcaneal plate and calcaneal plate system that is designed to be suitable for the calcaneal margin of Koreans.

Another object of the present invention is to provide a calcaneal plate and calcaneal plate system which can easily engage the locking screw at a desired angle within a defined range.

Another object of the present invention is to provide a calcaneal plate and calcaneal plate system which can selectively use locking screws and non-locking screws.

According to one aspect of the invention, a calcaneus plate is provided. The calcaneal plate according to the present invention comprises: a first plate segment disposed along the transverse direction; A second plate segment extending upwardly along a longitudinal direction intersecting the transverse direction from a rear end of the first plate segment; A third plate segment extending in a diagonal direction between the first plate segment and the second plate segment from a portion where the first plate segment and the second plate segment meet; At least one locking hole including a fourth plate segment extending from the end of the third plate segment toward the front end of the first plate segment and formed in each of the first to fourth plate segments and having a female thread formed therein; Include.

In addition, at least one small hole for fixing the K wire to each of the first to fourth plate segments and at least one pressing hole for fastening the non-locking screw is formed. The fourth plate segment is connected to the front end of the first plate segment, and neighboring boundaries of the first plate segment, the third plate segment and the fourth plate segment are defined by the window bet.

The calcaneal plate system according to another aspect of the present invention includes a calcaneal plate and a locking screw fastened to the female screw of the calcaneal plate. The locking screw has a tapered head along the central axis, a shaft extending from the head, a first male screw formed on the head to engage the first female screw, and a shaft formed on the shaft to be coupled to the bone. A second male screw is provided. When the first male screw is fastened to the first female screw, the depth of the bone having the largest outer diameter among the bones of the first male screw is greater than the height of the mountains of the first female screw so that the locking screw can be fastened inclined with respect to the central axis of the locking hole. It is largely formed.

The calcaneal plate and calcaneal plate system according to the present invention are designed to be suitable for the calcaneal margin of Koreans, and the locking screw can be easily coupled to the bone at a desired angle within a predetermined range, so that the surgeon can conveniently fracture the surgery. It can be carried out. That is, the surgeon may fasten one locking screw in a predetermined direction with respect to the plate or in various directions. In addition, locking screws and non-locking screws can be selectively used to treat calcaneal fractures efficiently.

1 is a front view showing a state in which the calcaneal plate of the first embodiment according to the present invention is coupled to the calcaneal.

2 is a front view showing the configuration in which the calcaneal plate of the first embodiment according to the present invention is disposed in the contour of the calcaneal.

Figure 3 is a perspective view showing the configuration of the calcaneal plate of the first embodiment according to the present invention.

Figure 4 is a front view showing the configuration of the calcaneal plate of the first embodiment according to the present invention.

Figure 5 is a perspective view showing the configuration of the calcaneal plate of the second embodiment according to the present invention.

6 is a front view showing the configuration in which the calcaneal plate of the first embodiment according to the present invention is disposed in the contour of the calcaneal.

Figure 7 is a front view showing the configuration of the calcaneal plate of the second embodiment according to the present invention.

8 is a cross-sectional view showing a locking hole in the calcaneal plate in the calcaneal plate system according to the present invention.

FIG. 9 is a schematic view showing a step of processing the locking hole shown in FIG. 8. FIG.

FIG. 10 is a view partially showing the nose portion of the bite for machining the locking hole shown in FIG.

11 is a front view showing the configuration of the locking screw in the calcaneal plate system according to the present invention.

It is a schematic diagram which shows the process of processing the locking screw shown in FIG.

FIG. 13 is a view partially showing the nose portion of the bite for machining the locking screw shown in FIG.

14 is a cross-sectional view showing a configuration in which the locking screw is concentrically fastened to the locking hole in the calcaneal plate system according to the present invention.

15 is a cross-sectional view showing a configuration in which the locking screw is inclined fastening to the locking hole in the calcaneal plate system according to the present invention.

16 is a cross-sectional view showing a configuration in which the locking screw is concentrically fastened to the locking hole of the calcaneal plate of another embodiment in the calcaneal plate system according to the present invention.

17 is a cross-sectional view showing a configuration in which the locking screw is inclined to the locking hole of the calcaneal plate of another embodiment in the calcaneal plate system according to the present invention.

18 is a cross-sectional view showing a configuration in which the non-locking screw is concentrically fastened to the locking hole of the calcaneal plate of another embodiment in the calcaneal plate system according to the present invention.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments associated with the accompanying drawings.

Hereinafter, preferred embodiments of the calcaneal plate according to the present invention will be described in detail with reference to the accompanying drawings.

First, a first embodiment of a calcaneal plate according to the invention is shown in FIGS. 1 to 4. 1 to 4, the calcaneal plate 100 of the first embodiment according to the present invention is not only excellent in mechanical properties to maintain a stable function in vivo for the treatment of the calcanus 10, but also biocompatible It is preferable to be made of a material having biocompatibility and biofuntionability, for example, titanium, but is not limited thereto. The calcaneal plate 100 of the first embodiment according to the present invention comprises a first plate segment 102, a second plate segment 104, a third plate segment 106 and a fourth plate segment 108. Each of the first to fourth plate segments 102, 104, 106, and 108 is formed in a strip shape. Each of the first to fourth plate segments 102, 104, 106, 108 has an upper surface 110 and a lower surface 112 disposed toward the calcaneus 10.

The first plate segment 102 is arranged at the bottom of the calcaneal plate 100 along the transverse direction (X-axis direction in the X-Y plane). The second plate segment 104 extends upwardly along the longitudinal direction (the Y-axis direction in the X-Y plane) from the rear end of the first plate segment 102. The third plate segment 106 extends between the first plate segment 102 and the second plate segment 104 from a corner 114 where the first plate segment 102 and the second plate segment 104 are connected. It extends along the diagonal (A). The fourth plate segment 108 extends from the end of the third plate segment 106 toward the front end of the first plate segment 102.

1 and 3, the calcaneus outline 20 of a normal Korean man and woman is shown. As a result of measuring the circumference of the calcaneal margin of about 280 Korean men and women, the calculus 10 has the size of width (L) of 68 ± 5 mm and length (H) of 37 ± 5 mm. The Gissane angle (GA) of normal males and females, respectively, was 117.3 ± 7 ° (Degree) and 115.6 ± 7 °. Bohler angles (BA) for normal males and females, respectively, were 33.3 ± 4.8 ° and 33.4 ± 4.6 °.

As shown in FIG. 4, the calcaneal plate 100 of the first embodiment according to the present invention is sized to fit the calcanic clearance contour 22 disposed about 4 mm inward from the calcaneal contour 20 of Korean normal male and female. Consists of The horizontal length L ₁ of the calcaneal plate 100 is approximately 41 mm, the height H ₁ of the second plate segment 104 is approximately 26 mm, and the third plate from the bottom of the second plate segment 104. The height H ₂ to the top of the segment 106 is approximately 33 mm. The angle θ _{1 that} the second plate segment 104 makes with respect to the first plate segment 102 is approximately 90 °. The angle θ ₂ formed by the diagonal A with respect to the longitudinal direction Y is approximately 40 °. The angle θ _{3 that} the fourth plate segment 108 makes with respect to the third plate segment 106 is approximately 100 °.

Referring back to FIGS. 1 through 4, a plurality of small holes 116 for fixing the K wire 30 are formed in the third plate segment 106 and the fourth plate segment 108. Two small holes are formed at intervals along the length of the third plate segment 106. One small hole is formed in the center of the fourth plate segment 108. K wire 30 is a pin (Pin) to be held in the bone pieces (12, 14) of the fractured calcaneus (10) to hold the bone pieces (12, 14). The end of the K wire 30 protruding out of the bone pieces 12 and 14 is fitted into the small hole 116 and fixed. 1, the bone pieces 12 and 14 are exemplarily shown to be cut by the cutting line 16. Concave surfaces 118 are formed on the outer surface of the fourth plate segment 108. A plurality of bone screws 40 or pins are inserted into the bone pieces 12 and 14. The tip of the pin protruding out of the bone pieces 12 and 14 is supported by the concave surfaces 118 to determine the position of the calcaneal plate 100 to temporarily fix the calcaneal plate 100.

Each of the first to fourth plate segments 102, 104, 106, and 108 has a plurality of locking holes 130 with a plurality of screw holes. The locking screw is fastened to the locking holes 130 and fixed to the bone. The locking holes 130 are formed at intervals along the length direction in each of the first to fourth plate segments 102, 104, 106, and 108. Preliminarily, one locking hole 130 is further formed at a portion where the third plate segment 106 and the fourth plate segment 108 meet each other. Round protrusions (Lobe) 120 are formed around each of the locking holes 130. The round protrusion 120 reduces foreign body feeling at the surgical site and prevents secondary damage such as inflammation after the surgery.

5 to 7 a second embodiment of the calcaneal plate according to the invention is shown. 5 to 7, the calcaneal plate 200 of the second embodiment is disposed about 4 mm inward from the calcaneal contour 20 of normal Korean men and women, similar to the calcaneal plate 100 of the first embodiment. It is configured in a size that fits the outline 22. First to fourth plate segments 202, 204, 206 and 208 of the calcaneal plate 200 of the second embodiment and the first to fourth plate segments 102, 104 and 106 of the calcaneal plate 100 of the first embodiment 108 has the same basic configuration. The calcaneal plate 200 of the second embodiment, like the calcaneal plate 100 of the first embodiment, has small holes 116, concave surfaces 118, round protrusions 120, and locking holes 130.

As shown in FIG. 7, the horizontal length L ₂ of the calcaneal plate 200 of the second embodiment is approximately 60.5 mm, and the height H ₃ of the second plate segment 102 is approximately 26 mm, The height H ₄ from the bottom of the second plate segment 204 to the top of the third plate segment 206 is approximately 30 mm. The angle θ _{4 that} the second plate segment 204 makes with respect to the first plate segment 202 is approximately 90 °. The angle θ ₅ formed by the diagonal A with respect to the longitudinal direction Y is approximately 40 °. The angle θ _{6 that} the fourth plate segment 108 makes with respect to the third plate segment 106 is approximately 110 °.

The fourth plate segment 208 is connected to the front end of the first plate segment 202. The first plate segment 202, the third plate segment 206 and the fourth plate segment 208 are arranged in triangular form. Adjacent boundaries of the first plate segment 202, the third plate segment 206 and the fourth plate segment 208 are defined by the window bet 240.

At least one compression hole 242 is formed in the first plate segment 102 and the second plate segment 104. Pressing hole 242 is a non-threaded hole is inserted into the non-locking screw is fixed to the bone. 5 to 7, two pressing holes 242 are formed in the first plate segment 102 and one is formed in the second plate segment 104. 242 may be formed in the third and fourth plate segments 108, and the number or position of the pressing holes 242 may be appropriately changed as necessary. Ear 244 extends obliquely upward from the front end of the first plate segment 102. The other locking hole 130 is formed in the ear 244. In some embodiments, ears 244 may be formed in second to third plate segments 204, 206, and 208 as desired.

Referring to Fig. 8, the locking holes of each of the calcaneal plates of the first and second embodiments will be described in more detail. The locking hole 130 of the calcaneal plate 100, 200 is a hole 132 penetrating through the upper surface 110 and the lower surface 112) and a first female screw 140 formed in the inner circumferential surface of the hole 132. Consists of The first female thread 140 includes a plurality of flanks connecting the plurality of valleys 142; 142-1 and 142-2, the plurality of mountains 144, and the valleys 142 and the mountains 144 neighboring each other. (Flank: 146). The first female thread 140 of the present embodiment is composed of a double thread, but may be composed of a single thread.

A hole and a female screw in the locking hole of the calcaneal plate will be described with reference to FIG. 9. As shown in FIG. 9 (a), the hole 132 before the first female thread 140 is formed has an upper portion 134, an intermediate portion 136 and a lower portion 138. The upper portion 134 is formed as a taper bore that is inclined at an angle with respect to the center axis line CA ₁ . The intermediate portion 136 is formed as a tapered bore that is inclined at a different angle from the upper portion 134. The lower portion 138 extends from the middle portion 136 and is formed to be perpendicular to the upper surface 110 and the lower surface 112. As shown in Fig. 9B, the upper part 134 is not machined with female threads. The first female thread 140 is formed in the lower portion 138. The second female thread 150 is formed in the middle portion 136.

The inner diameter of the second female thread 150 is greater than the inner diameter d ₁ of the first female thread 140. As shown in FIG. 9 (a), the inner diameter d ₁ of the first female thread 140 is the diameter d of the lower portion 138. Major diameter of first internal thread d ₂ of the first female thread 140 is the same. In some embodiments, the middle portion 136 may be deleted. 9 (c) shows the calcaneal plate 300 of the third embodiment. The calcaneal plate 300 of the third embodiment is bent to allow the lower surface 112 to be in close contact with the calcaneal. The calcaneal plate 300 of the third embodiment will be described in more detail below.

10 shows a bite used to machine a female thread according to the invention. Referring to FIG. 10, the female thread machining bite 160 has a nose 162 for processing the female thread. The nose end 164 has a constant width w ₁ . The angle of the thread (Angle of thread) is determined by the angle θ ₇ of the nose 162. When the width w ₁ of the nose end 164 is narrow with respect to the angle (theta) ₇ of the same nose 162, a deep-threaded female thread is formed. On the other hand, if the width w ₁ of the nose end 164 is high, a female screw having a shallow valley is formed. In the present embodiment, the angle θ ₇ of the nose 162 is 60 °, and the first female thread 140 is formed by the female thread-processing bite 160 having a width w ₁ of the nose end 164 of 0.16 mm. Was processed.

11 shows a locking screw constituting the calcaneal plate system according to the invention. Referring to FIG. 11, the locking screw 400 includes a head 402 and a shaft 404 extending along the axial direction from the head 402. The locking screw 400 may be made of titanium as with the calcaneal plates 100, 200. The upper surface 406 of the head 402 is composed of a round head formed in a round.

A first male screw 410 is formed in the head 402 to be fastened to the first female screw 140. The first male thread 410 includes a plurality of valleys 412, a plurality of hills 414, and a plurality of flanks 416 connecting neighboring valleys 412 and the hills 414. . In the present embodiment, the first male screw 410 is formed of two rows of screws for fastening with the first female screw 140. The second male screw 420 is formed along the outer circumferential surface of the shaft 404 to be coupled to the bone. A flute 422 is formed at the tip of the shaft 404 to enable self-tapping or self-drilling.

12, the locking screw will be described in more detail. The locking screw 400 shown in FIG. 12A is a state before the first male screw 410 and the second male screw 420 are processed. The head 402 of the locking screw 400 is formed on the outer circumferential surface thereof with a threaded portion 430 tapered at an angle with respect to the central axis CA ₂ . The thread processing part 430 is in the form of a reverse circular cone frustum tapered to reduce the diameter along the central axis CA ₂ . The threading part 430 is composed of an upper threading part 432 and a lower threading part 434 extending from the upper threading part 432 and tapered to reduce the diameter. In some embodiments, lower threaded portion 434 may be deleted.

FIG. 12B shows a state in which the second male screw 420 is processed on the shaft 404 of the locking screw 400. The upper threaded portion 432 has a maximum diameter D ₁ and a minimum diameter D ₂ . FIG. 12C shows a state where the first male screw 410 is processed in the screw machining portion 430 of the head 21. The maximum major diameter first external thread D _{3 of} the first male screw 410 is equal to the maximum diameter D ₁ of the threaded part 430. The minimum major diameter first external thread D _{4 of} the first male screw 410 is equal to the minimum diameter D ₂ of the threaded portion 430.

 FIG. 12 (d) shows a state in which the flute 422 is processed at the distal end of the shaft 404. 12 (e) shows a tool, for example a screw for accommodating a driver, for example a screwdriver, for driving the locking screw 400 into the bone on the upper surface 110 of the head 402 or for fastening to the first female thread 140. It shows a state in which a recess 408 is formed.

13 shows the bite used to machine the first male thread of the locking screw according to the invention. Referring to FIG. 13, the male thread machining bite 440 has a nose 442 for processing a first male thread. The nose end 444 has a constant width w ₂ . The angle of the thread is determined by the angle θ ₈ of the nose 442. When the width w ₂ of the nose end 444 is narrow with respect to the angle (theta) ₈ of the same nose 442, a deep male screw is formed. On the other hand, if the width w ₂ of the nose end 442 is wide, a male screw having a shallow valley is formed. The width w ₁ of the nose end 164 of the female threaded bite 160 is greater than the width w ₂ of the nose end 444 of the male threaded bite 440. In the present embodiment, the angle θ ₈ of the nose 442 is 60 ° and the first male thread 410 is provided by the male thread cutting bite 440 having a width w ₂ of the nose end 444 of 0.1 mm. Was processed.

Figure 14 shows a state in which the locking screw is fastened to the female screw of the calcaneal plate in the forward direction in the calcaneal plate system according to the present invention. As described above, the width w ₁ of the nose end 164 of the female thread machining bite 160 is larger than the width w ₂ of the nose end 444 of the male thread machining bite 440. Accordingly, the height of the thread h ₁ of the first male thread 410 is higher than the thread height h ₂ of the first female thread 140. That is, the bone depth DP ₁ of the bone having the maximum outer diameter among the valleys 412 of the first male thread 410 is greater than the thread height h ₂ of the peaks 144 of the first female thread 140. It is formed larger than the bone depth DP ₂ of the valleys 142. The thread height h ₁ of the first male thread 410 is substantially equal to the bone depth DP ₁ , and the thread height h ₂ of the first female thread 140 is substantially equal to the bone depth DP ₂ . Do.

When the first male screw 410 is fastened, a gap exists between the first male screw 410 and the first female screw 140. Switching from a central axis (CA ₂₎ of the locking hole 130, the central axis (CA ₁₎ and the locking screw (400) of the arrangement for coaxially rotating the locking screw 400, the flanks of the first internal thread 140 ( 146 and the flanks 416 of the first male thread 410 are in contact with each other. Spaces C ₁ and C ₂ are formed between the valleys 142 of the first female thread 140 and the peaks 414 of the first male thread 410. Since the head 402 has an inverted truncated cone shape, the closer to the shaft 404, the larger the volume (volume) of the gap (C ₂ > C ₁ ). When the locking screw 400 is coaxially fastened, the first of the peaks 414-1 of the first male thread 410 comes into contact with the middle portion 136 of the hole 132.

15 shows a state in which the locking screw is fastened in an oblique direction to the female screw of the calcaneal plate in the calcaneal plate system according to the present invention. 15, the locking screw 400 has its center axis (CA ₂₎ the extent of the locking aperture at an angle with the center axis (CA ₁₎ of the (130) (θ ₆₎ to be fastened at an angle Can be. Since the first male screw 410 is formed in the head 402 of the inverted truncated cone shape and the outer diameter decreases as it approaches the shaft 404, the distance from the first female screw 140 becomes closer as the shaft 404 approaches. It becomes bigger. Accordingly, the first male screw 410 is inclinedly fastened with the first female screw 140 formed on the lower portion 138 vertically penetrating the upper surface 110 and the lower surface 112 of each of the calcaneal plates 100 and 200. Can be.

The maximum value of the angle θ ₆ to which the first female screw 140 and the first male screw 410 may be inclined may be defined by the sizes of the intervals C ₁ and C ₂ . Interval is (C _1, C ₂₎ of the size is defined by a width (w ₂₎ of the female screw processing byte 160, the width (w ₁₎ and externally threaded processing byte 440 of. In addition, the size of the interval (C ₁ , C ₂ ) is defined by the degree of inclination of the taper of the threaded portion 430. In some embodiments, the ratio of the width w ₁ of the female threaded bite 160 to the width w ₂ of the male threaded bite 440 may range from approximately 1.2 to 1.8.

When the locking screw 400 is fastened to be inclined, a part of the first peak 414-1 of the first male thread 410 of the locking screw 400 is the first valley 142-1 of the first female thread 140. It comes into contact with the middle portion 136 while being inserted. As such, the locking screw 400 is obliquely fastened, thereby preventing interference between the locking screws 400 fastened to the calcaneus 10 during surgery, and fixing bone fragments in a direction effective for bone bonding. have.

On the other hand, in the bone plate system according to the present invention, the inner diameter (d ₁ ), the rib diameter (d ₂ ) of the first female screw 140 and the maximum outer diameter (D ₃ ), the minimum outer diameter of the first male thread 410. (D ₄ ) may be configured in the dimensions of Table 1 below. It is preferable to make the rib diameter (d ₂ ) and the maximum outer diameter (D ₃ ) the same. As described above, each of the first female thread 140 and the first male thread 410 is processed by the female thread and the male thread machining bite 440. The nose angles 162 and 442 angles θ ₄ and θ _{5 of the} female thread and the male thread machining bite 160 and 440 are 60 °. The width w ₁ of the nose end 164 of the female threaded bite 160 is 0.16 mm, and the width w ₂ of the nose end 444 of the male threaded bite 440 is 0.1 mm. When the first female screw 140 and the first male screw 410 having the dimensions shown in [Table 1] were formed, the maximum value of the angle at which the locking screw 400 can be inclined can be approximately 10 °. The thickness of the calcaneus plates 100 and 200 was in the range of approximately 1.6 mm to 2.0 mm.

Table 1 Example 1st female thread 1st external thread d ₁ (mm) d ₂ (mm) D ₃ (mm) D ₄ (mm) One 3.6 3.0 3.6 3.3 2 4.3 3.5 4.3 3.9 3 5.0 4.3 5.0 4.65

16 shows another embodiment of a calcaneal plate system according to the present invention. Referring to Figure 2 (c) and Figure 16 together, in the calcaneal plate system of another embodiment the calcaneal plate 300 is bent to closely adhere to the calcaneal. When the calcaneal plate 300 is bent, the gaps C ₁ and C ₂ between the first female thread 140 and the first male thread 410 should not be removed. When the calcaneal plate 300 is excessively bent, the diameters of the valleys 142 and the peaks 144 of the first female thread 140 are changed so that the locking screw 400 cannot be fastened or cannot be fastened inclinedly. .

FIG. 17 illustrates a state in which the locking screw 400 is inclinedly fastened at a predetermined angle θ ₇ to the locking hole 130 of the calcaneal plate 300. A portion of the first peak 414-1 of the first male thread 410 is inserted into the first valley 142-1 of the first female thread 140. At this time, a portion of the first peak 414-1 comes into contact with the middle portion 136 of the locking hole 130.

18 illustrates a state in which the non-locking screw 400 is inserted into the locking hole 130 of the calcaneal plate 300. The non-locking screw 400 is not threaded in the head 402. When the shaft 404 of the non-locking screw 400 is coupled to the bone, the inclined surface 404 of the head 402 is in contact with the middle portion 136 of the locking hole 130 to maintain the inserted direction. That is, when the intermediate portion 136 is formed in the locking hole 130 of the calcaneal plate 300 and the second female screw 150 is processed, the locking screw 400 and the non-locking screw 400 may be selectively selected as necessary. Can be used.

The embodiments described above are merely illustrative of the preferred embodiments of the present invention, the scope of the present invention is not limited to the described embodiments, those skilled in the art within the spirit and claims of the present invention Various changes, modifications, or substitutions may be made by the present invention, and such embodiments should be understood as falling within the scope of the present invention.

Claims (17)

A first plate segment disposed along the transverse direction; A second plate segment extending upward from a rear end of the first plate segment in a longitudinal direction intersecting the transverse direction; A third plate segment extending in a diagonal direction between the first plate segment and the second plate segment from a portion where the first plate segment and the second plate segment meet; A fourth plate segment extending from the end of the third plate segment toward the front end of the first plate segment, A calcaneal plate formed in each of the first to fourth plate segments and including at least one locking hole in which female threads are formed. The method of claim 1, The angle of the diagonal with respect to the longitudinal direction is 40 °, the angle of the fourth plate segment with respect to the third plate segment is 100 ° calcane plate. The method of claim 1, A calcaneal plate in which each of the first to fourth plate segments is formed with at least one pressing hole for fastening the non-locking screw and at least one small hole for fixing the K wire. The method of claim 1, A calcaneal plate having a plurality of concave surfaces formed on an outer surface of the fourth plate segment to support the bone screw coupled to the calcaneal. The method according to any one of claims 1 to 4, The at least one locking hole has a hole penetrating the upper surface and the lower surface of the calcaneal plate, the hole has a tapered upper portion and a non-tapered lower portion, wherein the first female screw is the lower portion Calcaneus plate formed on the inner circumferential surface of the part. The method of claim 5, The hole further comprises a middle portion tapered in the shape of a truncated cone between the upper portion and the lower portion, wherein the second female screw is further formed in the middle portion. The method according to any one of claims 1 to 4, The fourth plate segment is connected to the front end of the first plate segment, and the adjoining boundary of the first plate segment, the third plate segment and the fourth plate segment is defined by a window bet. The method of claim 7, wherein A calcaneal plate in which the ear, which has a locking hole formed upwardly from the front end of the first plate, extends obliquely. A first plate segment disposed along a transverse direction, a second plate segment extending upward from a rear end of the first plate segment in a longitudinal direction intersecting the transverse direction, and the first plate segment; A third plate segment extending along a diagonal direction between the first plate segment and the second plate segment from a portion where the second plate segment meets, and a front of the first plate segment from an end of the third plate segment A calcaneal plate having a fourth plate segment extending toward the end and at least one locking hole formed in each of the first to fourth plate segments and having a first female thread formed therein; A head tapered to reduce the diameter along a central axis by being fastened to the at least one locking hole, a shaft extending from the head, and a first male screw formed on the head to be fastened to the first female screw; And a locking screw having a second male thread formed on the shaft to be coupled to the bone, When the first male screw is fastened to the first female screw, the depth of the bone having the largest outer diameter among the bones of the first male screw is such that the locking screw can be fastened inclined with respect to the central axis of the at least one locking hole. A calcaneal plate system formed larger than the height of the mountains of the first female thread. The method of claim 9, The head is tapered plate system in the form of a multi-stage inverse truncated cone. The method of claim 9, The at least one locking hole has a hole penetrating the upper surface and the lower surface of the calcaneal plate, the hole has a tapered upper portion and a non-tapered lower portion, wherein the first female screw is the lower portion Calcaneal plate system formed on the inner peripheral surface of the part. The method of claim 11, The hole further comprises a middle portion tapered in the form of a truncated cone between the upper portion and the lower portion, wherein the second female thread is further formed in the middle portion. The method according to any one of claims 9 to 12, The bone plate system of the first female thread is substantially the same as the maximum outer diameter of the first male thread, the inner diameter of the first female thread is formed larger than the minimum outer diameter of the first male thread. The method of claim 13, The lower surface of the calcaneal plate is a calcaneal plate system is formed in a concave curved shape for close contact with the calcaneal. The method according to any one of claims 9 to 12, A calcaneal plate system in which each of the first to fourth plate segments has at least one or more pressing holes for fastening the at least one small hole and the non-locking screw to secure the K wire. The method according to any one of claims 9 to 12, A calcaneal plate system having a plurality of concave surfaces formed on an outer surface of the fourth plate segment to support the bone screw coupled to the calcaneal. The method according to any one of claims 9 to 12, The fourth plate segment is connected to the front end of the first plate segment, and the adjoining boundary of the first plate segment, the third plate segment and the fourth plate segment is defined by a window bet. .

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