Push-type unilateral cortical bone fixation anchor

Abstract

The present invention relates to a push-type unilateral cortical bone fixation anchor that is fixed to cortical bone by a push type and is configured to minimize damage to the body. A push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention may be configured to include an anchor sleeve having a header portion at a lower end thereof that is inserted into cortical bone and expanded by an external force to be fixed to the cortical bone, and an anchor pin that is inserted into the anchor sleeve and configured to generate an external force that expands the header portion when pushed.

Description

[Technical Field]

[0001] The present invention relates to a unilateral cortical bone fixation anchor that is inserted into and fixed in unilateral cortical bone, and more particularly to a push-type unilateral cortical bone fixation anchor that is fixed to cortical bone by a push type and is configured to minimize damage to the body. [Background technology]

[0002] Typically, in cases such as spinal surgery or fracture treatment, a fixation device is inserted into the bone and fixed depending on the method of the surgery or treatment. Examples of such fixation devices include a "Bone Fixation Device" disclosed in Korean Patent No. 10-1178488 and a "Four-Threaded Pedicle Screw" disclosed in Korean Patent No. 10-1813525.

[0003] However, the above-mentioned bone fixation devices have screw threads on their outer surface for fixation, and are fixed to the bone by rotating them via the screw threads. However, this rotational fixation method using screw threads has the problem of damaging the patient's body, such as surrounding nerves and soft tissues, and generating heat in the surrounding area during the process of inserting / removing the device from the bone, which increases the operation and treatment time. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been proposed to solve the above-mentioned problems, and its purpose is to provide a unilateral cortical bone fixation anchor that is formed into an anchor fixation structure to prevent damage to the patient's body and heat generation during fixation of the cortical bone, thereby shortening the procedure and treatment time while making it easy to implant, remove, and correct. [Means for solving the problem]

[0005] In order to solve the above-mentioned problems, a push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention may be configured to include an anchor sleeve having a header portion at a lower end thereof that is inserted into cortical bone and expanded by an external force to be fixed to the cortical bone, and an anchor pin that is inserted into the anchor sleeve and configured to generate an external force that expands the header portion when pushed.

[0006] Here, the header portion of the anchor sleeve is configured such that the header body is equally divided into a plurality of parts by a plurality of incisions and is expanded and deformed by an external force, and the anchor sleeve hollow portion provided inside the anchor sleeve for inserting the anchor pin may be formed to be narrower than the anchor pin at the lower end side of the header portion and configured to expand when the pin header of the anchor pin is inserted.

[0007] Further, each of the plurality of cutouts may have an expansion range enlargement opening formed at a longitudinal end thereof for enlarging the expansion range of the header portion.

[0008] Furthermore, the hollow portion of the anchor sleeve may have an inclined surface on its side so that the lower side of the header portion has a diameter that is wide at the top and narrow at the bottom, and the pin header may have an inclined surface on its side so that the diameter is wide at the top and narrow at the bottom, but the inclined surface on its side may have an inclined surface that forms an angle of inclination that is smaller than the inclination angle of the inclined surface of the hollow portion of the anchor sleeve based on a vertical line, so that the inclined surface of the pin header may move along the inclined surface of the hollow portion of the anchor sleeve and widen the header portion.

[0009] Furthermore, the expansion range of the header section may be adjusted by varying the difference between the inclination angle of the inclined surface of the hollow portion of the anchor sleeve and the inclination angle of the inclined surface of the pin header, or by adjusting the length of the anchor pin or header section.

[0010] Furthermore, the header portion may be configured to be freely detachable from and attachable to the anchor sleeve, making it replaceable and usable.

[0011] Furthermore, the push-type unilateral cortical bone fixation anchor may further include a first instrument fastening portion provided at an upper end of the anchor sleeve and arranged to be fixed to a body portion of a dedicated applicator, and a second instrument fastening portion provided at an upper end of the anchor pin and arranged to be fixed to a handle portion configured to rotate inside the body portion of the dedicated applicator, wherein the anchor sleeve and anchor pin are connected to each other by a screw thread, and the push of the anchor pin may be adjusted by rotating the handle portion of the dedicated applicator whose body portion is fixed to the first instrument fastening portion.

[0012] On the other hand, the push-type unilateral cortical bone fixation anchor may further include a buffer member disposed on the outer peripheral surface of the header portion and at the lower end of the anchor sleeve to buffer between the anchor sleeve and the cortical bone.

[0013] The header portion may have friction pattern protrusions on its outer surface in one or more of a vertical-horizontal grid pattern, a diagonal grid pattern, a dot pattern, and a mixed wavy-linear pattern.

[0014] Furthermore, the push-type unilateral cortical bone fixation anchor may be configured such that a belt fitting groove is formed across the anchor sleeve and the push nut, forming a length along the circumference, and a fixing belt is fitted into the belt fitting groove and then tied together to fix the anchor sleeve and the push nut with the fixing belt. [Effects of the Invention]

[0015] Compared to conventional methods that use thread rotation to fix the anchor to the cortical bone, the push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention does not use thread rotation, which prevents heat generation, minimizes physical damage, reduces surgical risks, and is beneficial to patient repair.

[0016] Furthermore, because the structure is fixed to one side of the cortical bone, rotational distortion can be corrected even after the metal nail is inserted into the medullary cavity, allowing for accurate correction.Furthermore, the range of instruments that can be connected and used is wider.

[0017] On the other hand, the effects of the push-type unilateral cortical bone fixation anchor according to the embodiments of the present invention mentioned above are not limited to the contents of the description, and may further include any effects that can be predicted from the specification and drawings. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view of a push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the push-type unilateral cortical bone fixation anchor of FIG. 1. [Figure 3a] 2A to 2C are enlarged exemplary views showing various shapes of the header portion of the push-type unilateral cortical bone fixation anchor of FIG. 1. [Figure 3b] 2A to 2C are enlarged exemplary views showing various shapes of the header portion of the push-type unilateral cortical bone fixation anchor of FIG. 1. [Figure 3c] 2A to 2C are enlarged exemplary views showing various shapes of the header portion of the push-type unilateral cortical bone fixation anchor of FIG. 1. [Figure 4a] 4A to 4C are diagrams showing examples of various shapes of the extended range expansion opening of FIG. 3. [Figure 4b] 4A to 4C are diagrams showing examples of various shapes of the extended range expansion opening of FIG. 3. [Figure 5a] 2 is a diagram illustrating an example of use of the push-type unilateral cortical bone fixation anchor of FIG. 1. FIG. [Figure 5b]2 is a diagram illustrating an example of use of the push-type unilateral cortical bone fixation anchor of FIG. 1. FIG. [Figure 6a] FIG. 6 is an enlarged view of a portion near the cortical bone in the example of use shown in FIG. 5. [Figure 6b] FIG. 6 is an enlarged view of a portion near the cortical bone in the example of use shown in FIG. 5. [Figure 7] FIG. 1 is a perspective view of a dedicated applicator for a push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention. [Figure 8] FIG. 8 is a cross-sectional view of the dedicated applicator of FIG. 7. [Figure 9] FIG. 8 is a diagram showing a state in which a push-type unilateral cortical bone fixation anchor is attached to the dedicated applicator of FIG. 7. [Figure 10] FIG. 10 is a cross-sectional view of FIG. [Figure 11] 5A and 5B are diagrams illustrating the configuration and operation of a buffer member provided according to an embodiment of the present invention. [Figure 12a] 10A-10C illustrate various examples of friction pattern protrusions provided in accordance with embodiments of the present invention. [Figure 12b] 10A-10C illustrate various examples of friction pattern protrusions provided in accordance with embodiments of the present invention. [Figure 12c] 10A-10C illustrate various examples of friction pattern protrusions provided in accordance with embodiments of the present invention. [Figure 12d] 10A-10C illustrate various examples of friction pattern protrusions provided in accordance with embodiments of the present invention. [Figure 13a] 1A-1C show examples of friction-enhancing threads provided in accordance with embodiments of the present invention. [Figure 13b] 1A-1C show examples of friction-enhancing threads provided in accordance with embodiments of the present invention. [Figure 14] 10A and 10B are diagrams illustrating the configuration and operation of a fixing belt provided according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following description of the present invention based on the accompanying drawings is not limited to a specific embodiment, and various modifications may be made and various embodiments may be included. Furthermore, the content described below should be understood to include all modifications, equivalents, and alternatives included within the spirit and technical scope of the present invention.

[0020] In the following description, terms such as "first" and "second" may be used to describe various components, but the components are not limited by these terms. Terms such as "first" and "second" are used only to distinguish one component from another.

[0021] Like reference numbers used throughout this specification refer to like elements.

[0022] As used herein, the singular includes the plural unless the context clearly dictates otherwise. Furthermore, the terms "comprises," "has," "comprises," and the like used below should be construed as specifying the presence of any feature, number, step, operation, component, part, or combination thereof set forth in the specification, and should not be understood as precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0023] Hereinafter, a push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0024] FIG. 1 is a perspective view of a push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the push-type unilateral cortical bone fixation anchor of FIG. 1, and FIGS. 3a, 3b, and 3c are enlarged illustrative views showing various shapes of the header portion of the push-type unilateral cortical bone fixation anchor of FIG. 1.

[0025] 4a and 4b are diagrams showing examples of various shapes of the expansion range expansion port of FIG. 3, FIGS. 5a and 5b are diagrams showing an example of use of the push-type unilateral cortical bone fixation anchor of FIG. 1, and FIGS. 6a and 6b are diagrams showing an enlarged view of the area near the cortical bone in the example of use diagram of FIG. 5.

[0026] Referring to Figures 1 to 6, the present invention relates to a fixation anchor that is inserted into unilateral cortical bone CB and is suitable for fracture surgery, particularly minimally invasive fracture surgery, and relates to a push-type unilateral cortical bone fixation anchor that includes an anchor sleeve 10 and an anchor pin 20, and is fixed in the cortical bone CB formed on the surface of bone B by inserting and pushing the anchor pin 20 into the anchor sleeve 10.

[0027] Here, the anchor sleeve 10 has a header portion 11 at its lower end, which is inserted into the cortical bone CB and expanded by an external force to be fixed to the cortical bone CB, and the anchor pin 20 may be configured to generate an external force that expands the header portion 11 when pushed while being inserted into the anchor sleeve 10.

[0028] The structure of the present invention as described above can be easily fixed / released, and has the advantage of minimizing damage to the patient's bone compared to conventional structures that are inserted and fixed into the bone using the rotation of a screw thread.

[0029] There are a wide variety of structures for expanding and fixing the header portion 11 of the anchor sleeve 10 inserted into the cortical bone CB using the anchor pin 20, but in the present invention, in order to make it easier and more convenient to use and to further minimize damage to the patient's bone, the header portion 11 may be configured to include a header portion body 11-1 and an incision portion 11-2, and the anchor pin 20 may be configured to include a pin body 21 and a pin header 22.

[0030] Specifically, the header body 11-1 is not particularly limited, but is preferably cylindrical and may be provided at the lower end of the anchor sleeve 10 with a diameter smaller than the diameter of the anchor sleeve 10, and the cutout 11-2 may extend along the surface from the center of the lower end surface of the header body 11-1 toward the upper end surface of the header body 11-1. In this case, a plurality of cutouts 11-2 may be provided, extending in directions symmetrical to one another, so as to divide the header body 11-1 equally into a plurality of sections.

[0031] The pin body 21 of the anchor pin 20 is not particularly limited, but may preferably be formed in a cylindrical shape and configured to be inserted through the anchor sleeve 10. For this purpose, the anchor sleeve 10 may have a hollow portion 12 formed from the upper end to the lower end of the header body 11-1, the hollow portion 12 having a diameter that allows the anchor pin 20 to be inserted therein. In other words, the centers of the multiple cutouts 11-2 may be connected to the hollow portion 12.

[0032] The pin header 22 may be provided at the lower end of the pin body 21. Here, the pin header 22 may have a larger area than the hollow portion 12 of the anchor sleeve 10 located at the lower end side of the header body 11-1. That is, the hollow portion 12 of the anchor sleeve 10 located at the lower end side of the header body 11-1 is formed to be narrower than the pin header 22, and is configured to expand and deform due to resistance when the pin header 22 passes through.

[0033] In this case, the present invention is configured so that the header body 11-1 is divided evenly by the components of the cutout 11-2, thereby reducing its rigidity, and when the pin header 22 is inserted as an external force body, it is more likely to be expanded and deformed due to the reduced rigidity caused by the cutout 11-2.

[0034] As a result, when the pin header 22 is inserted from the top to the bottom of the anchor sleeve 10 using a tool or by hand, the pin header 22 moves downward along the hollow portion 12 of the anchor sleeve 10, and if it is positioned at the lower end of the narrow header body 11-1, the header body 11-1 can be widened. Here, it is preferable that the pin body 21 be formed longer than the anchor sleeve 10 so that the upper end of the pin body 21 can protrude upward from the anchor sleeve 10 even when the pin header 22 is positioned at the lower end of the header body 11-1.

[0035] Meanwhile, each incision 11-2 may have an expansion range enlargement opening 11-3 at its longitudinal end, i.e., at the end located at the upper end. The expansion range enlargement opening 11-3 is configured to further expand the expansion range of the header section 11 formed only by the incision 11-2, and can be formed as a circular opening with a diameter wider than the width of the incision 11-2 as shown in Figures 3a, 3b, and 3c, a circular opening with a relatively small diameter as shown in Figure 4a, or an elongated opening with a length on the side as shown in Figure 4b, thereby expanding the expansion range of the header section 11.

[0036] In addition, the hollow portion 12 located below the header portion 11 in the hollow portion of the anchor sleeve (hereinafter referred to as the "anchor sleeve hollow portion") forms an inclined surface 12a on the side so as to form a diameter that is wide at the top and narrow at the bottom, and the pin header 22 is also configured to form an inclined surface 22a on the side so as to form a diameter that is wide at the top and narrow at the bottom, and the pin header 22 may be configured so as to be inserted into the hollow portion 12 of the anchor sleeve 10 that forms the diameter that is wide at the top and narrow at the bottom when the pin body 21 is pressed.

[0037] Here, the inclination angle β of the inclined surface of the pin header 22 based on the vertical line VL may be formed to be an even smaller inclination angle than the inclination angle α of the inclined surface of the anchor sleeve hollow portion 12, and the inclined surface 22a of the pin header 22 may be configured to expand the header portion 11 while moving along the inclined surface 12a of the anchor sleeve hollow portion 12.

[0038] Using the above principle, the expansion range of the header portion 11 can be adjusted by varying the difference between the inclination angle α of the inclined surface of the anchor sleeve hollow portion 12 and the inclination angle β of the inclined surface of the pin header 22.

[0039] For example, by reducing the difference between the inclination angle α of the inclined surface of the anchor sleeve hollow portion 12 and the inclination angle β of the inclined surface of the pin header 22, the expansion range of the header portion 11 can be further widened, and by increasing the difference between the inclination angle α of the inclined surface of the anchor sleeve hollow portion 12 and the inclination angle β of the inclined surface of the pin header 22, the expansion range of the header portion 11 can be further narrowed.

[0040] Meanwhile, in addition to the difference between the inclination angle α of the inclined surface of the anchor sleeve hollow portion 12 and the inclination angle β of the inclined surface of the pin header 22, in the present invention, the length of the anchor pin 20 or the header portion 11 can also be adjusted to adjust the expansion range of the header portion 11. Here, by adjusting the length of the anchor pin 20 or the header portion 11, it is possible to vary the degree of insertion of the anchor pin 20 with respect to the length of the header portion 11 compared to conditions where all other adjustments to the lengths of the anchor pin 20 and the header portion 11 are the same, and it is possible to adjust the expansion range of the header portion 11.

[0041] The adjustment of the expansion range of the header portion 11 as described above also affects the fixing force to the cortical bone CB, and therefore can be effectively used to set the fixing force to the cortical bone CB.

[0042] On the other hand, although not shown, the header portion 11 may be configured so that it can be freely removed from the anchor sleeve 10 and freely attached to the anchor sleeve, allowing it to be replaced and used, thereby improving hygiene.

[0043] At this time, for the removal and installation of the header portion 11, the header portion body 11-1 and the anchor sleeve 10 may be connected by a screw thread, or an unspecified fixing device or the like may be provided.

[0044] The anchor pin 20 may be configured to be slidably inserted into the anchor sleeve 10 using a tool or by hand, but more preferably, as shown in the figure, the anchor sleeve 10 and the anchor pin 20 may be connected to each other with a screw thread, and the anchor pin 20 may be configured to be rotated and inserted into the anchor sleeve 10. When the anchor pin 20 is configured to be rotated and inserted into the anchor sleeve 10, fine adjustment of the anchor pin 20 and fixing of its position can be easily performed.

[0045] On the other hand, when the anchor pin 20 is configured to be slidably inserted into the anchor sleeve 10, a fixing portion for fixing the position of the anchor pin 20 may be separately provided.

[0046] Additionally, the push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention may further be configured with a first instrument fastening portion 30 and a second instrument fastening portion 35 for ease of fine tuning and adjustment of the anchor pin 20.

[0047] The first tool fastening portion 30 may be arranged in a polygonal shape at the upper end of the anchor sleeve 10, and the second tool fastening portion 35 may be arranged in a polygonal shape at the upper end of the anchor pin 20, i.e., at the portion that is exposed at the upper side of the anchor sleeve 10 when the anchor pin 20 is inserted into the anchor sleeve 10. Here, the polygonal shape may preferably be a hexagonal shape, but is not necessarily limited thereto.

[0048] A dedicated applicator 100 (shown in Figures 7 to 10) for mechanically adjusting the push-type unilateral cortical bone fixation anchor of the present invention may be fixed to the first instrument fastening portion 30 and the second instrument fastening portion 35, which are arranged in a polygonal shape. Specifically, a body portion 101 of the dedicated applicator 100 may be fixed to the first instrument fastening portion 30, and a handle portion 102 of the dedicated applicator 100 may be fixed to the second instrument fastening portion 35.

[0049] FIG. 7 is a perspective view of a dedicated applicator for a push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention, FIG. 8 is a cross-sectional view of the dedicated applicator of FIG. 7, FIG. 9 is a diagram showing the dedicated applicator of FIG. 7 with a push-type unilateral cortical bone fixation anchor attached, and FIG. 10 is a cross-sectional view of FIG. 9.

[0050] Referring to Figures 7 to 10, the dedicated applicator 100 may be configured with a body portion 101 and a handle portion 102, and may further be configured with a grip portion 103 extending from the body portion 101 for ease of operation and gripping.

[0051] Specifically, the body portion 101 may have a sleeve fastening groove 101a formed on the inside of the lower end portion thereof, the shape of which corresponds to the surface of the first instrument fastening portion 30, in order to fix the first instrument fastening portion 30, and the handle portion 102 may have a pin fastening groove 102a formed on the inside of the lower end portion thereof, the shape of which corresponds to the surface of the second instrument fastening portion 35, in order to fix the second instrument fastening portion 35.

[0052] Here, the handle portion 102 may be configured so that its lower end portion, in which the pin fastening groove 102a is formed, is inserted into the inside of the body portion 101 and rotates inside the body portion 101. In this case, a screw thread (not shown) may be formed between the body portion 101 and the handle portion 102, so that the handle portion 102 moves up or down when it rotates inside the body portion 101.

[0053] In addition, when the anchor sleeve 10 and the anchor pin 20 are connected to each other by a screw thread and the anchor pin 20 is configured to be rotated and inserted into the anchor sleeve 10, a rubber bushing (not shown) may be provided between the lower end of the handle portion 102 and the body portion 101, and the handle portion 102 may rotate in place at the upper end of the rubber bushing while only the anchor pin 20 descends.

[0054] That is, the inside of the body portion 101 may be provided with threads or a rubber bushing so that the handle portion 102 rises or falls along with the anchor pin 20, or alternatively, only the anchor pin 20 may be configured to rise or fall.

[0055] On the other hand, the shape of the handle portion 102 is not particularly limited, but may be formed in a "T" shape to make it easy to grip and operate, and the grip portion 103 may be configured to be detachable from the body portion 101.

[0056] As a result, by rotating the handle portion 102 of the dedicated applicator 100, whose body portion 101 is fixed to the anchor sleeve 10, the anchor pin 20 can move upward or downward while rotating along the thread within the anchor sleeve 10, and if the pin header 22 located at the lower end of the anchor pin 20 is positioned below the header portion 11 during the movement, the header portion 11 can be widened. Using this, the practitioner can adjust the anchor pin 20 more precisely and easily.

[0057] The push-type unilateral cortical bone fixation anchor according to an embodiment of the present invention having the above-described configuration, compared to conventional methods that use thread rotation to fix to cortical bone, does not involve thread rotation in the cortical bone, thereby preventing heat generation, minimizing physical damage and reducing surgical risks, and thereby contributing to patient recovery.

[0058] Furthermore, because the structure is fixed to one side of the cortical bone CB, rotational distortion can be corrected even after the metal nail is inserted into the medullary cavity, allowing for accurate correction.Furthermore, the range of instruments that can be connected and used is wider.

[0059] Meanwhile, the push-type unilateral cortical bone fixation anchor according to the embodiment of the present invention may be configured with a buffer member 40, friction pattern protrusions 50, or a fixing belt 60, as shown in FIGS.

[0060] FIG. 11 is a diagram showing the structure and operation of a buffer member provided according to an embodiment of the present invention.

[0061] 11 , the buffer member 40 may be disposed on the outer peripheral surface of the header portion 11 and at the lower end of the anchor sleeve 10. That is, the buffer member 40 may be fitted into the header portion 11 and positioned at the lower end of the anchor sleeve 10. In this case, the buffer member 40 may be made of rubber or silicone and may provide a buffering effect between surfaces. Thus, when performing a procedure using the fixation anchor of the present invention, the buffer member 40 buffers the gap between the anchor sleeve 10 and the cortical bone CB, preventing the anchor sleeve 10 from abrading the cortical bone CB.

[0062] On the other hand, the buffer member 40 may be fitted into a groove (not shown) formed in the header portion 11 to prevent it from being removed from the header portion 11, and by forming an outer surface with the same diameter as the outer surface of the anchor sleeve 10, damage to the cortical bone CB by the lower surface of the anchor sleeve 10 can be minimized.

[0063] 12a, 12b, 12c and 12d show various examples of friction pattern protrusions provided in accordance with embodiments of the present invention.

[0064] 12, the header portion 11 may have friction pattern protrusions 50 formed on its outer surface. Specifically, the friction pattern protrusions 50 may be a vertical-horizontal grid pattern in which vertical lines and horizontal lines are arranged crossing each other to form a pattern, as shown in Fig. 12a, or a diagonal grid pattern in which diagonal lines in different directions are arranged crossing each other to form a pattern, as shown in Fig. 12b.

[0065] The friction pattern protrusions 50 may also be a dot pattern having an arrangement of only dot protrusions, as shown in FIG. 12c, or a mixed wavy-straight pattern in which wavy lines and straight lines are mixed to form a pattern, as shown in FIG. 12d.

[0066] Here, in Figure 12d, the mixture of wavy lines and straight lines is such that the wavy lines form a length from top to bottom and the straight lines are formed horizontally between the wavy lines, but the present invention is not limited to this in any way, and various variations in shape can be given, such as the wavy lines forming a length on the side and the straight lines being formed vertically between the wavy lines.

[0067] The friction pattern protrusions 50 as described above may be used together or may be configured individually, and may be configured to increase the fixing force with the cortical bone CB when the header portion 11 is expanded by the anchor pin 20. In this case, the fixing force may be increased by forming shear forces in various directions depending on the pattern.

[0068] On the other hand, the header portion 11 may have friction-enhancing threads 55 formed on its outer surface, as shown in Figure 13. Figures 13a and 13b are diagrams showing examples of friction-enhancing threads provided according to an embodiment of the present invention.

[0069] 13, the friction-enhancing threads 55 are intended to improve the fixing force when the header portion 11 is expanded, and are differentiated from conventional threads that are rotated and inserted to fix the bone fixation device. As shown in the figure, such friction-enhancing threads 55 are preferably formed only up to the height of a portion of the header portion 11 where the header portion 11 is expanded, but the present invention is not necessarily limited to this, and although not shown, they may be formed over the entire header portion 11.

[0070] FIG. 14 is a diagram showing the structure and operation of a fixing belt provided according to an embodiment of the present invention.

[0071] 14, when the push nut 30 of the present invention is configured, a belt fitting groove 65 may be formed that extends along the circumference and straddles the anchor sleeve 10 and the push nut 30. Also, both ends of the fixing belt 60 may be fastened after the fixing belt 60 is fitted into the belt fitting groove 65. Here, the fixing belt 60 may tighten the belt fitting groove 65 that straddles the anchor sleeve 10 and the push nut 30 when both ends are fastened, or double fastening may be performed in addition to thread fastening between the anchor sleeve 10 and the anchor pin 20.

[0072] As a result, the fixing belt 60 can prevent the push nut 30 from rising up from the anchor sleeve 10 within the belt fitting groove 65 due to resistance from the cortical bone CB, bone B, etc., which not only makes it easier and more accurate to adjust the push nut 30, but also improves the fixing force of the present invention to the cortical bone.

[0073] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, it should be understood by those skilled in the art that the present invention can be embodied in other specific forms without changing the technical concept or essential features of the present invention. Therefore, it should be understood that the above-described embodiments are merely illustrative in all respects and are not limiting. [Explanation of symbols]

[0074] 10 Anchor sleeve 11 Header section 11-1 Header fuselage 11-2 Incision 11-3 Extended Range Expansion Port 12 Hollow part 12a Slope 20 anchor pin 21 pin fuselage 22-pin header 22a Slope 30 First tool fastening part 35 Second tool fastening part 40 Cushioning material 50 friction pattern protrusions 55 Friction-enhancing threads 60 Fixed Belt 65 Belt fitting groove 100 Dedicated Applicator 101 Torso 101a Sleeve fastening groove 102 Handle 102a Pin fastening groove 103 Gripping part VL vertical line CB cortical bone B bone

Claims

1. an anchor sleeve having a header portion at a lower end thereof, which is inserted into the cortical bone and expanded by an external force to be fixed to the cortical bone; an anchor pin configured to be inserted into the anchor sleeve and to generate an external force that spreads the header portion when pressed; Equipped with The header portion of the anchor sleeve is The header body is divided into a plurality of equal parts by a plurality of incisions, and is configured to be expanded and deformed by an external force. the anchor sleeve hollow portion provided inside the anchor sleeve for inserting the anchor pin is formed to be narrower than the anchor pin at the lower end side of the header portion and is configured to widen when the pin header of the anchor pin is inserted, The plurality of incisions include: An expansion range expansion opening for expanding the expansion range of the header section is formed at each end in the longitudinal direction. Push-type unilateral cortical bone fixation anchor.

2. The anchor sleeve hollow portion is A sloped surface is formed on the side of the header portion so that the lower side of the header portion has a diameter that is wider at the top and narrower at the bottom. The pin header is The inclined surface is formed on the side so as to form a diameter that is wider at the top and narrower at the bottom, and the inclined surface is formed on the side so as to form an inclination angle that is smaller than the inclination angle of the inclined surface of the hollow portion of the anchor sleeve based on a vertical line, 2. The push-type unilateral cortical bone fixation anchor according to claim 1, wherein the inclined surface of the pin header moves along the inclined surface of the hollow portion of the anchor sleeve to expand the header portion.

3. 3. The push-type unilateral cortical bone fixation anchor according to claim 2, wherein the expansion range of the header portion is adjustable by varying the difference between the inclination angle of the inclined surface of the hollow portion of the anchor sleeve and the inclination angle of the inclined surface of the pin header, or by adjusting the length of the anchor pin or the header portion.

4. The header section 2. The push-type unilateral cortical bone fixation anchor according to claim 1, characterized in that it is configured to be freely detachable from and attachable to the anchor sleeve, and is replaceable and usable.

5. a first instrument fastening portion provided at an upper end of the anchor sleeve and configured to be fixed to a body portion of a dedicated applicator; a second tool fastening portion provided at an upper end of the anchor pin and arranged to be fixed to a handle portion configured to rotate inside a body portion of the dedicated applicator; Furthermore, 2. The push-type unilateral cortical bone fixation anchor according to claim 1, wherein the anchor sleeve and the anchor pin are connected to each other by a screw thread, and the push of the anchor pin is adjusted by rotating a handle portion of the dedicated applicator having a body portion fixed to the first instrument fastening portion.

6. 2. The push-type unilateral cortical bone fixation anchor according to claim 1, further comprising a buffer member disposed on an outer peripheral surface of the header portion and at a lower end of the anchor sleeve to buffer between the anchor sleeve and the cortical bone.

7. The header section 2. The push-type unilateral cortical bone fixation anchor according to claim 1, characterized in that the outer surface is formed with friction pattern protrusions in one or more of a vertical-horizontal grid pattern, a diagonal grid pattern, a dot pattern, and a mixed wavy-linear pattern.

8. A belt fitting groove is formed on the anchor sleeve and the push nut, the belt fitting groove extending along the circumference of the anchor sleeve and the push nut.

6. The push-type unilateral cortical bone fixation anchor according to claim 5, wherein a fixing belt is fitted into the belt fitting groove and then tied to fix the anchor sleeve and the push nut by the fixing belt.

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