Three-dimensionally-printed self-expanding intramedullary fixation implant

Abstract

The objective of the present invention is to provide a three-dimensionally-printed self-expanding intermedullary fixation implant that can be easily inserted into a fractured bone medullary cavity while the implant is in a compressed state with a reduced diameter, can firmly fasten the fractured bone while the compressed implant is radially expanding by means of spring back and, simultaneously, comes into close contact with the inner wall of the medullary cavity, and can be easily separated from the inside of the medullary cavity since the expanded implant returns to being compressed again after the fractured bone is set.

Description

3D-printed self-expanding intramedullary implant

[0001] The present invention relates to a three-dimensionally printed, self-expanding intramedullary nailing implant, and more particularly, to a three-dimensionally printed, self-expanding intramedullary nailing implant that can be easily inserted in a compressed state into the intramedullary nailing of a fractured bone, can firmly fix the fractured bone by expanding by a spring back, and can be easily separated from the intramedullary nailing by being compressed again after the fractured bone is connected.

[0002] As the average human lifespan has increased due to advancements in medicine and the number of elderly people has increased, the number of patients with fractures of the femur and other bones has also increased. In addition, as outdoor activities such as exercise have increased, the number of patients with fractures of the femur and other bones in the arms and legs has also increased.

[0003] For the surgical and treatment of these bone fractures, various types of implant devices are used to directly connect the fracture site.

[0004] The attached drawings 1a and 1b are schematic diagrams illustrating a conventional implant device for bone fracture surgery.

[0005] As shown in Fig. 1a, an implant device according to a conventional example is composed of a metal plate (10) and a pin-shaped fastening screw (12) having a predetermined length.

[0006] Accordingly, fracture treatment can be performed by placing the metal plate (10) in close contact with the fractured femur, and then inserting and fixing a fixing screw (12) from the metal plate (10) toward the fractured femur.

[0007] However, since the above-mentioned multiple fastening screws (12) must be inserted and fastened from the metal plate (10) to the fractured femur, etc., the surgical operation takes a long time, the surgical operability is greatly reduced, and in particular, since the incision and wound area for the surgery are excessively large, there is a problem that the surgery is impossible for the elderly with weak physical strength and recovery speed.

[0008] As shown in Fig. 1b, an implant device according to another conventional example is composed of a metal pin (20) of a predetermined diameter and a fixing screw (22) having a predetermined length.

[0009] Accordingly, fracture treatment can be performed by inserting the metal pin (20) into the fractured femur, and then inserting and fastening a fixing screw (22) from the metal pin (20) toward the fractured femur.

[0010] However, after the metal pin (20) is inserted and fixed into the fractured femur, etc., a fixing screw (22) must be further inserted and fixed to fix the metal pin (20). Therefore, since the insertion directions of the metal pin (20) and the fixing screw (22) are different, the surgical operation takes a long time, the surgical operability is greatly reduced, and likewise, since the incision and wound area for the surgery are excessive, there is a problem that the surgery is impossible for the elderly with weak physical strength and recovery speed.

[0011] The present invention has been made to solve the above-mentioned problems of the related art, and the purpose of the present invention is to provide a three-dimensional printed self-expanding intramedullary nailing implant, which can easily insert an implant in a compressed state with a narrowed diameter into the intramedullary canal of a fractured bone, and can firmly fix the fractured bone by allowing the compressed implant to expand in the radial direction by spring back and adhere to the inner wall of the intramedullary canal, and after the fractured bone is fixed, the expanded implant is made compressed again so that it can be easily separated from the inside of the intramedullary canal.

[0012] In order to achieve the above object, the present invention comprises: an implant body comprising: a rectangular metal plate body rolled into a cylindrical shape, an arcuate plate body having a radial expansion or contraction function, a first curved plate integrally formed at one end of the arcuate plate body body, and a second curved plate integrally formed at the other end of the arcuate plate body body and overlapping an outer surface of the first curved plate, wherein a plurality of first fastening holes and second fastening holes are formed at equal intervals through the first curved plate and the second curved plate respectively along the longitudinal direction; and a fastening string that is sequentially inserted into and passes through the plurality of first fastening holes and second fastening holes in a zigzag manner, one end of which is fixed to one longitudinal end of the implant body, and the other end of which is pullably locked to the other longitudinal end of the implant body. The present invention provides a three-dimensional printed self-expanding intramedullary nailing implant, characterized in that when the tying string is pulled until the first tying hole of the first curved plate and the second tying hole of the second curved plate are aligned with each other, the diameter of the implant body is narrowed and compressed so that it can be inserted into the intramedullary canal of the bone, and when the tying string is released after the implant body is inserted into the intramedullary canal in a compressed state, the compressed implant body expands in the radial direction by a spring back action to fix the fractured bone and at the same time comes into close contact with the inner wall of the intramedullary canal, and when the tying string is pulled again after the fractured bone is connected, the implant body that has expanded in the intramedullary canal is compressed again so that it can be separated from the intramedullary canal.

[0013] In addition, a tying ring is integrally formed on one inner surface of the first curved plate of the implant body so that one end of the tying string is fixed, and a hook that is lockably hooked to the other outer surface of the second curved plate of the implant body is connected to the other end of the tying string.

[0014] In addition, the arc-shaped plate portion of the implant body is characterized by having a structure in which a plurality of spike portions are formed to protrude in the outer diameter direction at equal intervals along the arc direction so as to be in close contact with the inner wall surface of the bone marrow cavity.

[0015] Through the means for solving the above-mentioned problem, the present invention provides the following effects.

[0016] First, surgery to repair bone fractures can be performed easily and simply by simply inserting a radially compressed implant into the medullary canal of the fractured bone.

[0017] That is, by simply pulling the binding string and locking it, the diameter of the cylindrically rolled implant becomes narrower and compressed (shrinks), so that the compressed implant can be easily inserted into the medullary cavity of the fractured bone.

[0018] Second, after the compressed implant is inserted into the intramedullary canal of the fractured bone, the implant expands radially by spring back and the spike portion of the implant is firmly fixed to the inner wall of the intramedullary canal by simply releasing the locking action of the tying string, thereby firmly fixing and securing the fractured bone.

[0019] Third, after the fractured bone is reattached after a certain period of time, the implant, which was inserted into the bone marrow cavity while inflated, is compressed (contracted) again by simply pulling the ligature again to lock it, thereby narrowing its diameter, allowing the implant to be easily separated and removed from the bone marrow cavity.

[0020] Fourth, since the implant can be easily inserted into the bone marrow cavity of the bone fracture area or easily separated from the bone marrow cavity simply by pulling or releasing the tying string, the surgical workability can be improved and the surgical time can be shortened, and in particular, implant surgery can be easily performed on elderly fracture patients with weak physical strength and recovery speed.

[0021] Figures 1a and 1b are schematic diagrams showing a conventional implant device for bone fracture surgery.

[0022] Figure 2 is a perspective view showing a three-dimensionally printed self-expanding intramedullary nailing implant according to the present invention.

[0023] Figure 3 is a cross-sectional view showing a three-dimensionally printed self-expanding intramedullary nailing implant according to the present invention.

[0024] Figure 4 is a cross-sectional view showing a three-dimensionally printed self-expanding intramedullary nailing implant according to the present invention.

[0025] Figure 5 is a cross-sectional view illustrating a process of inserting a three-dimensionally printed self-expanding intramedullary nailing implant according to the present invention into an intramedullary canal.

[0026] Figures 6a and 6b are cross-sectional views illustrating the process of inserting and expanding a three-dimensionally printed self-expanding intramedullary nailing implant according to the present invention into the intramedullary canal.

[0027] Figure 7 is a cross-sectional view illustrating a process of separating a three-dimensionally printed self-expanding intramedullary nailing implant according to the present invention from the inside of the intramedullary nail.

[0028] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0029] The attached drawings 2, 3 and 4 illustrate a three-dimensionally printed self-expanding intramedullary nailing implant according to the present invention, and in each drawing, reference numeral 100 indicates an implant body.

[0030] The present invention focuses on the fact that, during fracture surgery, the implant body (100) can be easily inserted into the intramedullary canal of a fractured bone by making the diameter narrower and then being compressed, and the implant body (100) in the compressed state by the spring back can be expanded in the radial direction and pressed against the inner wall of the intramedullary canal to firmly fix the fractured bone, and after the fractured bone is connected, the expanded implant body (100) is compressed again and can be easily separated from the inside of the intramedullary canal, thereby improving the surgical workability and shortening the surgical time, and making it easy to perform implant surgery on elderly fracture patients with weak physical strength and recovery speed.

[0031] To this end, the implant body (100) is a fracture surgical instrument manufactured in a cylindrical shape by 3D printing using titanium material, in which a rectangular metal plate is rolled into a cylindrical shape. In order to connect fractured bones and hold them in place, and to easily join the fractured bones, the implant body (100) can be manufactured in a cylindrical structure that can be inserted into the medullary cavity of the bone and compressed or expanded in the radial direction.

[0032] More specifically, the implant body (100) may be manufactured in a cylindrical shape as shown in FIGS. 2 to 4, in which a rectangular metal plate is rolled, and may be composed of an arc-shaped plate body part (130) that has a radial expansion or contraction function, a first curved plate (110) integrally formed at one end of the arc-shaped plate body part (110), and a second curved plate (120) integrally formed at the other end of the arc-shaped plate body part (130) and overlapping the outer surface of the first curved plate (110).

[0033] In particular, a plurality of first fastening holes (111) and second fastening holes (121) are formed at equal intervals along the longitudinal direction in the first curved plate (110) and the second curved plate (120) of the implant body (100).

[0034] As a means for compressing or expanding the implant body (100) in the radial direction, a binding line (200) sequentially inserted into the first binding hole (111) and the second binding hole (121) is used.

[0035] One end of the above-mentioned binding line (200) is fixed to one longitudinal end of the implant body (100), and the other end can be pulled and locked to the other longitudinal end of the implant body (100).

[0036] To this end, a tying ring (201) is integrally formed on one inner surface of the first curved plate (110) of the implant body (100) so that one end of the tying string (200) is fixed, and a hook (202) that is lockably hooked to the other outer surface of the second curved plate (120) of the implant body (100) is connected to the other end of the tying string (200).

[0037] More specifically, when the tying line (200) is sequentially inserted in a zigzag pattern through the first tying hole (111) of the first curved plate (110) and the second tying hole (121) of the second curved plate (120), one end of the tying line (200) is fixed by being tied to the tying ring (201) of the first curved plate (110), and a hook (202) that is lockably hooked to the other end of the tying line (200) can be connected to the outer surface of the other side of the second curved plate (120).

[0038] Meanwhile, the circular plate portion (130) of the implant body (100) is provided with a structure in which a plurality of spike portions (131) are formed to protrude in the outer diameter direction at equal intervals along the circular direction so as to adhere to the inner wall surface of the bone marrow cavity.

[0039] Here, the process of performing surgery on a fractured bone using an implant having the above-described configuration is as follows.

[0040] The attached drawings 5, 6a and 6b, and 7 are cross-sectional views illustrating the process of performing and separating a three-dimensionally printed self-expanding bone marrow-attaching implant according to the present invention.

[0041] First, the above-mentioned binding line (200) is pulled to radially compress the implant body (100).

[0042] More specifically, when the other end of the tying string (200) connected to the hook (202) is pulled until the second curved plate (120) overlaps the outer surface of the first curved plate (110) and the first tying hole (111) of the first curved plate (110) and the second tying hole (121) of the second curved plate (120) are aligned with each other, the tying string (200) is tightened to a predetermined tension and the diameter of the implant body (100) is compressed while narrowing.

[0043] As described above, when the diameter of the implant body (100) is narrowed and compressed, the implant body (100) can be easily inserted into the bone marrow cavity.

[0044] At this time, as shown in Fig. 5, by hooking and locking the hook (202) connected to the other end of the tying string (200) to the other outer surface of the second curved plate (120) of the implant body (100), the tying string (200) can be maintained at a predetermined tension while the implant body (100) can be maintained in a compressed state with its diameter narrowed.

[0045] Accordingly, the surgeon can easily insert the implant body (100) compressed as described above, i.e., the implant body (100) compressed to a smaller diameter than the internal space of the bone marrow cavity, into the bone marrow cavity of the fractured bone, as shown in FIG. 5.

[0046] Next, when the surgeon releases the tying line (200), that is, releases the hook (202) connected to the other end of the tying line (200) from the other outer surface of the second curved plate (120) and releases the tying line (200), the implant body (100) in a compressed state expands in the radial direction to fix the fractured bone by the spring back action, and at the same time comes into close contact with the inner wall of the intramedullary cavity, as shown in FIGS. 6a and 6b.

[0047] In particular, a plurality of spike portions (131) formed on the arc-shaped plate portion (130) of the implant body (100) can be pressed against the inner wall surface of the bone marrow cavity to firmly fix and secure the fractured bone.

[0048] In this way, after the implant body (100) is inserted into the bone marrow cavity of the fractured bone in a compressed state, the spike portion (131) of the implant body (100) can be firmly fixed to the fractured bone by expanding due to the spring back.

[0049] In addition, since the skin incision and wound area for the bone fracture site for the implant body (100) procedure can be minimized, the surgical workability can be improved and the surgical time can be shortened, and in particular, implant surgery can be easily performed even on elderly fracture patients with weak physical strength and recovery speed.

[0050] Meanwhile, after the implant body (100) is inserted in an expanded state into the bone marrow cavity of the fractured bone, after a certain period of time, the fractured bone can be joined, and the procedure of removing the implant body (100) again can be easily performed.

[0051] To this end, the above-mentioned binding line (200) is pulled again until the second curved plate (120) overlaps the outer surface of the first curved plate (110) and the first binding hole (111) of the first curved plate (110) and the second binding hole (121) of the second curved plate (120) are aligned with each other.

[0052] Accordingly, as illustrated in FIG. 7, the implant body (100) that was expanded within the bone marrow cavity becomes compressed while becoming narrower than the diameter within the bone marrow cavity, and the compressed implant body (100) can be easily separated and removed from the inside of the bone marrow cavity.

[0053] In this way, by simply pulling or releasing the binding string (200), the implant body (100) can be easily inserted into the bone marrow cavity of the bone fracture area or the implant body (100) can be easily separated from the bone marrow cavity, thereby improving the surgical workability and shortening the surgical time, and in particular, implant surgery can be easily performed even on elderly fracture patients with weak physical strength and recovery speed.

Claims

1. An implant body (100) manufactured in a cylindrical shape with a rectangular metal plate body rolled up, comprising an arc-shaped plate body (130) that has a radial expansion or contraction function, a first curved plate (110) integrally formed at one end of the arc-shaped plate body (110), and a second curved plate (120) integrally formed at the other end of the arc-shaped plate body (130) and overlapping the outer surface of the first curved plate (110), and having a structure in which a plurality of first fastening holes (111) and second fastening holes (121) are formed at equal intervals through the first curved plate (110) and the second curved plate (120) along the longitudinal direction, respectively; and A tying string (200) that is sequentially inserted into and passed through the first tying holes (111) and second tying holes (121) in a zigzag pattern, one end of which is fixed to one longitudinal end of the implant body (100), and the other end of which is pullably locked to the other longitudinal end of the implant body (100); It consists of, including, When the tying string (200) is pulled until the first tying hole (111) of the first curved plate (110) and the second tying hole (121) of the second curved plate (120) are aligned with each other, the diameter of the implant body (100) is compressed and narrowed so that it can be inserted into the bone marrow cavity. When the above implant body (100) is inserted into the bone marrow cavity in a compressed state and the binding string (200) is released, the compressed implant body (100) expands in the radial direction to fix the fractured bone by a spring back action and is pressed against the inner wall of the bone marrow cavity. A three-dimensional printed self-expanding intramedullary implant characterized in that when the ligature (200) is pulled again after the fractured bone is connected, the implant body (100) that has expanded within the intramedullary cavity is compressed again so that it can be separated from the intramedullary cavity.

2. In claim 1, A three-dimensional printed self-expanding intramedullary nailing implant characterized in that a tying ring (201) is integrally formed on one inner surface of a first curved plate (110) of the implant body (100) so that one end of the tying string (200) is fixed, and a hook (202) that is lockably hooked to the other outer surface of a second curved plate (120) of the implant body (100) is connected to the other end of the tying string (200).

3. In claim 1, A three-dimensional printed self-expanding implant for bone marrow connection, characterized in that the circular plate portion (130) of the above implant body (100) is provided with a structure in which a plurality of spike portions (131) are formed to protrude in the outer diameter direction at equal intervals along the arc direction so as to adhere closely to the inner wall surface of the bone marrow cavity.

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