CN213129838U - Femoral head reconstruction rod - Google Patents
Femoral head reconstruction rod Download PDFInfo
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- CN213129838U CN213129838U CN202021335168.5U CN202021335168U CN213129838U CN 213129838 U CN213129838 U CN 213129838U CN 202021335168 U CN202021335168 U CN 202021335168U CN 213129838 U CN213129838 U CN 213129838U
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Abstract
The utility model discloses a femoral head reconstruction rod, relating to the technical field of medical instruments. The femoral head reconstruction rod is used for solving the problem that the existing femoral head reconstruction rod has poor bone ingrowth effect or reduces the mechanical property for enhancing bone ingrowth so as to influence the supporting effect. The femoral head reconstruction rod is integrally formed and prepared by spherical tantalum powder through a powder bed electron beam additive manufacturing technology, and comprises a rod body and a rod tail; the front end of the rod body is spherical, and the rod body sequentially comprises a central pore passage, a reticular inner lining layer and a first porous truss structure from inside to outside; the outer layer of the rod tail is of a second porous truss structure, the top of the rod tail is in contact with the tail end of the rod body, and the diameter of the rod tail is larger than that of the rod body.
Description
Technical Field
The utility model relates to the technical field of medical equipment, more specifically relate to a femoral head reconstruction rod.
Background
The necrosis of femoral head is also called ischemic necrosis of femoral head, and is a progressive pathological process of ischemic necrosis and collapse of femoral head due to various reasons. The disease is better in middle-aged and young people, if the disease is not treated in time in the early necrosis stage, the disease often progresses to the collapse of femoral head necrosis, and the total hip replacement operation has to be carried out. The artificial joint used for total hip replacement has a certain service life, and hip protection treatment is preferred for patients with early femoral head necrosis, particularly young patients. At present, various methods for preventing and treating early femoral head necrosis and preventing femoral head collapse mainly comprise restrictive load bearing, intramedullary decompression, free fibula transplantation, support and fixation of a femoral head necrosis reconstruction rod and the like.
The femoral head necrosis reconstruction rod which is applied in a large scale at present is a porous tantalum rod of Zimmer company in America, and is prepared by adopting a vapor deposition method2Reaction to produce TaCl5Gas, finally with H2Adding TaCl5Reducing and forming a porous tantalum implant on the carbon skeleton, wherein the porous tantalum implant has a bionic bone trabecula structure, the elastic modulus is 3.00GPa, and the porosity is 70-80%. However, the porous tantalum rod has no osteogenesis inducing activity and average osteogenesis inducing activityThe bone ingrowth degree is only 1.9%, the scattered bone ingrowth is only limited to the periphery of the rod body, and the depth is less than 2 mm; secondly, the investment is large and the preparation process is complex.
With the development of 3D printing technology, it becomes relatively easy to directly prepare porous metal materials matched with the elasticity modulus of human bones, a hollow porous titanium femoral head support rod with gradually changed aperture and porosity is designed domestically, the support rod is provided with a cylindrical central hole, artificial bones or other osteoinductive active drugs can be injected through the central hole, the porous part of the support rod has the aperture and the porosity gradually changed along a long axis, the injected artificial bones or osteoinductive active drugs are mainly distributed at the top end part of the support rod with larger aperture and the periphery of the support rod, the small-aperture low-porosity structure of the rod tail can ensure the mechanical strength, and the stable transition from the porous part to the solid part of the rod tail can be realized. However, the support rod has larger top aperture, which is beneficial to the distribution of injected artificial bone or osteoinductive active drug, but loses mechanical strength to a certain extent and affects the support effect; furthermore, Ti6Al4V is often used as the titanium alloy implanted into the support rod, and there is a risk that the toxic element V may leak out in vivo.
In conclusion, the existing metal femoral rod has the problems of poor bone ingrowth effect or reduced mechanical property for enhancing bone ingrowth so as to influence the supporting effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a femoral head reconstruction rod for there is the bone to grow into the effect poor or for reinforcing bone to grow into and reduce mechanical properties and then influence the problem of supporting effect in solving current femoral head reconstruction rod.
The embodiment of the invention provides a femoral head reconstruction rod, which is integrally formed and prepared by spherical tantalum powder through a powder bed electron beam additive manufacturing technology and comprises a rod body and a rod tail;
the front end of the rod body is spherical, and the rod body sequentially comprises a central pore passage, a reticular inner lining layer and a first porous truss structure from inside to outside;
the rod tail sequentially comprises a hollow structure and a second porous truss structure from inside to outside, the top end of the rod tail is in contact with the tail end of the rod body, and the diameter of the rod tail is larger than that of the rod body.
Preferably, the rod tail is of a hollow structure, and a triangular precession structure is arranged at the bottom of the rod tail;
the depth of the triangular precession structure embedded into the hollow structure is 10-15 mm.
Preferably, the holes of the first cellular truss structure provided on the rod body and the holes of the second cellular truss structure provided on the rod tail are interconnected.
Preferably, the outer diameter of the rod body is phi 8 mm-phi 12mm, and the length of the rod body is 65 mm-135 mm;
the outer diameter of the rod tail is phi 10 mm-phi 14mm, and the length is 30 mm.
Preferably, the diameter of the pore rib of the first porous truss structure is 0.2 mm-0.8 mm, and the pore diameter is 0.5 mm-1 mm.
Preferably, the thickness of the inner wall of the reticular inside lining layer is 0.5 mm-2 mm.
Preferably, the diameter of the hole rib of the reticular inner liner layer is 0.2 mm-0.8 mm, and the hole diameter is 1 mm-1.2 mm.
Preferably, the diameter of the pore rib of the second porous truss structure is 0.2 mm-0.5 mm, and the pore diameter is 0.3 mm-0.5 mm.
The embodiment of the utility model provides a femoral head reconstruction rod, which is integrally molded and prepared by spherical tantalum powder through a powder bed electron beam additive manufacturing technology, and comprises a rod body and a rod tail; the front end of the rod body is spherical, and the rod body sequentially comprises a central pore passage, a reticular inner lining layer and a first porous truss structure from inside to outside; the outer layer of the rod tail is of a second porous truss structure, the top of the rod tail is in contact with the tail end of the rod body, and the diameter of the rod tail is larger than that of the rod body. The thighbone reconstruction rod adopts spherical tantalum powder with low oxygen content as a raw material, and compared with a titanium alloy support rod, the thighbone reconstruction rod fundamentally avoids the problem that harmful elements such as V are separated out in vivo. Moreover, the rod body adopts an inner-outer double-layer composite structure, and the outer layer is of a first porous truss structure, so that the mechanical strength of the support rod can be ensured, and the femoral head necrosis area can be effectively supported; the inner layer mesh lining has thick and thick apertures, which is beneficial to the transmission of body fluid between the implant and human bones and the outward diffusion of osteoinductive active substances, and improves the osteogenesis inducing activity of the support rod under the condition of ensuring the mechanical strength; the central hole of the rod body can be injected with artificial bone or other bone inducing active substances. The embodiment of the utility model provides a central pore and netted inside lining of stick are rebuild to the femoral head facilitate osteoinduction active substance, and the effect is gone into to reinforcing bone growth, and moreover, this femoral head is rebuild the stick and is adopted inside and outside double-deck composite construction, has guaranteed to rebuild the mechanical properties and the support effect of stick.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a femoral head reconstruction rod according to an embodiment of the present invention;
fig. 2 is a schematic bottom structure view of a rod tail according to an embodiment of the present invention;
101-a central pore channel, 102-a reticular lining, 103-a first porous truss structure, 104-a second porous truss structure, 105-a hollow structure and 106-a triangular precession structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural view of a femoral head reconstruction rod according to an embodiment of the present invention, and as shown in fig. 1, the femoral head reconstruction rod mainly includes a rod body and a rod tail.
The femoral head reconstruction rod is integrally formed by spherical tantalum powder through a powder bed electron beam additive manufacturing technology, the front end of the rod body is spherical, and the femoral head reconstruction rod can be conveniently placed in an application environment through the arrangement. As shown in fig. 1, the rod body adopts an inner-outer double-layer composite structure, the outermost layer of the rod body is a first porous truss structure 103, the inner layer of the first porous truss structure 103 is a mesh-shaped lining 102 layer, and the inner layer of the mesh-shaped lining 102 layer is a central pore passage 101, i.e., the mesh-shaped lining 102 layer is in a hollow cylindrical shape. The rod body is arranged through the above arrangement, the mechanical strength of the femoral head reconstruction rod can be ensured by the first porous truss structure 103 positioned on the outer layer, effective support for a femoral head necrosis area can be realized, the reticular lining 102 layer arranged on the outer layer is provided with a large pore size, transmission of body fluid between an implant and a human body bone and outward diffusion of osteoinductive active substances are facilitated, thereby improving the induced osteogenesis activity of the femoral head reconstruction rod under the condition of ensuring the mechanical strength, the center of the femoral head reconstruction rod is arranged to be a central pore passage 101, and artificial bones or other osteoinductive active substances can be injected into the central pore passage 101.
As shown in fig. 1, the femoral reconstruction rod includes a second porous truss structure 104 on the outer layer of the rod tail, and the second porous truss structure 104 is formed in a threaded shape, i.e., the outer layer of the rod tail is the second porous truss structure 104 in a threaded shape. Further, the top end of the rod tail is contacted with the tail end of the rod body, and the diameter of the rod tail is larger than that of the rod body.
In one embodiment, the femoral reconstruction rod includes a rod tail having a hollow structure 105 inside, and a trigonal precession structure 106 disposed in the hollow structure 105, wherein the depth of the trigonal precession structure 106 embedded in the hollow structure 105 may be in a range of 10mm to 15 mm. It should be noted that, in practical applications, the triangular precession structure 106 is fixed at a specific position for surgical precession.
In one embodiment, the holes of first cellular truss structure 103 disposed on the body are interconnected in diameter with the holes of second cellular truss structure 104 disposed on the tail, as the end of the body is in contact with the top end of the tail.
The embodiment of the utility model provides an in, the hole muscle diameter that sets up the first porous truss structure 103 of excellent outer layer is rebuild at the femoral head is 0.2mm ~ 0.8mm, and the aperture is 0.5mm ~ 1mm, through the aforesaid setting, can guarantee to support the mechanical strength of stick, realizes the effective support to femoral head necrosis region.
Furthermore, the thickness of the inner wall of the mesh-shaped lining 102 layer arranged in the first porous truss structure 103 is 0.5 mm-2 mm, the diameter of the pore rib is 0.2 mm-0.8 mm, and the pore diameter is 1 mm-1.2 mm. Through the arrangement, the artificial bone or other bone inducing active substances can be ensured to be injected into the central pore passage 101 formed by the reticular lining 102 layer, and meanwhile, the bone inducing active substances are ensured to be effectively diffused outwards.
Furthermore, the diameter of the hole rib of the second porous truss structure 104 arranged on the outer layer of the rod tail is 0.2 mm-0.5 mm, and the diameter of the hole rib is 0.3 mm-0.5 mm. The rod tail has higher strength, bears the precession force on one hand, and on the other hand is used as a bottom support to bear the force after being finally fixed.
In the embodiment of the utility model, the outer diameter of the bar body is phi 8 mm-phi 12mm, and the length is 65 mm-135 mm; furthermore, the outer diameter of the rod tail is phi 10 mm-phi 14mm, and the length is 30 mm.
To sum up, the embodiment of the utility model provides a femoral head reconstruction rod, its spherical tantalum powder that adopts low oxygen content is the raw materials, compares titanium alloy support rod, and fundamentally has avoided harmful element like the problem that V appears in vivo. Moreover, the rod body adopts an inner-outer double-layer composite structure, and the outer layer is of a first porous truss structure, so that the mechanical strength of the support rod can be ensured, and the femoral head necrosis area can be effectively supported; the inner layer mesh lining has thick and thick apertures, which is beneficial to the transmission of body fluid between the implant and human bones and the outward diffusion of osteoinductive active substances, and improves the osteogenesis inducing activity of the support rod under the condition of ensuring the mechanical strength; the central hole of the rod body can be injected with artificial bone or other bone inducing active substances. The embodiment of the utility model provides a femoral head is rebuild stick can solve current femoral head and rebuild the stick and have the bone to grow into the effect poor or for reinforcing bone length goes into and reduce mechanical properties and then influence the problem of supporting effect.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A femoral head reconstruction rod is characterized in that the femoral head reconstruction rod is integrally formed and prepared by spherical tantalum powder through a powder bed electron beam additive manufacturing technology and comprises a rod body and a rod tail;
the front end of the rod body is spherical, and the rod body sequentially comprises a central pore passage, a reticular inner lining layer and a first porous truss structure from inside to outside;
the rod tail sequentially comprises a hollow structure and a second porous truss structure from inside to outside, the top end of the rod tail is in contact with the tail end of the rod body, and the diameter of the rod tail is larger than that of the rod body.
2. The femoral head reconstruction rod according to claim 1, wherein the rod tail is a hollow structure, and a triangular screw-in structure is arranged at the bottom of the rod tail;
the depth of the triangular precession structure embedded into the hollow structure is 10-15 mm.
3. The femoral head reconstruction rod of claim 1 wherein the apertures of the first multi-aperture truss structure disposed on the rod body are in communication with the apertures of the second multi-aperture truss structure disposed on the rod tail.
4. The femoral head reconstruction rod of claim 1, wherein the rod body has an outer diameter of Φ 8mm to Φ 12mm and a length of 65mm to 135 mm;
the outer diameter of the rod tail is phi 10 mm-phi 14mm, and the length is 30 mm.
5. The femoral head reconstruction rod of claim 1, wherein the first porous truss structure has a pore rib diameter of 0.2mm to 0.8mm and a pore diameter of 0.5mm to 1 mm.
6. The femoral head reconstruction rod of claim 1, wherein the mesh liner layer has an inner wall thickness of 0.5mm to 2 mm.
7. The femoral head reconstruction rod according to claim 1, wherein the mesh-shaped liner layer has a rib diameter of 0.2mm to 0.8mm and a bore diameter of 1mm to 1.2 mm.
8. The femoral head reconstruction rod of claim 1, wherein the second porous truss structure has a pore rib diameter of 0.2mm to 0.5mm and a pore diameter of 0.3mm to 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021335168.5U CN213129838U (en) | 2020-07-09 | 2020-07-09 | Femoral head reconstruction rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021335168.5U CN213129838U (en) | 2020-07-09 | 2020-07-09 | Femoral head reconstruction rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213129838U true CN213129838U (en) | 2021-05-07 |
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ID=75729700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021335168.5U Active CN213129838U (en) | 2020-07-09 | 2020-07-09 | Femoral head reconstruction rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213129838U (en) |
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2020
- 2020-07-09 CN CN202021335168.5U patent/CN213129838U/en active Active
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Address after: Room 303-46, building a, Kairui, Fengcheng 12th Road, Xi'an Economic and Technological Development Zone, Shaanxi 710018 Patentee after: Xi'an Sailong Additive Technology Co.,Ltd. Address before: Room 303-46, building a, Kairui, Fengcheng 12th Road, Xi'an Economic and Technological Development Zone, Shaanxi 710018 Patentee before: XI'AN SAILONG METAL MATERIALS Co.,Ltd. |