CN211583441U - Magnesium alloy fixing screw for cancellous bone - Google Patents
Magnesium alloy fixing screw for cancellous bone Download PDFInfo
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- CN211583441U CN211583441U CN201922057656.8U CN201922057656U CN211583441U CN 211583441 U CN211583441 U CN 211583441U CN 201922057656 U CN201922057656 U CN 201922057656U CN 211583441 U CN211583441 U CN 211583441U
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Abstract
The embodiment of the utility model provides a magnesium alloy set screw for cancellous bone, this a magnesium alloy set screw for cancellous bone includes the nail pole to and with nail pole integrated into one piece's pin fin, be equipped with first screw thread on the nail pole, the length of first screw thread is the same with the length of nail pole, the degree of depth of first screw thread is 30 ~ 45% of nail pole diameter, belong to the degree of depth screw thread, can make the magnesium alloy screw fully pressurize when implanting different grade type bone tissue, be favorable to the thorough of fracture position to reset and heal up fast. The embodiment of the utility model provides a preparation technology operating procedure is simple, and processing low cost, batch production are convenient.
Description
Technical Field
The utility model belongs to the technical field of orthopedics apparatus, concretely relates to magnesium alloy set screw for cancellous bone.
Background
The currently clinically used bone internal fixation screw is mainly made of inert metal materials such as stainless steel, titanium alloy, cobalt-chromium alloy and the like, and although the inert metal materials have good strength and plasticity and are easy to process and form, the inert metal materials are not degradable after being implanted into a body, and can generate problems such as mechanical friction injury, toxic ion precipitation, local inflammatory reaction, stress shielding effect and the like in the long-term service process, thereby seriously affecting the healing of bone tissues, causing osteoporosis and even causing the risk of secondary fracture.
In view of the above, researchers have developed magnesium alloy set screws with the following significant advantages: (1) good biological safety. Magnesium is an essential nutrient element for human bodies, not only can be used as an important activator of various enzymes in cell metabolic activities, but also participates in various complex physiological activities such as protein synthesis, cell energy storage, nerve signal conduction and the like in human bodies; (2) good mechanical compatibility. The density and the elastic modulus of the magnesium alloy screw are closest to those of human bones, so that the stress shielding effect and the osteoporosis caused by the stress shielding effect can be effectively avoided; (3) good biodegradability and absorbability. The magnesium alloy screw is easy to corrode and degrade in the internal environment and can be completely absorbed by the human body, so that the physiological pain and the economic burden of a patient caused by taking out the magnesium alloy screw in a secondary operation are avoided; (4) good osteoblast inducibility. In recent years, a large number of research results show that magnesium ions released by the magnesium alloy screw in the degradation process can induce osteogenic differentiation and proliferation of stem cells in periosteum, can accelerate the healing of fracture parts, and is an ideal bone tissue repair device.
However, the conventional magnesium alloy fixing screw is a standard screw, as shown in fig. 1 or fig. 2. In fig. 1 and 2, 3 is a standard nail cap and 5 is bone tissue. The head of the standard screw in fig. 1 is of a flat head design, without angular inclination, and the sides of the head are not threaded, so that the fixation to the bone tissue is only achieved by means of the threads. The head of the standard screw in fig. 2 is of round head design, without angular inclination, and the side of the head cannot be provided with threads, so that the fixation with the bone tissue is only achieved by the threads. The design of the standard screw often causes the problems of low fastening strength, insufficient pressurizing effect, easy thread slipping and twisting of the screw in clinical application. These problems not only add additional difficulty to the surgical operator, but also affect the post-operative recovery, thus requiring great care throughout the surgical procedure. The above situation also hinders the clinical application of the magnesium alloy set screw.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a magnesium alloy set screw for cancellous bone, this screw have higher fastening strength, abundant pressurization effect and better mechanical properties, can improve the common fastening strength of present magnesium alloy screw lower, the pressurization effect is not enough and the problem of easy smooth silk twist-off by a wide margin.
A magnesium alloy set screw for cancellous bone according to an embodiment of the first aspect of the present invention includes
A nail rod; and
a nail head integrally formed with the nail stem;
the screw rod is provided with a first thread, the length of the first thread is the same as that of the screw rod, and the depth of the first thread is 30-45% of the diameter of the screw rod;
the top of the nail head is provided with a hole-shaped groove, the side face of the nail head is provided with a second thread, the length of the second thread is 50% of the length of the nail head, and the depth of the second thread is 10-20% of the diameter of the nail head.
The embodiment of the utility model provides an among the magnesium alloy set screw for cancellous bone, be equipped with the pass recess at the top of pin fin, can make the magnesium alloy screw when implanting softer sclerotin such as cancellous bone tissue, effectively avoid the smooth silk twist-off of screw and improve the mechanical properties of magnesium alloy screw.
The embodiment of the utility model provides an among the magnesium alloy set screw for cancellous bone, be equipped with the second screw thread in the side of pin fin, the second screw thread is from the lock thread, can make the magnesium alloy screw when implanting softer sclerotin such as cancellous bone tissue, effectively avoids not hard up of screw to rock and improves the fixed strength of magnesium alloy screw.
The embodiment of the utility model provides an among the magnesium alloy set screw for cancellous bone, be equipped with first screw thread on the nail pole, the degree of depth of first screw thread is 30 ~ 45% of nail pole diameter, belongs to the degree of depth screw thread, can make the magnesium alloy screw fully pressurize when implanting different grade type bone tissue, is favorable to the thorough of fracture position to reset and heal up fast. The shallow thread is relative to the deep thread, and the shallow thread generally means that the vertical distance between the front end of the thread and the nail shank is 5-10% of the diameter of the nail body. The shallow thread and the deep thread are compared, the application range of the shallow thread and the deep thread is different, the screw with the shallow thread is generally suitable for being implanted into fracture parts of harder sclerotin such as cortical bone, and the screw with the deep thread is generally suitable for being implanted into fracture parts of softer sclerotin such as cancellous bone.
The embodiment of the utility model provides an among the magnesium alloy set screw for cancellous bone, the magnesium alloy screw has good biosafety, mechanical compatibility, biodegradable absorptivity and osteoblast inductivity, is favorable to reducing the inflammatory reaction at fracture position for the tissue healing at fracture position satisfies the operation requirement to the magnesium alloy screw clinically.
According to some embodiments of the present invention, the shape of the nail head is spherical, and the design of the spherical nail head can make the nail head part have higher fastening strength. The radian of the nail head part of the spherical finger is 0.5-1.0 pi.
According to some embodiments of the invention, the angle between the side of the stud and the centre line of the shank is 20-40 °.
According to some embodiments of the invention, the profile of the second thread is triangular.
The tooth shape is triangular, so that the nail head part has a better fixing effect.
According to some embodiments of the invention, the pass groove comprises a cross groove, a square groove, a pentagonal groove and a hexagonal groove.
The hole-shaped groove can enable the nail head part to have better mechanical property.
According to the utility model discloses a preparation technology of magnesium alloy set screw for cancellous bone of second aspect embodiment, the preparation technology step includes:
s1: after vacuum melting, the magnesium alloy raw material is cast and molded to obtain a magnesium alloy ingot;
s2: after the magnesium alloy ingot is subjected to solution treatment, turning and skinning to obtain a magnesium alloy round ingot;
s3: preheating the magnesium alloy round ingot, and performing plastic extrusion to obtain a magnesium alloy rod;
s4: and annealing the magnesium alloy rod, and then precisely processing to obtain the magnesium alloy fixing screw for the cancellous bone.
According to the utility model discloses a preparation technology for magnesium alloy set screw of cancellous bone has following technological effect at least:
in the preparation process, the magnesium alloy screws with various specifications can be prepared by adopting conventional equipment such as vacuum melting, solution treatment, plastic extrusion, precision machining and the like, and the preparation process has the advantages of simple operation steps, low machining cost and convenient and fast batch production.
According to some embodiments of the invention, the temperature of the vacuum melting is 700-760 ℃.
Stirring is carried out while vacuum melting is carried out, and the stirring time is 1-2 h. And after the vacuum melting is finished, obtaining a magnesium alloy ingot with the diameter phi of 40-80 mm through casting molding.
According to some embodiments of the utility model, the temperature of solution treatment is 400 ~ 500 ℃, the heat preservation time of solution treatment is 6 ~ 8 h.
And after the solid solution treatment is finished, turning and skinning to obtain a magnesium alloy round ingot with the diameter phi of 30-60 mm.
According to some embodiments of the utility model, the temperature of preheating is 300 ~ 350 ℃, the heat preservation time of preheating is 2 ~ 3 h.
After the preheating treatment is finished, a magnesium alloy bar with the diameter of phi 6-12 mm is obtained through plastic extrusion.
According to some embodiments of the utility model, the temperature of annealing is 200 ~ 400 ℃, the heat preservation time of annealing is 1 ~ 2 h.
And after the annealing treatment is finished, performing precision machining to obtain the magnesium alloy screw with the diameter of phi 2-4 mm.
The magnesium alloy raw material used in the preparation process comprises any one of magnesium-zinc alloy, magnesium-calcium alloy, magnesium-strontium alloy, magnesium-manganese alloy, magnesium-silver alloy, magnesium-tin alloy, magnesium-copper alloy, magnesium-lithium alloy, magnesium-zirconium alloy, magnesium-neodymium alloy, magnesium-yttrium alloy and magnesium-gadolinium alloy.
Drawings
Fig. 1 is a schematic view of a standard screw of the prior art with a flat head design.
Fig. 2 is a schematic view of a standard prior art screw with a round head design.
Fig. 3 is a schematic thread depth view of a magnesium alloy set screw for cancellous bone.
Fig. 4 is a structural view of a magnesium alloy set screw for cancellous bone.
Fig. 5 is a side view of a magnesium alloy set screw for cancellous bone.
Fig. 6 is a schematic view of a hole-type groove of a magnesium alloy set screw for cancellous bone.
FIG. 7 is a partial view of a first thread on a shank of a magnesium alloy set screw for cancellous bone.
Fig. 8 is a flow chart of a process for preparing a magnesium alloy set screw for cancellous bone.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the embodiments, but the present invention is not limited to these embodiments.
In order to facilitate accurate understanding of the "depth of the thread" referred to in the embodiments of the present invention, reference will now be made to the drawings. The depth H of the thread refers to the distance as shown in fig. 3.
Example 1
This example provides a magnesium alloy set screw for cancellous bone, as shown in FIGS. 4 and 5, comprising
A nail rod 2; and
a nail head 1 integrally formed with the nail rod 2;
the nail rod 2 is provided with a first thread 5, the length of the first thread 5 is the same as that of the nail rod 2, and the depth of the first thread 5 is 30-45% of the diameter of the nail rod 2;
the top of the nail head 1 is provided with a hole-shaped groove 3, the side surface of the nail head 1 is provided with a second thread 4, the length of the second thread 4 is 50% of the length of the nail head 1, and the depth of the second thread 4 is 10-20% of the diameter of the nail head 1.
The top of the nail head 1 is provided with the hole-shaped groove 3, so that when the magnesium alloy screw is implanted into softer sclerotin such as cancellous bone tissues and the like, the sliding wire of the screw is effectively prevented from being twisted off, and the mechanical property of the magnesium alloy screw is improved. The side of the nail head 1 is provided with the second thread 4, the second thread 4 is a self-locking thread, so that when the magnesium alloy screw is implanted into softer sclerotin such as cancellous bone tissues, loosening and shaking of the screw can be effectively avoided, and the fixing strength of the magnesium alloy screw is improved. The head 1 is spherical in shape and the design of the spherical head 1 allows the head 1 to be partially fastened with a high degree of strength. The included angle between the side surface of the nail head 1 and the center line of the nail rod 2 is 20-40 degrees. The second thread 4 has a triangular profile, which enables the stud 1 to be fixed in a better manner. The tooth shape is triangular, so that the nail head part has a better fixing effect.
As shown in FIG. 6, the hole-type grooves 3 comprise cross-shaped grooves 31, square grooves 32, pentagonal grooves 33 and hexagonal grooves 34, and the hole-type grooves 3 can enable the nail head 1 part to have better mechanical properties.
As shown in figure 7, the first thread 5 is arranged on the nail rod 2, the depth of the first thread 5 is 30-45% of the diameter of the nail rod 2, and the first thread belongs to deep threads, so that the magnesium alloy screw can be fully pressurized when being implanted into different types of bone tissues, and the complete reduction and the rapid healing of the fracture part are facilitated. The shallow thread is relative to the deep thread, and the shallow thread generally means that the vertical distance between the front end of the thread and the nail shank is 5-10% of the diameter of the nail body. The shallow thread and the deep thread are compared, the application range of the shallow thread and the deep thread is different, the screw with the shallow thread is generally suitable for being implanted into fracture parts of harder sclerotin such as cortical bone, and the screw with the deep thread is generally suitable for being implanted into fracture parts of softer sclerotin such as cancellous bone.
Example 2
The embodiment provides a preparation process of a magnesium alloy fixing screw for cancellous bone, the preparation process flow is shown in fig. 8, and the steps include:
s1: after vacuum melting of a magnesium alloy raw material 6, casting and forming to obtain a magnesium alloy ingot 7;
s2: after the magnesium alloy ingot 7 is subjected to solution treatment, turning and skinning are carried out to obtain a magnesium alloy round ingot 8;
s3: preheating the magnesium alloy round ingot 8, and performing plastic extrusion to obtain a magnesium alloy rod 9;
s4: after the magnesium alloy rod 9 is annealed, the magnesium alloy fixing screw 10 for the cancellous bone is obtained through precision machining.
Wherein the temperature of vacuum melting is 700-760 ℃. Stirring is carried out while vacuum melting is carried out, and the stirring time is 1-2 h. And after the vacuum melting is finished, obtaining a magnesium alloy ingot 7 with the diameter phi of 40-80 mm through casting molding.
The temperature of the solution treatment is 400-500 ℃, and the heat preservation time of the solution treatment is 6-8 h. And after the solution treatment is finished, turning and skinning to obtain a magnesium alloy round ingot 8 with the diameter phi of 30-60 mm.
The temperature of the preheating treatment is 300-350 ℃, and the heat preservation time of the preheating treatment is 2-3 h. After the preheating treatment is finished, a magnesium alloy rod 9 with the diameter of phi 6-12 mm is obtained through plastic extrusion.
The temperature of the annealing treatment is 200-400 ℃, and the heat preservation time of the annealing treatment is 1-2 h. And after the annealing treatment is finished, the magnesium alloy screw 10 with the diameter of phi 2-4 mm is obtained through precision machining.
The magnesium alloy raw material 6 used in the above preparation process includes any one of magnesium-zinc alloy, magnesium-calcium alloy, magnesium-strontium alloy, magnesium-manganese alloy, magnesium-silver alloy, magnesium-tin alloy, magnesium-copper alloy, magnesium-lithium alloy, magnesium-zirconium alloy, magnesium-neodymium alloy, magnesium-yttrium alloy, and magnesium-gadolinium alloy.
The above description has been made of specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (5)
1. A magnesium alloy set screw for cancellous bone, comprising
A nail rod (2); and
a nail head (1) integrally formed with the nail rod (2);
a first thread (5) is arranged on the nail rod (2), the length of the first thread (5) is the same as that of the nail rod (2), and the depth of the first thread (5) is 30-45% of the diameter of the nail rod (2);
the top of the nail head (1) is provided with a hole-shaped groove (3), the side face of the nail head (1) is provided with a second thread (4), the length of the second thread (4) is 50% of the length of the nail head (1), and the depth of the second thread (4) is 10-20% of the diameter of the nail head (1).
2. A magnesium alloy fixation screw for cancellous bone according to claim 1, characterized in that said head (1) is spherical in shape.
3. The magnesium alloy fixation screw for cancellous bone according to claim 1, wherein the angle between the side of the head (1) and the centerline of the shank (2) is 20 to 40 °.
4. A magnesium alloy fixation screw for cancellous bone according to claim 1, characterized in that the profile of the second thread (4) is triangular.
5. The magnesium alloy fixation screw for cancellous bone according to claim 1, wherein the hole-type recesses (3) comprise a cross-shaped recess (31), a square-shaped recess (32), a pentagonal recess (33), and a hexagonal-shaped recess (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922057656.8U CN211583441U (en) | 2019-11-25 | 2019-11-25 | Magnesium alloy fixing screw for cancellous bone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922057656.8U CN211583441U (en) | 2019-11-25 | 2019-11-25 | Magnesium alloy fixing screw for cancellous bone |
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| Publication Number | Publication Date |
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| CN211583441U true CN211583441U (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922057656.8U Active CN211583441U (en) | 2019-11-25 | 2019-11-25 | Magnesium alloy fixing screw for cancellous bone |
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- 2019-11-25 CN CN201922057656.8U patent/CN211583441U/en active Active
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