CN203988332U - The pure magnesium screw of a kind of preposition screw thread degradable - Google Patents
The pure magnesium screw of a kind of preposition screw thread degradable Download PDFInfo
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- CN203988332U CN203988332U CN201420475383.3U CN201420475383U CN203988332U CN 203988332 U CN203988332 U CN 203988332U CN 201420475383 U CN201420475383 U CN 201420475383U CN 203988332 U CN203988332 U CN 203988332U
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Abstract
The utility model discloses the pure magnesium screw of a kind of preposition screw thread degradable, relate to medical implant field.The pure magnesium screw of a kind of preposition screw thread degradable of this utility model comprises body and nut, described body is provided with screw thread, described nut is provided with profile counterbore, it is characterized in that: described reach is 0.3-0.5:1 with the ratio of body length, described nut is pressurization nut, and the face that described pressurization nut is connected with body and the angle of body centrage are 22 °-30 °.The pure magnesium screw of the preposition screw thread degradable of this utility model can degrade voluntarily, cheap, there is the high tissue compatibility and biomechanical property, and can induce osseous tissue to generate, can meet the demand of extensive patients.
Description
Technical field
This utility model relates to a kind of medical implant, particularly a kind of medical embedded pure magnesium screw of preposition screw thread degradable that is used for the treatment of femur head necrosis.
Background technology
At present, femoral head articular step-off or femur head necrosis are clinical common diseases.At present the normal mode that adopts boring decompression is treated, and needs to refill to support after sequestrum is removed to subside or downright bad femoral head implant in operation process; In the treatment of middle and advanced stage femur head necrosis, current more employing is shifted treatment with or without the bone lobe of blood vessel, by a large amount of experiments and clinical confirmation, simple bone is transplanted and is existed bone lobe to deviate from, biomechanics underbraced, the shortcomings such as bone resorption, thereby need to have and can provide fixing and promote the bone implant that bone is grown into.
Present stage, common implantation immobilization material mostly was rustless steel, Titanium Alloy Screw etc., and this material has good Biostrength, and bone piece or bone lobe are had to stable fixed effect.But all there is following certain drawback in such implant: 1. in human body, emit toxic metal ion, cause inflammation in receptor body, thereby reduce biocompatibility.2. elastic modelling quantity mostly cannot be near with people's bone photo well, causes stress-shielding effect, thereby reduce the stimulation that freshman bone tissue is grown and reinvented, and finally causes the unstable of implant.3. the medical metal material of current clinical use is non-degradable material, when after implant the completing the term of service in human body, must take out by operation again, will increase patient's misery and medical expense burden.
The pure magnesium screw of preposition screw thread degradable has the advantage that other biological material cannot replace: 1. magnesium elements belongs to one of trace element of needed by human, almost participates in metabolic processes all in human body and also has the effect of induction of bone growth; 2. magnesium alloy has the density and the mechanical performance that approach the most with people's bone, and has the highest specific strength in all metals.The density of magnesium alloy is about 1.7g/cm3, very close with people's bone density (1.75g/cm3 left and right); 3. magnesium and magnesium alloy have good biocompatibility, can automatically degrade in vivo, without the taking-up of again performing the operation; 4. magnesium resource is abundant, cheap, is applicable to a large amount of Development and Production.
Lower about the magnesium alloy purity obtaining under degradable magnesium material normal condition, the production of metal current magnesium mainly adopts ferrosilicon process and electrolysis, in alloy, the content of the impurity element such as Si, Fe and Cl is higher, limit the utilization of magnesium alloy, but along with magnesium alloy is manufactured the improvement of processing conditions and the improvement of process equipment, the high-purity magnesium of current 99.999% above purity has entered the suitability for industrialized production stage.
The existing pure magnesium screw of preposition screw thread degradable being fixed is traditional standard screw, this standard screws is because its screw thread and nut do not carry out special handling, in application, usually there is hold deficiency, nut afterbody is screwed into follow-up pressure deficiency, owing to firmly can not evenly conducting the distortion and the fracture that even occur screw.These deficiencies will cause the extra operation burden of patient, even have influence on the effect of operation, therefore in application, need very prudent.
Utility model content
This utility model is for the existing magnesium screw hold deficiency to propose, follow-up pressure deficiency and be easily out of shape the problem rupturing, and the pure magnesium screw of a kind of preposition screw thread degradable of research design, this screw can degrade voluntarily, cheap, there is the high tissue compatibility and biomechanical property, and can induce osseous tissue to generate.The technological means that this utility model adopts is as follows:
The pure magnesium screw of a kind of preposition screw thread degradable, comprise body and nut, described body is provided with screw thread, described nut is provided with profile counterbore, described reach is 0.3-0.5:1 with the ratio of body length, described nut is tapered cup nut, and the angle of the conical surface of described tapered cup nut and body centrage is 22 °-30 °.
Further, the width of described screw thread is 0.5mm-0.7mm, and the spacing of described screw thread is 0.55mm-0.75mm, the 1/10-1/5 of the diameter that the degree of depth of described screw thread is described body, and lead angle is 5 °-20 °.
Further, the tooth side angle α of described screw thread is 30 °-50 °.
Further, described profile counterbore is in-line, cross or hexagon.
Further, the thickness of described nut is 3mm-4mm.
Further, described body be screw front end away from a section of nut, described screw front end is that drift angle is the taper shape of 30 °-120 °, the length of described screw front end is 1.3mm-1.5mm.
Further, the pure magnesium that this utility model is 99.99% by purity is made, and the composition of described pure magnesium is: Mg:99.99%; Al:0.002%; Si≤0.001%; Ca≤0.001%; Ti≤0.0001%; Mn:0.002%; Fe:0.001%; Ni≤0.0001%; Cu:0.0002%; Zn:0.0028%; Pb:0.0008%.
Compared with the prior art, the pure magnesium screw of the preposition screw thread degradable of one described in the utility model has the following advantages:
1, the shortcoming of afterbody distortion can avoid screw to be screwed into time, thus the homogeneous of exerting all one's strength reach front end, reduced the possibility of screw distortion and fracture;
2, nut has pressurization, can fixedly secure bone piece or bone lobe, the structure of half-thread to tension force larger fixedly there is the better fixation of controlling;
3, distortion and the fracture of screw thread in the time implanting the hard sclerotin such as cortical bone have been avoided;
4, take out without second operation, alleviate patient suffering.
The material of the pure magnesium screw of preposition screw thread degradable described in the utility model has degradability and takes out without second operation, magnesium elements belongs to one of trace element of needed by human, almost participates in metabolic processes all in human body and also has the effect of induction of bone growth; Magnesium alloy has the density and the mechanical performance that approach the most with people's bone, and has the highest specific strength in all metals.Degradable magnesium alloy screw of the present utility model, preparation method is simple, cost is low, is conducive to implement and clinical practice, is suitable for the needs of extensive patients.
Brief description of the drawings
Fig. 1 is the structural representation of this utility model embodiment.
Fig. 2 is the screw thread vertical section schematic diagram of this utility model embodiment.
Fig. 3 is the using state schematic diagram of this utility model embodiment.
Detailed description of the invention
As depicted in figs. 1 and 2, the pure magnesium screw of a kind of preposition screw thread degradable, comprises body 1 and nut 2, and described body 1 is provided with screw thread 11, and the preferred 25mm-30mm of body 1 length, can adopt suitable length according to the feature of implant site etc.; Described nut 2 is provided with profile counterbore 21, and operation tool easy to use is installed and used; Described screw thread 11 length are 0.3-0.5:1 with the ratio of body 1 length, preferably 0.5:1, described nut 2 is pressurization nut, the face that described pressurization nut is connected with body 1 and the angle of body centrage are 22 °-30 °, this design can again give a pressurization after screw is implanted completely, fixedly secures bone piece or bone lobe.
The width of described screw thread 11 is 0.5mm-0.7mm, the spacing of described screw thread 11 is 0.55mm-0.75mm, the degree of depth of described screw thread 11 is the 1/10-1/5 of the diameter of described body, lead angle is 5 °-20 °, and this design has avoided causing screw thread distortion and fracture in the time implanting the hard sclerotin such as cortical bone.
The tooth side angle α of described screw thread 11 is 30 °-50 °.
Described profile counterbore 21 is in-line, cross or hexagon.
The thickness of described nut 2 is 3mm-4mm, the shortcoming of afterbody distortion can avoid magnesium screw to be screwed into time, thereby the homogeneous of exerting all one's strength reach front end, reduced the possibility of screw distortion and fracture.
Described screw front end 12 for drift angle be the taper shape of 30 °-120 °, the length of described screw front end 12 is 1.3mm-1.5mm.
The pure magnesium that the pure magnesium screw of described preposition screw thread degradable is 99.99% by purity is made, and the composition of described pure magnesium is: Mg:99.99%; Al:0.002%; Si≤0.001%; Ca≤0.001%; Ti≤0.0001%; Mn:0.002%; Fe:0.001%; Ni≤0.0001%; Cu:0.0002%; Zn:0.0028%; Pb:0.0008%, the elastic modelling quantity of described pure magnesium is about 10000MPa.
As shown in Figure 3, two one of them objects of object that the preposition helicitic texture of the present embodiment is almost all arranged in screw thread 11 to be fixed, hold is mainly between screw thread 11 and nut 2, is particularly suitable for larger fixing of tension force.
In screw use procedure, after boring, choose the screw of appropriate length with determinator, duct is extended to screw thread and mated with tapping, then screw is screwed into.Due to the low easy distortion of pure magnesium screw intensity, thus self tapping ability do not possessed, therefore select the tapping of coupling duct to be expanded very important.
Embodiment mono-
The pure magnesium screw of a kind of preposition screw thread degradable, body 1 length is 25mm, and the face that nut 2 is connected with body 1 and the angle of body centrage are 22 °, and the thickness of nut 2 is 3mm, described screw thread 11 length are 0.5:1 with the ratio of body 1 length, the width of thread is 0.5mm, and flight pitch is 0.55mm, and the depth of thread is 1/10 of body diameter, lead angle is 5 °, tooth side angle α is 50 °, and screw front end 12 drift angles are 120 °, and the length of screw front end 12 is 1.3mm.
The pure magnesium component that the present embodiment uses is: Mg:99.99%; Al:0.002%; Si:0.0007%; Ca:0.0003%; Ti:0.0001%; Mn:0.002%; Fe:0.001%; Ni:0.0001%; Cu:0.0002%; Zn:0.0028%; Pb:0.0008%.
Embodiment bis-
The pure magnesium screw of a kind of preposition screw thread degradable, body 1 length is 28mm, and the face that nut 2 is connected with body 1 and the angle of body centrage are 26 °, and the thickness of nut 2 is 3.5mm, described screw thread 11 length are 0.4:1 with the ratio of body 1 length, the width of thread is 0.6mm, and flight pitch is 0.65mm, and the depth of thread is 1/7 of body diameter, lead angle is 10 °, tooth side angle α is 40 °, and screw front end 12 drift angles are 90 °, and the length of screw front end 12 is 1.4mm.
The pure magnesium component that the present embodiment uses is: Mg:99.99%; Al:0.002%; Si:0.001%; Ca:0.00005%; Ti:0.00005%; Mn:0.002%; Fe:0.001%; Ni:0.0001%; Cu:0.0002%; Zn:0.0028%; Pb:0.0008%.
Embodiment tri-
The pure magnesium screw of a kind of preposition screw thread degradable, body 1 length is 30mm, and the face that nut 2 is connected with body 1 and the angle of body centrage are 30 °, and the thickness of nut 2 is 4mm, described screw thread 11 length are 0.5:1 with the ratio of body 1 length, the width of thread is 0.7mm, and flight pitch is 0.75mm, and the depth of thread is 1/5 of body diameter, lead angle is 20 °, tooth side angle α is 30 °, and screw front end 12 drift angles are 30 °, and the length of screw front end 12 is 1.5mm.
The pure magnesium component that the present embodiment uses is: Mg:99.99%; Al:0.002%; Si:0.00008%; Ca:0.001%; Ti:0.0001%; Mn:0.002%; Fe:0.001%; Ni:0.00002%; Cu:0.0002%; Zn:0.0028%; Pb:0.0008%.
The above; it is only preferably detailed description of the invention of this utility model; but protection domain of the present utility model is not limited to this; any be familiar with those skilled in the art this utility model disclose technical scope in; be equal to replacement or changed according to the technical solution of the utility model and inventive concept thereof, within all should being encompassed in protection domain of the present utility model.
Claims (6)
1. the pure magnesium screw of preposition screw thread degradable, comprise body and nut, described body is provided with screw thread, described nut is provided with profile counterbore, it is characterized in that: described reach is 0.3-0.5:1 with the ratio of body length, described nut is tapered cup nut, and the angle of the conical surface of described tapered cup nut and body centrage is 22 °-30 °.
2. the pure magnesium screw of preposition screw thread degradable according to claim 1, it is characterized in that: the width of described screw thread is 0.5mm-0.7mm, the spacing of described screw thread is 0.55mm-0.75mm, and the 1/10-1/5 lead angle of the diameter that the degree of depth of described screw thread is described body is 5 °-20 °.
3. the pure magnesium screw of preposition screw thread degradable according to claim 2, is characterized in that: the tooth side angle α of described screw thread is 30 °-50 °.
4. the pure magnesium screw of preposition screw thread degradable according to claim 1, is characterized in that: described profile counterbore is in-line, cross or hexagon.
5. the pure magnesium screw of preposition screw thread degradable according to claim 1, is characterized in that: the thickness of described nut is 3mm-4mm.
6. the pure magnesium screw of preposition screw thread degradable according to claim 1, it is characterized in that: described body be screw front end away from one section of nut, described screw front end is that drift angle is the taper shape of 30 °-120 °, and the length of described screw front end is 1.3mm-1.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420475383.3U CN203988332U (en) | 2014-08-21 | 2014-08-21 | The pure magnesium screw of a kind of preposition screw thread degradable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420475383.3U CN203988332U (en) | 2014-08-21 | 2014-08-21 | The pure magnesium screw of a kind of preposition screw thread degradable |
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| CN203988332U true CN203988332U (en) | 2014-12-10 |
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| CN201420475383.3U Active CN203988332U (en) | 2014-08-21 | 2014-08-21 | The pure magnesium screw of a kind of preposition screw thread degradable |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104257423A (en) * | 2014-08-21 | 2015-01-07 | 赵德伟 | Pure magnesium bolt with degradable front-arranged threads |
| WO2017071335A1 (en) * | 2015-10-28 | 2017-05-04 | 赵德伟 | Porous tantalum metal hollow screw and applications thereof |
| CN111050692A (en) * | 2017-08-28 | 2020-04-21 | 博蒂斯生物材料有限公司 | Dental screw |
-
2014
- 2014-08-21 CN CN201420475383.3U patent/CN203988332U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104257423A (en) * | 2014-08-21 | 2015-01-07 | 赵德伟 | Pure magnesium bolt with degradable front-arranged threads |
| WO2017071335A1 (en) * | 2015-10-28 | 2017-05-04 | 赵德伟 | Porous tantalum metal hollow screw and applications thereof |
| CN111050692A (en) * | 2017-08-28 | 2020-04-21 | 博蒂斯生物材料有限公司 | Dental screw |
| US11291548B2 (en) | 2017-08-28 | 2022-04-05 | botiss biomaterials GmbH | Dental screw |
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