Porous implant
A technology for implants and inlays, applied in the field of implants, can solve problems such as particle wear and achieve the effect of avoiding particle wear
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example 1
[0040] Example 1 (implant with inlay obtained by net-shape sintering)
[0041] The first region 2 of the implant in the form of titanium foam 8 in the "green" state and the second region 3 of the implant made of fully dense material in the form of a titanium inlay are bonded together before the sintering process (Fig. 2). As shown in FIG. 2 , the second region 3 in the form of an inlay is loosely arranged in the countersink 7 of the titanium foam 8 in the “green” state.
[0042] The second area 3, the inlay, comprises means 4 cooperating with tools for handling the implant or for receiving fixation means for fixing the implant 1 to the bone (Fig. 1). In order to avoid particle wear during handling and / or fixing of the implant 1, the average porosity P of the material of the second region, i.e. the insert 3 (eg less than 10%) than the average porosity of the surrounding green body (eg between 30-90%). The mechanically stable connection between the second region 3 in the for...
example 2
[0043] Example 2 (implant with insert obtained by post-sintering treatment)
[0044]Optionally, a fully dense second region 3 in the form of a fixed inlay is inserted into the said first region 2 by force (mechanically) or by shrinking said first region 2 onto said second region 3, i.e. the inlay. In the foam structure of the sintered first region 2 described above. After sintering the first region 2, either by mechanical means of press fit or by exploiting the difference in thermal expansion between the two regions 2, 3 (ie heating the outer first region 2 and / or cooling the second region 3 The insert) inserts the second region 3 , the insert, into the countersink 7 ( FIG. 2 ) in the sintered first region 2 . In order to avoid particle abrasion, the material of said second zone 3 preferably has a porosity below 10%, while the material of the surrounding first zone 2 preferably has a porosity between 30% and 90%.
example 3
[0045] Example 3 (with an insert held in place by gravity during the green state)
[0046] Figures 1 to 3 show a hollow second region 3, i.e. an inlay, which has an internal thread 15 (Fig. 1) and is made of a titanium alloy (TAN) within the reinforcement layer 9 of the first region 2 in the form of titanium foam, The reinforcing layer 9 thus has a porosity of 10-20%. The second region 3 , the inlay, serves as an interface for an implant holder (not shown) screwed into the internal thread 15 of the implant 1 .
[0047] Before sintering, the threaded second region 3 ie the inlay is placed manually into the countersink 7 of the upright first region 2 in the form of titanium foam 8 in the "green" state ( FIG. 2 ). In the case of the embodiment of Figures 2 and 3, there is a gap "s" between the second region 3, ie the outer wall 11 of the insert, and the wall 12 of the countersink 7, during sintering, the first The second zone 3, the inlay, is held in place by gravity. During s...
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