The Manufacture of Resorbable Suture Material from Magnesium – Drawing and Stranding of Thin Wires

Abstract

With the aid of multiple wire drawing passes, the magnesium alloys ZEK100, MgCa0.8, and AL36 were reduced to monofilament wires possessing diameters between 0.5 and 0.1 mm. These filaments were subsequently twisted into poly‐filament suture material using stranding. In order to analyze the microstructural constituents and the mechanical‐tribological properties, metallographic specimens were prepared and tensile tests were performed on both monofilament as well as poly‐filament wire strands. Appropriate parameters were ascertained for the wire drawing process with regard to forming rate, temperature, and heat treatment. During the investigations, the alloy ZEK100 exhibited particularly interesting mechanical properties which, owing to its high tensile strengths (up to 550 MPa for monofilament) and fracture strains (up to 30% for poly‐filament), are comparable to those of conventional polymer‐based suture materials. In addition to this, integrating a core (internal, individual wire) into the poly‐filament mesh of wire strands represents an interesting alternative for future research in which structures composed of different materials, and the advantages of combining their properties are brought into particular focus.

Mechanical properties, crystallographic texture, and in vitro bio-corrosion of low-alloyed Zn–Mg, produced by hot and cold drawing for biodegradable surgical wires

“…However, an about 100 MPa increase in relation to the extruded material was recorded regardless of the drawing temperature tested. The achieved values are close to the strength of the wire made of magnesium alloys by Seitz et al [30] and by Milenin et al [31] and are sufficient for the practical use of the obtained material as a surgical wire.…”

The mechanical property and corrosion resistance of Mg-Zn-Nd alloy fine wires in vitro and in vivo

“…Fig. 3 shows mechanical property of ZN20 alloy wires in this study and some typical Mg alloy wires in recent studies [ [25] , [26] , [27] , [28] , [29] ]. These magnesium alloy wires exhibit two characteristics: high strength with lower ductility or good ductility with lower strength.…”

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Fig. 3 The stress-strain curves of the experimental ZN20 alloys at room temperature (a) and comparison of ultimate tensile strength vs. elongation for present ZN20 alloy wires and recent developed magnesium alloy wires (b) [ [25] , [26] , [27] , [28] , [29] ].

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Preparation, microstructure and degradation performance of biomedical magnesium alloy fine wires

“…From 1# to 3# alloys, the compositions of the intermetallics observed are $ 82.3 7 5.2 at% Mg-17.27 5.0 at % Gd-0.57 0.2 at% Zn, 69.87 10.1 at% Mg-29.67 9.9 at% Y-0.8 7 0.2 at% Zn, and 93.5 7 3.6 at% Mg-6.07 3.3 at% Nd-0.5 7 0.3 at% Zn, respectively. According to the reported binary diagrams and literatures [29][30][31][32][33], the intermetallics in the three kinds of as-extruded alloys can be identified as Mg 5 Gd, Mg 24 Y 5 and Mg 12 Nd phase with some Zn atoms dissolved into crystalline lattices, respectively, although the recent work of S. Gorsse et al [34] confirmed that Mg 12 Nd phase is metastable in Mg-Nd system.…”