The manufacture of surgical ligatures and sutures

Abstract

Abstract Magnesium or magnesium alloy suture material prepared, according to the parent Specification, in the form of very fine wires or ropes formed from such wires, is formed with a uniform protective surface layer in order to retard resorption in the body. The layer may be formed by treatment with aqueous caustic potash or soda, for example by boiling with 4 per cent or stronger caustic potash or soda solution, or by one of the following methods: (a) treatment with steam, e.g. for fifteen minutes at ten atmospheres; (b) dipping into or brushing with aqueous or alcoholic-phenol solution; (c) dipping into an aqueous solution of a fluoride such as hydrogen fluoride, potassium bifluoride, ammonium polyfluorides, or a saturated solution of sodium fluoride; (d) dipping into an aqueous bath, containing 10 per cent of sodium bichromate and 10 per cent of tin sulphate, or 2 per cent of aluminium sulphate and 0,5 per cent of chromium sulphate, at 70-80 DEG C., or containing other heavy metal salts; (e) suspending for about half an hour in a closed space over concentrated aqueous ammonia. Wires having a diameter of 0,04-0,1 millimetres are referred to.ALSO:Magnesium or magnesium alloy suture material prepared, according to the parent Specification, in the form of very fine wires or ropes formed from such wires, is formed with a uniform protective surface layer in order to retard resorption in the body. The layer may be formed by treatment with aqueous caustic potash or soda, for example by boiling with 4 per cent or stronger caustic potash or soda solution, or by one of the following methods; (a) treatment with steam, e.g. for fifteen minutes at ten atmospheres; (b) dipping into or brushing with aqueous or alcoholic phenol solution; (c) dipping into an aqueous solution of a fluoride such as hydrogen fluoride, potassium bifluoride, ammonium polyfluorides, or a saturated solution of sodium fluoride; (d) dipping into an aqueous bath, containing 10 per cent of sodium bichromate and 10 per cent of tin sulphate, or 2 per cent of aluminium sulphate and 0,5 per cent of chromium sulphate, at 70-80 DEG C., or containing other heavy metal salts; (e) suspending for about half an hour in a closed space over concentrated aqueous ammonia. Wires having a diameter of 0,04-0,1 millimetres are referred to.

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