Abstract: A fastener comprises a filament having two opposing heads. The heads have two ends defining non-parallel planes, forming acute angles which share a common ray. The fastener is installed by being driven through two needles having slotted bores.

Abstract: Surgical prosthetic apparatus for joining the ends of organic tubular vessels to be anastomosed consisting of a tubule over which the ends to be joined are drawn, combined with a clamp consisting of two flat parts with a channel between them. The channel is clamped over the tubule by means of screws through the clamp parts, which are drawn together and clamps the walls of the vessel against the outside of the tubule, so that the ends are prevented from sliding apart. The screws may advantageously be locked by means of locking screws. The clamping pressure can be monitored by means of a manometer having a pressure sensing bulb which can be inserted into a cavity formed between the clamp parts.