How blood met plastics, plant and animal extracts: Material encounters between medicine and industry in the twentieth century.

Twentieth-century medicine saw the remarkable rise of complex machines and infrastructures to process blood for medical purposes, such as transfusion, dialysis, and cardiac surgery. Instead of attributing these developments to technological ingenuity, this article argues for the primacy of material encounters as a promising focal point of medical historiography. In fact, blood's special properties consistently clashed with most materials used in medical practice, provoking a series of material exchanges. Drawing on a combination of epistemological and network approaches, three exemplary cases are presented to examine blood's encounters with plastics, plant and animal extracts: William M. Bayliss's (1860-1926) injections of dissolved gum acacia to expand diminished blood volume; Charles H. Best's (1899-1978) production of the anticoagulant heparin from animal organs; and the preservation of fragile blood cells by silicone coatings inside of John H. Gibbon Jr.'s (1903-1973) heart-lung machine. The case studies demonstrate how the complementarity of blood and these materials produced hybridizations between medicine and a range of industrial branches, from colonial forestry and meatpacking to commercial chemistry. In this light, the paper concludes by discussing the dependencies of today's healthcare environments on globally distributed, capitalistically appropriated resources in the face of crises like the COVID-19 pandemic.

[Operating upon the Bloodless Heart : A History of Surgical Time between Craft, Machines and Organisms, 1900-1950]. / Operieren am blutleeren Herzen : Eine Geschichte chirurgischer Zeit zwischen Handwerk, Maschinen und Organismen, 1900­1950.

Up until now time has rarely been considered in the historiography of surgery. However, the emergence of modern operating procedures is based significantly on establishing controlled relations of time by adjusting organic, technological and organizational processes. Early cardiac surgery in particular faced a crucial time problem: excluding the heart from the circulatory system long enough to operate inside its bloodless chambers. This problem can be traced back to the early 20th century, when surgeons such as Ludwig Rehn (1849-1930), Friedrich Trendelenburg (1844-1924), and Alexis Carrel (1873-1944) experimented with occlusions of the great vessels. Throughout the first half of the century, various attempts were made to prolong the possible time of circulatory arrest. In this regard, Arthur W. Meyer (1885-1934) in Berlin developed surgical craft procedures, John H. Gibbon Jr. (1903-1973) worked on constructing a heart-lung machine in Boston/Philadelphia, and Wilfred G. Bigelow in Toronto experimented with lowering the temperature of the body. Meticulous scrutiny of these developments illustrates how heterogeneous periods, rhythms, and paces had to be harmonized in order to gain decisive minutes or even seconds. Therefore, major developments on the way to open heart surgery can be described as a history of surgical time.