Abstract
MICRO-PIPETTES are blunt by their very physical nature. A micro-injection needle would be a more appropriate instrument for penetrating and injecting small biological specimens. Such a needle is shown in the photographs (1, side view; 2, viewed from above). It has a chisel-like extremity. The microscopical glass-forging method1,2 by which it is prepared permits orifices of all sizes to be made, with a lower limit of a few microns. It is made by drawing out a capillary tube in which a lateral hole has been blown. When the extremely narrowed tube breaks, half the elongated hole is severed. The remaining half has become terminal.
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References
Schouten, S. L., Z. wissensch. Mikr. und Mikr. Techn., 51, 421 (1934).
de Fonbrune, P., “Technique de Micromanipulation” (Masson et Cie., Paris, 1950).
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WORST, J. A Micro-Injection Needle. Nature 169, 631–632 (1952). https://doi.org/10.1038/169631b0
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DOI: https://doi.org/10.1038/169631b0
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