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Note on an Improved Radium-Needle Filter

This excerpt was created in the absence of an abstract.

A need has arisen for a radium-needle filter with a cap which cannot come unscrewed while in use.

I have had a filter made fitted with the usual screw cap made flush with the surface of the filter. A hole is bored, passing through the cap and screw portion of the body of the filter. When the cap is screwed up tightly the holes register; the hole serves the purpose of an eye for the securing thread or wire to pass through, which thus holds the cap and filter together securely. The cap is grooved above the hole so that the thread can lie flush in the groove; this groove also serves a useful purpose in providing a grip for a small tightening key, used to ensure the cap being screwed up tightly.

The outer surface of the filter is quite smooth in every way, without any projections, and can thus be inserted in the tissues easily with the usual trocar and canula; there is also, therefore, no difficulty in withdrawing the filter.

These filters have been in use for some months now, and have proved quite efficient. They have been made for me in platino-iridium by Messrs. Johnson, Matthey & Co. Ltd., of Hatton Gardens, London, E.C.