(57) A sample tube valve body (10) comprises a tubular body formed at one end with e.g.
a socket (12) for attachment to an end of an e.g. glass tube (1), the tubular body
being formed with a restriction in internal diameter at (16) and provided with a valve
member (20) (e.g. a lead shot) between the restriction (16) and the opposite end of
the tubular body. With the valve body (10) attached to the tube (1), a sample of e.g.
blood may be drawn up to the tube by suction to above the restriction (16), then allowed
to drain down, in which case the sample will be held at the level of the valve member
(20) seating on the restriction (16) by surface tension effects. The valve body is
simple to manufacture and may be disposed of after use, whilst the tube (1) may be
washed and re-used.
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