Fluid collection with vacuum loss indicating means

Details Fluid collection with vacuum loss indicating means Fluid collection with vacuum loss indicating means

1975-10-31

1978-03-21

Fisher, J. Reed

Surgery

Truss

Perineal

128DIG5, 116114PV, A61M 100

Patent

active

040797295

ABSTRACT:
A blood collection tube useable with a needle holder for drawing blood from a body vessel. The tube has a rubber stopper with an annular axially extending portion in tight sealing engagement within the bore of the tube for maintaining a negative pressure in the tube. An annular groove in the annular portion of the stopper has a vacuum loss indicating member for providing a visual indication that the tube has or does not have a negative pressure therein. The vacuum loss indicating member may be cobalt chloride responsive to atmospheric moisture, a material including methylene blue that is sensitive to oxygen, or a closed-end manometer which has a quantity of liquid therein in a balanced position when normal negative pressure conditions exist in the tube and which moves within the manometer to visually indicate a loss of pressure when such occurs.

REFERENCES:
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patent: 2621268 (1952-12-01), Lindstrom et al.
patent: 2821951 (1958-02-01), Carver
patent: 3334628 (1967-08-01), Saemann et al.
patent: 3500821 (1970-03-01), Ogle
patent: 3581743 (1971-06-01), Stein
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patent: 3730168 (1973-05-01), McWhorter
patent: 3766918 (1973-10-01), Kessel
patent: 3783870 (1974-01-01), Schachet
patent: 3795147 (1974-03-01), Peterson
patent: 3800780 (1974-04-01), Elliott
patent: 3833000 (1974-09-01), Bridgman
patent: 3850174 (1974-11-01), Ayres

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