Blood sampling device with blood-viewing chamber
OwnerDieter Wendelborninventor
Life of this patent
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Abstract
A blood sampling device comprises a pointed cannula (3, 23) at each end, a pre-evacuated sample container (1, 21) with a self-sealing stopper (2, 22) which can be perforated, a self-sealing membrane (8,28) which can be perforated and a blood-viewing chamber (7, 27) the walls of which are surrounded by transparent material arranged in front of the stopper (2, 22) in the direction of perforation. The chamber (7, 27) is arranged on the stopper (2, 22) and is sealed off essentially from the sample container (1, 21) by said stopper (2, 22) and from the patient by the membrane (8, 28).
Claims7
A blood sampling device comprising the combination of
- a hollow needle pointed at both ends;
- means for supporting said needle with a first end thereof positioned to enter a blood vessel of a patient;
- a single pre-evacuated blood sample chamber having a central axis, said sample chamber slidable engaging said means for supporting said needle;
- a single self-sealing stopper which can be pierced by said needle, said stopper being mounted at one end of said sample chamber;
- and
- a blood observation chamber positioned axially toward said needle from said sample chamber, said observation chamber being closed at one end by said stopper and having a transparent side and a needle-piercable membrane closing an end away from said stopper, said observation chamber having an internal pressure substantially equal to ambient pressure;
- said sample chamber and said observation being joined into a fixedly connected working unit substantially inseparable during the process of taking a blood sample and being separable for removing the blood sample.
A blood sampling device comprising the combination of
- a hollow needle pointed at both ends;
- means for supporting said needle with a first end thereof positioned to enter a blood vessel of a patient;
- a single pre-evacuated blood sample chamber having a central axis, said sample chamber being slidably coupled to said means for supporting said needle;
- a single self-sealing stopper which can be pierced by said needle at one end of said sample chamber;
- and
- a blood observation chamber comprising a transparent protective tubular sleeve overlapping said one end of said sample chamber and attached to said stopper, said observation chamber projecting beyond said stopper and being closed at one end by said stopper and having a needle-piercable membrane closing an end away from said stopper and toward said first end of said needle, said observation chamber having an internal pressure substantially equal to ambient pressure;
- said sample chamber and said observation chamber being joined into a fixedly connected working unit substantially inseparable during the process of taking blood sample and being separable for removing the blood sample.
Dependencies are inferred from the claim text.