Composition and sampling receptacle method for treating blood with anticoagulant
First Claim
1. A blood sampling device comprising receptacle means defining a blood receiving space therein for receiving a blood sample, said means includinga blood inlet means for introducing a sample of whole blood into the blood receiving space,an anticoagulant present within said space, the anticoagulant being an anticoagulant capable of binding cation ion species in blood, andan additive present within said space and including several selected cation species which occur in blood, each species in the additive being present in an amount substantially corresponding to the binding capacity for that species that the anticoagulant exhibits when in equilibrium with a blood sample of substantially the same volume as that of said receptacle so as to ensure substantially the same concentration of each of the selected cation species in an unbound condition in the blood after the blood has been introduced into the blood receiving space as is in the blood prior to being introduced into said space.
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Accused Products
Abstract
In order to counteract coagulation of a blood sample which is collected from an animal or a human body (24) and introduced into a receptacle, such as a syringe chamber (14), an anticoagulant is added to the sample within the receptacle. The anticoagulant may be capable of binding cation species in the blood, which are subsequently to be measured. Such cation species comprise hydrogen ions, ammonium ions, alkaline metal ions such as potassium and sodium ions, and alkaline earth metal ions such as magnesium and calcium ions. In order to compensate for the proportions of selected cation species which are bound by the anticoagulant, an additive containing such cation species is added to the blood sample so as to obtain substantially the same concentration of the selected cation species in an unbound condition in the anticoagulant treated blood sample as in the untreated blood sample.
The anticoagulant and the additive are preferably added to the blood sample as a composition which may be deposited on or carried by a carrier body (15) which may be arranged within the receptacle in which the blood sample is introduced. The bulk density of the nonwetted carrier body is preferably smaller than the specific weight of the blood sample so as to avoid trapping of air bubbles within the receptacle. In its wetted condition the bulk density of the carrier body is preferably also different from the specific weight of the blood sample so that the carrier body (15) may be used as an agitating member improving mixing of the anticoagulant composition with the blood sample. The carrier body (15) may, for example, be made of filtering paper.
50 Citations
24 Claims
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1. A blood sampling device comprising receptacle means defining a blood receiving space therein for receiving a blood sample, said means including
a blood inlet means for introducing a sample of whole blood into the blood receiving space, an anticoagulant present within said space, the anticoagulant being an anticoagulant capable of binding cation ion species in blood, and an additive present within said space and including several selected cation species which occur in blood, each species in the additive being present in an amount substantially corresponding to the binding capacity for that species that the anticoagulant exhibits when in equilibrium with a blood sample of substantially the same volume as that of said receptacle so as to ensure substantially the same concentration of each of the selected cation species in an unbound condition in the blood after the blood has been introduced into the blood receiving space as is in the blood prior to being introduced into said space.
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24. A method of treating a blood sample with an anticoagulant, said method comprising
passing a predetermined volume of a sample of whole blood into a receptacle, adding to the blood sample within the receptacle a predetermined amount of the anticoagulant, which is capable of binding different cation species in the blood, and adding to the blood sample within the receptacle an additive including selected ones of said different cation species in amounts compensating for proportions of the selected cation species bound by the anticoagulant so as to obtain substantially the same concentration of the selected cation species in an unbound condition in the anticoagulant treated blood sample as in the untreated blood sample.
Specification