Microsample blood collecting device
First Claim
1. A device for collecting a micro sample of blood for laboratory analysis comprising:
- a hypodermic needle;
a mixing chamber having an inlet conduit in fluid communication with said needle and an outlet conduit, the cross-sectional area of said chamber being substantially larger than the respective cross-sectional areas of said inlet and outlet conduit, said outlet conduit having a bore which is smaller than the bore of said inlet conduit, whereby in use of said device, said mixing chamber remains full of blood;
an anticoagulant in said chamber in an amount sufficient to prevent coagulation of a blood sample collected in said device;
a capillary tube having first and second ends,said first end of said tube being in fluid communication with said outlet conduit of said mixing chamber; and
a hydrophobic filter in fluid communication with said second end of said capillary tube, said filter being effective to permit the escape of air from said tube while blocking the passage of blood therethrough.
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Accused Products
Abstract
A microsample device for blood sample collection comprises a hypodermic needle to which is attached a mixing chamber having an enlarged bore relative to the bore of its inlet and outlet conduits, and a supply of a soluble solid anticoagulant contained within the chamber. The anticoagulant is automatically mixed with the blood sample in the mixing chamber, eliminating the need for mixing balls or other mechanical mixing elements. The exit conduit from the mixing chamber leads to a capillary tube of sufficient length to accommodate a desired blood sample. The free end of the capillary tube is provided with a hydrophobic filter which permits air to escape from the interior of the collecting device as the blood sample enters but which blocks the further flow of blood as soon as the device is filled.
238 Citations
7 Claims
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1. A device for collecting a micro sample of blood for laboratory analysis comprising:
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a hypodermic needle; a mixing chamber having an inlet conduit in fluid communication with said needle and an outlet conduit, the cross-sectional area of said chamber being substantially larger than the respective cross-sectional areas of said inlet and outlet conduit, said outlet conduit having a bore which is smaller than the bore of said inlet conduit, whereby in use of said device, said mixing chamber remains full of blood; an anticoagulant in said chamber in an amount sufficient to prevent coagulation of a blood sample collected in said device; a capillary tube having first and second ends, said first end of said tube being in fluid communication with said outlet conduit of said mixing chamber; and a hydrophobic filter in fluid communication with said second end of said capillary tube, said filter being effective to permit the escape of air from said tube while blocking the passage of blood therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification