Abstract: This device is adapted for taking venous blood samples without the aid of any auxiliary negative pressure. Venous blood pressure is the sole force which fills the device with the blood sample. The device includes a flexible plastic tube formed from polyethylene or the like and further includes a blood drawing needle mounted on one end of the tube. The tube is divided into a collection reservoir into which the sample is drawn, and a sampling reservoir into which the sample may be expressed from the collection area. A valve separates the two areas. Also included in an elastomeric needle closure which adapts the device for in situ centrifugation of the blood sample in a test tube.

Abstract: This device is adapted for taking venous blood samples without the aid of any auxiliary negative pressure. Venous blood pressure is the sole force which fills the device with the blood sample. The device includes a flexible plastic tube formed from polyethylene or the like and further includes a blood drawing needle mounted on one end of the tube. A valved closure is disposed at the other end of the tube, the valve being operable to allow passage of air from the tube when the sample is drawn. The valve does not, however, allow the passage of blood from the tube. The tubes may be connected in tandem so as to allow the drawing of two samples with one venipuncture. The first tube can be devoid of an anti-coagulant coating while the second tube can include an anticoagulant coating. In this way, one drawn sample will be anti-coagulated and the other will not.