Blood sampling device for obtaining small quantity of venous blood
First Claim
1. A device for utilizing venous blood pressure for drawing a blood sample, said device comprising:
- (a) a first tublar body providing a first collection reservoir for receiving the blood sample.(b) a needle mounted on one end of said tublar body for drawing the blood sample into said collection reservoir;
(c) first valve means on the opposite end of said tubular body, said first valve means including a hydrophobic porous portion to allow flow of air from said collection reservior through said first valve means while blocking flow of blood from said collection reservoir through said first valve means, and said first valve means further including a passage formed in situ adjacent said hydrophobic porous portion which passage is operable to allow flow of blood from said collection reservoir through said first valve means; and
(d) closure means for selectively closing said passage when a blood sample is drawn into said first collection reservoir through said needle.
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Accused Products
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.
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Citations
20 Claims
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1. A device for utilizing venous blood pressure for drawing a blood sample, said device comprising:
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(a) a first tublar body providing a first collection reservoir for receiving the blood sample. (b) a needle mounted on one end of said tublar body for drawing the blood sample into said collection reservoir; (c) first valve means on the opposite end of said tubular body, said first valve means including a hydrophobic porous portion to allow flow of air from said collection reservior through said first valve means while blocking flow of blood from said collection reservoir through said first valve means, and said first valve means further including a passage formed in situ adjacent said hydrophobic porous portion which passage is operable to allow flow of blood from said collection reservoir through said first valve means; and (d) closure means for selectively closing said passage when a blood sample is drawn into said first collection reservoir through said needle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for drawing a sample of blood solely by venous blood pressure, said device comprising:
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(a) an elastomeric tubular member forming a blood collection reservoir and an adjacent blood sampling reservoir; valve mens interposed between said collection reservoir and said sampling reservoir, said valve means including an air permeable portion and an in situ blood passage, and said valve means being operable, when said blood passage is closed, to allow flow of air while blocking flow of blood from said collection reservoir to said sampling reservoir through said valve means, and operable when said blood passage is open, to allow flow of blood from said collection reservoir to said sampling reservoir; and (c) a blood drawing needle mounted at the end of said collection reservoir remote from said valve means for drawing blood into said collection reservoir. - View Dependent Claims (9, 10, 11, 12)
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13. A device for drawing a sample of blood solely by venous blood pressure, said device comprising:
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(a) an elastomeric tubular member forming a blood collection reservoir and an adjacent blood sampling reservoir; (b) a sleeve of hydrophobic material disposed in said tubular member between said reservoirs, said sleeve having a through bore forming a passage between said reservoirs; (c) a blood drawing needle disposed at an end of said collection reservoir remote from said sleeve, said needle providing means for drawing blood into said collection reservoir; (d) said tubular member being bent upon itself to position said sampling reservoir side-by-side with said collection reservoir and to form a kink in said tubular member and said sleeve to close said passage between said reservoirs, whereby said sleeve allows flow of air from said collection reservoir to said sampling reservoir during the drawing of a blood sample but blocks flow of blood from said collection reservoir to said sampling reservoir; and (e) said passage being operable to allow blood to pass therethrough by manipulating said tubular member to remove said kink. - View Dependent Claims (14, 15, 16, 17)
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18. In a blood sampling device, a valve comprising:
- an outer elastomeric tube which is impervious to both air and blood, and an inner sleeve formed from a hydrophobic material pervious to air but impervious to blood, said inner sleeve including a central through passage, said valve being closable to the passage of blood while allowing the passage of air by binding said outer tube and said inner sleeve sufficiently to form a kink in said tube and sleeve which closes said through passage, and said valve being openable to the passage of blood by unbending said tube and sleeve sufficiently to eliminate said kink and open said through passage.
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19. A device for drawing a plurality of blood samples with a single venapuncture solely by venous blood pressure, said device comprising:
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(a) a first tubular molded plastic member forming a first blood collection reservoir; (b) a second tubular molded plastic member forming a second blood collection reservoir; (c) a molded plastic web integral with said first and second tubular members and interconnecting the latter so that said tubular members are disposed in side-by-side relationship; (d) vent means at one end of each of said collection reservoirs for venting air from said reservoirs during drawing of a blood sample, said vent means being operable to prevent the flow of blood therethrough; (e) a blood drawing needle at the end of said first collection reservoir opposite said vent means for drawing a blood sample into said first collection reservoir; and (f) a transverse passage extending through said web from said first collection reservoir to said second collection reservoir to provide means for transferring blood from said first collection reservoir to said second collection reservoir. - View Dependent Claims (20)
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Specification