Blood withdrawal apparatus and method of using same
First Claim
1. A blood withdrawal apparatus adapted to be mounted in flow communication with an intravenous catheter for collecting in a blood sample test tube samples of blood withdrawn through the intravenous catheter and an entry device, the intravenous catheter positioned in a vein of a subject receiving intravenous fluid and the entry device in flow communication with the intravenous fluid and the intravenous catheter, comprising:
- a test tube housing formed having a test tube receiving chamber for receiving the blood sample test tube therein, said test tube housing having an open end and a closed end;
test tube penetration means within said test tube receiving chamber for penetrating the blood sample test tube when the blood sample test tube is properly positioned with said test tube receiving chamber;
valve means in flow communication with said test tube penetration means and mounted with said test tube housing for regulating the flow of blood to said test tube penetration means from the vein of the subject;
a connecting needle having a bore therethrough, said connecting needle having an upper end mounted with said valve means and said connecting needle formed having a blunt surface adjacent its lower end, said connecting needle being in flow communication with said valve means;
said test tube penetration means, said valve means, and said connecting needle are formed having bores that are axially aligned when said valve means is in an open position; and
,an inner cannula removably mounted substantially within said axially aligned bores formed in said test tube penetration means, said valve means, and said connecting needle for permitting ease of insertion of said connecting needle solely into the entry device, whereupon said inner cannula is removed for exposing said blunt surface on said lower end of said connecting needle.
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Accused Products
Abstract
A new improved blood withdrawal apparatus and method for using same wherein the apparatus includes a test tube housing for receiving a blood sample test tube, a test tube penetration assembly with the test tube housing for penetrating the blood sample test tube, a valve mechanism in flow communication with the test tube penetration assembly and the test tube housing for regulating the flow of blood to the test tube penetration assembly, and a connection assembly with the valve mechanism for connecting the valve mechanism in flow communication with an intravenous catheter positioned in the vein of the subject.
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Citations
16 Claims
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1. A blood withdrawal apparatus adapted to be mounted in flow communication with an intravenous catheter for collecting in a blood sample test tube samples of blood withdrawn through the intravenous catheter and an entry device, the intravenous catheter positioned in a vein of a subject receiving intravenous fluid and the entry device in flow communication with the intravenous fluid and the intravenous catheter, comprising:
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a test tube housing formed having a test tube receiving chamber for receiving the blood sample test tube therein, said test tube housing having an open end and a closed end; test tube penetration means within said test tube receiving chamber for penetrating the blood sample test tube when the blood sample test tube is properly positioned with said test tube receiving chamber; valve means in flow communication with said test tube penetration means and mounted with said test tube housing for regulating the flow of blood to said test tube penetration means from the vein of the subject; a connecting needle having a bore therethrough, said connecting needle having an upper end mounted with said valve means and said connecting needle formed having a blunt surface adjacent its lower end, said connecting needle being in flow communication with said valve means; said test tube penetration means, said valve means, and said connecting needle are formed having bores that are axially aligned when said valve means is in an open position; and
,an inner cannula removably mounted substantially within said axially aligned bores formed in said test tube penetration means, said valve means, and said connecting needle for permitting ease of insertion of said connecting needle solely into the entry device, whereupon said inner cannula is removed for exposing said blunt surface on said lower end of said connecting needle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A blood withdrawal apparatus including an intravenous catheter for collecting samples of blood withdrawn through the catheter, comprising:
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an intravenous catheter positioned in fluid communication with the interior of the vein of a subject; a blood sample test tube; a test tube housing having a test tube receiving chamber for receiving said blood sample test tube therein, said test tube housing having an open end and a closed end; test tube penetration means associated with said test tube receiving chamber for penetrating the blood sample test tube when the blood sample test tube is properly positioned with respect to said test tube receiving chamber; valve means in fluid communication with said test tube penetration means and mounted adjacent said test tube housing for regulating the flow of blood to said test tube penetration means from the vein of the subject; a removable connecting needle having a first and second ends in fluid communication with said valve means for permitting blood to flow from the vein of the subject to said valve means; a mounting cap associated with said valve means to maintain said first end of the connecting needle in operable relation thereto; said connecting needle having a radial mounting flange on its first end to cooperate with said mounting cap such that said connecting needle may be removably mounted adjacent said valve means; and
,the second end of said connecting needle and said intravenous catheter forming a fluid tight seal to prevent flow of intravenous fluid into the vein of the subject. - View Dependent Claims (10)
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11. A blood withdrawal apparatus in flow communication with an intravenous catheter for collecting in a blood sample test tube samples of blood withdrawn through the intravenous catheter and an entry device, the intravenous catheter positioned in a vein of a subject receiving intravenous fluid and the entry device in flow communication with the intravenous fluid and the intravenous catheter, comprising:
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an intravenous catheter; a test tube housing formed having a test tube receiving chamber for receiving the blood sample test tube therein, said test tube housing having an open end and a closed end; test tube penetration means with said test tube receiving chamber for penetrating the blood sample test tube when the blood sample test tube is properly positioned with said test tube receiving chamber; valve means in flow communication with said test tube penetration means and mounted with said test tube housing for regulating the flow of blood to said test tube penetration means from the vein of the subject; a connecting needle having a bore therethrough, said connecting needle having an upper end mounted with said valve means and said connecting needle formed having a blunt surface adjacent to its lower end, said connecting needle being in flow communication with said valve means; said test tube penetration means, said valve means and said connecting needle are formed having bores that are axially aligned when said valve means is in an open position; an inner cannula removably mounted substantially within said axially aligned bores formed in said test tube penetration means, said valve means, and said connecting needle for permitting ease of insertion of said connecting needle solely into the entry device, whereupon said inner cannula is removed for exposing said blunt surface on said lower end of said connecting needle; and said connecting needle sealably engages the intravenous catheter for insuring positive sealing between said connecting needle and the intravenous catheter, thereby preventing flow of intravenous fluids into the vein of the subject.
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12. A method for collecting in a blood sample test tube samples of blood withdrawn through an intravenous catheter positioned in a vein of a subject receiving intravenous fluid, comprising the steps of:
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inserting a connecting needle of a blood withdrawal apparatus into an entry device in flow communication with an intravenous catheter; inserting the connecting needle through the entry device to said intravenous catheter positioned in the vein; and
,sealably positioning the connecting needle in said intravenous catheter so as to prevent the flow of intravenous fluid into said intravenous catheter and permit the withdrawal of blood from the vein of the subject through said intravenous catheter by utilizing the blood withdrawal apparatus. - View Dependent Claims (13, 14, 15, 16)
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Specification