Blood sampling assembly having porous vent means vein entry indicator
First Claim
1. A multiple blood sampling assembly adapted to be coupled with an evacuated container to obtain blood samples from a patient, comprising:
- a housing having a forward end and a rear end and having a chamber therein, the chamber having walls which are at least partially translucent;
a first cannula mounted to a forward end of the housing and in fluid communication with the chamber;
a second cannula mounted to the rear end of the housing and in fluid communication with the chamber;
a cup chaped one-way valve positioned within the chamber and having a resilient skirt which sealingly bears against the walls of the chamber when blood flows under tourniquet pressure from said first cannula; and
venting means in the form of a porous material within said chamber, said venting means positioned within said chamber such that blood may flow under tourniquet pressure from the first cannula into the chamber only up to the point where the one-way valve is located as gas is displaced through the venting means, the venting means also positioned such that gas is displaced from a portion of the chamber on a side of the valve towards the first cannula, through the venting means, and to the atmosphere via the second cannula.
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Accused Products
Abstract
A blood sampling assembly is provided which has a cannula designed for intravenous penetration, a mechanism for applying negative pressure to the cannula, a chamber located between the cannula and the source of negative pressure, a one-way valve positioned within the chamber, and a venting member within the chamber which allows the venting of air as blood enters the chamber, but does not allow the passage of blood. A person drawing blood is enabled to visually determine when a needle is properly inside a vein through transparent walls of the chamber. Spillage of blood is avoided with the present assembly by the resistance of the one-way valve to flow distally from the intravenous cannula.
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Citations
10 Claims
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1. A multiple blood sampling assembly adapted to be coupled with an evacuated container to obtain blood samples from a patient, comprising:
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a housing having a forward end and a rear end and having a chamber therein, the chamber having walls which are at least partially translucent; a first cannula mounted to a forward end of the housing and in fluid communication with the chamber; a second cannula mounted to the rear end of the housing and in fluid communication with the chamber; a cup chaped one-way valve positioned within the chamber and having a resilient skirt which sealingly bears against the walls of the chamber when blood flows under tourniquet pressure from said first cannula; and venting means in the form of a porous material within said chamber, said venting means positioned within said chamber such that blood may flow under tourniquet pressure from the first cannula into the chamber only up to the point where the one-way valve is located as gas is displaced through the venting means, the venting means also positioned such that gas is displaced from a portion of the chamber on a side of the valve towards the first cannula, through the venting means, and to the atmosphere via the second cannula.
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2. A multiple blood sampling assembly adapted to be coupled with an evacuated container to obtain blood samples from a patient, which provides a visual indication of venipuncture without the spillage of blood, comprising:
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a housing having a forward end and a rear end and having a chamber therein, the chamber having walls which are at least partially translucent; a cannula mounted to the forward end of the housing and in fluid communication with the chamber; a one-way valve within the chamber, said valve permitting flow distally from the patient only when a source of negative pressure is applied; and a porous plug inserted within said one-way valve, said plug allowing the flow of gas therethrough but substantially preventing the flow of blood, the valve and plug positioned within said chamber such that blood may flow from the cannula into the chamber up to the point where the one-way valve is located as gas is displaced through the porous plug. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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Specification