Blood sampling and infusion chamber

Claim 1

Apparatus for blood sampling and infusion comprising: a chamber formed from a fluid impervious material having an opening surrounded with an outwardly flared edge, an entry port and an exit port, said ports each being contoured for connection to a cannula for insertion into a patient's bloodstream to permit the flow of blood through said chamber, a resilient plug means for snugly fitting into said opening and extending part way into said chamber to define a given cavity in said chamber, said plug means being provided with a flange extending laterally of its length for seating on said edge of the opening of said chamber, said resilient plug means being formed of a nontoxic sterilizable material pierceable by a needle and self-sealing upon withdrawal of the needle to afford removable communication with said cavity by means of a hollow needle supplying or withdrawing fluids between said cavity and a patient, a cover for said opening of said chamber, said cover extending over the part of said plug means extending outwardly of said opening and overlapping the edges of said plug means seated on said flared edges of said opening in said chamber and fastened to the outside of said chamber, and clamping means for engaging the outside of the chamber for fastening the apparatus to the patient, the outer periphery of said chamber being provided with a groove within which said clamping means extends in a snug fitting arrangement for firmly holding said chamber to a patient.