Dual flow encatheter

Claim 3

The apparatus as claimed in claim 1 wherein: said means to connect said insertion conduit comprises a syringe coupling on said hub.

Claim 4

The apparatus as claimed in claim 1 further comprising: a cavity within said hub in flow connected relationship to said insertion conduit; and, said one-way valve means being within said cavity and adapted for receiving said tube after withdrawal of a needle.

Claim 5

The apparatus as claimed in claim 3 further comprising: an elastomeric valve forming said valve means having a slit for the passage of said tube and needle therethrough.

Claim 6

The apparatus as claimed in claim 4 in combination with a needle having a connection adapted to being received in said hub and passing through and out of said insertion conduit for penetrating a blood vessel with said insertion conduit therearound.

Claim 7

The apparatus as claimed in claim 4 further comprising: a needle adapted to be used through said insertion conduit having at least one chamfered sloping surface to provide an enlargement of an opening within a blood vessel punctured by said needle.

Claim 8

A biaxial flow device for withdrawing fluid from a blood vessel and simultaneously replacing fluid through a single opening therein comprising: a hub member with an axial passage therethrough; an insertion conduit extending from one end of said hub member adapted for placement within an opening of a blood vessel in connected relationship to and being in communication with said axial passage; a valve member within the axial passage of said hub member configured to provide one way flow through said axial passage; connection means in said hub adapted to receive a needle which can extend in coaxial relationship with and outwardly through said insertion conduit to cause a penetration of a blood vessel, and which needle can be later withdrawn; a biaxial flow insert device for connection to said connection means and through said valve member as a replacement for said needle and having a main conduit and a tubular member; said main conduit being in communication with said insertion conduit and having a passage connected thereto as a branch for outward flow therefrom; and, said tubular member being coaxially implaced in said main conduit in spaced relationship from the inner surface thereof to allow flow therebetween and being connected to a second branch for conducting fluid therethrough and said tubular member extending to or beyond the distal end of said insertion conduit so that fluid can pass simultaneously in and out of a blood vessel through the respective insertion conduit and tubular member.

Claim 9

A biaxial flow device for withdrawing fluid from a blood vessel and simultaneously replacing fluid through a single opening therein comprising: a hub member with an axial passage therethrough; an insertion conduit extending from one end of said hub member adapted for placement within an opening of a blood vessel in connected relationship to and being in communication with said axial passage; a valve member within the axial passage of said hub member configured to provide one way flow through said axial passage; connection means in said hub adapted to receive a needle which can extend in coaxial relationship with and outwardly through said insertion conduit to cause a penetration of a blood vessel, and which needle can be later withdrawn; a biaxial flow insert device for connection to said connection means and through said valve member as a replacement for said needle and having a main conduit and a tubular member; said main conduit being in communication with said insertion conduit and having a passage connected thereto as a branch for outward flow therefrom; and, said tubular member being coaxially implaced in said main conduit in spaced relationship from the inner surface thereof to allow flow therebetween and being connected to a second branch for conducting fluid therethrough and said tubular member extending to or beyond the distal end of said insertion conduit so that fluid can pass simultaneously in and out of a blood vessel through the respective insertion conduit and tubular member.

Claim 10

The apparatus as claimed in claim 7 further comprising: means to connect tubes to the respective branches of said biaxial flow device.

Claim 11

The apparatus as claimed in claim 8 further comprising: a ledge within the axial passage of said hub against which said main conduit of said biaxial flow device is seated to provide a substantially uniform interior surface so that the lumen created thereby will not substantially distort laminar flow of blood therethrough.

Claim 12

The apparatus as claimed in claim 7 further comprising: a valve configured of an elastomeric material and having a slit therethrough which is in the closed position until said tubular member of said biaxial flow device passes therethrough; and, means for securing said valve within the axial passageway.