초록 ▼

A catheter assembly comprises a cannula having proximal and distal end portions and a longitudinal duct having an initial inner cross-section. The duct increases in cross-section when at least a part of the distal end portion of the cannula is inserted into a body of a living subject and maintained

A catheter assembly comprises a cannula having proximal and distal end portions and a longitudinal duct having an initial inner cross-section. The duct increases in cross-section when at least a part of the distal end portion of the cannula is inserted into a body of a living subject and maintained in contact with the body, and/or when the duct is contacted by an aqueous liquid, for a period of time sufficient for an enlarged duct cross-section to form. A hub has a passageway from a first to a second end thereof. The passageway has a cross-sectional area throughout at least substantially equal to 125% of the initial inner cross-section of the duct. A proximal end portion of the cannula is attached to the first end of the hub with a passageway through the hub in flow communication with the duct in the proximal end portion of the cannula. The attaching is such that the cross-section of the duct adjacent the proximal end portion, following formation of the enlarged duct cross-section, is throughout at least substantially equal to the cross-sectional area of the passageway. Increased flow is provided through the hub whereby advantage can be taken of the expansion of the duct.

대표청구항 ▼

A catheter assembly, comprising: a unitary cannula having a proximal end portion, a distal end portion, and a longitudinal duct therethrough from the proximal end portion to the distal end portion, the cannula being of a polymeric material selected such and having the intrinsic property that an inne

A catheter assembly, comprising: a unitary cannula having a proximal end portion, a distal end portion, and a longitudinal duct therethrough from the proximal end portion to the distal end portion, the cannula being of a polymeric material selected such and having the intrinsic property that an inner cross-section of the duct increases to form an enlarged duct cross-section when at least a part of the distal end portion of the cannula is inserted into a body of a living subject and maintained in said body, and/or when the duct is contacted by an aqueous liquid, for a period of time sufficient for the enlarged duct cross-section to form; a hub having a passageway therethrough from a first to a second end thereof, said passageway having a cross-sectional area throughout at least substantially equal to the enlarged duct cross-section; and attaching means for attaching said proximal end portion of said cannula to said first end of said hub with said passageway through said hub in flow communications with said duct in said proximal end portion of said cannula, said attaching being in a manner such that the cross-sectional area of the duct adjacent the proximal end portion, following formation of the enlarged duct cross-section, is throughout at least substantially equal to the enlarged duct cross-section along the remainder of the cannula.