초록 ▼

A continuous length of flexible polymeric tubing having a smooth fissureless inner surface throughout is provided with a region intermediate its ends which region has an inside diameter greater than the inside diameter of the remainder of said tubing and a thinner wall than that of the remainder of

A continuous length of flexible polymeric tubing having a smooth fissureless inner surface throughout is provided with a region intermediate its ends which region has an inside diameter greater than the inside diameter of the remainder of said tubing and a thinner wall than that of the remainder of said tubing with a gradual transition in wall thickness and diameter therebetween. A rigid walled enclosure surrounds said region of the tubing with a slight clearance therebetween except at the ends of the enclosure which encircle the tubing beyond said region with a snug fit. A duct is joined to the enclosure near one end for feeding fluid under pressure thereto. Various arrangements of over-pressure relief prevent pinching of the tubing while affording controlled indentation thereof. The transition section of the tubing wall can cooperate with a port in the enclosure to afford said overpressure relief. Portions of the tubing wall may be thickened (i.e., strengthened) or attached to the enclosure to limit indentation.

대표청구항 ▼

A blood pulsating and/or pumping device for use in procedures involving transporting blood between two cannulae inserted in the body comprising a one-piece continuous length of blood compatible flexible polymeric tubing having a smooth inner surface which minimizes blood trauma throughout and includ

A blood pulsating and/or pumping device for use in procedures involving transporting blood between two cannulae inserted in the body comprising a one-piece continuous length of blood compatible flexible polymeric tubing having a smooth inner surface which minimizes blood trauma throughout and including a normal first inside diameter, and a region intermediate the ends of said tubing formed by permanent expansion to have an expanded second inside diameter greater than said normal first inside diameter of the remainder of said tubing and a thinner wall than that of the remainder of said tubing with a gradual transition in wall thickness and diameter therebetween, a walled enclosure more rigid than said tubing region surrounding said region of said tubing with a clearance therebetween except at the ends of said enclosure which encircle said tubing beyond said region with a snug fit, and duct means joined to said enclosure for interconnecting the space between said enclosure and said tubing region with a driving unit for controlling the supply thereto and withdrawal therefrom of pressurizing fluid.