Fluid injection device for intravenous delivery system

A fluid injection apparatus for use with an intravenous delivery set and adapted for connection to a fluid source by means of an elongated injection probe having a relatively blunt end, comprising:

• means in said delivery set defining an access port for injection of a fluid;
• a resilient, compressible closure element for sealing said access port and having a thin, elongated passage formed therethrough, said element having a normal uncompressed condition and a sealing condition wherein said element is tightly pressed into said access port to compress said element sufficiently to close said passage and seal said access port;
• said closure element having a generally cylindrical shape and a rearwardly extending cylindrical wall that is adapted to be flexed radially outwardly and folded forwardly over an end portion of the means defining the access port;
• and
• a cap adapted to be tightly received over the folded end portion of said closure elements and secured thereon, said cap having an end wall with a central opening therein adapted to receive and guide said injection probe;
• whereby said probe may be forced through said axial passage when said element is in its sealing condition to permit injection of a fluid therethrough into said delivery set.