Coupling apparatus for infusion device

A system for controlling flow of liquids to and from a patient via a syringe, comprising:

• a valve assembly comprising a male luer lock fitting and a flow control valve;
• and
• a coupling apparatus configured to connect to the syringe, comprising:
• an inlet, a first gland, a cannula, a second gland, and a coupler,
• said inlet comprising an inlet flange defining an inlet lumen, wherein the first gland, the cannula, and a proximal segment of the second gland are all received within the inlet lumen, the cannula being displaceable therein;
• said first gland comprising a distal section and a proximal section, wherein the distal section operatively engages a proximal extension of the cannula, and the proximal section operatively engages the inlet;
• said second gland comprising a distal segment and the proximal segment, wherein the distal segment operatively engages a proximal flange of the coupler, and the proximal segment operatively engages a distal extension of the cannula,
• wherein the distal segment comprises a distal cannula lumen receiving the distal extension of the cannula therein, thereby defining an unaltered straight fluid path from a central lumen defined within the cannula, through the second gland, and to the coupler, and
• wherein the unaltered straight fluid path exists prior to, during, and after connection of the coupling apparatus to the syringe;
• and
• said coupler comprises a distal flange and the proximal flange, wherein the distal flange is mechanically coupled to the male luer lock fitting, and the proximal flange is mechanically coupled to the inlet.

An infusion device configured to connect a syringe to a patient via a valve assembly, said infusion device comprising:

• an inlet, a compressible first gland, a displaceable cannula defining a central lumen therein, a compressible second gland, and a coupler,
• said first gland, said displaceable cannula, and said second gland are all received within a proximal flange of the coupler and within the inlet,
• wherein the displaceable cannula is distally displaced upon compression of the first gland,
• said inlet providing a rigid structure for limiting lateral displacement of the first gland when compressed,
• said displaceable cannula is received by the first gland and the second gland, the displaceable cannula comprising a distal extension extending into a distal cannula lumen defined within the second gland,
• wherein reception of the distal extension of the displaceable cannula into the distal cannula lumen defines an unaltered straight fluid path from the central lumen of the displaceable cannula, through the second gland, and to the coupler, and
• wherein the unaltered straight fluid path exists prior to, during, and after connection of the infusion device to the syringe, and
• said proximal flange of the coupler mechanically engages the inlet and the second gland.