Central catheters, assemblies, and methods thereof

A central catheter, comprising:

• a catheter tube configured for advancement along a vasculature of a patient, the catheter tube including a number of catheter-tube lumens extending along the catheter tube, wherein the catheter tube defines a first section having a first diameter, a second section proximal the first section having a second diameter greater than the first diameter, and a third section proximal the second section and having a third diameter greater than the second diameter, and wherein the catheter tube further defines a first tapered portion between the first section and the second section and a second tapered portion between the second section and the third section;
• a needle side port disposed on the second tapered portion, the needle side port extending through a side wall of the catheter tube in fluid communication with one of the number of catheter-tube lumens;
• a number of extension legs equal to the number of catheter-tube lumens, wherein each extension leg of the number of extension legs is in fluid communication with a corresponding catheter-tube lumen of the number of catheter-tube lumens;
• and
• a needle hub coupled with the catheter tube, including:
• a needle-hub lumen configured for advancement of a needle therethrough, wherein the needle-hub lumen is parallel with the catheter tube along a distal portion of the needle hub;
• and
• a septum disposed across a proximal portion of the needle-hub lumen, the septum configured to:
• define a fluid tight seal with the needle when the needle is disposed within the needle-hub lumen, and
• prevent fluid flow through the proximal portion of the needle-hub lumen when the needle is not disposed within the needle-hub lumen;
• and
• wherein the needle hub is coupled with the catheter tube such that the needle-hub lumen is in fluid communication with one of the number of catheter-tube lumens through the needle side port.