Connecting devices for catheters, perfusion equipment and systems for perfusing or draining liquids in the human body

A connecting device for catheters, perfusion equipment and systems for perfusing liquids to the human body, comprising an assembly of two external enveloping elements, open at one end by which they can be coupled to one another so as to slide to a reasonable holding position of said enveloping elements, which enveloping elements have, at the opposing ends, respective connections which are specific or adapted to existing catheters to enable them to communicate with a container or containers containing the liquids to be perfused and a connection for the element for perfusion to the patient, said enveloping elements also having, in their interior, couplable internal tubular elements intended to allow passage of liquid to be perfused from an inlet conduit to an outlet conduit communicating with a catheter or other perfusion device, with an arrangement of sealing means between the internal tubular elements and external enveloping elements to prevent the admission of contaminants originating from the surrounding environment, wherein a radial separation is formed between the external enveloping elements forming the connection, which is greater than that required to allow the displacement by capillary action of the liquid to be perfused and forms an intermediate chamber disposed in a path of passage of air from the exterior to the interior of the connection, and wherein one of the external enveloping elements has an air inlet with an anti-bacterial filter formed therein.