Closed drainage system with double lumen tube

Claim 2

A closed system for drainage of liquid from a cavity comprising a tubular conduit having a single liquid inlet opening insertable into the cavity and a downwardly extending section, a drainage receptacle in a position to receive liquid from said conduit, the downwardly extending section including a drainage tube having two lumens which are in communication at the upstream end of the tube and adjacent the downstream end of the tube, oneway valve means adjacent the upstream end of one of said lumens for permitting the passage of liquid into the one lumen, said valve means comprising a flap valve.

Claim 3

A closed system for drainage of liquid from a body cavity comprising a tubular conduit having a single liquid inlet opening insertable into the cavity and a downwardly extending section, and a drainage receptacle in a position to receive liquid from said conduit, the downwardly extending section including a drainage tube having two lumens which are in communication at the upstream end of the tube and adjacent the downstream end of the tube, said drainage tube including a section defining a portion of one of said lumens which extends upstream from the other of the lumens, said section having a plurality of apertures disposed circumferentially around the section, and including a filter covering said apertures, said filter being pervious to air to permit passage of air between the lumens to alleviate negative or positive pressure in said one lumen and impervious to liquid to prevent passage of liquid from the one lumen.

Claim 4

A closed system for drainage of liquid from a body cavity comprising a tubular conduit having a single liquid inlet opening insertable into the cavity and a downwardly extending section, and a drainage receptacle in a position to receive liquid from said conduit, the downwardly extending section including a drainage tube having two lumens which are in communication at the upstream end of the tube and adjacent the downstream end of the tube, said drainage tube including a section defining a portion of one of said lumens which extends upstream from the other of the lumens, said section having a plurality of apertures disposed circumferentially around the section, and including a filter covering said apertures, said filter being pervious to air to permit passage of air between the lumens to alleviate negative or positive pressure in said one lumen and impervious to liquid to prevent passage of liquid from the one lumen.

Claim 5

In a closed system for draining liquid from a body cavity, including a catheter having a drainage eye adjacent its distal end and a drainage lumen extending from the drainage eye to the proximal end of the catheter, and a drainage receptacle for collecting the liquid, a drainage tube having a pair of lumens which are in communication adjacent the upstream and downstream end of the tube, with said lumens communicating with the drainage lumen of the catheter adjacent the upstream end of the tube and communicating with the drainage receptacle adjacent the downstream end of the tube to drain liquid from the catheter to the drainage receptacle and alleviate negative pressure developed in the system, one-way valve means adjacent the upstream end of one of said lumens for permitting the passage of Air from the one lumen into the other of said lumens and preventing the passage of liquid into the one lumen, said valve means comprising a flap valve.

Claim 6

In a closed system for draining liquid from a body cavity, including a catheter having a drainage eye adjacent its distal end and a drainage lumen extending from the drainage eye to the proximal end of the catheter, and a drainage receptacle for collecting the liquid, a drainage tube having a pair of lumens which are in communication adjacent the upstream and downstream end of the tube, with said lumens communicating with the drainage lumen of the catheter adjacent the upstream end of the tube and communicating with the drainage receptacle adjacent the downstream end of the tube to drain liquid from the catheter to the drainage receptacle and alleviate negative pressure developed in the system, one-way valve means adjacent the upstream end of one of said lumens for permitting the passage of Air from the one lumen into the other of said lumens and preventing the passage of liquid into the one lumen, said valve means comprising a flap valve.

Claim 7

In a closed system for draining liquid from a body cavity, including a catheter having a drainage eye adjacent its distal end and a drainage lumen extending from the drainage eye to the proximal end of the catheter, and a drainage receptacle for collecting the liquid, a drainage tube having a pair of lumens which are in communication adjacent the upstream and downstream end of the tube, with said lumens communicating with the drainage lumen of the catheter adjacent the upstream end of the tube and communicating with the drainage receptacle adjacent the downstream end of the tube to drain liquid from the catheter to the drainage receptacle and alleviate negative pressure developed in the system, said drainage tube including a section defining a portion of one of said lumens which extends upstream from the other of the lumens, said section having a plurality of apertures disposed circumferentially around the section, and including a filter covering said apertures, said filter being pervious to air to permit passage of air between the lumens and impervious to liquid to prevent passage of liquid from the one lumen.

Claim 8

In a closed system for draining liquid from a body cavity, including a catheter having a drainage eye adjacent its distal end and a drainage lumen extending from the drainage eye to the proximal end of the catheter, and a drainage receptacle for collecting the liquid, a drainage tube having a pair of lumens which are in communication adjacent the upstream and downstream end of the tube, with said lumens communicating with the drainage lumen of the catheter adjacent the upstream end of the tube and communicating with the drainage receptacle adjacent the downstream end of the tube to drain liquid from the catheter to the drainage receptacle and alleviate negative pressure developed in the system, said drainage tube including a section defining a portion of one of said lumens which extends upstream from the other of the lumens, said section having a plurality of apertures disposed circumferentially around the section, and including a filter covering said apertures, said filter being pervious to air to permit passage of air between the lumens and impervious to liquid to prevent passage of liquid from the one lumen.

Claim 9

The drainage system of claim 4 including a connector which closes the upstream end of said tube, said connector having a passageway to receive an end portion of the tube section and communicating between the lumen extension and the drainage lumen of the catheter.