Thoracic drainage device

Claim 1

An apparatus for draining a patient's chest cavity comprising a body including a closed collection chamber having an inlet at the upper end thereof for connection to a patient drainage tube permitting chest cavity fluid and air to drain directly through said inlet to provide direct unobstructed flow of air and fluid into said collection chamber, an air space above the collection chamber, an outlet from the collection chamber in communication with the air space, said body further including a combination negative pressure indicator and air leak detector assembly in turn including a reservoir positioned downstream of said collection chamber and having a liquid trap portion for receipt of an indicator fluid, said reservoir connected to said collection chamber by an upright column positioned intermediate said collection chamber and said reservoir and in turn connected to said outlet at the upper end thereof and to said liquid trap portion at the lower end thereof, and one-way valve seal downstream of the negative pressure indicator and air leak detector assembly acting as a seal to prevent air from entering back into the air leak detector but permitting air from the air leak detector to flow out the valve seal.

Claim 2

An apparatus for draining a patient's chest cavity comprising a body including a closed collection chamber having an inlet at the upper end thereof for connection to a patient drainage tube permitting chest cavity fluid and air to drain directly through said inlet to provide direct unobstructed flow of air and fluid into said collection chamber, an air space above the collection chamber, an outlet from the collection chamber in communication with the air space, said body further including a combination negative pressure indicator and air leak detector assembly in turn including a reservoir positioned downstream of said collection chamber and having a liquid trap portion for receipt of an indicator fluid, said reservoir connected to said collection chamber by an upright column positioned intermediate said collection chamber and said reservoir and in turn connected to said outlet at the upper end thereof and to said liquid trap portion at the lower end thereof, and one-way valve seal downstream of the negative pressure indicator and air leak detector assembly acting as a seal to prevent air from entering back into the air leak detector but permitting air from the air leak detector to flow out the valve seal.

Claim 9

An apparatus for draining a patient's chest cavity comprising a body including a closed collection chamber having an inlet at the upper end thereof for connection to a patient drainage tube permitting chest cavity fluid and air to drain directly through said inlet to provide direct unobstructed flow of air and fluid into said collection chamber, an air space above the collection chamber, an outlet from the collection chamber in communication with the air space, said body further including an air leak detector in turn including a reservoir positioned downstream of said collection chamber and having a liquid trap portion for receipt of an indicator fluid, a first one-way valve seal downstream of the air leak detector acting as a seal to permit air from the air leak detector to escape, yet preventing reverse flow of air from entering the air leak detector, a second one-way valve in parallel air communication with said first one-way valve seal to permit the escape of any positive pressure air within the apparatus directly to atmosphere should positive pressure build up within the apparatus to a level exceeding the opening pressure of the first one-way valve seal, yet prevent any influx of air to enter the apparatus, means downstream of the first one-way valve seal comprising a flow control valve connectable to a source of external suction, said flow control valve being operable to selectively control the level of suction being applied upstream of the one-way valve seal.

Claim 10

An apparatus for draining a patient's chest cavity comprising a body including a closed collection chamber having an inlet at the upper end thereof for connection to a patient drainage tube permitting chest cavity fluid and air to drain directly through said inlet to provide direct unobstructed flow of air and fluid into said collection chamber, an air space above the collection chamber, an outlet from the collection chamber in communication with the air space, said body further including an air leak detector in turn including a reservoir positioned downstream of said collection chamber and having a liquid trap portion for receipt of an indicator fluid, a first one-way valve seal downstream of the air leak detector acting as a seal to permit air from the air leak detector to escape, yet preventing reverse flow of air from entering the air leak detector, a second one-way valve in parallel air communication with said first one-way valve seal to permit the escape of any positive pressure air within the apparatus directly to atmosphere should positive pressure build up within the apparatus to a level exceeding the opening pressure of the first one-way valve seal, yet prevent any influx of air to enter the apparatus, means downstream of the first one-way valve seal comprising a flow control valve connectable to a source of external suction, said flow control valve being operable to selectively control the level of suction being applied upstream of the one-way valve seal.

Claim 17

An apparatus for draining the chest cavity comprising a body including a closed collection chamber having an inlet at the upper end thereof for connection to a patient drainage tube permitting fluid and air to drain directly through said inlet to provide direct, unobstructed flow of air and fluid into said collection chamber, an air space above the collection chamber, an outlet from the collection chamber in communication with the air space, said body further including an air leak detector in turn including a reservoir positioned downstream of said collection chamber and having a liquid trap portion for receipt of an indicator fluid, said air leak detector downstream of and in air communication with said outlet, means provided in the reservoir to prevent spilling or loss of detector liquid when the apparatus is tilted such that indicator liquid returns to the reservoir once the apparatus is righted to its original pretilt position, an air space above the reservoir, a second outlet from said air space, two one-way valves positioned downstream of said outlet and in air communication with said second outlet, one of said valves acting as a one-way seal to permit air from said air leak detector to escape yet prevent reverse flow of air from entering the air space above the air leak detector, said second valve in parallel air communication with the first one-way valve seal to permit the escape of any positive pressure from the air space outlet to exit directly to atmosphere yet prevent any influx of air to enter the air space, both valves opening at less than about 10 cm H 2 O pressure, means downstream of the first one-way valve seal comprising a flow control valve connectable to a source of external suction, said flow control valve being operable to selectively control the level of suction being applied upstream of both said one-way valves.

Claim 18

An apparatus for draining the chest cavity comprising a body including a closed collection chamber having an inlet at the upper end thereof for connection to a patient drainage tube permitting fluid and air to drain directly through said inlet to provide direct, unobstructed flow of air and fluid into said collection chamber, an air space above the collection chamber, an outlet from the collection chamber in communication with the air space, said body further including an air leak detector in turn including a reservoir positioned downstream of said collection chamber and having a liquid trap portion for receipt of an indicator fluid, said air leak detector downstream of and in air communication with said outlet, means provided in the reservoir to prevent spilling or loss of detector liquid when the apparatus is tilted such that indicator liquid returns to the reservoir once the apparatus is righted to its original pretilt position, an air space above the reservoir, a second outlet from said air space, two one-way valves positioned downstream of said outlet and in air communication with said second outlet, one of said valves acting as a one-way seal to permit air from said air leak detector to escape yet prevent reverse flow of air from entering the air space above the air leak detector, said second valve in parallel air communication with the first one-way valve seal to permit the escape of any positive pressure from the air space outlet to exit directly to atmosphere yet prevent any influx of air to enter the air space, both valves opening at less than about 10 cm H 2 O pressure, means downstream of the first one-way valve seal comprising a flow control valve connectable to a source of external suction, said flow control valve being operable to selectively control the level of suction being applied upstream of both said one-way valves.