Surgical drainage apparatus

Claim 2

A surgical pleural drainage device for draining fluids from the body of a patient comprising a container, a collection chamber for fluids formed in said container, a fluid inlet extending from outside said container into the upper end of said collection chamber to provide an unobstructed passageway for the free flow of both liquids and gases from the body of a patient into the collection chamber, connection means for connecting said collection chamber to a source of negative pressure to create a negative pressure within said collection chamber and thereby draw fluids into said collection chamber through said fluid inlet, said connection means including a suction outlet mounted on said container to which the source of negative pressure is applied and a passageway disposed adjacent the upper end of the container connecting said suction outlet and said collection chamber, one way resiliently operated valve means provided in said fluid passageway for allowing gases to flow from said collection chamber to said suction outlet and preventing reverse flow of gases from said suction outlet to said collection chamber, trap means for preventing liquid from said collection chamber from passing through said one way valve means, and control means provided in said passageway for controlling the amount of negative pressure applied to said collection chamber relative to the negative pressure applied at said suction outlet.

Claim 3

A pleural drainage apparatus as claimed in claim 1 wherein said one-way valve means includes two one-way valves arranged in series which serve as redundant valves to allow fluid flow in one direction only and to prevent fluid flow in the reverse direction.

Claim 4

A pleural drainage apparatus as claimed in claim 1 and further including an air leak indicating means provided in said passageway for indicating the flow of gases through said passageway.

Claim 5

A pleural drainage apparatus as claimed in claim 3 wherein said air leak indicating means includes a visible liquid trap through which the gases flow and therein form bubbles, which bubbles serves as visible indicators of flow.

Claim 6

A pleural drainage apparatus as claimed in claim 4 wherein said liquid trap is filled with a liquid of high vapor pressure to decrease evaporation.

Claim 7

A pleural drainage apparatus as claimed in claim 4 wherein said air leak indicating means further includes a measuring means for quantitatively measuring the flow of gases through said passageway.

Claim 8

A pleural drainage apparatus as claimed in claim 4 wherein said visible liquid trap includes a flow preventing means for preventing the liquid in said liquid trap from entering said passageway.

Claim 9

A pleural drainage apparatus as claimed in claim 7 wherein said visible liquid trap includes an enclosed chamber, a wall which divides said chamber into an inlet side and an outlet side, and an aperture provided in said wall adjacent a lower end of said wall which provides fluid communication between said inlet side and said outlet side; and wherein said flow preventing means includes a passageway inlet tube and a passageway outlet tube which form a portion of said passageway and which extends respectively into the inlet side and outlet side of said chamber, said chamber and said dividing wall having a size such that the end of said passageway inlet tube and the end of said passageway outlet tube in said chamber are spaced from the boundaries of said chamber and of said dividing wall in all directions by a distance which is greater than the height attained by the liquid in said chamber no matter in which direction said chamber is oriented so that the liquid does not flow into either said passageway inlet tube or said passageway outlet tube no matter in what direction said drainage apparatus is oriented.

Claim 10

A pleural drainage apparatus as claimed in claim 8 wherein said outlet side also includes baffle plates therein between said passageway outlet tube and said aperture.

Claim 11

A pleural drainage apparatus as claimed in claim 8 wherein said outlet side also includes baffle plates therein between said passageway outlet tube and said aperture.

Claim 12

A pleural drainage apparatus as claimed in claim 1 and further including an excess negative pressure relief means for relieving excess negative pressure in said collection chamber.

Claim 13

A pleural drainage apparatus as claimed in claim 11 wherein said excess negative pressure relief means includes a means for admitting atmospheric air into said collection chamber to relieve the excess negative pressure.

Claim 14

A pleural drainage apparatus as claimed in claim 12 wherein said excess negative pressure relief means further includes a relief one-way valve means for admitting air only from atmosphere to said collection chamber, an isolating valve means for preventing any flow of atmospheric air through said relief one-way valve means, and an actuating means for said isolating valve means which is selectively operated by the user for opening said isolating valve means and permitting the flow of atmospheric air through said relief one-way valve means.

Claim 15

A pleural drainage apparatus as claimed in claim 13 wherein said relief one-way valve means is biased to close when the negative pressure in said collection chamber reaches a predetermined value such that the negative pressure in said collection chamber is not reduced below this value by the continued operation of said actuating means.

Claim 16

A pleural drainage apparatus as claimed in claim 12 wherein said excess negative pressure relief means further includes a filter through which the atmospheric air passes.

Claim 17

A pleural drainage apparatus as claimed in claim 11 and further including a positive pressure relief means for relieving excess positive pressure in said collection chamber.

Claim 18

A pleural drainage apparatus as claimed in claim 16 wherein said positive pressure relief means includes a resiliently biased automatic one-way valve which allows fluid flow only from said collection chamber to atmosphere and which opens automatically whenever a positive pressure exists in said collection chamber.

Claim 19

A pleural drainage apparatus as claimed in claim 17 wherein said automatic one-way valve includes an inlet which is connected to said passageway.

Claim 20

A pleural drainage apparatus as claimed in claim 18 wherein said automatic one-way valve further includes an outlet which is located inside of said container in a chamber which is vented to atmosphere.

Claim 21

A pleural drainage apparatus as claimed in claim 1 and further including a pressure measuring means for measuring the negative pressure in said passageway.

Claim 22

A pleural drainage apparatus as claimed in claim 20 wherein said pressure measuring means inlcudes indicia which indicates a desired value of the measured source of negative pressure such that the value of the source of negative pressure is adjusted to the desired value.

Claim 23

A pleural drainage apparatus as claimed in claim 21 wherein said pressure measuring means includes a vertically disposed column; a straight bore extending vertically through said column and opening upwardly, said bore having a lower end which is vented to atmosphere and an upper end which is vented to the source of suction; a slot adjoining said bore which has an increasing lateral cross section from said lower end to said upper end; and a ball disposed in said bore which floats along the length of said bore at a position along said bore dependent on the volume of air drawn through said lower end and out of said upper end whereby the position of said ball along the length of said bore serves as an indication of the value of the source of negative pressure.

Claim 24

A pleural drainage apparatus as claimed in claim 1 wherein said control means includes a fine pressure adjusting means for finely adjusting the pressure in said collection chamber including a first chamber having a resiliently biased fine one-way valve disposed therein so as to divide said first chamber into a vent side which is vented to atmosphere and a suction side which forms a portion of said passageway, said fine one-way valve permitting fluid flow only from said vent side to said suction side when the negative pressure in said passageway exceeds a desired value; said control means also including a gross pressure adjusting means for grossly adjusting the pressure in said collection chamber including a second chamber having a resiliently biased gross one-way valve disposed therein so as to divide said second chamber into a vent side which is vented to atmosphere and a suction side forming a portion of said passageway downstream of said suction side of said first chamber and connected to said suction side of said first chamber though a restricted opening, said gross one-way valve of said second chamber permitting fluid flow only from said vent side to said suction side when the negative pressure in said suction side exceeds a value somewhat greater than the desired value for said passageway.

Claim 25

A pleural drainage apparatus as claimed in claim 23 wherein said suction side of said second chamber is connected directly to said suction outlet and further including a restrictor in said suction outlet whereby the negative pressure applied by the source of negative pressure to said suction side of said second chamber is reduced by said restrictor.

Claim 26

A pleural drainage apparatus as claimed in claim 1 and further including a dynamic pressure measuring means for measuring excess negative pressure in the collection chamber and for measuring the changes in pressure in said collection chamber and hence the changes in pressure in said collection chamber as the patient breathes.

Claim 27

A pleural drainage apparatus as claimed in claim 25 wherein said dynamic pressure measuring means includes a bellows whose interior region is fluidly connected to said collection chamber and whose exterior region is fluidly connected to said passageway such that variations in the pressure in said collection chamber cause said bellows to expand and contract.

Claim 28

A pleural drainage apparatus as claimed in claim 1 wherein said control means includes a suction varying means for varying the amount of negative pressure applied to said collection chamber relative to the negative pressure applied at said suction outlet.

Claim 29

A pleural drainage apparatus as claimed in claim 27 wherein said suction varying means includes a plurality of resiliently biased value means arranged in a series with the first of said valve means having an inlet which is vented to atmosphere and the rest of said valve means having an inlet which communicates with an outlet of the preceeding said valve means, each said valve means further including a passage from a respective said outlet to said suction outlet; and a valve selector for fluidly connecting one of said respective said outlets with said suction outlet whereby said outlet selected by said selector determines the rate of flow of bleed air to said suction outlet and hence the amount of negative pressure which is applied to said collection chamber.

Claim 30

A surgical pleural drainage device for draining fluids from the body of a patient comprising: a container, a collection chamber for fluids formed in said container, a fluid inlet extending from outside said container into the upper end of said collection chamber to provide an unobstructed passageway for the free flow of both liquids and gases from the body of a patient into the collection chamber, connection means for connecting said collection chamber to a source of negative pressure to create a negative pressure within said collection chamber and thereby draw fluids into said collection chamber through said fluid inlet, said connection means including a suction outlet mounted on said container to which the source of negative pressure is applied and a passageway disposed adjacent the upper end of the container connecting said suction outlet and said collection chamber, one way resiliently operated valve means provided in said fluid passageway for allowing gases to flow from said collection chamber to said suction outlet and preventing reverse flow of gases from said suction outlet to said collection chamber, trap means for preventing liquid from said collection chamber from passing through said one way valve means, control means provided in said passageway for controlling the amount of negative pressure applied to said collection chamber relative to the negative pressure applied at said suction outlet, an air leak indicating means provided in said passageway for indicating the flow of gases through said passageway including a visible liquid trap through which the gases flow and therein form bubbles, which bubbles serve as visible indicators of flow, and an excess negative pressure relief means for relieving excess negative pressure in said collection chamber which cannot relieve the negative pressure down to atmospheric pressure.

Claim 31

A surgical pleural drainage device for draining fluids from the body of a patient comprising: a container, a collection chamber for fluids formed in said container, a fluid inlet extending from outside said container into the upper end of said collection chamber to provide an unobstructed passageway for the free flow of both liquids and gases from the body of a patient into the collection chamber, connection means for connecting said collection chamber to a source of negative pressure to create a negative pressure within said collection chamber and thereby draw fluids into said collection chamber through said fluid inlet, said connection means including a suction outlet mounted on said container to which the source of negative pressure is applied and a passageway disposed adjacent the upper end of the container connecting said suction outlet and said collection chamber, one way resiliently operated valve means provided in said fluid passageway for allowing gases to flow from said collection chamber to said suction outlet and preventing reverse flow of gases from said suction outlet to said collection chamber, trap means for preventing liquid from said collection chamber from passing through said one way valve means, control means provided in said passageway for controlling the amount of negative pressure applied to said collection chamber relative to the negative pressure applied at said suction outlet, an air leak indicating means provided in said passageway for indicating the flow of gases through said passageway including a visible liquid trap through which the gases flow and therein form bubbles, which bubbles serve as visible indicators of flow, and an excess negative pressure relief means for relieving excess negative pressure in said collection chamber which cannot relieve the negative pressure down to atmospheric pressure.

Claim 32

A pleural drainage apparatus as claimed in claim 29 and further including a positive pressure relief means for relieving excess positive pressure in said collection chamber.

Claim 33

A pleural drainage apparatus as claimed in claim 30 and further including a pressure measuring means for measuring the negative pressure in said passageway.

Claim 34

A pleural drainage apparatus as claimed in claim 31 and further including a dynamic pressure measuring means for measuring the pressure in said collection chamber and hence the changes in pressure in said collection chamber as the patient breathes.

Claim 35

A pleural drainage apparatus as claimed in claim 32 wherein said control means includes a suction varying means for varying the amount of negative pressure applied to said collection chamber relative to the negative pressure applied at said suction outlet.

Claim 36

A pleural drainage apparatus as claimed in claim 32 wherein said control means includes a fine pressure adjusting means for finely adjusting the pressure in said collection chamber including a first chamber having a resiliently biased fine one-way valve disposed therein so as to divide said first chamber into a vent side which is vented to atmosphere and a suction side which forms a portion of said passageway, said fine one-way valve permitting fluid flow only from said vent side to said suction side when the negative pressure in said passageway exceeds a desired value; said control means also including a gross pressure adjusting means for grossly adjusting the pressure in said collection chamber including a second chamber having a resiliently biased gross one-way valve disposed therein so as to divide said second chamber into a vent side which is vented to atmosphere and a suction side forming a portion of said passageway downstream of said suction side of said first chamber and connected to said suction side of said first chamber through a restricted opening, said gross one-way valve of said second chamber permitting fluid flow only from said vent side to said suction side when the negative pressure in said suction side exceeds a value somewhat greater than the desired value for said passageway.

Claim 37

A pleural drainage apparatus as claimed in claim 34 wherein said suction side of said second chamber is connected directly to said suction outlet and further including a resistor in said suction outlet whereby the negative pressure applied by the source of negative pressure to said suction side of said second chamber is reduced by said restrictor.

Claim 38

A pleural drainage apparatus as claimed in claim 35 wherein said air leak indicating means further includes a measuring means for quantitatively measuring the flow of gases through said passageway.

Claim 39

A pleural drainage apparatus as claimed in claim 35 wherein said visible liquid trap includes a flow preventing means for preventing the liquid in said liquid trap from entering said passageway.

Claim 40

A pleural drainage apparatus as claimed in claim 37 wherein said visible liquid trap includes an enclosed chamber, a wall which divides said chamber into an inlet side and an outlet side, and an aperture provided in said wall adjacent a lower end of said wall which provides fluid communication between said inlet side and said outlet side; and wherein said flow preventing means includes a passageway inlet tube and a passageway outlet tube which form a portion of said passageway and which extend respectively into the inlet side and outlet side of said chamber, said chamber and said dividing wall having a size such that the end of said passageway inlet tube and the end of said passageway outlet tube in said chamber are spaced from the boundaries of said chamber and of said dividing wall in all directions by a distance which is greater than the height attained by the liquid in said chamber no matter in which direction said chamber is oriented so that the liquid does not flow into either said passageway inlet tube or said passageway outlet tube no matter in what direction said drainage apparatus is oriented.

Claim 41

A surgical pleural drainage apparatus for draining fluids from the body of a patient comprising: a container; a collection chamber having an upper end formed in said container; a fluid inlet extending from outside said container into the upper end of said collection chamber to provide an unobstructed passageway for the free flow of body liquids and gases from the body of a patient into the collection chamber; a suction outlet in said container which is connected to a source of negative pressure; a passageway which connects said suction outlet to said collection chamber; and a dynamic pressure measuring means for measuring the difference in pressure between the pressure in said collction chamber and the pressure in the passageway connecting the collection chamber and said suction outlet whereby the pressure measuring means measures the changes in pressure in said collection chamber due to the breathing of the patient.

Claim 42

A surgical pleural drainage apparatus for draining fluids from the body of a patient comprising: a container; a collection chamber having an upper end formed in said container; a fluid inlet extending from outside said container into the upper end of said collection chamber to provide an unobstructed passageway for the free flow of body liquids and gases from the body of a patient into the collection chamber; a suction outlet in said container which is connected to a source of negative pressure; a passageway which connects said suction outlet to said collection chamber; and a dynamic pressure measuring means for measuring the difference in pressure between the pressure in said collction chamber and the pressure in the passageway connecting the collection chamber and said suction outlet whereby the pressure measuring means measures the changes in pressure in said collection chamber due to the breathing of the patient.

Claim 43

A surgical drainage apparatus as claimed in claim 39 wherein said pressure measuring means includes a movable member having two sides, one side which is subject to the pressure in said collection chamber and fluid inlet and the other side which is subject to the pressure in said passageway.

Claim 44

A surgical drainage apparatus as claimed in claim 40 wherein said movable member having two sides is a bellows having an inside and an outside.

Claim 45

A surgical drainage apparatus as claimed in claim 40 and further including a one-way valve means for allowing fluid flow from said collection chamber to said suction outlet only, said one-way valve means being provided in said passageway upstream side of said movable member which is subject to the pressure in said passageway.