US3593765A - Drainage bag - Google Patents

Abstract

A bag for use in a closed urinary drainage system in which one wall of the bag is faced inwardly with a thin liner sealed to said wall around its entire periphery, the space between the liner and the second wall of the bag being in communication with the drainage tube and unvented while the space between the liner and the first wall is freely vented to atmosphere.

Description

United States Patent Martin Moaeatere, Jr.

Lebanon;

Vincent L. Valllaleonrt Llringloa, both 0!, NJ.

July 8, 1969 July 20, 197! C. I. lard. he.

Murray Hill, NJ.

Inventors Appl. No. Filed Patented Assignee 1111111141101: no 4 Claims, 4 Drawing F1 11s. (:1. 150/1, l28/275, l28/DIG. 24 1111. (:1 use 31/00 Field 0! Search 150/1, 8; 128/275, 010. 24; 229/53, 56; 222/94 [56] leteraloas Clad UNITED STATES PATENTS 2,930,423 3/l960 Cunningham 222/94 300L565 9ll96l Beach ISO/l 3,l 70,600 2/ I965 Pierson.... 222/94 3,4l5,299 1211968 Hinlnan ISO/l X Primary WW F. Norton Attorney-W. Saxton Seward ABSTRACT: A bag for nae in a closed urinary drainage system in which one wall of the bag is faced inwardly with a thin liner sealed to said wall around its entire periphery, the space between the liner and the second wall of the bag being in communication with the drainage tube and unvented while the space between the liner ad the flr'ltvall is freely vented to atmosphere.

PATENTED JUL 20 I971 HV VIL N'IUR S MARTIN MONESTERE,Jr. BY v. L. VAlLLANCOUR Ila-6Q Mu? float ATTORNEYS (PRIOR ART) DRAINAGE BAG In the design of closed system drainage bags, an important requirement is to obtain a system in which the air space above the accumulating liquid is maintained at all stages at atmospheric pressure. This condition should, ideally, be attained without allowing entry of outside air. Commercially, however, it has been considered essential to compromise either by completely sealing off the bag (regardless of pressure variations), or by providing a vent near the top of the bag to maintain atmospheric pressure in the bag during filling. Such vents contain wads of cotton, rayon or other material, as a filter, and suffer from the disadvantage that, once the filter is wetted, it presents a high resistance to air flow and prevents the vent from functioning properly. A vented bag of the type just described is shown, for instance, in Government U.S. Pat. No. 3,3I2,22l.

An object of the present invention is to provide a closed drainage bag, having no vent, but in which the pressure above the accumulating liquid is atmospheric, this result being at tained by the use of a diaphragm on one wall of the bag, one side of the diaphragm being open to the atmosphere.

A practical embodiment of the invention is shown in the accompanying drawing, wherein:

FIG. I represents a rear elevation of a drainage bag with drip chamber inlet and bottom outlet;

FIGS. 2 and 3 represent vertical sections on the line ll-Il of FIG. I showing difierent stages of bag filling, and

FIG. 4 represents a vertical section of a closed nonvented bag, to illustrate the creation of adverse presure conditions which are overcome by the use of the present invention.

Referring to the drawing, the bag I is of customary form, having front and back walls, 2, 3 of clear flexible plastic (e.g., 0.012 inch vinyl), an inlet opening in which is sealed the lower end of a drip chamber 4, with drainage tube 5 connected to the upper end of the chamber, and bottom outlet tube 6 closed by a clamp 7. The walls 2, 3 are sealed together peripherally with provision at the top for an open sleeve 8 to which a suitable support may be attached as shown, for instance, in Serany et al. u.S. Pat. No. 3,37 l ,897.

An inner liner 9, which may be a sheet of 0.00] inch vinyl, is sealed to the lower part of the backwall 3 along the line 10, and to the upper part of the backwall 3 along the line I], and has its vertical edges sealed in the side seams l2, 13 between the edges of the walls 2 and 3. Just below the line II the wall 3 is provided with an opening or vent I4 so that the space, if any, between the wall 3 and liner 9 is in open communication with the atmosphere. Additional vents may be provided, if desired.

To explain the operation of the improved bag of FIGS. l to 3, reference is made first to FIG. 4, showing a nonvented bag IS in which the liquid 16 has risen to the level 11, above which the space I contains whatever air may have been introduced when the system as initially installed or subsequently. The liquid I distends the lower part of the bag, but the limited quantity of air in the space ll does not permit expansion of the upper part to the "teardrop" profile which would be assumed by a vented bag; the upper parts of the walls, in trying to expand, reduce the air pressure in the space below below atmospheric and this negative pressure is communicated through the system to the patient, with adverse effects.

In the bag I of FIGS. l, 1 and 3, a quantity of liquid I9 distends the lower parts at the walls 2 and 3, as in FIG. 4, but the upper parts of the walls lie in positions of equilibrium, the air above the liquid in space 2. being maintained at substantially atmospheric pressure as the thin liner 9 moves readily to a position spaced from the wall 3, with air at atmospheric pressure flowing into the space 2| through the vent I.

When the liquid reaches the level indicated in FIG. 3, the space 2] hasbeen reduced to zero and the bag should be emptied to prevent the premure in space 20 from rising to a point here drainage would be interfered with.

It the bag is of substantially rectangular form (rather than shaped at the bottom to improve drainage and/or provided with the sleeve I or the like for suspension) the upper and/or lower edges of the liner could, if desired, be sealed to the upper and/or lower edges of the walls, as in the case of the side edges I2, l3. A simple rectangular bag is shown in Garth US. Pat. No. 3,2l7,770.

What we claim is:

I. A drainage bag comprising from and back vertical walls of flexible liquid impermeable plastic material peripherally sealed together, an inlet opening adjacent the upper edge of said walls and an inner liner of flexible liquidimperrneable plastic material sealed throughout its periphery to the inner surface of one of said walls said liner and covering at least a major portion of said surface, said one wall being provided with a vent within the bounds of said major portion.

2. A drainage bag according to claim I in which the liner is substantially rectangular and has its upper and lower edges sealed to said one wall along lines adjacent to but spaced from the upper and lower edges of said walls respectively.

3. A drainage bag according to claim 2 in which the side edges of the liner are sealed between the side edges of said walls.

4. A drainage bag according to claim I in which the thickness of the liner is a small fraction of the thickness of the walls.

Claims (4)

1. A drainage bag comprising front and back vertical walls of flexible liquid impermeable plastic material peripherally sealed together, an inlet opening adjacent the upper edge of said walls and an inner liner of flexible liquid impermeable plastic material sealed throughout its periphery to the inner surface of one of said walls said liner and covering at least a major portion of said surface, said one wall being provided with a vent within the bounds of said major portion.

2. A drainage bag according to claim 1 in which the liner is substantially rectangular and has its upper and lower edges sealed to said one wall along lines adjacent to but spaced from the upper and lower edges of said walls respectively.

3. A drainage bag according to claim 2 in which the side edges of the liner are sealed between the side edges of said walls.

4. A drainage bag according to claim 1 in which the thickness of the liner is a small fraction of the thickness of the walls.

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