US3528421A - Disposable absorbent underpad or the like - Google Patents

Disposable absorbent underpad or the like Download PDF

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US3528421A
US3528421A US3528421DA US3528421A US 3528421 A US3528421 A US 3528421A US 3528421D A US3528421D A US 3528421DA US 3528421 A US3528421 A US 3528421A
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sheet
absorbent
layer
liquid
surface
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Vincent L Vaillancourt
Thomas Thackston
Donald R Roberts
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CR Bard Inc
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CR Bard Inc
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/53743Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
    • A61F13/53747Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer is facing the topsheet
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/53743Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
    • A61F13/53756Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer facing the back-sheet
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
    • A61L15/00Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/18Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F2013/15008Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterized by the use
    • A61F2013/15016Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterized by the use for breast; pads for bras
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51409Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a film
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530131Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/53051Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
    • A61F2013/530532Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged the maximum being at certain depth in the thickness
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/53051Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
    • A61F2013/530547Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged positioned in a separate layer or layers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F2013/53445Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad from several sheets

Description

United States Patent [72] Inventors Vincent L. Vaillancourt' Livingston, New Jersey; 2 Thomas Thackston, Florham Park, New Jersey; Donald R. Roberts, North Plainfield, New Jersey [21] Appl. No. 784,668 [22] Filed Dec. 18, 1968 [45] Patented Sept. 15, 1970 [73] Assignce C.R. Bard Inc.

Murray Hill, New Jersey a corporation of New York 541 DISPOSADLE nnsonnizis'r n'iimini w OR THE LIKE 21 Claims, 4 Drawing Figs.

[52] US. Cl 128/284, 128/156, 128/287, 128/296, 5/90, 5/354 [51] lnt.Cl. ..A61f 13/18, B32b 3/24, B32b 3/26 Field ofSearch 5/90, 91,

[56] References Cited UNITED STATES PATENTS 2,620,494 12/ 1952 Kay 297/219X 2,660,735 l/1953 Baum 5/354 2,707,289 5/1955 Taggart 5/354 3,344,789 10/1967 Arnold et al 128/287 3,427,670 2/1969 Mimoy 5/354 3,431,911 3/1969 Meiset, Jr. 128/287 Primary Examiner-Casmir A. Nunberg Attorney-W. Saxton Seward ABSTRACT: A disposable absorbent underpad for hospital patients, or similar product, in which a powdered chemical absorbent such as hydrous calcium silicate is deposited in retentive relation to a sheet or sheets of cotton linters or the like, the combination sheet or sheets and powder being preferably faced upwardly with a permeable sheet of non-wetting material such as spun-bonded polyester and backed with a liquid impervious sheet of polyethylene or the like extending across the entire bottom surface and folded over the edges of the underpad.

Patented Sept. 15, 1970 t 3,528,421

Fl G.|

willf FIG.3

Vincent LVAiHZnCoUHZ Thomas ThbckstOn Donald RtRoberf m tmat ATTORNEYS INVENTORS DISPOSABLE ABSORBENT UNDERPAD OR THE LIKE Underpads currently available are commonly formed of a 0.5 to 1.0 mil film of polyethylene as a water-proof backing, absorbent wadding or loose pulp generally of a cellulosic nature and a cover sheet of soft, wet-strength, non-woven material. Such a pad in the common sizes of 17%" x 24" or 36" x 24" can absorb 25 to 50 ml. of water and will remain entirely wet and soggy to the touch. The presence of such a wet pad is very detrimental to the patient, causing diaper rash or other skin irritations unless the pads are changed often and offering no protection or comfort to the patient. In many cases liquid runs off the pads onto the bed sheets. In practice several such pads may be used at a time, with frequent changes, increasing the expense and taking up nursing time.

It is, therefore, an object of this invention to provide a disposable bedpad or the like having an absorption layer of wet-strength paper which immobilizes urine (or other liquid) and offers the patient a relatively drier surface on which to lie, thereby decreasing his chances of developing bedsores, secondary bacterial infection, and any other skin irritation associated with skin and urine contact for extended periods of time.

A previous attempt was made (as shown in U.S. Pat. No. 3,344,789) to immobilize urine using hydrous calcium silicate. Such attempts have been shown to be inadequate. For example, when the powder is packaged in packets it creates a very lumpy and uncomfortable pad and is extremely difficult to dispose of, and at the same time is extremely costly.

It has now been found that the filling of a paperboard sheet on conventional paper-forming equipment such as a fourdrinier, with hydrous calcium silicate provides a product which is softer, more comfortable, immobilizes more liquid, and is easier to dispose of, as well as being easier to manufacture. It has been found that certain grades (the absorbent ones) of cotton linter pulp provide a better finish in combination with a hydrous calcium silicate along with commercially available retention aids for helping to retain the powder in the sheet. Using this technology, paperboard can be filled with the hydrous calcium silicate in quantities of up to 70 percent by weight. Laboratory hand sheets indicate that the quantity may be as high as 80 percent although at this high percent the product is fragile. In theory the greater the loading of absorbent powder, the more absorbent the resultant product will be per given basis weight and obviously the more economical the product is on a cost performance basis.

It has been found that the amount of liquid immobilized is a factor of three parameters, (1) Amount of powder, (2) Type of pulp, (3) Density of the sheet. Laboratory experiments show that products made using the same pulp, the same quantity of powder (based on a standard TAPPI ash test) but having different densities, do in fact, immobilize different quantities of urine (any liquid). The less dense the sheet the more liquid the sheet will immobilize.

The cotton linter pulp offers the advantage of being able to disperse the fluid from the point of contact to the outer fringes of the pad, thereby utilizing a greater percentage of surface than other products now available.

If a pad is designed to hold 330 ml of liquid, it has been found when up to 80 percent of this amount is put on the product its surface will become dry to the touch within lk to 5 minutes. If only percent or 20 percent of the theoretical limit is utilized the surface will dry in 30 seconds or less. When an amount of fluid less than the designed limit of the sheet is immobilized, the sheet (or bedpad) can be held up or squeezed and no liquid will drip from it; this drastic demonstration of fluid retention and patient protection cannot be ps tq msqx j a t sm sa abls prq t a l A modified form of absorbent product is made by hydroforming, using conventional paper technology, two layers of paperboard which ideally should be cotton linter stock but may be other materials such as alpha cellulose, wood pulp, etc. Between the two layers is sandwiched hydrous calcium silicate which may be deposited in line on the first formed layer product. In this fashion the hydrous calcium silicate is trapped between the two layers. This product will also behave quite similarly to the previous one mentioned above which may be referred to as a Matrix powder paper product. One advantage of this modified product is in those applications where the edges are confined and large immobilizing capacities required; the two outer layers, one on either side, can be relatively thin with a heavy layer or core of hydrous calcium silicate. In a modification of this particular composition, the bottom layer may be of a water-proof barrier material such as polyethylene.

Additionally, a non-wetting material such as spunbonded polyester may be provided to serve as the cover layer for either of the two products, that is, the Matrix powder paper, or the composite sheet product previously mentioned. When using this type product one commercially available material of this type is Remay (a product of the DuPont Company). It has been found that two significant advantages accrue from the use of such a material. The first is that, for a given amount of fluid poured onto the surface of the product with the Remay surface layer or like product, the time required to achieve a dry surface, that is dry to the touch or skin, is appreciably reduced. Reductions of time in excess of 50 percent have been experienced. The second significant advantage is that it has been found that the immobilizing capacity of the underlayer, that is, the Matrix powder paper product or composite sheet, is increased. This is apparently due to the fact that the layers of the Matrix powder paper product which are at the surface or immediately adjacent to the surface can be utilized to immobilize liquid without experiencing a surface wet to the touch or skin. Evidence appears to indicate that at least 10 percent additional capacity per given sheet can be expected.

The pads according to the present invention can immobilize from 25 to 500 ml. of liquid while remaining relatively dry to the touch. As a result, there is effected reduction in number of pads used, number of changes, hospital inventory, patient discomfort and irritation, number of sheets soiled, and need for nursing attention.

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

FIG. 1 represents a plan view of one comer of the underpad, parts being broken away;

FIG. 2 represents a section on the line IIII of FIG. 1, the thickness of the layers being exaggerated for purposes of illustration;

FIG. 3 represents a similar section showing a duplication of the absorbent layers; and

FIG. 4 represents a similar section of a modified form of underpad.

The underpad is shown in FIGS. 1 and 2 as comprising a combined distribution and absorption layer 1 made of 100 percent cotton linter pulp, and a quantity of hydrous calcium silicate (commercially available, for instance, under the trademark Micro-Cel-E, Johns-Mansville Sales Corp., which is capable of immobilizing up to 560 percent of its weight of liquid while remaining a dry powder) included in the pulp to form a homogeneous sheet of any desired thickness, resembling blotting paper. The precent (by weight) of powder in a sheet can vary widely, depending on the desired end use, but the maximum is about percent for practical purposes. The powder is added to the pulp according to methods which are conventional in paper making. Cotton linters have excellent wicking properties and assure immediate distribution of the liquid to the included powder.

The cover layer 2 is a non-woven porous material having non-wetting properties and capable of transmitting liquid rapidly while retaining its wet strength. Spunbonded polyester gives excellent results and other non-woven fabrics produced by conventional methods are satisfactory.

The backing layer 3 is a liquid-proof barrier between the absorbent layer 1 and the support (e.g. bed) on which it rests, being conveniently constituted by a sheet of 0.5 mil to 1.0 mil polyethylene, turned up around the marginal edges of the layers 1 and 2 and overlying the peripheral portions thereof as indicated at 4 where the three layers are sealed together. The backing layer may be turned up and sealed around all four sides of a rectangular pad, as indicated in FIG. 1, or may be left unsealed across the shorter ends.

If greater capacity is desired than that provided by a single distribution and absorption layer, this element may be duplicated or multiplied, FIG. 3 showing a section of a pad having two such layers 5, 6 covered by a non-woven porous sheet 7, as described above, and backed by a liquid impervious sheet 8, also as previously described.

Each layer 1, 5 or 6 may suitably have an uncompressed thickness in the range of 0.25-2.5 mm, which provides adequate flexibility as well as absorption capacity. A plurality of such layers, where needed, are naturally more flexible than a single layer of equal thickness.

In the modified form of FIG. 4, a layer of hydrous calcium silicate 9 is shown as being sandwiched between upper and lower layers 10, 11 of paperboard which is preferably cotton linter stock but may be alpha cellulose, wood pulp or the like. The layers 9, l and 11 are shown as being backed by a sheet or film of impermeable material 12, as in the case of FIGS. 1 to 3, this sheet being folded around the edges, as indicated at 13 in order to enclose completely the layer of absorbent material, thus forming, in effect, a single large packet of powder, the displacement of which is inhibited by association with the adjacent surface or surfaces of distribution material. A cover sheet 14, corresponding to the sheet 2, may be provided if desired. Variations of the form shown in FIG. 4, which can be understood without specific illustration, include increasing the thickness of the absorbent layer 9 relative to layers 10 and/or 11 for greater liquid immobilizing capacity, and omitting the layer 11 (the layer 9 being deposited directly on the sheet 12).

If the upper surface of the sheets 1, and is of a suitable character (e.g., smooth and/or soft enough to be comfortable) the cover sheet 2, 7 or 14 may be omitted, the wicking action of the distribution material being relied on to remove liquid rapidly from the upper surface and conduct it to the immobilizing material.

The materials described above appear to be applicable not only to use as hospital underpads, but also in appropriate sizes and shapes-as sanitary napkins, nursing cups, diapers, wound dressings and other applications not necessarily limited to the medical field.

We claim:

1. An absorbent article for absorbing liquid wastes comprising a body layer containing a substantially uniformly distributed powdered chemical absorbent characterized by the ability to immobilize without becoming wet at least 400 percent of its weight of liquid a porous cover sheet extending over one surface of said layer and a liquid impermeable backing sheet extending over another surface of said body.

2. An absorbent article according to claim 1 in which the body layer is a sheet of homogeneously combined fibrous distribution material and powdered chemical absorbent.

3. An absorbent article according to claim 1 in which the body layer includes at least one sheet of cotton linter pulp.

4. An absorbent article according to claim 2 in which the distribution material is cotton linters.

5. .An absorbent article according to claim 1 in which the absorbent is hydrous calcium silicate.

6. An absorbent article according to claim 2 in which the absorbent is hydrous calcium silicate in a proportion up to percent by weight of the combined materials.

7. An absorbent article according to claim 1 in which the body layer includes at least one sheet of fibrous distribution material and the absorbent is distributed as a layer between said sheet and the backing sheet.

8. An absorbent article according to claim 1 in which the body layer includes two sheets of fibrous distribution material and the absorbent is distributed as a layer between said two sheets.

9. An absorbent article according to claim 1 in which the cover sheet is a non-woven fabric. I

10. An absorbent article according to claim 9 in which the cover sheet is a spun bonded polyester.

11. An absorbent article according to claim 1 in which the backing sheet covers the entire surface of the body layer opposite the surface covered by the porous cover sheet and is folded over at least two opposite edges of said body layer and cover sheet.

12. An absorbent article according to claim 7 in which the backing sheet covers the entire surface of the body layer opposite the surface covered by the porous cover sheet and is folded over all the edges of the body layer and cover sheet to enclose the layer of absorbent.

13. An absorbent article according to claim 2 in which the article is a disposable incontinent pad, bed pad or under pad.

14. An absorbent article according to claim 7 in which the article is a disposable incontinent pad, bed pad or under pad.

15. An absorbent article according to claim 2 in which the article is formed in a size and shape adapting it for personal wear.

16. An absorbent article for absorbing liquid wastes comprising a sheet of homogeneously combined fibrous liquid distribution material and a substantially uniformly distributed powdered chemical absorbent characterized by the ability to immobilize without becoming wet at least 400 percent of its weight of liquid, and means associated with one surface of said sheet for inhibiting the passage of liquid therefrom to a surface in contact therewith.

17. An absorbent article for absorbing liquid wastes comprising fibrous liquid distribution material and a powdered absorbent material characterized by a sheet-like body comprising said distribution material and the absorbent material in intimate contact with each other, said absorbent material having the ability to immobilize without becoming wet at least 400 percent of its weight in liquid.

18. An absorbent article according to claim 17 in which the absorbent material is disposed in a layer covered by the distribution material.

19. An absorbent article according to claim 18 which includes a liquid impermeable backing sheet.

20. An absorbent article according to claim 17 in which the sheet-like body includes two layers of said fibrous distribution material and a layer of said absorbent material sandwiched between said two layers.

21. An absorbent article according to claim 20 which includes a liquid impermeable backing sheet.

US3528421D 1968-12-18 1968-12-18 Disposable absorbent underpad or the like Expired - Lifetime US3528421A (en)

Priority Applications (1)

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US78466868A true 1968-12-18 1968-12-18

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DE (1) DE1946056A1 (en)
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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761973A (en) * 1971-07-02 1973-10-02 R Leventhal Plastic back absorption pad sheet assembly
US3865110A (en) * 1973-08-14 1975-02-11 Robert F Traverse Diaper and integral eversion container
US3903889A (en) * 1973-02-16 1975-09-09 First National Bank Of Nevada Disposable liquid absorbent products
US3908659A (en) * 1974-03-14 1975-09-30 Procter & Gamble Absorbent pad structure, diaper construction utilizing same and methods of manufacture thereof
US4021870A (en) * 1976-01-23 1977-05-10 Hygeia Corporation Bedding draw sheet
US4055180A (en) * 1976-04-23 1977-10-25 Colgate-Palmolive Company Absorbent article with retained hydrocolloid material
US4102340A (en) * 1974-12-09 1978-07-25 Johnson & Johnson Disposable article with particulate hydrophilic polymer in an absorbent bed
US4105033A (en) * 1974-12-09 1978-08-08 Personal Products Company Powdered grafted cellulose
FR2463638A1 (en) * 1979-08-18 1981-02-27 Tokuyama Soda Kk absorbent material
WO1981001643A1 (en) * 1979-12-10 1981-06-25 Molecular Sieve Systems Inc Diaper
EP0163287A2 (en) * 1984-05-29 1985-12-04 Kimberly-Clark Corporation Improved incontinent garment, catamenial device or wound dressing
US4578068A (en) * 1983-12-20 1986-03-25 The Procter & Gamble Company Absorbent laminate structure
US4600458A (en) * 1983-12-20 1986-07-15 The Procter & Gamble Co. Method of making an absorbent laminate structure
US4610678A (en) * 1983-06-24 1986-09-09 Weisman Paul T High-density absorbent structures
US4664959A (en) * 1981-12-28 1987-05-12 Dagenais J Roger Absorbent bed pad
US4908026A (en) * 1986-12-22 1990-03-13 Kimberly-Clark Corporation Flow distribution system for absorbent pads
US4923453A (en) * 1989-01-23 1990-05-08 Bullard Jr Milton Absorbent disposable cover
US4994037A (en) * 1990-07-09 1991-02-19 Kimberly-Clark Corporation Absorbent structure designed for absorbing body fluids
US5009650A (en) * 1984-04-13 1991-04-23 Kimberly-Clark Corporation Absorbent structure designed for absorbing body fluids
US5125121A (en) * 1991-09-10 1992-06-30 Wroble Ida B Cushion protection system for the incontinent
US5176668A (en) * 1984-04-13 1993-01-05 Kimberly-Clark Corporation Absorbent structure designed for absorbing body fluids
US5221273A (en) * 1991-03-28 1993-06-22 Medical Disposables Company Underpad
WO1994002092A1 (en) * 1992-07-27 1994-02-03 The Procter & Gamble Company Sanitary napkin having a central acquisition zone
US5300054A (en) * 1991-01-03 1994-04-05 The Procter & Gamble Company Absorbent article having rapid acquiring, wrapped multiple layer absorbent body
US5304161A (en) * 1991-01-03 1994-04-19 The Procter & Gamble Company Absorbent article having rapid acquiring, multiple layer absorbent core
US5395359A (en) * 1991-01-25 1995-03-07 Kao Corporation Absorbent article
DE29506277U1 (en) * 1995-04-11 1995-06-01 Graether Dieter Insert for use as a diaper or bed pad, especially for heavily incontinent individuals
US5532350A (en) * 1994-02-15 1996-07-02 Rhone-Poulenc Inc. Crosslinked polysaccharides useful as absorbent materials
US5669895A (en) * 1991-11-11 1997-09-23 The Procter & Gamble Company Absorbent article having rapid distribution strip
US5728084A (en) * 1992-09-16 1998-03-17 The Proctor & Gamble Company Absorbent article with controlled distribution of liquid
US5801116A (en) * 1995-04-07 1998-09-01 Rhodia Inc. Process for producing polysaccharides and their use as absorbent materials
US6341393B1 (en) * 1995-09-13 2002-01-29 Ergodyne Corporation Patient transfer and repositioning system
US20040093671A1 (en) * 2000-04-07 2004-05-20 Sten Bjornberg Hygiene mat
US20070174962A1 (en) * 2006-01-30 2007-08-02 Mary Smith Mattress protector
US20100280473A1 (en) * 2005-10-05 2010-11-04 Sca Hygiene Products Ab Absorbent Article Comprising a Contraphilic Polymer
US20110028928A1 (en) * 2008-03-31 2011-02-03 Uni-Charm Corporation Absorber forming crossbridge upon absorbing
US20160222685A1 (en) * 2015-01-31 2016-08-04 Ramshorn Corporation Concrete curing blanket
ES2640140A1 (en) * 2017-05-30 2017-10-31 Dokhand Technology, S.L. Retention system for spills, dust mites and dirt in padded bodies
US10070741B1 (en) * 2015-04-20 2018-09-11 Elizabeth Sofro Bedding device and system

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761973A (en) * 1971-07-02 1973-10-02 R Leventhal Plastic back absorption pad sheet assembly
US3903889A (en) * 1973-02-16 1975-09-09 First National Bank Of Nevada Disposable liquid absorbent products
US3865110A (en) * 1973-08-14 1975-02-11 Robert F Traverse Diaper and integral eversion container
US3908659A (en) * 1974-03-14 1975-09-30 Procter & Gamble Absorbent pad structure, diaper construction utilizing same and methods of manufacture thereof
US4102340A (en) * 1974-12-09 1978-07-25 Johnson & Johnson Disposable article with particulate hydrophilic polymer in an absorbent bed
US4105033A (en) * 1974-12-09 1978-08-08 Personal Products Company Powdered grafted cellulose
US4064577A (en) * 1976-01-23 1977-12-27 Hygeia Corporation Bedding draw sheet
US4021870A (en) * 1976-01-23 1977-05-10 Hygeia Corporation Bedding draw sheet
US4055180A (en) * 1976-04-23 1977-10-25 Colgate-Palmolive Company Absorbent article with retained hydrocolloid material
FR2463638A1 (en) * 1979-08-18 1981-02-27 Tokuyama Soda Kk absorbent material
WO1981001643A1 (en) * 1979-12-10 1981-06-25 Molecular Sieve Systems Inc Diaper
US4664959A (en) * 1981-12-28 1987-05-12 Dagenais J Roger Absorbent bed pad
US4610678A (en) * 1983-06-24 1986-09-09 Weisman Paul T High-density absorbent structures
US4578068A (en) * 1983-12-20 1986-03-25 The Procter & Gamble Company Absorbent laminate structure
US4600458A (en) * 1983-12-20 1986-07-15 The Procter & Gamble Co. Method of making an absorbent laminate structure
US5176668A (en) * 1984-04-13 1993-01-05 Kimberly-Clark Corporation Absorbent structure designed for absorbing body fluids
US5009650A (en) * 1984-04-13 1991-04-23 Kimberly-Clark Corporation Absorbent structure designed for absorbing body fluids
EP0163287A3 (en) * 1984-05-29 1986-10-08 Kimberly-Clark Corporation Improved incontinent garment, catamenial device or wound dressing
EP0163287A2 (en) * 1984-05-29 1985-12-04 Kimberly-Clark Corporation Improved incontinent garment, catamenial device or wound dressing
US4908026A (en) * 1986-12-22 1990-03-13 Kimberly-Clark Corporation Flow distribution system for absorbent pads
US4923453A (en) * 1989-01-23 1990-05-08 Bullard Jr Milton Absorbent disposable cover
US4994037A (en) * 1990-07-09 1991-02-19 Kimberly-Clark Corporation Absorbent structure designed for absorbing body fluids
US5304161A (en) * 1991-01-03 1994-04-19 The Procter & Gamble Company Absorbent article having rapid acquiring, multiple layer absorbent core
US5439458A (en) * 1991-01-03 1995-08-08 The Procter & Gamble Company Absorbent article having rapid acquiring, multiple layer absorbent core
US5300054A (en) * 1991-01-03 1994-04-05 The Procter & Gamble Company Absorbent article having rapid acquiring, wrapped multiple layer absorbent body
US5395359A (en) * 1991-01-25 1995-03-07 Kao Corporation Absorbent article
US5221273A (en) * 1991-03-28 1993-06-22 Medical Disposables Company Underpad
US5125121A (en) * 1991-09-10 1992-06-30 Wroble Ida B Cushion protection system for the incontinent
US5669895A (en) * 1991-11-11 1997-09-23 The Procter & Gamble Company Absorbent article having rapid distribution strip
WO1994002092A1 (en) * 1992-07-27 1994-02-03 The Procter & Gamble Company Sanitary napkin having a central acquisition zone
US5728084A (en) * 1992-09-16 1998-03-17 The Proctor & Gamble Company Absorbent article with controlled distribution of liquid
US5532350A (en) * 1994-02-15 1996-07-02 Rhone-Poulenc Inc. Crosslinked polysaccharides useful as absorbent materials
US5801116A (en) * 1995-04-07 1998-09-01 Rhodia Inc. Process for producing polysaccharides and their use as absorbent materials
DE29506277U1 (en) * 1995-04-11 1995-06-01 Graether Dieter Insert for use as a diaper or bed pad, especially for heavily incontinent individuals
US6341393B1 (en) * 1995-09-13 2002-01-29 Ergodyne Corporation Patient transfer and repositioning system
US20040093671A1 (en) * 2000-04-07 2004-05-20 Sten Bjornberg Hygiene mat
US9421136B2 (en) * 2005-10-05 2016-08-23 Sca Hygiene Products Ab Absorbent article comprising a contraphilic polymer
US20100280473A1 (en) * 2005-10-05 2010-11-04 Sca Hygiene Products Ab Absorbent Article Comprising a Contraphilic Polymer
US20070174962A1 (en) * 2006-01-30 2007-08-02 Mary Smith Mattress protector
US20110028928A1 (en) * 2008-03-31 2011-02-03 Uni-Charm Corporation Absorber forming crossbridge upon absorbing
US8895799B2 (en) * 2008-03-31 2014-11-25 Uni-Charm Corporation Absorber forming crossbridge upon absorbing
US20160222685A1 (en) * 2015-01-31 2016-08-04 Ramshorn Corporation Concrete curing blanket
US9739068B2 (en) * 2015-01-31 2017-08-22 Ramshorn Corporation Concrete curing blanket
US10070741B1 (en) * 2015-04-20 2018-09-11 Elizabeth Sofro Bedding device and system
ES2640140A1 (en) * 2017-05-30 2017-10-31 Dokhand Technology, S.L. Retention system for spills, dust mites and dirt in padded bodies

Also Published As

Publication number Publication date
DE1946056A1 (en) 1970-07-02
GB1265872A (en) 1972-03-08
SE358293B (en) 1973-07-30

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