U.S. patent number 3,610,238 [Application Number 05/032,636] was granted by the patent office on 1971-10-05 for wound infection prevention device.
This patent grant is currently assigned to N/A. Invention is credited to Edward Rich, Jr..
United States Patent |
3,610,238 |
Rich, Jr. |
October 5, 1971 |
WOUND INFECTION PREVENTION DEVICE
Abstract
A wound infection prevention device, for the treatment of burns,
skin lesions, etc., comprises a cellular-foam plastic pad encased
by impervious plastic sheets and to which air under pressure may be
fed to an annular space about the periphery of the foam plastic
pad. In use the device is removed from a sterile package, the
physician cuts a hole in the center entirely through the material
and of sufficient size to surround the wound, and air is then fed
under pressure into the annular space and then passes through the
body of the porous pad onto the wound and then passes upwardly to
prevent the settling of bacteria-bearing dust on the wound.
Inventors: |
Rich, Jr.; Edward (College
Park, MD) |
Assignee: |
N/A (N/A)
|
Family
ID: |
21865997 |
Appl.
No.: |
05/032,636 |
Filed: |
April 28, 1970 |
Current U.S.
Class: |
604/23; 128/847;
604/289; 604/312 |
Current CPC
Class: |
A61F
13/00068 (20130101); A61F 2013/0074 (20130101); A61F
2013/00255 (20130101); A61F 2013/00412 (20130101); A61F
2013/00165 (20130101); A61F 2013/51409 (20130101); A61F
2013/00157 (20130101); A61F 2013/530802 (20130101); A61F
2013/00519 (20130101); A61F 2013/00863 (20130101); A61F
2013/0017 (20130101); A61F 2013/00174 (20130101) |
Current International
Class: |
A61F
13/00 (20060101); A61F 13/15 (20060101); A61m
013/00 () |
Field of
Search: |
;128/184,254,256,257,399,400,DIG.20,402,38,132,154,297 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Mitchell; J. B.
Claims
What is claimed is:
1. A wound infection prevention device comprising a porous pad; a
bag of air-impervious material encompassing said pad and attached
to at least the peripheral edges of the upper and lower surfaces
thereof, said bag defining an annular channel surrounding the
periphery of said pad; and air inlet means penetrating said bag at
said annular channel.
2. A device in accordance with claim 1 wherein said porous pad
comprises a cellular-foam plastic material.
3. A device in accordance with claim 2 wherein said foam plastic is
polyurethane.
4. A device in accordance with claim 1 wherein said bag is formed
of plastic.
5. A device in accordance with claim 4 wherein said plastic bag
comprises a pair of plastic sheets laminated at their peripheries
to each other, and each being respectively laminated to opposite
surfaces of said porous pad to effect said attachment.
6. A device in accordance with claim 5 wherein said sheets are
laminated to said porous pad by means of adhesive.
7. A device in accordance with claim 1 wherein said air inlet means
comprises a plastic pipe passing through said bag at said annular
channel, said plastic pipe being adapted for connection at its
other end to means for feeding air under pressure therethrough; and
a filter disposed along the length of said plastic pipe.
8. A device in accordance with claim 1 further comprising a layer
of adhesive along one outside surface of said bag.
9. A device in accordance with claim 1 of annular form whereby an
opening is provided in the center thereof, which opening passes
through both said bag and said pad.
10. A device in accordance with claim 1 wherein said porous pad is
formed of an inert plastic foam; said bag of air-impervious
material is formed of two sheets of film material laminated to one
another at their peripheries and each adhesively united to said
porous plastic pad; said air inlet means comprises a plastic pipe
having a filter along its length and adapted for connection to a
source of pressurized gas; and further comprising a layer of
adhesive along the outside surface of one of said sheets of film
material.
Description
The present invention relates to a wound infection prevention
device and, more particularly, to a device which promotes healing
of a wound and simultaneously prevents infection of the wound from
outside sources by the constant blowing of air or oxygen over the
wound.
One of the most troublesome problems in the medical field, either
after surgery or in the treatment of burns or other severe skin
lesions, is the risk of infection. This problem of infection is
particularly great when bandages or other coverings cannot be
applied to the wound. Even when a bandage can be so applied, this
serves to cut off the healing supply of oxygen to the wound and
inhibits rapid healing.
To overcome these problems it has been suggested that the patient
be enclosed in a tent to exclude bacteria and other microbes.
However, besides the expense of such an expedient, this does not
exclude microbes eminating from the patient himself. Another
suggested proposal has been the use of laminar flow canopies to
continuously air wash the wound, but these devices are exceedingly
expensive costing on the order of several thousand dollars
apiece.
Accordingly, the available choices facing the physician in the
treatment of burns, skin lesions, etc., to prevent infection are:
(a) applying medication to prevent infection, but cutting off air
to the wound; (b) covering the wound, with resultant damage to skin
tissue with removal of the covering, and also cutting down the
amount of air reaching the wound; (c) enclosing the patient in a
tent to exclude room microbial contents, but not those eminating
from the patient; and (d) using laminar flow canopies to
continuously air wash the wound at an exceedingly high cost.
A wound infection prevention device has now been developed to
overcome the above defects, the device comprising a porous pad
encased in an air-impervious bag to which the upper and lower
surfaces of the pad are attached, and the device defining a annular
channel surrounding the periphery of the pad into which air may be
fed under pressure. The entire device may be manufactured in
annular shape, or the center section may be cut out immediately
prior to use. In either event the device is placed around the wound
on the skin of the patient and air is fed to the annular chamber
and passes through the porous pad and then flushes over the wound
and then upwardly to prevent dust and airborne bacteria from
falling on the wound.
It is, accordingly, an object of the present invention to overcome
the defects of the prior art, such as indicated above.
It is another object of the present invention to provide a new
technique for aiding in the rapid healing of wounds.
It is another object of the present invention to provide a wound
infection prevention device which both assists in rapid healing of
wounds and serves to reduce the risk of infection.
It is another object of the present invention to provide a wound
infection prevention device which does not cut off air to the
wound, which does not damage skin tissue, which serves to exclude
bacteria from contact with the wound, and yet which is simple and
inexpensive.
To the attainment of these ends and the accomplishment of the above
as well as other new and useful objects as will appear below, the
present invention is provided by way of the following exemplary and
nonlimitative description and the accompanying drawings of an
exemplification illustrating this invention, and in which:
FIG. 1 is a perspective view of a device in accordance with the
present invention;
FIG. 2 is a plan view of the device of FIG. 1, prior to its
adaptation by the physician for use;
FIG. 3 is a section taken along lines 3--3 of FIG. 2;
FIG. 4 is a sectional view, similar to FIG. 3, showing the device
in use; and
FIG. 5 is a diagrammatic view showing the device in use.
In its illustrated form, the wound infection prevention device can
generally comprise a porous pad 12, a bag 14 of air-impervious
material encompassing the pad 12 and attached to its upper and
lower surfaces, the bag defining an annular channel 16 surrounding
the periphery of the pad 12. In addition, an air inlet means such
as a tube or pipe 18 is provided which penetrates the bag 14 at the
location of the annular channel 16. While the device 10 is
illustrated as being of rectangular configuration, it will, of
course, be understood that any shape is suitable, such as
elliptical or circular. In more detail, it is preferred that the
pad 12 be formed of a cellular-foam plastic material, preferably
open-cell polyurethane foam; in the preferred embodiment, the cell
size is on the order of 100 mesh. Other materials can be used as
replacements for the polyurethane foam plastic, and these other
materials include other sponge plastic or sponge rubber. It is also
possible to use a porous material formed of interlocked or woven
fibers; as an example fiber glass or cotton padding may be
mentioned. However, the polyurethane foam is preferred because of
its filtering ability, its inertness, its low expense and its
ability to be easily sterilized.
The bag 14 which encompasses the pad 12 is preferably formed of
plastic material, such as polyethylene, polypropylene, vinyl
plastic, etc., although it may be formed of other air-impervious
materials such as metal foil. In either event, however, the bag is
preferably formed of two sheets 142 and 144 of air-impervious
material laminated or otherwise united at their peripheries to each
other to form a seam 146. As indicated above, the bag 14 is
attached along its inner surface to the outer surfaces of the pad
12; this attachment may be made by means of adhesive, heat-sealing
or any other laminating procedure. The seam 146 is preferably
formed by heat sealing the plastic sheets 144 and 142.
Preferably the device 10 is provided on one of its exterior
surfaces with an adhesive coating 20 suitable for application to
the skin. It will be understood, however, that the adhesive layer
20 is not essential and that in operation the device may be taped
to the skin using conventional adhesive tape.
The plastic air or oxygen pipe 18 is preferably provided along its
length with a filter 22, and the free end of such air pipe 18 is
adapted to be connected to a suitable source (not shown) of air or
oxygen pressure, such as a tank of compressed air, oxygen or other
gas, or a simple air pump or compressor. Other means may be
optionally placed along the length of the air pipe 18 for insuring
that the air is germ free, and such other means may include a
device for feeding minute quantities of an antiseptic gas, e.g., up
to 100 parts per million of ethylene oxide, or the air passing
through tube 18 may be bubbled through a liquid antiseptic. Another
alternative is the provision of an antiseptic in the filter 22.
It will be understood that after manufacture the device will be
incorporated into a sterile package, e.g., a plastic bag the
contents of which are sterilized with ethylene oxide. The devices
are distributed in this form and remain sterile until they are
needed for use. When needed, the device 10 is removed aseptically
by the physician, folded in half and a portion is cut out of the
center such as shown in FIG. 1, the opening representing the major
area of the patient to be protected. If the device has the adhesive
coating 20, a paper covering is removed therefrom for application
to the patient; alternatively the device is merely taped to the
patient so that the cutaway opening overlies the wound.
Alternately, the device can be manufactured in annular form with
the opening provided in the center thereof, in which case little or
no cutting will be required by the physician.
After removal of the device from its sterile container and any
cutting which is required, the device is then placed on the patient
as indicated above. The free end of the tube 18 is connected to the
source of pressurized gas and the suitable gas, preferably air, is
introduced to the device as shown in FIG. 5. It will be seen best
from FIG. 4 that the filtered air passes through the tube 18,
around the annular plenum or space 16 and through the porous pad
12. After passage through such pad, the air then flushes over the
wound 24 of the patient 26, and from there the air then moves
upwardly as shown by the arrows in FIG. 4. Since the air can only
travel freely upwardly, a blanket flow is produced that results in
a protective environment about the wound 24.
The material used for the pad 12, preferably a flexible
polyurethane foam of the type described above, should be an open
material which has an effective pore size of several microns. The
porous cellular polyurethane foam structure has a geometry which is
such that over a distance of 0.5 inches, the cellular foam entraps
bacteria at the low air pressures utilized and provides clean air
with no measurable microbial content. Another advantage to the
cellular polyurethane foam, or similar plastic foam, is that the
multiple-pore structure provides a relatively uniform distribution
of air about the entire periphery of the wound.
Among the advantages of the present invention are its ability to
afford substantial protection against infection; the fact that it
is flat, and does not interfere with surgery; the fact that it is a
very economical means of affording the desired protection for
burned and open wound areas; the fact that it is sterilizable, the
fact that it is usable in and out of the hospital; and the fact
that the material is inert and not conductive to infection.
The foregoing description of the specific embodiments will so fully
reveal the general nature of the invention that others can, by
applying current knowledge, readily modify such specific
embodiments and/or adapt them for various applications without
departing from the generic concept, and, therefore, such
adaptations and modifications should and are intended to be
comprehended within the meaning and range of equivalence of the
disclosed embodiments. It is to be understood that the phraseology
or terminology employed herein is for purposes of description and
not of limitation.
For example, it will be understood that the opening in the center
may be increased or decreased in size without changing the basic
diffusion characteristics within the limits of adequate
introduction of air to maintain such characteristics and this is
particularly true where the cellular-foam plastic pad is used. It
will also be understood that the annular ring peripheral to the pad
may assume an irregular or other geometrical configuration so as to
conform with any necessary physical requirement. Also, the plastic
pipe 18 may be introduced at other points of an attachment to the
bag for purposes of convenience or for regulating airflow without
altering the basic periphery-to-center airflow characteristic.
Also, while the disclosed embodiment is shown as comprising but a
single pad with a single annular plenum, it will be understood that
several annular rings may coexist as separations in the foam
plastic material with several plastic pipes being provided and so
attached for the introduction of air to control the volume of
airflow to the center opening.
* * * * *