Year: 1898

page_text: I, WALTER SAHLI, Doctor of Medicine, residing at Langenthal, in the Republic
of Switzerland, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved plaster bandage strip, which differs from
those hitherto used in that the quantity of powdered plaster intended for the
production of a plaster bandage is surrounded with a covering in the form of a
hose or stocking, and made of knitted material which is permeable by water.
In this covering a layer of plaster of uniform breadth and thickness is formed.
The plaster strips, or bands, hitherto employed for making plaster bandages
are, as is known, produced simply by spreading or sprinkling long strips of
material with plaster and then rolling them up tightly. If it be desired to
apply a plaster bandage a strip of the kind so rolled up, is first laid in water
until thoroughly permeated therewith, then squeezed, and un-rolled, and simul-
taneously wound around the limb that is to be bandaged, in the course of which
the plaster lying between the different folds and adhering to the material is
spread as a plaster pulp and in a short time hardens. These plaster strips have
nevertheless the disadvantage that the plaster which is not held sufficiently firm
by the rolled up material, falls out of the outer folds before being used, in
consequence of shaking when the strips are being conveyed from one place
to another, this disadvantage being still more apparent when the strips are laid
in water. Moreover when the strips are un-rolled and the bandage is laid on,
a considerable portion of the plaster still present constantly falls off from the
strips. For these reasons only a relatively small quantity of plaster can be
incorporated in the bandage strips hitherto used, the plaster therein is un-evenly
distributed and many strips must be constantly employed in order to obtain a
firm bandage. At the same time the operation with the strips is a rather
tiresome one.
The plaster bandage strips made according to this invention obviate the difficul-
ties mentioned, as already indicated, and in the following manner: The quantity
of powdered plaster intended for producing a plaster bandage instead of lying
free in the folds of the strips or bands, is surrounded by a hose or stocking like
covering, which is permeable by water and made of knitted material. In this
covering a layer of plaster of uniform breadth and thickness is formed. The hose
or stocking like covering is made of knitted material. After the covering has
D

page_text: been filled with plaster the plaster is uniformly distributed therein a process
which can be properly carried out by means of rollers, with suitable pressure,
whereby the plaster powder is pressed to an uniform thickness and penetrates
into the meshes of the hose like covering, in which it is retained.
Hereupon the strip or band is rolled up, so that the plaster cannot shift in
the folds, lying one over the other, and thus retains its uniform distribution.
As any falling out of the plaster through the sides of the covering is prevented,
a relatively large quantity of plaster powder can be employed, and a strip or
band is obtained which loses nothing of its plaster contents worth speaking of even
in case of much shaking or careless handling. For the same reason the loss of
plaster when the band is laid in water is very trifling, and, during the un-winding
thereof, or the laying on of the bandage no plaster pulp falls off. The new band
allows of the use of large quantities of plaster and the almost complete using
up of the same. It secures the production of an uniformly thick plaster bandage,
with a considerably less length of band and consequently in less time than
formerly. It is much cleaner in handling and simpler than plaster bands open
at the sides.
.
Experiments hitherto made have proved that if there be uniform filling of
the band a double binding of the limb is sufficient for producing a very solid
bandage, whereas with the plaster bands hitherto used, at least 4 to 5 folds are
necessary.
The new plaster strip is distinguished from the contrivance suggested by
Zsigmondy of a plaster bag (according to which for the purpose of obtaining a
plaster covering, plaster powder was served up in a bag and first moistened when
about to be laid on), in that it is not a mere wrapper, limited in its application
as a plaster covering, but capable of being applied by being wound around any
limb or other part of the body-in fact an original and independent plaster band
for forming bandages, and this in consequence of the uniform distribution of
the plaster powder in the rolled up band and that thereby the band is always
ready for use, whereas, in the case of the plaster bag above referred to, it is
necessary before laying on of the wrapper to give it the desired form and uniform
thickness and this involves operations which are tedious, and take up considerable
time, and beyond this, whilst the wrapper is being laid on the greatest possible
care must be exercised in order to maintain anything approaching an uniform
thickness of the plaster filling.
Dated this 28th day of October 1898
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
I, WALTER SAHLI, Doctor of Medicine, residing at Langenthal, in the Republic
of Switzerland, do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement:-
This invention relates to the production of an improved plaster bandage strip,
in which the plaster is surrounded with a hose-like covering made of knitted
material.
The plaster strips or bands hitherto employed for making plaster bandages
are, as is known, produced simply by covering long strips of material with plaster
and then rolling them up tightly. If it be desired to apply a plaster bandage,

page_text: a strip of the kind so rolled up is first laid in water, then squeezed and un-rolled,
and simultaneously wound around the limb that is to bandaged in the course
of which the plaster lying between the different folds is spread as a plaster pulp
and in a short time hardens. These plaster strips have however the disadvantage
that the plaster which is not held sufficiently firm by the rolled up material
falls out of the outer folds before being used, in consequence of shaking, when
the strips are being conveyed from one place to another, this disadvantage being
still more apparent when the strips are laid in water. Moreover when the strips
are un-rolled and the bandage is laid on a considerable portion of the plaster
still present constantly falls off from the strips. For these reasons only a
relatively small quantity of plaster can be incorporated in the bandage strips
hitherto in use, besides which the plaster therein is unevenly distributed and
many strips must be constantly employed in order to obtain a firm bandage.
At the same time the operation with such strips is a rather tiresome one.
The plaster bandage strips made according to this invention obviate the
difficulties mentioned as already indicated. This is effected by surrounding the
plaster with a hose like covering instead of letting it lie unconfined in the folds
of the strip.
In the accompanying drawing Fig. 1 is a cross section and Fig. 2 a longitudinal
section of a plaster bandage strip constructed according to this invention.
As will be seen from Fig. 1 the hose-like covering is filled uniformly with
plaster, so as to contain a plaster layer of suitable thickness and breadth.
The covering a consists of knitted material of hose-like form. After being
inserted in this covering the plaster powder is rolled flat under suitably strong
pressure so as to assume the form of a strip or band in which the plaster material
is compressed into a layer of uniform thickness. In this rolling process a part
of the plaster material penetrates into the meshes of the hose-like covering.
As the separate meshes are not of uniform diameter and run crookedly, they are
able to retain the largest part of the plaster material, whereby the whole plaster
layer acquires a high degree of consistency.
Hereupon the strip or band is rolled up, so that the plaster cannot shift in
the folds, lying one over the other, and thus retains its uniform distribution.
When used, the plaster strip is laid in water in a rolled up condition, like
the strips hitherto employed. The water spreads first into the plaster powder
adhering to the meshes of the knitted material and then through the former
and the said material gradually over the whole plaster layer itself. Hereupon,
the strip is removed from the water. unrolled and wound around the limb to
be bandaged whereby the plaster on the surface of the knitted hose can be easily
spread in the form of a compact plaster pulp of uniform thickness
As any falling out of the plaster through the sides of the covering is pre-
vented, the strip or band is well filled with plaster and loses very little even in
case of being much shaken or carelessly handled. Moreover when the band
is laid in water the loss of plaster is very small.
In consequence of the large quantity of plaster contained in it, a band of this
kind ensures the production of an uniformly thick plaster bandage, with a con-
siderably less length of band and consequently in less time than formerly. At
the same time it is much cleaner in handling and simpler than plaster bands
open at the sides.
Experiments hitherto made have shown that if the band be uniformly filled
a double binding of the limb is sufficient, for producing a very solid bandage,
whereas, with the plaster bands now used at least 4 to 5 folds are necessary.
The new plaster strip is distinguished from the contrivance suggested by
Zsigmondy of a plaster bag covering according to which for the purpose of obtain-
ing plaster bands plaster powder was sewed up in a bag and first moistened after
the bandaging had been effected, in not being a mere plaster bandage of limited
application but one capable of being applied by being wound around any limb
or other part of the body-in fact an independent band for forming bandages,

page_text: and further that, in consequence of the uniform distribution of the plaster
powder in the hose covering and the subsequent rolling of the strip, the process
for fixing the plaster layer, the readiness of the band for use at any time is
assured, whereas in the case of the plaster bag above referred to, it is necessary
before laying on the wrapper to give it the desired form and uniform thickness
by means of operations which are tedious and involve considerable expenditure
of time, beyond which, whilst the wrapper is being laid on, the greatest possible
care must be exercised in order to preserve anything approaching an uniform
thickness of the plaster filling.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. A plaster strip or band consisting of a piece of material in the form of a
hose, containing the plaster powder.
2. The improved plaster bandage strip substantially as described with reference
to the drawings.
Dated thi 90th day of I.... 1900
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.