U.S. patent number 3,747,125 [Application Number 05/257,758] was granted by the patent office on 1973-07-24 for cast sheath with sealing closure.
Invention is credited to Benjamin Goldman, Irwin J. Russakov.
United States Patent |
3,747,125 |
Goldman , et al. |
July 24, 1973 |
CAST SHEATH WITH SEALING CLOSURE
Abstract
A waterproof sheath, comprised of a sock member and a closure
member, for covering and protecting a plaster cast enclosing a
broken limb. The sock member is made of a flexible waterproof sheet
material, such as vinyl plastic sheet, with an outer surface which
is embossed, or otherwise formed, with a coarse grain. The closure
member is comprised of an elongated panel of flexible material
partially encircling the opening of the sock member, and welded to
the sock member around the periphery of the panel. Strap members
extend from each end of the panel, the first strap member having a
buckle and a second strap member being designed to encircle the leg
of the user and pass through the buckle. The second strap member
and the panel are provided with mating strips of fabric having
mutually engaging and locking surfaces, to permit the adjustable
closure of the sock member by means of the closure member.
Inventors: |
Goldman; Benjamin (Studio City,
CA), Russakov; Irwin J. (Van Nuys, CA) |
Family
ID: |
22977628 |
Appl.
No.: |
05/257,758 |
Filed: |
May 30, 1972 |
Current U.S.
Class: |
2/240; 36/8.1;
2/919; 2/61 |
Current CPC
Class: |
A61F
13/04 (20130101); Y10S 2/919 (20130101) |
Current International
Class: |
A61F
13/04 (20060101); A41b 011/10 () |
Field of
Search: |
;2/240,239,DIG.6,61,162,167,161A ;36/7.1R,7.3,8.1,DIG.2
;128/82,157 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Boler; James R.
Claims
We claim:
1. A sheath for covering a surgical cast on the limb of a user,
which sheath comprises:
a sock member loosely receiving said cast, said sock member being
made of a flexible, waterproof, thermoplastic material, the
exterior surface of said sock member being coarsley grained to
present a slip-resistant surface, said sock member having a tubular
opening encircling the leg of said user above said cast; and
a closure member adapted to encircle the leg of a user above said
cast, which member comprises:
a panel of flexible thermoplastic material welded at its periphery
to the exterior surface of said sock member adjacent said tubular
opening, said panel being elongated transversely of said limb and
having sufficient width longitudinally of said limb to provide
water-resistant sealing without substantial impediment to blood
circulation in said leg;
first and second strap members extending from the respective ends
of said panel; a buckle on said first strap member; mating
engagement-fabric strips on said panel and said second strap
member, whereby said second strap may be passed through said
buckle, pulled into water-tight sealing contact with said limb,
folded back to said panel, and retained in tight closure of said
sheath by placing said mating engagement-fabric strips in attaching
contact.
2. A sheath as described in claim 1 in which said engagement-fabric
strip on said panel is spaced around its periphery from the
peripheral weld of said panel to said sock member by spacing not
substantially less than the width of said strip, and said strip is
welded to said panel over substantially its entire adjacent
surface.
Description
This invention relates to an improved protective sheath for a
plaster cast used in the surgical correction of a broken limb.
The sheath of the invention is particularly useful to a person
whose lower leg must remain encased in a plaster cast for several
weeks during the healing of a bone fracture; the invention will,
therefore, be described in terms of a sheath for the foot and lower
leg, although it will be appreciated that special sheaths could be
fabricated within the scope of the invention for the upper leg, or
an arm cast.
A person wearing a cast on his foot or lower leg is usually not
immobilized; he can walk with the aid of crutches or a cane, and
can move from chair to bed, and the like without assistance from
others. He encounters serious difficulty in daily bathing, however,
unless he can protect his plaster cast from water damage.
The entire lower leg and foot can be protected to some degree by
means of a loose-fitting sock of waterproof sheet. In addition to
the sock, some type of garter or strap must be employed around the
sheath and leg above the cast, and usually above the knee, in order
to keep water from running into the sock and damaging the plaster
cast.
In general, waterproof socks which have been tried have been
extremely slippery. A user attempting to walk on a wet tile floor
in a bathroom or shower stall has been exposed to a substantial
risk of falling.
An even greater difficulty has been encountered with attempts to
provide suitable sealing closure of the waterproof sock. Various
garters, straps, and ties, which have been the subject of
experiment, have tended to operate as a torniquet, shutting off
blood supply to the limb encased in the plaster cast. The present
invention overcomes these and other objections to the use of a
protective sheath during bathing by providing a sheath which is
slip resistant and which can be sealed to the leg of the wearer,
with substantially watertight closure, without any significant
interference with blood circulation of the wearer.
The sheath of the present invention employs a sock member which is
made of a flexible plastic sheeting with a coarsely grained
exterior surface. The coarseley grained exterior surface not only
makes the surface of the foot bearing on the floor resistant to
slip, but is also provides a surface near the upper opening of the
sock member upon which a plastic closure member may be securely
welded.
It will be seen from a description of a preferred specific
embodiment hereinafter, that the closure member achieves most of
its sealing to the leg of the wearer, by means of a panel which
distributes a large sealing area over the skin of the leg of the
wearer, thus achieving sealing without undue pressure.
The novel features and the utility of the invention will best be
understood from the following description of a preferred
embodiment, which description should be read with reference to the
accompanying drawings in which:
FIG. 1 is a perspective view of a sheath constructed according to
the invention as it appears in use, enclosing the foot and lower
leg of a wearer;
FIG. 2 is a flat view of the empty sheath;
FIG. 3 is a much enlarged flat view of the upper portion of the
sheath, showing the closure member in detail; and
FIG. 4 shows a cross-sectional view of the sheath of FIG. 1,
looking down from a horizontal plane just above the closure member,
as indicated by the arrows 4--4 in FIG. 1
In FIGS. 1 and 3, the leg of the wearer is indicated symbolically,
in side view of 10 in FIG. 1, and cross-section above the knee at
11 in FIG. 3.
In FIG. 1, the sheath, indicated generally by the numeral 12, is
seen in position on the leg 10.
The sheath 12 is comprised of two functioning parts, a sock member
13 and a closure member 14, the latter being used to tightly close
the sock member opening 15 around the leg 10.
In FIGS. 2 and 3, it is seen that the sock member 13 is comprised
of two pieces of flat plastic sheeting, 13a and 13b, which are
welded together by a heat-seal seam 16, except at leg opening
15.
It is an important feature of the invention, that the plastic
sheeting, preferably a good quality of water-impervious
polyvinylchloride, or other suitable thermoplastic material, is
formed with a coarsely grained exterior surface to present a slip
resistant surface on the fore surface when the user is wearing the
sheath 12. Previously fabricated bags used to cover wound dressings
have had smooth surfaces and would be dangerous to the
already-crippled wearer of a foot cast.
The closure member 14 is illustrated in this preferred specific
embodiment as of the type known in commerce as a Velcro fastener,
although other equivalent engagement-fabric fasteners may be
used.
In previously known designs of this type, the fastener has been
prone to failure under repeated use, where mounted on plastic
sheeting of the type required for the sock member 13. In the
present invention, such failures are not likely to occur, even
after repeated use, because the fastener member 14 includes a
mounting panel 21, which is a piece of plastic sheeting heat welded
around an extended periphery 22 to the plastic sheeting of the sock
member 13.
Integral with the panel 21, are first and second strap members 22
and 23 respectively. First strap member 22 carries a buckle 24.
Second strap member 23 carries a strip of engagement-fabric 25. A
mating second strip of engagement fabric 26 is mounted in the
central portion of the mounting panel 21.
A major source of failure in this construction is avoided by
spacing the peripheral welded mounting seam 22 away from the area
on which the second engagement fabric strip 26 is attached to the
mounting panel 21. Preferably, this spacing should be not
substantially less than the width of the engagement-fabric strip
26. This provides a portion of welding panel 21 in the peripheral
area entirely around the second strip 26, which is at full
strength, and unaffected by possible irregularities in strength
along the line of the seam 22, at which the welding panel 21 is
attached to the sock member 3.
The cross-sectional view of FIG. 4 reveals the adjustable
positioning and locking of the closure member 14. Second strap 23
is pulled through buckle 24 and pulled back at the fold 31. Second
strap 23 is pulled tight about leg 11, and locked by bringing the
strip 25 into locking engagement with strip 26. It will be seen
that the tightness of closure of closure member 14 may be adjusted
to the comfort of the wearer so as not to shut off blood
circulation in the leg.
It will also be seen that the panel 21 plays an important role in
the comfort of the wearer of sheath 12.
The closure pressure on leg 11 is distributed vertically by the
width of the panel 21 (longitudinally of leg 10). As seen in FIG.
4, most of the sealing closure of closure member 14 around leg 11
is distributed over the relatively wide panel 21. The width of
panel 21 longitudinally with respect to the limb may be
proportioned to the size of sheath 12, to provide water-resistant
sealing without substantial impediment to blood circulation in the
leg or arm, in the case of an arm cast.
It will be understood, that the tubular upper portion 35 of sock
member 13 entirely encloses the surgical cast on the limb of the
user, and that the sealing illustrated in FIG. 4 brings the upper
part of the sock member 13 into direct contact with the fleshf the
leg 11. The cast on the lower part of the limb of the user is thus
entirely protected from moisture during the taking of a shower.
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