U.S. patent number 3,727,658 [Application Number 05/182,731] was granted by the patent office on 1973-04-17 for receiver for surgical implements.
This patent grant is currently assigned to Instranetics, Inc.. Invention is credited to John D. Eldridge, Jr..
United States Patent |
3,727,658 |
Eldridge, Jr. |
April 17, 1973 |
RECEIVER FOR SURGICAL IMPLEMENTS
Abstract
A receiver for surgical implements which includes a backing
sheet of a foamed elastomer, the back side of which is exposed to
provide frictional contact with an underlying surface. A plurality
of magnetic bars are disposed on the upper surface of the pad
backing sheet to receive and retain surgical implements. An
impervious plastic cover sheet, coextensive with the backing sheet,
conforms to the magnetic bars and adheres to the upper surface of
the backing sheet between the magnetic bars. The receiver is
capable of being folded to entrap discarded surgical implements
between the folded portions of the receiver. The receiver may also
be rolled to entrap discarded surgical instruments, or the
implements may first be removed to permit the rolled receiver to be
sterilized for reuse.
Inventors: |
Eldridge, Jr.; John D.
(Anaheim, CA) |
Assignee: |
Instranetics, Inc. (Los
Angeles, CA)
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Family
ID: |
22669768 |
Appl.
No.: |
05/182,731 |
Filed: |
September 22, 1971 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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868317 |
Oct 22, 1969 |
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Current U.S.
Class: |
206/370; 128/852;
335/303; 206/63.3; 206/382 |
Current CPC
Class: |
A61B
50/362 (20160201); H01F 7/0215 (20130101); A61F
2210/009 (20130101) |
Current International
Class: |
A61B
19/02 (20060101); A61B 19/00 (20060101); A61F
2/00 (20060101); A61b 019/00 () |
Field of
Search: |
;150/52R
;206/DIG.33,63.2R ;128/132D ;335/302,303,306 ;248/26A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Norton; Donald F.
Parent Case Text
This application is a continuation-in-part of my co-pending
application Ser. No. 868,317, filed Oct. 22, 1969, now abandoned,
for RECEIVER FOR DISPOSABLE SURGICAL IMPLEMENTS.
Claims
I claim:
1. A receiver for magnetizable implements, comprising:
a. a supporting pad of uniform thickness including two similar
portions movable between a coplanar position and a folded mutually
confronting position, the portions, when in their coplanar
position, adapted to present an upwardly facing surface on which
magnetizable implements may be deposited;
b. a set of magnet elements mounted on each of the confronting
surfaces, for mutual adhering engagement, when the pad is folded;
the magnetic elements being in the form of thin strips and their
poles being formed at their exposed surfaces, and their surfaces
facing the pad.
2. A receiver as defined in claim 1, wherein:
a. each magnet element includes a pair of contiguous magnet
portions of opposite polarity, and a magnetizable strip underlying
and bridging between both portions to define a magnetic circuit
capable of completion by a magnetizable implement placed across the
contiguous magnet portions.
3. A receiver as defined in claim 1, wherein:
a. the supporting pad is formed of porous elastomeric material
having a frictionally clinging back surface;
b. and an impervious sheet covers the front surface of the
supporting pad intimately enclosing the magnet units and adheres to
the supporting pad between the magnet units.
4. A receiver as defined in claim 3, wherein:
a. the supporting pad is rollable as well as foldable, and the
magnet units form spacers, when the supporting pad is rolled for
entrance of a sterilizing media.
5. A receiver for magnetizable implements, comprising:
a. a backing sheet of porous foamed elastomeric material having a
frictionally clinging back surface;
b. a plurality of spaced magnet units disposed on the front surface
of the backing sheet and extending above the normal surface of the
backing sheet;
c. and an impervious covering closely enveloping the magnet units
and intimately contacting the front surface of the backing sheet
between the magnet units;
d. each magnet unit including a magnet element formed of plastic
material impregnated with magnet particles and a magnetizable metal
strip coextensive therewith underlying the magnet element.
6. A receiver as defined in claim 5, wherein:
a. each magnetic element includes two portions of opposite polarity
both in contact with the metal strip and forming therewith a
magnetic circuit when a magnetizable implement is placed across
their outer surfaces.
7. A receiver as defined in claim 5, wherein:
a. the receiver is rollable into a cylindrical bundle, the magnet
units forming spacers to permit access of a sterilizing media into
the porous back side of the backing sheet and the front surface of
the impervious covering.
8. A receiver as defined in claim 5, wherein:
a. the receiver is foldable to place opposing poles of pairs of
magnet units in confronting relation.
9. A supporting means for surgical implements, comprising:
a. a supporting member having a foamed plastic lamination;
b. a set of magnetic elements mounted in spaced relation on the
supporting member, the magnetic elements being in the form of thin
strips with their poles being at their exposed surfaces and at
their surfaces facing the pad;
c. and a thin impervious plastic lamination encasing the magnetic
elements and bonded to the surface of the supporting member.
Description
BACKGROUND OF THE INVENTION
The use of disposable surgical implements such as hypodermic
needles, suture needles, knives and similar small sharp implements
is increasing rapidly with the attendant increasing problem of
their control. That is the increased number of implements must be
carefully accounted for. If the implements are dropped or misplaced
out of the sterile area, are are needed for reuse, they require
resterilization. In the case of an essential surgical implement the
resterilization may be required prior to completion of surgery. For
example, numerical control of surgical needles, both the reusable
and disposable types, become mandatory. In fact, legislation now
pending may require a count of all needles and related implements
employed prior to surgical closure.
Also, attempts have been made to provide surgical pads utilizing
magnets; for example, U.S. Pat. No. 3,546,643, in which a rubber
pad is perforated to provide magnet receiving pockets, and, after
placement of the magnets, is covered on both sides with fabric
reinforced sheets. This construction is relatively expensive and
thus must be used repeatedly and be capable of withstanding
repeated sterilization.
Another example is U.S. Pat. No. 3,483,494. In this case, the
magnets are encased between two impervious sheets.
SUMMARY OF THE INVENTION
The present invention is directed generally to the same purpose as
the cited patents, that is, to a receiver for surgical implements
but which incorporates important improvements, the invention being
summarized in the following objects:
First, to provide a receiver for surgical implements which includes
a backing sheet of porous foamed elastomeric material on which is
placed a plurality of magnetic bars covered by a vacuum formed
cover sheet conforming closely to the magnets and adhering to the
backing sheet therebetween; the back surface of the backing sheet
being normally flat yet capable of conforming to and frictionally
clinging to an underlying surface, and the magnet bars providing
raised upper surfaces to provide improved access to surgical
implements for removal if desired.
Second, to provide a receiver for surgical implements as indicated
in the preceding object wherein the magnetic bars are formed of
plastic material impregnated with magnetized particles so oriented
as to provide a pair of contiguous magnetic zones of opposite
polarity at their upper and lower surfaces, these being coupled by
an underlying magnetically permeable metal strip, whereby a metal
implement placed across a single bar completes a magnetic circuit
and provides a retentive force independent of the other magnetic
bars.
Third, to provide a receiver for surgical implements, which in one
embodiment is intended primarily for small disposable surgical
implements, and foldable to entrap the implements between magnetic
bars, the magnets tending to place the implements parallel to the
planes of the folded portions of the receiver to minimize the
chance of puncture of the cover sheet and backing sheet, thereby
providing a discardable package.
Fourth, to provide a receiver for surgical implements in which
another embodiment is intended primarily for use as a relatively
large surgical drape which is placed over a patient and may be
arranged for use as an expendable receiver for disposable
implements or as a reusable receiver for reusable surgical
implements.
Fifth, to provide a receiver for surgical implements, as indicated
in the preceding objects, which is capable of being rolled into a
cylindrical bundle, the magnetic bars serving to space the
convolutions to expose the porous back side as well as the front
side to a sterilizing media.
DESCRIPTION OF THE DRAWINGS
FIG 1 is a plan view showing one embodiment of the receiver for
disposable surgical implements, the receiver being shown in its
open position.
FIG. 2 is an edge view of the receiver in its open position.
FIG. 3 is a plan view of the receiver shown in its folded
position.
FIG. 4 is an edge view of the receiver shown in its folded
position.
FIG. 5 is a fragmentary substantially enlarged sectional view taken
through 5--5 of FIG. 1.
FIG. 6 is a fragmentary plan view of another embodiment of the
receiver.
FIG. 7 is an enlarged fragmentary plan view thereof taken within
circle 7 of FIG. 6 with successive layers partially removed to
illustrate the internal construction.
FIG. 8 is an enlarged fragmentary sectional view taken through 8--8
of FIG. 6 showing a portion of the receiver in its folded
condition.
FIG. 9 is a perspective view of one of the magnet bars.
FIG. 10 is a fragmentary end view of the receiver in a rolled
condition.
Reference is first directed to FIGS. 1 through 5. The receiver here
illustrated includes a pad 1 formed of a sheet of porous foamed
plastic material. In the construction shown, the plastic material
may be a soft or may be a rigid foamed plastic readily foldable
elastomeric material such as foamed polyurethane. For example, a
polyurethane, open cell sheet with 70 to 100 pores per lineal inch
has been found satisfactory. The higher the number of pores, the
greater the coefficient of adhesion to the surface on which the
receiver mat or pad is placed. Thickness of the foam backing pad
may range between 1/16" and 1/8". Such foam material is light in
weight. Example, a square foot of 1/8" foam weights about 1/4 oz.
Placed on the pad 1 is a set of magnets 2. It has been found
convenient to use magnets formed of sintered magentic particles
suitable bonded together by plastic material. For example, magnets
formed of nitrile rubber embedded with particles of ferromagnetic
material such as barrium ferrite, a material which is lighter in
weight than metal magnets, has been found to be highly
satisfactory. Magnets of this type may be polarized so that the
undersurface which rests on the pad constitutes one pole, whereas,
the upper or exposed surface constitutes the other pole. Magnets of
this type may be cut to form elongated strips and are placed on the
pad in parallel spaced relation. The magnetic strength may be
increased by interposing a magnetizable backing strip 3 under each
magnet, as indicated in FIG. 5.
The magnets 2 are held in place on the pad 1 by an impervious thin
plastic laminate 4, which is vacuum formed around each magnet, due
to the porosity of the pad or backing sheet, and is drawn into
intimate contact with the pad between the magnets by the
application of suction pressure under the pad. While many of the
thin sheet plastics may be used, it has been found convenient to
use an Ionomer; that is, a plastic sheet in which the polymer is
linked by ionic forces and covalent bonds. It has been found that
such a laminate bonds to the foamed plastic without the application
of adhesive. However, an adhesive coating may be used if
desired.
The receiver illustrated in FIGS. 1 through 5 is used as
follows:
The primary application of the receiver shown in FIGS. 1 through 5
is in the operating room. The receiver is placed in its open
position, as illustrated in FIG. 1, at a location convenient to the
surgeon or his nurse. Each implement, indicated by 5, is discarded
by placing the implement on the receiver. The magnets tend to hold
the implement in place so as not to be lost. This is important for
careful check of the implements is maintained and they are counted
when surgery is completed. The implements may include hypodermic
needles, suture stitching needles, and various expendable surgical
knives.
When surgery is completed, the two halves of the receiver are
folded together so that the magnets on each half of the receiver
are moved into confronting relation, with the implements between
the confronting pairs of magnets. The attraction between the
magnets is of greater force than the attraction between an
implement and the magnet. As a result, the implements are firmly
held in place. Should an implement be laid over the region in which
the receiver folds, the folding operation merely moves the
implement to one side.
Reference is now directed to the embodiment shown in FIGS. 6
through 10. The construction here shown is intended primarily as a
surgical drape or as a mat for placement on a surgical drape. This
embodiment includes a backing sheet or pad 6 which, except for
size, is the same as the backing pad 1 and has a strong tendency to
cling frictionally to and conform with an underlying drape.
Placed on the backing pad 6 are columns and rows of magnet units 7
which individually may be smaller than the magnets 2. Each magnet
unit 7 may include a pair of magnetic bars 8 and 9 which may be
separate members or joined integrally along their contiguous sides.
In either case, the magnetic bars 8 and 9, like the magnets 2, are
formed of plastic material impregnated with permanently
magnetizable particles or may be formed of the material indicated
in reference to the magnet units 2. These particles are so
magnetized that the bars or portions 8 and 9 have opposite polarity
as indicated by N and S in FIGS. 8 and 9.
Interposed between the bars comprising portions 7 and the backing
sheet 6 is a permeable magnetizable strip 10, so that with the
placement of a magnetizable implement over the portions 8 and 9 a
magnetic circuit is completed independently of any of the other
magnetic units 7, thus maximizing the holding power.
The embodiment shown in FIGS. 6 through 10 functions essentially in
the same manner as the embodiment shown in FIGS. 1 through 5. Both
utilize a porous backing pad or sheet to increase the frictional
contact with an underlying surface. The latter embodiment is
intended primarily as a drape which can be placed over a patient
and conform as well as cling to the patient to prevent slippage.
Because of the larger size and its use as a drape, the embodiment
shown in FIGS. 6 through 10 may be used to receive reusable
surgical implements which are removed after use.
While it is intended that the drape construction be expendable with
any expendable implements remaining thereon, the drape construction
is capable of being rolled as indicated in FIG. 10 in which case
the magnet units 7 serve as spacers to insure access of a
sterilizing media to the impervious front surface of the drape as
well as throughout the pores of the backing sheet 6.
In regard to both embodiments shown, the metal backing strip
reinforces the otherwise flexible magnet strips or bars to prevent
flexing, as flexure of the magnets would tend to dislodge
implements held magnetically thereon. Also, the metal strips block
the magnetic field from extending through the back of the mat or
pad. This is important in that, when the mat or drape is rolled,
the back-to-front relationship of the magnets, particularly with
the arrangement shown in FIGS. 8 and 9, minimizes magnetic
adherence between the magnet units. This, plus the spacing effect
of the magnet units, facilitates sterilization, preferably at
ambient temperature by radioactive cobalt or ethylene oxide gas.
When the mat or pad is folded, high magnetic relationship may be
attained as indicated in FIG. 8, to retain the implements, or for
packing. Minimal magnetic relation may be attained by positioning
the magnet units in offset relationship. It has been found that the
impervious cover film may be quite thin and yet permit vacuum
forming. A polyethylene film of 0.020 to 0.040 inches thick has
been found satisfactory. Also, this material may be formulated so
as to be static free.
Finally, considerable weight reduction is attained by utilizing the
foamed backing sheet plastic magnets and thin metal strips, i.e., a
10" .times. 16" size drape weighs about 4 ounces, whereas the
previous magnetic drapes of this size weigh more than 1 pound.
While particular embodiments of this invention have been shown and
described, it is not intended to limit the same to the details of
the constructions set forth, but instead, the invention embraces
such changes, modifications, and equivalents of the various parts
and their relationships as come within the purview of the appended
claims.
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