U.S. patent number 3,832,993 [Application Number 05/288,501] was granted by the patent office on 1974-09-03 for blood detecting device.
Invention is credited to Wendell V. Clipp.
United States Patent |
3,832,993 |
Clipp |
September 3, 1974 |
BLOOD DETECTING DEVICE
Abstract
A blood detecting device including an elongated, flexible tape
member comprising an electrical insulating member supporting a pair
of electrical conductors connected to a circuit including a source
of electrical energy and an electrically energized signal for
application to an area likely to be exposed to the flow of blood,
such as the body of a human or animal or to conduits of blood in
blood handling apparatus.
Inventors: |
Clipp; Wendell V. (Nashville,
TN) |
Family
ID: |
23107388 |
Appl.
No.: |
05/288,501 |
Filed: |
September 13, 1972 |
Current U.S.
Class: |
600/371;
128/886 |
Current CPC
Class: |
A61B
5/026 (20130101); A61B 5/02042 (20130101); A61B
5/6824 (20130101) |
Current International
Class: |
A61B
5/026 (20060101); A61b 005/00 () |
Field of
Search: |
;128/2.1R,2R,340,235,138A ;340/235 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
|
302,070 |
|
Nov 1917 |
|
DD |
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1,368,884 |
|
Jun 1964 |
|
FR |
|
Primary Examiner: Medbery; Aldrich F.
Attorney, Agent or Firm: Lackey; Harrington A.
Claims
What is claimed is:
1. A blood detecting device comprising:
a. an elongated, flexible tape member, the length of said tape
member being substantially greater than its width, and said tape
member being long enough and flexible enough to wrap spirally
around the limb of a patient or a blood tube,
b. said tape member comprising an elongated, flexible, electrical
insulating strip of substantially uniform width, relatively thin,
and having opposite faces,
c. said tape member further comprising a pair of elongated,
flexible, electrical conductor strips of substantially uniform
width, of substantially the same length as said insulating strip,
and impermeable to fluids,
d. adhesive means permanently fixing said conductor strips on the
opposite faces of, and longitudinally coextensive with, said
insulating strip, so that said conductor strips are spaced opposite
each other and are separated only by the thickness of said
insulating strip,
e. said conductor strips having first longitudinal edges in
alignment along the thickness of said insulating strip, and second
longitudinal edges in alignment along the thickness of said
insulating strip, each of said edges being adjacent and spaced
apart a distance not exceeding said thickness,
f. electrically energizable signal means connected to said
conductor strips,
g. means for supplying an electrical voltage across said conductor
strips, and
h. means for securing said tape member wrapped about the limb of a
patient or a blood tube, likely to be exposed to the flow of blood,
so that the presence of blood between the aligned longitudinal
edges of said conductor strips will short-circuit said conductor
strips to energize said signal means.
Description
BACKGROUND OF THE INVENTION
This invention relates to a blood detecting device, and more
particularly to an electrical blood detecting devide.
Heretofore, the detection of bleeding in human or animal patients,
or the leakage of blood from blood-handling apparatus, has been
detected by human observation. One particular need for such
detection is in the process known as dialysis of patients having
kidney failure. Such detection is necessary, not only upon the
bandaged areas of the patients, but also upon the various conduits
and joints handling the flow of blood in the dialysis machines. The
dialysis process is only one example of numerous situations in
which the automatic detection of blood is needed.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a
blood-detecting device including a insulating member supporting a
pair of spaced conductors which form an open switch in an
electrical circuit including an electrical energy source, such as a
battery, and an electrically energized signal means of any type
whether visual or audible. When the insulating member is secured in
a position where it is exposed to the flow of blood, the liquid
blood bridges the open gap between the conductors. Since blood is
an electrolyte, it electrically closes or short-circuits the
conductors to energize the signal means to warn of the presence of
blood.
The insulating material may be any type of material which supports
the conductors in spaced relationship, and preferably which is
non-toxic. Preferably, the permeable insulating material should be
a flexible fabric, such as cloth or a bandage, so that it may
conform to the area exposed to the possible flow of blood, such as
the limb of a human or animal patient or a blood tube, upon which
the flexible insulating member may be wrapped, or otherwise
secured.
The electrical conductors may be in the form of small aluminum
strips which may be secured by adhesive to a flexible bandage or
other type of insulating fabric.
The signal means and the electrical voltage supply may be small
enough to be portable, or even small enough to be secured directly
to the patient, or they may be large and sophisticated enough to
form the components of an electronic monitoring system for an
entire hospital.
BREIF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of one form of the blooddetecting
device in which all of the components are mounted on the arm of a
human patient;
FIG. 2 is a schematic diagram of a blood-detecting device in which
the signal means is a bell;
FIG. 3 is a section taken along the line 3--3 of FIG. 2;
FIG. 4 is a schematic diagram of a modified form of the invention
in which the signal means is a central alarm system; and
FIG. 5 is a section taken along the line 5--5 of FIG. 4.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings in more detail, the blood-detecting
device 10 made in accordance with this invention includes an
electrical insulating material, which may be permeable to the flow
of blood, such as a flexible sheet of textile fabric in the form of
an elongated gauze bandage strip 11. In FIG. 1, the gauze bandage
strip 11 is long enough to be wrapped about the forearm 12 of a
human patient to cover an incision or wound from which bleeding
would be likely to occur. The gauze bandage 11 may be wrapped upon
itself and secured by any convenient means, such as adhesive tape
13. Bandage clips may also be used if desired.
Fixed to the gauze bandage 11 by any convenient means, such as an
adhesive, to form an elongated, flexible tape member, are a pair of
electrical conductors in the form of aluminum foil strips 14 and
15. These foil strips 14 and 15 are parallel to each other on one
surface of the bandage strip 11 and spaced apart sufficiently that
there will be no electrical contact between the conductors 14 and
15 so long as the bandage 11 is dry. As disclosed in FIG. 1, the
conductor strips 14 and 15 extend the entire length of the bandage
11.
One end of the conductor 14 is connected to an electrode 16, while
one end of the conductor 15 is connected to an electrode 17. Both
electrodes 16 and 17 are connected in the electrical circuit 18.
Connected in series in the electrical circuit 18 is a source of
electrical energy, such as battery 19, and an electrically
energized signal member, such as the electric lamp 20, in FIG. 1.
In FIG. 1, the battery 19 and the lamp 20 are small enough, that is
sufficiently miniaturized, that both may be secured to the forearm
12 adjacent the bandage 11 by a securing member, such as adhesive
tape 21.
Thus, assuming that a medical patient recovering from surgery in a
hospital room has an open wound in his forearm subject to possible
bleeding, then the device 10 is applied to the forearm 12 as
illustrated in FIG. 1. Bandage 11 is wrapped around the forearm
covering the wound and secured by adhesive tape 13, or other
securing means. If the electrodes 16 and 17 are detachable, they
are connected into the circuit 18 and to the conductors 14 and 15.
The battery 19 and lamp 20 are also secured to the forearm 12 by
the adhesive tape 21.
If the patient is awake, but is so anesthetized that he would
normally not feel blood flowing from his wound, and particularly if
the wound was on the backside of his forearm, then the detecting
device 10 would be energized when the blood permeated the bandage
11 sufficiently to electrically bridge the space between the
conductors 14 and 15, thereby closing the circuit 18 and energizing
the lamp 20. The illuminated lamp 20 would call the patient's
attention to his situation, and he could immediately depress the
call-button to summon a nurse to remedy the bleeding.
If the patient is asleep, the illuminated lamp 20 could be observed
by a nurse making her rounds of the rooms. It is also possible that
the heat from the illuminated lamp 20 might be great enough upon
the patient's forearm 12 to awaken the patient and alert him to the
bleeding.
FIG. 2 discloses a modified detecting device 30 including all of
the elements of the device 10 except that a bell 24 has been
substituted for the lamp 20. The bell 24 could be small enough to
be mounted on the patient's arm in a manner similar to the device
10 in FIG. 1, or it could be a larger bell adapted to be mounted in
any position where it could be heard by the patient, or by the
nurse. The bell 24 could even be located at a remote location for
centralized monitoring.
The circuit 18 could also be energized by the substitution of an
electrical connector, in place of the battery 19, which could be
inserted in a mating receptor in the existing house circuit. Of
course, if the house circuit is A.C., then a transformer must be
included in the circuit 18 in order to convert the A.C. current to
D.C. current if the signal member is D.C.-operated.
FIG. 4 discloses a modified detector 40 in which any type of
central alarm system 25 is substituted for the lamp 20 or the bell
24 for monitoring at a remote station. Also, in the device 40, the
conductors 14' and 15' (FIG. 5) are fixed on opposite sides or
faces of the gauze sheet 11 so that the conductors 14' and 15' are
separated only by the thickness of the bandage 11 to form an
elongated, flexible tape member. Of course, the conductors 14' and
15' could be staggered on opposite sides of the bandage 11 to
increase the spacing between conductors to make it less
sensitive.
The detecting device 10 would also be adaptable for applying to
wounds on animals so that any bleeding of the animal could be
detected by visual or audible means, even when the animal is not in
the immediate vicinity of its master or the veterinarian.
The flexible insulating member 11 could be of any other material
adaptable for wrapping conduits or tubes through which blood flows
in machines or apparatus adapted for the handling of blood, such as
a dialysis machine. A detector device, such as 10, could be
positioned in areas of particular vulnerability, such as connecting
joints which might accidentally become loosened, or about blood
tubes in which the walls are unusually thin to detect possible
rupture of the tube. Such devices would be invaluable for
blood-handling machines, such as dialysis machines, where they are
installed in the home, and where only limited personnel are
available for observing and monitoring the machine.
Devices such as 10, 30 and 40 could also be applied to blood
containers at sensitive or vulnerable points to leakage, in storage
or in actual use.
It will also be understood that numerous types of signal devices
could be used in addition to electric lamps and bells, such as
various types of electronic sound-emitting devices, or an
electrically energized shocking device to be applied to some
portion of the patient's body to provide a stimulating warning.
It is also important that all of the components, particularly the
insulating member, conductors and electrodes be sterile and
non-toxic to blood.
* * * * *