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Description  |
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BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a simple blood sampling device.
2. Description of the Related Art
In recent years, the numbers of persons suffering from various diseases
derived from rich dietary patterns and increased stress, for example,
diabetes, have been soaring. Trips to the hospital pose a major
inconvenience to patients in their daily activity, so as examinations of
blood sugar etc. over the course of the regular day become part of the
daily routine, the method of sampling blood has come under attention as a
large problem. The problem of the pain involved in the blood sampling
becomes an even greater problem when it has to be repeated. In particular,
this is becoming a further serious problem in the case of
insulin-dependent patients, many of whom are small children. Further, in
recent years, diseases transmitted through the blood have become social
issues. To prevent AIDS, hepatitus, and other especially serious diseases,
some sort of device which enables patients themselves to sample their own
blood without problem is needed. However, no device has yet been proposed
which enables blood to be sampled painlessly and simply.
SUMMARY OF THE INVENTION
Accordingly, the objects of the present invention are to eliminate the
above-mentioned disadvantages in the prior art and to provide a device
capable of sampling blood in a painless state.
Other objects and advantages of the present invention will be apparent from
the following description.
In accordance with the present invention, there is provided a simple blood
sampling device comprising a vacuum chamber, a skin suction portion, and a
piercing and cutting means.
The present device is extremely simple in construction and further is small
in size and light in weight and also does not use any special parts, so
that the present device is low in price and can be used as a disposable
device.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood from the description set
forth below with reference to the accompanying drawings; wherein:
FIG. 1 is a view showing an example of the present device,
FIGS. 2 and 3 are views for explaining the operation of the example shown
in FIG. 1;
FIG. 4 is a sectional view showing another example of the present device;
FIG. 5 is a bottom view of the example shown in FIG. 4;
FIG. 6 is a sectional view showing another example of the present device;
FIG. 7 is a sectional view showing another example of the present device;
FIG. 8 is a view for explaining the operation of the example shown in FIG.
7; and
FIG. 9 is a view for explaining the case of use of the example shown in
FIG. 7.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The characteristics of the present device will now be explained.
A vacuum suction action is applied to a local portion of the surface of the
skin of the subject (i.e., the living body). Along with this local vacuum
suction, the area inside the subject's skin becomes engorged with blood
and therefore the epidermis expands and rises up. This raised portion of
the skin comes in contact with a piercing means provided at a
predetermined position. Since the raised portion of the skin is
sufficiently taut in state, the piercing means pierces the skin
(epidermis) easily. When the piercing means pierces the skin, the blood
engorged inside it flows out and is collected. Since the skin is locally
drawn up, even though the piercing means pierces the skin, it does so
instantaneously and the sensation of this is cancelled out by the stimulus
caused by the suction action, so no pain is felt. Further, the piercing
and cutting means pierce and cut in an engorged state, so the blood can be
collected painlessly and reliably.
The vacuum chamber shown in the present device is a means for drawing up
the surface of the subject's skin. Ones which perform the vacuum action
mechanically and chemically may be mentioned. While not particularly
limited to them, ampules, cassette devices, etc., which are formed in a
vacuum state in advance by an air-tight material may also be mentioned.
Further, the piercing and cutting means may be one or more solid needles,
hollow needles, needles with sawtooth sides, acupuncture type needles,
etc.
The length of the piercing and cutting means is preferably about several
100 micrometers to several millimeters, but is not particularly limited.
Further, regarding the disposition and construction of the same, the means
may be disposed at the center of the suction portion or the periphery of
the same. It is sufficient if the means can make use of the stretching
action of the epidermis by the vacuum suction to painlessly and
effectively pierce or cut through the epidermis.
EXAMPLES
The present invention will now be further illustrated by, but is by no
means limited to, the following Examples.
FIG. 1 is a view showing one example of the present device.
Reference numeral (11) is a vacuum chamber, which houses a vacuum drive
portion. At the top of the vacuum chamber (11) is provided a switch (16).
By pressing this switch (16), the vacuum operation is performed. Reference
numeral (100) is a hole portion, one or more of which are provided through
the bottom of the vacuum chamber.
Reference numeral (12) is a piercing means, which is formed by, for
example, a fine needle and is provided at the bottom of the vacuum chamber
(11) near the hole portions (100). Reference numeral (13) is a support
member, which is formed as a concentric cylindrical film by plastic,
rubber, paper, or another material having flexibility. The vacuum chamber
(11) is joined to the support member (13) on the top of the same at the
periphery near the approximate center of the concentric portion. Reference
numeral (14) is an adhesive. Use is made of a material which does not
react with the body, such as a material used for adhesive plaster. The
adhesive (14) is provided at the bottom of the support member (13) at the
outer periphery of the same. Examples of such an adhesive are rubber-based
adhesives, acryl-based adhesives, silicone-based adhesives.
Reference numeral (15) is a stopper, which keeps down the elongation and
contraction of the support member (13) at the time of application of
vacuum and assists the skin in being pulled up. The stopper (15) is
provided at the bottom of the periphery of the approximate center of the
concentric portion of the bottom of the support member (13). The material
for the stopper is desirably rubber, plastic, etc. so as to cause large
friction with the skin. Reference numeral (17) is a suction portion, which
portion is formed to cover the inside surface of the concentric portion of
the support member (13) and the bottom portion of the vacuum chamber,
including the piercing means (12) and the hole portions (100).
Next, the operation of the example shown in FIG. 1 mentioned above will be
explained in detail with reference to FIG. 2 and FIG. 3.
First, the above-mentioned example of the present invention is placed, with
the adhesive portion (14) down, on a position of the subject's skin (MMA)
suitable for sampling blood. The adhesive portion (14) adheres to the
subject's skin (MMA), so the device is affixed to the surface of the
subject's skin and the suction portion (17) is sealed. At this time, the
piercing means does not contact the subject's skin.
The switch (16) is depressed. The vacuum chamber thereby begins the vacuum
operation. By this vacuum operation, the suction portion (17) enters a
vacuum state through the holes (100) and a suction action is applied to
the subject's skin under the suction portion (17).
By this suction action, the body fluid, including the blood, inside the
subject's skin (MMA) begins to engorge, forming the engorged position
(MMB).
Gradually, as shown in FIG. 3, the subject's skin under the suction portion
(17) begins to rise up and contacts the piercing means (12). The subject's
skin at this portion, in the pulled up state, is locally taut, so the
piercing means (12) easily pierces the epidermis at the subject's skin
(MMA) and the vacuum reaches the engorged portion (MMB). At this time, the
stopper (15) prevents the movement of the skin under the stopper (15) by a
suction action and assists the surface of the subject's skin being raised
up. The blood and other body fluid travel along the piercing means (12)
and are sucked out to the surface of the subject's skin where they are
collected. In accordance with need, further, the blood sucked out to the
surface of the subject's skin is taken into the inside of the vacuum
chamber (11) through the holes (100).
Finally, the device of this example is taken off the subject's skin surface
(MMA).
Further, FIG. 4 shows a cutting means (121) disposed at the periphery of
the suction portion. When the epidermis is pulled up and stretched by the
vacuum, the surface of the epidermis contacts and slides against the fine
sawtooth edge (122) of the cutting means and is painlessly cut. The
cutting means is formed to have a sawtooth edge construction over all or
part of its edge. FIG. 5 is a view looking at FIG. 4 from the bottom.
Reference numeral (100) is a hole portion, which communicates the vacuum
chamber (11) with the suction portion (17). The rest of the construction
is the same as in FIG. 1, so the same reference numerals are attached and
the explanations are omitted.
Next, another example will be shown in FIG. 6. In FIG. 6, a vacuum drive
portion (not shown) is provided outside and the piercing means is made a
hollow needle.
Reference numeral (11) is a vacuum chamber in the same way as in FIG. 1 and
has a cylindrical shape. Reference numeral (41) is a valve, which moves up
and down in the cylindrical vacuum chamber. Reference numeral (42) is a
friction portion, which is formed at the bottom of the cylindrically
shaped inside of the vacuum chamber (11). Reference numeral (43) is an
opening, which serves as an interface between the inside of the vacuum
chamber and the outside vacuum drive means. The interface of the outside
vacuum drive means is shown by reference numeral (440).
Reference numeral (12) is a piercing means, which is formed by a hollow
needle. The hollow needle reaches into the inside of the vacuum chamber.
Reference numeral (100) is a hole portion, which connects the inside of
the vacuum chamber and the suction portion (17). The rest of the
construction is the same as in the example of FIG. 1 and will therefore
not be explained.
Next, the operation of the example shown in FIG. 6 will be explained.
The device according to this example is placed on the surface of the body.
The adhesive portion (14) is joined to the surface of the body. The
interface (440) of the outside vacuum drive means is connected to the top
of the vacuum chamber. The outside vacuum drive means is driven. The valve
(41) begins to move upward. Since the valve (41) contacts the friction
portion (42), it gradually moves upward. When the valve begins to move
upward, the gas in the suction portion (17) moves upward through the hole
portion (100). At the same time, the subject's skin under the suction
portion (17) rises up and engorges with blood.
Along with the valve (41) moving upward, the skin under the suction portion
(17) rises up. When it passes the friction portion (42), the valve (42)
moves up all at once and the skin under the suction portion (17) rises up
to the maximum extent possible, contacts the piercing member (12), and is
pierced.
When pierced, the piercing means (12) reaches the engorged portion under
the skin. The blood is taken into the vacuum chamber (11) through the
piercing means (12). After the blood is collected, the interface (440) is
removed. The valve (41) falls, but stops at the top of the friction
portion (42), preventing leakage of the collected blood from the hole
portion (100).
Next, a further example will be shown in FIG. 7 and explained.
The device according to this example shown in FIG. 7 is provided with a
vacuum drive portion inside and further has a plurality of piercing means.
Reference numeral (51) is a holding piece which is provided so that a
sliding member A (52) and a sliding member (B) are held at predetermined
positions so as not to separate.
The sliding member A (52) and the sliding member B (53) slide left and
right and are connected by a spring (54). The portion over which the
sliding member A (52) and the sliding member B (53) face each other
constitutes a vacuum space (55).
Reference numeral (12) is a needle, a plurality of which are provided at
the bottom of the vacuum chamber (11). Reference numeral (100) is a hole
portion, of which a plurality are made and which connect the vacuum space
(55) and the suction portion (17). Reference numeral (56) is a peeling
member, which prevents the drying and reduction of tackiness of the
adhesive (14) and which is peeled off at the time of use.
The rest of the construction is the same as in the example shown in FIG. 1
and thus will not be explained.
Next, an explanation will be made of the operation of the example shown in
FIG. 7, including FIG. 8.
At the time of use, the peeling member (56) is peeled off and the device is
placed on the position of the body for drawing the blood. The sliding
member A (52) and the sliding member B (53) are affixed at predetermined
positions by a holding piece (51). At this time, a spring (54) maintains
the compressed state.
Next, the holding piece (51) is removed, as shown in FIG. 6. The sliding
member A (52) and the sliding member B (53) are pushed outward by the
force of the release of the spring (54) and the vacuum space (55) grows in
volume. At the time of adhesion, the suction portion (17) and the vacuum
space (55) were sealed by the subject's skin, so when the vacuum space
(55) grows, the skin under the suction portion (17) is pulled up.
Blood engorges under the skin and the surface rises up. The piercing means
(12) contacts the skin, then pierces through it. When the piercing means
(12) reaches the engorged portion, the blood comes out along the surface
of the piercing means (12) and is thus extracted.
The time waiting for blood to engorge after the skin is drawn up and the
time until the piercing means pierces the skin also may be suitably
selected. Further, it is not that particularly necessary to wait for the
blood to engorge. So long as the skin is pierced by the piercing means in
a state after suction when there is tautness in the skin due to its being
drawn up, the present device operates sufficiently.
Next, the state of one of the examples shown in FIG. 7 adhered to the upper
arm of the body is shown in FIG. 9. Reference numeral (11) shows a vacuum
chamber, and (13) a support member. Since the device is small in size and
light in weight, it may be used adhered in the manner shown in FIG. 9 as
well. Also, the adhesive portion is suitably used. It is also possible to
use the device with no adhesive portion, i.e., held by the hand.
As explained above in detail, the present device is small in size, light in
weight, and low in price and therefore has the effects that it is suited
as a disposable implement and further enables blood to be drawn reliably
etc.
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