JPH06327655A - Apparatus for drawing blood - Google Patents

Abstract

(57) [Summary] [Purpose] Puncture the skin at a high puncture speed, suck the punctured blood in the required amount, eliminate the negative pressure during blood suction, and collect blood without scattering. A housing 1 having openings at both ends and a lancet portion 6 capable of sliding on an inner wall of the housing 1 are provided at a tip end, and an opposite side thereof is provided with a locking portion 12 and a gasket 7 provided on the inner wall of the housing 1. It extends through the communication passage 21 into the plunger inner chamber 4 of the plunger-2, and the rear end thereof is the inner chamber 4
A lancet holder-3 consisting of a flange 5 capable of sliding on the inner wall of the housing, and a plunger-2 having at the tip a gasket 7 capable of sliding on the inner wall of the housing 1 behind the locking portion 12.
And the locking portion 12 in the middle of the lancet holder-3.
Is provided between the engagement swelling portion 15 and the first spring 8 provided between the engagement portion 12 and the lancet portion 6, and the plunger inner chamber 4 and the flange 5. The third spring
A blood sucking device including 20 and an intake hole 22 for sucking outside air into the housing inner chamber 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood sucking device for sucking a small amount of blood punctured into the skin of a human body and flowing out in a small amount.

[0002]

2. Description of the Related Art A lancet syringe generally comprises a cutting edge having a sharp tip and a pressing portion on the opposite side for puncturing the skin of a human body, and the cutting edge is tapped to tap the cutting edge. Is punctured by the skin of a human body, for example, a finger, and a small amount of blood flowing out from the punctured site is collected by a pipette or a capillary tube and used for various blood tests. However, since blood vessels are concentrated in the finger, small droplets of blood can be squeezed out, but since considerable pain is concentrated in the finger, it is necessary to puncture the upper arm, abdomen, thigh, etc. with a lancet syringe in recent years. A method of collecting a large amount of blood is used. For example, in JP-A-62-38140, after puncturing the skin with a lancet support having a gasket that slidably slides in the tube, the negative pressure generated in the tube when the support returns due to the spring force is applied. There has been proposed a blood sampling device that draws blood by utilizing it.

[0003]

However, this device has a gasket fixed to the lancet support,
Due to the friction of the gasket provided to make the inside of the tube airtight against the inner wall, the puncture speed of the lancet at the time of puncturing the skin becomes slow, and there is a drawback that pain at the time of puncturing the skin increases.
In addition, since the device automatically locks the lancet support in the state where the skin is pulled by negative pressure after puncture,
When the skin is under negative pressure and the tip of the tube is pulled away from the skin, a rapid recovery of the pulled skin and the entry of outside air into the tube cause blood droplets to scatter around, so an extra amount of blood must be collected. It has a drawback that cannot be achieved. An object of the blood aspiration device of the present invention is to provide a blood aspiration device for puncturing the skin at a high puncturing speed, eliminating negative pressure during blood aspiration, and collecting only a necessary blood volume.

[0004]

That is, according to the present invention, a housing 1 having openings at both ends and a lancet portion 6 capable of sliding on the inner wall of the housing 1 are provided at the tip, and the opposite side is provided on the inner wall of the housing 1. The lancet holder-3, which extends through the provided engaging portion 12 and the communication passage 21 of the gasket 7 into the plunger-inner chamber 4 of the plunger-2 and whose rear end is a flange 5 which can slide on the inner wall of the inner chamber 4. A plunger-2 having at its tip a gasket 7 capable of sliding on the inner wall of the housing 1 behind the locking portion 12; and an engaging member engaged with the locking portion 12 in the middle of the lancet holder-3. From the bulging part 15, the first spring 8 provided between the locking part 12 and the lancet 6, and the third spring 20 provided between the plunger inner chamber 4 and the flange 5. The blood sucking device Suction holes 22 for intake of the outside air is a blood suction device consisting provided in the chamber 10 Managing. Further, the present invention is the above-mentioned blood suction device, wherein a second spring 9 is installed between the locking portion 12 and the gasket 7. is there. Further, according to the present invention, in the blood sucking device, the blood sucking device is provided with a ridge portion 17 for preventing the puncture needle 16 of the lancet portion 6 from advancing on the inner wall of the housing 1 or the cap portion 13 at least 1 mm behind the opening 14. It is an instrument.

[0005]

[Function] The lancet part is fixed in the housing by pulling the plunger that slides on the inner wall of the housing 1 outward until the engaging expansion part of the lancet holder engages with the locking part. At this time, the first spring is in a contracted state. Then, after pressing the opening of the housing against the skin, the second spring is contracted by pushing the plunger forward, and further by pushing it forward, the engagement bulge is disengaged from the locking portion and the lancet portion is released. The puncture portion moves from the opening at the tip of the housing to the outside to puncture the skin of the human body. At this time, the second spring remains contracted, but the first spring
The spring is in a stretched state. Then, by releasing the force of the plunger pushed forward, the plunger slides inside the housing and retracts backward. At this time, the first spring and the second spring expand, the inner chamber of the housing is in a decompressed state by the gasket that airtightly slides and retreats rearward on the inner wall of the housing, and the blood is sucked from the place where the skin is punctured. When the amount of blood required for the blood test is reached while observing with a transparent tube at the tip of the housing, by opening the closed intake hole, outside air is sucked into the plunger inner chamber, and the housing passes through the communication passage of the gasket. After entering the inner chamber, the negative pressure state of the inner chamber of the housing becomes normal pressure. As a result, the sucking of blood is stopped, the skin pulled and expanded by the negative pressure returns to the normal state, and the skin adsorption at the housing opening is released.

[0006]

EXAMPLES An example of the present invention will be described below with reference to examples. 1 is a cross-sectional view of the blood aspiration device of the present invention, FIGS. 2 to 7 are explanatory views showing an operation procedure of the blood aspiration device of FIG. 1, and FIG. 8 is a cross-sectional view showing an example of an intake hole. In the figure, 1 is a housing, 2 is a plunger, 3 is a lancet holder, 4
Is a plunger inner chamber, 5 is a gasket, 6 is a lancet portion, 7 is a gasket, 8 is a first spring, 9 is a second spring, 10
Is an inner chamber of the housing, 11 is a lancet connecting portion, 12 is a locking portion, 13 is a tip cap, 14 is an opening portion, 15 is an engaging expansion portion, 16
Is a puncture needle, 17 is a ridge, 18 is a lancet body, 19 is a plug, 20 is a third spring, 21 is a communication passage, and 22 is an intake hole.

FIG. 1 shows a tip cap on the tip of the housing 1.
FIG. 6 is a cross-sectional view of the blood suction device before the puncture needle 16 is punctured in the skin with the lancet portion 6 attached to the lancet portion 6 and the lancet portion 6 attached. The lancet portion 6 includes a puncture needle 16 and a lancet body 18 to which the puncture needle 16 is attached. By attaching the tip caps 13 to the tips of the housing 1 having openings at both ends, the lancet portion 6 is arranged inside the housing 1, so that the puncture needle 16 does not accidentally injure the human body. The tip cap 13 is preferably a transparent tube for observing that the amount required for blood test is reached when the blood is sucked from the place where the skin is punctured. The lancet body 18 having the puncture needle 16 can be replaced and used when collecting blood. At least 1 from the opening 14 of the tip cap 13
A ridge 17 is installed on the inner wall at the rear of the mm, and when the puncture needle 16 of the lancet portion 6 jumps outward from the opening 14, the puncture needle 16 is locked by the tip of the lancet connection portion 11. It acts to suppress the area of skin puncture.

The lancet holder-3 is installed inside the housing 1, and the lancet portion 6 is attached to the tip of the lancet holder-3.
The opposite side is a locking portion 12 provided on the inner wall of the housing 1.
Also, it extends to the plunger inner chamber 4 via the communication passage 21 of the gasket 7. The rear end of the lancet holder-3 is provided with a flange 5 that can slide on the inner wall of the plunger inner chamber 4. The plunger inner chamber 4 and the housing inner chamber 10 are communicated with each other through a communication passage 21 of the gasket 5, and the outside air from the intake hole 21 has a negative pressure.
Is supplied to the inside of the housing to bring the inside pressure of the housing to normal pressure, thereby stopping the suction of blood. A rubber elastic body or plastic is used as the material of the flange 5.

A locking portion 12 is provided on the inner wall of the housing 1, and the lancet portion 6 is located at the tip end side of the locking portion 12.
Engagement bulge provided on the lancet holder-3 between
The lancet holder 3 is fixed by engaging with the lancet holder 3, and has a function of preventing the lancet portion 6 from largely moving outward from the opening 14 of the housing 1. The plunger-2 is installed so as to be slidable on the inner wall behind the locking portion 12 of the housing 1, and a gasket 7 is attached to the tip end thereof to be airtight with the inner wall of the housing 1. A communication passage 21 is formed in the central axis of the gasket 7, and the lancet holder-3 extends from the housing inner chamber 10 through the communication passage 21 to the plunger inner chamber 4. A rubber elastic body is usually used as the material of the gasket 7, and the gasket 7 is airtight with the inner wall of the housing 1 to prevent atmospheric air from entering the housing inner chamber 10 from the rear outside. The rear end of the plunger-2 closes the opening of the plunger inner chamber 4 with a plug 19.
A rubber-like elastic body is used as the material of the plug body 19. The rear end of the plunger-2 is arranged outward from the rear opening of the housing 1.

The intake hole 22 for sucking the outside air may be installed in either the housing 1 or the wall portion of the plunger-2. However, the intake hole 22 is provided in the plug body 19 to connect the plunger inner chamber 4 to the communication passage 21. Atmosphere is preferably introduced into the housing inner chamber 10 via The intake hole 22 is closed during the operation of the blood suction device of the present invention, and the housing inner chamber 10 is under negative pressure.
It is preferably opened when the outside air is taken in and returned to normal pressure. FIG. 8 is a sectional view showing an example of an air intake hole used in the blood suction device of the present invention. A base plate 25, to which an elastic sheet 23 for closing the air intake hole 22 is attached, is fixed to a middle portion of the base member 24 at its base end by a protruding portion 26 of the plug body 19.
The intake hole 22 is closed. When the outside air is sucked into the plunger inner chamber 4, the lid 24 is opened and the outside air is introduced into the plunger inner chamber 4 through the intake hole 22, so that the housing inner chamber 10, which has a negative pressure, is kept under normal pressure. Return to.

The gasket 7 preferably has a small sliding resistance when the plunger-2 moves back and forth on the inner wall of the housing 1. The gasket 7 preferably has a product of compressibility and contact area of 100 to 300, which is disclosed in JP-B-57-26782. The first spring 8 is installed between the locking portion 12 and the lancet connecting portion 11, and the puncture needle 16 momentarily punctures the skin. Also, a third spring is installed between the flange 5 and the rear exit of the communication passage 21 of the gasket 7,
Housing 1 with a puncture needle that punctured the skin and jumped out
Immediately pulls back inside. Further, when the second spring 9 is installed between the locking portion 12 and the gasket 7, a force for releasing the engagement bulging portion 15 engaged with the locking portion 12 from the locking portion 12 is obtained. A force to move the plunger-2 rearward is exerted, which is convenient for adjusting the suction amount of blood obtained by puncturing.

2 to 7 are explanatory views showing the operating procedure of the blood suction device of the present invention. FIG. 2 shows a blood suction device in which the lancet connecting portion 11 is exposed to the outside by the first spring 8 extending from the front end opening of the housing 1. At this time, the second spring 9 is also in the expanded state. The drawing in which the lancet portion 6 is attached to the lancet connection portion 11 and then the tip cap 13 is attached to the tip of the housing 1 and the puncture needle 16 is housed in the housing 1 is shown in FIG.
Is. 1 and 2, the case where the lancet portion 6 is replaced and the blood suction device is used has been described. However, when the blood suction device is used once, the housing 1 is integrated with the distal end cap 13 as well. It can be used after molding. In this case, the protrusion 17 is provided at least 1 mm behind the tip opening 14 of the housing 1 as in the case of the tip cap 13.

Next, pull the plunger-2 backward,
FIG. 3 shows a state in which the engagement bulging portion 15 of the lancet holder 3 is moved rearward to be engaged by the locking portion 12 and the lancet portion 6 is fixed. At this time, the second spring 9 is expanded and remains unchanged, but the first spring 8 is in a contracted state. The opening 14 of the housing 1 may be pressed against the skin even in the state of FIG. 2, but the blood suction device is operated in the state of FIG. 3 and then the opening 14 of the blood suction device is pressed against the skin. Good. When the opening 14 is pressed against the skin, the surrounding area can be pressed to relieve the pain when the skin is punctured by the puncture needle 16. With the lancet portion 6 fixed in the housing 1, the second spring 9 is contracted and the flange 5 is connected to the communication passage 21 of the gasket 7 by moving the plunger-2 in the distal direction. And the interior of the plunger inner chamber 4 is moved rearward. At this time, the contracted third spring 20 is expanded.

When the blood suction device shown in FIG. 4 is pushed further in the distal direction, the engagement bulging portion 15 engaged with the engaging portion 12 is released into the second spring 9.
The lancet portion 6 vigorously pops out in the distal direction by the force of the contracted first spring 8 which is disengaged from the locking portion 12 due to the pressure of the above, and the puncture needle 16 instantaneously punctures the skin from the opening portion 14. FIG. 5 shows the state. At this time, the flange 5 which is located in the rear of the plunger inner chamber 4 also moves to the front of the plunger inner chamber 4 as the lancet holder-3 moves toward the front end, and the third spring 20 which is in the expanded state contracts. Therefore, when the puncture needle 16 momentarily punctures the skin, the third spring 20 immediately expands, the lancet holder-3 moves rearward, and the puncture needle 16 is stored in the housing 1. At this time, the first spring 8 is expanded, but the second spring 9 is held in a contracted state.

Next, the plunger-2 is moved backward while the opening 14 of the housing 1 is pressed against the skin. FIG. 6 is a drawing showing this state. This operation may be performed manually, but since the second spring 9 is contracted in FIG. 5,
When the force pushing the plug 20 at the rear end of the plunger-2 is released, the second spring 9 automatically extends and the plunger-2 moves rearward. This state is shown in FIG. The gasket 7 at the tip of the plunger-2 is airtight with the inner wall of the housing 1, and since the opening 14 of the housing 1 is in close contact with the skin, the housing inner chamber 10 is in a sealed state. As a result, the plunger-2 moves rearward, so that the housing inner chamber 10 has a negative pressure, and blood can be sucked out from the portion punctured in the skin. The negative pressure of the housing inner chamber 10 can be adjusted by the distance of moving the plunger-2 rearward, but it is usually 50 for atmospheric pressure of 760 mmHg.
It is 0 mmHg or less, preferably 200 to 350 mmHg. As for the amount of blood to be sucked out, the amount of blood required for the blood test can be collected by operating the plunger-2 while observing the transparent tip cap 13.

When it is confirmed that the blood amount necessary for the blood test has been collected, the lid 24 is separated from the stopper 19 to open the closed intake hole 22 as shown in FIG. The housing inner chamber 10, which has been under pressure, inhales the outside air and returns to normal pressure, and the suction of blood from the skin is completed. When the intake hole 22 is provided in the plug body 19, the outside atmosphere is closed to open the intake hole 22 so that the flange 5 and the plunger 5 are released from the inner chamber 4 of the plunger.
The housing inner chamber 10 passes through the gap with the inner chamber 4 and the communication passage 21.
Then, the negative pressure in the housing inner chamber 10 becomes normal pressure. When the housing inner chamber 10 returns to normal pressure, the opening 14 of the housing 1 that was in close contact with the skin is easily separated and the collected blood does not scatter around.

[0017]

The blood suction device of the present invention can puncture the skin at a high puncturing speed, so that blood can be collected with almost no pain. Moreover, since blood can be collected by sucking blood after puncturing the skin, it is possible to collect blood even from a place with low blood vessel density.
Further, the negative pressure in the housing inner chamber at the time of sucking blood can be released to collect only a necessary amount of blood, and blood is not scattered around when the opening of the housing is separated from the skin.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a blood suction device of the present invention.

FIG. 2 is an explanatory view showing an operation procedure of the blood suction device.

FIG. 3 is an explanatory view showing an operation procedure of the blood suction device.

FIG. 4 is an explanatory view showing an operation procedure of the blood suction device.

FIG. 5 is an explanatory diagram showing an operation procedure of the blood suction device.

FIG. 6 is an explanatory view showing an operation procedure of the blood suction device.

FIG. 7 is an explanatory view showing an operation procedure of the blood suction device.

FIG. 8 is a sectional view showing an example of an intake hole.

[Explanation of symbols]

 1 Housing 2 Plunger 3 Lancet Holder-4 Plunger Inner Chamber 5 Gasket 6 Lancet Part 7 Gasket 8 First Spring 9 Second Spring 10 Housing Inner Chamber 11 Lancet Connection Part 12 Locking Part 13 Tip Cap 14 Opening 15 Engagement Bulging part 16 Puncture needle 17 Ridge part 18 Lancet body 19 Plug 20 Third spring 21 Communication passage 22 Air intake hole

Claims (3)

[Claims] 1. A housing 1 having openings at both ends, a lancet portion 6 capable of sliding on an inner wall of the housing 1 is provided at a tip end, and a locking portion 12 and a gasket provided on the inner wall of the housing 1 on the opposite side thereof. A lancet holder-3, which extends through the communication passage 21 of No. 7 into the plunger inner chamber 4 of the plunger-2 and has a rear end formed of a flange 5 capable of sliding on the inner wall of the inner chamber 4, and the rear of the locking portion 12. A plunger-2 having a gasket 7 at its tip which can slide on the inner wall of the housing 1, an engaging bulge 15 engaged with the engaging portion 12 in the middle of the lancet holder-3, and the engaging A blood suction device comprising a first spring 8 provided between the portion 12 and the lancet 6 and a third spring 20 provided between the plunger inner chamber 4 and the flange 5 in a housing inner chamber
A blood suction device in which an air intake hole (22) for inhaling outside air is provided in the inside (10). 2. A second portion is provided between the locking portion 12 and the gasket 7.
The blood suction device according to claim 1, wherein a spring 9 is installed. 3. The ridge portion 17 for preventing the puncture needle 16 of the lancet portion 6 from advancing is provided on the inner wall of the housing 1 or the cap portion 13 at least 1 mm behind the opening portion 14. Blood suction device.