JP2949696B2 - Lancet syringe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable and non-reusable lancet syringe for use in a blood test in which a small amount of blood is punctured by puncturing the skin of a human body.

[0002]

2. Description of the Related Art A lancet syringe generally has a cutting edge having a sharp point and a pressing portion on the opposite side for piercing the cutting edge into the skin of a human body. Is punctured into the skin of a human body, for example, a finger, and a small amount of blood flowing out of the punctured site is collected by a pipette or a capillary and used for various blood tests. In the conventional lancet syringe, the operator first removes the protective cover from the lancet syringe, and then punctures the exposed blade into the skin of the human body to collect blood. Various lancet syringes have been developed to prevent infection caused by contact.

For example, Japanese Patent Laying-Open No. 58-7260 discloses a lancet injector in which a spring is disposed between an opposite end of a lancet holder on which a lancet is mounted and an end of a housing, and a control member is moved to a lock retracting position. In this state, the control member is pushed out from the lock-in position and the needle tip of the lancet is punctured into the skin while the spring is compressed and the lancet is housed in the housing. After use, the used lancet is discarded and used in place of a new lancet.
Japanese Patent Application Laid-Open No. 3-30757 discloses that a lancet is accommodated in a base.
A tip cap that can be attached to and detached from the base unit, and a base unit that has a hammer member that engages with the lancet to punch out the lancet and contains a spring for driving out the hammer member into the lancet. Lancet syringe, first of all,
After the base unit has been fitted, pressing the button of the base unit applies a biasing force to the spring, and the hammer member strikes the blade of the lancet from the tip cap and pierces the skin of the human body. After the lancet puncture, the spring returns to its original state and the lancet is housed in the tip cap. After that, the tip cap and the base unit are removed, and the base is removed.
A lancet syringe has been introduced that is configured to re-use the head unit but discard the tip cap.

[0004]

[Problems to be solved by the invention]
The lancet syringe disclosed in Japanese Patent No. 58-7260 replaces only a used lancet, and the lancet syringe disclosed in Japanese Patent Application Laid-Open No. 3-30757 discloses that a tip cap containing a used lancet is discarded. The base unit that houses the button, spring and hammer member that activates the puncture is to be reused, and the lancet syringe focuses solely on the disposal of the used lancet, and the entire lancet syringe is completely disposable. Not something. Therefore, if bodily fluids such as blood adhere to the lancet syringe device to be reused, there is a danger that the handler will be infected due to this, and the emergence of a device that completely disposes the lancet syringe is desired. Have been. Furthermore, even if the user decides to completely dispose of the lancet syringe, there is a danger that the operator may use the lancet syringe that has already been used again, so that the lancet syringe is designed not to be used again so that such a situation does not occur. There has been a demand in the industry for the emergence of such instruments. The present invention has been made in order to meet such a demand, and provides a lancet syringe designed so that a user of the lancet syringe does not have a risk of coming into contact with a body fluid such as blood and a used lancet syringe is not used again. The purpose is to do.

[0005]

That is, according to the present invention, a housing 1 having openings at both ends, a cap 2 attached to the base end side of the housing 1, and a lancet 4
And a lancet holder -3 slidable in the housing 1 extending from the opening 9 of the housing 1 to the lumen 20 of the cap 2 on the base end side, and a step 7 provided on the inner wall of the housing 1. In a lancet syringe comprising a spring 5 installed between the tip 11 of the lancet holder 3 and
The cap 2 has a ridge 6 provided on the inner wall thereof for locking a flange 10 formed at the base end of the lancet holder-3. 14 and a side end projection 13 that is engaged with an outer wall projection 21 installed on the outer wall of the housing 1. The tip of the lancet 4 is inside the housing 1, and the spring 5 is contracted by pressing the cap-shaped bub body 2. Lancet 4
Moves to the outside from the opening 8 of the housing 1 to puncture the skin of the human body.
The distance L from the ridge 6 of the cap 2 to the inner closed end 15 is the distance D from the expansion protrusion 14 installed on the outer wall of the housing 1 to the outer wall protrusion 21.
It is a lancet syringe characterized by being longer. In the lancet syringe according to the present invention, the distance D is a distance from the flange 10 at the base end of the lancet holder 3 to the expansion protrusion 14 at the base end of the housing 1 when the tip of the lancet 4 is inside the housing 1. It is a syringe. Further, in the lancet syringe according to the present invention, an outer wall projection 21 is provided on an outer wall of the housing 1, and a side end projection is provided.
13 can be locked, and the distance D
This is a lancet syringe which is the distance from the outer wall projection 21 to the outer wall projection 21.

[0006]

The tip of the housing 1 of the lancet syringe according to the present invention.
After contacting the skin 17 with the skin surface, the head 16 of the cap 2 is lightly pressed by hand to move the lancet holder 3 toward the distal end of the housing 1 to compress the spring 5. Then, the tip of the lancet 4 mounted on the lancet holder 3 protrudes outward from the inside of the housing 1 through the opening 8, and the pointed tip of the tip of the lancet 4 pierces the skin to allow blood to flow out. At the same time, the flange 10 of the lancet holder 3 is disengaged from the ridge 6 provided on the inner wall of the cap 2 by the urging force of the spring 5, and the inner wall of the cap 2 and the closed end 15 are closed.
Then, the state shifts to the lumen 20 composed of And lancet 4
Moves toward the base end and is housed in the housing 1. As a result, the used lancet is housed in the housing 1 and there is no danger of the operator touching the blood. Further, the lancet syringe after the blood has flowed out of the skin of the human body pushes the head 16 of the cap 2 again by hand and pushes the lancet 4 out of the opening 8 of the housing 1 to puncture the skin. Since the distance L from the ridge 6 to the inner closed end 15 is longer than the distance D from the expansion projection 14 installed on the outer wall of the housing 1 to the outer wall projection 21, the cap 2 is provided at the inner end of the opening. Side projection 13
Is locked to the outer wall projection 21, and the lancet holder 3 does not move toward the distal end of the housing 1, so that blood cannot flow out by puncturing the skin surface of the lancet 4. A small amount of blood flowing out of the puncture site is collected by a pipette or a capillary and used for a blood test.

[0007]

EXAMPLES Examples of the present invention will be described below with reference to examples. FIG.
FIG. 2 is an exploded perspective view of the lancet syringe of the present invention, FIG. 2 is a cross-sectional view showing a state of the lancet syringe of the present invention before puncturing the skin, and FIG. 3 is a cross-sectional view showing a state of the lancet syringe of the present invention puncturing the skin. FIG. 4 is a sectional view showing the state of the lancet syringe of the present invention after puncturing the skin, and FIG. 5 is a sectional view showing the state of another embodiment of the lancet syringe of the present invention before puncturing the skin. . In the figure, 1 is a housing,
2 is a cap, 3 is a lancet holder, 4 is a lancet, 5 is a spring, 6 is a ridge, 10 is a flange, 13 is a side end protrusion, 14 is an expansion protrusion, 20 is a lumen, and 21 is an outer wall protrusion. .

FIG. 2 is a sectional view showing the state of the lancet syringe of the present invention before puncturing the skin of a human body. The tip of the lancet 4 mounted on the lancet holder 3 by the urging force of the spring 5 is located inside the housing 1. It is stored. The housing 1 has openings 8 and 9 at both ends,
A step 7 for supporting the spring 5 is provided in the middle of the inner wall. The tip of the spring 5 remains engaged in the step 7. The lancet holder 3 can move by sliding on the inner wall of the housing 1. Lancet holder
Although the tip 11 of the spring 3 is in contact with the end of the spring 5, the spring 5 may be installed in the lancet holder 3 by engaging it if necessary. Examples of the spring 5 include a flat spring and a screw-type coil spring. A screw-type coil spring is generally used, and the lancet 4 is arranged so as to come to the center line of the spring. The lancet holder-3 has an outer diameter substantially corresponding to the inner diameter of the housing 1 up to the base end 14 of the housing 1, but the outer diameter of the lancet holder-3 outside the opening 9 of the housing 1 is equal to the inner diameter of the housing 1. It is preferable that the outer diameter is smaller than that of the opening 9 so as to substantially slide on the inner surface of the opening 9. The spring 5 of the lancet syringe before puncturing the skin is in an open state, and pushes up the tip 11 of the lancet holder-3. The inclined surface 19 of the lancet holder 3 is a boundary where the outer diameter of the lancet holder 3 becomes smaller from the inner diameter of the housing 1 to the inner diameter of the opening 9, and the expansion protrusion formed on the inner wall and the outer wall at the base end of the housing 1 by the spring 5. Locked at 14, pushing the lancet holder-3 up to that position.

The lancet 4 is a hollow needle or a striated needle with a sharp tip, is surrounded by a spring 5, and its rear end is mounted and fixed in the lancet holder-3. Lancet holder-3 having a reduced outer diameter extending outward from opening 9
Is inserted into the cap 2, and a flange 10 having an outer diameter slightly larger than the outer diameter of the lancet holder 3 is formed at the base end. The cap 2 is connected to the housing 1 by locking the lancet holder 3, the side projection 13 and the expansion projection 14 provided on the outer wall of the housing 1. The side end surface of the flange 10 is formed so as to slide on the inner wall of the cap 2, and its base end 12 is locked by a ridge 6 provided on the inner wall of the cap 2. Generally, at least two, preferably two to four projections are formed on the inner wall of the cap 2, but may be annular projections extending over the inner periphery. Further, the expansion protrusion 14 is
At least two projections provided on the outer wall and the inner wall at the base end, or annular projections extending over the outer periphery. Further, the base end of the housing 1 may be composed of several folds 18 on which the expansion protrusions 14 shown in FIG. 1 are formed. FIG. 1 is an exploded perspective view of the lancet syringe of the present invention before connecting the lancet holder-3 and the cap 2 to the housing 1. FIG. The fold 18 has at most several long cutouts having a distance D between the projections provided on the outer wall of the housing 1, and the lancet holder-3 is inserted into the housing 1 when the lancet syringe is manufactured. Acts as an indexing mechanism for insertion into

In FIG. 2, after the tip 17 of the housing 1 is brought into contact with the skin surface, the head 16 of the cap 2 is lightly pressed by hand, and the lancet syringe is moved to the lancet holder-3 of the housing 1 as shown in FIG. It moves in the direction of the tip and compresses the spring 5. The tip of the lancet 4 mounted on the lancet holder 3 protrudes outward from the inside of the housing 1 through the opening 8, and the sharp puncture at the tip of the lancet 4 punctures the skin and allows blood to flow out. At the same time, lancet holder
As shown in FIG. 4, the flange 10 of FIG. 4 is released from the engagement with the ridge 6 provided on the inner wall of the cap 2 by the biasing force of the spring 5, and is formed of the inner wall of the cap 2 and the closed end 15. Cavity
Move to 20. As a result, the lancet 4 after puncturing the skin
Also moves toward the base end and is housed in the housing 1.

FIG. 4 is a sectional view showing the state of the lancet syringe of the present invention after puncturing the skin. Cap 2 is a side wall projection
Due to 13, only the movement from the expansion protrusion 14 installed on the outer wall on the base end side of the housing 1 to the outer wall protrusion 21 is performed. And
Distance L from ridge 6 of cap 2 to internal closed end 15
Are expansion protrusions installed on an outer wall on the base end side of the housing 1.
When the head 16 of the cap 2 is pushed, the cap 2 moves only up to the outer wall projection 21 because the distance D is longer than the distance D from the outer projection 14 to the outer wall projection 21. 12 is a closed end 15 inside the cap 2
, And remains in the lumen 20. Therefore, the lancet holder 3 does not move in the distal direction in the housing 1, and the distal end of the lancet 4 does not protrude outward from the opening 8 at the distal end of the housing 1, so that the skin cannot be punctured again. The outer wall projection 21 is at least two projections or annular projections installed on the outer wall of the housing 1.

FIG. 5 is a cross-sectional view showing another embodiment of the lancet syringe according to the present invention before puncturing the skin. The outer wall projection 21 provided on the outer wall of the housing 1 in the lancet syringe of FIG. 2 has been removed. It is a lancet syringe. After the front end 17 of the housing 1 is brought into contact with the skin surface, when the head 16 of the cap 2 is lightly pressed by hand, the lancet holder 3 moves toward the front end of the housing 1 and compresses the spring 5. The tip of the lancet 4 mounted on the lancet holder 3 protrudes outward from the inside of the housing 1 through the opening 8, and the sharp puncture at the tip of the lancet 4 punctures the skin and allows blood to flow out. At the same time, the flange of the lancet holder-3
The urging force of the spring 5 releases the engagement of the projection 6 provided on the inner wall of the cap 2 with the urging force of the spring 5 and shifts to the lumen 20 formed by the inner wall of the cap 2 and the closed end 15. As a result, the distal end of the lancet 4 after puncturing the skin also moves in the proximal direction and is housed in the housing 1. The side projection 13 of the cap 2 moves from the expansion projection 14 to the distal side along the outer wall on the proximal side of the housing 1, but the flange 10 at the proximal end of the lancet holder 3 expands at the proximal end of the housing 1. It moves only until it comes into contact with the projection 14. The distance L from the ridge 6 of the cap 2 to the inner closed end 15 is longer than the distance D from the flange 10 at the base end of the lancet holder 3 to the expansion protrusion 14 at the base end of the housing 1. When the head 16 of the cap 2 is pushed, the cap 2 moves only to a position where the flange 10 abuts on the expansion protrusion 14. Therefore, the base end 12 of the lancet holder 3 is located inside the cap 2. Without being reached at the closed end 15 of the body. Therefore, the lancet holder 3 does not move in the distal direction in the housing 1, and the distal end of the lancet 4 does not protrude outward from the opening 8 at the distal end of the housing 1, so that the skin cannot be punctured again. The materials for the housing 1, the cap 2, and the lancet holder-3 include polyethylene, polypropylene, polyvinyl chloride, polyester, polyamide, polyacrylonitrile, polymethacrylate, polystyrene, polyurethane, and copolymers thereof.

[0013]

According to the lancet syringe of the present invention, the operator only needs to press the head 16 of the cap 2 with a single operation to bleed the blood by puncturing the skin of the lancet 4 into the human body and store the used lancet in the housing 1. This is a completely disposable lancet syringe that prevents blood infection of the operator and prohibits reuse of the used lancet syringe. Further, the lancet syringe of the present invention punctures the skin instantaneously with only one operation and causes blood to flow out, so that the blood volume is substantially constant and no extra blood flows out.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the lancet syringe of the present invention.

FIG. 2 is a cross-sectional view showing a state of the lancet syringe of the present invention before puncturing skin.

FIG. 3 is a cross-sectional view showing a state of the lancet syringe of the present invention while puncturing the skin.

FIG. 4 is a cross-sectional view showing a state of the lancet syringe of the present invention after puncturing the skin.

FIG. 5 is a sectional view showing a state of another embodiment of the lancet syringe of the present invention before puncturing the skin.

[Explanation of symbols]

 Reference Signs List 1 housing 2 cap 3 lancet holder 4 lancet 5 spring 6 ridge 10 flange 13 side protrusion 14 expansion protrusion 20 lumen 21 outer wall protrusion

Claims (3)

(57) [Claims] 1. A housing 1 having openings at both ends, a cap 2 mounted on a base end of the housing 1, a lancet 4 mounted on a distal end 11, and a housing 1 on the base end.
Lancet holder 3 slidable in the housing 1 extending from the opening 9 of the cap 2 to the lumen 20 of the cap 2, a step 7 provided on the inner wall of the housing 1, and the lancet holder 3
In a lancet syringe comprising a spring 5 installed between the tip 11 of the lancet and the cap 11, the cap 2 locks a flange 10 formed at the base end of the lancet holder 3 with a ridge 6 provided on its inner wall. A side end projection 13 which is engaged with the expansion projection 14 at the base end of the housing 1 is provided on the inner side end of the opening of the cap 2.
The tip of the lancet 4 is located in the housing 1, and the spring 5 is contracted by pressing the cap-shaped bub body 2, and the tip of the lancet 4 moves to the outside from the opening 8 of the housing 1 to clean the skin of the human body. While puncturing, the flange 10 of the lancet holder-3 is
And the distance L from the ridge 6 of the cap 2 to the inner closed end 15 is set such that the side projection 13 of the cap 2 is formed on the outer wall of the housing 1. A lancet syringe which is longer than a distance D that can be moved along the lancet syringe. 2. The distance D from the flange 10 at the base end of the lancet holder 3 to the expansion projection 14 at the base end of the housing 1 when the tip of the lancet 4 is inside the housing 1. Lancet syringe. 3. An outer wall projection 21 is provided on an outer wall of the housing 1 so that the outer wall projection 21 can be engaged with the side end projection 13. A distance D is a distance from the expansion projection 14 to the outer wall projection 21. The lancet syringe according to claim 1.