JPH09131336A - Vacuum blood sampling tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent danger of attachment of blood remaining on the surface of a recessed part in a plug body to hands or fingers or a sampling person in removing a blood sampling needle from the plug body after completion of blood sampling. SOLUTION: A vacuum blood sampling tube 1 comprises a blood sampling tube main body 2 which is opened at one end and close at the other end, and a plug body 3 fitted in the aperture part, the inside of the blood sampling tube main body 2 is kept in a reduced pressure, and a blood sampling needle is pierced to the plug body 3. In the plug body 3, a recessed part 4 is formed from an upper surface inward in such a way that width of a vertical cross sectional surface through a center of the recessed part 4 is not uniform, where a narrower width part 41 of the recessed part 4 is less than 10mm deep and less than 10mm wide, or that width of the vertical cross sectional surface through the center of the recessed part 4 is constant, where it is less than 10mm deep and less than 10mm wide.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vacuum blood collection tube.

[0002]

2. Description of the Related Art Conventionally, when collecting blood for a blood test, a vacuum blood collection tube in which a plug is fitted in an opening in an airtight state has been used. The conventional vacuum blood collection tube 11 will be described with reference to FIG. The vacuum blood collection tube 11 has a tubular blood collection tube main body 12 having one end open and the other end closed, and an elastic plug body 13 such as a rubber plug is fitted into the opening of the blood collection tube main body 12, The inside of the blood vessel body 12 is kept in a reduced pressure state. The plug 13 has a generally hemispherical recess 14 formed from the upper surface toward the inside (for example,
FIG. 2 of Japanese Patent Publication No. 2-56095, JP-A-58-5
(Fig. 1 and Fig. 4 of Japanese Patent Publication No. 8057), the recess 14 has a substantially semicircular vertical cross section passing through the center of the recess 14, and generally, the width of the upper end is 10 mm or more and the depth thereof is 5 mm or less. Has been done.

A method of using the vacuum blood collection tube 11 will be described below. When collecting blood, first, a multiple injection needle is attached to the blood collection tube holder 15 as the blood collection needle 16, and the blood collection needle 16
After piercing the tip portion 161 of the blood vessel into the blood vessel (not shown), the vacuum blood collection tube 11 is inserted into the blood collection tube holder 15, and the rear end portion 162 of the blood collection needle 16 is fitted into the blood collection tube body 12 of the vacuum blood collection tube 11. The inside of the blood vessel and the inside of the blood collection tube main body 12 are directly connected by piercing the combined plug body 13. The blood collection tube body 1
Since the inside of 2 is kept in a depressurized state, blood is automatically sucked into the blood collection tube main body 12 to collect blood. Next, after collecting a predetermined amount of blood, the vacuum blood collection tube 11 is retracted from the blood collection tube holder 15, and the rear end portion 162 of the blood collection needle 16 is pulled out from the plug body 13 to complete the blood collection.

At the time of collecting blood, when the tip portion 161 of the blood collecting needle 16 is inserted into the blood vessel, or when the vacuum blood collecting tube 11 is replaced during blood collection to collect blood in a plurality of vacuum blood collecting tubes 11, or When blood collection is completed, when the rear end 162 of the blood collection needle 16 is pulled out from the stopper 13, the blood collection needle 1 is arranged so that blood does not blow out from the rear end 162 of the blood collection needle 16.
A rubber sheath 17 is attached to the side of the blood collection tube holder 15 of 6. The sheath 17 is provided at the rear end 1 of the blood collection needle 16.
62 is pierced by the rear end portion 162 immediately before it is pierced by the stopper body 13, and when the rear end portion 162 of the blood sampling needle 16 pierces the stopper body 13 during blood collection, it is pushed by the stopper body 13. It is contracted as seen in FIG. Then, the sheath 17 restores the original shape when the rear end portion 162 of the blood collection needle 16 is pulled out from the stopper 13, thereby preventing the blood from blowing out.

When collecting the blood, the rear end portion 16 of the blood collecting needle 16
When 2 is removed from the stopper 13, blood in the blood collecting needle 16 or blood attached to the inner and outer surfaces of the rear end 162 remains on the surface of the recess 14 of the stopper 13, and this blood is collected by the blood collector. There is a problem that it may adhere to fingers and cause blood infection.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a concave surface of a stopper body when a blood collecting needle is removed from the stopper body after blood collection is completed. It is to provide a vacuum blood collection tube in which there is no risk of residual blood sticking to the finger of the blood collector.

[0007]

As shown in FIG. 1, a vacuum blood collection tube 1 of the present invention has an elastic plug 3 at an opening of a tubular blood collection tube main body 2 having one end open and the other end closed. Are fitted together, and the inside of the blood collection tube main body 2 is kept in a reduced pressure state.

The plug 3 is, as shown in detail in FIG.
The recess 4 is formed from the upper surface toward the inside, and the recess 4
The width of the vertical cross section passing through the center of the recess is not constant in the depth direction, and the depth of the narrow portion 41 of the recess is 10 mm.
Is less than 10 mm and the width is less than 10 mm, or as shown in detail in FIG. 3, the vertical cross-sectional shape passing through the center of the recess 4 has a constant width in the depth direction, and the depth is less than 10 mm and the width is less than 10 mm. It is less than 10 mm.

In the plug body 3, when the vertical cross-sectional shape passing through the center of the recess 4 has a constant width in the depth direction, the narrow portion 41 of the recess 4 becomes deeper at the lower portion of the portion 41. Since the thickness of the plug is thin and it is difficult to maintain the vacuum degree of the vacuum blood collection tube 1, it is less than 10 mm, and when it is shallow, the blood remaining in the portion 41 at the end of blood collection may overflow from the portion 41. Preferably, the width of the portion 41 is 2 to 4 mm, and when the width of the portion 41 becomes wider, the finger of the blood sampler can make the portion 41 wider.
The width of the blood collection needle is less than 10 mm, and it becomes difficult for the blood collection needle to enter the central portion of the portion 41 when the blood collection is narrowed. The blood remaining in the portion 41 is
Since there is a risk of overflowing from within 1, it is preferably 3-5 m
m. The shape of the portion 41 may be various shapes such as a cylindrical shape, a rectangular tube shape and the like, but a cylindrical shape is preferable from the viewpoint of moldability, and in this case, the width of the portion 41 is equal to the diameter of the cylinder.

When the vertical cross-section of the plug 3 passing through the center of the recess 4 has a constant width in the depth direction, the depth of the recess 4 becomes deeper and the thickness of the plug below the recess 4 increases. 10m because it becomes thin and it becomes difficult to maintain the vacuum degree of the vacuum blood collection tube 1.
When the depth is less than m, the blood remaining in the concave portion 4 at the end of blood collection may overflow from the concave portion 4 when the blood sampling is finished. Therefore, the width is preferably set to 4 to 6 mm. 4 easily enters the recess 4 at the end of blood collection.
Since it is more likely that the hand of the blood collector touches the remaining blood, the width will be less than 10 mm, and if the width becomes narrower, the blood collecting needle will be recessed.
It is difficult to enter the central part of the blood vessel, and blood remaining in the concave portion 4 may overflow from the concave portion 4.
5 mm. The shape of the recess 4 may be a cylindrical shape, a rectangular tube shape, or other various shapes, but a cylindrical shape is preferable from the viewpoint of moldability, and in this case, the width of the recess 4 is equal to the diameter of the cylinder.

Examples of the material of the plug body 3 include rubber such as natural rubber, butyl rubber, chlorinated butyl rubber and brominated butyl rubber, and thermoplastic elastomer.

Examples of the material of the blood collection tube main body 2 include glass and plastic, and as the plastic, polyethylene terephthalate, nylon, polypropylene, polyethylene and the like are preferably used.

As an example of the method for manufacturing the vacuum blood collection tube 1 of the present invention, the blood collection tube main body 2 is manufactured by injection molding and the stopper 3 is manufactured by casting or injection molding, and the blood collection tube main body 2 is placed under reduced pressure. In this state, the stopper 3 is fitted to the blood collection tube main body.

The method of using the vacuum blood collection tube of the present invention is the same as the method described in the section of the prior art.

[0015]

Next, embodiments of the present invention will be described. (Embodiment 1) In the plug body used in this embodiment, as shown in FIG. 2, the concave portion 4 of the plug body 3 is composed of a wide portion 42 of the concave portion and a narrow portion 41 of the concave portion. The wide portion 42 of the recess has a substantially hemispherical shape, and the narrow portion 41 of the recess is formed in a cylindrical shape from the bottom of the wide portion 42 toward the inside. The wide portion 42 of the recess has a diameter (a in the figure) of 10 mm at the upper end and a depth (b in the figure) of 4
mm, the diameter (c in the figure) of the narrow portion 41 of the recess is 5 m
m, the depth (d in the figure) is 4 mm, and the diameter of the fitting portion (e in the figure) is 10 mm. The stopper 3 made of chlorinated butyl rubber having such a shape was used as a sample for a blood collection tube body made of polyethylene terephthalate (length 75 mm, outer diameter of opening 12.6 mm,
The vacuum blood collection tube 1 having the shape shown in FIG. 1 was produced by fitting the inner diameter of the opening (10.0 mm) 2 under reduced pressure.

Using this vacuum blood collection tube 1, blood was collected according to a usual method, and after removing the vacuum blood collection tube from the blood collection tube holder, the upper part of the stopper was pressed with a finger to observe the presence or absence of blood adhesion. The same test was performed on three vacuum blood collection tubes,
No blood adhered to the fingers in either case.

(Embodiment 2) Instead of the plug body 3 of Embodiment 1, the recess 4 shown in FIG. 3 has a diameter (f in the figure) of 3 mm,
The procedure was performed in the same manner as in Example 1 except that a plug 3 made of chlorinated butyl rubber having a depth (g in the figure) of 6 mm and a fitting portion (h in the figure) of 10 mm in diameter was used. However, blood did not adhere to the fingers in either case.

(Comparative Example 1) Instead of the plug 3 of Example 1, the recess 4 shown in FIG. 4 has a substantially hemispherical shape, and the upper end has a diameter of 10 mm, a depth of 4 mm, and a fitting portion diameter. 10 mm
Other than using the chlorinated butyl rubber stopper 3 of
When the same procedure as in Example 1 was performed, blood adhered to the finger in each case.

[0019]

The structure of the vacuum blood collection tube of the present invention is as described above. When the vacuum blood collection tube of the present invention is used, when the blood collecting needle is withdrawn from the stopper after the blood collection is completed, the concave portion of the stopper is removed. There is no risk of blood remaining on the surface sticking to the finger of the blood sampler.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a vacuum blood collection tube of the present invention.

FIG. 2 is a vertical cross-sectional view passing through the center of the recess of the stopper of the vacuum blood collection tube according to the embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view through the center of the recess of the stopper of another embodiment of the vacuum blood collection tube of the present invention.

FIG. 4 is a vertical cross-sectional view that passes through the center of the recess of the stopper of the vacuum blood collection tube of the comparative example.

FIG. 5 is a vertical cross-sectional view showing a state where blood is collected using a vacuum blood collection tube.

[Explanation of symbols]

 1, 11 Vacuum blood collection tube 2, 12 Blood collection tube body 3, 13 Plug body 4, 14 Recessed portion 15 Blood collection tube holder 16 Blood collection needle 41 Narrow width portion of recessed portion 42 Widened portion of recessed portion 161 Tip portion 162 Rear end portion 17 sheath

Claims (1)

[Claims] 1. A plug body is fitted into an opening of a tubular blood collection tube body having one end opened and the other end closed to keep a depressurized state inside the blood collection tube body, and a blood collection needle is attached to the plug body during use. A vacuum blood collection tube to be pierced, wherein the plug has a recess formed from the upper surface toward the inside, and the recess has a vertical cross-sectional shape passing through the center of the recess with a constant width in the depth direction. The depth of the narrow portion of the recess is less than 10 mm and less than 10 mm, or the vertical cross-sectional shape passing through the center of the recess has a constant width in the depth direction, and the depth is less than 10 mm and A vacuum blood collection tube having a width of less than 10 mm.