JPH1119186A - Plastic-made two-hole-type two-headed needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy all of a liquid flowing property, an operability at the time of piercing a needle and the stability of coring by permitting a needle tip part to be a nearly conical shape, permitting the horizontal cross section shape of a needle body and two holes to be almost an oblong shape with a prescribed value of a ratio of a long diameter to a short diameter and permitting the total cross section opening area occupation rate of the two holes to be more than prescribed % of the horizontal cross section. SOLUTION: This two-hole-type two-headed needle is formed so as to be an oblong shape being near to a complete circle in the horizontal cross section shape of the needle body 1 and the tario of the long diameter D1 with the short one D2 is set to be within the range of <=1.5. Moreover, a conical shape with small needle piercing resistance is adopted as the tip parts of the upper and lower parts of the needle body 1. Then, the two holes 2 and 3 for a ventilation and liquid passage are provided with the same horizontal cross section opening area and its shape is made close to the complete circle with the ratio of the long diameter d1 to the short one d2 being <=1.7. The holes 2 and 3 are arranged so as to permit the long diameter d1 to be in parallel with the short diameter D2 of the needle mainbody 1 at the both sides with a vertical surface containing the short diameter D2 of the needle mainbody 1 as reference and the total horizontal cross section opening area occupying rate of the two holes 2 and 3 is made to be more than 45% in the horizontal cross section area of the needle mainbody 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic material used for dissolving a drug by introducing a dissolving solution from a dissolving solution-containing container into a drug-containing container, and dissolving the dissolving solution back into the dissolving solution-containing container after dissolution. It relates to a two-hole double-ended needle.

[0002]

2. Description of the Related Art Various types of plastic double-hole double-ended needles have already been proposed, and usually have a needle body having a ventilation hole and a liquid hole arranged in parallel. Is divided into upper and lower parts based on the holder.

In a two-hole double-ended needle, if the cross-sectional opening area of the hole is small, it becomes difficult for the liquid to flow. Therefore, as shown in Japanese Patent Application Laid-Open No. 54-113991, one of the two holes is enlarged. The other is made smaller, the former is a liquid flow path, the latter is an air flow path, or the cross section of the hole is made semi-circular or oblong as shown in JP-A-53-140890. Various measures have been taken to maximize the occupancy rate of the cross-sectional area.

[0004]

However, in the former method, the liquid is erroneously introduced into the air flow passage having a small hole diameter during the operation of moving the solution between containers, and as a result, the liquid is difficult to flow. This may cause a situation, and the liquid circulation is not very good. Further, in order to ensure the flowability of the liquid, a troublesome auxiliary operation such as pressing the container to promote the flow of the liquid may be required, and there is a problem in the operability.

In the latter type, as shown in FIG. 4, the needle tip is obliquely cut, so that the needle piercing resistance is greater than that of a conical needle tip, making it difficult to pierce the rubber stopper. There is a problem. In this case, if the needle tip is made conical, as shown in FIG. 5, the conical shape of the needle tip collapses due to the cross-sectional shape of the hole (see FIG. 6), and a deeply concave portion a is generated. However, this portion a is not preferable because it becomes a cause of coring in addition to resistance during needle sticking.

An object of the present invention is to provide a two-hole double-ended needle which satisfies all of the liquid flowability, operability at the time of needle sticking, and safety against coring.

[0007]

According to the present invention, there is provided a needle body having a substantially elliptical cross-sectional shape and a ratio of a major axis to a minor axis of ≤1.5, and upper and lower needle tips of the needle body. Is substantially conical, and two holes having substantially the same transverse opening area for liquid passage and ventilation are arranged in parallel on both sides of a vertical plane including the minor axis of the needle body in the needle body. The two-hole entrances are respectively opened at the upper and lower conical needle tips of the needle main body and are located on both sides of the vertical plane. Further, the cross-sectional shape of the two holes is substantially elliptical and the ratio of the major axis to the minor axis Is ≦ 1.7 and the major axis is parallel to the minor axis of the needle body,
A plastic material having a total transverse opening area occupancy of at least 45% of the transverse area of the needle body;
It relates to a hole type double-ended needle.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the double-ended needle of the present invention includes a needle body 1 having two holes 2 and 3 for ventilation and liquid passage arranged in parallel. Reference numeral 1 denotes an upper portion 1A and a lower portion 1B which are formed integrally with the center of the needle holder 4 in a penetrating state at a substantially middle portion in the axial direction.
And divided into

A cylindrical portion 5 is integrally formed on the outer peripheral portion of the needle holder 4 at an intermediate portion of a vertical height. On the upper surface side of the holder 4, a holding tube 6 of a container mouth portion is provided concentrically and inside the cylindrical portion 5. Are integrally formed.

The double-ended needle of the present invention is manufactured by using a plastic such as polyethylene, polypropylene or polycarbonate used for medical instruments and applying an appropriate molding means such as an injection molding method.

One feature of the present invention is that, in the double-ended needle having the above-described structure, as shown in FIG. 2, the cross-sectional shape of the needle main body 1 is formed into a substantially elliptical shape relatively close to a perfect circle. At the point,
The ratio of the major axis D1 to the minor axis D2 is ≦ 1.5, preferably 1.
It is set in the range of 1 to 1.3.

The needle puncture resistance is the smallest in a perfect circle. In the present invention, in order to suppress an increase in needle stick resistance due to the oval shape as much as possible, the oval shape is limited to a shape relatively close to a perfect circle.

Further, the upper and lower needle tips 1a, 1
b adopts a conical shape with a small needle puncture resistance, and from this side also reduces the needle puncture resistance.

Another feature of the present invention is that the two holes 2 and 3 for ventilation and liquid passage have the same cross-sectional opening area, and the cross-sectional shape is relatively close to a perfect circle, for example, a long diameter d1 and a short diameter. The ratio of d2 is ≤1.7, and preferably ≤1.6, which is a substantially elliptical shape.

The holes 2 and 3 are provided in the needle body 1 with respect to the needle body 1.
With reference to the vertical plane including the minor axis D2 (see FIG. 2), the major axis d1 is disposed on both sides thereof so as to be parallel to the minor axis D2 of the needle main body 1. The conical needle tips 1a and 1b are opened on both sides with respect to the vertical plane. Still another feature of the present invention is that the total occupation ratio of the cross-sectional opening area of the two holes 2 and 3 is not less than 45% of the cross-sectional area of the needle body 1 and the opening area of the holes 2 and 3 is relatively large. ing.

According to the present invention, as shown in FIG. 2, a needle body 1 having a substantially elliptical cross section is provided with two holes 2 and 3 having a substantially elliptical cross section, and D2 and the major axis d
1 are formed so as to be parallel to each other, the portions 1a and 1b of the needles 1a and 1b hardly have a deeply hollowed portion a (see FIG. 5), and the conical shapes of the needles 1a and 1b are held substantially as they are. it can.

Therefore, the needle piercing resistance can be suppressed low and the occurrence of coring can be prevented by the cross-sectional shape of the needle main body 1 which is close to a perfect circle and the conical shape of the needle tip.

Further, since the two holes 2 and 3 have the same transverse opening area and the total transverse opening area occupies 45% or more, preferably 45 to 70%, of the transverse area of the needle main body. The opening area of the holes 2 and 3 is increased, and the flowability of the liquid is improved. If the total occupation ratio of the transverse opening area of the holes exceeds 70%, molding becomes difficult, and the strength of the needle body 1 decreases, which is not preferable.

The results of comparing the present invention with Comparative Examples 1 to 3 are shown below.

[0021]

According to the present invention, a double-ended needle of the present invention having the following dimensions was obtained by injection molding of polypropylene. In addition, about 10 mm of the needle tip was formed in a conical shape.

Holes 2, 3: major axis 3.12 mm, minor axis 2.1 mm
(Major axis / minor axis = 1.49) Needle body 1: major axis 5.4mm, minor axis 4.6mm (major axis / minor axis =
1.17) Occupancy rate of transverse opening area of holes 2 and 3: 50.1%

[0023]

[Comparative Example 1] Figs.
A double-ended needle having the following dimensions shown in Table 1 was obtained. In addition, about 10 mm of the needle tip was formed in a conical shape.

Holes 2 ', 3': major axis 3.7 mm, minor axis 1.7 m
m (major axis / minor axis = 2.18) Needle body 1 ': 5mmφ (true circle) Transverse opening area occupancy of holes 2', 3 ': 50.3%

[0025]

Comparative Example 2 A double-ended needle having the following dimensions shown in FIG. 4 was obtained by injection molding of polypropylene. The needle tip was cut obliquely over about 10 mm to obtain a needle tip (see the figure).

Holes 2 ", 3": major axis 3.7mm, minor axis 1.7mm (major axis / minor axis = 2.18) Needle body 1 ": 5mmφ (true circle) Total opening area of 2 holes Occupancy: 50.3%

[0027]

[Comparative Example 3] Injection molding of polypropylene
A double-ended needle described in FIGS. 2 to 4 of 4-113991 was obtained. The length of the needle tip is about 10 mm.

Large hole: 4.2 mm in diameter, Small hole: 1.0 mm in diameter Needle body: 5.4 mmφ (true circle) Total occupancy of the transverse opening area of the large and small holes: 50.3%

[0029]

[Comparative test] The following tests were performed on the double-ended needles of the present invention and Comparative Examples 1 to 3.

(I) Sensory Test Regarding Needle Pricking Resistance Each of the above-mentioned double-ended needles was pierced into a rubber stopper made of isoprene rubber with a polyethylene thin film, and the resistance felt by the hand when the needle was punctured was compared. The following results were obtained.

* The one that felt the highest needle puncture resistance-The present invention ... 0 people-Comparative Example 1 ... 13 people-Comparative Example 2 ... 7 people-Comparative Example 3 ... 10 people * Most needle puncture resistance・ The present invention ... 19 ・ Comparative Example 1 ・ ・ ・ 0 ・ Comparative Example 2 ・ ・ ・ 11 ・ Comparative Example 3 ・ ・ ・ 0 (ii) Coring test In the same manner as above, a rubber stopper was pierced, and the number of cores out of 500 was examined. The results are as follows.

The present invention: 0 pieces Comparative Example 1: 13 pieces
Comparative Example 2 ... 15 pieces Comparative Example 3 ... 7 pieces (iii) Liquid flow test The double-ended needle of the present invention and Comparative Example 3 was pierced into a rubber stopper of a 100 ml saline container, and the other needle was a vial of an antibiotic. The mouth of the bottle was stabbed and turned upside down. After the solution was filled in the antibiotic vial bottle, when the solution was turned upside down, the solution of the present invention dropped down only by shaking lightly,
In the case of Comparative Example 3, about 80% of the liquid did not fall down unless strongly hit or violently shaken the table.

[0033]

According to the present invention, it is possible to provide a plastic double-hole double-ended needle which satisfies all of the flowability of liquid, the operability at the time of needle sticking, and the safety against coring.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged plan view of the needle body of the double-ended needle of the present invention.

FIG. 3 is a perspective view of a needle tip of FIG. 2;

FIG. 4 is a perspective view of Comparative Example 2.

FIG. 5 is a diagram corresponding to FIG. 2 of Comparative Example 1.

FIG. 6 is a diagram corresponding to FIG. 3;

[Description of Signs] 1 Needle body 1a Needle tip 1b Needle tip 2 hole 3 hole 4 Needle holder 5 Cylindrical part 6 Holding cylinder

Claims (2)

[Claims] 1. A needle body having a cross section of a substantially elliptical shape and a ratio of a major axis to a minor axis of ≦ 1.5, and upper and lower needle tips of the needle body are substantially conical, In the needle body, two holes having substantially the same transverse opening area for liquid passage and ventilation are arranged in parallel on both sides of a vertical plane including the minor axis of the needle body. The upper and lower conical needle tips respectively open and are located on both sides of the vertical plane, and the two holes have a substantially oval cross-sectional shape with a ratio of major axis to minor axis of ≦ 1.7 and A two-hole double-ended needle made of plastic, characterized in that the major axis is parallel to the minor axis of the needle main body, and the total occupancy of the transverse opening area of the two holes is 45% or more of the cross-sectional area of the needle main body. 2. The ratio of the major axis to the minor axis of the two holes is ≦ 1.6, and the ratio of the major axis to the minor axis of the needle body is 1.1 to 1.3. 2. The two-hole double-ended needle according to 1.