JPH07124256A - Injector - Google Patents

Abstract

PURPOSE:To prevent the leakage of a drug and perform an injection work very easily by preparing a medicine member filled preliminarily with a medicine and a needle member. CONSTITUTION:A medicine member 1 is provided with a cylindrical body 10 and a cylindrical guide member 20 is fixed to the open section of the body 10. Also, a piston member 30 capable of motion in watertight sealed state is laid in the guide member 20. The space of the body 10 sealed in watertight state with the piston member 30 is filled with a medicine 40. A needle member 2 has an outer cylinder 50, and a flange type finger touch section 51 radially extended is formed on the edge of the cylinder 50 at the open side thereof. Furthermore, a cylindrical slide member 60 is internally fixed to the cylinder 50, and the outer diameter of the member 60 approximately agrees to the inner diameter of the guide member 20. The slide member 60 has a needle 70 fastened in the same direction as the axial center thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe prefilled with a medicine.

[0002]

2. Description of the Related Art In recent years, so-called kit products, which are products in which a drug and a medical device are combined as one administration system, have been widely used.

Conventionally, a syringe as a kit product of this type is one in which a medicine is simply filled in an injection cylinder. However, since such a syringe is simply a syringe filled with a drug, the drug is in contact with the injection needle, and the drug may leak from the injection needle.

The applicant of the present invention has already proposed a syringe which solves the above problems, prevents the drug from coming into contact with the outside air (bacteria, etc.), prevents the drug from leaking, and allows the injection work to be performed very easily. (Japanese Patent Laid-Open No. 3-168154). This syringe includes an outer cylinder having an insertion opening formed at one end, a needle provided inside the outer cylinder and having one end protruding from an end opposite to the insertion opening, and a needle inside the outer cylinder. A stopper provided at an intermediate portion of the inner cylinder, an inner cylinder having one end opened and filled with a medicine, and a piston member watertightly provided in the opening of the inner cylinder and slidable in the inner cylinder. Then, by pushing the inner cylinder into the outer cylinder, the needle penetrates the piston member and the drug is pushed out from the needle.

[0005]

SUMMARY OF THE INVENTION The above-mentioned syringe is extremely preferable because it can easily perform the injection work, and a syringe of this kind has been widely demanded. Therefore, the present inventor has further studied and completed the present invention.

[0006]

The syringe of the present invention comprises a medicinal member filled with a medicinal product and a needle member provided with a needle for pushing the medicinal product in combination with the medicinal member. The member for use is a cylinder with one end opened and a drug filled inside, a cylindrical guide member provided at the opening of the cylinder, and a watertight slidable inside the cylinder provided inside the guide member. The needle member has a slide member slidable in the guide member, a needle whose tip projects from both ends of the slide member, and a finger pad fixed to the slide member. By pushing the member into the cylindrical body, the needle penetrates the piston member and the drug is pushed out from the needle.

The syringe of the present invention is composed of a member for medicines and a member for needles which are separated when not in use and are integrally combined during use.

The cylindrical body is filled with a medicine, and its closed end is preferably formed so that the thumb can be easily applied when pushing the cylindrical body. In addition, since it is easy to manufacture the medicinal component, it is preferable to form it from an ampoule. That is, by opening the large diameter side of the ampoule, first providing a piston member or the like in this opening, then filling the ampoule with the drug, and then closing the small-diameter opening filled with the drug by melting, It can be manufactured more easily than the method of fixing the piston member after filling with.

The guide member is in contact with the slide member so that the cylindrical body can move in parallel and smoothly, and the contact state can take various forms. For example, there are contact between a cylindrical inner surface and a cylindrical outer surface, contact between a cylindrical inner surface and a plurality of rod-shaped members, contact between an inner surface of a polygonal cylinder and an outer surface of a polygonal cylinder, and contact between an inner surface of a star-shaped cylinder and an outer surface of a star-shaped cylinder.

The piston member is formed in such a manner that it is pressed against the cylinder to keep the inside watertight, can slide in the cylinder, and can be penetrated by the needle.

The slide member has various configurations in relation to the guide member as described above.

If the needle has an acute angle at one end so that it can be injected into a human body and the like, and the other end can penetrate through the piston member, even if the intermediate portion is made of a different material, a different shape, It may be formed with a diameter or the like.

The drug is similar to that used in conventional syringes.

[0014]

According to the present invention, the cylinder accommodates the medicine, the piston member prevents the medicine from leaking from the cylinder, and when the cylinder is pushed in, the guide member and the slide member come into contact with each other to prevent the medicine from leaking. Smoothing the movement, the piston member pushes the drug into the needle, and the pushed drug is pushed out through the needle. Further, by pushing the forefinger and the middle finger against the finger rest, the work for pushing the cylindrical body is ready.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the syringe of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a syringe according to an embodiment of the present invention in a separated state, and FIGS. 2 to 4 are sectional views of the same in a used state.

In FIG. 1, reference numeral 1 is a drug member filled with a drug, and reference numeral 2 is a needle member provided in combination with the drug member 1 to eject a drug.

The medicinal member 1 is provided with a substantially cylindrical tubular body 10 made of glass and having one end opened, and the closed end of the tubular body 10 is a thumb pad portion 11 on which a thumb is placed during injection. Has become. A cylindrical guide member 20 made of plastic is fixed to the opening of the cylindrical body 10.
Are concentrically formed in two steps, and the small diameter portion 21 is a cylindrical body.
The large diameter portion 22 is in contact with the open end surface of the tubular body 10 while being fitted into the tubular body 10. Inside the guide member 20, there is arranged a piston member 30 which is movable while the cylinder 10 is watertightly closed. The piston member 30 is formed of a flexible rubber into a cylindrical shape with one end surface bulging, and one end surface is a spherical end surface.
31 and the other end face is a flat end face 32, the flat end face 32 contacts the small diameter portion 21 of the guide member 20, and the spherical end face 31 has a curvature similar to that of the thumb rest portion 11 of the tubular body 10. . Further, a plurality of grooves 33 are formed in the circumferential surface of the piston member 30 in the circumferential direction, and a hole 34 having a U-shaped cross section is formed in the center of the spherical end surface 31. The medicine 40 is filled in the space of the cylindrical body 10 that is watertightly closed by the piston member 30.

The needle member 2 is provided with a cylindrical outer cylinder 50 which is made of plastic and has one end opened. The inner diameter of the outer cylinder 50 is substantially the same as the outer diameter of the cylindrical body 10, and the end surface on the opening side is the same. Has a flange-shaped finger contact portion 51 extending in the radial direction, and a protruding needle fixing portion 53 is integrally formed at the center of the outer surface of the closing portion 52 at the closing side end.

A cylindrical slide member 60 made of plastic and having one end opened is fixed inside the outer cylinder 50. The slide member 60 has an outer diameter of the guide member 20.
Is substantially the same as the inner diameter of, and the closed end is a pressing portion 61 for pressing the piston member 30 formed flat, the length of the pressing portion 61 and the open end of the outer cylinder 50. The thickness is substantially the same as the thickness of the piston member 30 and the thumb rest 11.

A needle 70 is fixed to the slide member 60 in the same direction as the axis of the slide member 60. The needle 70 has a drug-side end portion 71 protruding from the pressing portion 61 and a human body-side end portion 72. Is protruding from the closed portion 52 of the outer cylinder 50, the drug-side end portion 71 has a length slightly shorter than the length of the hole 34 of the piston 30, and the human-body-side end portion 72 has an appropriate length for injection. ing.

To use the syringe as described above, first, as shown in FIG. 2, the guide member 20 is inserted into the outer cylinder 50 and the slide member 60 is inserted into the guide member 20. Then, the drug-side end portion 71 of the needle 70 penetrates the piston member 30, and its tip is positioned in the hole 34, so that the drug 40 can be sucked. Then, when the thumb 10 is put on the thumb rest 11 and the forefinger and the middle finger are put on the finger rest 51 and the cylinder 10 is pushed in, the piston member 30 is pressed against the slide member 60 as shown in FIG. 40 is pushed into the drug side end 71 and pushed out from the article side end 72. At this time, the piston member 30 smoothly slides on the inner surface of the cylindrical body 10 while maintaining the watertightness by the groove 33. Then, as shown in FIG. 4, the cylinder 10 is pushed all the way to complete the injection.

In order to manufacture the pharmaceutical member 1 as described above, first, as shown in FIG. 5, a container 80, an piston member 30 and a guide member 20 using an ampoule for forming the cylinder 10 are prepared. To do. The container 80 is formed in the same manner as a container used for manufacturing a conventional ampoule except that the bottom is not formed, and is composed of a medicine filling section 81 and a narrow neck section 82. Then, as shown in FIG. 6, the medicine filling section
Press the piston member 30 into the bottom of 81 and
To fix. Then, after the medicine 40 is filled from the narrow neck portion 82 with a filling device (not shown), the narrow neck portion 82 is removed and the space portion is melt-sealed to complete the pharmaceutical member 1 as shown in FIG.

FIG. 7 is a side view of another embodiment of the needle member, and FIG. 8 is a perspective view of another embodiment of the needle member.

7 and 8, the slide member 90
Is composed of a pressing portion 91 and two rod members 92, and instead of the cylindrical surface, the two rod members 92 come into contact with the guide member 20 to push in the tubular body 10. Further, instead of the outer cylinder, a bottom plate 100, a guide rod 101 fixed to the bottom plate 100, and a finger pad 102 formed by bending the guide rod 101 are formed. With such a configuration, the manufacturing cost can be reduced.

[0025]

According to the present invention, by preparing a drug member and a needle member prefilled with a drug, the drug can be prevented from leaking and the injection work can be extremely simplified.

[Brief description of drawings]

FIG. 1 is a front view of a detachment of a syringe according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a usage state of an embodiment of the syringe of the present invention.

FIG. 3 is a sectional view showing a usage state of an embodiment of the syringe of the present invention.

FIG. 4 is a cross-sectional view showing a usage state of an embodiment of the syringe of the present invention.

FIG. 5 is a diagram showing a process of manufacturing a medicinal member for a syringe of the present invention.

FIG. 6 is a diagram showing a process for producing a medicinal member for a syringe of the present invention.

FIG. 7 is a front view showing another embodiment of the needle member of the syringe of the present invention.

FIG. 8 is a perspective view showing another embodiment of the needle member of the syringe of the present invention.

[Explanation of symbols]

 1 ... Medicine member 2 ... Needle member 10 ... Cylinder 20 ... Guide member 30 ... Piston member 40 ... Medication 51 ... Finger rest 60 ... Slide member 70 ... Needle 90 ... Slide member 102 ... Finger rest

Claims (2)

[Claims] 1. A drug product member filled with a drug product,
Composed of a member for needles provided with a needle for pushing out a drug in combination with this member for drugs, the member for drugs is
A tubular body having one end opened and a drug filled therein, a tubular guide member provided at the opening of the tubular body, and a piston member provided inside the guide member and watertightly slidable in the tubular body. The needle member has a slide member that is slidable in the guide member, a needle whose tip projects from both ends of the slide member, and a finger pad fixed to the slide member. A syringe characterized in that by pushing the needle through the piston member by pushing it into the needle, the drug is pushed out from the needle. 2. The syringe according to claim 1, wherein the tubular body is formed by using an ampoule.