JP2001058007A - Syringe filled with medicine and piston - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily complete a syringe filled with medicine and to prevent liquid leakage or the like by providing a piston with an air discharge hole to be tightly sealed after inserting the piston into a cylinder and tightly sealing the air discharge hole after inserting the piston. SOLUTION: On the tip of the outer peripheral wall 6 of this piston 1, a sliding peak part 7 positioned at the outer periphery of a top plate part 5 is provided so as to be elastically deformed through a recessed groove. On the top plate part 5, a pipe part 11 provided with the air discharge hole 9 on the center is provided projectingly to the inner part of a hollow part 18. The ejection part 13 of the filled medicine is provided projectingly to a tip part on the cylinder 2 and is tightly sealed with a cap 14. When filling liquid is filled inside the cylinder 2 to a distance D and the piston 1 is inserted from a opening part 17, air inside the cylinder 2 is discharged from the air discharge hole 9 through the hollow part 18 to the outdoor air and the piston 1 is smoothly inserted to a prescribed position inside the cylinder 2. When the air discharge hole 9 is tightly sealed by thermal melt-sticking or the like, this syringe filled with the medicine is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medicine-filled syringe for medical use, an anesthesia gun, animal treatment and the like.

[0002]

2. Description of the Related Art A demand for a syringe filled with a medicine is increasing more and more in order to prevent a medical accident and to improve work efficiency. However, when a syringe is filled with a medicine and then a piston is inserted. Conventionally, since the piston is pushed back by the compressed air and cannot be inserted, an uneven portion also serving as an air vent is provided in the cylinder, and the compressed air when the piston is inserted is extracted by the uneven portion, and the piston is inserted at the insertion position. A syringe filled with a drug was constituted by having a role of a stopper for fixing the syringe to the cylinder.

[0003]

However, when the air mixed in the medicine or the air remaining in the syringe expands due to a change in the outside air temperature, the viscosity, surface tension,
Depending on the affinity, when the piston is fixed, there is a problem that the internal pressure of the expansion cannot be completely absorbed, the sealing cannot be completed, and liquid leakage occurs. As a remedy, a syringe having a strong structure in which the sealing property is not impaired even when air is expanded, or a vacuum filling method in which air is not put into the cylinder can be considered.
However, in the case of a strong container, if it is made of plastic or the like, there is a problem in terms of strength and physical properties, the cost is difficult, and the vacuum filling has a problem that requires a large amount of equipment.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention relates to a syringe filled with a medicine in which a piston is inserted into a cylinder after the medicine is filled, and an air vent hole to be sealed after the piston is inserted into the cylinder. It is intended to provide a medicine-filled syringe which is provided and hermetically closed the air vent hole after insertion of the piston. According to the present invention, even if the piston is inserted into the cylinder after filling the medicine, the air in the cylinder escapes from the air vent hole, the piston is smoothly inserted, the air vent hole is sealed after the insertion, and the syringe filled with the medicine is filled. The piston can easily be completed, and even if the internal air pressure in the cylinder fluctuates due to external temperature fluctuations during storage after completion, the piston follows the volume change and maintains the sealing performance in the cylinder. , The liquid leakage or the like does not occur.

Further, the present invention provides a syringe filled with a medicine according to the first aspect of the present invention, wherein a piston is inserted while leaving air in a cylinder after the medicine is filled. Things. According to the present invention, even if the piston is inserted while leaving air or gas in the cylinder after the medicine is filled, even if the external temperature fluctuates during storage or the like and the volume in the cylinder fluctuates, the piston changes in volume. Slidably in the cylinder while maintaining the sealing performance, so that liquid leakage or the like does not occur.

[0006] The present invention also provides a drug-filled syringe according to claim 1 or 2, wherein an air vent hole is provided in the top plate of the piston to communicate with the outside air. Things. According to the present invention,
By providing air vent holes communicating with the outside air in the top plate of the piston that does not contact the cylinder inner peripheral wall and the piston outer peripheral wall, smooth sliding contact between the cylinder inner peripheral wall and the piston outer peripheral wall before and after the air vent hole is sealed Can be maintained.

According to a third aspect of the present invention, there is provided a syringe filled with a medicine according to the third aspect, wherein an air vent hole is provided in a top plate of a cylindrical piston whose handle side is open to the outside air. Is provided. According to the present invention, since the air vent hole is provided in the top plate of the cylindrical piston whose handle side is open to the outside air, the air vent and the closing of the air vent hole can be provided without adding another special structure and means to the syringe. The work can be performed via a cylindrical piston whose handle is open to the outside air.

The present invention also provides a piston for a drug-filled syringe having an air vent to be sealed after insertion into a cylinder. ADVANTAGE OF THE INVENTION According to the piston which concerns on this invention, a syringe filled with a medicine can be easily obtained using the cylinder same as a conventional one.

[0009] The present invention also provides a piston for a drug-filled syringe, wherein the piston according to claim 5 is provided with an air vent hole communicating with the outside air in the top plate. According to the present invention, an air vent hole to be sealed after filling the piston can be provided without making any structural changes to the inner peripheral wall of the cylinder and the outer peripheral wall of the piston that should slide in a sealed state.

According to the present invention, there is provided a piston for a drug-filled syringe according to claim 5, wherein an air vent hole is provided in a top plate portion of the cylindrical piston whose handle portion is open to the outside air. Is provided. According to the present invention, the air vent and the closing operation of the air vent hole can be performed via the cylindrical piston whose handle side is open to the outside air without making any structural changes to the inner peripheral wall of the cylinder and the outer peripheral wall of the piston. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings. Reference numeral 10 denotes a plastic syringe, which comprises a piston 1 and a cylinder 2.
The piston 1 is hollow, and the handle 3 is open to the outside. The hollow inner peripheral wall 4 is configured such that the inner diameter gradually increases from the innermost top plate portion 5 side to the handle portion 3 side, and a handle portion is provided due to a means for sealing an air vent hole 9 on the top plate portion 5 described later. The larger the inner diameter of the side 3 is, the better. In addition,
The inclination of the inner diameter of the hollow inner wall 4 is necessary also in relation to the draft of the core during molding. The piston 1 of the syringe 10
And, or the cylinder 2 is not limited to being made of plastic,
It may be made of glass or metal.

The outer diameter of the outer peripheral wall 6 of the piston 1 is gradually increased from the top plate 5 side to the handle part 3 side, similar to the inner peripheral wall 4. It is preferable that the top plate 5 has a larger outer diameter than the handle 3. At the tip of the outer peripheral wall 6 of the piston 1, a sliding ring portion 7 is located on the outer periphery of the top plate portion 5 and is elastically deformable through a concave groove 8.
Is provided.

The top plate 5 is provided with a pipe portion 11 having an air vent hole 9 in the center so as to protrude largely into the hollow portion 18. Usually, one air vent hole 9 may be provided in the center of the top plate portion 5 in the form of a pipe. However, due to the sealing means and the like, the air vent hole 9 is provided at a position deviated from the center, a plurality of air vent holes, or a porous material. It is also possible to configure. In the case of a pipe shape, the length can be extended in the direction of the handle portion 3 to facilitate sealing. 12 is an air vent hole 9
Are projections into the cylinder 2. Air vent hole 9
As the sealing means, various means such as heat welding, sealing with an adhesive, fixing of a seal member and a cap member, etc. can be adopted.

Next, the cylinder 2 is provided with a discharge section 13 for the filled medicine projecting from the distal end thereof, and is sealed by a cap 14. The inner peripheral wall portion 15 of the cylinder 2 preferably has a larger outer diameter on the handle portion 16 side than on the discharge portion 13 side when the piston 1 is inserted. Handle part 1 from the part 13 side
It is preferable that the outer diameter on the 6 side is large.

In the above configuration, as shown in FIG. 1, when the filling liquid is filled into the cylinder 2 to a distance D and the piston 1 is inserted through the opening 17 of the cylinder 2, the air in the cylinder 2 The air is released from the air vent hole 9 provided in the top plate part 5 to the outside air through the hollow part 18, and the piston 1 is smoothly inserted into a predetermined position in the cylinder 2. Here, when the air vent hole 9 is sealed by heat welding or other appropriate means, a syringe filled with the medicine is completed. In the medicine filling portion in the syringe 10, the gas portion B is changed with respect to the liquid portion A by the change of the outside air temperature.
When the volume changes due to expansion or contraction of the piston,
Slides in response to the fluctuation of the internal pressure in the cylinder 2,
The sealing property is maintained, and there is no possibility that the drug leaks out.

[0016]

As described above, according to the syringe filled with a medicine according to the present invention, in a syringe filled with a medicine in which a piston is inserted into a cylinder after the medicine is filled, the syringe is sealed after inserting the piston into the cylinder. By providing the air vent hole to be provided in the piston and closing the air vent hole after inserting the piston, even if the piston is inserted into the cylinder after filling the medicine, the air in the cylinder escapes from the air vent hole and the piston is inserted. Is carried out smoothly, the air vent hole is sealed after insertion, and the medicine-filled syringe is easily completed.At the time of storage after completion, the external temperature fluctuates and the internal pressure in the cylinder fluctuates. Also, since the piston slides in the cylinder while maintaining the sealing performance following the volume change, there is an effect that liquid leakage does not occur.

The present invention also provides a syringe filled with a medicament according to the first aspect, wherein a piston is inserted while leaving air in the cylinder filled with the medicament. Even if the piston is inserted with air or gas remaining in the cylinder, even if the outside air temperature fluctuates during storage and the volume of air or gas in the cylinder fluctuates, the piston follows the volume change and maintains the sealing performance In such a state, the liquid slides inside the cylinder, so that there is an effect that liquid leakage or the like does not occur.

Further, according to the present invention, there is provided a syringe filled with a medicine according to claim 1 or 2, wherein the top plate of the piston is provided with an air vent hole communicating with the outside air, so that the inner peripheral wall of the cylinder and the outer periphery of the piston are provided. An air vent hole that communicates with the outside air is provided on the top plate of the piston that does not come into contact with the wall, so that before and after the air vent hole is sealed, smooth sliding contact between the cylinder inner peripheral wall and piston outer peripheral wall is maintained with the sealing performance maintained. There is an effect that the property can be obtained.

The present invention also provides a syringe filled with a medicament according to the third aspect of the present invention, which has a configuration in which an air vent hole is provided in a top plate of a cylindrical piston whose handle side is open to the outside air. The air vent and the closing operation of the air vent hole can be performed through a cylindrical piston whose handle portion side is open to the outside air without adding the special structure and means described above.

Further, according to the piston for a drug-filled syringe according to the present invention, since the piston is provided with an air vent hole to be sealed after being inserted into the cylinder,
There is an effect that a syringe filled with a medicine can be easily obtained using a conventional cylinder.

According to the present invention, there is provided a piston according to claim 5, wherein the top plate portion is provided with an air vent hole communicating with the outside air, so that the inner peripheral wall of the cylinder and the piston which are slid in a sealed state with each other. There is an effect that the air vent hole to be sealed after filling the piston can be provided and the sealing operation can be easily performed without making any structural change to the outer peripheral wall.

According to the present invention, there is provided the piston according to the sixth aspect, wherein an air vent hole is provided in a top plate portion of the cylindrical piston whose handle side is open to the outside air, so that the inner peripheral wall of the cylinder and the outer periphery of the piston are provided. There is an effect that the air vent and the closing operation of the air vent hole can be performed through the inside of the cylindrical piston whose handle side is open to the outside air without making any structural change to the wall.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a main part of an embodiment of a syringe filled with a medicine according to the present invention, which is longitudinally shown.

FIG. 2 is a sectional view of a piston according to the embodiment.

FIG. 3 is a plan view of the piston of the embodiment.

FIG. 4 is a bottom view of the piston of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piston 2 Cylinder 3 Handle part 4 Hollow inner wall 5 Top plate part 6 Outer peripheral wall 7 Sliding ring part 8 Concave groove 9 Air vent hole 10 Syringe 11 Pipe part 12 Opening projection part 13 Discharge part 14 Cap 15 Inner peripheral wall part 16 Handle part 17 Opening 18 Hollow part A Liquid part B Gas part

Claims (7)

[Claims] In a syringe filled with a medicine, in which a piston is inserted into a cylinder after filling with a medicine, an air vent hole to be sealed is provided in the piston after inserting the piston into the cylinder, and the air vent hole is sealed after inserting the piston. Pre-filled syringe. 2. A syringe filled with a medicine according to claim 1, wherein a piston is inserted while leaving air inside the cylinder after the medicine is filled. 3. The syringe filled with medicine according to claim 1, wherein an air vent hole communicating with outside air is provided in a top plate of the piston. 4. The syringe filled with a drug according to claim 3, wherein an air vent hole is provided in a top plate portion of the cylindrical piston whose handle portion side is open to the outside air. 5. A piston for a drug-filled syringe having an air vent to be sealed after insertion into a cylinder. 6. The piston for a drug-filled syringe according to claim 5, wherein an air vent hole communicating with the outside air is provided in the top plate portion. 7. The piston for a drug-filled syringe according to claim 6, wherein an air vent hole is provided in a top plate portion of the cylindrical piston whose handle portion side is open to the outside air.