JP2008167844A - Injection syringe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection syringe for quickly injecting a medicament used by dissolving in a liquid such as a medicinal solution immediately before the injection. <P>SOLUTION: The medicinal solution W in an outer cylinder 3 is introduced into a medicament compartment 45 through holes 14, 19, 33 by pulling a plunger 39. As a result, the medicament P is dissolved in the medicinal solution W. Next, the plunger 39 is pushed to return the medicinal solution W in which the medicament P is dissolved into the outer cylinder 3. The holes 14, 19 are closed with a closing part 31, and the hole 33 is closed with a closing part 15 by rotating at least either an inner cylinder 11 or a cylindrical body 27 about the axis center so that the inside of the outer cylinder 3 is completely separated from the medicament compartment 45. Then, the inner cylinder 11 is pressed down to administer the medicinal solution W in which the medicament P is dissolved to a patient through a needle 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a syringe, and more particularly to a syringe in which a liquid is prefilled in an outer cylinder.

  Many drugs need to be dissolved in a liquid such as a drug solution just before administration. This is because the medicinal effect decreases when the drug is dissolved in the liquid and time elapses. When administering this kind of medicine by injection, the liquid is sucked up by injection and weighed, put into a container to dissolve the medicine, and then sucked up again with a syringe and injected into the patient.

However, especially in the field of emergency medicine, there are often no delays of several minutes for dissolving the drug in the liquid in the container.
The present invention has been made paying attention to the above-mentioned conventional problems, and its object is to provide a syringe capable of quickly injecting a drug to be used by dissolving it in a liquid such as a drug solution immediately before administration. To do.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 includes an outer cylinder in which a needle is attached to a distal end portion, and an inner cylinder that is attached and inserted in the outer cylinder. In a syringe having an inner cylinder that pushes liquid from a needle, and the outer cylinder is prefilled with liquid, a medicine container that contains a drug, and a state that isolates the drug container from the inner cylinder The communication switching means for switching to the communication state and the state in which the medicine container and the inside of the outer cylinder communicate with each other by the communication switching means, the liquid in the outer cylinder is once introduced into the container and introduced into the container A syringe including liquid introduction means for returning the liquid together with the medicine into the outer cylinder.

  A second aspect of the present invention is the syringe according to the first aspect, wherein the medicine accommodating portion is provided inside a cylindrical body accommodated in the inner cylinder.

  According to a third aspect of the present invention, in the syringe according to the first or second aspect, the communication switching means is configured such that the inner cylinder side closing part provided at the tip of the inner cylinder and a part of the inner cylinder side closing part are missing. An inner cylinder side switching member having an inner cylinder side hole portion, an accommodating portion side closing portion covering the distal end opening of the medicine accommodating portion, and a portion of the accommodating portion side closing portion being omitted. And at least one of the inner tube side switching member and the housing portion side switching member is rotatable about an axis, and the inner tube side hole and the housing portion side closing portion are provided. A state in which the container portion side hole and the inner cylinder side closing portion overlap to overlap the medicine container portion and the outer cylinder, and the inner tube side hole portion and the container portion side hole portion overlap to overlap the medicine. It is a syringe characterized by being able to switch to the state where a storage part and the inside of an outer cylinder communicate.

  According to a fourth aspect of the present invention, in the syringe according to the third aspect, the inner cylinder side switching member is constituted by a cap that is mounted so as to cover the distal end side of the inner cylinder.

  A fifth aspect of the present invention is the syringe according to the third or fourth aspect, wherein the accommodating portion side switching member is constituted by a cap that is mounted so as to cover the distal end portion side of the medicine accommodating portion.

  A sixth aspect of the present invention is the syringe according to any one of the second to fifth aspects, wherein the cylindrical body is rotatably inserted into the inner cylinder.

  A seventh aspect of the present invention is the syringe according to any one of the second to fifth aspects, wherein the cylindrical body is fixed to the inner cylinder.

  According to an eighth aspect of the present invention, in the syringe according to any one of the second to seventh aspects, the liquid introducing means is constituted by a plunger that is inserted into the cylindrical body so as to be movable in the axial direction. It is a syringe.

  According to a ninth aspect of the invention, in the syringe according to the seventh aspect, the inner cylinder side closing portion operates together with the inner cylinder when the inner cylinder moves in the axial direction, and does not rotate even if the inner cylinder rotates. A syringe that is provided so as to be in a state, and that operates to move together with the inner cylinder when the inner cylinder moves in the axial direction, and to rotate with the inner cylinder when the inner cylinder rotates.

The invention according to claim 10 is the syringe according to any one of claims 2 to 9, wherein the inner cylinder side closing portion is formed integrally with a packing between the inner cylinder and the outer cylinder. It is.
It is.

  According to the syringe of the present invention, it is possible to quickly inject a medicine to be used after being dissolved in a liquid such as a medicine just before administration.

A syringe 1 according to Embodiment 1 of the present invention will be described with reference to FIGS.
A needle 5 is attached to the distal end of the outer cylinder 3 (see FIG. 2A), and an opening 6 is provided at the rear end. Further, a finger flange 7 is provided on the outer periphery of the rear end portion of the outer cylinder 3. Further, as shown in FIG. 1, a scale 9 is provided on the outer peripheral surface of the outer cylinder 3.

  The inner cylinder 11 is formed in a cylindrical shape having a conical portion 12 at the tip, and a pair of holes 14 are formed in the conical portion 12 of the inner cylinder 11. A cap 13 made of synthetic rubber as an inner cylinder side switching member is attached to the distal end side of the inner cylinder 11. The inner surface of the cap 13 is formed in a conical shape that fits snugly with the conical portion 12, and the front portion of the cap 13 constitutes a closing portion 15 as an inner cylinder side closing portion, and a part of the closing portion 15 is missing. A pair of holes 19 are formed. The pair of holes 19 and the pair of holes 14 of the conical portion 12 correspond to and communicate with each other, and the conical portion 12 is covered with a closing portion 15.

The pair of holes 14 and the pair of holes 19 constitute an inner cylinder side hole.
Further, a packing 21 constituted by two ridges is provided on the outer peripheral surface of the cap 13. An opening 23 is provided at the rear end of the inner cylinder 11. Further, a flange 25 is provided on the outer periphery of the rear end portion of the inner cylinder 11.

The cylindrical body 27 is formed in a substantially cylindrical shape and has an outer diameter that is slightly smaller than the inner diameter of the inner cylinder 11. A synthetic rubber cap 29 as an inner cylinder side switching member is attached to the distal end side of the cylindrical body 27. The front surface of the cap 29 constitutes a closing portion 31 as a cylindrical body side closing portion, and a part of the closing portion 31 is missing to form a pair of holes 33 as cylindrical body hole portions. The distal end opening 35 of the cylindrical body 27 is covered with a closing part 31 of the cap 29. Further, a packing 37 constituted by two ridges is provided on the outer peripheral surface of the cap 29.
An opening 28 is provided at the rear end of the cylindrical body 27. Further, a flange 30 is provided on the outer periphery of the rear end portion of the cylindrical body 27.
The caps 13 and 29, the inner cylinder 11 and the cylindrical body 27 constitute communication switching means.

  The plunger 39 as the liquid introducing means is formed in a substantially cylindrical shape, and has an outer diameter that is slightly smaller than the inner diameter of the cylindrical body 27. A packing 41 is attached to the tip of the plunger 39, and a flange 43 is provided on the outer periphery of the rear end of the plunger 39.

  As shown in FIG. 2A, the inner cylinder 11 is inserted from the opening 6 of the outer cylinder 3, and the cylindrical body 27 is inserted from the opening 23 of the inner cylinder 11 so as to be movable in the axial direction. A plunger 39 is inserted through the opening 28 of the 27 so as to be movable in the axial direction. The packing 21 of the cap 13 is in close contact with the inner peripheral surface of the outer cylinder 3, the packing 37 of the cap 29 is in close contact with the inner peripheral surface of the inner cylinder 11, and the packing 41 of the plunger 39 is the inner periphery of the cylindrical body 27. It is in close contact with the surface.

The outer cylinder 3 is filled with a liquid medicine W as a liquid, and a powdery medicine P is contained in a medicine container 45 constituted by the inside of the cylindrical body 27.
The cap 29 is fitted in the cap 13, and the hole 19 of the cap 13 and the hole 33 of the cap 29 are in a position rotated 90 degrees relative to each other as shown in FIG. Therefore, the holes 14 and 19 are closed by the closing part 31, and the hole 33 is closed by the closing part 15, so that the inside of the outer cylinder 3 and the medicine container 45 are isolated from each other. Furthermore, the distal end side of the needle 5 is closed by a cap (not shown) attached to the outer cylinder 3, so that the chemical solution W in the outer cylinder 3 is sealed.
Further, the drug P in the drug container 45 is also sealed because the hole 19 is closed by the closing part 31 and the packing 41 of the plunger 39 is in close contact with the inner peripheral surface of the cylindrical body 27 as described above. .

Next, the usage method of this syringe 1 is demonstrated.
First, a cap (not shown) that closes the distal end side of the needle 5 is removed, and at least one of the inner cylinder 11 and the cylindrical body 27 is rotated around its axis, 14 and the hole 19 of the cap 13 and the hole 33 of the cap 29 overlap each other so that the medicine container 45 and the inside of the outer cylinder 3 communicate with each other (see FIG. 3B).

  And the plunger 39 is pulled and the chemical | medical solution W in the outer cylinder 3 is once introduce | transduced into the chemical | medical agent accommodating part 45 through the holes 14, 19, and 33 as shown to Fig.3 (a). As a result, the drug P is dissolved in the drug solution W. Next, as shown in FIG. 4A, the plunger 39 is pushed in, and the drug solution W in which the drug P is dissolved is returned into the outer cylinder 3. In this state, the hole 14, the hole 19, and the hole 33 are overlapped with each other so that the medicine container 45 and the inside of the outer cylinder 3 communicate with each other (see FIG. 4B).

Next, at least one of the inner cylinder 11 and the cylindrical body 27 is rotated about its axis, and the holes 14 and 19 are closed by the closing portion 31 as shown in FIG. Is closed by the closing portion 15 so that the inside of the outer cylinder 3 and the medicine container 45 are isolated. Then, as shown in FIG. 5A, the inner cylinder 11 is pushed down, and the drug solution W in which the drug P is dissolved is administered to the patient via the needle 5.
Thus, according to the syringe 1, the drug P can be dissolved in the drug solution W immediately before administration and can be quickly injected.

Next, a method for filling the syringe 1 with the drug P and the drug solution W will be described.
As shown in FIG. 6, the plunger 39 is inserted partway through the opening 28 at the rear end of the cylindrical body 27. Then, the medicine P is put into the medicine container 45 through the tip opening 35 and the cap 29 is attached.
Next, as shown in FIG. 7, the cylindrical body 27 fitted with the plunger 39 as described above is inserted into the inner cylinder 11 from the opening 23. Further, the inner cylinder 11 is inserted into the outer cylinder 3, and as shown in FIG. 8B, the holes 14 and 19 are closed by the closing part 31, and the hole 33 is closed by the closing part 15. Then, the inner tube 11 is pulled up and the drug solution W is sucked into the outer tube 3 from the tip. Then, the needle 5 is attached to the outer cylinder 3, and a cap (not shown) is attached to close the distal end side of the needle 5.
As described above, the syringe 1 is filled with the drug P and the drug solution W and sealed.

A syringe 51 according to Embodiment 2 of the present invention will be described with reference to FIGS.
Since the syringe 51 has the same members as those of the syringe 1 according to the first embodiment, the same members are denoted by the reference numerals used in the first embodiment, and description thereof is omitted.
Reference numeral 53 denotes an inner cylinder. The inner cylinder 53 is substantially cylindrical, and a disc 55 is formed in the rear end opening 54. A cylindrical body 57 is provided through the disk 55 so as to penetrate therethrough. A rear end portion of the cylindrical body 57 protrudes toward the back side of the disk 55, and a flange 59 is provided at the protruding portion. The distal end of the cylindrical body 57 slightly protrudes from the distal end opening 64 of the inner cylinder 53.

  A cap 70 as an inner cylinder side switching member is fitted on the distal end side of the inner cylinder 53, and the distal end opening 64 of the inner cylinder 53 is covered with a closing portion 75 of the cap 70. The cap 70 has a main body 72 and a cylindrical fitted portion 73 formed at the center inside the main body. The fitted portion 73 is provided integrally with the closing portion 75, and communicates with a pair of holes 77 as inner cylinder side holes formed by omitting a part of the closing portion 75.

A cap 67 made of synthetic rubber as a cylindrical body side switching member is attached to the distal end side of the cylindrical body 57. A front end opening 63 is formed by the front surface of the cap 67, and a part of the closing portion 71 is missing to form a pair of holes 68 as cylindrical body side holes. The distal end opening 63 of the cylindrical body 57 is covered with a closing portion 71 of a cap 67 as a housing portion side switching member. The cap 67 is rotatably fitted to the fitted portion 73 of the cap 70.
The caps 67 and 70, the inner cylinder 53 and the cylindrical body 57 constitute communication switching means.

Next, the usage method of this syringe 51 is demonstrated.
First, the cap that closes the distal end side of the needle 5 is removed, and the cylindrical body 57 is rotated together with the inner cylinder 53 about its axis, and the cap 67 attached to the cylindrical body 57 is rotated. Move. Then, the hole 77 of the cap 70 and the hole 68 of the cap 67 overlap each other so that the medicine container 45 and the inside of the outer cylinder 3 communicate with each other.

In the above operation, the cap 70 has the packing 21 in intimate contact with the inner peripheral surface of the outer cylinder 3 and does not move in the rotating direction and is in a fixed state. And the hole 68 can overlap each other. Both the cap 70 and the cap 67 can operate in the axial direction.
The other usage method of the syringe 51 and the filling method of the drug solution W and the drug P are the same as those of the syringe 1 of the first embodiment.
Thus, in the syringe 51, the inner cylinder 53 and the cylindrical body 57 can be formed as an integral member, and the number of parts can be reduced as compared with the syringe 1.

The embodiment of the present invention has been described in detail above. However, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change without departing from the gist of the present invention. included.
For example, in the above embodiment, the drug P is in powder form, but the present invention is not limited to this, and the drug P can be liquid.
Further, the syringes 1 and 51 are of the type in which the needle 5 is directly attached to the outer cylinder 3, but it is also possible to apply to a syringe of the type in which the needle 5 is attached through a tube.

  The syringe of the present invention can be widely used in various medical fields.

It is an exploded perspective view of the syringe concerning Embodiment 1 of the present invention. (A) is a longitudinal sectional view before use of the syringe of FIG. 1, (b) is a hole of the cap attached to the inner cylinder and the hole of the cap attached to the cylindrical body before use of the syringe of FIG. It is a figure which shows a positional relationship. (A) is a longitudinal sectional view for explaining how to use the syringe of FIG. 1, and (b) is a hole and a cylindrical body of a cap attached to an inner cylinder for explaining how to use the syringe of FIG. It is a figure which shows the positional relationship with the hole of the mounted | wearing cap. (A) is a longitudinal sectional view for explaining how to use the syringe of FIG. 1, and (b) is a hole and a cylindrical body of a cap attached to an inner cylinder for explaining how to use the syringe of FIG. It is a figure which shows the positional relationship with the hole of the mounted | wearing cap. (A) is a longitudinal sectional view for explaining how to use the syringe of FIG. 1, and (b) is a hole and a cylindrical body of a cap attached to an inner cylinder for explaining how to use the syringe of FIG. It is a figure which shows the positional relationship with the hole of the mounted | wearing cap. It is a figure for demonstrating the method to fill the injection device of FIG. It is a longitudinal cross-sectional view for demonstrating the method to fill the injection device of FIG. (A) is a longitudinal cross-sectional view for explaining a method of filling the syringe of FIG. 1 with a medicine, (b) is a cap attached to an inner cylinder for explaining a method of filling the syringe of FIG. It is a figure which shows the positional relationship of a hole and the hole of the cap with which the cylindrical body was mounted | worn. It is a disassembled perspective view of the syringe which concerns on Embodiment 2 of this invention. (A) is a top view of the outer cylinder of the syringe of FIG. 9, (b) is a longitudinal cross-sectional view of the outer cylinder of the syringe of FIG. It is a longitudinal cross-sectional view of the inner cylinder of the syringe of FIG. It is a longitudinal cross-sectional view of the cap with which the cylindrical body of the syringe of FIG. 9 is mounted | worn. It is a longitudinal cross-sectional view of the cap with which the outer cylinder of the syringe of FIG. 9 is mounted | worn. FIG. 10 is a front view of the plunger of the syringe of FIG. 9. (A) is a longitudinal sectional view for explaining how to use the syringe shown in FIG. 9, and (b) shows a cap hole and a cylindrical body mounted on the inner cylinder for explaining how to use the syringe shown in FIG. It is a figure which shows the positional relationship with the hole of the mounted | wearing cap. (A) is a longitudinal sectional view for explaining how to use the syringe shown in FIG. 9, and (b) shows a cap hole and a cylindrical body mounted on the inner cylinder for explaining how to use the syringe shown in FIG. It is a figure which shows the positional relationship with the hole of the mounted | wearing cap. (A) is a longitudinal sectional view for explaining how to use the syringe shown in FIG. 9, and (b) shows a cap hole and a cylindrical body mounted on the inner cylinder for explaining how to use the syringe shown in FIG. It is a figure which shows the positional relationship with the hole of the mounted | wearing cap. (A) is a longitudinal sectional view for explaining how to use the syringe shown in FIG. 9, and (b) shows a cap hole and a cylindrical body mounted on the inner cylinder for explaining how to use the syringe shown in FIG. It is a figure which shows the positional relationship with the hole of the mounted | wearing cap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Syringe 5 Outer cylinder 7 Needle 7 Finger flange 9 Scale 11 Inner cylinder 13 Cap 15 Closure part 19 Hole 21 Packing 23 Opening 25 Flange 27 Cylindrical body 28 Opening 29 Cap 30 Flange 31 Closing part 33 Hole 35 Tip part opening 37 Packing 39 Plunger 41 Packing 43 Flange 45 Drug container 51 Syringe 53 Inner cylinder 54 Rear end opening 55 Disc 57 Cylindrical body 59 Flange 63 Front end opening 65 Front end opening 67 Cap 69 Front end opening 71 Closure 70 Cap 72 Main body 73 Mated part 77 Hole W Chemical solution P Drug

Claims (10)

  An outer cylinder in which a needle is attached to the tip, and an inner cylinder that is inserted in the outer cylinder and pushes the liquid in the outer cylinder from the needle, and the outer cylinder is prefilled with the liquid A syringe containing a medicine, communication switching means for switching between a state of isolating the medicine container from the outer cylinder, and a state of communicating with the medicine container, and the medicine container and the outer cylinder by the communication switching means And a liquid introducing means for once introducing the liquid in the outer cylinder into the housing portion and returning the liquid introduced into the housing portion together with the medicine into the outer cylinder.   The syringe according to claim 1, wherein the medicine container is provided inside a cylindrical body that is housed in the inner cylinder.   The syringe according to claim 1 or 2, wherein the communication switching means includes an inner cylinder side closing portion provided at a distal end portion of the inner cylinder, and an inner cylinder side hole portion formed by missing a part of the inner cylinder side closing portion. An inner cylinder side switching member, an accommodating portion side closing portion that covers the distal end opening of the medicine accommodating portion, and an accommodating portion side switching portion that is formed by missing a portion of the accommodating portion side closing portion. And at least one of the inner cylinder side switching member and the accommodating part side switching member is rotatable about the axis, the inner cylinder side hole and the accommodating part side closing part overlap, and the accommodating part side hole And the inner cylinder side closing part overlap each other and the medicine container and the outer cylinder are separated from each other, and the inner cylinder side hole and the container part side hole overlap and the drug container and the outer cylinder. A syringe that can be switched to a state in which the communication is established.   4. The syringe according to claim 3, wherein the inner cylinder side switching member is constituted by a cap that is mounted so as to cover a tip end side of the inner cylinder.   5. The syringe according to claim 3 or 4, wherein the storage portion side switching member is constituted by a cap that is mounted so as to cover a distal end portion side of the medicine storage portion.   The syringe according to any one of claims 2 to 5, wherein the cylindrical body is rotatably inserted into the inner cylinder.   The syringe according to any one of claims 2 to 5, wherein the cylindrical body is fixed to the inner cylinder. The syringe according to any one of claims 2 to 7, wherein the liquid introducing means is constituted by a plunger that is movably inserted into the cylindrical body in the axial direction.   The syringe according to claim 7, wherein the inner cylinder side closing portion is provided so as to operate together with the inner cylinder when the inner cylinder moves in the axial direction, and does not rotate even if the inner cylinder rotates. The injector is characterized in that the container side closing portion operates with the inner cylinder when the inner cylinder moves in the axial direction, and rotates with the inner cylinder when the inner cylinder rotates.   The syringe according to any one of claims 2 to 9, wherein the inner cylinder side closing portion is formed integrally with a packing between the inner cylinder and the outer cylinder.