JPH09253203A - Liquid medicine injector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability during the housing of liquid medicine packs by pressing a press plate with a liquid medicine pack housing case kept open to engage and lock the press plate as pressed with the movement of a slide member. SOLUTION: A blade of a press lid is positioned between protrusions 37 of a body case 32 of a liquid medicine pack housing case 31. The press lid is opened and a press plate 53 is pushed down to backwardly slide a tapered part 76 of a slide member 73 of a press plate locking mechanism 72 with a protruding part 71 thereof against an energized force of a compression coil spring 74. With the further downward pushing of the press plate 53, the protruding part 71 runs over the tapered part 76. As a result, the slide member 73 returns by the force of the compression coil spring 74 so that the protruding part 71 of the press plate 53 engages a pawl 77 of the slide member 73 to be locked as pressed downward, a condition under which a liquid medicine pack 12 is housed. Then, with the closing action of a lid body and the press plate, a protruding piece 85 of a connecting part 75 of the press plate locking mechanism 72 slides to unlock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drug solution injector in which a drug solution bag is housed in a case and a drug solution is dispensed by pressing the drug solution bag by pressing means arranged in the case.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 14, a liquid medicine administration tube connected to a connecting needle 14 is prepared by suspending a liquid medicine bag 12 on a stand 11 and piercing a connecting needle 14 into a liquid medicine inlet 13 as shown in FIG. It was usually administered through an injection needle 18 to a patient's vein or the like via a flow control valve 16, an air filter 17, etc.

However, in the above administration method, when the patient goes to the toilet or the like, the stand 11 has to be dragged and moved, which is inconvenient for the patient to move freely.

Therefore, in recent years, a drug solution injector has been proposed in which the drug solution bag is placed in a drug solution bag housing case without being hung on a stand, and the drug solution is extruded and administered by a pressing means provided in the case. ing. As the pressing means, for example, one using gas pressure of a small cylinder (see Japanese Utility Model Laid-Open No. 6-46739), one including a pressure plate and a spring, and the like are known.

[0005]

However, in the case of using gas pressure such as a small cylinder as the pressing means, since the chemical bag containing case is required to be airtight, the case tends to be strong and heavy, and the manufacturing cost is low. There was a problem that it would be too high.

On the other hand, in the case where the pressing means is composed of the pressure plate and the spring, the chemical liquid bag housing case is not required to be airtight, so that the case can be made to have a simple structure and be relatively lightweight. However, when accommodating the liquid medicine bag, it is necessary to work while pushing down the pressure plate, so a strong force is required and workability is poor.

Accordingly, an object of the present invention is to provide a chemical liquid injector for injecting a chemical liquid by pressing a pressure plate against the chemical liquid bag by an elastic means, which has improved workability in accommodating the chemical liquid bag. is there.

[0008]

In order to achieve the above object, a chemical liquid injector of the present invention comprises a chemical liquid bag storage case,
In a liquid medicine injector provided with a pressing means for pressing the liquid medicine bag stored in the liquid medicine bag containing case to let the liquid medicine flow out, the pressing means is directly or indirectly via a buffer material to the liquid medicine bag. The pressure plate is in contact with the pressure plate, and the first elastic means for pressing the pressure plate in the direction of the liquid bag is provided. Inside the liquid bag storage case,
A slide having a taper portion that abuts a predetermined portion of the pressure plate when the pressure plate is pushed against the first elastic means, and a claw portion that is formed at the end of the taper portion and that engages with the pressure plate. The member is biased by the second elastic means in the direction of the claw portion and is provided slidably, and the portion connected to the slide member is formed in the liquid medicine bag storage case. It is characterized in that the portion connected to the slide member can be moved from the outside while being taken out to the outside through the elongated hole that allows the slide, and the chemical liquid bag storage case being closed.

[0009] In a preferred aspect of the present invention, the chemical liquid bag storage case includes a main body case for storing the chemical liquid bag, a lid body which is openably and closably attached to the main body case, and a presser foot which is placed outside the lid body. The pressing plate is bent so that both side portions thereof cover both side surfaces of the lid body from the outside, and is bent inward at a predetermined interval on the lower side of the bent side portions. A plurality of projections are formed at upper edges of both side walls of the main body case at intervals so that the projections can be inserted. By sliding the pressing plate in the state of being closed by the pressing plate, the claw is detachably engaged with the lower surface of the protrusion, and the part connected to the slide member is pressed by the claw. Has been done.

According to the present invention, when the pressure plate is pushed against the first elastic means in the state in which the liquid bag containing case is opened, a predetermined portion of the pressure plate comes into contact with the taper portion of the slide member, and the slide member is moved. Since the claw portion of the slide member engages with the pressure plate by the urging force of the second elastic means at the terminal end of the taper portion of the slide member, the pressure plate is locked in a pushed-in state. You can

Since the chemical liquid bag can be accommodated in the chemical liquid bag accommodating case while the pressure plate is pushed in and locked at that position as described above, the operation can be performed easily and surely.

Further, after the chemical liquid bag is accommodated in the chemical liquid bag storage case, the portion connected to the slide member is moved from the outside of the chemical liquid bag to release the engagement between the claw portion of the slide member and the pressure plate. Is released from the claw portion by the urging force of the first elastic means and presses the liquid medicine bag, so that administration of the liquid medicine can be started.

In a preferred embodiment of the present invention, a liquid medicine bag containing case includes a main body case containing the liquid medicine bag,
It consists of a lid that can be opened and closed on this body case, and a holding plate that is placed on the outside of this lid. Both sides of the holding plate are bent and claws are formed on the bottom side, and it corresponds to this claw Then, a protrusion is formed on the upper edge portion of the main body case, and the pressing plate is slid so that the claw engages with the protrusion of the main body case and the portion connected to the slide member is pressed. In such a case, since the slide member can be moved by using the holding plate for locking the lid body to the main body case, workability at the time of starting administration of the liquid medicine is improved.

[0014]

1 to 13 show one embodiment of the chemical liquid injector of the present invention. 1 is an exploded perspective view showing a pressure plate locking mechanism of a chemical liquid injector, FIG. 2 is a perspective view seen from the inside of the pressure plate locking mechanism, FIG. 3 is a perspective view seen from the outside of the pressure plate locking device, and FIG. 4 is a chemical liquid. FIG. 5 is a plan view of the chemical liquid bag storage case, FIG. 6 is a side view of the chemical liquid bag storage case, FIG. 7 is a rear view of the holding plate of the chemical liquid bag storage case, and FIG. 8 is A in FIG. 9 is a cross-sectional view taken along the line AA, FIG. 9 is a plan view showing the internal structure of the chemical liquid injector, FIG. 10 is a front cross-sectional view showing the engagement structure of the lid body and the holding plate of the chemical liquid bag storage case, and FIG. 12 is a side sectional view showing the internal structure of the chemical liquid injector, FIG. 12 is an exploded perspective view showing the holding structure of the connecting needle, and FIG. 13 is a partial sectional view showing the slide click mechanism between the holding plate 35 and the lid 34. .

As shown in FIGS. 4 to 6, the liquid medicine bag accommodating case 31 used in the liquid medicine injector has a main body case 32 having an open upper surface and a rear end of the main body case 32.
A lid 34 attached so as to be openable and closable via a pivot 33
And a pressing plate 35 slidably assembled to the outside of the lid 34.

As shown in FIGS. 7 and 8, the holding plate 35 is bent in a U-shaped cross section so that both side portions 35a and 35b cover the both side surfaces of the lid 34 from the outside. A plurality of claws 36 bent inward at predetermined intervals are provided on the lower sides of the side portions 35a and 35b. And the holding plate 35
Is attached to the outside of the lid body 34, and is assembled to the lid body 34 by engaging the claws 36 with the lower sides of both sides of the lid body 34.

On the other hand, referring also to FIGS. 9 and 10, a plurality of protrusions 37 are formed at predetermined intervals on the upper edges of both side walls of the main body case 32. A wall 38 having an inverted L-shaped cross section and having a predetermined gap between the both side walls is integrally formed below the middle of the both side walls of the main body case 32. A guide groove 39 is formed between the above and the lower surface of the protrusion 37.

As shown in FIG. 10, when closing the lid 34, the body case 32 is covered with the lid 34 to which the pressing plate 35 is attached. At this time, the claw 36 of the pressing plate 35 is brought into contact with the upper surface of the wall 38 through the space between the protrusions 37 of the main body case 32. Then, by sliding the pressing plate 35 in a predetermined direction, the claw 36 is projected along the guide groove 39.
Underneath. As a result, the claw 36 engages with the protrusion 37, the pressing plate 35 and the main body case 32 are fitted together, and the lid 34 disposed inside the pressing plate 35 is closed with respect to the main body case 32. Retained. In addition, by sliding the holding plate 35 to disengage the claws 36 from the protrusions 37 and positioning them in the gaps between the protrusions 37, in that state, if the holding plate 35 is pulled upward together with the lid 34, the lid 34 can be opened. You can

As shown in FIG. 4, the center of the front surface of the main body case 32 and the lid body 34 bulges forward, and U-shapes are formed on the front end faces of the main body case 32 and the lid body 34 so as to be aligned with each other to form vertically elongated through holes. Shaped notches 40 and 41 are formed.

As shown in FIG. 9, the neck portion of the mouth portion 13 of the main body case 32 is inserted into the notch portion 40 of the main body case 32 when the liquid medicine bag 12 is accommodated, so that the mouth portion 13 has the largest diameter. Grooved ribs 42, 43, portions of which engage forward
44 are formed. The grooves of the grooved ribs 42, 43, 44 are wider toward the front, and the width of each groove is such that the neck of the mouth 13 can be inserted. Even if the diameter of the portion 13 changes slightly depending on the type, the mouth portion 13 is engaged with one of the ribs.

Further, the cutout portion 4 of the main body case 32.
In the inner side of 0, the ribs having a U-shape when viewed from above are arranged on both sides in a portion closer to the cutout portion 40 than a portion where the grooved ribs 42, 43, 44 are formed. A guide groove 45 is formed.

As shown in FIG. 12, a plate member 46 having a disk shape as a whole and having both side portions cut in parallel is inserted into the guide groove 45. The plate member 46 is formed with a recessed groove (a U-shaped cut groove) 47 having an open upper portion for inserting the proximal end portion 14 a of the connecting needle 14. Further, an annular groove 48 formed in an arc shape is formed around the concave groove 47. Since the plate member 46 is inserted into the guide groove 45 by abutting both sides of the plate member cut in parallel to the inner wall of the guide groove 45, the plate member 46 can move up and down along the guide groove 45, but cannot rotate. There is.

In the annular groove 48 of the plate member 46, the base end portion 51 of the tubular member 50 which is cylindrical as a whole and whose peripheral wall is partially cut off in the axial direction to form the insertion portion 49 is inserted. Thus, the tubular member 50 is rotatably attached to the plate member 46. A flange portion 52 is formed near the base end portion 51. The flange portion 52 is inserted into the guide groove 45 together with the plate member 46,
It is designed to be retained.

In FIG. 12, reference numeral 14 denotes a connecting needle for piercing the mouth 13 of the liquid medicine bag 12 to let out the liquid medicine, and a liquid medicine administration tube 15 is connected to the proximal end portion 14a thereof, and an intermediate portion. A flange portion 14b is formed on the front end portion, and a chemical liquid inlet 14c is formed on the front end portion 14d.

As shown in FIGS. 9 and 11, the main body case 32
A pressure plate 53 for pressing the drug solution bag 12 is arranged therein. A pair of parallel ribs 54 extending in the front-rear direction are formed at the center of the lower surface of the pressure plate 53, and slits 55 having a predetermined length are formed at both ends of the rib 54. A bearing 56 is installed in the center of the bottom wall of the main body case 32.

Then, the bottom wall of the main body case 32 and the pressure plate 53.
A pair of plate-shaped links 57 are arranged between and. The pair of links 57 are arranged between the pair of ribs 54 of the pressure plate 53 side by side in the front-rear direction, and are mounted on a pair of support shafts 59 provided in parallel with a bearing 56 arranged in the center of the bottom wall of the main body case 32. , Their pivoted ends are butted. Further, the pair of links 57 have their separated ends pivotally supported by a pair of support shafts 58 inserted into the slits 55 provided at both ends of the rib 54 of the pressure plate 53.

Further, gears 60, 60 meshing with each other are attached to the ends of the pair of support shafts 59. As a result, when the link 27 rotates to move the pressure plate 53 up and down, the rotation angle of each link 27 is synchronized so that the pressure plate 53 moves up and down in parallel with the bottom wall of the main body case 32. Has become.

Further, first spring members 61, 6 made of tension coil springs are provided at both ends of the support shaft 58 arranged at the front and rear.
1 is stretched. The first spring members 61, 61 pull the support shaft 58 along the slits 55 of the ribs 54, and press the pair of links 57 as shown by phantom lines in FIG.
The pressure plate 53 is biased so that the pressure plate 53 moves upward.

Further, between the pressure plate 53 and the bottom wall of the main body case 32, there are arranged second spring members 62 composed of compression coil springs arranged at a total of four positions. The second spring member 62 directly presses the pressure plate 53 and urges it to move upward.

By combining with the link 27, the output load of the first spring members 61, 61 can be set so as to increase as the pressure plate 53 moves upward. On the other hand, since the output load of the second spring member 62 is the compression coil spring, the output load decreases as the pressure plate 53 moves upward. Therefore, the total output load of the two is the pressure plate 53.
Can be set to be substantially constant regardless of the amount of movement, or can be set to increase as the pressure plate 53 rises. According to an experiment, in order to always cause the chemical solution in the chemical solution bag 12 to flow out at a constant rate, it is preferable that the total output load is gradually increased as the pressure plate 53 is raised.

Incidentally, the link 27 and the first spring member 6
1 and the second spring member 62 are the first in the present invention.
It constitutes the elastic means. However, the first elastic means may be only the link 27 and the first spring member 61 or the second spring member 62, and the spring member is not limited to the coil spring. Rubber or the like can also be used.

As shown in FIG. 9, the main body case 32
A window 70 is formed on the front surface of the pressure plate 53, and a part 53a of the pressure plate 53 extends in the vicinity of the window 70 so that the up-and-down position of the pressure plate 53 can be visually recognized from the outside. You can see the remaining charge.

Further, projecting portions 71 formed by cutting out the periphery are formed at two positions on both sides of the pressure plate 53 on the front and rear sides, that is, four positions in total. 1 to 3 in relation to this protruding portion 71.
A pressure plate lock mechanism as shown in FIG.

As shown in FIG. 1, this pressure plate locking mechanism 7
Reference numeral 2 denotes a slide member 73, a compression coil spring 74 that urges the slide member 73 in a predetermined direction and forms a second elastic means of the present invention, and a connecting member that is connected to the slide member 73 outside the main body case 32. And 75.

When the pressure plate 53 is pushed into the slide member 73 against the urging force of the first spring member 61 and the second spring member 62, the taper portions 76 and 76 which come into contact with the protruding portion 71 of the pressure plate 53. At the ends of these tapered portions 76, 76, claw portions 77, 77 cut out so that the protruding portion 71 of the pressure plate 53 engages, and an opening 78 for inserting the compression coil spring 74. And body case 3
Through the elongated holes 79, 79 provided in 2, the connecting portions 80, 80 projecting to the outside of the main body case 32 are formed.

A guide 81 is provided on the bottom wall of the main body case 32 to slidably hold the slide member 73 between the slide member 73 and the side wall of the main body case 32. The spring property is provided by 82, and when the slide member 73 is mounted, it can be pushed down. A protrusion 83 for receiving one end of the compression coil spring 74 is formed at a predetermined position on the side wall of the main body case 32.

A wall 38 provided outside the main body case 32
An elongated hole 84 located between the protrusions 37 is formed on the upper surface of the. The connecting member 75 is composed of an elongated plate having a thickness that is inserted between the side wall of the main body case 32 and the wall 38.
A projecting piece 85 is formed at the center of the upper side, and the connecting member 7
5 is inserted between the side wall of the main body case 32 and the wall 38, the protruding piece 85 passes through the elongated hole 84 and the wall 38 is inserted.
It is designed to project to the upper surface of. The connecting portions 80, 80 of the slide member 73 are the long holes 7 of the body case 32.
After being taken out through 9, 79, the connecting member 75
The holes 86, 86 are fitted and fixed.

2 and 3 show the state in which the slide member 73, the compression coil spring 74, and the connecting member 75 are assembled to the main body case 32 in this way. Compression coil spring 7
4 has one end locked to the protrusion 83 of the main body case 32 and the other end locked to the inner end of the opening 78 of the slide member 73, thereby urging the slide member 73 in the protruding direction of the claw 77. are doing. Further, the slide member 73 can be moved by moving the protruding piece 85 of the connecting member 75 as shown by an arrow B in FIG.

In the case of this embodiment, the protruding piece 85 increases the sliding amount of the pressing plate 35 when the pressing plate 35 is slid so that the claw 36 thereof is engaged with the projection 37 of the main body case 32. The slide member 73 is pushed by the pawl 36 by the force of the compression coil spring 74, and slides the slide member 73.

Therefore, a slide click mechanism as shown in FIG. 13 is provided between the pressing plate 35 and the lid 34. That is, the lid 34 has a first protrusion 91 protruding upward for restricting a slide stroke of the pressing plate 35, and a slit 92 formed in a U shape when viewed from above.
It has a tongue piece 93 which is separated into a tongue piece by means of, and which has elasticity in the vertical direction, and a second projection 94 formed on the upper end of the tip of this tongue piece 93.

On the other hand, on the lower surface of the pressing plate 35, a cross section formed at a predetermined interval so that the concave portion 95 in which the first protrusion 91 is loosely fitted and the second protrusion 94 are sequentially engaged with a click feeling. Arc-shaped grooves 96, 97, 98 are formed.

The holding plate 35 is slidable within a range in which the first projection 91 engages with both ends of the recess 95, and the second projection 94 is sequentially fitted into the grooves 96, 97, 98 in the sliding step. The sliding position of the pressing plate 35 is regulated with a click feeling. Then, for example, when the second protrusion 94 is fitted in the groove 96, the claw 3 of the pressing plate 35 is
6 is disengaged from the protrusion 37 of the main body case 32, and the second protrusion 94
When the claw 36 of the holding plate 35 is engaged with the projection 37 of the main body case 32 when the claw 36 is fitted in the groove 97, and the claw 36 of the pressing plate 35 is claw 36 of the locking mechanism when the second projection 94 is fitted in the groove 98. Pushing the protruding piece 85 of the connecting member 75 of the slide member 73
Is slid against the compression coil spring 74.

Reference numeral 100 in FIG. 9 indicates the pressure plate 5.
It is a counter that measures the number of times 3 is pushed down. A projecting piece 101 extending from the pressure plate 53 is connected to the measuring lever of the counter 100, and each time the pressure plate 53 is pushed down, the count number is increased by one, and the count number is displayed through a window portion (not shown) of the main body case 32. It is supposed to do. It should be noted that this count number corresponds to the number of times the chemical liquid injector is used in normal use, and accordingly,
The degree of fatigue of the spring member 61 and the second spring member 62 is taken into consideration, and this is used as a guide for knowing the parts replacement timing and the like.

Next, a method of using this chemical liquid injector will be described. As shown in FIG. 12, a drug solution administration tube 15
Is connected to the base end portion 14 a of the connecting needle 14. A drug solution injection needle is connected to the opposite end of the drug solution administration tube 15 via a flow control valve, an air filter or the like (not shown).

On the other hand, the holding lid 35 is slid so that the claws 36 of the holding lid 35 are located between the protrusions 37 of the main body case 32 of the chemical liquid bag containing case 31. In this state, the pressing lid 35 and the lid 34 are attached to the pivotal attachment portion 33 of the lid 34.
The lid 34 is opened by rotating the lid 34 upward through.

When the pressure plate 53 disposed inside the main body case 32 is pushed down, the protruding portion 71 (see FIG. 9) of the pressure plate 53 is tapered by the slide member 73 of the pressure plate lock mechanism 72 (see FIGS. 1 to 3). It abuts against the portion 76 and slides the slide member 73 rearward against the biasing force of the compression coil spring 74. When the pressure plate 53 is further pushed down, the protruding portion 71 of the pressure plate 53 gets over the end of the taper portion 76, and the slide member 73 is returned by the urging force of the compression coil spring 74, so that the protruding portion 71 of the pressure plate 53 becomes a claw portion of the slide member 73. 7
Engage the lower surface of 7. As a result, the pressure plate 53 is locked in the depressed state.

Next, the liquid medicine bag 12 containing the liquid medicine is set in the main body case 32, and the neck portion of the mouth portion 13 thereof is provided with two grooved ribs 4 arranged rearward in this embodiment.
It is inserted into the groove of 3, 44 (see FIG. 9). As a result, the mouth portion 13 engages with the front surface of the grooved rib 43 and can be held so as not to move rearward. Depending on the diameter of the mouth portion 13, it may be engaged with the foremost grooved rib 42 or the rearmost grooved rib 44.

In this state, the connecting needle 14 (see FIG. 12) is pierced into the mouth portion 13 of the liquid medicine bag 12, and the base portion 14a of the connecting needle 14 and the liquid medicine administration tube 15 are attached to the main body case 32.
The guide member 45 is inserted into the groove 47 of the plate member 46 inserted into the guide groove 45 and the insertion portion 49 of the tubular member 50 attached to the plate member 46. At this time, the rotation angle of the tubular member 50 with respect to the plate member 46 is set so that the released portion of the concave groove 47 and the insertion portion 49 coincide with each other.

As a result, the drug solution administration tube 15 is pulled out through the cutout portion 40 of the main body case 32, and the flange portion 14b of the connecting needle 14 engages with the front surface of the plate member 46. Further, when the tubular member 50 is rotated in this state, the plate member 46 is restricted from rotating in the guide groove 45, so only the tubular member 50 rotates and the groove 47 of the plate member 46. The open portion of can be surrounded by the peripheral wall of the tubular member 50. Therefore, it is possible to prevent the connecting needle 14 from being pulled out upward and the flange portion 14b and the plate member 46 from being disengaged.

Thus, the chemical solution bag 12 is attached to the main body case 3
After being housed in 2, the lid 34 and the pressing plate 35 are closed, and the pressing plate 35 is slid so that its claw 36 is engaged with the projection 37 of the main body case 32 as shown in FIG. At this time, the protrusion 94 in FIG. 13 fits into the groove 97. As a result, the lid 34 is attached to the main body case 3 by the pressing plate 35.
The second opening is kept closed.

Then, the injection needle connected to the tip of the drug solution administration tube 15 is pierced into the vein of the patient, and the pressing plate 35 is pressed.
13 by sliding the projection 94 in FIG. 13 into the groove 9
Fit to 8. At this time, the connecting member 7 of the pressure plate lock mechanism 72 (see FIGS. 1 to 3) is moved by the claw 36 of the pressing plate 35.
5 is pushed, the slide member 73 slides rearward against the biasing force of the compression coil spring 74,
The protruding portion 71 of the pressure plate 53 is disengaged from the claw 77 of the slide member 73, and the pressure plate 53 is unlocked.

As a result, the pressure plate 53 is moved by the biasing force of the first spring member 61 and the second spring member 62.
Press. A buffer material may be interposed between the pressure plate 53 and the chemical bag 12 to cause the pressing force of the pressure plate 53 to act uniformly on the chemical bag 12. Examples of such a cushioning material include a bag filled with a liquid, a gas, a sol-like substance, beads, etc., a plate made of foamed synthetic resin, a soft elastomer, a gel-like substance, a fibrous sheet or plate such as felt, etc. Is preferably used.

When the liquid medicine bag 12 is pressed by the pressure plate 53, the liquid medicine flows out into the connecting needle 14 through the liquid medicine inlet 14c of the connecting needle 14 pierced in the mouth portion 13, and passes through the liquid medicine administration tube 15 and an injection needle (not shown) to the patient. , Etc. Then, as the liquid medicine in the liquid medicine bag 12 flows out, the pressure plate 53 gradually moves toward the lid plate 34, and its position can be visually recognized through the window 70 of the main body case 32, so that the remaining amount of the liquid medicine can be known. . The mouth 13 of the liquid medicine bag 12 and the connecting needle 14 pierced by the mouth plate 13 also move with the movement of the pressure plate 53, but as shown in FIG. 4, notches provided in the main body case 32 and the lid 34. Since the portions 40 and 41 are elongated vertically, the connecting needle 14 can be moved.

After the administration of the drug solution is completed in this way, the injection needle is removed from the patient, and the holding plate 35 is slid, so that FIG.
When the projection 94 in the is fitted into the groove 96,
The pawl 36 is located between the protrusions 37 of the main body case 32, and the engagement between the pawl 36 and the protrusion 37 is released. Then, the pressing plate 35 and the lid 34 are rotated with respect to the main body case 32 to open the lid 34. Further, the tubular member 50 is rotated to align the insertion portion 49 with the opening portion of the concave groove 47 of the plate member 46, and the connecting needle 14 is pulled out from the mouth portion 13 of the liquid medicine bag 12 and removed upward.

In the above embodiment, the lock mechanism 72 is used.
The projection piece 85 is pushed by the claw 36 of the pressing plate 35 to move the slide member 73 to unlock the pressure plate 53. For example, the projection piece 85 is projected to a position where it can be easily operated from the outside. The lock may be released by directly pushing the piece 85 by hand.

[0056]

As described above, according to the present invention,
When the chemical liquid bag storage case is opened and the pressure plate is pushed down against the first elastic means, a predetermined portion of the pressure plate comes into contact with the taper portion of the slide member, and the slide member moves against the second elastic means to move the pressure plate. When the above-mentioned point has passed over the end of the tapered portion, the slide member returns due to the urging force of the second elastic means, so that the pressure plate engages with the claw portion of the slide member and is locked. Therefore, since the pressure plate can be maintained in a depressed state, the chemical solution bag can be installed easily and reliably. Then, the drug solution bag is installed to close the drug solution bag storage case, and the injection needle of the drug solution administration tube connected to the drug solution bag is pierced into the patient's vein or the like, and then the portion connected to the slide member is removed from the drug solution bag storage case. By moving from the outside and unlocking the pressure plate,
The first elastic means can press the pressure plate against the liquid medicine bag to start administration of the liquid medicine.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a pressure plate locking mechanism in a chemical liquid injector according to an embodiment of the present invention.

FIG. 2 is a perspective view of the pressure plate lock mechanism as viewed from the inside.

FIG. 3 is a perspective view of the pressure plate lock device seen from the outside.

FIG. 4 is a front view of a drug solution bag storage case in the drug solution injector.

FIG. 5 is a plan view of the liquid medicine bag storage case.

FIG. 6 is a side view of the liquid medicine bag storage case.

FIG. 7 is a back view of a holding plate of the same liquid bag containing case.

8 is a cross-sectional view taken along the line AA ′ in FIG.

FIG. 9 is a plan view showing an internal structure of the chemical liquid injector.

FIG. 10 is a front cross-sectional view showing an engagement structure of a lid body and a pressing plate of a drug solution bag storage case in the drug solution injector.

FIG. 11 is a side sectional view showing the internal structure of the same liquid injector.

FIG. 12 is an exploded perspective view showing a holding structure of a connecting needle in the same liquid injector.

FIG. 13 is a presser plate 35 and a lid 34 in the same liquid injector.
It is a fragmentary sectional view showing a slide click mechanism between and.

FIG. 14 is an explanatory diagram showing an example of a conventional drip device.

[Explanation of symbols]

 12 Chemical Liquid Bag 31 Chemical Liquid Bag Storage Case 32 Main Body Case 33 Pivoting Portion 34 Lid Body 35 Holding Plate 53 Pressure Plate 55 Slit 57 Links 58, 59 Support Shaft 60 Gear 61 First Spring Member 62 Second Spring Member 71 Projection 72 Pressure Plate Lock Mechanism 73 Sliding member 74 Compression coil spring 75 Connecting member 76 Tapered portion 77 Claw portion 78 Opening 79 Long hole 80 Connecting portion 81 Guide 83 Protrusion 84 Long hole 85 Protruding piece 86 Hole 91 First protrusion 92 Slit 93 Tongue 94 Second protrusion 95 recess 96, 97, 98 groove

Claims (2)

[Claims] 1. A liquid medicine injector comprising a liquid medicine bag containing case (31) and a pressing means for pressing the liquid medicine bag (12) contained in the liquid medicine bag containing case (31) to let out the liquid medicine. The pressing means presses the pressure plate (53) directly or indirectly abutted on the chemical liquid bag (12) via a cushioning material, and presses the pressure plate (53) toward the chemical liquid bag (12). The first elastic means (57, 61, 62), and the pressure plate (53) inside the chemical liquid bag storage case (31) is connected to the first elastic means (57, 61, 62). When pushed against, a tapered portion (76) that comes into contact with a predetermined portion of the pressure plate (53) and a claw portion (at the end of the tapered portion (76) with which the pressure plate (53) engages ( 7
And a slide member (73) having a slide member (7) is biased by the second elastic means (74) toward the claw portion (77) and is slidably provided, and is connected to the slide member (73). Part (80, 7)
5) is taken out to the outside through a long hole (79) formed in the drug solution bag housing case (31) that allows the slide member (73) to slide, and the drug solution bag housing case (31) is closed. In the state, the drug solution injector characterized in that the portions (80, 75) connected to the slide member (73) can be moved from the outside. 2. The chemical bag containing case (31) is
Main body case (32) for accommodating the drug solution bag (12)
And a cover plate (34) which is openably and closably covered on the main body case (32), and a holding plate (35) which is covered on the outer side of the lid body (34), and the holding plate (35) is Both sides (35a, 35b)
Is bent so as to cover both side surfaces of the lid body (34) from the outside, and the bent side portions (35a, 35).
b) A plurality of claws (3
6), and a plurality of protrusions (37) are formed at upper edges of both side walls of the main body case (32) at intervals so that the claws (36) can be inserted into the main body case (32). With the opening of 32) closed by the lid (34) and the pressing plate (35), the pressing plate (3)
By sliding 5), the claw (36) removably engages the lower surface of the protrusion (37), and the part (80, which is connected to the slide member (73) by the claw (36). 75) The chemical liquid injector according to claim 1, wherein 75) is pressed.