JPH10295812A - Medical liquid supply tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical liquid supply tool simple in structure and capable of adjusting the injection amount of one shot of a medical liquid corresponding to the state of a patient or the like. SOLUTION: This medical liquid supply tool is provided with a casing, a chamber 31 for storing the medical liquid, a diaphragm (elastic body) 7 for forming a part of it, a clamping member 8, the flow-in port 32b and flow-out port 33 of the liquid chemicals communicated with the chamber 31, a button 62 to be protoruded inside the chamber 31 by pressurizing the diaphragm 7, a spring 65 for energizing the button 62, a button housing 61 screwed with the button 62, an orifice for flow rate control and a flow rate changeover means 9 capable of setting the flow rate of the liquid chemicals in at least two stages. When the button 62 whose position is adjusted to the button housing 61 is pressurized against the energizing force of the spring 65, the diaphragm 7 is protruded inside the chamber 31, the capacity of the chamber 31 is reduced and the medical liquid by the portion of the reduction is ejected from the flow-out port 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drug solution supply device for supplying a drug solution such as an analgesic such as morphine, an insulin preparation, an antibiotic, an anticancer drug, and particularly for administering to a living body.

[0002]

2. Description of the Related Art For example, a drug solution injector (medical solution supply device) for administering a drug solution to a patient is used in a medical institution such as a hospital, and a patient himself / herself is administered at home or office. Some are used at the time. For example,
For pain management such as relief of post-operative pain and cancer pain,
2. Description of the Related Art It has been practiced to continuously inject a small amount of an analgesic such as morphine using a drug solution injector.

[0003] Such a liquid injector is mainly composed of a liquid supply source such as a balloon or a syringe pump having a function of storing the liquid and discharging the liquid, and a liquid supply line extended from the liquid supply. And a flow control device installed in the middle of the chemical supply line. The flow rate control device has an orifice having a small cross-sectional area of a flow path (having an extremely fine flow path), and controls a flow rate to a very small amount by a large pipe resistance when a chemical solution passes through the orifice.

[0004] By the way, when performing pain management, changes in the patient's symptoms are unpredictable, and sudden pain may occur even during the minute injection of analgesics. Therefore, in order to cope with this, a drug solution injector capable of performing one-shot injection for temporarily administering a large amount of an analgesic by operating the patient himself has been developed (Japanese Unexamined Patent Publication No. 63-501195). JP-A-5-15590).

[0005] These chemical injectors have a chamber for temporarily storing a chemical, and an inlet and an outlet for the chemical which communicate with the chamber. A mechanism is provided for sending out the stored chemical from the outlet.

[0006] However, these chemical liquid injectors have complicated structures such as a mechanism for performing one-shot injection and a connected circuit (pipe arrangement).
There is a drawback that the amount of the drug solution injected in one shot is fixed to a predetermined amount in advance, and the one shot injection amount cannot be adjusted or changed according to the patient's condition or the like.

More specifically, an analgesic such as morphine exerts an excellent analgesic effect at an early stage, but on the other hand, there is a side effect. 0.5 ml). Therefore, in some cases, even if one shot is performed, a sufficient analgesic effect may not be obtained, and the pain and anxiety of the patient cannot be eliminated.

[0008] The amount of the chemical solution flowing into the chamber is:
Since the flow rate is controlled by a small amount by the flow control device, once the one-shot injection is performed, it takes a long time for the chamber to be filled with the chemical solution again. For this reason, even if the analgesic effect is insufficient with one one-shot, it is not possible to immediately perform two or more consecutive one-shot injections immediately thereafter.

[0009] Further, such a problem arises other than the administration of an analgesic for pain management.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a chemical solution supply device which can adjust the injection amount of a one-shot chemical solution according to the condition of a patient and has a simple structure. .

[0011]

This and other objects are achieved by the present invention which is defined below as (1) to (9).

(1) A variable-volume chemical storage section for storing a chemical, an inlet and an outlet for the chemical connected to the chemical storage, and a volume of the chemical storage reduced to reduce the volume of the chemical in the chemical storage. Operating means for discharging the liquid from the outlet, and the operating means includes a discharge amount adjusting mechanism for adjusting the discharge amount of the chemical liquid.

(2) A variable-capacity drug storage portion for storing a drug solution, an elastic body defining a part of the drug solution storage portion, an inlet and an outlet for a drug solution communicating with the drug solution storage portion,
A pressing member that presses the elastic body to protrude or move to the inside of the drug solution storage section, and a biasing member that biases the pressing member, are provided to resist the biasing force of the biasing member. And a pressing operation to protrude or move the elastic body to the inside of the chemical storage section to reduce the volume of the chemical storage section, and discharge the chemical in the chemical storage section from the outlet. A chemical liquid supply device, comprising: a discharge amount adjusting mechanism that adjusts a state of insertion of the elastic body into the chemical liquid storage section to adjust a discharge amount of the chemical liquid from the outlet. .

(3) The chemical liquid supply device according to the above (2), wherein the discharge amount adjusting mechanism comprises a mechanism for adjusting a distance between the pressing member and the elastic body before pressing the pressing member.

(4) The discharge amount adjustment mechanism according to (2), wherein the discharge amount adjustment mechanism comprises a mechanism for adjusting a protrusion amount or a movement amount of the elastic body into the chemical solution storage portion before the pressing member is pressed. Chemical supply tool.

(5) The chemical liquid supply device according to any one of (1) to (4), wherein the elastic body is a film that can be elastically deformed by the pressing of the pressing member.

(6) The chemical supply device according to any one of (1) to (5), wherein a one-way valve for regulating the flow direction of the chemical in one direction is installed downstream of the outlet.

(7) The apparatus according to the above (1), further comprising a flow rate control means for controlling a flow rate of the chemical solution flowing into the chemical solution storage section to a very small amount.
The chemical solution supply device according to any one of (6) to (6).

(8) The chemical solution supply device according to the above (7), wherein the flow rate control means includes at least one orifice formed of a very fine flow path.

(9) The chemical solution supply device according to any one of (1) to (8), further comprising a flow rate switching means capable of setting a flow rate of the chemical solution flowing into the chemical solution storage section in at least two stages.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a chemical supply device according to the present invention.

FIGS. 1 and 2 are cross-sectional side views showing an embodiment of the chemical solution feeder of the present invention, FIG. 3 is an exploded view of the chemical solution feeder shown in FIG. 1, and FIG. 4 is shown in FIG. FIGS. 5, 6, and 7 are plan views of the chemical solution supply device, respectively, showing a state where an upper cover of the chemical solution supply device shown in FIG. 1 is removed.

The left side in FIGS. 1 to 7 is the "upstream side",
The right side is referred to as “downstream side”, the upper side in FIGS. 1 to 3 is described as “upper”, and the lower side is described as “lower”.

As shown in FIGS. 1 to 7, the chemical solution feeder 1 A of the present invention mainly comprises a first lower case 3 and a second lower case 4.
And a casing 2 composed of an upper case 5 mounted on these components.

The first lower case 3 is formed with a chamber (chemical solution storage section) 31 for storing a chemical solution, and inlets 32 a and 32 b and an outlet 33 for the chemical solution communicating with the chamber 31.

The chamber 31 is defined by a cylindrical concave portion formed at the center of the first lower case 3 and the diaphragm 7 mounted on the concave portion. Although the volume of the chamber 31 is not particularly limited, it is usually 0.3 to 5.0 ml.
The amount is preferably about 2.0 to 3.0 ml.

The second lower case 4 is joined to the upstream side of the first lower case 3 and accommodates a flow rate switching means 9 described later between the second lower case 4 and the upper case 5. A recess 41 serving as a bearing for the operation dial 91 of the flow rate switching means 9 is formed on the inner surface of the bottom of the second lower case 4. At the corresponding position of the upper case 5, an opening 56 serving as a bearing for the operation dial 91 is also formed.

On the downstream side of the upper case 5, a protruding portion 51 protruding upward is formed. The protruding portion 51 controls the discharge amount of the chemical Q from the outlet 33 when performing one-shot injection. An operation means 6 having a discharge amount adjusting mechanism for adjusting is housed.

That is, a circular opening 52 into which the button housing 61 is vertically movably inserted is formed at the top of the raised portion 51. In addition, a first stepped portion 5 at the lower end of the opening 52 such that the cross-sectional area of the opening 52 is increased.
3 and a second step portion 54 that further increases the cross-sectional area.
Are formed.

The button housing 61 is a ring-shaped member, and a female screw 67 is formed on the inner peripheral surface thereof.

The button (presser) 62 corresponds to a pressing member that presses the diaphragm 7 to project it into the inside of the chamber 33, and has a contact surface at the lower end thereof that contacts the membrane 72 of the diaphragm 7. It is composed of a substantially columnar member having 63.

On the outer peripheral surface of the upper part of the button 62, a male screw 66 screwed with the female screw 67 is formed. When the male screw 66 is screwed with the female screw 67, the button 62 is inserted inside the button housing 61.

By adjusting the direction and amount of rotation of the button 62 with respect to the button housing 61, the vertical position of the button 62 with respect to the button housing 61, that is, the distance (separation distance) between the button 62 and the diaphragm 7 is adjusted. Is set. In the state shown in FIG. 1, the contact surface 63 of the button 62 and the film 72 of the diaphragm 7
In the state shown in FIG. 2, the contact surface 63 of the button 62 is separated from the film 72 by a predetermined distance.

When the button 62 is pressed, the diaphragm 7 is pressed.
Is projected inside the chamber 31, the chamber 3
1 temporarily decreases and the liquid Q in the chamber 31
Is discharged from the outlet 33, and the discharge amount corresponds to the vertical position of the button 62 with respect to the button housing 61.

In this embodiment, since the discharge amount adjusting mechanism is provided by screwing the female screw 67 and the male screw 66, the vertical position of the button 62 with respect to the button housing 61, that is, the pressing operation of the button 62 is performed. The projection amount (insertion state) of the membrane 72 of the diaphragm 7 into the chamber 31 at the time of (one-shot injection operation) can be adjusted steplessly, whereby the discharge amount of the chemical solution Q from the outlet 33 can be adjusted. Can be adjusted.

Further, since the discharge amount adjusting mechanism is a mechanism for adjusting the distance (separation distance) between the button 62 and the diaphragm 7, it is possible to discharge the chemical solution Q from the chamber 31 at any time (for example, by injecting a small amount of liquid). (Even when) you can make that adjustment.

On the upper surface of the button 62, a groove 64 for rotating the button 62 with respect to the button housing 61 is formed. For example, a coin or a screwdriver is inserted into the groove 64, the button 62 is rotated with respect to the button housing 61, and its vertical position is adjusted and set.

The chemical supply device 1A is provided with a rotation stopping mechanism for preventing the button housing 61 from rotating with respect to the upper case 5 when the button 62 is rotated as described above. That is, as shown in FIG.
On the outer peripheral surface of the button housing 61, a pair of grooves 611 extending in the up-down direction in FIG.
A ridge 55 to be inserted into the groove 611 is formed at a position corresponding to the groove 611. When the button housing 61 is moved in the vertical direction, the ridge 55 slides along the groove 611 to move the button housing 61. Although it is possible, when stress in the rotation direction acts on the upper case 5 of the button housing 61, the ridge 5
Since the groove 5 and the groove 611 are engaged with each other, the rotation is prevented. Thus, the button housing 61 can move only in the vertical direction in FIG.

The button housing 61 and the button 62 held by the button housing 61 are urged upward by a coiled spring (biasing member) 65 in a compressed state.

The upper end of the spring 65 is
The lower end of the spring 65 is in contact with the upper surface of the holding member 8 when inserted into a spring seat 612 formed of a ring-shaped recess formed in the first member 1. When the spring 65 contracts most, the spring 65
Are stored in the spring seat 612 in whole or in large part.

At the outer periphery of the lower end of the button housing 61,
The button housing 61 formed with the flange 613 and urged upward by the spring 65 is provided with the flange 61.
By engaging the first step portion 53 with the third step portion 53, the upper limit of the upward movement is restricted.

The diaphragm 7 has a ring-shaped rim 71
And a film (thin portion) 72 formed on the inside thereof. The diaphragm 7 seals the upper surface opening of the cylindrical recess formed in the first lower case 3 in a liquid-tight manner, that is, the upper surface (part) of the chamber 31.
Is defined.

The diaphragm 7 may be made of various rubber materials such as natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, butyl rubber, silicone rubber, and fluoro rubber, and polyurethane, polyester, polyamide and the like. It is preferable to be made of an elastic body (elastic material) such as a thermoplastic elastomer. Among them, silicone rubber is particularly preferable because of its high stability to the chemical solution Q.

The diaphragm 7 is used for the first lower case 3
And a ring-shaped holding member 8 located on the upper side thereof, thereby maintaining the liquid tightness of the upper part of the chamber 31. That is, the rim portion 71 of the diaphragm 7 is inserted into the concave portion 81 formed by the ring-shaped groove formed in the first lower case 3 and the holding member 8 in a state where the rim portion 71 is compressed in the vertical direction, and The film 72 near the inner side of the rim portion 71 is sandwiched between the lip 34 formed on the upper outer peripheral edge of the chamber 31 of the first lower case 3 and the lower surface of the sandwiching member 8.

In this case, the outer peripheral portion of the holding member 8 is engaged with the second step portion 54 of the upper case 5 and receives a pressing force downward from the second step portion 5, whereby the first lower case 5 3 and the holding member 8 have a holding force. Therefore, the diaphragm 7 holds the holding member 8 between the first lower case 3 and the upper case 5.
Is sandwiched between the two.

A circular opening 82 through which the button 62 can be inserted is formed in the center of the holding member 8.

The first lower case 3 has a pair of inflow ports 32 a and 32 b communicating with the chamber 31 and an outflow port 33.

The downstream ends of the first tube 10a and the second tube 10b are fitted in the inlets 32a and 32b, respectively, in a liquid-tight manner. Further, in the lumens at the downstream end of the first tube 10a and the second tube 10b, tips 1 each forming an orifice 11a are provided.
2a and the tip 12b forming the orifice 11b are fitted in a liquid-tight manner. These chips 12a, 12b are:
It constitutes a flow control means.

The orifices 11a and 11b are respectively
The cross-sectional area is constituted by a flow path having a very small diameter (a pipe having an extremely small inner diameter). When the chemical Q passes through the orifices 11a and 11b, a large pipe resistance (viscous resistance) is received from the pipe inner surface, and the flow rate is reduced. It is controlled to a very small amount.

In this case, the orifice 11a and the orifice 11b have different cross-sectional areas of the flow path. That is, the cross-sectional area of the flow path of the orifice 11a is smaller than the cross-sectional area of the flow path of the orifice 11b, thus, the flow rate V ₁ of the chemical solution Q passing through the orifice 11a orifice 11
flow rate V ₂ is less than the chemical Q passing through b.

The flow rate of the chemical solution Q controlled by the orifices 11a and / or 11b is not particularly limited, but is, for example, about 0.2 to 25.0 ml / hour.

The first tube 10a and the second tube 1
The upstream end of Ob is connected to a tube 14 via a Y-shaped connector 13. The tube 14 protrudes out of the casing 2, and the upstream end of the tube 14 is connected to a chemical solution supply source (not shown) such as a syringe pump or a balloon.

On the downstream side of the outlet 33, there is provided an enlarged portion 35 whose inner diameter is enlarged.
Are inserted in a liquid-tight manner.

The chemical Q
A one-way valve (check valve) 16 that regulates the flow of air in one direction from the upstream side to the downstream side is provided. This prevents the chemical solution Q from flowing backward and flowing into the chamber 31 via the outlet 33.

Downstream of the connector 15 is a tube 17.
Is connected. A puncture needle (not shown) is attached to the downstream end of the tube 17, for example, and the puncture needle can be punctured into a blood vessel or epidura of a patient to administer the drug solution Q.

The first tube 10a, the second tube 10b, and the tubes 14, 17 each preferably have flexibility (flexibility). The constituent materials thereof include, for example, soft polyvinyl chloride and polyethylene. And various resins such as polypropylene, ethylene-vinyl acetate copolymer, and various rubbers such as silicone rubber. First
Tube 10a, second tube 10b, tube 14,
The inner surface of 17 can be subjected to a surface treatment that does not adversely affect the chemical solution Q (particularly, formation of a coating layer). The purpose of the surface treatment is optional. For example, a hydrophilic layer may be formed for the purpose of forming a barrier layer for preventing the organic components in the tube constituent material from being eluted into the chemical solution Q or for preventing air blocking. No.

The flow rate switching means 9 is provided between the operation dial 91 having the closing part 92 and the closing part 92.
It comprises receiving members 94a and 94b for closing the Oa and the second tube 10b, respectively, and positioning means 95 for positioning the operation dial 91 in the rotation direction.

The operation dial 91 is rotatably supported with respect to the casing 2 by a concave portion 41 functioning as a bearing and an opening 56, and below the first tube 1.
A cam-shaped press-closing portion 92 that can selectively close the first tube 0a and the second tube 10b is formed. In addition, a grip portion 93 that grips the operation dial 91 to rotate the operation dial 91 is formed above the operation dial 91.

The receiving members 94a and 94b are respectively installed in contact with the inner surface of the side wall on the upstream side of the casing 2. Each of the receiving members 94a and 94b is formed with a protrusion 941 protruding toward the operation dial 91. The first tube 10a and the second tube 10b are closed by the protrusion 941 and the closing portion 92 of the operation dial 91, and the lumen (internal flow path) is closed.

In this embodiment, the receiving members 94a, 94
Although b is integrated with the second lower case 4, it may be a separate member.

The positioning means 95 comprises three recesses 96a, 96b, 96c formed at substantially equal intervals on the outer peripheral surface of the operation dial 91 on the side opposite to the press-closing portion 92, and the leading ends of the recesses 96a, 96b, 96c. , A coil spring 98 for urging the pin 97 toward the operation dial 91, and a stopper 99.

The pin 97 and the spring 98 are inserted into the hole 43 of the support part 42 erected from the bottom of the second lower case 4, and the tip of the pin 97 projects from the downstream end of the hole 43. ing. The upstream end of the hole 43 is provided with a stopper 9.
9 is fitted and sealed. Pin 97 and stopper 99
The spring 98 is inserted in a compressed state between the
To the downstream side.

The tip of the pin 97 is urged by a spring 98 and inserted into one of the recesses 96a, 96b, 96c. In this state, the position of the operation dial 91 in the rotation direction is stopped, and positioning is performed. .

That is, the position of the operation dial 91 in the rotation direction is set in three stages by the positioning means 95 (see FIGS. 5 to 7).
The pattern in which Oa and the second tube 10b are closed and sealed is selected, and the flow rate of the chemical solution Q is set.

That is, in the state where the tip of the pin 97 is inserted into the central concave portion 96b (reference position), both the first tube 10a and the second tube 10b are not pressure-closed. 1 tube 10a and 2nd
Flows through both tubes 10b, through orifices 11a and 11b, and into inlets 32a and 32b.
, And flows into the chamber 31. Accordingly, the flow rate V ₃ of liquid Q at this time is the approximately equal to the sum of the flow rate V ₁ and the flow rate V _2, the maximum flow rate.

When the tip of the pin 97 is inserted into the recess 96a, only the first tube 10a of the first tube 10a and the second tube 10b is closed. It flows through the tube 10b, passes through the orifice 11b, and flows into the chamber 31 via the inlet 32b. The flow rate of the chemical liquid Q at this time is the flow rate V _2.

When the tip of the pin 97 is inserted into the concave portion 96c, only the second tube 10b of the first tube 10a and the second tube 10b is closed, so that the chemical solution Q It flows through the tube 10a, passes through the orifice 11a, and flows into the chamber 31 via the inlet 32a. The flow rate of the chemical solution Q at this time is the flow rate V ₁ (<V ₂ ).

As described above, the flow rate switching means 9 selects the flow pattern of the chemical solution Q to each of the two orifices 11a and 11b, so that the flow rate of the chemical solution Q becomes V ₁ ,
V _2, V ₃ (they satisfy the relationship of _{V 1 <V 2 <V 3} ) can be set to three stages.

A scale 18 indicating the position of the operation dial 91 in the rotation direction, that is, the magnitude of the flow rate of the chemical solution Q is formed.

The drug solution Q supplied by the drug solution supply device 1A of the present invention is appropriately selected depending on the purpose of use, for example, an analgesic such as morphine (narcotic analgesic), an insulin preparation, an antibiotic, an anticancer drug. And local narcotics. In addition, the kind of the chemical solution Q is not limited to this,
For example, those which do not exert a direct medicinal effect, such as physiological saline, electrolyzed water, a washing solution, an anticoagulant and a contrast agent, are also included.

Next, the operation of the chemical liquid supplier 1A will be described. First, the injection of a small amount of a chemical solution will be described.

At the time of injecting a small amount of the drug solution, the operation dial 91 is turned while holding the grip portion 93, and the state shown in FIG. 5 (the end of the pin 97 is inserted into the recess 96b) and the state shown in FIG. The state shown (the tip of the pin 97 is
7 or the state shown in FIG. 7 (the state in which the tip of the pin 97 is inserted into the recess 96c), and the chemical Q is supplied from the upstream side of the tube 14. After a lapse of a predetermined time, the liquid Q
And primed.

When the operation dial 91 is set to the state shown in FIG. 5 (reference position), the chemical Q passing through the tube 14 is diverted by the Y-shaped connector 13, and the first tube 10a and the second tube Flow through each of 10b,
After passing through the orifices 11a and 11b, the inlet 32a
And 32b flows into the chamber 31. Thereby, the liquid medicine Q stored in the chamber 31 having substantially the same amount as the inflow flows out from the outlet 33, is sent to the downstream side through the one-way valve 16 and the tube 17, and is administered to the patient. . At this time, the chemical Q flowing out of the outlet 33
Is the above V ₃ (= V ₁ + V ₂ ).

When the operation dial 91 is set to the state shown in FIG. 6, the chemical Q from the tube 14
It flows through the second tube 10b through the U-shaped connector 13, passes through the orifice 11b, and flows into the chamber 31 through the inflow port 32b. As a result, the chemical solution Q stored in the chamber 31 having substantially the same amount as the inflow amount becomes the outlet 3
3, flows downstream through the one-way valve 16 and the tube 17, and is administered to the patient. At this time, the flow rate of the chemical liquid Q flowing out from the outlet 33 is the V _2.

When the operation dial 91 is set to the state shown in FIG. 7, the chemical solution Q from the tube 14
It flows through the first tube 10a via the U-shaped connector 13, passes through the orifice 11a, and flows into the chamber 31 via the inflow port 32a. As a result, the chemical solution Q stored in the chamber 31 having substantially the same amount as the inflow amount becomes the outlet 3
3, flows downstream through the one-way valve 16 and the tube 17, and is administered to the patient. At this time, the flow rate of the chemical liquid Q flowing out from the outlet 33 is the V _1.

As described above, the liquid Q to be injected and administered is
Flow rates V ₁ , V ₂ , V ₃ (these are V ₁ <V ₂ <V
₃ ) can be set in three stages.

Next, one-shot injection of a chemical solution will be described. Note that this one-shot injection can be performed even when the operation dial 91 is in any of the states shown in FIGS. 5, 6, and 7, but hereinafter, typically, the operation dial 91 is brought into the state shown in FIG. A description will be given taking a certain time as an example.

First, as a preparatory operation, the discharge amount adjusting mechanism is set. The button 62 is rotated by a predetermined amount in the predetermined direction with respect to the button housing 61, and the position of the button 62 in the vertical direction with respect to the button housing 61 is adjusted and set. FIG.
In the state shown in (1), the discharge amount of the chemical solution when one-shot injection is performed is set to the maximum value. Further, in the state shown in FIG. 2, the button 62 is located at a position higher than that in FIG. 1 (a state where the contact surface 63 and the film 72 are not in contact with each other), and the discharge amount of the chemical solution when one-shot injection is performed Is set smaller than the maximum value.

When such adjustment is completed, the button 62 is pressed downward with a finger or the like against the urging force of the spring 65. As a result, as shown by the dotted lines in FIGS. 1 and 2, the membrane 72 of the diaphragm 7 is pressed by the contact surface 63 of the button 62 and deforms so as to protrude into the chamber 31, and the volume of the chamber 31 is reduced. I do. Therefore, the liquid medicine Q in the chamber 31 corresponding to the reduced amount is discharged from the outflow port 33, sent to the downstream side via the one-way valve 16 and the tube 17, and administered to the patient.

At this time, the discharge amount (one-shot injection amount) of the chemical solution is adjusted and set by the vertical position of the button 62 with respect to the button housing 61 as described above. For example, in the state shown in FIG. 1, a maximum discharge amount is obtained, and in the state shown in FIG. 2, a smaller predetermined discharge amount is obtained.

When the volume of the chamber 31 decreases due to the projection of the membrane 72 of the diaphragm 7, the orifice 11
Due to the large line resistances of a and 11b, the chemical solution Q in the chamber 31 does not flow back to the upstream side through the inlets 32a and 32b, or the amount thereof is negligibly small.

The discharge amount of the chemical solution in such one-shot injection (one-shot injection amount) is, for example, 10 to 10 times the volume of the chamber 31 per one-shot injection.
It can be about 100%.

When the pressing force on the button 62 is released, the button 62 is raised by the urging force of the spring 65 and returns to the original position. At this time, the film 72 of the diaphragm 7 also attempts to return to the original flat shape by the restoring force, so that the pressure in the chamber 31 decreases. However, due to the backflow preventing action of the one-way valve 16, the liquid medicine Q in the tube 17 flows toward the upstream side, and does not flow into the chamber 31 via the outlet 33.

After the one-shot injection, a small amount of the chemical liquid flows into the chamber 31 via the first tube 10a, the orifice 11a, and the inlet 32a, and the chemical liquid Q gradually fills the chamber 31. At this time,
As described above, since the pressure in the chamber 31 is reduced, the pressure difference between the upstream side and the downstream side of the orifice 11a increases, and the flow rate of the chemical solution Q into the chamber 31 slightly increases.

However, if it is desired to more quickly fill (prime) the chemical solution Q into the chamber 31, the operation dial 91 is rotated to change the operation dial 91 as shown in FIG.
State. For example, in the state shown in FIG.
The chemical solution Q flows into the chamber 31 through both the orifices 11a and 11b, and a large flow rate is obtained in combination with the reduced pressure in the chamber 31. Therefore, the priming of the chemical solution Q to the chamber 31 in a shorter time. Can be completed.

For example, the orifices 11a, 11b
It is also possible to remove one of them and control the flow rate by the other orifice to inject a small amount of the chemical Q. In this case, of the first tube 10a and the second tube 10b, the tube in which the orifice is not installed is closed and closed by the closing unit 92, and a small amount of the chemical solution Q is injected. 31
When the liquid Q is primed, the priming can be completed instantaneously by releasing or relaxing the pressure closing and closing of the tube having no orifice.

As described above, since the flow rate switching means 9 is combined with the operating means 6 in the chemical liquid supply device 1, after the one-shot injection is performed, the chemical liquid Q
Priming time (priming speed) can be adjusted, and in particular, there is an advantage that this time (time until the next one-shot injection can be performed) can be shortened.

When the priming of the chemical solution Q into the chamber 31 is completed, the operation dial 91 is returned to the original set position (the state shown in FIG. 7) or set to another position as necessary.

FIGS. 8 and 9 are cross-sectional side views showing another embodiment of the chemical supply device of the present invention, and FIG. 10 is an exploded view of the chemical supply device shown in FIG. The chemical supply device 1B shown in these figures is the same as the chemical supply device 1A, except that the configuration of the discharge amount adjusting mechanism is different. Hereinafter, differences will be mainly described, and description of similar items will be omitted. Note that the upper side in FIGS. 8 to 10 is described as “upper”, and the lower side is described as “lower”.

The chemical supply device 1B has a casing 2 composed of a lower case 30 and an upper case 50 mounted on the lower case 30.

A chemical solution storage tank 19 is fixedly installed in the lower case 30. The chemical solution storage tank 19 has a cylindrical concave portion defining a chamber (chemical solution storage section) 31, and An inflow port 32a, 32b and an outflow port 33 for the chemical solution communicating with each other are formed.

Tubes (not shown) similar to those described above are connected to the inlets 32a and 32b, respectively, and tips 12a and 12b having orifices 11a and 11b formed therein are respectively fitted into the tubes. ing.

The enlarged portion 35 of the outlet 33 has a connector 1
5 is fitted in a liquid-tight manner, and a one-way valve (check valve) 16 similar to the above is installed in the inside thereof. A tube (not shown) to the patient side is connected to the downstream end of the connector 15.

The chamber 3 is provided above the chamber 31.
A diaphragm 7 similar to the above and defining a part of the diaphragm 1 and a holding member 8 for holding the same between a diaphragm 19 and a chemical solution storage tank 19 are provided.

The chemical supply device 1B has the same operation dial 91 as described above, the flow rate switching means 9 including the receiving members 94a and 94b, and the positioning means 95.

In the raised portion 51 of the upper case 50, the operating means 20 having a discharge amount adjusting mechanism for adjusting the discharge amount of the chemical solution Q from the outlet 33 when performing one-shot injection is accommodated.

The discharge amount adjusting mechanism of the chemical liquid supply device 1B adjusts the state in which the membrane 72 of the diaphragm 7 projects (inserts) into the chamber 31 when the button (pressing member) 21 is pressed. In particular, the chamber 31 of the membrane 72 before the pressing operation of the button 21 can be performed.
The volume of the chamber 31 is set in advance by adjusting the amount of protrusion into the inside. Hereinafter, the configuration will be described.

The discharge amount adjusting mechanism comprises a button 21, a first button guide 22, a second button guide 23, and coiled springs 24 and 25 in a compressed state.

The button 21 includes a plate-shaped finger contact portion 211,
The second button guide 23 is fitted via a spring 24 having a body 212 and having a function of pushing back the button 21 upward. The button 21 and the second button guide 23 operate in cooperation with each other, and are installed so as to be movable and rotatable in the vertical direction with respect to the first button guide 22.

The first button guide 22 includes a flange 221 that engages with the inner surface of the top of the raised portion 51, and two sets of engaging portions 22 a, 22 b formed in a cylindrical portion below the flange 221 along the circumferential direction. 22c. Engaging part 22
a, 22b, and 22c are different in the position (height) of the button 21 in the moving direction.

The second button guide 23 has a spring 24
And a pair of claws 232 that selectively engage with any of the engaging portions 22a, 22b, and 22c.

The pawl portion 232 is engaged with the engaging portions 22a, 22b, 22
In the state of engagement with any one of (c) and (c), the engagement state is favorably maintained by the downward urging force acting on the claw portion 232 by the spring 24.

The lower end and the upper end of the first button guide 22 have the holding member 8 and the flange 221 respectively.
Is urged upward by a spring 25 that abuts on the upper surface.

The button 21 is appropriately rotated and pressed downward, and the claw portion 232 is selected from any of the engaging portions 22a, 22b, and 22c to be engaged. With this selection, the vertical position of the button 21 with respect to the first button guide 22, that is, the insertion state of the membrane 7 of the diaphragm 7 into the chamber 31 can be set to another stage.

As shown in FIG. 8, the claw portion 232 is
When the button 21 is pressed downward against the urging force of the spring 25 in a state in which the button 21 is engaged with the uppermost engaging portion 22a of 2a, 22b and 22c, the membrane of the diaphragm 7 having a flat shape is formed. 72, as indicated by the dotted line in FIG.
The chamber 31 is pressed by the lower surface of the button guide 23.
It protrudes and deforms until it contacts or approaches the bottom surface of. As a result, the volume of the chamber 31 is reduced, and the liquid medicine Q in the chamber 31 is discharged from the outlet 33 in a relatively large amount, sent downstream via the one-way valve 16 and the tube, and administered to the patient.

As shown in FIG. 9, when the claw portion 232 is engaged with the lowermost engaging portion 22c of the engaging portions 22a, 22b, 22c, the membrane 72 of the diaphragm 7 is In the chamber 31, for example, the chamber 31
Projecting about half the height, and its volume is set small. When the button 21 is pressed downward against the urging force of the spring 25 in this state, the membrane 72 of the diaphragm 7 is pressed against the lower surface of the second button guide 23 as shown by a dotted line in FIG. The projection 31 deforms until it contacts or approaches the bottom surface of the base 31. As a result, the volume of the chamber 31 is further reduced, and the chemical solution Q in the chamber 31 flows out of the outlet 33.
The fluid is then discharged to the downstream via the one-way valve 16 and the tube, and is administered to the patient. At this time, the discharge amount of the chemical solution is smaller (for example, about half) than in the case shown in FIG.

When the button 21 is pressed in the same manner as described above with the claw portion 232 being engaged with the intermediate engaging portion 22b, an intermediate amount between the case shown in FIG. 8 and the case shown in FIG. Is discharged from the chamber 31 through the outlet 33 and is administered to the patient.

The other operations of the chemical supply device 1B are the same as those of the chemical supply device 1A.

FIG. 11, FIG. 12 and FIG. 13 are cross-sectional side views showing other examples of the flow rate switching means in the present invention. The flow switching means 26 shown in these figures
Is an operation lever 27 having a closing part 271 and a closing part 2
71, the first tube 10a and the second tube 1
0b, and positioning means 2 for positioning the operating lever 27 in the sliding direction.
9. The flow rate switching means 26 also includes flow rate control means (orifices 11a, 11b).
And other configurations are the same as those of the chemical liquid supply device 1A or 1B.

The operation lever 27 moves along rails 58 formed on both sides of the opening 57 of the upper case, as shown in FIGS.
It is installed so that it can slide in the lateral direction inside. Operation lever 2
7, a closing part 2 having an arcuate curved surface
The projection 71 is formed. The press-closing portion 271 has such a length as to be able to come into contact with both the first tube 10a and the second tube 10b in the width direction of the operation lever 27 (the direction perpendicular to the paper surface in the drawing). .

A projection 272 for sliding the operation lever 27 with a finger is formed on the upper portion of the operation lever 27.

Each of the receiving members 28a and 28b is
It is installed on the inner surface of the bottom of the lower case 4. Receiving member 28
Projections 281 and 282 projecting toward the operation lever 27 side are formed on a and 28b, respectively. In this case, the protrusion 281 and the protrusion 282 are installed at positions shifted by a predetermined distance in the sliding direction of the operation lever 27. The first tube 10a and the second tube 10b are closed by the protruding portions 281 and 282 and the closing portion 271 of the operation lever 27 to close the inner cavity (internal passage) and select a passage.

The positioning means 29 comprises convex portions 291 and 292 formed on the upper case 5 side, and concave portions 293 and 294 formed on the operation lever 27 side and can be fitted with the convex portions 291 and 292, respectively. Have been.

Next, the operation of the flow rate switching means 26 will be described. As shown in FIG. 11, in a state where the operation lever 27 is located at the center in the lateral direction in the figure (reference position), both the first tube 10a and the second tube 10b are not closed, and therefore, the chemical solution Q First tube 10a and second tube
Flows through both tubes 10b, through orifices 11a and 11b, and into inlets 32a and 32b.
Through the flowing in the flow V ₃ into the chamber 31. At this time, both ends of the operation lever 27 are convex portions 291, respectively.
292, and the position of the operation lever 27 is held.

As shown in FIG. 12, when the operation lever 27 is slid to the downstream side, only the first tube 10a of the first tube 10a and the second tube 10b is closed, so that the liquid Q It is a second tube 10b flows through the orifice 11b, through the inlet port 32b flows at the V ₂ into the chamber 31. At this time, the convex portion 291 and the concave portion 293 are fitted, and the position of the operation lever 27 is maintained.

As shown in FIG. 13, when the operating lever 27 is slid to the upstream side, only the second tube 10b of the first tube 10a and the second tube 10b is closed, so that the liquid Q It is a first tube 10a flows through the orifice 11a, through the inlet port 32a flows in the flow V ₁ into the chamber 31. At this time, the convex portion 292 and the concave portion 294 are fitted, and the operation lever 2
7 is maintained.

As described above, the flow rate switching means 26 selects the flow pattern of the chemical solution Q to each of the two orifices 11a and 11b, thereby reducing the flow rate of the chemical solution Q to V.
₁ , V ₂ , and V ₃ (these satisfy the relationship of V ₁ <V ₂ <V ₃ ).

The chemical supply devices 1A and 1B as described above do not have an electrically driven mechanism such as a motor or a solenoid, are simple in structure, have few failures, are small in size, light in weight, and low in size. Cost reduction can be achieved.

[0119] Such a drug solution supply device 1A, 1B can be used by a doctor, a nurse, or a patient in a medical institution such as a hospital, but is small and lightweight, and can be used for ordinary drug solution administration and one-time use. The shot injection operation is easy, the safety is high, the sanitary condition is high, and the priming of the drug solution after one-shot injection can be performed quickly. Also suitable for use.

In this case, since the liquid medicine supply devices 1A and 1B are small in size, the liquid medicine supply device can be conveniently carried on a patient's body or in a pocket or the like of a patient.

Further, the drug solution supply device of the present invention is not limited to the case where the drug solution is used to administer a drug solution to a living body (patient). For example, the drug solution is transferred to another container, and particularly, the drug solution is transferred into an infusion bag or blood bag. It can be applied to injection (blending), and the purpose of use is arbitrary.

Although the chemical solution supply device of the present invention has been described based on the illustrated embodiment, the present invention is not limited to this.
The configuration of each part configuring the chemical liquid supply device can be replaced with any configuration that can exhibit the same function.

For example, the discharge amount adjusting mechanism may be of any mechanism and structure as long as the discharge amount of the chemical solution can be adjusted in at least two stages when the chemical solution is discharged by operating the operating means. , Any thing.

Further, as the elastic body defining a part of the chemical solution storage section (chamber 31), a gasket made of the above-mentioned elastic material may be used instead of the diaphragm 7. In this case, the gasket moves (slids) in the cylindrical concave portion defining the chamber 31 to increase or decrease the volume of the chemical solution storage portion, and the movement amount is adjusted by the same discharge amount adjusting mechanism as described above. Thus, the amount of the chemical solution discharged from the outlet can be adjusted in a stepless or multi-step manner.

[0125]

As described above, according to the chemical solution supply device of the present invention, when performing one-shot injection, the amount of one-shot injection of the chemical solution can be adjusted according to the patient's condition and the like.

Further, the structure is simple, and the operation of adjusting the discharge amount by the discharge amount adjusting mechanism and the operation of one-shot injection are also easy. In particular, the discharge amount adjusting mechanism adjusts the distance between the pressing member and the elastic body before the operation of the pressing member, and adjusts the amount of protrusion or movement of the elastic body into the chemical liquid storage unit before the operation of the pressing member. In the case of a mechanism, these effects become more remarkable.

Further, when a flow rate switching means is provided, it is possible to switch the flow rate at the time of injecting a small amount of the drug solution according to the condition of the patient, etc., and to carry out the one-shot injection to the drug solution storage section. It is possible to adjust the time for refilling (priming) the chemical solution, and in particular, to shorten the time. Therefore, the time until the next one-shot injection can be performed is reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view showing an embodiment of a chemical solution supply device of the present invention.

FIG. 2 is a cross-sectional side view showing an embodiment of the chemical solution supply device of the present invention.

FIG. 3 is an exploded view of the chemical solution supply device shown in FIG.

FIG. 4 is a plan view of the chemical solution supply device shown in FIG.

FIG. 5 is a plan view showing a state where an upper cover of the chemical solution supply device shown in FIG. 1 is removed.

FIG. 6 is a plan view showing a state where an upper cover of the chemical solution supply device shown in FIG. 1 is removed.

FIG. 7 is a plan view showing a state where an upper cover of the chemical solution supply device shown in FIG. 1 is removed.

FIG. 8 is a cross-sectional side view showing another embodiment of the chemical solution supply device of the present invention.

FIG. 9 is a cross-sectional side view showing another embodiment of the chemical solution supply device of the present invention.

FIG. 10 is an exploded view of the chemical solution supply device shown in FIG.

FIG. 11 is a sectional side view showing another configuration example of the flow rate switching means in the present invention.

FIG. 12 is a cross-sectional side view showing another configuration example of the flow rate switching means in the present invention.

FIG. 13 is a cross-sectional side view showing another configuration example of the flow rate switching means in the present invention.

[Explanation of symbols]

 1A, 1B Chemical solution supply device 2 Casing 3 First lower case 30 Lower case 31 Chambers 32a, 32b Inlet 33 Outlet 34 Lip 35 Enlarged portion 4 Second lower case 41 Concave portion 42 Support portion 43 Hole 5, 50 Upper case 51 Uplift Part 52 Opening 53 First step 54 Second step 55 Ridge 56, 57 Open 58 Rail 6 Operating means 61 Button housing 611 Groove 612 Spring seat 613 Flange 62 Button 63 Contact surface 64 Groove 65 Spring 66 Male screw 67 Female Screw 7 Diaphragm 71 Rim part 72 Membrane 8 Nipping member 81 Depression 82 Opening 9 Flow rate switching means 91 Operation dial 92 Closure part 93 Gripping part 94a, 94b Receiving member 941 Projection 95 Positioning means 96a, 96b, 96c Recess 97 Pin 98 Spring 99 Stopper 10a First tube 10b Second tube 11a, 11b Orifice 12a, 12b Tip 13 Y-shaped connector 14 Tube 15 Connector 16 One-way valve 17 Tube 18 Scale 19 Chemical storage tank 20 Operating means 21 Button 211 Finger contact part 212 Body 22 First button guide 221 Flange 22a, 22b, 22c Engaging part 23 Second button guide 231 Flange 232 Claw part 24, 25 Spring 26 Flow rate switching means 27 Operating lever 271 Closed part 272 Projection 28a, 28b Receiving member 281, 282 Projecting part 29 Positioning means 291, 292 convex part 293, 294 concave part Q chemical

Claims (9)

[Claims] 1. A chemical solution storage section having a variable volume for storing a chemical solution, an inflow port and an outflow port of a chemical solution communicating with the medical solution storage section, and reducing the volume of the chemical solution storage section to reduce the chemical solution in the chemical solution storage section. Operating means for discharging from the outlet, wherein the operating means includes a discharge amount adjusting mechanism for adjusting the discharge amount of the liquid chemical. 2. A drug solution storage section having a variable volume for storing a drug solution, an elastic body defining a part of the drug solution storage section, an inlet and an outlet for a drug solution communicating with the drug solution storage section, and A pressing member that presses a body to protrude or move to the inside of the chemical solution storage section, and a biasing member that biases the pressing member, wherein the pressing member opposes the biasing force of the biasing member A pressing operation, reducing the volume of the chemical solution storage portion by projecting or moving the elastic body to the inside of the chemical solution storage portion, a chemical solution supply tool for discharging the chemical solution in the chemical solution storage portion from the outlet, A chemical liquid supply tool, comprising: a discharge amount adjusting mechanism that adjusts a state of insertion of the elastic body into the inside of the chemical liquid storage section to adjust a discharge amount of the chemical liquid from the outlet. 3. The chemical liquid supply device according to claim 2, wherein the discharge amount adjustment mechanism comprises a mechanism for adjusting a distance between the pressing member and the elastic body before pressing the pressing member. 4. The chemical liquid supply according to claim 2, wherein the discharge amount adjustment mechanism comprises a mechanism that adjusts a protrusion amount or a movement amount of the elastic body into the chemical liquid storage section before the pressing member is pressed. Utensils. 5. The liquid medicine supply device according to claim 1, wherein the elastic body is a film that can be elastically deformed by the pressing of the pressing member. 6. A one-way valve for restricting the flow direction of a chemical solution in one direction is provided downstream of the outlet.
6. The drug solution supply device according to any one of items 5 to 5. 7. A flow control device for controlling a flow rate of a chemical solution flowing into the chemical solution storage unit to a very small amount.
The chemical solution supply device according to any one of the above. 8. The chemical solution supply device according to claim 7, wherein the flow rate control means includes at least one orifice formed of a very fine flow path. 9. The chemical solution supply device according to claim 1, further comprising a flow rate switching means capable of setting a flow rate of the chemical solution flowing into the chemical solution storage section in at least two stages.