JP3073979B1 - Chemical injection device - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To adopt a method of injecting various kinds of chemicals with one medicine infusion pump. SOLUTION: A chemical liquid discharging means 1 for discharging a chemical liquid and a catheter 1
1 is provided, and the delivery pipeline 4 includes an upstream pipe 41 connected to the chemical solution discharging means 1, a first branch pipe 42 branched at a downstream end of the upstream pipe 41, and The second branch pipe 43 and the first and second branch pipes 42, 4
Downstream pipe 4 formed by merging 3 at the downstream end
4, the upstream pipe 41 is provided with a flow regulator,
An upstream three-way valve 61 is interposed between the downstream end of the upstream pipe 41 and the upstream ends of the first and second branch pipes.
A downstream three-way valve 6 is provided between the branch pipe and the upstream end of the downstream pipe 44.
2 is provided, and the second branch pipe is provided with a one-shot delivery device configured to store the supplied chemical solution and deliver it in a one-shot manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid injector for use in the field of medicine, and more particularly to a liquid injector capable of easily performing an injection operation under various conditions.

[0002]

2. Description of the Related Art Conventionally, there has been known a drug solution injection device as shown in FIG. 7 used for injecting a drug into a patient at a medical site. The drug infusion device 100 includes two drug infusion pumps 101 (a first infusion pump 102 and a second infusion pump 103) and a flexible tube for sending out the medicine discharged from each of the drug infusion pumps 101. A pair of drug channels 104 (the first channel 105 and the second channel 10
6), and a third flow path 107 that is provided at the downstream end of each of the drug flow paths 104 so as to be directed toward the catheter.

The first flow path 105 and the second flow path 1
Reference numeral 06 denotes a flow controller 108 (first flow controller 1).
09 and the second flow controller 110), and especially the first flow controller 1 in the first flow path 105.
A one-shot sending device 111 that sends out the chemical solution in a one-shot manner is provided downstream of 09. The downstream side of the one-shot transmitter 111 and the second flow controller 110
The three-way valve 11 is located between the downstream junction of the
2 are provided so that the flow path can be switched.

Accordingly, by switching the three-way valve 112, the liquid medicine from the second infusion pump 103 is supplied to the patient quantitatively, and the liquid medicine from the first infusion pump 102 is supplied via the one-shot sending device 111. Or one-shot supply of the liquid medicine from the first infusion pump 102 to the patient while supplying the liquid medicine from the second infusion pump 103 quantitatively to the patient. A variety of drug solution injection methods are realized.

[0005]

However, in the above-described drug injection device 100, two drug injection pumps 101 are required in order to make the supply form of the drug solution different, and the cost of parts is correspondingly increased. However, there was a problem that the bulk increased.

The present invention has been made in order to solve such a problem, and has as its object to provide a medicine injecting apparatus which can adopt various kinds of medicinal solution injecting systems with one medicine injecting pump. I have.

[0007]

According to a first aspect of the present invention, there is provided a chemical liquid injector for injecting a medical liquid filled in a storage container into a patient, comprising a chemical liquid discharging means for discharging the chemical liquid. A delivery pipe for delivering the drug solution discharged by the drug solution discharge means toward the catheter, wherein the delivery pipe is an upstream pipe connected to the drug solution discharge means, and a downstream end of the upstream pipe. A first branch pipe and a second branch pipe that are branched, and a downstream pipe formed by merging the first and second branch pipes at a downstream end; a flow rate regulator is provided in the upstream pipe; Branch point of the above upstream pipe
Also, a three-way valve is interposed at least on one side of the junction of the first and second branch pipes, so that the supplied chemical solution can be stored in the second branch pipe and sent out in a one-shot manner. A one-shot transmitter is provided and this one-shot
The feeder is for the upstream chemical solution provided on the side where the chemical solution is discharged.
It is characterized by having a valve that cannot be opened only by pressure .

According to this liquid injector, by closing the three-way valve, the liquid is blocked by the closed cock even when the liquid ejecting means is driven, and is not delivered toward the catheter. In this state, set a predetermined flow rate in the flow controller,
Subsequently, by opening the three-way cock toward the first branch pipe, the chemical liquid is discharged from the chemical liquid discharging means. The discharged chemical solution is adjusted to the set flow rate by the flow rate regulator, then sent out to the catheter through the first branch pipe and the downstream pipe, and injected (continuously infused) into the patient at a constant flow rate. .

Further, by opening the three-way valve toward the second branch pipe, the chemical discharged from the chemical discharge means is flow-regulated by the flow regulator and then sent out through the second branch pipe in one shot. It is supplied to the vessel, and is sent to the catheter as a one-shot by a predetermined operation here, and is injected into the patient's body (one-shot injection).

[0010] As described above, the first and second branch pipes are provided downstream of the flow regulator to form two flow paths, and at least one of the upstream end and the downstream end of these two flow paths. By providing a three-way valve so that the flow path can be switched, different states of the chemical solution (continuous injection and one-shot injection) by one chemical solution discharge means
Injection into the patient at the same time can be performed, and the conventional inconvenience of requiring two chemical liquid ejection means to realize injections in different states is eliminated. Reduction of parts cost is realized.

According to a second aspect of the present invention, there is provided a liquid injector.
2. The liquid injector according to claim 1, wherein the flow rate adjuster includes a spiral flow path including a spiral groove formed on a peripheral surface of the flow path forming member.

According to this liquid injector, the flow path length can be increased while the size of the flow regulator is reduced, so that a minute flow rate of the drug can be obtained in a stable state. By lengthening the lockout time described later, it becomes possible to restrict the frequent operation of one-shot injection by the patient himself.

According to a third aspect of the present invention, there is provided a drug injection device,
3. The drug injection device according to claim 2, wherein the spiral channel has a variable channel length.

According to this liquid injector, the pressure loss of the medicine introduced into the spiral flow path changes by changing the flow path length. And since the pressure loss is proportional to the flow path length, the flow rate of the drug solution will be inversely proportional to the flow path length of the spiral flow path.If a spiral path having a long flow path length is selected, the flow rate decreases, The flow rate is increased by changing the spiral flow path to a shorter flow path length.

By adopting such a method of adjusting the flow rate by the length of the flow path, the set flow rate is stabilized as compared with a method of adjusting the flow rate by changing the opening area of the orifice, for example, and the set flow rate is adjusted to the set value. The constant supply of the chemical is ensured.
In addition, by employing a spiral flow path, a long flow path can be formed in a small casing even in a small casing, thereby realizing the miniaturization of the flow path regulator.

According to a fourth aspect of the present invention, there is provided a drug injection device,
3. The medicine injection device according to claim 1, wherein the one-shot delivery device is increased by introducing a chemical solution through a chemical solution container whose internal volume increases and decreases through the upstream second branch pipe into the chemical solution container. One-shot generating means for reducing the inner volume of the chemical solution container to send out the chemical solution in the chemical solution container toward the second branch pipe on the downstream side is provided.

According to this liquid injector, the liquid medicine from the liquid discharging means is sent to the liquid container in a reduced volume state, so that the liquid container increases in volume as the inside is filled with the liquid medicine. Then, after the inside of the chemical solution container is filled with a predetermined amount of the chemical solution, the one-shot generating means is operated to reduce the volume of the chemical solution container, so that the chemical solution in the container is drawn out toward the second branch pipe on the downstream side. . By repeating this operation, the drug solution is injected into the patient's body via the catheter as a one-shot. In a single operation of the one-shot generating means, a so-called one-shot administration in which a small amount of a drug solution is administered to a patient is performed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing one embodiment of a chemical liquid injector according to the present invention. As shown in this figure,
The chemical liquid injection device 10 is formed of a transparent synthetic resin material and is configured to discharge a chemical liquid, a chemical liquid discharge unit 1, and a discharge pipe 4 that transmits the chemical liquid discharged from the chemical liquid discharge unit 1 to the catheter 11. A flow regulator 5 for regulating the flow rate of the chemical solution, a pair of three-way valves 6 for switching the flow path provided downstream of the flow regulator 5, And a one-shot transmitter 7 provided in one of the flow paths branched by the three-way valve 6 on the side.

The delivery pipe 4 is connected to an upstream pipe 41 made of a synthetic resin tube connected to the front end (the right side in FIG. 1) of the chemical solution discharging means 1 and branches off at a downstream end of the upstream pipe 41. A first branch pipe 42 and a second branch pipe 43 formed by
A downstream pipe 44 is connected to a junction of the downstream ends of the first and second branch pipes 42 and 43. The flow controller 5 is provided in the upstream pipe 41, and the one-shot feeder 7 is provided in the second branch pipe 43.

The three-way valve 6 includes an upstream three-way valve 61 interposed between the upstream pipe 41 and a downstream branch point of the upstream pipe 41.
Downstream ends of the first and second branch pipes 42 and 43 and the downstream pipe 44
And a downstream three-way valve 62 interposed therebetween. By switching the upstream three-way valve 61, the upstream pipe 41 can be communicated with the first branch pipe 42 or the second branch pipe 43, and the downstream three-way valve 62 can be switched. This allows the first branch pipe 42 to communicate with the downstream pipe 44 or the second branch pipe 43
Can be communicated with the downstream pipe 44.

Therefore, by operating the upstream three-way valve 61 to connect the upstream pipe 41 to the first branch pipe 42 and operating the downstream three-way valve 62 to connect the first branch pipe 42 to the downstream pipe 44, The drug solution discharged from the drug solution discharging means 1 is supplied to the catheter 11 through the upstream pipe 41, the flow controller 5, the first branch pipe 42, and the downstream pipe 44,
By operating the upstream three-way valve 61, the upstream pipe 41 is connected to the second branch pipe 43.
And by operating the downstream three-way valve 62
By connecting the branch pipe 43 to the downstream pipe 44, the chemical discharged from the chemical discharge means 1 passes through the upstream pipe 41, the flow regulator 5, the second branch 43, the one-shot delivery device 7, and the downstream pipe 44. Is supplied to the catheter 11.

That is, when the first branch pipe 42 is selected, the chemical solution bypasses the one-shot delivery device 7 and the catheter 1
1 while being injected into the patient's body while the second branch 4
By selecting 3, the chemical solution can be supplied to the one shot transmitter 7.
Is supplied once, and is ejected in a one-shot manner by a predetermined operation to be supplied to the body of the patient.

Hereinafter, the liquid injector 1 will be described with reference to FIGS.
Each component constituting 0 will be described.

FIG. 2 is an explanatory side sectional view showing one embodiment of the chemical solution discharging means 1. As shown in FIG. As shown in this figure, the chemical liquid discharging means 1 includes a chemical liquid storage container 2 for storing a liquid chemical for injection, and a rear portion of the chemical liquid storage container 2 (left side in FIG. 1).
And a pump section (pressing force applying means) 3 connected to the pump section 3. The pump section 3 drives the chemical solution in the chemical solution storage container 2 to be sent out toward the upstream pipe 41. The chemical storage container 2 includes a cylindrical storage container main body 21, a first piston 22 whose outer peripheral surface moves back and forth while slidingly contacting the inner peripheral surface within the storage container main body 21, and a distal end surface of the storage container main body 21. And a connecting cylinder 23 protruding concentrically with the storage container body 21.

The connection tube 23 has a detachable cap 2
8 is fitted outside in close contact. This cap 28
It is removed when filling the chemical storage container 2 with the chemical.
A discharge pipe 26 protrudes from the base end surface of the storage container main body 21, and the liquid medicine filled in the liquid medicine storage container 2 is discharged by the rightward movement of the first piston 22 driven by the pump unit 3. The air is drawn out toward a predetermined upstream pipe 41 through the air pipe 26.

A mounting portion 25 having an outer diameter slightly larger than that of the storage container body 21 is integrally formed on the base end side of the storage container body 21, and a distal end portion of the pump section 3 is fitted inside the mounting portion 25. The pump unit 3 is fixed to the drug solution storage container 2 by being locked by a predetermined locking structure.

The pump section 3 has a cylindrical pump body 3.
1 and a second piston 32 housed in the pump body 31 so as to be able to move back and forth in sliding contact therewith.
The second piston 32 and the first piston 22 are connected to each other by a piston rod 27. Also,
An end wall 33 is provided at the distal end opening of the pump body 31, and the piston rod 27 penetrates the end wall 33 in a sliding state. A decompression chamber 34 is formed in the pump body 31 between the end wall 33 and the second piston 32.

Therefore, when a chemical is injected into the chemical storage container 2 through the connecting cylinder 23 with the upstream three-way valve 61 closed using a predetermined injection jig, the injection pressure causes the first piston 22 to move. It moves to the left to fill the drug solution storage container 2 with the drug solution, and the piston rod 27
, The second piston 32 also moves to the left, whereby the degree of vacuum in the decompression chamber 34 of the pump unit 3 is sequentially increased.
The chemical liquid once injected into the chemical liquid storage container 2 does not flow backward from the connection cylinder 23 by a chemical liquid check structure (not shown) provided in the connection cylinder 23.

When the upstream three-way valve 61 is opened in this state, the degree of vacuum in the decompression chamber 34 is increased, so that the second piston 32 moves rightward in the pump body 31 and the first piston 32 By moving the liquid medicine 22 to the right, the liquid medicine in the liquid medicine storage container 2 is drawn out through the discharge pipe 26, and after the flow rate is adjusted by the flow rate regulator 5, the catheter 1 is moved.
1 will be injected into the patient's body.

FIG. 3 is an explanatory view of a cross-sectional side view showing one embodiment of the flow regulator 5, and FIG. 4 is a side view showing one embodiment of a flow path forming member provided in the flow regulator 5. It is. In the present embodiment, the flow regulator 5 is mainly formed of a synthetic resin material. As shown in FIG.
The flow regulator 5 includes a box-shaped casing 51, a switching cock 52 provided in the casing 51, a pair of holding cylinders 53 whose upstream ends are connected to the switching cock 52 in the casing 51, The casing 53 includes two column-shaped flow path forming members 54 mounted inside the casing 53, and a joint member 55 connected to the downstream end of the holding cylinder 53 in the casing 51.

The switching cock 52 has a valve support member 52a having a valve body 52b formed of a three-way valve therein. The upstream end of the valve support member 52a is connected to the downstream end of the upstream pipe 41 (FIG. 1). Connected and the downstream end is the valve body 5
It is bifurcated via 2b and connected to the upstream ends of a pair of holding cylinders 53, respectively. The valve body 52b has a columnar shape, and is rotatably supported on the inner wall in the valve support member 52a so as to be rotatable around the axis.

The valve body 52b has a through flow passage penetrating radially through the center and a semi-through flow passage extending radially from the center of the through flow passage.
By rotating (FIG. 1), the connection state between the upstream pipe 41 and each holding cylinder 53 can be changed. Specifically, by operating the switching knob 56, the upstream pipe 41 and one of the holding cylinders 53 can be connected, or both can be connected, and the connection state with both can be cut off. Has also become. As a result, the chemical introduced from the upstream pipe 41 into the flow controller 5 can be arbitrarily changed by the switching operation of the switching knob 56 to one of the holding cylinders 53.
, Through the other holding cylinder 53, or through both holding cylinders 53, and further, do not flow into the holding cylinder 53.

The joint member 55 includes a casing 5
1 and a connecting pipe which joins from the forked joint and protrudes outside the casing 51 from the forked joint. The fork joint has a pair of holding cylinders 53 on the upstream side.
And the connection pipe is connected to the upstream three-way valve 61 (FIG. 1). Therefore,
The chemical introduced into the flow regulator 5 through the upstream pipe 41 is
The fluid is sent out to the upstream three-way valve 61 through the joint member 55 via the flow path forming member 54 in the holding cylinder 53.

As shown in FIG. 4, the flow path forming member 54 has a spiral groove 54a formed in the outer peripheral surface of a cylindrical body, and a spiral flow path 54b through which a chemical solution flows is formed by the spiral groove 54a. The outer diameter of the flow path forming member 54 is set slightly smaller than the inner diameter of the holding cylinder 53, and the chemical introduced into the flow rate controller 5 by being inserted into the holding cylinder 53 allows the spiral flow path 54 b It flows down through.

The helical length of the flow path forming member 54 inserted into one of the holding cylinders 53 is set to a predetermined multiple of the helical length of the one inserted into the other holding cylinder 53. The pressure loss of one flow path forming member 54 is larger than the pressure loss of the other. Therefore, when one of the flow path forming members 54 is selected by the switching operation of the switching knob 56, the chemical solution has a smaller flow rate than when the other one is selected, while when both are selected, the total flow rate is obtained. It is supposed to be.

By adopting such a flow path forming member 54, it is possible to form a long spiral flow path 54b for adjusting the flow rate on the surface of the flow path forming member 54. The size can be reduced, and more stable flow rate adjustment can be realized as compared with a method in which the flow rate is adjusted by changing the flow path diameter.

FIGS. 5A and 5B are explanatory views in a side sectional view showing one embodiment of the one-shot sending device 7, wherein FIG. 5A shows a state in which the operating rod is raised, and FIG. 5B shows a state in which the operating rod is lowered. Is shown. This one-shot transmitter 7
It is formed entirely of a synthetic resin material. As shown in FIG. 5, the one-shot transmitter 7 is fitted into a tubular transmitter main body 71 whose outer peripheral surface is slightly constricted, and is slidably inserted into the cylinder of the transmitter main body 71 from an upper opening. Operating rod 72, a cylindrical bag-shaped reservoir 73 made of a flexible material attached to a lower end of the operating rod 72, and a lower portion of the reservoir 73 and internally fitted to a lower end of the transmitter main body 71. The valve support 74 is provided.

As shown in FIG. 5A, the operation rod 72 has an upper position in which the head projects upward from the upper portion of the transmitter main body 71, and as shown in FIG. The head can be raised and lowered between a lower position where the head is lowered to near the upper edge of the transmitter body 71. When the operation rod 72 is located at the upper position, its head is pressed downward, and the operation rod 72 is lowered to be introduced into the one-shot sending device 7 through the upstream side of the second branch pipe 43. The discharged chemical liquid is led out one shot toward the downstream side of the second branch pipe 43.

The reservoir 73 is made of a tough synthetic resin sheet having a tubular shape, and is integrally fixed with its upper edge fitted to the lower edge of the operating rod 72 without any gap. In addition, the lower edge portion is integrally fixed to the upper edge portion of the valve support member 74 in a state where the lower edge portion is fitted to the upper edge portion without a gap, thereby forming a storage chamber 73a for storing a chemical solution in the reservoir 73. Has become. When the operation rod 72 is at the upper position, as shown in FIG. 5A, the outer peripheral surface of the reservoir 73 contacts the inner peripheral surface of the transmitter main body 71, and the storage chamber 73a reaches the maximum capacity. On the other hand, when the operation rod 72 is pressed and located at the lower position, as shown in FIG.
The upper portion of the reservoir 3 is folded so as to enter the lower portion of the reservoir 73 so that the storage chamber 73a has a minimum capacity.

The valve support 74 has an inlet connecting pipe 74a connected to the downstream end of the upstream second branch pipe 43 and an outlet connecting pipe 74 connected to the upstream end of the downstream second branch pipe 43.
b. Further, the opening between the outlet connection pipe 74b and the storage chamber 73a of the reservoir 73 is not opened by the pressure of the chemical solution generated by the driving of the pump unit 3, but the operating rod 72 at the upper position is pressed with a larger pressing force. A one-way valve 75 is provided, which is opened.

Accordingly, the chemical discharged from the chemical discharge means 1 in the state shown in FIG. 5B is introduced into the storage chamber 73a of the reservoir 73 through the inlet connection pipe 74a, and the operating rod 72 is pressed by the pressure. As a result, the storage chamber 73a of the reservoir 73 having the maximum capacity is filled with the chemical solution. The one-way valve 75 is connected to the reservoir 7
3 is designed not to be opened only by the pressure on the upstream side, so that the chemical in the storage chamber 73a passes through the outlet connection pipe 74b to the second branch pipe 43 on the downstream side unless the operation rod 72 is pressed. It is not derived.

Hereinafter, the operation of the present invention will be described with reference to FIGS. 1 to 5 as needed based on FIG. FIG. 6 is a graph showing an embodiment of the change over time of the drug solution dose, with the horizontal axis indicating time and the vertical axis indicating the drug solution flow rate. As shown in FIG. 6, in a continuous infusion time period T1 in which a predetermined time is set, a predetermined amount of a drug solution is infused into a patient in three stages.

First, the first continuous infusion time zone T11 (time t
_{From 0 to} t ₁ ), the medicine at the maximum steady flow rate Q3 during continuous infusion is supplied to the patient. When administering the liquid medicine having the maximum steady flow rate Q3, first, the switching knob 56 (FIG. 1) of the switching cock 52 of the flow rate regulator 5 is operated to move the upstream pipe 41 to the pair of flow path forming members 54 (FIG. 3). The flow path is set so as to communicate, and the upstream three-way valve 61 and the downstream three-way valve 62 are subsequently operated so that the upstream pipe 41, the first branch pipe 42, and the downstream pipe 44 communicate with each other. Then, the decompression chamber 3 of the pump section 3
The second piston 32 (FIG. 2) due to the high degree of vacuum in FIG.
To the right causes the first piston 22 to move to the right,
The chemical liquid filled in the storage container body 21 is discharged from the discharge pipe 26.
And is supplied to the flow regulator 5 via the upstream pipe 41, is distributed to the valve main body 52b by the flow regulator 5, and is supplied to the pair of flow path forming members 54.
b (FIG. 4) from the joint member 55,
It is injected into the patient from the catheter 11 through the upstream three-way valve 61, the first branch pipe 42 and the downstream pipe 44.

[0044] Then, the second infusion time period T12 is the time t ₁ is started, the agent of the intermediate steady flow Q2 is administered. Therefore, when the time t ₁ is reached, the switching of the valve body 52b by the operation of the switching knob 56 causes the flow path forming member 54 having the smaller pressure loss to be formed in the flow regulator 5.
The flow path is set so that the chemical solution passes through. As a result, the liquid medicine having the intermediate steady flow rate Q2 is ejected from the flow regulator 5, so that the medicine having the intermediate steady flow rate Q2 is injected into the patient during the second continuous infusion period T12.

Next, when the third continuous injection period T13 is started at time t ₂ , the operation of the switching cock 52 allows the chemical liquid to flow to the flow path forming member 54 having the larger pressure loss. And the minimum steady flow Q
1 drug is administered to the patient, the upstream side three-way valve at time t ₃ 6
1 is closed to complete the continuous infusion of the drug.

Normally, one round of drug infusion is completed at the time when the administration of the drug in the third continuous infusion time zone T13 is completed (time t ₃ ), but the drug infusion ends and a medical staff (doctor or nurse) In a one-shot time period T2 after the person has left), the patient may wish to administer the medicine in a one-shot manner. In such a case, the patient himself operates the one-shot transmitter 7 to inject the medicine in a one-shot manner.

When the medicine is injected in a one-shot manner, first, the upstream three-way valve 61 and the downstream three-way valve 62 are operated so that the flow path of the chemical solution passing through the first branch pipe 42 is changed to the second branch pipe 43. Is switched to the flow path passing through. In this way, the chemical from the chemical discharge means 1 passes through the second branch pipe 43 and is supplied to the reservoir 73 of the one-shot transmitter 7.
Is supplied into the storage chamber 73a, and the operation rod 72 is lifted to fill the storage chamber 73a ((A) in FIG. 5).

In this state, the transmitter main body 71 is gripped with the palm of the hand, and the operation rod 72 is pressed with the thumb, whereby
As shown in (b), the volume in the storage chamber 73a is reduced, whereby the chemical solution in the storage chamber 73a is discharged to the second branch pipe 43 on the downstream side through the one-way valve 75 and the outlet connection pipe 74b. Through the downstream pipe 44 and the catheter 11, a chemical solution having a one-shot flow rate Q4, which is a flow rate larger than the maximum steady flow rate Q3, is injected into the patient in a very short time.

By repeating this operation a plurality of times, the drug solution is administered to the patient in a one-shot manner as shown in the one-shot time zone T2 in FIG. In addition, by operating the three-way valve 6, the chemical liquid flow path is changed to the first branch pipe 42.
The lock-out time from when the one-shot administration is completed after switching from the first branch pipe 43 to the second branch pipe 43 and before the one-shot administration is completed after the one-shot administration is performed is determined by the flow rate. It can be changed as appropriate by adjusting the flow rate of the chemical toward the second branch 43 by the adjuster 5.

According to the present invention, as described in detail above, two pipes are provided so that the flow path of the chemical discharged from the chemical storage container 2 can be switched, and one of the pipes (the first branch pipe 42) is connected to the bypass pipe. In addition, since the one-shot delivery device 7 is provided in the other pipe line (the second branch pipe 43), the drug solution discharged from the drug solution discharging means 1 through the first branch pipe 42 is supplied to the patient at the time of normal steady injection of the drug solution. In addition to being able to inject directly into the body of
The one-shot administration can be performed by the one-shot delivery device 7 by switching the pipe line to the second branch pipe 43, and the drug solution injector 10 can be made versatile.

The upstream pipe 41 is connected to the first branch pipe 42 and the second branch pipe 4 at the downstream end thereof via an upstream three-way valve 61.
3 and are joined by a downstream three-way valve 62 at these downstream ends and connected to the downstream pipe 44, so that one chemical liquid discharging means 1 can perform both regular injection and one-shot injection. And the cost of parts can be reduced accordingly.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above embodiment, the spiral groove 54a is formed on the outer peripheral surface of the flow path forming member 54, and the chemical solution flows down the spiral groove 54a. A helical groove may be provided on the inner peripheral surface of 53.

(2) In the above embodiment, a check valve may be provided in the inlet connection pipe 74a. By doing so, when the operation rod 72 at the upper position is pressed, the chemical in the storage chamber 73a does not flow backward toward the second branch pipe 43 on the upstream side due to the action of the check valve.
The liquid is efficiently discharged toward the second branch pipe 43 on the downstream side.

[0055]

(4) In the above embodiment, the example shown in FIG. 6 is described as an administration pattern of a drug solution to a patient. However, the present invention is not limited to adopting such an administration pattern. It is also possible to adopt various administration patterns such as increasing the injection amount in a stepwise manner or interposing one-shot injection between fixed-quantity injections.

(5) In the above embodiment, the upstream three-way valve 61 and the downstream three-way valve 62 are provided at the upstream end and the downstream end of the first branch pipe 42 and the second branch pipe 43, respectively. Three-way valve 6
May be provided.

(6) In the above embodiment, the two flow path forming members 54 in which the spiral grooves 54a are screwed are adopted as the means for adjusting the flow rate. A plurality of pipes having different sizes may be adopted, and the flow rate may be adjusted by selecting which pipe the chemical solution flows by operating the switching cock.

(7) In the above embodiment, a plurality (two in this embodiment) of the flow path forming members 54 are mounted in the flow rate regulator 5. 5
4 is not limited to a plurality, but may be one. Then, in order to make the flow rate variable with one flow path forming member, while supplying the chemical liquid from the upstream end to the flow path forming member, a plurality of discharge positions are provided along the longitudinal direction of the flow path forming member, Alternatively, the discharge position may be configured to be movable. Further, the effective length may be changed by displacing the flow path forming member with respect to the inlet and the outlet of the chemical solution. With these, the distance from the supply position to the discharge position of the chemical solution in the flow rate forming member can be appropriately selected, and the flow rate can be easily changed by this selection.

(8) In the above embodiment,
Although the variable flow rate regulator 5 is adopted, the present invention
The flow rate regulator is not limited to the variable flow rate type.For example, by using a single fixed spiral flow path, the flow rate is adjusted so that only a predetermined flow rate of the liquid medicine is obtained in advance. It may be possible to adopt what has been done.

[0061]

According to the liquid injector according to the first aspect of the present invention, the delivery pipe for flowing down the liquid chemical discharged by the liquid discharge means is connected to the upstream pipe connected to the liquid discharge means,
A first branch pipe and a second branch pipe branched at the downstream end of the upstream pipe, and a downstream pipe formed by merging the first and second branch pipes at the downstream end, and the upstream pipe is provided with a flow rate. the regulator is provided, interposed a three-way valve on at least one side of the confluence of the branch point of the upstream pipe and the first and second branch pipes, one-shot manner by storing the supplied chemical to the second branch pipe A one-shot transmitter that is configured to be able to deliver the drug solution to the discharge side of the chemical solution.
Valve that cannot be opened only by the pressure of the chemical solution on the upstream side
Since the provided chemical liquid by closing the three-way valve can be in a state that does not sent toward the catheter is also blocked in the closed been cock by the drive of the solution discharge means. In this state, a predetermined flow rate is set in the flow rate regulator, and then the three-way cock is opened toward the first branch pipe, whereby the chemical liquid can be discharged from the chemical liquid discharge means.
The discharged liquid medicine is adjusted to the set flow rate by the flow rate regulator and then sent out to the catheter through the first branch pipe and the downstream pipe, and is injected (continuously injected) into the patient at a constant flow rate. Can be.

Further, by opening the three-way valve toward the second branch pipe, the flow rate of the chemical discharged from the chemical discharge means is adjusted by the flow controller, and then the one-shot is transmitted through the second branch pipe. A so-called one-shot injection can be performed in which the liquid is supplied to the vessel, and is sent to the catheter as one shot by a predetermined operation.

As described above, the first and second branch pipes are piped downstream of the flow regulator to form two flow paths, and at least one of the upstream end and the downstream end of these two flow paths. By providing a three-way valve so that the flow path can be switched, it becomes possible to perform infusion into the patient by continuous infusion or one-shot infusion by one chemical solution discharge means, and to perform infusion in different states. The conventional inconvenience that two chemical liquid discharging means are required for injection is solved, and the cost of parts of the chemical liquid injection device can be reduced accordingly.

According to the liquid injector according to the second aspect of the present invention, since the flow rate regulator is provided with the spiral flow path composed of the spiral groove on the peripheral surface of the flow path forming member, the flow rate regulator can be used. In addition to achieving a compact size, the flow path length can be lengthened, which allows a very small flow rate of the drug to be obtained in a stable state, and the lockout time is lengthened, resulting in a one-shot injection by the patient himself. Frequent operations can be regulated.

According to the liquid injector according to the third aspect of the present invention, since the length of the spiral flow path is made variable, the pressure loss of the drug introduced into the spiral flow path by changing the flow path length is changed. Can be changed. And since the pressure loss is proportional to the flow path length, the flow rate of the drug solution will be inversely proportional to the flow path length of the spiral flow path.If a spiral path having a long flow path length is selected, the flow rate decreases, The flow rate can be increased by changing to a spiral flow path having a short flow path length.

By adopting such a method of adjusting the flow rate by the length of the flow path, the set flow rate is more stable than that of adjusting the flow rate by changing the opening area of the orifice, for example. It is possible to reliably supply a fixed amount of the chemical solution. In addition, by employing a spiral flow path, a long flow path can be formed in a small casing even in a small casing, whereby the flow path regulator can be downsized.

According to the drug injection device of the fourth aspect of the present invention, the one-shot delivery device is provided with a chemical solution container whose internal volume increases and decreases and a chemical solution is introduced into the chemical solution container through the second branch pipe on the upstream side. And a one-shot generating means for sending the chemical solution in the chemical solution container toward the second branch pipe on the downstream side by reducing the internal volume of the chemical solution container increased by the By sending the liquid into the reduced volume chemical solution container, the volume of the chemical solution container increases as the inside is filled with the chemical solution, and after the inside of the chemical solution container is filled with the predetermined amount of the chemical solution, the one-shot generating means is operated to reduce the chemical solution container. This allows the chemical solution in the container to be drawn out toward the downstream second branch pipe. By repeating such an operation, the drug solution can be injected into the patient's body via the catheter as a one-shot.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a chemical solution injection device according to the present invention.

FIG. 2 is an explanatory diagram of a side cross-sectional view showing one embodiment of a chemical solution discharging unit.

FIG. 3 is an explanatory view in a side sectional view showing an embodiment of a flow regulator.

FIG. 4 is a side view showing an embodiment of a flow path forming member provided in the flow regulator.

FIGS. 5A and 5B are explanatory views in a side sectional view showing one embodiment of the one-shot sending device, wherein FIG. 5A shows a state where the operation rod is raised, and FIG. 5B shows a state where the operation rod is lowered.

FIG. 6 is a graph showing one embodiment of a temporal change of a drug solution dose.

FIGS. 7A and 7B are cross-sectional views illustrating a conventional liquid injector.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 chemical liquid injection device 1 chemical liquid discharge means 11 catheter 2 chemical liquid storage container 21 storage container main body 22 first piston 23 connection cylinder 25 mounting section 26 discharge pipe 27 piston rod 28 cap 3 pump section 31 pump main body 32 second piston 33 end wall 34 Decompression chamber 4 Delivery pipe 41 Upstream pipe 42 First branch pipe 43 Second branch pipe 44 Downstream pipe 5 Flow rate regulator 51 Casing 52 Switching cock (channel length changing means) 52a Valve support member 52b Valve body 53 Holding cylinder 54 Flow Road forming member 54a Spiral groove 54b Spiral flow path 55 Joint member 6 Three-way valve 61 Upstream three-way valve 62 Downstream three-way valve 7 One-shot transmitter 71 Transmitter main body 72 Operating rod 73 Reservoir 73a Storage chamber 74 Valve support 74a Inlet connection Pipe 74b Outlet connection pipe 75 One-way valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61M 5/14 345 A61M 5/145 A61M 5/168 A61M 39/00

Claims (4)

(57) [Claims] 1. A chemical liquid injection device for injecting a medical liquid filled in a storage container into a patient, wherein the medical liquid discharge means discharges the chemical liquid, and the chemical liquid discharged by the chemical liquid discharge means is delivered to a catheter. A delivery pipeline, wherein the delivery pipeline is connected to an upstream pipe connected to the chemical solution discharging means,
A first branch pipe and a second branch pipe branched at the downstream end of the upstream pipe, and a downstream pipe formed by merging the first and second branch pipes at the downstream end. A flow regulator is provided, and the branch point of the upstream pipe is aligned.
A three-way valve is interposed on at least one side of the junction of the first and second branch pipes , and the second branch pipe is configured to store the supplied chemical solution and deliver it in a one-shot manner. shot dispenser is provided, feeding one-shot
Dispenser is the pressure of the upstream chemical solution provided on the discharge side of the chemical solution.
A chemical liquid injector having a valve that cannot be opened only by itself. 2. The medicine injection according to claim 1, wherein the flow rate regulator includes a spiral flow path formed of a spiral groove formed on a peripheral surface of the flow path forming member. apparatus. 3. The drug injection device according to claim 2, wherein the spiral flow path is configured to change a flow rate of the drug by changing a flow path length. 4. The one-shot delivery device reduces a chemical solution container whose internal volume increases and decreases and a chemical solution container which is increased by introducing a chemical solution through an upstream second branch pipe into the chemical solution container. 3. The drug injection device according to claim 1, further comprising a one-shot generating unit that sends out the drug solution in the drug solution container toward the second branch pipe on the downstream side.