JPH11137681A - Infusion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfusing instrument miniaturizing an instrument and to reduce a manufacturing cost by precisely sending out liquid chemical form a liquid chemical bag and simplifying the structure of the instrument. SOLUTION: A fluid pump 30 is fixed onto the inner surface of a lower case, takes external air in it and feeds to a pressurized bag 22. Along with the increase of the capacity of the bag 22 due to the increase of its inner pressure, a liquid chemical bladder 16 is pressurized to send out the liquid chemical housed inside from a liquid outputting tube 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an infusion device.

[0002]

2. Description of the Related Art Various infusion devices for injecting a drug solution into a patient have been developed and marketed. Among these infusion devices, there has been developed an infusion device of a type in which a medicinal solution is filled into a medicinal bag formed of a flexible bag or the like, and the medicament bag is pressurized to extrude the medicinal solution and supply it to a patient. Such an infusion device is disclosed in JP-B-62-29057 and JP-B-5-29057.
As disclosed in, for example, Japanese Patent No. 3319, a chemical solution is accommodated in a flexible chemical solution bag, and air or other gas is put into a pressurizing bag in contact with the chemical solution bag to pressurize the chemical solution bag. The liquid medicine is pushed out of the bag. Among these infusion devices, there is also disclosed a structure in which the medical solution bag and the pressurized bag are restrained by a band or the like so that the medical solution bag can be more effectively pressurized.

On the other hand, Japanese Patent Application Laid-Open No. Hei 8-508173 discloses that a drug solution bag and a pressure bag are sealed in a pump container, and the pressure of the pressure bag is more reliably applied to the drug solution bag so that the drug solution can be accurately injected. Devices that can be injected into a patient are described.

[0004]

However, in the former technique of the prior art, the chemical solution bag and the pressurized bag are exposed to the outside, so that even if air or the like is put in the pressurized bag, the chemical solution is not filled. There is a problem in that the bag cannot be pressurized with high accuracy, and it is difficult to control the injection speed.

On the other hand, in the latter of the above-mentioned prior arts, the chemical solution bag and the pressure bag are sealed in the pump container, so that the injection of the chemical solution can be accurately controlled by the pressure of the pressure bag. However, there is a problem in that the structure is complicated, for example, a pump for sending air or the like into the pressurized bag is built in a separate chamber in the pump container, the apparatus becomes large, and the manufacturing cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to be able to accurately send out a drug solution from a drug solution bag, to simplify the device structure, to reduce the size of the device, and to manufacture the device. An object of the present invention is to provide an infusion device capable of reducing costs.

[0007]

Means taken by the present invention to solve the above-mentioned problems include a case body having an internal space having a fluid inlet and a chemical solution outlet, and a case body connected to the chemical solution outlet in the internal space. A liquid medicine sac that is accommodated in a sealed state and accommodates a chemical solution; and a fluid supply means that is accommodated in the internal space and connected to the fluid inlet and supplies a fluid to the internal space. Is installed on an inner surface that defines the internal space outside the liquid medicine bag, and the liquid medicine bag is pressurized by the pressure of the fluid supplied by the fluid supply means, and the liquid medicine is discharged from the liquid medicine outlet. Is an infusion device configured as described above.

According to this means, since the liquid medicine bag and the fluid supply means are accommodated in the internal space of the case body, when the fluid supply means supplies the fluid into the internal space from the fluid inlet, the pressure of the fluid causes the chemical liquid to be supplied. The capsule is pressurized and the drug solution is pushed out from the drug solution outlet. Since the fluid supply means is installed on the inner surface that defines the internal space, the structure can be simplified as compared with the case where the fluid supply means is arranged outside, so that the entire structure can be made compact. And the manufacturing cost can be reduced.

Here, the fluid supply means includes two one-way directions sequentially arranged on the fluid inflow path formed along the inner surface from the fluid inlet to a fluid outlet provided in the internal space. It is preferable to include a valve, a flexible partition facing the inflow path between the two one-way valves, and a driving unit for deforming the partition in and out.

According to this means, two one-way valves are sequentially arranged on the inflow path formed along the inner surface, and the flexible partition facing the inflow path between the two one-way valves is driven by the driving means. As a result, the fluid is supplied by being deformed inward and outward, so that the fluid supply means can be reduced in thickness, and can be configured more compactly on the inner surface of the internal space.

In this case, it is preferable that the driving means is a piezoelectric element attached to the partition.

According to this means, since the partition is deformed inward and outward by the piezoelectric element adhered to the partition, the driving means can be reduced in thickness, so that the fluid supply means can be made more compact. .

In each of the above-mentioned means, a chemical liquid cartridge comprising the case body, the chemical liquid sac and the fluid supply means, the chemical liquid cartridge is housed, and is detachably attached to the chemical liquid outlet of the chemical liquid cartridge. It is desirable to have a container including a joint part.

According to this means, since the liquid medicine cartridge including the case body, the liquid medicine sac and the fluid supply means is removably housed in the container, the replacement, cleaning, repair, etc. of the liquid medicine cartridge are facilitated. , Not to mention medical practice,
It is easy to handle at home and on the road.

In this case, it is desirable that the container further includes a drive control circuit for controlling the drive of the fluid supply means.

According to this means, by providing the housing with the drive control circuit for driving and controlling the fluid supply means,
Since the operation setting and the like of the fluid supply means can be held on the container side, even if the chemical liquid cartridge is replaced, it can be used without any trouble.

[0017]

Next, an embodiment according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic longitudinal sectional view showing a structure of a drug solution cartridge of an embodiment of an infusion device according to the present invention. In this embodiment, an upper case 10 and a lower case 2 made of a rigid body such as metal or hard plastic are used.
0 are snap-fitted to each other at the fitting portions 11 and 21 to form a case body. The O-ring 12 is for ensuring airtightness between the fitting portion 11 and the fitting portion 21.

A through-hole is formed in the upper part of the upper case 10, and a liquid outlet tube 14 constituting a chemical solution outlet is inserted into the through-hole. The liquid outlet tube 14 has a cylindrical support member 13 and a ring-shaped outlet. The support member 15 supports and is fixed from inside and outside of the upper case 10 and is sealed. At the inner end of the liquid discharge pipe 14 protruding inside the upper case 10, a liquid medicine bag 16 made of a flexible bag is mounted. This medicine bag 1
As the material 6, synthetic resin such as silicone resin and fluorine resin having various flexibility, chemical resistance, heat resistance, antibacterial property and the like, various synthetic rubbers and the like are used as materials.

On the other hand, inside the lower case 20, a fluid pump 30 constituting a fluid supply means is provided on the bottom surface thereof. The fluid pump 30 includes a suction pipe 31 fixedly inserted into a through hole formed in a side surface of the lower case 20, a pump chamber 32 connected to the suction pipe 31, and a discharge pipe 33 connected to the pump chamber 32. It is composed of Pump room 3
The upper wall 34 is made of a flexible resin sheet, and is welded to the wall surface of the pump chamber 32 so as to straddle both the suction side and the discharge side described later.

On the suction pipe 31 side of the pump chamber 32, a suction-side partition wall 32a in which a plurality of vent holes are annularly arranged.
Is formed on the suction-side partition wall 32a.
5 is attached. These suction side partition walls 32a
The suction side valve body 35 constitutes a one-way valve on the suction side. On the other hand, on the discharge pipe 33 side of the pump chamber 32, a discharge-side partition wall 32b in which a plurality of vent holes are annularly arranged is formed, and a discharge-side valve element 36 is attached to the discharge-side partition wall 32b. . The discharge-side partition wall 32b and the discharge-side valve body 36 constitute a discharge-side one-way valve.

Here, in the following description, the pump chamber 3
2, the suction pipe 31 is closer to the suction space 32A than the suction-side partition 32a, the discharge pipe 33 is closer to the discharge space 32B than the discharge-side partition 32b, and the suction-side partition 32a and the discharge-side partition. The space between the wall 32b is referred to as a driving space 32C.

The lower wall 37 defining the drive space 32C in the pump chamber 32 is made of a flexible resin sheet, and is welded to the lower end of the annular side wall of the pump chamber 32 surrounding the drive space 32C from the periphery. The side wall around the drive space 32C is fixed on the bottom surface of the lower case 20 via the mounting member 38. A disk-shaped piezoelectric element 39 is adhered to the lower wall 37. Electrodes of a predetermined shape are formed on the front and back surfaces of the piezoelectric element 39, respectively.
External terminal 4 exposed on the outer surface of lower case 20 through
0,41.

A pressure bag 22 having flexibility or elasticity is accommodated in the lower case 20, and the pressure bag 22 is connected to a discharge pipe 33 of the fluid pump 30. The pressurizing bag 22 is configured to expand by receiving air supply from the fluid pump 30 and pressurize the liquid medicine sac 16 to push out the liquid medicine. The pressurized bag 22 can be made of the same material as that of the liquid medicine bag 16 described above. In addition, since the pressure bag 22 does not need corrosion resistance to a chemical solution, it can be made of a material having low chemical resistance. The upper case 10 and the lower case 2
If the airtightness of the case body made of zero is high, even if the discharge pipe 33 is opened and air is directly supplied to the internal space of the case body without providing the pressure bag 22, the liquid medicine bag 16 can be pressurized. it can. Also, what is supplied to the internal space of the case body may be a gas other than air, or may be a liquid or powder, as long as it is a fluid having fluidity.

FIG. 2 shows the operation of the fluid pump 30 described above. When the piezoelectric element 39 applies a predetermined alternating voltage (for example, a rectangular wave whose voltage waveform alternates between a positive voltage and a negative voltage) between the external terminals 40 and 41, the fluid pump 30 operates. First, when the voltage applied between the external terminals 40 and 41 is a positive voltage, the piezoelectric element 39 bends downward as shown in FIG. Therefore, the peripheral portion of the suction side valve body 35 is deformed downward, and air flows into the drive space 32C from the suction side space 32A via the suction pipe 31. Next, when the applied voltage between the external terminals 40 and 41 is a negative voltage, as shown in FIG. 2B, the piezoelectric element 39 bends upward, so that the lower wall 37 also has a concave shape. , Since the volume of the driving space 32C is reduced,
The air in 2C deforms the discharge-side valve body 36 upward, flows out into the discharge-side space 32B, and is discharged to the pressurized bag 22 shown in FIG.

The fluid pump 30 takes in outside air into the pressure bag 22 while alternately repeating the state shown in FIG. 2A and the state shown in FIG. As the internal pressure of the pressurizing bag 22 increases and its volume increases, the liquid medicine sac 16 is pressurized, and the liquid medicine contained therein is sent out from the liquid discharge pipe 14.

As shown in FIG. 4, the liquid medicine cartridge 1 is inserted into a housing case 2 which forms a part of a housing of an infusion device, and the liquid outlet pipe 14 is connected to the innermost part of the housing case 2. After being connected to the joint 43 fixed to the housing, the cover case 3 constituting the remaining portion of the housing is connected to the housing case 2 for setting. The connection terminals 53, 5 are provided at locations corresponding to the external terminals 40, 41 on the lid case 3.
4 are provided, and the connection terminals 53 and 54 are connected to a power supply 55
It is conductively connected to a drive control circuit 56 connected to a battery (such as a battery).

The drive control circuit 56 is operated by an operation panel (not shown) provided on the outer surface of the lid case 3, and is configured to send out the chemical at a predetermined injection speed set on the operation panel. ing. That is, the drive control circuit 56 adjusts the frequency of the alternating voltage supplied to the fluid pump 30 via the connection terminals 53 and 54 according to the injection speed set by the operation panel, and controls the pressurizing speed of the fluid pump 30. It is.

A pressure sensor for detecting the internal pressure is arranged in the above-mentioned liquid medicine cartridge 1 on the inner surface of the case body or inside the liquid medicine bag 16 or the pressurizing bag 22, and the detection signal of this pressure sensor is drive-controlled. The internal pressure can be supplied to the circuit 56 to control the internal pressure to a predetermined value, or to control the increase or decrease of the internal pressure.

FIG. 3 is a sectional view showing the joint 43 fixed in the housing case 2. The joint portion 43 is provided with a protruding connecting tubular portion 43a, and an annular lock ring 44 is mounted on the outer periphery of the connecting tubular portion 43a. Inside the lock ring 44, a plurality of lock members 45 arranged in the circumferential direction are provided with coil springs 4.
7 urges the inside of the connection tubular portion 43a. The lock member 45 faces the annular groove 43b having an annular shape formed on the inner surface of the connecting tubular portion 43a and partially provided with a through portion from the outer surface side of the connecting tubular portion 43a, and is housed in the annular groove 43b. 46 is pushed inward. One side surface (upper side surface in the drawing) of the lock member 45 has a tapered shape, and is in contact with an inclined surface formed in the annular groove 43b. When the lock ring 44 is slid upward in the figure, the lock member 45 slides outward while pressing and contracting the coil spring 47 along the inclined surface of the annular groove 43b.

The connecting tubular part 43 in the joint part 43
A closing member 48 is arranged inside the base of a. The closing member 48 has a leading portion 48a protruding into the connecting tubular portion 43a and a flange portion 48 formed around the connecting tubular portion 43a.
c is pressed through an O-ring 51 against the inner surface of the edge portion just before entering the connecting tubular portion 43a. The closing member 48 is a support portion 43c integrally formed inside the joint portion 43.
And a coil spring 49 is housed in a compressed state between the coil spring 49 and the support portion 43c. The closing member 48 is constantly urged by the coil spring 49 toward the connection tubular portion 43a.

When the liquid discharge pipe 14 is inserted into the connection tubular portion 43a, an O-ring 46 protruding by a lock material 45 comes into contact with the outer peripheral surface of the liquid discharge pipe 14 to prevent the liquid discharge pipe 14 from entering. I do. However, when the lock member 45 is retracted to the outside by sliding the lock ring 44 upward in the drawing, the O-ring 46 is drawn into the annular groove 43b, and the liquid discharge pipe 14 extends deep inside the connection tubular portion 43a. Be able to insert. When the liquid discharge pipe 14 is inserted to the depth of the connection tubular portion 43a, the annular groove 14a formed on the outer peripheral surface of the liquid discharge pipe 14 fits into the O-ring 46, and then releases the lock ring 44. Then, the lock ring 44 moves downward again, and the lock material 45 pushes the O-ring 46 into the inside of the connection annular portion 43a, so that the liquid discharge pipe 14 is fitted and fixed by the O-ring 46.

When the liquid discharge pipe 14 is mounted as described above,
The distal end of the liquid discharge pipe 14 pushes the closing member 48 into the joint 43 against the elastic force of the coil spring 49. A liquid passage groove 48b having the same structure as the shape of the head of the screw having a minus shape is formed at the leading end 48a of the closing member 48, and the liquid outlet pipe 14 extends from the liquid passage groove 48b to the inside of the joint 43. The drug solution released from the inflow comes in.

According to the embodiment described above, the liquid medicine sac 1 housed in the internal space of the case body of the liquid medicine cartridge 1
6 is a fluid pump 3 similarly installed on the inner surface of the internal space.
Since the pressure is increased by 0, the chemical liquid cartridge 1 can be configured without providing a fluid pump outside or a separate chamber for disposing the fluid pump, so that the structure is simplified and the size can be reduced. In addition, the manufacturing cost can be reduced.

In the fluid pump 30, two one-way valves are sequentially arranged along the inner surface of the case body, and the lower wall facing the inflow path between these one-way valves is made flexible. Since the configuration is such that the pump is driven, the fluid pump 30 can be reduced in thickness, so that the size can be further reduced.

Further, the chemical liquid cartridge 1 can be easily housed in a container composed of the housing case 2 having the joint portion 43 and the lid case 3 having the drive control circuit 56, so that the chemical liquid cartridge 1 can be easily replaced. , Cleaning and repair, and the drive control circuit 56 for the fluid pump 30 is disposed in the lid case 3 of the container, so that the driving state and control information can be held on the container side. Therefore, even if the chemical liquid cartridge is replaced, it can be easily used without complicated settings.

[0036]

As described above, according to the present invention, since the fluid supply means is installed on the inner surface defining the internal space, the structure is simplified as compared with the case where the fluid supply means is arranged outside. The structure can be made compact as a whole, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing the structure of a drug solution cartridge in an embodiment of an infusion device according to the present invention.

FIGS. 2A and 2B are explanatory diagrams illustrating the operation of a fluid pump installed in the liquid medicine cartridge according to the embodiment. FIGS.
It is.

FIG. 3 is an enlarged sectional view showing a structure of a joint portion to which the liquid medicine cartridge of the embodiment is mounted.

FIG. 4 is an exploded sectional view showing the entire configuration of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chemical liquid cartridge 2 Storage container 3 Lid case 10 Upper case 14 Liquid outlet tube 16 Liquid sac 20 Lower case 22 Pressure bag 30 Fluid pump 37 Lower wall 39 Piezoelectric element

Claims (5)

[Claims] 1. A case body having an internal space having a fluid inlet and a chemical liquid outlet, a chemical liquid sac housed in the internal space connected to the chemical liquid outlet and storing a chemical liquid,
Fluid supply means for supplying fluid to the internal space, the fluid supply means being contained in the internal space in a state connected to the fluid inlet, wherein the fluid supply means defines the internal space outside the liquid capsule. An infusion device installed above and configured to pressurize the liquid medicine sac by the pressure of the fluid supplied by the fluid supply means and discharge the liquid medicine from the liquid medicine outlet. 2. The fluid supply means according to claim 1, wherein the fluid supply means is sequentially arranged on an inflow path of the fluid formed along the inner surface from the fluid inlet to a fluid outlet provided in the internal space. An infusion device comprising: two one-way valves; a flexible partition facing the inflow path between the two one-way valves; and driving means for deforming the partition in and out. 3. The infusion device according to claim 2, wherein the driving means is a piezoelectric element attached to the partition. 4. One of claims 1 to 3
In the above item, a container including the case body, the liquid medicine cartridge including the liquid medicine bag and the fluid supply means, and a joint that houses the liquid medicine cartridge and is configured to be detachably attached to the liquid medicine outlet of the liquid medicine cartridge. An infusion device comprising: 5. The infusion device according to claim 4, wherein the container has a drive control circuit for controlling the drive of the fluid supply unit.