JP2002239002A - Portable drip infusion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic control type portable drip infusion device by which a practically fixed infusion rate is safely and surely obtained, a stable shape is maintained even when the residual amount of an infusion changes and the infusion does not remain when drip infusion is completed. SOLUTION: By providing an air pump for automatically supplying pressurizing air on a pressurizing bag means holding an infusion bag and controlling the supply amount of the pressurizing air and/or the dripping speed by an air pressure inside the pressurizing bag and/or the infusion dripping speed, the practically fixed infusion amount is automatically, safely and surely dropped. Also, by fixing a hard planar member to one inner side face of the pressurizing bag and arranging an infusion discharge port at the lower end part of the infusion bag near the lower end of the hard planar member, the shape of the pressurizing bag at the time of expansion and contraction is stabilized and the infusion bag is uniformly pressurized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable infusion apparatus capable of detachably holding an infusion bag from a hanger when leaving a bed, and more particularly to a pressurized bag type which can be worn comfortably even during infusion. The present invention relates to a portable infusion device.

[0002]

2. Description of the Related Art A conventional infusion bag is hung on a hanger, and an intravenous drip is infused into a patient by gravity. When the patient leaves the bed, the infusion bag must be moved while hung on the hanger. This limits the degree of freedom of the body and is often one of the causes of suffering from illness.

[0003] Under such circumstances, as a drip device that can be freely carried by a patient, a pressurized bag having both ends of a net fixed thereto, and a manual air supply for supplying pressurized air to the pressurized bag. A portable having a pump, in which an infusion bag is inserted between a pressure bag and a sheet member, and then the infusion bag is pressed to inflate the infusion bag to drop the infusion. Infusion devices have been proposed and are commercially available.

However, since the pressurized bag is formed of a flexible material so as to be inflatable, when the pressurized air is injected, it is inflated not only in the front but also in the rear (patient side), and the amount of infusion is particularly large. In such a case, there is a problem that the wearing feeling is poor.

[0005] It is therefore an object of the present invention to provide a portable infusion device that can provide a good wearing feeling even when the pressure bag is inflated for infusion.

[0006]

Means for Solving the Problems In view of the above problems, as a result of intensive studies, the present inventors have found that a hard plastic or the like which does not substantially deform even when the pressure bag is inflated is placed on the back side of the pressure bag holding the infusion bag. By providing a plate consisting of
It has been found that a good wearing feeling can be maintained in any inflated state of the pressurized bag, and the present invention has been completed.

That is, the portable infusion apparatus of the present invention comprises a pressurizing bag means for accommodating an infusion bag and pressurizing the infusion bag to allow the infusion to flow out, and supplying pressurizing air to the pressurization bag means. A pressurizing bag means, wherein the pressurizing bag means comprises a pressurizing bag in which only the front side inflates without substantially deforming the back side even when the pressurizing air is supplied; and A sheet member fixed to both end portions on the front side and capable of holding the infusion bag between the pressure bag and the pressure bag.

[0008] In order to ensure that only the front side is inflated without substantially deforming the back side even when inflated by the introduction of pressurized air, the back side of the pressurized bag is so large that it is not deformed by the inflation of the pressurized bag. It is preferable to provide a plate made of hard plastic or the like having strength. Further, by providing a flexible material on the back side of the plate material, the feeling of wearing can be further improved.

In a preferred embodiment of the present invention, the sheet member is folded back and forth so that the folded portion is substantially at the center and the folded portion is on the lower side. It is fixed to both ends of the pressure bag,
The rear portion of the sheet member is fixed to the pressurized bag, and the folded portion is provided with an opening for exposing a plug for infusion discharge of the infusion bag, whereby the infusion bag is provided with the seat. It is supported by a member and held between the pressure bag and the sheet member. Preferably, the sheet member is made of a net.

The air supply means may be a manual pump or a pump driven by a motor.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [1] Structure of Portable Infusion Device FIG. 1 shows the overall configuration of a portable infusion device according to a preferred embodiment of the present invention, FIG. 2 shows a cross-sectional structure of a pressure bag means, and FIG. 1 shows a preferred example of a portable infusion device.

An infusion tube 5 is connected to a stopper 3a at the lower end of the infusion bag 3.
The infusion tube 5 is provided with a drip tube 6 and an infusion needle 10. The pressure bag means 1 for holding the infusion bag 3 includes an inflatable pressure bag 11 and a sheet member 12 fixed to the pressure bag 11. The pressure bag 11 may be formed of any material as long as it can be inflated,
To apply a large pressure to the infusion bag 3 when inflated,
It is preferable to use a material that does not stretch. As such a material, a plastic sheet reinforced with a woven fabric is preferable, and the plastic sheet can be formed in the pressure bag 11 by heat-sealing the plastic sheet into a bag shape.

As shown in FIG. 2, the pressure bag 11 has a structure in which two sheets are fused, and
The rear portion 11a (the portion facing the front when worn) is slightly shorter than the rear portion 11b (the portion in contact with the patient). Therefore, in a state where the rear portion 11b is not inflated, both end portions of the rear portion 11b are in a state of standing forward.

An important feature of the present invention is that the back side of the pressurized bag 11 is expanded substantially without deformation even when the pressurized air is supplied. Here, “substantially no deformation” includes not only a case in which no deformation occurs at all but also a case in which deformation occurs to such an extent that the wearer does not feel uncomfortable. Specifically, at the time of maximum inflation,
It is sufficient that the degree of curvature of 11b is about 1 cm or less in height difference (height difference between the most protruding portion and both end portions).

In the example shown in FIG. 2 and FIG.
On the back side, a plate 13 having a strength that does not substantially deform when the pressure bag 11 is inflated is provided. The plate 13 can be formed of a hard plastic or the like. Plate 13
May be fixed to the outer surface of the rear portion 11b of the pressurized bag 11 by bonding or the like. It is preferable that another sheet material (not shown) is fixed thereon by fusing. Due to the plate member 13, even when the pressure bag 11 is inflated, the rear portion 11b of the pressure bag 11 does not substantially expand. Further, the rear portion 11b of the pressure bag 11 may be formed of a hard plastic or the like, and the front portion 11a may be directly fused to the rear portion 11b. Further, it is preferable to provide a flexible member 14 made of a polyurethane foam or the like outside the plate member 13 (on the patient side) in order to improve the mountability of the pressure bag means 1.

An air inlet 11d is provided at the lower end of the pressure bag 11, and an air pipe 20 is connected to the air inlet 11d in an airtight state. The air tube 20 itself may be a rubber tube or a plastic tube as long as it has flexibility, airtightness, and pressure resistance. At the end of the air pipe 20, an air supply means (a manual air pump in this example) 24 is provided. In addition, a plurality of hooks or rings 15 are attached to the upper end of the pressure bag 11.

The pressurized bag 11 additionally has a mechanical safety valve.
11e may be provided. The mechanical safety valve 11e is a pressurized bag
When the pressure in 11 reaches a certain level, for example 300 mmHg (corresponding to the patient's maximal blood pressure), it has a structure to open mechanically. For this purpose, the mechanical safety valve 11e may have a structure having a valve member receiving a constant pressing force by a spring, for example.

The capacity of the pressure bag 11 can be set according to the capacity of the infusion bag 3. Since the volume of the normal infusion bag 3 is 500 ml, 1000 ml and 3000 ml, it is preferable to prepare a pressurized bag 11 having a size corresponding to the capacity.

3 and 4 show a specific example of the pressure bag means of the present invention. The sheet member 12 is folded almost at the center
It is folded back and forth so that 12c is on the lower side,
Both side edges 12d, 12d of the front portion 12a of the sheet member 12 are fixed to both side edges 11c, 11c of the pressure bag 11, and an end 12e of the rear portion 12b of the sheet member 12 is an upper end of the pressure bag 11. It is fixed to the part. Therefore, the front part of the pressure bag 12
The rear portion 12a and the rear portion 12b are bag-shaped. Seat member 12
An opening 12f for exposing the infusion plug 3a of the infusion bag 3 is provided in the folded portion 12c of the infusion bag 3. The infusion bag 3 is supported by the sheet member 12, and the infusion bag 3 is connected to the pressure bag 11 and the sheet member 12. Held in between. The sheet member 12
Is so that the infusion bag 3 and the amount of infusion in it can be seen,
It is preferably formed of a net, a coarse mesh woven fabric, a transparent plastic film, or the like.

As shown in FIG. 3, the sheet member 12 of the portable infusion apparatus is provided with a pocket portion made of transparent plastic, so that the control unit 30 can be stored therein. The control unit 30 includes a control device 29, a pump 24,
The monitor unit 31 is a liquid crystal display or the like, and includes a power source 26 and the like (see FIG. 5). The pressure in the pressurized bag 11, the drop speed and amount of the infusion, the remaining amount of the infusion in the infusion bag 3 and the infusion time. Can be displayed. Control unit 30
The operation unit 32 has a power button, an operation / stop button, a mode switching button, a numerical adjustment button, and the like, so that a patient or the like can appropriately control the operation of the portable infusion device and the drip rate of the infusion. .

As shown in FIG. 2, when the infusion bag 3 is inserted into the gap between the pressure bag 11 and the sheet member 12 and the pressure bag 11 is inflated, the infusion bag 3 is separated from the pressure bag 11 and the sheet member 12. It is pressed almost uniformly. Due to this pressing force, the drip in the infusion bag 3 is pushed out from the infusion bag 3 at a substantially constant flow rate, and is injected into the patient from the infusion needle 10 through the infusion tube 5.

FIG. 5 shows an example of a configuration for automatically supplying air to the pressurized bag 11. In this case, a drip tube 6, an air bubble sensor 7, a clamp device 8, and an infusion needle 10 are provided in an infusion tube 5, which is hermetically attached to a stopper 3a provided at the lower end of the infusion bag 3.

A drop counter provided in the drip tube 6
61 is composed of an optical sensor including a light emitting unit such as a light emitting diode and a light receiving unit such as a phototransistor,
The infusion solution is set between the light emitting unit and the light receiving unit so as to drip. When the infusion drops, the light is blocked, and the light receiving unit detects it. By counting the number of times the light is blocked, the drop count number N can be obtained.

The bubble sensor 7 detects whether or not bubbles exist in the infusion flowing in the infusion tube 5. The bubble sensor 7 itself includes a light emitting unit and a light receiving unit as in the case of the drop counter 61, and may have a structure for detecting bubbles passing therebetween. When the bubble sensor 7 detects a bubble, a signal is sent to the control device 29, and the control device 29 issues a signal for closing the clamp device 8. At the same time, a signal for stopping the air pump 24 may be issued.

[2] Method for Controlling the Rate of Drop of Transfusion (A) First Mode (Pressure Back Pressure Control) As shown in FIG. 6, the control method of this mode is as follows: (1) Predetermined drop rate of infusion The pressure in the pressurized bag 3 that gives the pressure is determined in advance as a reference pressure P ₀ , and (2) data of the pressure P in the pressurized bag 11 detected by the pressure sensor 22 is sent to the control device 29,
(3) The detected pressure value P is compared with the reference pressure P ₀ by the control device 29. If the detected pressure value P is lower than the reference pressure P ₀ , a drive signal is sent to the air pump 24, and the detected pressure value P consists of feeding stop signal to the air pump 24 when higher than the pressure P _0.

(B) Second embodiment (addition by drop count number)
Control of Pressure in Pressure Bag) As shown in FIG. 7, the control method of this embodiment is as follows.
Desirable Drop Count N of Infusion During Time T₀In advance
Once determined, it is stored in the memory of the control device 29, and (2)
The infusion amount of the infusion at a predetermined time T is provided in the drip tube 6.
(3) Measured by the drop counter 61
The dropped drop number N is the reference count number N. ₀Compared with the drops
Lower count number N is reference count number N₀Empty if lower
Activating the air pump.

(C) Third embodiment (c) according to the drop count number
Control of the flow rate of the infusion solution passing through the ramp device) As shown in FIG.
Desirable Drop Count N of Infusion During Time T₀In advance
Once determined, it is stored in the memory of the control device 29, and (2)
The infusion amount of the infusion at a predetermined time T is provided in the drip tube 6.
(3) Measured by the drop counter 61
The dropped drop number N is the reference count number N. ₀Compared with the drops
Lower count number N is reference count number N₀More or less
In some cases, the clamping device 8 is used to reduce or increase the dropping speed.
Actuation in the direction.

(D) Other Embodiments In addition to the above embodiments, a pressure sensor 22, a drop counter
By combining the clamp 61 and the clamp device 8, it is possible to control the air pump 24 and / or the clamp device 8 by inputting the output of the pressure sensor 22 and / or the output of the drop counter 61. The safety valve 23 provided on the air pipe 20
More control methods are possible by using. Non-limiting specific examples thereof are, for example, as follows. (B) The air pump is operated based on the pressure P detected by the pressure sensor 22.
Controls both 24 and safety valve 23. (B) A method in which both the clamp device 8 and the safety valve 23 are controlled by the pressure P detected by the pressure sensor 22. (C) The drop count number N detected by the drop counter 61
Control the air pump 24 and the clamp device 8 together. (D) Drop count N detected by the drop counter 61
Control the safety valve 23 and the clamp device 8 together. (E) Drop count number N detected by drop counter 61
Controls the air pump 24, the safety valve 23 and the clamp device 8 together. (F) Based on the pressure P detected by the pressure sensor 22 and the drop number N detected by the drop counter 61, an air pump
A method of controlling both the 24 and the clamp device 8. (G) The air pump is operated based on the pressure P detected by the pressure sensor 22 and the drop number N detected by the drop counter 61.
24, a system that controls both the safety valve 23 and the clamp device 8. Each of the above control methods is described in detail in JP-A-2000-316970.

[0029]

As described in detail above, the portable infusion device of the present invention employs a method of inflating the pressurized bag for dropping the infusion, and the structure in which the back side of the pressurized bag is not deformed even when inflated. , A good wearing feeling can be obtained even when inflated.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the entire structure of a portable infusion device of the present invention.

FIGS. 2A and 2B are cross-sectional views taken along the line AA in FIG. 1, wherein FIG. 2A shows a state in which the pressure bag is contracted, and FIG. 2B shows a state in which the pressure bag is inflated.

FIG. 3 is a perspective view showing a specific example of a pressure bag means of the portable infusion device of the present invention.

FIG. 4 is a development view showing a sheet member used in the portable infusion apparatus of FIG.

FIG. 5 is a schematic view showing an automatically controlled portable infusion apparatus of the present invention.

FIG. 6 is a schematic diagram and a flowchart showing an example of a control method of the automatically controlled portable infusion apparatus of the present invention.

FIG. 7 is a schematic diagram and a flowchart showing another example of the control method of the automatically controlled portable infusion device of the present invention.

FIG. 8 is a schematic diagram and a flowchart showing still another example of the control method of the automatically controlled portable infusion device of the present invention.

[Explanation of symbols]

 1 ··· Pressure bag means 11 ·· Pressure bag 12 ··· Sheet member 13 ·························································・ Drip tube 61 ・ ・ ・ Drop counter 7 ・ ・ ・ Air bubble sensor 8 ・ ・ ・ ・ ・ ・ Clamp device 10 ・ ・ ・ ・ ・ ・ Infusion needle 20 ・ ・ ・ ・ ・ ・ Air tube 22 ・ ・ ・ ・ ・ ・ Pressure sensor 23 ・ ・ ・ ・ ・ ・ Safety valve 24 ... Air pump 26 ... Power supply 29 ... Control device 30 ... Control unit 31 ... Monitor unit 32 ... Operation unit

Continued on the front page F term (reference) 4C066 BB01 CC01 DD03 EE03 EE04 FF05 GG01 HH01 HH07 HH08 QQ35

Claims (6)

[Claims] 1. A pressure bag means for accommodating an infusion bag and pressurizing the infusion bag to allow the infusion to flow out, and air supply means for supplying pressurized air to the pressure bag means. The pressurizing bag means is fixed to the pressurizing bag in which only the front side is inflated without substantially deforming the back side even when the pressurizing air is supplied, and both side ends on the front side of the pressurizing bag. A sheet member adapted to hold the infusion bag between the pressure bag and the pressurized bag. 2. The portable infusion device according to claim 1, wherein a plate member having a strength that is not deformed by expansion of the pressure bag is provided on the back side of the pressure bag. apparatus. 3. The portable infusion device according to claim 2, wherein a flexible material is provided on the back side of the plate material. 4. The portable infusion device according to claim 1, wherein the sheet member is folded back and forth so that a folded portion is located substantially at the center at a lower side. The front end of the infusion bag is fixed to both end portions of the pressure bag, the rear portion of the sheet member is fixed to the pressure bag, and the infusion bag is discharged to the folded portion. An opening for exposing a stopper is provided, whereby the infusion bag is supported by the sheet member and held between the pressure bag and the sheet member. . 5. The portable infusion device according to claim 1, wherein said sheet member is made of a net. 6. The portable infusion device according to claim 1, wherein said air supply means is a manual pump or a pump driven by a motor.