JPH10314303A - Air pressure controlled infusion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the captioned apparatus to be carried handily with a smaller size by introducing pressurized air into a space between inner and outer bags being controlled by a pressure control section so that a liquid medicine flows out by a specified value from the inner bag to achieve infusion accurately regardless of the position of an infusion bad. SOLUTION: When a pneumatic supply source 20 is mounted at an inlet part 32 of a pressure control part 30, the closure of a closed container 21 is released and high pressure air inside flows out of an outlet. The high pressure air alone subjected to the first stage control limited to a specified pressure is supplied to a first chamber and further, enters a second chamber so that the air alone subjected to the second stage control limited to a specified pressure flows out. The air flows into a pace 12 between an inner bag 11 and an outer bag 13 through a hose 17 from an outlet part 37 to pressurize the inner bag 11. Thus, a liquid medicine M inside flows out to a liquid medicine supply hose 3 by a specified amount per unit time from a cannula needle 4a by a pressure suitable for the pressure of a vein to be sent into a blood vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a drip device,
In particular, the present invention relates to a compact and simple pneumatically controlled infusion apparatus capable of performing infusion without using an infusion stand.

[0002]

2. Description of the Related Art Blood in the human body is discharged by the pulsation of the heart and circulates through the whole body via blood vessels. This blood pressure inhibits infusion into the human body. If the infusion bottle, the infusion bag, or the infusion bag (hereinafter, referred to as an infusion bag) in which the medicinal solution is stored is lower than the cannula needle inserted into the patient, the medicinal solution does not flow into the blood vessel.
Therefore, the doctor suspends the drip bag 2 or the like on the drip stand 1 as shown in FIG. 6, and sets the position of the cannula needle 4b attached to the tip of the drug solution supply hose 3 lower than the drip bag 2, thereby reducing blood pressure. The drug solution is injected into the vein in opposition. In the figure, "5" is a drug solution reservoir, and "6" is a drip speed adjusting member.

[0003]

However, such an infusion device has a disadvantage that the patient must lie down so as not to move for a long time during infusion of the drug solution. In addition, when the patient moves to a remote place, such as when going to a doctor's office or a toilet, if the drip bag or the like is not always held at a high position to counter the blood pressure, the drip is not performed,
Or blood enters the drug solution through the cannula needle,
There is also a problem that a backflow phenomenon occurs.

An object of the present invention is to provide a pneumatically controlled drip infusion apparatus that can reliably perform infusion regardless of the position of an infusion bag, and that is compact and easily portable.

[0005]

According to a first aspect of the present invention, there is provided a pneumatic infusion apparatus according to the first aspect of the present invention, wherein a cannula needle is inserted into an infusion bag in which a predetermined drug solution is stored. In a drip infusion apparatus for taking out a drug solution in a drip bag to the outside and dispensing the drug to a patient via a drug solution supply hose and a cannula needle, the drip bag includes a deformable inner bag in which a drug solution is stored, and an outer periphery of the inner bag. A portable pneumatic supply source formed from an outer bag provided to surround and a connecting portion integrally connecting a part of both bags so as to create a space between the inner bag and the outer bag. The pressurized air from the air bag is introduced into the space while being controlled by the pressure control unit so that the chemical solution flows out of the inner bag by a predetermined amount.

[0006] In this way, the infusion can be performed reliably regardless of the position of the infusion bag, and the device can be compact and easily carried.

According to the second aspect of the present invention, the pressure control section includes a first cylinder section and a second cylinder section separated by a partition provided at the center in the axial direction inside a substantially cylindrical case. The first cylinder section is provided with a first pressure control section, the second cylinder section is provided with a second pressure control section, and the first cylinder section is provided with a first pressure control section. The pressure control section is repelled by the first spring member so as to always face the partition wall, and is formed in a first piston slidably provided in the first cylinder section, and formed in the tip end of the first piston on the partition side. The first chamber, a first passage formed in the case to guide air from the inlet to the first cylinder, and a first passage opened at a predetermined position of the first piston. Communicate with the first chamber And 1 hole, the spring force of the first spring member is controlled from outside of the case, the first passage and the first
A first screw mechanism for controlling a state of communication with the through hole, wherein the second pressure control section is repelled by the second spring member so as to always face the partition wall, and is slidable in the second cylinder section. A second chamber provided in the partition-side tip of the second piston;
A protrusion provided in the chamber, the protrusion being provided so as to control an opening of a small hole formed in the partition by sliding of the second piston, and a second chamber provided at a predetermined position of the second piston. A second through-hole opened to communicate with the first passage, the second passage formed in the case to guide air in the second chamber flowing out of the second through-hole to an outlet portion, A second screw mechanism that controls the spring force of the second spring member from outside the case and controls the degree of opening of the small hole by the protrusion and the state of communication between the second passage and the second through hole; By controlling the first and second screw mechanisms,
The air pressure guided from the inlet to the outlet is controlled in multiple stages.

With this configuration, the pressurized state of each piston of the first pressure control unit and the second pressure control unit is adjusted by controlling the first and second screw mechanisms, and the first piston controls the first passage. The first state of the compressed air from the pneumatic supply source is controlled by controlling the state of communication between the air passage and the first through hole. By controlling the communication state of the holes, the second stage control is performed, and by these controls, the pressure of the supply air can be limitedly controlled so as to be a predetermined pressure, as if the drip bag was suspended at a predetermined position. It is possible to discharge the chemical solution stably at the same constant pressure.

Further, since both pressure control sections are provided in one case, the overall configuration is simplified, and the apparatus is compact and easy to carry.

According to the third aspect of the present invention, in the pressure control section, an outlet for discharging air in the space is provided in the connecting section, and the air pressure in the space is set to a predetermined value or more at the outlet. It is characterized by having a safety valve part which opens when it comes to.

In this way, even if the pressure in the bag space becomes high during the pressure control, the pressure can be reduced automatically or easily by a manual operation, and the speed of the infusion is always kept normal or adjusted. You can also.

[0012] In the invention described in claim 4, the pneumatic supply source is constituted by a closed container whose outlet is closed by a ball valve, and when the closed container is attached to the inlet of the case, the inlet of the case is closed. The ball valve is configured to open the closed container by an operating rod provided in the container.

In this way, when the pneumatic supply source is replaced, it can be easily attached and detached.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a schematic partial cross-sectional view showing a pneumatically controlled infusion device according to an embodiment of the present invention.
3 is an enlarged view of a main part of the embodiment, FIG. 3 is an exploded perspective view showing a supply pressure control unit of the embodiment, FIG. 4 is a sectional view showing a pneumatic supply state of the supply pressure control unit, and FIG. It is sectional drawing which shows the air pressure stop state of the same supply pressure control part. Note that members common to those shown in FIG. 6 are denoted by the same reference numerals.

In FIG. 1, a pneumatically controlled infusion apparatus according to the present invention generally has an infusion bag 10 in which a predetermined chemical solution M is stored, and a pneumatic supply source for supplying compressed air to the infusion bag 10. And a pressure control unit 30 for controlling and flowing the pressurized air from the pneumatic supply source 20.

The infusion bag 10 is made of a deformable material such as polyethylene, vinyl chloride or the like, and has an inner bag 11 in which a predetermined chemical solution M is stored.
An outer bag 13 is provided between the inner bag 11 and the inner bag 11 so as to surround the outer periphery via a space 12 and is formed of the same material as the inner bag 11.
The ends of the two bags 11 and 13 are integrally connected.
And a connecting portion 14 for holding a space 12 therebetween.

As shown in FIG. 2, the connecting portion 14 at the end has a sealing plug 15 for holding a space 12 between the bags 11, 13, and the sealing plug 15 has a chemical solution supply hose. The cannula needle 4a attached to one end of 3 is penetrated,
Here, a hose holding portion 16 for securely holding the distal end of the chemical supply hose 3 is also provided. At the other end of the chemical supply hose 3, a cannula needle 4b is attached for insertion into a patient's arm or the like.

In the vicinity of the connecting portion 14 at the end,
A hose connecting portion 18 is formed to which a safety valve portion 70 to be described later and a tip end of an air hose 17 for introducing compressed air from the pneumatic supply source 20 into the space 12 between the bags 11 and 13 are connected.

The pneumatic supply source 20 is partially shown in FIGS. 4 and 5. The outlet 22 of a sealed container 21 in which high-pressure air such as a transportable air cylinder is sealed is connected to a ball valve 23.
Is closed by the Further, a partition wall 25 having a through hole 24 is provided in the sealed container 21, and between the partition wall 25 and the ball valve 23, a guide cylinder 25 a having the through hole 24 is provided. A coil spring 26 is provided to prevent high-pressure air in the closed casing 21 from leaking out when not in use.

When the sealed container 21 is attached to an inlet 32 of a case 31 described later, the ball valve 23 is displaced by an operating rod 33 provided at the inlet 32, and the closed container 2
1 is to be released.

It is preferable that the amount of air stored in the closed container 21 is equal to or larger than the amount required to cause all the liquid medicine M to flow out of the drip bag 10.

The pressure controller 30 has a spherical portion 31 at the center.
The case 31 has a substantially cylindrical case 31, and an inlet portion 32 to which the pneumatic supply source 20 is connected is provided above the spherical portion 31a of the case 31. Are the first cylinder part 34a and the second cylinder part 3
4b is formed coaxially.

The first cylinder 34a has an inlet 3
A first pressure control unit 35 that causes the air from the second unit 2 to flow at a predetermined pressure and a second pressure control unit 36 that causes the second cylinder unit 34b to cause the air from the first pressure control unit 35 to flow at a predetermined pressure and flow down Is provided.

An outlet 37 for supplying air under pressure to the space 12 of the drip bag 10 is provided below the spherical portion 31a.
And the air hose 1 connected to the outlet 37
7, the pressure-regulated air is introduced into the space 12 between the two bags 11, 13. In addition, an uneven portion 37a is formed on the outer peripheral surface of the outlet portion 37, thereby preventing the hose 17 from falling off.

The pressure control section 30 will be described in more detail. The first cylinder portion 34a and the second cylinder portion 34b
The first cylinder portion 34a is provided with a first piston 40 of the first pressure control portion 35 so as to be slidable inside the first cylinder portion 34a.

The first piston 40 has a partition wall 4 at the center.
0a is provided, and a front ring portion 40b is provided in front of the partition wall 40a, and has a H-shaped cross section provided with a rear ring portion 40c at the rear, and the first chamber 41 is provided in the front ring portion 40b. Is formed, and the rear ring portion 40c is formed.
Inside, a first spring member 42 is provided.

The first spring member 42 is connected to the partition wall 40.
a and a spring support member 43 slidably provided in the first cylinder portion 34b. The first piston 40 is always resiliently moved inward, that is, toward the partition 38. doing.

At the rear end of the first cylinder portion 34a, a first screw mechanism N1 is provided. The first screw mechanism N1 has a first adjustment bolt 45 screwed into a first cap 44 screwed to a rear end of the first cylinder portion 34a. It is in contact with the spring support member 43.

Therefore, if the first adjusting bolt 45 is rotated with respect to the first cap 44 to move forward and backward, the spring pressure balanced with the air pressure can be adjusted.
Thereby, the position of the first piston 40, that is, the first piston
The position of the ring groove 46 formed in the outer peripheral surface of the piston 40 in the substantially central portion in the axial direction is also adjusted, and the first passage 49 formed in the spherical portion 31 a is formed through the first through hole 48 formed in the ring groove 46. The air pressure flowing into the first chamber 41 is controlled by communicating or blocking the communication with the first chamber 41.

Here, the first passage 49 is provided obliquely in the spherical portion 31a, and when the first piston 40 is located at the forefront end, the first through hole 48 is provided at the outlet of the first passage 49. Part of the first chamber 4
1, the first spring member 4
When air at a pressure equal to or higher than the pressure set by the second adjustment bolt 45 and the first adjustment bolt 45 flows into the first through hole 4 by the first piston 40,
8 and the first passage 49 are disconnected. As a result, the pressure of the air from the pneumatic supply source 20 can be controlled only by operating the screw mechanism N1 from outside the case 31.

A second piston 50 of the second pressure control section 36 is slidably provided inside the second cylinder section 34b.

The second piston 50 has a partition wall 5 at the center.
0a is provided, and a front ring portion 50b is provided in front of the partition wall 50a, and a rear ring portion 50c is provided in the rear portion to form an H-shaped cross section.

The front ring portion 50b has a second
A chamber 51 is formed, and a small hole 3 formed in the partition wall 38 from the partition wall 50a is formed in the second chamber 51.
8a, the conical protrusion 52 is projected, and the small hole 3
8a can be controlled.

A second spring member 54 is provided in the rear ring portion 50c.
Is interposed between the partition wall 50a and a spring support member 53 provided to be slidable in the second cylinder portion 34b, so that the second piston 50 is always inward, that is, It is repelled to head.

Therefore, the position of the foremost end of the conical projection 52 is regulated by the contact of the front ring portion 50b with the partition wall 38.
Is slightly projected from the front end of the front ring portion 50b, and the diameter of the small hole 38a of the partition wall 38 is reduced or increased by the balance with the spring force of the second spring member 54 to control the pressure of the air flowing therethrough. I do.

A second screw mechanism N2 is provided at the rear end of the second cylinder portion 34b. In the second screw mechanism N2, a second adjustment bolt 56 is screwed into a second cap 55 screwed to the rear end of the second cylinder portion 34b. It is in contact with the spring support member 53.

Therefore, if the second adjusting bolt 56 is rotated with respect to the second cap 55 to advance and retreat, the spring force of the second spring member 54 can be adjusted, and as a result, the second adjusting bolt 56 in the second cylinder portion 34b can be adjusted. The balance position of the second piston 50 with respect to the air pressure is controlled, the position of the ring groove portion 57 formed on the outer peripheral surface of the second piston 50 at the substantially central portion in the axial direction is also adjusted, and the second through hole 58 formed in the ring groove portion 57 is adjusted. The air pressure flowing out of the second chamber 51 is controlled by communicating or blocking the second passage 59 formed in the spherical portion 31a and the second chamber 51 via the second passage 51.

Here, the second passage 59 is provided obliquely in the spherical portion 31a, and when the second piston 50 is located slightly behind the foremost end, the second through hole 59 is formed in the second passage 59. The air flows at a maximum flow rate from the second chamber 51 so as to completely coincide with the outlet portion of the passage 59.
As a result, the pressure of the air from the first chamber 41 can be controlled only by operating the second screw mechanism N2 from outside the case 31.

As shown in FIG. 2, a safety valve portion 70 for discharging air introduced into the space 12 between the bags 11, 13 to the outside is provided near the connection portion 14. The safety valve 70 is provided with a recess 7 formed in the bag 10.
1 has a metal housing 73 firmly fitted via a seal ring 72, and a third adjustment bolt 74 is screwed to this housing 73 so as to be able to advance and retreat.

The third adjusting bolt 74 is provided with a disk-shaped operating portion 75 at an end protruding to the outside, a valve portion 76 at the tip, and rotates a shaft portion 75 to be screw-operated. This allows the valve portion 76 to exhaust air from the through hole 80 while adjusting the opening of the air discharge port 77. Note that the valve portion 76 may be separately formed so as to slide with respect to the shaft portion 75, and may be pressurized by a spring 79 provided between the valve portion 78 and the base 78.

The pressure at which the drip bag 10 is pressurized can be adjusted by such a safety valve section 70, whereby the air pressure in the space 13 can be maintained at an appropriate value. If the air pressure exceeds a set limit, the valve section 76 can automatically retract to vent excess pressure to the outside.

Next, the operation will be described. Initially, the first piston 40 is at the forefront position by the spring force of the first spring member 42 as shown in FIG. Thereby, the first passage 49
The first chamber 41 communicates with the first chamber 41 via the first through hole 48, and the second piston 50 is also at the foremost end position.

When the pneumatic supply source 20 is attached to the inlet 32 of the case 31, the ball valve 2 is actuated by the operating rod 33.
3 is displaced against the spring force of the coil spring 26, the closed container 21 is unblocked, and the high-pressure air inside flows out from the outlet 22.

The high-pressure air flowing out of the outlet 22 first passes through the first passage 49 and flows into the first chamber 41 through the first through hole 48.

However, at the initial stage, the air supply 20
Since the air from the air cylinder is quite high pressure,
Due to this high pressure, the first piston 40 immediately retreats against the spring force of the first spring member 42. Therefore, the high-pressure air slightly flows into the first chamber 41, but the first passage 4
Since the communication between 9 and the first chamber 41 is interrupted, the flow into the first chamber 41 is immediately stopped. That is, only air that has been subjected to the first-stage control limited to the predetermined pressure is supplied to the first chamber 41.

When the air flowing into the first chamber 41 is higher than the spring force of the second spring member 54, the conical projection 52 is pushed, and an appropriate gap is created between the small projection 38 and the small hole 38a. Then, the air enters the second chamber 51 through this gap, and flows out of the second passage 59 through the second through hole 58. That is, the second
As for the air from the chamber 51, only the air subjected to the second-stage control limited to the predetermined pressure is discharged.

This air passes through the hose 17 from the outlet 37 and flows into the space 12 between the inner bag 11 and the outer bag 13, and pressurizes the inner bag 11 by the pressure, thereby causing the liquid medicine M inside to flow into the vein. At a predetermined amount per unit time at a pressure suitable for the pressure, and flows out from the cannula needle 4a to the drug solution supply hose 3, and is sent into the blood vessel.

As described above, when the air pressure in the second chamber 51 decreases, the spring force of the first spring member 42 overcomes the air pressure in the first chamber 41, the first piston 40 moves forward, and the first passage again. 49 and the first chamber 41
The air from the pneumatic supply source 20 is introduced into the first chamber 41 by communicating through the through hole 48.

In this way, the air pressure from the air pressure supply source 20 is automatically regulated while being supplied, and the infusion is performed.

If the air pressure in the space 12 of the drip bag 10 becomes high during this drip, the safety valve 70 of the drip bag 10 is operated, and the excessive air pressure is discharged to the outside. Thereby, the liquid medicine M can always be supplied to the patient in an appropriate state.

As a result, the pneumatically controlled infusion device described above has an excellent function that the drip bag does not have to be hung on the stand to obtain the pressure difference, and the patient can carry the infusion device in his or her pocket and carry around. It will demonstrate the nature.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention. For example, the pneumatic supply source 20 is not limited to the air cylinder alone, and a small electronically operated compressor may be used. Further, the pneumatic supply source 20, the pressure control unit 30, etc. may fail, or the pneumatic supply source 2
When there is no more air in the chamber 0, blood may flow backward, and a check valve may be provided in the chemical supply hose 3 to prevent such a situation from occurring.

[0053]

As described above, according to the first aspect of the present invention, the infusion can be reliably performed irrespective of the position of the infusion bag, and it is also compact and easy to carry. Becomes

According to a second aspect of the present invention, the first and second stages control the pressure air from the pneumatic supply source by controlling the first and second screw mechanisms to reduce the pressure of the supply air. Reduces the pressure to a predetermined pressure, and enables stable discharge of the drug solution at a constant pressure. In addition, since both pressure controllers are provided in one case, the overall configuration is simplified, compact and easy to carry. Becomes

According to the third aspect of the present invention, when the pressure in the bag becomes high during the pressure control, the pressure can be reduced automatically or easily by a manual operation, and the speed of the infusion is always kept normal or adjusted. You can also.

According to the fourth aspect of the present invention, the pneumatic supply source to be replaced can be easily attached and detached.

[Brief description of the drawings]

FIG. 1 is a schematic partial sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the embodiment.

FIG. 3 is an exploded perspective view showing a supply pressure control unit of the embodiment.

FIG. 4 is a sectional view showing a pneumatic supply state of the supply pressure control unit.

FIG. 5 is a cross-sectional view showing a pneumatic stop state of the supply pressure control unit.

FIG. 6 is a schematic view showing a general infusion apparatus.

[Explanation of symbols]

 4a, 4b: cannula needle, 10: drip bag, 11: inner bag, 12: space, 13: outer bag, 14: connection, 20: pneumatic supply source, 21: sealed container, 22: outlet, 23: ball Valve: 30: Pressure control unit: 31: Case: 32: Inlet unit: 33: Operating rod, 34a: First cylinder unit, 34b: Second cylinder unit, 35: First pressure control unit: 36: Second pressure control Part, 37 ... outlet part, 38 ... partition wall, 38a ... small hole, 40 ... first piston, 41 ... first chamber, 42 ... first spring member, 46 ... first passage, 47 ... first through hole, 50 ... Second piston 51 51 Second chamber 52 Projection 54 Second spring member 58 Second through hole 59 Second passage 70 Safety valve part 77 Outlet M Liquid chemical N1 ... first screw mechanism, N2 ... second screw mechanism.

Claims (4)

[Claims] 1. A cannula needle (4a) is inserted into a drip bag (10) in which a predetermined drug solution (M) is stored, the drug solution (M) in the drip bag (10) is taken out, and the drug solution is supplied. hose
(3) and an infusion apparatus for administering medication to a patient via a cannula needle (4b), wherein the infusion bag (10) is a deformable inner bag (11) in which a drug solution (M) is stored, and the inner bag (11) An outer bag (13) provided to surround the outer periphery of (11), and both bags so that a space (12) is created between the inner bag (11) and the outer bag (13).
(11, 13) and a connecting part (14) for integrally connecting the parts, and pressurized air from a portable pneumatic supply source (20) is supplied from the inner bag (11) to a chemical solution (M ) Is controlled by the pressure control unit (30) such that the space (12)
A pneumatically controlled infusion device characterized by being introduced into the inside. 2. The pressure control section (30) includes a first cylinder section (34a) and a first cylinder section (34a) partitioned by a partition wall (38) provided at the center in the axial direction inside a substantially cylindrical case (31). 2 cylinder section
(34b) and by opening a small hole (38a) in the partition wall (38), the two cylinder portions (34a, 34b) communicate with each other, and the first cylinder portion (34a) has a first pressure control portion. (35),
The second cylinder section (34b) is provided with a second pressure control section (36), and the first pressure control section (35) is controlled by a first spring member (42) so as to always move toward the partition wall (38). First piston (40) repelled and slidably provided in first cylinder portion (34a)
A first chamber (41) formed in the partition-side end of the first piston (40), and the first chamber (41) so that air from the inlet (32) is guided to the first cylinder (34a). Case
(31) a first passage (49) formed in the first piston;
A first through hole (48) opened at a predetermined position of the first passage (49) and communicating with the first passage (49) and the first chamber (41);
A first screw mechanism (N1) for controlling the spring force of (42) from the outside of the case (31) to control a communication state between the first passage (49) and the first through hole (48). The second pressure control section (36) is always repelled by the second spring member (54) toward the partition wall (38), and is slidably provided in the second cylinder section (34b). The second piston (50)
A second chamber (51) formed in the partition-side end of the second piston (50); and a second chamber (51) provided in the second chamber (51). The partition
A projection (52) projecting so as to control the opening of the small hole (38a) opened in the (38); and a second chamber (51) at a predetermined position of the second piston (50). A second through-hole (58) opened to communicate with the case (5) so as to guide air in the second chamber (51) flowing out of the second through-hole (58) to an outlet (37). The spring force of the second passage (59) formed in the inside (31) and the second spring member (54) is controlled from outside the case (31), and the small hole (38a ), And a second screw mechanism (N2) for controlling a communication state between the second passage (59) and the second through hole (58), and the first and second screw mechanisms (N1, N2) to control the air pressure guided from the inlet portion (32) to the outlet portion (37) in multiple stages.
4. The pneumatically controlled infusion device according to item 1. 3. The pressure control section (30) includes a connection section (14).
A discharge port (77) for discharging air in the space (12) is provided.The safety valve (70) is opened to the discharge port (77) when the air pressure in the space (12) becomes equal to or higher than a predetermined value. 3. The pneumatically controlled infusion device according to claim 1, wherein 4. The pneumatic supply source (20) is configured such that an outlet (22) is constituted by a closed container (21) in which a ball valve (23) is closed, and the closed container (21) is connected to the case (31). When attached to the entrance (32), the operating rod (3) provided at the entrance (32) of the case (31)
The pneumatically controlled infusion device according to any one of claims 1 to 3, wherein the ball valve (23) opens the closed container (21) by 3).