JPH06319798A - Transfusion pump - Google Patents

Abstract

PURPOSE:To prevent the lowering of resilience of a tube with the use by isolating a plurality of finger cams at a specified interval to make a vermiculation of a plurality of fingers while the fingers are isolated at a fixed interval in a vermiculation type finger pump. CONSTITUTION:In a vermiculation type transfusion pump for dosing a medical fluid or the like, a plurality of fingers 4 are arranged to move the position of squeezing a feed fluid tube 2 sequentially with the vermiculation and with the rotation of a plurality of finger cams 18, the fingers 4 are subjected to a vermiculation. The feed fluid tube 2 is received and supported with a receiving member 8 energized in the direction of the fingers 4 with a pressing member 13 such as spring. Here, the finger cams 18 and the fingers 4 are so arranged to be isolated at a fixed interval. Thus, after a tube 2 is pressed to be closed with one arbitrary finger 4, the closing of the tube being pressed is released with the arbitrary finger 4 when the tube is pressed to be closed with the other finger 4 thereby eliminating the resilience of the tube 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infusion pump for administering a liquid medicine, and more particularly to a peristaltic finger pump.

[0002]

2. Description of the Related Art Conventionally, in this type of infusion pump, an improved finger shape has been disclosed in Japanese Patent Laid-Open No. 62-8764 in order to improve the accuracy of the injection amount.

[0003]

However, when the injection time is long, for example, 24 hours, the tube is pressed and closed by the next finger before the tube is not closed, so that the injection amount of the injection time is reduced. Change over time,
In addition, since the tube is continuously pressed, the restoring force of the tube gradually weakens continuously after long-term injection, and there is a problem that the tube does not finish within the initially set time.

In view of the above problems, it is an object of the present invention to provide an infusion pump in which the amount of injection is almost constant even when injection is performed for a long time.

[0005]

According to the present invention, such an object is to provide a plurality of fingers which are pressed and closed so as to sequentially move the crushed position of the liquid feeding tube by peristaltic movement,
A plurality of finger cams having an eccentric shaft for driving the plurality of fingers in a peristaltic motion, a pump base portion for driving the finger cams, a tube provided movably with respect to the base portion and for closing the tube by the peristaltic movement. An infusion pump including a receiving member serving as a receiving portion, which is achieved by spacing the finger cams by a predetermined distance and also spacing the fingers by a predetermined distance.

[0006]

According to the present invention, since the finger cams are spaced by a predetermined distance and the fingers are also spaced by a predetermined distance, they are pressed and closed by any one finger and then by another finger. In this case, any one of the pressure closures is released, so that the tube can always be pressed with a constant force even during long-term injection. For this reason, even if the infusion pump is operated for a long time, it can be completed within the time of the initial setting. Also, since there is an interval between the pressing points, the restoring force is maintained in the unpressed part of the tube, so the restoring force of the tube does not decrease over a long period of time, so a stable injection volume can be achieved. Can be maintained.

The interval between the finger cams depends on the width of the finger tip (tube pressing portion), but when the finger cam thickness is about 3 to 10 mm, it is about 1 to 4 m.
It is preferably m. If it is less than 1 mm, the interval between the fingers that come into contact is narrowed, and if it exceeds 4 mm, rattling may occur between the fingers and the finger cam, which is not preferable.

The tip of the finger (tube pressing portion)
Width of 2 to 6 mm is preferable and 2 mm
If it is narrower, the pressing surface of the tube becomes smaller, and the liquid transfer amount cannot be made large, and if it exceeds 6 mm, the pressing surface of the finger becomes large and the restoring force of the tube becomes weak. 2mm to 5mm as the distance between the tips
Is preferred. The finger cam spacing is the spacing of the portions where the finger cams and fingers are in contact.

Further, since the receiving member is supported by the two pressing members, the upper end portion and the lower end portion of the pressing member are
Since it can be moved back and forth and left and right, the tube can always be pressed with a constant force even when injecting for a long time, and the accuracy of the infusion volume of the infusion can be improved, so that the infusion pump can be used for a long time. Even if it runs, it can be finished within the default time.

Further, it is preferable that the two pressing members are provided at positions where the length of the receiving member in the vertical direction is substantially divided into three equal parts.

A compression coil spring is preferably used as the pressing member.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the infusion pump of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view of an infusion pump according to an embodiment of the present invention. In the figure, the infusion pump 1 is formed in a box shape as shown, and the entire infusion pump 1 is covered with a silicon-based resin film 5. A handle 15 is provided at the center of the upper surface of the infusion pump 1 to make it portable, and it can be used even when the operation panel 3 is up. An operation panel 3 is provided on the left side of the front surface of the infusion pump 1. On the other hand, on the right side of the front surface, a lid 6 having a fulcrum 6b as a fulcrum is rotatably and openably supported, and the lid 6 is fixed to the infusion pump 1 by a lock mechanism (not shown). is doing.

A receiving member 8 is provided inside the lid 6 for receiving a finger which is pressed by the pressing member 13 in the finger direction. The pressing member 13 constantly receives a constant pressure on the tube.

On the other hand, on the upper and lower edges of the lid body 6, arcuate notches 6a are formed by two-dot chain lines so that the liquid-feeding tube 2 for feeding the illustrated chemical solution is inserted. Further, the infusion pump 1 having the above-described configuration is provided with the infusion mechanism section 16, and the plurality of fingers 4 built in the infusion mechanism section 16 closes the lid body 6 and puts it in the locked state. It is configured to be able to perform a peristaltic movement with respect to the liquid feeding tube 2 shown by a chain line.

FIG. 2 is a vertical sectional view of the liquid transfusing mechanism portion 16 of the liquid transfusing pump 1 of FIG. 1, showing the relationship between the fingers 4, the receiving member 8, the liquid feeding tube 2 and the pressing member 13. Further, the mechanism for driving the finger 4 in the direction of pressing the liquid feeding tube 2 is a finger cam 18 fixed to the rotating shaft 14.
Are brought into sliding contact with each other.

The finger cam 18 is provided so as to be fixed by being displaced by a predetermined angle in the radial direction of the rotary shaft 14 so that the plurality of fingers 4 perform a peristaltic movement.

The finger cams 18 are spaced from each other by a predetermined distance, and the fingers 4 are also spaced from each other by a predetermined distance.

The separation distance at this time is, for example, the finger 4
When the tip has a thickness of about 3 mm, the finger cam has a thickness of about 4 mm and the finger cam 18 has an interval of about 4 mm.

Further, since the receiving member 8 is supported by the two pressing members, the upper end portion and the lower end portion of the pressing member can be moved forward, backward, leftward and rightward, so that the tube is always subjected to a constant force even during long-term injection. It can be pressed with. For this reason, even if the infusion pump is operated for a long time, it can be completed within the time of the initial setting.

Further, by providing the two pressing members at positions where the length of the receiving member in the vertical direction is divided into three substantially equal parts, the followability with respect to the tube becomes excellent, and more accurate injection of the infusion solution is achieved. Will be able to.

Further, as the pressing member 13, a usual spring spring is used, but a compression coil spring is more preferably used.

FIG. 3 is a sectional view of the infusion pump of the present invention taken along the line AA in FIG. 2, showing the tube 2 being pressed toward the receiving member 8. In this state,
The receiving member 8 is provided between the receiving member 8 and the lid body 6, and the pressing member 13 supporting the receiving member 8 presses the liquid feeding tube 2
Is closed. Further, the plurality of fingers 4 are configured to perform a peristaltic motion by rotating the rotary shaft 14.

In addition, the base portion 7 around the fingers 4 has a V
By forming the V-shaped groove portion 17a and the receiving member 8 contacting the groove line portion 17b, a triangular column-shaped space portion having a substantially triangular cross section is formed along the longitudinal direction of the liquid feeding tube 2. . The receiving member 8 presses the liquid feeding tube 2 by the pressing member 13 on the back surface, and when the pressure generated when the liquid feeding tube 2 is closed is equal to or higher than a predetermined pressure,
The pressing member 13 is compressed to prevent damage to the liquid feeding tube 2. Further, the mechanism for driving the finger 4 in the direction of the finger movement arrow P is configured such that the finger cam 18 fixed to the rotating shaft 14 slides in the guide hole 4a formed in the finger 4 as shown in the drawing, thereby causing the finger 4 to move.
Is driven in the direction of the double-headed arrow P, and the finger cam 18 is fixedly provided in the radial direction of the rotary shaft 14 while being displaced by a predetermined angle, so that the peristaltic movement by the plurality of fingers 4 is performed. In the maximum closed state, as shown in the figure, the finger 4 can move to the inside of the groove 17a. Here, it goes without saying that there are many configurations for performing a peristaltic movement by a plurality of fingers other than those described above, and the mechanism, type, etc. do not matter.

[0025]

As described above, according to the present invention, a plurality of fingers that are pressed and closed so as to sequentially move the crushed position of the liquid feeding tube by the peristaltic movement, and the eccentric shaft that drives the plurality of fingers in the peristaltic movement. An infusion pump comprising a plurality of finger cams, a pump base portion for driving the finger cams, and a receiving member which is movably provided with respect to the base portion and serves as a receiving portion for pressing and closing the tube by the peristaltic movement. Therefore, the finger cams are separated by a predetermined distance, and the fingers are also separated by a predetermined distance.

Therefore, according to the present invention, the finger cams are spaced by a predetermined distance, and the fingers are also spaced by a predetermined distance. Therefore, after being closed by any one finger, it is pressed by another finger. When closed, any one of them is released, so that the restoring force of the tube is not diminished, and the tube has a constant restoring force even when injecting for a long time. There is nothing to do. For this reason, even if the infusion pump is operated for a long time, it can be completed within the time of the initial setting.

[Brief description of drawings]

FIG. 1 is an external perspective view of an infusion pump 1 showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of an infusion mechanism portion 16 of the infusion pump 1 showing the embodiment of the present invention.

3 is a transverse sectional view taken along the line AA in FIG.

[Explanation of symbols]

1 infusion pump, 10 drug solution bottle, 2
Liquid supply tube, 11 chemical solution outlet, 3 operation panel, 4 fingers, 13 spring, 4a guide hole, 14 rotating shaft,
5 Silicone Resin Film, 15 Handle, 6 Lid, 16 Infusion Mechanism Section, 6a
Notch, 17 base, 6b fulcrum,
17a groove, 7 leaked chemical,
17b groove line portion, 8 receiving member,
18 finger cams, 9 infusion devices,
P finger movement arrow,

Claims (1)

[Claims] 1. A plurality of fingers which are pressed and closed so as to sequentially move the crushed position of the liquid feeding tube by peristaltic movement,
A plurality of finger cams having an eccentric shaft for driving the plurality of fingers in a peristaltic motion, a pump base portion for driving the finger cams, a tube provided movably with respect to the base portion and for closing the tube by the peristaltic movement. An infusion pump comprising a receiving member serving as a receiving portion, wherein the finger cams are spaced by a predetermined distance and the fingers are also spaced by a predetermined distance.