JP3223492B2 - Roller clamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller clamp for controlling a flow rate of a liquid passing through a plastic tube, and more particularly to a roller clamp formed on a pair of side walls formed from both corners of a bottom plate. Alternatively, the roller pressing the plastic tube is guided by the side wall having the ridge portion having a planar shape, whereby the plastic tube is pressed uniformly by the roller, and the liquid passing through the plastic tube is supplied at a constant flow rate. The present invention relates to a roller clamp that can be used.

[0002]

2. Description of the Related Art In a drip set for continuously supplying a drug solution such as Ringer's solution or amino acid or blood to a patient, a roller clamp provided in the middle of a liquid guide tube can adjust the amount of liquid supply to the patient. , Commonly used widely.

FIG. 4 is an explanatory view of a drip set device.
The drug solution is put into the glass bottle 20, and the injection needle 24 is pierced straight into the rubber stopper. The roller position of the roller clamp 27 is determined in advance at a predetermined position below the water surface of the glass bottle 20, and the tube 29 is completely closed by the roller. Next, the glass bottle 20 is hung upside down, and the drip tube 26 is crushed and released with a finger, and the drug solution is filled in the drip tube 26 to about half. Next, the roller position of the roller clamp 27 is loosened, the drug solution is caused to flow out of the venous needle 28, the air in the tube is completely removed, and the tube 29 is closed again by the roller.

Thereafter, the ventilation needle 23 is pierced into a rubber stopper,
The venous needle 28 is fixed to a predetermined position below the water surface of the glass bottle 20, and a predetermined number of drops is determined while gradually loosening the roller of the roller clamp 27 to inject the drug solution into the patient. In the figure, reference numeral 25 denotes a photoelectric tube. As such a roller clamp,
The plastic tube inserted in the elongated hollow box,
Japanese Patent Application Laid-Open No. 1-265974 discloses a device for adjusting the flow rate of a liquid passing through a tube by pressing the tube with a movable roller to deform the lumen of the tube.
The roller clamp disclosed in Japanese Patent Application Laid-Open No. 1-265974 is shown in FIG.
Is a cross-sectional view in the width direction.
9a and 39b are tightened by the side wall 37 to prevent the rollers from loosening, the plastic tube 32 is pressed, the cross section is deformed, and the liquid passes through the bore 35 formed at the center of the flat plate groove 38. are doing.

However, when these roller clamps are incorporated in a drip set and a medicinal solution is infused, the number of infused drops with time, and there is a disadvantage that a constant amount of liquid is not always supplied at a predetermined speed. I understood.

[0006]

In this roller clamp, the problem that the drip speed is changed is slightly improved by tightening the outer peripheral corner of the roller with the side wall to prevent the roller from loosening.
When the liquid medicine is injected into the human body for a long time due to the inclination of the roller in the width direction, the rate of change in flow rate is still large, and there is a need for the development of a roller clamp that can be injected into the human body at a constant drip rate during long-term infusion. Was.

SUMMARY OF THE INVENTION The present invention has been made to meet such a demand, and an object of the present invention is to correct the widthwise inclination of a roller of a roller clamp, thereby uniformly pressing a plastic tube and maintaining the same for a long time. The present invention is to provide a roller clamp capable of instilling at an infusion speed of 1 mm.

[0008]

FIG. 2 is an example in which the upper surface of the projection of the roller clamp of the present invention has a curved surface shape and is a cross-sectional view in the width direction. The present invention relates to a roller for pressing a plastic tube. 11 is misaligned with the spindles 14a and 14b.
Even when 1 occurs, a pair of upper surfaces provided at least at positions higher than the thickness of the pressed and flat plastic tube of the pair of left and right side walls 17 erected from both corners of the bottom plate. Is a protruding portion 8a having a curved surface or a planar shape.
And 8b are formed, and the distance d1 between the pair of protrusions is
Roller width D1 and each protrusion 8a,
By correcting and guiding the width direction of the roller 11 with 8b,
The roller clamp is characterized in that the roller 11 is substantially horizontal and uniformly presses the plastic tube.

Further, in the roller clamp according to the present invention, the guide grooves for supporting the left and right support shafts of the roller are substantially at the same height at all points, and the ridges provided on the side walls for guiding the roller width are substantially the same. The roller clamp has a thickness and is formed continuously in parallel in a vertical direction (roller traveling direction).

Further, the present invention is the roller clamp, wherein the distance between the pair of ridges on the side wall is substantially equal to the roller width.

[0011]

Since the present invention has such a structure,
The plastic tube inserted into the roller clamp is slid along the guide shaft of the roller along the guide groove, and further slid in the width direction of the roller using the ridges on the side walls as guides, so that the plastic tube is evenly distributed by the roller. Pressed. That is, the plastic tube 12 inserted between the roller 11 and the bottom plate of the V-groove 6 has its upper surface corrected to be curved or planar ridges 8a and 8b.
And is fixed at the sides 9a and 9b. The plastic tube 12 is flattened at the side portions 9a and 9b, and the lumen 7 is tightly adhered at the side portion and does not pass the liquid, but the liquid is supplied from the lumen 7 formed by the V groove 6. The outflow velocity of the fluid flowing through the plastic tube 12 is determined by the size of the sectional area of the lumen 7. Further, since the deformation of the lumen of the plastic tube is small, the liquid can be supplied from the lumen at a constant speed while the deformation state of the lumen is kept constant.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of the roller clamp of the present invention. FIGS. 2, 3, and 4 are as described above, and FIG. 5 is a graph showing the change over time in the rate of change in flow rate during infusion. is there.

In the figure, 1, 11, and 31 are rollers, 2, 12,
And 32 are plastic tubes, 3, 13 and 33 are guide grooves, 4, 14 and 34 are roller shafts, 39 is outer peripheral corners of rollers, 5 is a bottom plate, 6 is a V groove, 36 is a flat groove,
7 and 35 are the lumens of the plastic tube, 8 and 38
Indicates a ridge, and 17 and 37 indicate side walls.

As shown in FIG. 1, the right and left support shafts 4 of the roller 1 are slidably movable along guide grooves 3 provided substantially horizontally on the side wall 17. The bottom plate 5 has a structure in which the surface is inclined with respect to the guide groove 3, and the wall thickness gradually increases continuously in the vertical direction. The degree of pressing of the plastic tube 2 inserted between the roller 1 and the bottom plate 5 is adjusted by the movement of the roller 1 so that the sectional area of the inner cavity of the plastic tube 2 is determined.

As shown in FIG. 2, a pair of ridges 8a and 8b having a curved or planar upper surface are formed on the side wall 17, and the distance between the ridges 8a and 8b is the same in the vertical direction. It has a certain structure. Then, the roller 1 in which the roller 11 is straightened by the ridges 8a and 8b, and
A plastic tube 12 inserted between the bottom plate 1 and the bottom plate 5
Is pressed by the roller 11 and both ends thereof are side portions 9a and 9b.
Fixed flat, the lumen is in close contact and liquid does not pass through,
The liquid is supplied from a lumen 7 formed between the V grooves 6. The outflow velocity of the liquid flowing through the plastic tube is determined by the size of the sectional area of the lumen 7.

On the other hand, the ridges 8a and 8b preferably have substantially the same shape, and the upper surface does not protrude at an acute angle, and has a curved or planar shape. It is preferable that both corners of the upper surface of the ridge having a planar upper surface have a curved structure. The plastic tube 12 has a ridge 8a.
And 8b are pressed by the straightened roller 11 and fixed at the side portions 9a and 9b.
The drug solution flows out while keeping the cross-sectional area of the lumen 7 constant.

Further, when the center S1 of the shafts 14a and 14b of the roller 11 is misaligned, the inclination of the roller is eliminated because the roller width length D1 is equal to the distance d1 between the ridges. Since the upper surface in the direction supports the support shaft of the roller, the height E1 of the fixed portion of the plastic tube is F1.
, The cross-sectional shape of the lumen 7 of the plastic tube 12 is stabilized, and the flow rate of the passing liquid is adjusted to be constant.

In the conventional roller clamp shown in FIG. 3, when the support shafts 34a and 34b of the roller 31 are misaligned S2, the roller width length D2 is 0.2 to 0.2 times larger than the distance d2 of the side wall.
A part of the outer peripheral corners 39a and 39b of the roller comes into contact with the side wall to press the plastic tube, and the elastic reaction force of the plastic tube further lifts and tilts the roller 31. A difference occurs between the heights E2 and F2 of the tube fixing portions, and the pressing of the plastic tube 32 becomes uneven,
The shape of the lumen 35 of the plastic tube 32 becomes unstable, and it tends to be difficult to adjust the flow rate of the passing liquid.

As the plastic tube, a flexible resin such as polyethylene, polypropylene, polyvinyl chloride or the like is used.

The roller clamp of the present invention can be made of metal, plastic, wood, etc., but plastics such as polyethylene, polypropylene, polymethacrylate, polycarbonate, polyvinyl chloride and ABS resin are preferred.

In FIG. 1, an AB having a support shaft 4 of an ABS resin roller (diameter: 15.0 mm) fitted in a guide groove 3 is shown.
Using a roller clamp formed of S resin in the examples, an outer diameter of 3.83 mm, an inner diameter of 2.53 mm, and a wall thickness of 0.65 mm
Polyvinyl chloride (BIV-9939N manufactured by Riken Chemical Co., Ltd.)
And insert the roller 1 at 60 drops / min.
Was moved, and a drip test was performed for 30 minutes using the drip set device of FIG.

The bottom plate of the roller clamp used had a structure in which the angle α in FIG. 2 was 110 degrees and the height H was 0.8 mm.

In the drip test, the drip set shown in FIG. 4 was used, the roller position of the roller clamp 27 was set at about 500 mm below the surface of the glass bottle 20, and the venous needle 28 was fixed at about 1000 mm below the surface of the glass bottle 20. Water was placed in a glass bottle and the infusion rate was 60 drops / min in the usual way. Next, a photoelectric tube 25 (LX-130R manufactured by KEYENCE CORPORATION) is installed at a position where the drip can be detected in the drip tube 26, and a drip counter (CBM / 132 manufactured by Citizen) is installed.
0) was activated, the number of infusions for 30 minutes was recorded, and the flow rate was calculated by the following equation.

Flow rate change rate = (Set drop number−Measurement drop number) ÷ Set drop number The flow rate change rate in the above embodiment is shown in FIG.

The same test as that of the example was performed using the roller clamp of FIG. 1 in which the cross section in the width direction of the roller clamp had the shape of FIG. 3 as a comparative example. In FIG. 3, the height of the ridge 38 is 0.2 mm, and the height from the bottom of the flat groove 36 to the ridge 38 is 0.2 to 0.1 mm.
8 mm. The roller 31 was moved so that the number of drops was 60 drops / min, and the drop test was performed for 30 minutes. The results are shown in FIG.

From the above, it can be seen that the roller clamp according to the embodiment of the present invention has less variation in flow rate due to a change with time during infusion and is excellent as a roller clamp as compared with the roller clamp of the comparative example.

[0028]

By using the roller clamp of the present invention in an apparatus for continuously injecting blood, drug solution, etc. into a patient,
A liquid such as blood or a drug solution can be supplied for a long time at a substantially constant injection rate.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a roller clamp according to the present invention.

FIG. 2 is a cross-sectional view in the width direction showing an example of the roller clamp of the present invention.

FIG. 3 is a cross-sectional view in the width direction of a conventional roller clamp.

FIG. 4 is an explanatory diagram of a drip set.

FIG. 5 is a graph showing a change over time in a flow rate change rate in an infusion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller 2 Plastic tube 3 Guide groove 4 Support shaft of roller 5 Bottom plate 6 V groove 7 Inner wall of plastic tube 8 Ridge 9 Side 17 Side wall

Claims (1)

(57) [Claims] 1. A bottom plate extending vertically in which a plastic tube is placed, a pair of left and right side walls erected from both corners of the bottom plate, and a guide groove provided in the side wall between the guide grooves. A roller having left and right support shafts that move slidably and that presses a plastic tube placed on the surface of the bottom plate; and a roller that adjusts a flow rate of a liquid passing through the plastic tube. In the clamp,
A pair of upper surfaces provided at least at positions higher than the thickness of the pressed and flat plastic tube of the pair of left and right side walls erected from both corners of the bottom plate have curved or planar protrusions. Shaped portion is formed, the pair of
A roller clamp, wherein the distance between the protruding portions is substantially equal to the roller width, and guides correction of inclination in the roller width direction due to eccentricity of the roller support shaft.