JPH06109147A - Roller clamp - Google Patents

Abstract

PURPOSE:To provide a roller clamp which can immediately cope with the change of the position of the roller of the roller clamp and can instill at a fixed instillation speed for a long time. CONSTITUTION:A plastic tube 12 inserted between a roller 11 and the flat plate-like bottom plate of a groove is fixed by protruded rows 8a and 8b wherein the top is curved or flat pushed and pressed by the roller 11. The plastic tube 12 becomes flat at side sections 9a and 9b, and an inner space 7 is squashed at side sections, preventing liquid from passing, but liquid is supplied from an inner space 7 formed between protruded rows 8a and 8b. The flowing out speed of the liquid flowing the plastic tube 12 is determined according to the size of the cross section of the inner space 7.

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 adjusting the flow rate of a liquid through a plastic tube, and more particularly, it is formed at an apex of an extension line extending from the lowest position of a flat groove. By pressing the plastic tube with a roller, the plastic tube is pressed against a bottom plate having a pair of curved upper surfaces or flat projections.
The present invention relates to a roller clamp that can constantly supply a liquid flowing through the inside of a chamber at a constant flow rate.

[0002]

2. Description of the Related Art In a drip set for continuously supplying a medical solution such as Ringer's solution or amino acid solution or blood to a patient,
The roller clamp provided in the middle of the liquid guiding tube is capable of adjusting the liquid supply amount to the patient and is therefore widely used in general.

FIG. 7 is an explanatory view of a drip setting device, in which a liquid medicine is put in a glass bottle 20 and an injection needle 24 is pierced straight into a 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,
Roller closes completely. Next, the glass bottle 20 is hung upside down, and the drip tube 26 is crushed by a finger and released to fill the drug solution into the drip tube 26 up to about half. Then roller clamp
Loosen the roller position of 27, let the medicinal solution flow out from the venous needle 28,
Remove all air from the tube and close the roller again.

Thereafter, the ventilation needle 23 is pierced into the rubber stopper, and the vein needle 28 is fixed at a predetermined position below the water surface of the glass bottle 20,
While gradually loosening the roller of the roller clamp 27, a predetermined number of drip is determined and a drug solution is injected into the patient. As such a roller clamp, a plastic tube inserted into an elongated hollow box is pressed by a movable roller to deform the inner cavity of the tube so that the liquid passing through the tube is prevented. A device for adjusting the flow rate is disclosed in JP-A-47-1540 and JP-B-46.
-36526 publication. The roller clamp disclosed in Japanese Unexamined Patent Publication No. 47-1540 is a roller clamp in which shelf-like projection surfaces 55 are formed on both left and right ends of a flat plate groove 57 shown in FIG.
The plastic tube 53 is pressed by 51 and its cross section is deformed so that the liquid passes through the inner cavity 53 formed in the central portion of the flat plate groove 57. In addition, Japanese Examined Japanese Patent Publication 46-36526
As an improved patent of the publication, a roller having a structure in which the cross section of the bottom plate of the elongated hollow box in the width direction is the structure shown in FIG.
The clamp is introduced in Japanese Patent Publication No. 60-27870.

FIG. 4 shows a roll in which a plurality of raised portions 13 separated by a plurality of separation valley portions 15 are formed on the left and right side portions of the V groove 14.
The plastic tube 22 is pressed by the roller 21 and its cross section is deformed, and both ends of the tube 22 are fixed by a plurality of concave and convex portions on the side and formed at the center of the V groove 14. It has a structure in which the liquid passes through the inside of the formed lumen 16.

However, when these roller clamps are incorporated into a drip set to drip a drug solution, the number of drip drops as time passes, and a constant amount of liquid is not always supplied at a predetermined rate. I found out that

The present inventor has conducted various studies in order to improve such drawbacks, and brings the pair of ridges as close as possible to the V groove, and gradually reduces the thickness of the bottom plate from the ridges to the left and right side walls. It has been found that the supply speed of the chemical solution is stable, and the cross section of the bottom plate in the width direction as shown in the cross section of the roller clamp in FIG.
We invented a roller clamp in which a pair of ridges 39a and 39b having vertices on the extension line extending from 38 to the left and right sides are formed, and a patent application has already been filed (Japanese Patent Application No. 2-2287).
No. 84).

[0008]

In this roller clamp, the pair of ridges located near the V groove of the bottom plate presses the plastic tube to fix the tube inner cavity. Although the problem that the infusion rate changes was slightly improved, the rate of change in the flow rate was still large when the drug solution was infused into the human body for a long period of time, and it was possible to inject it into the human body at a constant infusion rate during long-term infusion. There has been a demand for the development of Lachlan.

The present invention has been made in order to meet such a demand, and an object of the present invention is to provide a roller clamp roller.
(EN) It is possible to provide a roller clamp which can immediately respond to a change in the position of a roller and can drip at a constant drip rate for a long time.

[0010]

That is, the present invention provides a vertically extending bottom plate on which a plastic tube is placed, and guides provided on a pair of left and right side walls standing upright from both corners of the bottom plate. A groove and a roller having left and right support shafts slidably moving across the guide grooves and pressing a plastic tube placed on the surface of the bottom plate. In a roller clamp for adjusting the flow rate of a liquid passing through a plastic tube, the height interval distance between the surface of the bottom plate and the guide groove is continuously variable, and the cross section of the bottom plate in the width direction is flat. And a pair of ridges each having an apex on the extension line extending from the lowest position of the left and right ends of the groove toward the left and right side portions and having a curved surface or a planar shape. The thickness of the bottom plate gradually decreases from the A Rakuranpu - B, wherein Rukoto.

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, and the wall thickness of the bottom plate is gradually increased continuously in the vertical direction. It is a roller clamp.

Further, in the roller clamp according to the present invention, the guide grooves for supporting the left and right supporting shafts of the roller are inclined with respect to the surface of the bottom plate, and the wall thickness of the bottom plate is substantially the same. Is.

Furthermore, the present invention is the roller clamp according to the above roller clamp, wherein the distance between the pair of protrusions is 35 to 70% of the length of the bottom plate in the width direction.

Further, the present invention is the roller clamp according to the above-mentioned roller clamp, wherein the height interval between the bottom plate of the flat groove and the highest position of the ridge is 1.1 to 2.0 times the wall thickness of the plastic tube. is there.

[0015]

Since the present invention has such a configuration,
Insert the plastic tube inserted in the roller clamp into
By sliding the support shaft of the roller along the guide groove, the plastic tube is pressed by the roller, and the pair of upper surfaces provided on the extension lines at both ends of the flat plate-shaped groove are curved or flat. It is fixed by the ridge part that did. The ridge portion approaches the flat groove as much as possible, and the wall thickness of the bottom plate gradually decreases from the ridge portion to the left and right side walls, so that the tube resistance is small and the inner diameter of the plastic tube is small. Since the deformation is small, the liquid can be supplied from the lumen at a constant rate while maintaining the deformed state of the lumen.

[0016]

EXAMPLES An example of the present invention will be described below with reference to examples.

FIG. 1 is a perspective view showing an example of a roller clamp of the present invention, and FIG. 2 is an example of a roller clamp of the present invention. FIG. 3 is a perspective view of a roller clamp showing another embodiment of the present invention, FIG. 4, FIG. 5 and FIG. 6 are sectional views in the width direction of a conventional roller clamp, and FIG. FIG. 8 is an explanatory view of the drip set, and FIG. 8 is a graph showing the change over time in the flow rate change rate in the drip.

In the figure, 1, 11, 21, 31, 41 and 51 are low.
La, 2, 12, 22, 29, 32, 42 and 52 are plastic tubes, 3 and 33 are guide grooves, 4 and 34 are roller spindles, 5 and 35 are bottom plates, and 6 and 57 are flat plates. -Shaped groove, 14 and 37 are V-shaped grooves, 7, 16, 43 and 53 are plastic tubes
Lumen, 8 and 39 are ridges, 9, 45 and 55 are sides, 13 is a ridge, 15 is a separating valley, 17, 44 and 54 are side walls, 20 is a glass bottle, 23 is a vent needle , 24 is an injection needle, 25 is a phototube, 26 is a drip tube, 27 is a roller clamp, and 28 is an intravenous needle.

FIG. 1 is a perspective view of an embodiment of the present invention, in which the left and right support shafts 4 of the roller 1 are slidably movable along a guide groove 3 provided substantially horizontally on the side wall 17. It is supposed to do. The bottom plate 5 has a structure in which the surface is inclined with respect to the guide groove 3, and the wall thickness is gradually increased continuously in the vertical direction. The plastic tube 2 inserted between the roller 1 and the bottom plate 5 is adjusted in the degree of pressing by the roller 1 as the roller 1 moves, so that the lumen of the plastic tube 2 is disconnected. The area is set.

FIG. 2 is a cross-sectional view of the roller clamp of the present invention in the vicinity of the bottom plate 5 in the width direction. The bottom plate 5 has a cross section in the width direction from the lowest positions 10a and 10b at the left and right ends of the flat groove 6. A ridge 8 having a pair of upper surfaces curved or flat at the apex on the extension line extending in the direction of the portions 9a and 9b.
Sides 9a where a and 8b are formed and the thickness of the bottom plate gradually decreases from the ribs 8a and 8b toward the side wall 17
And 9b are formed. And roller
The plastic tube 12 inserted between the base plate 11 and the bottom plate 5 is pressed by the roller 11 and fixed by the projecting ridges 8a and 8b whose upper surfaces are curved or flat, and both ends thereof are side portions 9a.
And 9b are flattened, the lumen is in close contact and liquid does not pass,
The liquid is supplied from the inner cavity 7 formed slightly between the ridges 8a and 8b. The size of the cross-sectional area of the inner cavity 7 determines the outflow rate of the liquid flowing in the plastic tube.

The flat plate-shaped groove 6 is a groove having a flat bottom surface. Minimum position 10a and 10 on both left and right sides
The ridge portions 8a and 8b are formed at the highest positions extending from b toward the side portions 9a and 9b. The angle α formed by the bottom surface and the slanted lines toward the protrusions 8a and 8b at the positions 10a and 10b is an obtuse angle of 95 to 150 degrees, preferably 105 to 130 degrees.

On the other hand, the ridges 8a and 8b preferably have substantially the same shape, and the upper surfaces thereof do not project at an acute angle, but have a curved or planar shape. It is preferable that both corners of the upper surface of the protrusion having a flat upper surface have a curved structure. Plastic tube 12 is roller 11
Is pressed by the ridges 8a and 8b whose upper surface has a curved or plane shape, and is fixed by the plastic tube.
The drug solution flows out while keeping the cross-sectional area of the 12 lumens 7 constant.

The height H between the highest position of the ridges 8a and 8b and the flat bottom surface is the wall thickness T of the plastic tube.
1.1 to 2.5 times, preferably 1.3 to 2.0 times. If the height H is less than 1.1 times the wall thickness T, the plastic tube
The lumen 7 of the tube tends to come into close contact, making it difficult to control the flow rate of the drug solution, and if it exceeds 2.5 times, the deformation of the lumen 7 of the plastic tube tends to be large and the tube resistance tends to increase.

FIG. 3 is a perspective view showing another embodiment of the present invention, in which a bottom plate 35 is provided on a pair of left and right side walls 36 standing upright from both corners of an elongated bottom plate 35 having substantially the same wall thickness. The support shaft 34 of the roller 31 is supported by the guide groove 33 inclined with respect to the guide groove 33,
By moving the guide groove 33 slidably, the plastic tube 32 inserted between the bottom plate 35 and the roller 31 is pressed, and the flow rate of the liquid passing through the inner cavity of the plastic tube 32. Is adjusted.

In the roller clamp shown in FIG. 3, the wall thickness of the bottom plate 35 is substantially the same. The ratio of the distance d between the ridges 8 and 8b shown in FIG. 2 to the widthwise length D of the bottom plate is preferably 35 to 70%. If the ratio is less than 35%, the side tube 9 will be sufficiently rolled to cover the plastic tube 12.
It is difficult to press at 11, and the sealing of the lumen 7 tends to loosen.
If it exceeds%, it tends to be difficult to control the flow rate of a small amount of liquid.

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

Example 1 In FIG. 1, a roller 1 made of ABS resin (diameter 15.0 mm)
Using a roller clamp made of polypropylene with the support shaft 4 fitted in the guide groove 3, an outer diameter of 3.80 mm and an inner diameter of 2.64 m
Polyvinyl chloride with m and wall thickness of 0.58 mm (TN-9281 manufactured by Riken Chemical Industry Co., Ltd.
The tube (M) was inserted, the roller 1 was moved so that the rate was 60 drops / minute, and the drip test was carried out for 30 minutes using the drip set device shown in FIG. The results of this test are shown in FIG. 8 as a flow rate change rate.

The bottom plate of this roller clamp has an angle α of 114 ° in FIG. 2, the height of the ridges 8a and 8b is 0.15 mm, the width is 0.5 mm, and the upper surface has a curvature of 0.2 mm. And a structure having a height H of 0.8 mm was used.

The drip test uses the drip set of FIG. 7,
The roller position of the roller clamp 27 is set to about 500 mm below the water surface of the glass bottle 20, the vein needle 28 is fixed to about 1000 mm below the water surface of the glass bottle 20, and water is put into the glass bottle to carry out the usual method. Was set to 60 drops / min. Next, install a photoelectric tube 25 (LX-130R manufactured by Keyence Co., Ltd.) at a position where the drip can be detected in the drip tube 26, and operate the drip number counter (CBM-1320 manufactured by Citizen) to record the drip number for 30 minutes The flow rate change rate was calculated by the following formula.

[0031]

[Equation 1]

Comparative Example 1 The same test as in Example 1 was carried out using a roller clamp having the shape of the roller clamp shown in FIG. 1 and having a sectional shape in the width direction of the roller clamp shown in FIG. In FIG. 4, the height of the raised portion 13 is 0.2 mm, and the angle formed by the V groove 14 at the lowest position is 90 degrees. Then, the roller 21 was moved so that the number of drops was 60 drops / minute, and a drip test was performed for 30 minutes. The results are shown in FIG. 8 as the flow rate change rate.

Comparative Example 2 The same test as in Example 1 was carried out using a roller clamp having the shape of the roller clamp shown in FIG. 1 and having a cross section in the width direction of the roller clamp shown in FIG. In FIG. 5, the height of the ridge 39 is 0.15 mm, the width is 0.5 mm, and the curvature of the upper surface is 0.
The upper surface of 2 mm had a curved surface shape, and the angle formed by the V groove at the lowest position was 78 degrees. The roller 41 was moved so that the drip rate was 60 drops / min, and a drip test was performed for 30 minutes. The results are shown in FIG. 8 as the flow rate change rate.

Comparative Example 3 The same test as in Example 1 was carried out using a roller clamp having the shape of the roller clamp shown in FIG. 1 and having a sectional shape in the width direction of the roller clamp shown in FIG. Flat plate groove in FIG.
The height from the bottom of the 57 to the side 55 is 0.8 mm. The number of drip
The roller 51 was moved so that the rate was 60 drops / minute, and a drip test was performed for 30 minutes. The results are shown in FIG. 8 as the flow rate change rate.

The roller clamp of Example 1 of the present invention is excellent in roller clamp as compared with the roller clamps of Comparative Examples 1 to 3 because the variation due to aging during drip is small.

[0036]

INDUSTRIAL APPLICABILITY By using the roller clamp of the present invention in a device for continuously injecting blood, drug solution or the like into a patient,
A liquid such as blood or a drug solution can be supplied at a substantially constant infusion rate for a long time. Also, load the plastic tube
The time from when the liquid flow is stopped by pressing the roller to when the roller is moved to start the liquid flow is short and the operability is good.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view in a width direction in which an upper surface of a protrusion has a curved shape and shows an example of a roller clamp of the present invention.

FIG. 3 is a perspective view of a roller clamp showing another embodiment of the present invention.

FIG. 4 is a widthwise sectional view of a conventional roller clamp.

FIG. 5 is a cross-sectional view of a conventional roller clamp in the width direction.

FIG. 6 is a widthwise sectional view of a conventional roller clamp.

FIG. 7 is an explanatory diagram of a drip set.

FIG. 8 is a graph showing a change with time of a flow rate change rate in infusion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller 2 Plastic tube 3 Guide groove 4 Roller spindle 5 Bottom plate 6 Flat plate groove 7 Plastic tube inner cavity 8 Ridge portion 9 Side portion 17 Side wall

Claims (5)

[Claims] 1. A vertically extending bottom plate on which a plastic tube is placed, guide grooves provided on a pair of left and right side walls standing upright from both corners of the bottom plate, and straddling between the guide grooves. Roller having left and right support shafts slidably moving, and pressing a plastic tube placed on the surface of the bottom plate,
In a roller clamp for adjusting a flow rate of a liquid passing through a plastic tube constituted by, a distance between heights of a surface of the bottom plate and the guide groove is continuously variable, and a width direction of the bottom plate. Has a flat-shaped groove and a ridge having a pair of upper surfaces with a curved or flat shape having vertices on the extension lines extending from the lowest positions of the left and right ends of the groove toward the left and right sides. A roller clamp characterized in that the thickness of the bottom plate is gradually reduced from the ridge portion toward the left and right side walls. 2. The roller according to claim 1, wherein the guide grooves for supporting the left and right support shafts of the roller are at substantially the same height, and the wall thickness of the bottom plate is continuously thickened in the vertical direction. -Laclan. 3. The roller clamp according to claim 1, wherein the guide grooves for supporting the left and right support shafts of the roller are inclined with respect to the surface of the bottom plate, and the wall thickness of the bottom plate is substantially the same. 4. The roll according to claim 1, wherein the distance between the pair of protrusions is 35 to 70% of the length of the bottom plate in the width direction.
Lachlan. 5. The height interval between the bottom plate of the plate-like groove and the highest position of the ridge is 1.1 to 2.5 of the wall thickness of the plastic tube.
Roller clamp according to claims 1 to 4, which is doubled.