JPS5822224B2 - Kremme - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION For example, when performing an intravenous drip, the present invention is installed in the middle of a fluid delivery tube connected to a blood transfusion bag or a drug solution bag, and utilizes the flexibility of the fluid delivery tube to move the fluid delivery tube. This invention relates to a drainer that adjusts the flow rate by pressing.

Conventionally, there are two types of clamps of this kind: screw clamps and roller clamps.

Screw clamps are used to partially suppress and adjust the liquid supply pipe by moving the bolt forward and backward, and therefore cannot be operated with one hand, making it impractical and therefore only used in special locations.

On the other hand, the roller clamp has a structure as shown in FIGS. 1 and 2, in which a liquid feed pipe 5 is passed between the inner surface 2 of the housing 1 and the circumferential surface 4 of the manual roller 3, and the manual roller 3 is By moving the manual roller 3 closer to or away from the inner surface 2 of the housing 1, the amount of squeezing of the liquid feeding tube 5 is changed and the amount of liquid fed is adjusted.

Therefore, since it is only necessary to move the manual roller 3, it can be easily operated with one hand, making it a convenient device that is indispensable when relatively adjusting the amount of liquid fed in multiple liquid feeding pipes. It is widely used as a narirenfu.

However, as is clear from FIG. 2, in the conventional roller clamp, the liquid feed pipe 5 is sandwiched between the flat circumferential surface 4 of the manual roller 3 and the flat inner surface 2 of the housing 1, which is also flat. Since the liquid feeding tube 5 is pressed and deformed by point contact, even if the liquid feeding tube 5 is deformed, the liquid feeding tube 5
The deformed shape is not uniquely determined, and the deformed state becomes unstable.

However, even if the position of the manual roller 3 is determined, it changes successively over time, causing a wide change in the flow rate.

This experimental example is shown in Figure 3.
As shown by the curve, the flow rate decreases by 50 to 60 fy.

Therefore, when using the system, it is necessary to adjust the flow rate while considering the decrease in flow rate while taking into consideration the time margin.

Moreover, even after the deformation state is almost completely determined and the flow rate is stabilized, it must be kept quiet.

That is, if even a slight shock is applied, there is a great risk that the deformation state of the liquid feeding pipe 5 will change again and the flow rate will change.

Note that it is particularly dangerous if the flow rate increases due to external factors such as post-adjustment shock.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a roller clamp that has good followability in flow rate adjustment and is capable of stably adjusting the flow rate.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 9.

11 in FIG. 4 is the housing of the roller cremme,
This is made of hard synthetic resin and has a substantially rectangular parallelepiped shape when viewed as a whole.

This housing 11 has groove-shaped spaces 12 formed at equal widths along its longitudinal direction.

The bottom of this space 12 is a groove-shaped insertion passage 14 having a curved surface having a U-shaped cross section and a curved surface having a semicircular cross section for accommodating and guiding a liquid feeding gap 13 to be described later.

That is, the bottom of the space 12 forms a groove having a U-shaped cross section as a whole.

Further, a manual roller 17 is mounted in the space 12 so as to be movable along the center of the insertion path 14.

That is, the inner surfaces of both side walls 16, 16 of the space 12 have bearing grooves 1 into which the shafts 18, 18 of the manual roller 17 are inserted and guided.
9 and 19 are formed to guide the manual roller 11.

At this time, the bearing groove 19.19 is not parallel to the insertion passage 14, but is inclined at an angle θ as shown in FIG.

Therefore, the distance that the peripheral surface of the manual roller 17 has with respect to the insertion portion 14 differs depending on the position of the manual roller 17.

On the other hand, the thickness of the manual roller 17 is smaller than the width of the space 12.

However, spacers 20.2 on each of said shafts 18.18
0 prevents movement in the axial direction, and the bearing groove 1
It is configured so that it can only move along 9.19.

Furthermore, the peripheral portion of the manual roller 17 always faces the center of the insertion passage 14, as shown in FIG.

When the manual roller 17 is moved, its peripheral portion comes into rolling contact with the liquid feeding tube 13 of the insertion passage 14, and crushes the upper half of the liquid feeding tube 13 according to the spacing.

The peripheral part of the manual roller 17 has a flat central part and chamfered edges on both sides, and a knurling 23 protruding from the central flat peripheral part 21.
is formed.

Therefore, the knurling 23 and the chamfered portions 24 and 24 at both ends
A stepped portion 25.25 is formed between the two.

A portion of the circumferential portion of the manual roller 17 protrudes from the space 12 to the outside of the housing 11, so that the protruding circumferential portion can be operated with a finger.

Next, to give specific dimensional relationships, the outer diameter r1 of the liquid feeding tube 13 is 3.3±0, and the wall thickness t is 0.4±0.
When 1 m 1 tt, the outer diameter of the liquid pipe 13 is rl, and the insertion passage 1 is
The radius of curvature of the curved surface of No. 4 is r2, and each r0. Taking the ratio of r2, it becomes rl:r2 = i, o~1.2: 1.0~1.6, and generally, once the outer diameter r of the liquid feeding pipe 13 is determined, the dimensions of each part are also determined.

For example, the thickness of the roller 17 is 0.75 to 0.8 of r2.
About 5 times is desirable.

The inclination angle θ of the insertion passage 14 with respect to the moving direction of the manual roller 17 is generally 0°, and θ<1o0.

When operating the roller clamp having the above structure, first move the manual roller 17 toward one end of the insertion path 14, that is, the position where the gap is the largest, position A in FIG. Insert the liquid pipe 13.

At this time of attachment, since the above-mentioned interval is larger than the outer diameter of the liquid feeding tube 13, the liquid feeding tube 13 is not crushed.

Therefore, there is no flow restriction at this point.

Further, since the insertion passage 14 is formed in the shape of a groove having a curved surface with a U-shaped cross section, the liquid feeding tube 13 is necessarily accommodated along the center of the insertion passage 14.

Therefore, when the manual roller 17 is rotated with a finger, the manual roller 17 rolls while touching the upper half circumferential surface of the liquid feeding tube 13 and moves to the center along the bearing groove 19.

As a result, the circumferential portion of the manual roller 17 gradually enters into the insertion passage 14, so that the circumferential portion of the manual roller 17 presses in while broadly touching the upper center portion of the liquid feeding pipe 13, as shown in FIG.

At this time, as shown in FIG. 6, the upper half of the liquid feeding tube 13 completely contacts the flat peripheral surface 21 thereof.

Furthermore, when the amount of movement of the manual roller 17 is increased, the circumferential part of the manual roller 17 pushes the center part of the upper half of the liquid feeding tube 13 further, and the cross section of the liquid feeding tube 13 as shown in FIG. The shape is made into a so-called flat crescent shape, and the liquid sending pipe 1
3. Reduce the cross-sectional area as a flow path.

At this time, as is clear from FIG. 7, not only does the upper half of the liquid pipe 13 completely contact the flat circumferential surface part 18, but also the stepped portions 25, 25 at both ends of the flat circumferential surface part 18 and the chamfered portions at both ends. 24. It also closely adheres to 24.

In this manner, by fully contacting and closely contacting the circumferential portion of the manual roller 17, no deviation of the upper half of the liquid feeding tube 13 in the circumferential direction and in the longitudinal direction of the liquid feeding tube 13 occurs.

Further, a knurl 2 protruding from the circumference of the manual roller 17 is provided.
3, this knurl 23 forms the liquid feed pipe 1.
3 also prevents displacement of the liquid feeding tube 13 in the longitudinal direction.

Furthermore, since the lower half of the liquid feeding tube 13 is in close contact with the curved surface of the insertion passage 14, the frictional force is large and slipping does not occur here either.

Then, before the liquid feeding tube 13 is crushed as described above,
The parts where the creep phenomenon is most likely to occur due to the material properties are the edges 26 on both sides of the liquid feed pipe 13, which are most susceptible to deformation.
It is 26.

However, the upper half of the liquid feeding pipe 13 is located around the manual roller 17.

On the other hand, since they are in close contact with each other and both side portions are bitten into the step portions 25, 25, there is no clearance in the circumferential direction in the upper half.

Further, as described above, since the lower half is tightly adhered along the entire inner surface of the insertion passage 14, there is no escape in the circumferential direction (one direction of force perpendicular to the longitudinal direction).

Therefore, once the position of the manual roller 17 is determined, a stable shape of the flow path is immediately obtained, and the shape is reliably maintained and does not change even if some impact is applied.

Therefore, by moving the manual roller 17, a stable flow path is successively established, and the so-called aging phenomenon in which the flow rate continues to change even when the manual roller 17 is stopped can be suppressed to a negligible level.

Incidentally, when the manual roller 17 reaches the position C in FIG. 5, the flow path of the liquid feeding pipe 13 is completely closed and in a cut-off state as shown in FIG. 8.

At this time, the center of the upper half of the liquid feeding tube 13 closely contacts the lower half to form a closed state, while the center of the upper half curves downward.

Therefore, the central part of the upper half is the manual roller 17
A space portion 27 is formed apart from the flat peripheral surface portion 21 of.

However, the stepped portion 25° 25 and the chamfered portions 24 at both ends,
24 and is strongly joined, sufficient holding force is obtained. Therefore, the stress on both side edges 26 and 26 of the liquid feeding tube 13 is reduced to the center of the upper half of the liquid feeding tube 13. It doesn't get across.

Therefore, even if the space 27 is formed, its deformed state is stable.

As explained above, according to the present invention, when the manual roller 17 is moved, a flow path with little change over time is formed at each position, and the state is reliably maintained even when normal shock is applied. It never changes.

Therefore, by determining the position of the manual roller 17, the flow rate is immediately determined and the followability is good.

This is an extremely important effect in this type of cleanser, where it is rather common to mainly adjust the flow rate in a small flow range.

Furthermore, since the present invention is provided with a spacer on each of the left and right shafts of the manual roller, which touches the inner surface of the groove-shaped insertion passage and prevents its movement in the axial direction, various special effects are achieved as described below. It is.

First, when the liquid feeding tube is pressed by the manual roller, the opening of the insertion passage in the housing tends to become narrow, but this can be prevented by the spacer and the width of the insertion passage can be ensured.

Second, the direction of movement of the manual roller is fixed and there is no possibility of it wobbling left or right.

In other words, the manual roller can be moved straight.

Thirdly, since the spacer is in sliding contact with the inner surface of the insertion passage, frictional force is generated and the manual roller can be reliably stopped at each position, making it possible to stably maintain the flow rate adjustment state.

And, by each of these effects, accurate and stable flow rate regulation can be better achieved.

FIG. 9 is an example of experimental results when the number of infusions is controlled by the strainer of the present invention, and shows the change over time in the number of infusions.

In other words, curve 3 shows that when the initial number of drops was adjusted to 64 drops/min, the number of drops after 70 minutes decreased by a factor of 6.3 compared to the initial number. This shows that after 70 minutes after setting the number of drops/min to 42 drops/min, there was a decrease by a factor of 4.8.

As can be seen from this result, the change over time is within a negligible range compared to the conventional one.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional roller clamp, Fig. 2 is a cross-sectional view of the conventional roller clamp, Fig. 3 is a state diagram showing transient phenomena during flow rate adjustment by the conventional roller clamp, and Fig. 4 is a 5 is a front sectional view of the embodiment, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. A sectional view along the line ■-■ in the figure, Figure 8 is ■ in Figure 5.
A cross-sectional view taken along the line -■, and FIG. 9 is a graph showing the experimental results of the present invention. 11...Housing, 13...Liquid feeding pipe, 14...
Insertion path, 17... Manual roller, 21... Flat peripheral surface portion, 23... Knurling, 24... Chamfered portion, 25...
・Danbe.

Claims (1)

[Scope of Claims] 1. A housing having a groove-shaped insertion passage having a curved surface with a U-shaped cross section for accommodating and guiding a liquid feeding tube, and a housing that moves along the center of the insertion passage with respect to the housing. With,
When moving toward one end of the housing, the housing is movably mounted so as to gradually approach the step bottom surface of the insertion passage, and both edges of the peripheral part are chamfered, and the central peripheral part is formed flat, and the flat part is A manual roller has a protruding knurling on its circumferential surface to form a step between the knurling part and the chamfered parts at both ends, and the manual roller has a groove-shaped insertion passage on each axis of the manual roller. a spacer for preventing movement in the axial direction, the wall thickness of the liquid feeding tube is 0.4±0.1 mm, the outer diameter of the liquid feeding tube is rl, and the radius of curvature of the curved surface of the insertion passage is When r2, rl: r2 =1.0~1.2: 1.0~1.6
Further, by setting the inclination angle θ of the insertion passage with respect to the moving direction of the manual roller to 0°〈θ〈10°, when the manual roller is moved by the insertion passage and the circumference of the manual roller, the insertion passage A cleanser characterized in that the flow rate is adjusted by crushing the liquid feeding pipe as appropriate.