JPH052194Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flow rate regulator that regulates the flow of liquids such as medicinal solutions and blood.

[Conventional technology]

BACKGROUND ART In infusion sets, blood transfusion sets, and other medical instruments, it is necessary to adjust the flow rate of a drug solution, blood, or the like flowing inside a tube. It is well known that flow rate regulators are installed in the middle of these tubes for this purpose.

Various types of flow rate regulators have been known in the past, and a typical example is a roll clamp. This roll clamp generally consists of a main body and a roll movably attached to the main body, and a tube is sandwiched between the peripheral surface of the roll and the moderately inclined bottom of the main body. By moving the rolls, the cross-sectional area of the tube was changed to adjust the flow rate of the liquid.

Furthermore, in addition to the method of adjusting the flow rate by sandwiching a tube, there is also a flow rate regulator that adjusts the flow rate by changing the cross-sectional area of the flow path by combining two or more hard members. Publication, JP-A-57
Many proposals have been made, such as in Publication No. 203451 and Japanese Patent Application Laid-open No. 149161/1983.

[Problem that the invention attempts to solve]

However, with this roll clamp, since the tube is made of flexible plastic, there is a problem in that the cross-sectional area of the pressed tube changes over time due to its characteristics, and the flow rate also changes accordingly. For this reason, several improvements have been attempted, such as those in which the bottom surface of the main body is rounded or grooves are formed in the length direction of the bottom surface of the main body.

However, these methods share the same basic principle of sandwiching a softened plastic tube, and it is inevitable that the flow rate will fluctuate depending on the characteristics of the plastic.

Further, in order to eliminate such drawbacks, many flow rate regulators have been proposed that adjust the flow rate by changing the cross-sectional area of the flow path by combining hard members, but all of them have had problems in terms of cost.

The purpose of this invention is to solve the above-mentioned problems of conventional flow rate regulators.

[Means for solving problems]

In order to achieve this purpose, this invention has the following structure. That is, the flow rate regulator according to this invention is composed of a cylindrical member A whose upper end is connected to a liquid introduction part and whose lower end is open, and a cylindrical member B whose upper end is closed. Member B is inserted, and the inner circumferential surface of A and the outer circumferential surface of B are rotatably fitted, and the side surface of member A has a width that is maximum at the lower end and gradually narrows as it goes upward. A notch is provided, and the notch extends above the upper end of B when members A and B are fitted to form a first opening; By providing a slit parallel to the axial direction of B within the range and further installing members A and B in the housing, the liquid introduction part, the inside of member A, the first opening, the housing and the member forming a flow path consisting of a space surrounded by A and B, a second opening formed by overlapping the cut and the slit, and the inside of member B;
It is characterized in that the flow rate is adjusted by rotating members A and B with respect to each other and adjusting the opening area of the second opening.

[Effect]

The liquid introduced into one cylindrical member A passes through the notch provided in the cylindrical member A and the part that does not overlap with the other cylindrical member B, and accumulates in the housing 4, and then accumulates in the housing 4. It flows out into the cylindrical member B through the overlapping portion of the notch and the slit of the cylindrical member B.

The flow rate is adjusted by rotating the cylindrical member A or B to change the opening area of the portion where the slit and the notch overlap.

〔Example〕

An embodiment of this invention will be described with reference to the drawings.

FIG. 1 is a sectional view of the flow rate regulator of the present invention, and FIG. 2 is a perspective view of the main parts.

One cylindrical member A has the other cylindrical member B.
A notch 11 is formed that is widest on the side where the cylindrical member A is inserted and gradually narrows toward the opposite side. It extends above the upper end of B and forms a first opening 2. The upper end of the cylindrical member B is closed, and a slit 3 is provided in parallel to the axial direction of the cylindrical member B and within the fitting range of the members A and B. Members A and B are rotatably fitted into each other. In addition, the protrusion 9 provided on the housing on the cylindrical member A side is engaged with the groove 10 provided on the housing on the cylindrical member B side to prevent the cylindrical member B from coming out of the cylindrical member A. The respective positional relationships (in the vertical direction in FIG. 1) are determined. Further, the fitting portion between the cylindrical member A and the cylindrical member B is tightly controlled in size to form a watertight structure. Furthermore, if one material is relatively soft such as polyethylene resin and the other material is relatively hard such as polystyrene resin, a watertight structure can be more easily achieved.

Further, in the embodiment of the present invention, the cylindrical member A
The tip on the side is a needle tip, which is inserted into a medicine bottle or the like (not shown). At this time, the medicinal solution flows through the introduction pipe 1, and external air flows into the bottle through the air introduction hole 8. Preferably, a filter (not shown) is provided in this air introduction hole to purify the air.

Next, an example of the use of the above-described embodiment will be described. First, a liquid such as a chemical solution flows into the cylindrical upper member A from the introduction pipe 1 and flows out into the housing 4 through the slit 2. Thereafter, when the level of the liquid accumulated in the housing 4 rises to the position of the slit 3, the liquid flows through the slit 3 into the outlet pipe 5 through the inside of the cylindrical member B, and further flows into the housing 12.
It will be leaked to. This outflow amount is from slit 3.
and a curved cut 1 provided in the cylindrical upper member A.
It depends on the opening area formed by the slit 1, that is, the overlapping portion of the slit 3 and the cut 11. Therefore, by rotating the grip 6 connected to the cylindrical member B and changing the opening area, the flow rate can be adjusted. Of course, it is also possible to stop the liquid from flowing out by moving the rotational position of the grip. Furthermore, the grip portion 6 of the cylindrical member B and the housing 12 are also rotatable with respect to each other.
Moreover, the structure is such that the respective positional relationships (in the vertical direction in FIG. 1) are determined.

Curved cut 1 provided in cylindrical member A
1 and the size of the slit 3 provided in the cylindrical member B are arbitrarily selected so as to obtain a desired flow rate.

[Effect of idea]

According to the flow rate regulator of this invention, unlike conventional roll clamps, the flow rate of liquid is not controlled by sandwiching a tube, but rather the flow path is controlled by the mutual rotational position of two cylindrical members. Since the flow rate of liquid from the housing is directly controlled by changing the opening area of the housing, the flow rate of infusions, etc. can be maintained with high precision from beginning to end, eliminating the need for repeated readjustments midway through the process as in the past.

Furthermore, compared to conventional flow rate regulators in which two or more hard members are combined to change the cross-sectional area of a flow path, the number of component parts can be reduced, and it can be manufactured at low cost.

[Brief description of the drawings]

Fig. 1...A sectional view showing an embodiment of the present invention, Fig. 2
Figure: A perspective view showing the main parts of FIG. 1. DESCRIPTION OF SYMBOLS 1...Introduction pipe, 2...First opening, 3...Slit, 4...Housing, 5...Outlet pipe, 6...
...Grip, 9...Protrusion, 10...Groove, 11...Notch, A...Cylindrical member, B...Cylindrical member.

Claims (1)

[Scope of utility model registration request] A flow rate regulator for regulating the flow of liquids such as infusions and medicinal solutions is composed of a cylindrical member A whose upper end is connected to the liquid introduction part 1 and whose lower end is open, and a cylindrical member B whose upper end is closed. The member B is inserted into the inside of the member A, and the inner circumferential surface of A and the outer circumferential surface of B are rotatably fitted, and the side surface of member A has a width that is maximum at the lower end and extends upward. A cut 11 is provided so that the width gradually becomes narrower,
The notch extends above the upper end of B when members A and B are fitted to form a first opening 2, and furthermore, member B has a slit 3 within the fitting range with member A. are provided in parallel to the axial direction of B, and members A and B are further installed in the housing, so that the liquid introduction part 1, the inside of member A, the first opening, the housing and members A and B are , a second opening formed by the overlapping of the cut 11 and the slit 3, and the inside of the member B, and rotate the members A and B mutually to form a flow path. 1. A flow rate regulator, characterized in that the flow rate is adjusted by adjusting the opening area of the second opening.