JPH052196Y2 - - 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.

[The problem that the idea 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 to solve the problem]

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 cylindrical members A and B, and one cylindrical member A has a space inside, and one end of the space is open and the other end is open to the space. The other cylindrical member B has a liquid introduction part that communicates with it, and the other cylindrical member B has a liquid outlet part at one end and a cylindrical part formed in the center, and the cylindrical part has a liquid passage inside and one end of the cylindrical member B. communicates with the liquid outlet part and is closed at the other end, and a slit is provided on the side surface of the cylindrical part that communicates with the liquid passage. When the cylindrical part of member B is inserted, both members are rotatably fitted to each other, and the internal space of cylindrical member A is the same as the circumference of the side surface of the cylindrical part when the cylindrical part of cylindrical member B is inserted. By rotating the cylindrical members A and B relative to each other, the slit provided in the columnar part of the cylindrical member B can be opened. It is characterized in that the flow rate is adjusted by changing the positional relationship with respect to the gap formed around the cylindrical part.

[Operation] The liquid introduced into one cylindrical member A from the liquid introduction part flows into the space inside the member and reaches the gap formed between it and the cylindrical member B, and the flow rate is reduced by the gap. After being regulated, the liquid flows out from the slit provided in the cylindrical member B to the liquid passage and the liquid outlet.

When cylindrical member A and cylindrical member B are rotated relative to each other, the positional relationship between the slit and the gap changes, which changes the size of the gap that regulates the flow of the liquid, making it possible to adjust the flow rate. become.

〔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 sectional view taken along the line a-a in FIG.

One cylindrical member A has a space 8 therein, one end of the space is open, and the other end is provided with a liquid introduction part 4 communicating with the space. The other cylindrical member B has a cylindrical portion formed in the center on the side to be fitted into the cylindrical member A, and a liquid passage is provided inside the cylindrical portion. One end of this liquid passage is closed and the other end communicates with the liquid outlet part 5.
A slit 1 communicating with the liquid passage is provided on the side surface of the cylindrical member parallel to the axial direction of the cylindrical member B. The columnar part of the cylindrical member B is inserted into the space 8 of the cylindrical member A, and both members are rotatably fitted into each other.

Furthermore, in this embodiment, the circumferential protrusion 6 provided on the inner circumference of the cylindrical member B is inserted into the circumferential groove 7 provided on the outer circumference of the cylindrical member A, so that the cylindrical member B becomes cylindrical. This prevents them from slipping out of the shaped member A, and fixes their respective positional relationships (in the left-right direction in FIG. 1). The engagement portion between the cylindrical member A and the cylindrical member B or the outer peripheral surface of the cylindrical member A and the inner peripheral surface of the cylindrical member B have a watertight structure.
Note that the method of positioning in the left and right direction in FIG. 1 is not limited to this embodiment.

The shape of the space 8 of the cylindrical member A is such that the gap 2 gradually becomes larger along the circumference of the side surface of the cylindrical member B when the cylindrical part of the cylindrical member B is inserted. There is. That is, as shown in FIG. 2, the space is cylindrical and has a shape whose radius gradually increases in the circumferential direction. Further, in case the flow is stopped, it is preferable to create a portion where the gap 2 disappears, as shown in FIG. If you want to increase the maximum flow rate,
The purpose is achieved by forming the enlarged space 3 larger than the maximum part of the gap 2.

Next, the flow of liquid when using the flow rate regulator of the above-described embodiment will be explained. First, a liquid such as a medicinal liquid flows from the liquid introduction part 4 into the space 8 of the cylindrical member A. After reaching gap 2, cylindrical member B
The liquid flows out from the slit 1 through the liquid outlet 5 through the liquid passage inside the cylindrical part. This outflow amount depends on the size of the gap 2 from the introduction part 4 to the slit 1, but it depends on the size of the gap 2 between the cylindrical member A and the cylindrical member B.
By mutually rotating the slit 1
Since the positional relationship between the gap 2 and the gap 2 changes, and the size of the gap where the slit is located changes, the flow rate can be adjusted. As described above, it is convenient to provide a region where no gaps are formed, since this can stop the liquid from flowing out. In addition, in order to suppress the rotation of both cylindrical members A and B within one rotation, a stopper (not shown) may be provided to restrict the rotation.

Note that the sizes of the gap 2 and the slit 1 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 that combine two or more hard members to change the cross-sectional area of the flow path, the number of component parts is small and manufacturing is easy, so it can be manufactured at low cost. .

[Brief explanation of drawings]

Fig. 1...A sectional view showing an embodiment of the present invention, Fig. 2
Figure: sectional view taken along line a-a in FIG. 1. 1...Slit, 2...Gap, 3...Enlarged space part, 4...Introduction part, 5...Leading part, 6...Circumferential projection, 7...Circumferential groove, 8...Space part, A ...Cylindrical member, B...Cylindrical member.

Claims (1)

[Scope of utility model registration request] This is a flow rate regulator for regulating the flow of liquids such as medicinal solutions and blood, and is composed of cylindrical members A and B, one of which has a space 8 inside.
One end of the space is open and the other end has a liquid introduction part 4 communicating with the space, and the other cylindrical member B has a liquid outlet part 5 at one end and a cylindrical part in the center. The cylindrical part has a liquid passage inside, one end of which communicates with the liquid outlet part 5 and the other end closed, and a slit 1 communicating with the liquid passage is formed on the side surface of the cylindrical part. The cylindrical part of the cylindrical member B is inserted into the space 8 of the cylindrical member A from the opening, and both members are rotatably fitted into each other. When the cylindrical part of the cylindrical member B is inserted, the internal space gradually expands along the circumference of the side surface of the cylindrical part.
By mutually rotating the cylindrical members A and B, the slit 1 provided in the cylindrical part of the cylindrical member B is formed around the cylindrical part. The gap 2 formed
1. A flow rate regulator, characterized in that the flow rate is adjusted by changing the positional relationship with respect to the flow rate.