JPH0657256B2 - Clamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clamp used for adjusting the flow rate of a liquid medicine, blood or the like.

(Prior art and its problems) It is well known that a clamp is attached to the middle of a tube for infusions, blood transfusion sets, and other medical devices in order to adjust the flow rate of the drug solution, blood, etc. flowing through the tube. .

Various types of this clamp have been conventionally known, and a typical example thereof is a roll clamp. This roll clamp is generally composed of a casing and a roll rotatably mounted on the casing, and a tube is sandwiched between the roll peripheral surface and the casing bottom surface with an appropriate inclination. By rolling the roll, the cross-sectional area of the tube is changed and the flow rate of the liquid is adjusted.

However, according to such a clamp, particularly when the tube is made of a flexible plastic, there is a problem that the pressed flow passage cross-sectional area changes with time due to its characteristics, and accordingly, the drip flow rate also changes. . For this reason, some improvements have been attempted in the past, and for example, one in which a groove is formed in the length direction of the bottom portion of the casing to provide relief in the tube thickness direction is proposed and is commercially available. The basic principle of gripping a plastic tube is the same, and it is inevitable that the drip performance will vary due to the characteristics of the plastic tube.

The present invention solves the above problems, and provides a clamp that can adjust a liquid flow rate with high accuracy and stability, and that has a simple structure and can be easily designed and mass-produced. The purpose is to

(Means for Solving the Problems) Means of the present invention adopted for solving the above-mentioned problems include a housing having a liquid inlet portion and a liquid outlet portion, and a shaft portion via a liquid-tight member in the housing. In a clamp for flow rate adjustment, which is equipped with a flow rate adjusting dial in which the outer peripheral surface of the shaft portion and the inner peripheral surface of the housing are slidably contacted and rotated, a tip end surface of the shaft portion of the flow rate adjusting dial and the shaft portion A space for liquid circulation formed between the inner wall of the housing facing the front end surface, and a slit portion formed on the outer peripheral surface of the shaft portion of the flow rate adjusting dial by continuously changing the cross-sectional area in the outer peripheral direction. And a liquid flow passage formed of a shaft portion of the flow rate adjusting dial, the central space portion communicating with the void for liquid circulation, and the liquid flow passage including a through hole communicating with the central space portion and the slit portion, Housing fluid An inlet portion in communication with the gap portion for the liquid flow, to the liquid outlet portion is provided at a position facing the slit portion, and wherein.

(Function) After the liquid flows from the housing inlet into the cavity for the liquid flow path inside the housing, it passes through the central space and through hole of the inflow adjusting dial shaft, and the slit on the shaft outer peripheral surface and the housing inner periphery. It flows out of the liquid outlet through the flow path formed by the surface. The liquid flow rate is adjusted by rotating the flow rate adjusting dial and changing the opening area formed by the slit portion of the shaft portion and the liquid outlet portion.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.
First, FIG. 1 is an overall perspective view of the clamp of the present invention, FIG. 2 is a sectional view, 2 is a housing, and 1 is an adjusting dial.

The shaft portion 3 of the adjusting dial 1 is provided inside the housing 2 as shown in FIG.
While being fitted rotatably so that the outer peripheral surface of the ring slides, the ring-shaped protrusion 4 formed in the intermediate portion of the shaft portion 3,
It is engaged in a ring groove 5 formed in the housing 2, which prevents the adjusting dial 1 from coming out of the housing 2. A seal ring 7 is fitted in the inner surface cutout 6 of the housing 2 to ensure the watertightness of the shaft 3 and the housing 2.

A space 13 is formed between the tip end surface of the shaft portion and the back wall of the housing 2 facing the tip end surface of the shaft portion.

In the central portion of the shaft portion 3 of the adjustment dial 1,
A space portion 8 is formed, a through hole 9 is formed in communication with the space portion 8, and the space portion 8 and the through hole form a liquid flow path. Further, a V slit 10 having a predetermined length is formed on the outer peripheral surface of the shaft portion 3 so as to communicate with the through hole 9.

As shown in the development view of FIG. 4, the V-slit 10 has a shape such that its effective cross-sectional area is gradually narrowed from the through hole 9 toward the tip.

On the other hand, the liquid introducing tube 11 is connected to the inlet 14 of the housing 2, and the liquid outlet tube 12 is connected to the outlet 15.
Are connected. The inlet 14 communicates with the void portion 13, and the outlet 15 is provided at a position corresponding to the V slit 10 of the shaft portion 3.

The adjustment dial 1 and the housing 2 described above are preferably made of injection-moldable plastic.

Next, to explain an example of use of the above-described embodiment, first, a liquid such as a drug solution or blood enters the space 13 of the housing 2 from the introduction tube 11 and the space 8 of the adjusting dial shaft portion 3.
And after passing through the through hole 9, flow along the V slit 10,
It flows from the outlet 15 to the outlet tube 12. This outflow amount depends on the opening area formed by the V slit 10 and the outlet 15. Therefore, when it is desired to rotate the adjustment dial 3 to obtain the maximum flow rate, FIG. 3 and FIG.
As shown in FIG. 5, a portion of the V-slit 10 having a large effective cross-sectional area is aligned with the outlet 15, and in the case of a medium flow rate, as shown in FIG.
Set to 5. Then, when the outflow is stopped, the adjustment dial 1 is further rotated so that the surface of the shaft portion 3 where the V slit 10 is not formed is aligned with the outlet 15 as shown in FIG.

The width, depth, etc. of the V slit 10 are arbitrarily selected so as to obtain a desired flow rate in balance with the opening area of the outlet 15.

(Effect) According to the present invention described above, the amount of liquid outflowing from the housing is directly controlled by adjusting the position of the slit formed on the outer peripheral surface of the shaft portion of the flow rate adjusting dial. Unlike the system in which an elastic body such as a flexible tube is used as a medium, the change in the flow rate over time due to the characteristics of the flexible tube is eliminated, and the fluid flow rate such as infusion or blood transfusion can be maintained with high accuracy throughout.

In addition, it is possible to easily adjust the desired flow rate simply by rotating the flow rate adjusting dial, which eliminates the need for advanced skill and experience.

Furthermore, since the liquid flow rate adjustment depends only on the opening area formed by the liquid outlet section of the housing and the slit section of the flow rate adjusting dial shaft section, it is only necessary to consider the relationship between the liquid outlet section and the slit section when designing. Further, since the structure is relatively simple, it is possible to obtain effects such as mass production at low cost by injection molding or the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view of the same, and FIGS. 3 (a), (b) and (c) are sectional views showing a flow rate adjusting state by a clamp of the present invention. FIG. 4 is a development view of the slit, and shows the position of the liquid outlet corresponding to (a), (b) and (c) in FIG. In the figure, 1 is an adjustment dial, 2 is a housing, 3 is a shaft portion, and 8
Is a space portion, 9 is a through hole, 10 is a V slit, 11 is a liquid introducing tube, 12 is a liquid outlet tube, 13 is a void portion,
14 is a liquid inlet, and 15 is a liquid outlet.

Claims (1)

[Claims] 1. A housing having a liquid inlet portion and a liquid outlet portion, and a shaft portion is fitted into the housing via a liquid-tight member so that an outer peripheral surface of the shaft portion and an inner peripheral surface of the housing are in sliding contact with each other to rotate. In a clamp for adjusting a flow rate including the flow rate adjusting dial, a cavity for liquid flow formed between a tip end surface of a shaft portion of the flow rate adjusting dial and a housing inner wall facing the tip end surface of the shaft portion, A slit portion formed on the outer peripheral surface of the shaft portion of the flow rate adjusting dial by continuously changing the cross-sectional area in the outer peripheral direction, and a slit portion formed on the shaft portion of the flow rate adjusting dial and communicating with the void for liquid circulation. A central space portion, and a liquid flow passage formed of a through hole communicating with the central space portion and the slit portion. The liquid inlet portion of the housing is communicated with the void portion for liquid circulation, and the liquid outlet portion is The slit part A clamp characterized by being provided at a position opposite to.