JPH0243394Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a valve body for an air inflow prevention valve. More specifically, the present invention relates to a valve body of an air inflow prevention valve provided as a means for preventing air from flowing into a medicinal solution in a metering tube of an infusion set with a metering tube used for semicontaminated liquid.

<Prior art and problems> Conventionally, when injecting a seminal liquid using an infusion set with a metered-dose tube, air is injected into the patient's vein at the end of drug injection (when the liquid level scale is zero). As a means to prevent the inflow, a plate-shaped valve made of silicone rubber that floats in the drug solution is provided at the outlet of the metering cylinder of the infusion set, and the plate-shaped valve automatically flows when the drug solution injection is finished. Such a plate-shaped valve with an outlet is a so-called float valve, and is housed in an applicable container such as a metering tube, and when there is sufficient chemical liquid inside, it floats in the chemical liquid, and when the chemical liquid runs out, it floats in the liquid. It is constructed so that it descends together with the liquid level and covers the outlet of the chemical solution (which serves as the valve seat of the plate-shaped valve), thereby blocking the outlet. However, with the valve body of the air inflow prevention valve using the plate-shaped valve, the outlet of the metering cylinder is not completely closed at the end of chemical injection, and the plate-shaped valve does not allow the metering to be completed due to the effects of sterilization. This can cause problems such as sticking to the valve seat provided at the outlet of the cylinder and not floating in the chemical solution, or the shape of the plate-shaped valve deforming into a twisted state during transportation, etc., and preventing it from fully fulfilling its function of stopping the liquid. Something happened.

<Purpose of the invention> The purpose of the invention is to completely close the outlet of the metering tube at the end of chemical injection, to prevent the valve from floating in the chemical liquid, and to prevent the shape of the valve from changing during transportation. An object of the present invention is to provide a valve body for an air inflow prevention valve.

<Structure of the idea> The present invention solves the above problems.

That is, the present invention is composed of a plate-shaped valve part and a fixing frame that fixes the valve part at the outer edge of the valve part,
This is a valve body of an air inflow prevention valve, characterized in that a cavity is provided in the fixed frame. The valve portion is preferably made of silicone rubber, and the fixed frame is preferably made of polypropylene or polystyrene.

<Effect of the invention> Since the valve body of the air inflow prevention valve of the present invention has a plate-shaped valve part fixed with a fixed frame, even if the valve part is distorted during molding, it will not appear over time. The distortion that was supposed to be caused is suppressed by the fixed frame. Therefore, the outlet of the metering cylinder can be completely closed.

Similarly, since the plate-shaped valve part is fixed by the fixed frame, even if the valve part is placed in a state where it is twisted due to its own weight during transportation, the deformation force will be absorbed by the fixed frame. It gets absorbed. Therefore, the valve part is not twisted, and the liquid stop function of the valve part can be fully performed.

Furthermore, since the fixed frame of the valve body of this air inflow prevention valve has a hollow part, the valve part may adhere to the valve seat (the outlet of the chemical solution is the valve seat) due to the sterilization process. Even in this case, the large buoyant force of the fixed frame allows the valve portion to be separated from the valve seat.

<Example> Next, a most preferred example of the present invention will be described based on the drawings.

As shown in FIG. 1, the valve body of this air inflow prevention valve is composed of a plate-shaped valve part 1 and a fixing frame 2 that fixes the valve part 1 at the outer edge of the valve part. A hollow portion 3 is provided in the hollow portion 3 . The material for forming the valve part 1 is natural rubber, silicone rubber, butyl rubber,
It is selected from butadiene rubber, butadiene styrene rubber, and other elastomers, with silicone rubber being particularly preferred.

Regarding the shape of the fixed frame, it is preferable to use a translucent frame or a cylindrical one with one end closed. 1 and 2 are preferred embodiments thereof, and other shapes as shown in FIG. 3 are also conceivable. In addition, as shown in FIG. 4, the cavity 3 is formed by the valve part 1 and the fixed frame 2,
This is an improved version of the one shown in Figure 4, in which a filter 4 that is impermeable to chemical liquid but permeable to gas is installed in the fixed frame to prevent the valve part from being deformed by vacuum operation when performing ethylene oxide sterilization as shown in Figure 5. can also be considered.

The material for forming the fixed frame is selected from plastics such as polypropylene, polyethylene, polystyrene, acrylonitrile butadiene resin, and polyester, with polypropylene and polystyrene being more preferred in terms of chemical resistance and cost.

Next, a case will be described in which the valve body of the air inflow prevention valve of the present invention is applied to a drip tube.

As shown in FIG. 6, the valve body V of the air inflow prevention valve of the present invention covers the outlet 6 of the drug solution and blocks it when the drug solution runs out. This prevents the transition to

<Effects of the invention> As is clear from what has been described above, the present invention has the following advantages.

That is, since the valve body of the air inflow prevention valve of the present invention has the valve part fixed by a fixed frame, it does not undergo deformation due to distortion or twisting, and therefore, the valve part can sufficiently perform the liquid stop function. Can be done.

Further, since the fixed frame is provided with a hollow portion, there is no problem that the valve portion does not float in the liquid while remaining attached to the valve seat.

[Brief explanation of the drawing]

FIG. 2 is a plan view of a preferred embodiment of the present invention, and FIG. 1 is a sectional view taken along line A-A' in FIG. 3 to 5 are sectional views of other embodiments, and FIG. 6 is a view showing the state when the valve body of the air inflow prevention valve of the present invention is used in a drip tube. Explanation of main symbols: 1: Valve part, 2: Fixed frame, 3:
cavity.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a plate-shaped valve part and a fixing frame that fixes the valve part at the outer edge of the valve part, and characterized in that the fixing frame is provided with a hollow part. Valve body of air inflow prevention valve. (2) The valve body of the air inflow prevention valve according to claim 1, wherein the valve portion is made of silicone rubber. (3) The valve body of the air inflow prevention valve according to claim 1 or 2, wherein the fixed frame is made of polypropylene or polystyrene.