JPH05329211A - Pressure resistant one-way valve for medical treatment - Google Patents

Abstract

PURPOSE:To obtain the pressure resistant one-way valve for medical treatment of a disposable type which can make perfect sealing from a low pressure to a high pressure by automatically varying the static position of a valve body with the varying degrees of the pressure to be pressurized and executing the low-pressure seal by a soft member in a first stage and the high-pressure seal by a hard member in a second stage. CONSTITUTION:The valve body 3 is energized by a spring 5, by which the valve body 3 is pushed down and an O-ring 4 is kept in light contact. with the inside of a lure. The valve body 3 lifts and the fluid can be run when the fluid pressure of a prescribed level or above is applied in an arrow 7 direction. The valve body 3 is slid downward and the O ring 4 comes into contact with a first contact surface 1a when the low pressure is applied from an arrow 8 direction. The soft seal is thus executed. The valve body 3 slides further downward when the high pressure is applied from an arrow 9 direction. The hard contact surface 3a of the polyacetal resin of the valve body 3 and the hard second contact surface 1b of the male side lure 1 of the polycarbonate, then, come into contact with each other to receive the high pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure resistant one-way valve for medical use, and more particularly to a structure of a disposable one-way valve for medical use.

[0002]

2. Description of the Related Art For example, when injecting a drug solution or a contrast agent into a patient using an injector, suction / pressurization injection of the drug solution is repeated many times by a syringe equipped with a stopcock. Since the other end of the catheter, one end of which is connected to the syringe, is punctured into the patient's artery, etc., a one-way valve is inserted to prevent backflow of blood when aspirating the drug solution. There is a need. In addition to the above, the one-way valve is used in various places in medical treatment, but the description thereof will be omitted. The one-way valve used for medical purposes is ideally a disposable type with a simple structure in order to prevent infection. Therefore, what is currently on the market has a simple structure, mainly a low pressure seal (sealing). Is limited to what is possible.

[0003]

As described above, the conventional medical pressure-resistant one-way valve for medical use is mainly limited to the low-pressure seal, so that its use is limited. Further, the one that is not disposable but has a structure capable of withstanding high pressure has a problem that the low-pressure seal is incomplete this time, and there is no one-way valve for medical use that can seal both high pressure and low pressure as a disposable type.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a disposable type pressure resistant one-way valve for medical use capable of completely sealing from low pressure to high pressure.

[0005]

A medical pressure-resistant one-way valve according to the present invention is a hard valve body formed of, for example, polyacetal resin (POM), which slides and seals in a luer when pressurized. Is made to slide in two stages to perform a two-stage seal, and the first-stage seal is formed by an O-ring using, for example, silicone (Si) rubber as an annular soft seal member and, for example, polycarbonate (PC). By contacting the first contact surface in the hard luer, the O-ring is deformed to seal against low pressure, and the second stage seal is the second contact surface in the luer and the valve body. The structure is such that high pressure sealing is achieved by contact with the contact surface provided on the.

[0006]

In the present invention, the stationary position of the valve main body is automatically varied depending on the pressure applied, and the low pressure sealing by the soft member is performed in the first stage, and the high pressure sealing by the hard member is performed in the second stage. Since this is performed, complete sealing from low pressure to high pressure is possible with a simple structure. For example, by forming the material as described above, it can be inexpensively constructed and a disposable type is obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a broken sectional view showing the structure of the left half of the medical pressure-resistant one-way valve of the present invention. In the figure, 1 is a female luer, 2 is a male luer, 3 is a valve body, and 4 is an annular soft seal member. The O-ring 5 and 5 are springs. The female lure 1 and the male lure 2 are both made of polycarbonate (PC), for example, and are joined together by an adhesive at their adhesive surfaces. The valve body 3 is urged by the spring 5 to push down the valve body 3, and the O-ring 4 is in a state of lightly contacting the inside of the lure. When a fluid pressure of a predetermined level or higher is applied in the direction of arrow 7, the valve body 3 is resisted against the bias of the spring 5.
Is lifted, and the fluid can flow in the direction of arrow 7.

2 and 3 are views for explaining the operation of the apparatus of the present invention. In each drawing, the same reference numerals as those in FIG. 1 indicate the same parts. As shown in FIG. 2, when a low pressure is applied in the direction of the arrow 8, the valve body 3 slides downward due to the urging of the spring 5 and this low pressure.
Comes into contact with the first contact surface 1a. And O-ring 4
Is deformed, and the O-ring 4 is deformed to provide a soft seal, and the pressure applied from the arrow 8 is balanced to maintain a low-pressure seal state.

Next, the hard seal will be described. As shown in FIG. 3, when a high pressure is applied in the direction of arrow 9, the valve body 3 slides a little further downward due to this high pressure. Then, for example, polyacetal resin (POM) of the valve body 3
The hard abutment surface 3a formed by and the hard second abutment surface 1b of the female luer 1 made of polycarbonate (PC) come into contact with each other to receive the high pressure from the direction of the arrow 9 and A hard seal state is maintained by the contact surface 3a and the second contact surface 1b.

As described above, according to the present invention, the valve body, which slides and seals in the lure when pressurized, slides in two stages to perform two-stage sealing, and the first stage The soft seal maintains the sealing state against low pressure due to the deformation of the O-ring due to the contact between the O-ring and the first contact surface 1a, and the second-stage hard seal has the contact surface 3a and the second contact surface 1a. The contact with 1b maintains a high-pressure seal state due to the contact of the hard member, and the problem that the high-pressure seal cannot be achieved in the case of the seal using only the O-ring, and in the seal where only the hard members contact each other. It solves the problem that low-pressure sealing cannot be done completely. With the above-described structure, it is possible to completely seal a high pressure of about 0 to 0.1 kg / cm to a high pressure of 70 kg / cm.

Further, by using polycarbonate as the material of the lure and polyacetal as the material of the valve body, the construction can be made at a low cost and the disposable type can be obtained.

[0012]

As described above, the present invention is effective at 0.1 k
There is an effect that a disposable medical pressure resistant one-way valve capable of completely sealing from a low pressure of g / cm to a high pressure of 70 kg / cm can be obtained.

[Brief description of drawings]

FIG. 1 is a broken cross-sectional view showing the structure of a medical pressure resistant one-way valve of the present invention.

FIG. 2 is a diagram for explaining the operation of the device of the present invention.

FIG. 3 is a diagram for explaining the operation of the device of the present invention.

[Explanation of symbols]

 1 Female Luer 2 Male Luer 3 Valve Body 4 O-Ring 5 Spring 1a First Contact Surface 1b Second Contact Surface 3a Contact Surface

Claims (2)

[Claims] 1. A structure in which a valve body that slides in a lure when pressurized is slid in two stages to perform a two-stage seal, and the first-stage seal is provided on a valve body. The annular soft seal member and the first contact surface provided in the lure contact each other, so that the annular soft seal member is deformed to perform a soft seal against low pressure, and the second stage seal is provided in the valve body. By contacting the contact surface and the second contact surface provided in the lure,
A pressure resistant one-way valve for medical use, characterized in that the second contact surface prevents sliding of the valve body due to high pressure and provides a hard seal. 2. The annular soft seal member is made of silicone rubber, and the lure is made of polycarbonate.
A medical pressure resistant one-way valve, characterized in that the valve body is made of polyacetal resin, the first stage sealing is performed by a soft member, and the second stage is performed by a hard member.