Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
2000-04-19
2002-10-22
Casler, Brian L. (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S086000, C604S095030
Reexamination Certificate
active
06468251
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a mixing/charging port for a medical treatment, which is mounted on a medical instrument to make it easy and reliable to mix/charge solutions from the outside of a solution feed passage or, contrarily, to collect the solutions from the inside of the solution feed passage.
BACKGROUND ART
In infusing a liquid medicine or transfusing blood into the vessel of a patient, it is often necessary to provide a main solution feed passage with a side-infusing line in order to mix/charge different kinds of liquid medicines or to collect the liquid flowing in the solution feed passage as a sample. Conventionally, in this case, a solution feed passage of an infusion set provided with a rubber mixing/charging port (cock) for piercing by needles is used and solutions are mixed/charged by piercing the mixing/charging port with an injection needle, etc. However, in the conventional method, when piercing the site other than the predetermined piercing site of the mixing/charging port with the needle, the liquid may leak from the site. Another problem is that the injection needle is contaminated due to a working error, etc. In particular, since the mixing/charging port is not designed to hold an injection needle or a syringe at the mixing/charging port, when a liquid medicine continuously is required to be mixed/charged, it is necessary to provide the mixing/charging port with various means for fixing and holding a luer, etc. to be inserted (“an insertion member” will be referred to hereinafter). Thus, it was inconvenient to use such a mixing/charging port. For example, it was necessary to wind a syringe needle base and the mixing/charging port together heavily with a tape so as to be fixed to each other. For another example, it was necessary to use a dropping prevention instrument for the piercing needle or the syringe as is disclosed in, for example, JP 5-22187 U. Furthermore, when the side-infusing is carried out, it may be possible to use a three-way valve besides the mixing/charging port. However, when the three-way valve is used, it is necessary to select liquid passages by a cock, thus complicating the operation. In addition, there was a risk of wrongly selecting liquid passages.
Therefore, recently, the mixing/charging port capable of holding an insertion member has been considered. An example includes a mixing/charging port equipped with a valve which opens when a male luer located at the tip of a syringe is inserted into the mixing/charging port to push the valve and which closes by itself when the luer is pulled out from the mixing/charging port.
However, in such a mixing/charging port, it is necessary to hold a luer at the mixing/charging port regardless of whether the state in which the valve is inserted (i.e., valve opens) or the state in which the valve is pulled out (i.e., valve closes). Therefore, there are the following various problems. More specifically, first, it is necessary to deepen a luer receiving part of the mixing/charging port. In such a shape, the liquid leaking from the valve is difficult to be removed, thus easily becoming unsanitary. Furthermore, in the mixing/charging port having such a deep luer receiving part, there is a possibility that the liquid begins to be mixed/charged in a state in which the luer is not sufficiently inserted into the valve. In this case, when a small amount of liquid medicine is mixed/charged, it may be impossible to administer an effective amount of liquid medicine. Secondly, the structure of the valve becomes complicated, which may lead to increasing cost. Furthermore, as the structure of the valve is more complicated, failures are more likely to occur.
On the other hand, in the conventional simple-structured mixing/charging port (for example, a mixing/charging port merely equipped with a disc-like valve made of an elastic member having a slit), it was difficult to insert a luer of a syringe into the mixing/charging port. If possible, it was difficult to hold the syringe reliably at the mixing/charging port. This is because the conventional disc-like valve is formed of a material having a large elasticity and has a simple structure in which the thick main body is merely provided with a slit, so that the valve is subjected to large resistance when the luer is inserted into the valve, and the valve is largely deformed when the valve holds the luer. However, if the thickness of the elastic member is reduced or a material having a small elastic material is used in order to reduce the resistance when the luer is inserted, the backflow prevention effect of the valve is lowered, which may cause liquid leaking.
It is an object of the present invention to avoid the above-mentioned problems and to provide a simple-structured mixing/charging port, in which an insertion member is easily inserted; which is capable of reliably holding/fixing the insertion member at the mixing/charging port and of securing a passage (between the insertion member and the mixing/charging port) when the insertion member is connected to the mixing/charging port; and which is capable of closing the valve when the insertion member is not connected, thereby preventing the liquid from leaking.
DISCLOSURE OF INVENTION
In order to attain the above-mentioned objects, a mixing/charging port of the present invention includes a disc-like valve having an insertion hole at the center, a seating for supporting the lower part of the periphery of the valve with the center of the rear surface side of the valve unsupported, a cover for restraining the valve by covering at least the upper part of the periphery of the valve with the center on the front surface side of the valve left uncovered, and an anchor means for anchoring an insertion member to the mixing/charging port by using the edge of the cover which inserts an insertion member into an insertion hole and on which a fitting hole is formed.
According to such a configuration, the length between the insertion member, for example, a luer etc. and the valve can be shortened, and it is possible to easily and reliably disinfect, if necessary, the disc-like valve before and after use. Furthermore, it is advantageous that since the structure is relatively simple, the defective fraction is small and few failures occur.
Furthermore, it is preferable in the mixing/charging port for medical treatment of the present invention that at least two projecting parts are formed on the side surface of the seating and at least two notches engaging the projecting parts are formed on the cover. According to such a configuration, the main body of the mixing/charging port for medical treatment can be fixed reliably to the cover. Moreover, since a solvent such as adhesives etc. is not used when fixing, it is possible to exclude the possibility that the adhesives, etc. may elute into the liquid to be injected or collected.
Furthermore, it is preferable that the mixing/charging port for medical treatment of the present invention further includes a recess part where the valve and the cover can be put in and joined with each other. According to such a configuration, it is possible to anchor the main body of the mixing/charging port reliably to the cover, and also possible to reduce a dead space formed between the bottom surface of the disc-like valve and the passage. The “dead space” herein denotes the space generated between the upper end of the passage and the bottom surface of the disc-like valve.
Furthermore, it is preferable in the mixing/charging port for medical treatment of the present invention that the cover further has a gentle taper on the front surface side. Providing a taper makes it possible to induce the insertion member, for example, a luer, etc. into a fitting hole easily, as well as to wipe out a residual liquid, or to disinfect the mixing/charging port by using an alcohol-impregnated cotton, etc., easily and reliably.
Furthermore, it is desirable in the mixing/charging port for medical treatment of the present invention that a dead space formed between the bottom surface of the valve and the upp
Fujii Ryoji
Okiyama Tadashi
Yamanaka Syuichi
Casler Brian L.
Han Mark K.
Jims Co., Ltd.
Merchant & Gould P,C,
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