Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-01-07
1998-12-22
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604111, 604187, A61M 500
Patent
active
058512004
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a structure and method of sealing a kit-type syringe with a cylinder filled with medicine which has improved sealing property so as to prevent intrusion of flowing water vapor in sterilization and of vacteria in preservation for a long time in a cylinder filled with medicine. The present invention also relates to a sliding valve for a syringe which can be inserted, with no tilt, into the cylinder of a syringe. The present invention further relates to a kit-type syringe having a simple structure which can discharge a medicine liquid through a gap from a sliding valve at a bulging portion of an integral cylinder. These valve and kit-type syringe intend to prevent intrusion of flowing water vapor and vacteria into the syringe.
PRIOR ART
An explanation will be given of the prior art to proposal of the present invention.
In 1969, L. Erberot pointed out a problem of mixing of glass fragment into a medicine liquid. Since then, several serious problems were presented which include coring (phenomenon of cutting rubber pieces) due to piercing of a syringe needle into a rubber stopper for a vial medicine, vacteria pollution in preparation of medicines, etc. In order to obviate these problems, a syringe serving as a vessel, i.e. a medicine kit was developed.
The medicine kit has various merits. For example, the medicine kit, the syringe cylinder of which is filled with a medicine liquid, can prevent mixing of alien substance pollution of vacteria. It can also relax burden of medical workers in preparation of medicine. It is expected to develop increasingly in the future.
The medicine kit used at present can be classified into two structural types.
In the one type, a medicine liquid is put in the conventional cylinder and outside air is shut out by only a cap at a needle connection portion. In the other type, a barrel of plastic is fit in a cylinder body of glass, and a front stopper (or front sliding valve) may shut out the outside air from the medicine liquid.
Generally, laws require that medicines can be preserved for three years. Therefore, the latter type is more preferable than the former type.
Since the inner face of a glass syringe cannot be processed commonly, a syringe composed of a processable barrel of plastic and a cylinder of glass coupled thereto might be an inevitable selection at that time of development.
Recently, the FDA (Food and Drug Administration) in USA required that the kit medicine is sterilized not only before filling of a medicine liquid but also after filling.
However, use of the barrel style syringe gave rise to a problem that flowing water vapor intrudes the barrel in the above post-sterilization.
Thus, the syringe free from intrusion of the flowing water vapor in the post sterilization has become indispensable. In addition, as a premise, it preferable that the syringe has a front stopper as well as a waterproofing cap. Further, the syringe is required to satisfy the following conditions.
A new kit medicine capable of satisfying these conditions has been realized using amorphous polyolefin which has been developed recently. Such a kit medicine has been proposed by the applicant of this application (PCT/JP94/2138).
The details of the above background art will be explained below.
FIG. 29 shows a conventional kit style syringe disclosed in Japanese Patent Publication No. 62-58745.
A syringe 140 permits easy injection by only attachment of a needle in injection, with a cylinder 141 previously filled with a medicine 142. The syringe 140 is composed of a cylinder body 143, a barrel 144 of synthetic resin coupled with the front end thereof, sliding valves 145 (front stopper rubber) and 146 (end stopper rubber or plunger) arranged within the cylinder body 143, a medicine liquid filled between both valves and a cap 148 of synthetic resin mounted so as to cover a syringe needle connection portion 147 at the tip of the barrel 144.
The internal diameter of the barrel 144 is made equal to that of the cylinder body 143. A groove 150 for guiding the m
REFERENCES:
patent: 4475903 (1984-10-01), Stenhuisen et al.
patent: 4929230 (1990-05-01), Pfleger
patent: 5205827 (1993-04-01), Novacek et al.
Higashikawa Tetsuro
Suzuki Hirokazu
Tetsuro Higashikawa
Yasko John D.
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