Special receptacle or package – For a tool – Body treatment
Patent
1995-09-29
1997-04-01
Foster, Jimmy G.
Special receptacle or package
For a tool
Body treatment
206364, 206497, 604197, 604220, B65D 8508, B65D 7500
Patent
active
056157720
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to medication filled syringe equipment that has the barrel filled with a given amount of medication and which can be distributed and stored intact until use.
BACKGROUND ART
Disposable syringe equipment which has a given amount of medication contained in the barrel is used extensively not only for saving the time required to have the medication transferred from an ampule into the barrel before injection but also for eliminating the potential hazard of infection with pathogenic bacteria and viruses due to the repeated use of the equipment.
Syringe equipment of this kind has the following basic construction: a cap is fitted on the needle attaching portion at the foremost end of the barrel and a plunger is inserted into the barrel from the rear end in such a way that a closed space is formed in front of the plunger, with a given amount of medication being contained in that space. Since one only need remove the cap and attach the needle to perform injection, the equipment has the advantage of providing great ease in handling.
The equipment, however, has a problem that originates from its simple construction; it adopts no closing means other than the cap which is detachably fitted on the needle attaching portion, so even if a malicious person ejects a portion of the medication or mixes it with a foreign matter or even replaces it with another medication, there is no way to check these acts as long as the cap is refitted.
A second problem with the equipment comes from the fact that it cannot be sterilized or disinfected just prior to use, which is in sharp contrast with another conventional type of syringe equipment that uses medications in ampules. Under the circumstances, it is necessary that the equipment of interest be distributed and stored in a sterilized atmosphere throughout the period from the filling of the medication in a sterile condition up to the time of actual use; to meet this need, the equipment must be wrapped with airtight packages and handled under strict control, this requiring cumbersome procedures.
To solve the first mentioned problem, the assignee previously proposed that the foremost end portion of the barrel and the cap are covered with a tubular continuous sealing device that is made of a heat-shrinkable film and which shrinks under heat to come into intimate contact with the outer peripheral surfaces of the foremost end portion of the barrel and the base portion of the cap, as well as the shoulder portion of the same (see the official gazette of Unexamined Published Japanese Utility Model Application Hei 3-101960).
According to this proposal, the sealing device prevents unauthorized removal of the cap and the plunger cannot be withdrawn since the medication filled space is closed (in vacuum). This offers the advantage of assuring freedom from anxiety for the user since he can verify that the syringe equipment has been properly sealed until use.
On the other hand, both the interior of the barrel at the basal end and the plunger rod remain exposed and provide areas for deposition of bacteria, viruses, as well as dirt or dust particles. To deal with this problem, the whole part of the syringe equipment must be wrapped with airtight packaging means. Thus, means for solving the aforementioned second problem is yet to be developed.
The sealing device proposed in Unexamined Published Japanese Utility Model Application Hei 3-101960, supra has another problem in that the cap must be shrunk sufficiently to assure strong adhesion to the outer peripheral surface of the barrel so that nobody can perform a misconduct by pulling the sealing device away from the barrel together with the cap and by then refitting it over the barrel. To meet this need, one may apply heat either at high temperatures for a short period or at comparatively low temperatures for a long period but, then, the medication in the barrel can potentially receive adverse thermal effects or the thermal expansion mismatch between the barrel, the plunger and the cap will cause gaps to form bet
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Foster Jimmy G.
Seikagaku Kogyo Kabushiki Kaisha (Seikagaku Corporation)
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