Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-03-27
1997-12-16
McDermott, Corrine M.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604185, A61M 500
Patent
active
056979193
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a portable analgesic system which is attached to a patient's body.
2. Background
Analgesics play an important role in pain control and in cases involving chronic pain. It has heretofore been necessary for a patient to be hospitalized or visit a hospital as an out-patient for a long time.
The need for frequent injection of liquid medicine such as an analgesic or the like is onerous both to a patient and in terms of time and efficiency to a hospital. Consequently, an automatic injection system has been developed which injects liquid medicine to an in-patient periodically and automatically. However, conventional systems are large in size and expensive and physically limit a patient.
Thus, a convenient automatic injection system which is not physically limiting and can be applied to in-patients, out-patients, and home-patients has been desired for a long time.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a portable and convenient analgesic system which is attached to a patient's body and can inject liquid medicine into the patient's body as required by a patient.
In order to achieve the above object, a portable analgesic system comprises: a continuous injector for liquid medicine which discharges liquid medicine continuously for a given period of time; a switch valve connected to an outlet of said injector for shutting off discharge of liquid medicine from said injector; a three-way connector to an outlet of said switch valve and having three ways; a flexible reservoir connected to one way of said three-way connector for storing liquid medicine; and a pressure-check valve connected to another way of said three-way connector for opening a flow passage only when a pressure of liquid medicine in said reservoir rises above a given value.
In the portable analgesic system of the present invention, a continuous injector for liquid medicine which has a given capacity and a given self-maintaining discharge time is prepared beforehand and a given kind and amount of liquid medicine is injected into the injector in compliance with the condition of a patient. Then, the switch valve is opened to transfer liquid medicine to the reservoir for a given period of time. During this transferring period the patient can freely move with the system being attached to one's body.
A period of time for transferring liquid medicine from the injector to the reservoir coincides with a self-maintaining remedy effect time of liquid medicine. When the patient feels pain, the patient compresses the reservoir to inject the liquid medicine contained in the reservoir into one's body through the pressure-check valve.
Preparing for a next pain, the injector can then be supplied with liquid medicine by a licensee at the patient's home or a hospital.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a plan view of a portable analgesic system of the present invention;
FIG. 2 is a longitudinal cross sectional view of the system taken along line II--II in FIG. 1;
FIG. 3 is an explanatory view illustrating an operation of injecting liquid medicine into a continuous injector for liquid medicine;
FIG. 4 is an explanatory view illustrating an operation of transferring the liquid medicine from the injector to a reservoir;
FIG. 5 is an explanatory view of operation at a finished state of transferring of the liquid medicine to the reservoir; and
FIG. 6 is an explanatory view illustrating an operation of ejecting the liquid medicine out of the system upon compressing the reservoir.
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a portable analgesic system of the present invention will be explained below by referring now to FIGS. 1 through 6.
As shown in FIGS. 1 and 2, a portable analgesic system of the present invention comprises: a continuous injector 1 for liquid medicine which discharges liquid medicine continuously for a given period of time; a switch valve 2 connected to an outlet of the injector 1 for shutting off discharge of liquid medicin
REFERENCES:
patent: 3468308 (1969-09-01), Bierman
patent: 5002528 (1991-03-01), Palestrant
patent: 5053012 (1991-10-01), Edwards et al.
patent: 5061243 (1991-10-01), Winchell et al.
patent: 5211632 (1993-05-01), Tsukada
patent: 5360411 (1994-11-01), Mimura et al.
patent: 5439452 (1995-08-01), McCarty
Kinoshita Kodai
Tsukada Osamu
McDermott Corrine M.
Tsukada Medical Research Co., Ltd.
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